A gondola car side door correction device

Abstract

The present application relates to the technical field of railway transportation, and discloses a side opening door correction device for an open wagon, which comprises a correction tool and a transmission device, and the correction tool and the production line are connected through the transmission device; the correction tool comprises a frame body; the frame body is provided with two curved portions on the left side and the right side of the upper portion; movable movable pads are movably connected below the curved portions; a plurality of correction oil cylinders are arranged on the lower portion of the frame body; the transmission device is fixedly connected to the middle portion of the frame body and is used for horizontally conveying the side opening door between the movable pads and the correction oil cylinders; the movable pads are used for limiting the upward movement of the side opening door conveyed therebelow; and the correction oil cylinders are used for lifting the side opening door located thereabove to correct the deformation position of the side opening door; after the correction tool is connected to the transmission device, the transmission device can be connected to the production line, the production line fusion is realized, the universality of the correction device is improved, the operation is simple, the practicality is high, and the side opening door correction device has good popularization value and application scenarios.

Description

Technical Field

[0001] This invention relates to the field of railway transportation technology, and specifically to a side-opening door correction device for open wagons. Background Technology

[0002] Open wagons are a type of railway freight car, characterized by being uncovered with four side panels, two of which have fold-down side doors for easy unloading. They are primarily used for transporting bulk goods such as coal, ore, mining materials, timber, and steel, and can also be used to transport lighter machinery. Therefore, open wagons are highly versatile and constitute the largest number of freight cars in China, totaling approximately 300,000 nationwide, accounting for over 50% of all freight cars.

[0003] However, during the manufacturing process of the side-opening doors of convertibles, the welded joints may deform, and the deformed structure is generally semi-circular. There are two existing technologies to address this problem: one is to use flame heating to perform thermal correction after the side-opening door is installed on the vehicle; the other is to perform mechanical correction of the side-opening door on hydraulic equipment (such as a four-column press) before it is installed on the vehicle after production.

[0004] Flame heating straightening is a common method for metal surface treatment. Based on the thermal expansion and contraction properties of metals, it corrects deformed metals by locally heating them with a flame. For example, when there are depressions or protrusions on the metal surface, the protruding parts can be heated with a flame to cause thermal expansion, and then cooled to cause contraction, thus achieving the straightening effect. The advantages of this method are its simple equipment; for example, an oxygen-acetylene cylinder can be connected to a flame nozzle via a hose. It does not require specialized large-scale mechanized equipment, making it convenient, flexible, and low-cost. The disadvantages are that it requires a high level of operator experience and skill; the straightening process requires the operator to make judgments based on experience, resulting in a high safety risk at the operating site. Furthermore, after heat treatment, the internal structure of the metal will change accordingly, leading to a decrease in the mechanical properties of the material in the heated area.

[0005] Hydraulic equipment straightening achieves deformation correction by pressing metal sheets. For example, a deformed door panel is fed onto a door panel forming hydraulic press mold, and after applying a certain pressure, the door panel and other metal sheets can be quickly formed in one go, with fully automated operation. However, this method has disadvantages: for large-sized car doors, it requires hydraulic equipment with a large worktable, which is too expensive and requires a large investment; the equipment is fixed and lacks flexibility, making it impossible to integrate the equipment with the production line; loading and unloading workpieces requires dedicated lifting equipment, and straightening requires crane operators and other personnel, which is labor-intensive, time-consuming, inefficient, and lacks versatility; existing hydraulic equipment, considering hydraulic pressure limiting braking and convenient pipe laying, mostly uses inverted cylinders, that is, the cylinders are installed above the worktable, which has the disadvantage of oil leakage and product contamination. Summary of the Invention

[0006] The present invention aims to provide a side-opening door correction device for open wagons, which solves the technical problems of existing side-opening door correction methods, such as low versatility, inconvenience in production line layout, troublesome loading and unloading operations, inability to guarantee correction accuracy, complex structure, and high cost.

[0007] The basic solution provided by this invention is as follows: a side-opening door correction device for open wagons, including a correction fixture and a transmission device, wherein the correction fixture and the production line are connected by the transmission device; the correction fixture includes a frame; the upper left and right sides of the frame have two opposing curved sections; a movable pad that can move left and right is movably connected below the curved sections; a plurality of correction cylinders are provided at the lower part of the frame; the transmission device is fixedly connected to the middle of the frame and is used to horizontally convey the side-opening door between the movable pad and the correction cylinders, the movable pad is used to limit the upward movement of the side-opening door conveyed below it, and the correction cylinder is used to align with the deformed part of the side-opening door conveyed above it and lift the deformed part to apply a force opposite to the direction of deformation for correction.

