A quick roll changing method for a cold straightening machine

Abstract

The application provides a kind of cold straightener quick roll changing method, after shutdown, roll gap is opened to maximum, complete parameter reset and mode pre-setting;Supporting block is placed between upper and lower roll box, pipeline and detection element connector are removed in turn;Roll changing state and operation authority are switched through local operation panel, lower roll box lifting pre-positioning, upper roll box drop support and locking device release are completed;Universal shaft is lifted to zero and clamped brake;Old roll box is removed by roll changing trolley and new roll box is sent in, upper beam is locked and reset in the order of first down and then up;Each connector is reloaded, automatic mode and remote control are restored, after no-