[0008] The working principle and advantages of this invention are as follows: the movable pads on both sides move towards the center. After the side door is conveyed to the correction fixture by the transmission device, the side door is located between the movable pads and the correction cylinder. The correction cylinder located below the side door is aligned with the deformed part of the side door. The correction cylinder is activated, and the upward lifting force of the correction cylinder is applied to the deformed part, so that the deformed part produces a deformation opposite to the original deformation direction, thus completing the correction of the side door. During this process, since the movable pads are located above the side door, they limit the upward movement of the side door, ensuring that the upward lifting force of the correction cylinder is effectively applied to the deformed part of the side door. At the same time, due to the increase of the movable pads, the upward lifting stroke of the correction cylinder during the correction process can be effectively reduced, reducing cylinder oil consumption and lowering costs.

[0009] The entire calibration fixture has a simple structure and easy component connection, which improves its versatility. After the calibration fixture is connected to the transmission device, it can be connected to the production line through the transmission device to achieve production line integration and improve the versatility of the calibration device. At the same time, after the side-opening door is produced, it can be directly sent to the calibration fixture for calibration through the transmission device, which reduces the labor intensity of loading and unloading in the calibration process. It is simple to operate, highly practical, and has good promotion value and application scenarios.

[0010] Furthermore, a reset cylinder is horizontally installed at the outer end of the movable pad away from the frame; the movable pad is fixedly installed on the telescopic end of the reset cylinder, and is used to drive the movable pad to move left and right between the extension limit and the retraction limit under the extension and retraction of the reset cylinder; a cylinder seat plate is fixedly installed on the outer side of the curved part; the reset cylinder is fixedly installed below the cylinder seat plate; a slidable bearing is built into the bottom surface of the curved part facing the movable pad; the bearing is fixedly connected to the movable pad, and is used to cooperate with the reset cylinder to drive the movable pad to move left and right.

[0011] Beneficial effects: By fixing the reset cylinder to the movable pad, the movable pad can be moved left and right by the extension and retraction of the reset cylinder. At the same time, a bearing is added above the movable pad and fixedly connected to the movable pad. On the one hand, it can share the weight of the movable pad borne by the reset cylinder, and on the other hand, it makes the left and right movement of the movable pad smoother and faster.

[0012] Furthermore, the movable pad is located above the side-opening door and has a first vertical distance from the side-opening door; the first distance is 10mm.

[0013] Beneficial effects: It provides a buffer space when the correction cylinder lifts the side-opening door upward. This distance can meet the working stroke of the correction cylinder. At the same time, after repeated testing, this distance can make the correction result more likely to meet the correction requirements on the first try.

[0014] Furthermore, a positioning baffle is fixedly installed on the rear surface of the movable pad; the vertical downward length of the positioning baffle exceeds that of the movable pad, and is used to limit the forward movement of the side-opening door that is transmitted to the underside of the movable pad by blocking its forward movement.

[0015] Beneficial effects: Since the positions of the deformed parts in the same batch are relatively fixed on the side-opening doors, adding a positioning baffle can achieve uniform positioning of the side-opening doors in the batch. This ensures that when performing batch correction, with the position of the correction cylinder fixed, the side-opening doors in this batch will stop uniformly at the positioning baffle, and the deformed positions can be aligned with the correction cylinder. There is no need to repeatedly adjust the position of the side-opening doors to align the deformed parts with the correction cylinder, thus ensuring batch correction accuracy and processing speed.

[0016] Furthermore, the distance by which the positioning baffle extends beyond the movable pad is the second distance; the second distance is 10cm.

[0017] Beneficial effects: The positioning baffle is set according to the device and the thickness of the side-opening door to ensure that it can effectively block the side-opening door.

[0018] Furthermore, the distance between the extension limits of the two movable pads is less than the horizontal width of the side-opening door; the distance between the retraction limits of the two movable pads is greater than the horizontal width of the side-opening door.

[0019] Beneficial effects: Because the movable pad has a positioning baffle, its extension limit must meet certain size requirements in order to effectively block the side door when it is in the extension limit and not block the side door from passing through the calibration fixture to the next process when it is in the retraction limit, thus achieving smooth conveying of side doors for batch calibration.

[0020] Furthermore, the initial distance between the correction cylinder and the side-opening door located above it is 50mm.

[0021] Beneficial effects: Maintaining a safe distance between the calibration cylinder and the side-opening door to be calibrated, ensuring that batches of side-opening doors can be smoothly conveyed and passed above the calibration cylinder.

[0022] Furthermore, the position of the correction cylinder can be moved left and right.

[0023] Beneficial effects: By correcting the movement of the hydraulic cylinder position, the alignment accuracy with the deformed part of the upper side-opening door is adjusted, thereby improving the machining accuracy.

[0024] Furthermore, the extension and retraction end of the correction cylinder is fixedly connected to a cylinder top.

[0025] Beneficial effects: By using the hydraulic cylinder head, the deformed parts can be made into full contact, ensuring that the deformation is corrected in one ejection, thus improving processing efficiency.

[0026] Furthermore, a snap-on gasket cover is movably installed on the top of the cylinder.

[0027] Beneficial effects: Since the deformed parts of the side-opening doors vary in size from batch to batch, this method avoids the tedious process of adjusting the stroke of the calibration cylinder for each batch. Without adjusting the working stroke of the calibration cylinder, the stroke of the calibration cylinder can be slightly adjusted by adding a gasket to ensure machining accuracy. Attached Figure Description

[0028] Figure 1 This is a front view of a convertible side door correction device provided in an embodiment of the present invention.

[0029] Figure 2 This is a top view of a convertible side door correction device provided in an embodiment of the present invention.

[0030] Figure 3 This is a left view of a convertible side door correction device provided in an embodiment of the present invention. Detailed Implementation

[0031] The following detailed explanation illustrates the specific implementation methods:

[0032] The markings in the accompanying drawings include: 1. Correction fixture; 2. Transmission device; 11. Frame; 12. Bending part; 3. Movable pad; 4. Side door; 5. Positioning baffle; 6. Reset cylinder; 7. Cylinder seat plate; 8. Bearing; 9. Correction cylinder; 10. Cylinder top; 13. Limit switch.

[0033] Example 1

[0034] To better illustrate this plan, we will first define directions. In this plan, up, down, left, and right refer to the direction of sight. Figure 1 Based on conventional understanding of up, down, left, and right; the forward direction described in this scheme is the direction extending from the end of the transmission device 2 away from the calibration fixture 1 towards the calibration fixture 1, such as... Figure 2 The direction indicated by the arrow.

[0035] like Figure 1 As shown: A side-opening door correction device for open wagons includes a correction fixture 1 and a transmission device 2, which connects the correction fixture to the production line. The correction fixture 1 includes a frame 11. The upper left and right sides of the frame 11 have two opposing curved sections 12. A movable pad 3 that can move left and right is movably connected below the curved sections 12. Several correction cylinders 9 are provided at the lower part of the frame 11. The transmission device 2 is fixedly connected to the middle of the frame 11 and is used to horizontally convey the side-opening door 4 between the movable pad 3 and the correction cylinders 9. The movable pad 3 is used to limit the upward movement of the side-opening door 4 conveyed below it. The correction cylinders 9 are used to align with the deformed part of the side-opening door 4 conveyed above them and lift the deformed part to apply a force opposite to the direction of deformation for correction.

[0036] like Figure 1 As shown, a reset cylinder 6 is horizontally mounted on the outer end of the movable pad 3 away from the frame. The reset cylinder 6 is fixed below the cylinder seat plate 7, which is welded to the outside of the bent portion 12. The movable pad 3 is fixedly mounted on the telescopic end of the reset cylinder 6. In this embodiment, a pin connection is achieved through a semi-smooth round pin. A slidable bearing 8 is built into the bottom surface of the bent portion 12 opposite to the movable pad 3 and is fixedly connected to it. In this embodiment, it is fixed by welding. The reset cylinder 6 and the movable pad 3 are at the same horizontal position. As the reset cylinder 6 extends and retracts left and right, the movable pad 3 moves left and right. The slidable bearing 8 is connected above the movable pad 3. When the movable pad 3 moves left and right, it drives the bearing 8 to roll, making the movement of the movable pad 3 smoother.

[0037] A positioning baffle 5 is welded and fixedly installed on the rear surface of the movable pad 3. The vertical downward length of the positioning baffle 5 exceeds that of the movable pad 3, thereby limiting the forward transmission of the side door 4 by blocking its forward movement. That is, the side door 4 is initially located at the end of the transmission device 2 away from the correction fixture 1, and is transmitted to the correction fixture 1 through the transmission device 2 in the forward direction. Specifically, it is transmitted to the area below the movable pad 3, touches the positioning baffle 5, and stops and is positioned, no longer moving forward, waiting for correction. The distance of the positioning baffle 5 beyond the movable pad 3 is the first distance. In this embodiment, the first distance is 10cm, which exceeds the distance between the movable pad 3 and the side door plus half the thickness of the door, thus effectively blocking the door.

[0038] Specifically, before the first side-opening door reaches the calibration fixture, the reset cylinders 6 of the two movable pads 3 are activated. Under the push of their respective reset cylinders 6, the two movable pads 3 move towards the middle and stop after reaching the extension limit of the reset cylinder 6, waiting for the side-opening door 4 to touch the positioning baffle 5. The distance between the extension limits of the two movable pads is less than the horizontal width of the side-opening door, thus effectively blocking the side-opening door.

[0039] When the first side-opening door is conveyed from the transmission device 2 to between the movable pad 3 and the correction cylinder 9, and simultaneously touches the positioning block 5, it stops moving, completing the positioning of the side-opening door 4. At this time, the movable pad 3 is positioned above the side-opening door 4, with a second vertical distance from the side-opening door 4. In this embodiment, the second distance is 10mm. At the same time, the side-opening door 4 is further secured using the hook next to the positioning block 5.

[0040] The correction cylinder 9 lifts the side door above it to correct the deformed parts. After the first side door is corrected, the two movable pads 3 are pushed back to the sides by their respective reset cylinders 6 and stop after reaching the retraction limit. The distance between the retraction limits of the two movable pads is greater than the horizontal width of the side door, so as not to prevent the corrected side door from passing smoothly on the correction fixture.

[0041] After the first calibrated side door successfully passes through the calibration fixture, the two movable pads 3 extend again towards the center under the push of their respective reset cylinders 6, and stop after reaching the extension limit, waiting for the next side door to touch the positioning baffle, and the calibration and positioning of the next side door is completed in the same way as above.

[0042] The lower part of the frame 11 is equipped with several correction cylinders 9, which are piston-type structures used to lift the side-opening door 4 located above it for correction of deformed parts. Since the side-opening door 4 needs to move and pass over the correction cylinders 9, a certain safety distance needs to be maintained. In this embodiment, the initial distance between the correction cylinder and the side-opening door above it is 50mm. The correction cylinders 9 can move left and right. When the first side-opening door is conveyed to the correction cylinder 9 and limited by the positioning baffle 5, the position of the correction cylinder 9 is adjusted left and right to be directly below the deformed part of the side-opening door 4, aligned with the deformed part. After the position of the correction cylinder 9 is determined, the body is fixed to ensure that the cylinder is stable during correction and does not shift, thus ensuring correction accuracy. In this embodiment, two correction cylinders are set according to the two welded areas of the side-opening door that are prone to deformation and need correction, and are moved by the operator. In other embodiments, a slide and corresponding fixing device can be set at the lower end of the correction cylinder 9. The correction cylinder 9 is positioned by moving left and right through the slide, and then stabilized and limited by the fixing device to complete the positioning of the correction cylinder.

[0043] Multiple calibration cylinders 9 are electrically connected to achieve linkage, ensuring consistency in start-stop and stroke control operations. After the calibration cylinders 9 are positioned, during calibration, the side door 4 is located between the calibration cylinder 9 and the movable pad 3. The calibration cylinder 9 is activated, pushing the side door 4 upward. The movable pad 3 limits the upward movement of the side door 4, and the deformed part of the side door 4 is subjected to vertical clamping forces, causing the deformed part of the side door 4 to undergo a reverse deformation opposite to the original deformation direction, thus completing the calibration.

[0044] The extension end of the correction cylinder 9 is fixedly connected to a cylinder top 10, which is used to directly contact the deformed part of the side-opening door. The cylinder top 10 has a horizontal surface of a certain area, so that the deformed part can contact the cylinder top as a whole, ensuring that the correction cylinder pushes out once and acts on the entire deformed part, and the correction is completed in one go. The deformation limit of all deformation points applied to the deformed part is consistent, ensuring the accuracy of the final correction result.

[0045] An electrical limit switch 13 is installed on the top of the hydraulic cylinder to control the limit stroke of the cylinder top, thereby controlling the amount of deformation during side-opening door correction. This ensures the corrected deformation is within acceptable limits while preventing excessive correction that could damage the product. In this embodiment, the limit stroke is 150mm, used when upward lifting is required.

[0046] When the calibrating cylinder 9 pushes the side door upward, the movable pad 3 limits the upward movement of the side door 4 from above, thus reducing the upward stroke of the calibrating cylinder 9 and saving cylinder costs.

[0047] like Figure 2 , Figure 3As shown, the transmission device 2 is welded to the middle of the frame 11 and located below the movable pad 3, so that after the side door 4 is horizontally conveyed to the movable pad 3 and the correction cylinder 9 on the correction fixture 1 through the transmission device 2, the movable pad 3 and the side door 4 have a certain buffer distance; since the transmission device 2 and the correction fixture 1 are connected together, the side door 4 is always on the transmission device 2 from the time it is conveyed to the time it is corrected.

[0048] This solution connects the calibration fixture to the transmission device and also enables production line connection. Specifically, one end of the calibration fixture is connected to the transmission device, while the other end of the transmission device can be near the first-process conveyor table of the production line, and the other end of the calibration fixture can be near the second-process conveyor table. The entire side-opening door transmission line remains horizontal. Thus, the side-opening door can be directly transported from the first-process conveyor table to the calibration fixture via the transmission device of this solution. After calibration, the side-opening door is directly moved and transported to the second-process operating table, achieving connection between the calibration device and the production line and avoiding the separate loading and unloading operations required for the side-opening door calibration process. In this embodiment, the existing transmission device, including a roller conveyor frame and conveyor rollers, is utilized. The side-opening door is manually moved and transported using the rollers, saving time and labor. In other embodiments, the transmission device also includes a conveyor motor and a chain. The conveyor motor is mounted on the roller conveyor frame and drives the conveyor rollers through the chain to complete the function of transporting the side-opening door. After the side-opening door is calibrated and positioned, the conveyor motor is stopped, the conveyor rollers stop operating, and the transport of other side-opening doors ceases.

[0049] In actual production, the length and direction of the conveyor rollers can be set according to production needs, offering high flexibility. Typically, the conveyor rollers are in a unit group mode, adopting a modular design that is easy to assemble, disassemble, and maintain. They can meet the requirements of horizontal, vertical, and inclined conveying, and their height and direction can be flexibly adjusted to follow changes in the position and height of the production line's operating table exit end, making them suitable for a wide range of applications.

[0050] Therefore, this solution utilizes a flexible and versatile transmission device to connect the calibration fixture and the production line, enabling the calibration device to be adapted to different production lines and achieving high versatility.

[0051] Example 2

[0052] Unlike Embodiment 1, a snap-on cover is movably installed on the cylinder top 10. The cover can snap onto the cylinder top 10 and is used to adjust the stroke of the calibration cylinder 9. Specifically, the position of the deformed part of the side-opening door 4 is basically fixed, and the size of the deformed part of the side-opening door 4 in the same batch is basically the same. However, the size of the deformed part of the side-opening door 4 in different batches is different, with the deformation size generally ranging from 10 to 16 mm. Under normal circumstances, the working stroke of the calibration cylinder 9 is fixed and less than the limit stroke. The working stroke of the calibration cylinder 9 will not be adjusted due to the different sizes of the deformed parts in different batches of the side-opening door 4, which would be cumbersome. Therefore, by using covers of different heights to adjust the stroke difference of the calibration cylinder 9 caused by the different sizes of the deformed parts in different batches, both calibration accuracy and convenient adjustment are ensured.

[0053] The height of the shim is determined through trial calibration before batch calibration. Specifically, at least one trial calibration is performed on the side-opening doors 4 in this batch before batch calibration. The trial calibration process is as follows: First, the first side-opening door 4 in this batch is transferred to the calibration fixture 1 for positioning. The calibration cylinder 9 is moved to directly below the deformed part of the side-opening door 4. Without adding a shim, the calibration cylinder 9 is activated to perform an upward jacking calibration. After calibration, the height of the protrusion at the deformed part is checked with a straightedge. If it does not exceed 3mm, the calibration is considered qualified, and the trial calibration ends. The position of the calibration cylinder 9 remains unchanged, and no shim is added. The calibration of all remaining side-opening doors 4 in this batch is then completed. If the height of the protrusion exceeds 3mm, the calibration is considered unqualified. Based on the difference in size, a shim of appropriate height is selected. For example, if the size difference is 5mm, a 2mm high shim is selected and clipped onto the top of the cylinder 10. Calibration is performed again. If the height of the protrusion does not exceed 3mm, the calibration is considered qualified, and the trial calibration ends. The position of the calibration cylinder 9 remains unchanged, and the added shim is used to complete the calibration of all remaining side-opening doors 4 in this batch. In this embodiment, the pad cover comes in three models with heights of 2mm, 4mm, and 6mm, which can meet the current production calibration needs.

[0054] This invention features simple components, a compact structure, and low investment costs. The calibration fixture and transmission device are flexibly connected and easily moved, facilitating integration with production lines to meet line design requirements. It overcomes the technical challenge of traditional calibration devices that can only be used independently for loading and unloading operations and cannot be connected to production lines. The movable pads provide positioning for two types of side-opening doors, expanding the applicability of the calibration device. The transmission device connects the calibration fixture to the production line, allowing the side-opening door to be transported to the calibration fixture via the production line and transmission device, reducing the need for equipment hoisting or manual handling during side-opening door calibration, saving time and labor. The electrical limit control of the calibration cylinder controls the stroke of the cylinder head. While ensuring the amount of deformation correction is guaranteed, it also prevents over-correction and damage to the side-opening door. After trial calibration, no manual judgment or intervention is required during batch correction. There are no special requirements for the operator's skills and experience. Only equipment operation training and correction result inspection are required for independent operation. The hydraulic cylinder works stably, with high correction efficiency and quality. At the same time, it breaks through the conventional inverted setting method in this field, changing the correction cylinder to upright installation, reducing the probability of oil leakage. Since the cylinder is located below the side-opening door to be corrected, even if leakage occurs, it will not contaminate the product. The correction accuracy is high and the safety is strong. The mechanical correction method has little impact on the mechanical properties of the product material.

[0055] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics of the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent.

Claims

1. A side-opening door correction device for a convertible, characterized in that, The system includes a calibration fixture and a transmission device, which connects the calibration fixture to the production line. The calibration fixture includes a frame with two opposing bends on the upper left and right sides. A movable pad that can move left and right is movably connected below the bends. Several calibration cylinders are provided at the lower part of the frame. The transmission device is fixedly connected to the middle of the frame and is used to horizontally convey the side-opening door between the movable pad and the calibration cylinder. The movable pad is used to limit the upward movement of the side-opening door conveyed below it and reduce the upward lifting stroke of the calibration cylinder during the calibration process. The calibration cylinder is used to align with the deformed part of the side-opening door conveyed above it and lift the deformed part to apply a force opposite to the direction of deformation for correction. The position of the calibration cylinder is adjusted so that it is located directly below the deformed part of the side-opening door and aligned with the deformed part. A positioning baffle is fixedly installed on the rear surface of the movable pad; the vertical downward length of the positioning baffle exceeds the movable pad and is used to limit the forward movement of the side-opening door conveyed to the bottom of the movable pad, so as to achieve uniform positioning of a batch of side-opening doors. The movable pad is located above the side door and has a first vertical distance from the side door, providing a buffer space when the correction cylinder pushes the side door upward.

2. The convertible side door correction device according to claim 1, characterized in that, A reset cylinder is horizontally installed at the outer end of the movable pad away from the frame; the movable pad is fixedly installed on the telescopic end of the reset cylinder, and is used to drive the movable pad to move left and right between the extension limit and the retraction limit under the extension and retraction of the reset cylinder; a cylinder seat plate is fixedly installed on the outer side of the curved part; the reset cylinder is fixedly installed below the cylinder seat plate; a slidable bearing is built into the bottom surface of the curved part facing the movable pad; the bearing is fixedly connected to the movable pad, and is used to cooperate with the reset cylinder to drive the movable pad to move left and right.

3. The convertible side door correction device according to claim 1, characterized in that, The first distance is 10mm.

4. The convertible side door correction device according to claim 1, characterized in that, The distance by which the positioning baffle extends beyond the movable pad is the second distance; the second distance is 10cm.

5. A convertible side door correction device according to claim 4, characterized in that, The distance between the extension limits of the two movable pads is less than the horizontal width of the side-opening door; the distance between the retraction limits of the two movable pads is greater than the horizontal width of the side-opening door.

6. The convertible side door correction device according to claim 1, characterized in that, The initial distance between the correction cylinder and the side door located above it is 50mm.

7. The convertible side door correction device according to claim 1, characterized in that, The position of the calibration cylinder can be moved left and right.

8. A side-opening door correction device for a convertible according to claim 1, characterized in that, The extension and retraction end of the correction cylinder is fixedly connected to the cylinder top.

9. A side-opening door correction device for a convertible according to claim 8, characterized in that, A snap-on gasket cover is movably installed on the top of the hydraulic cylinder.

Images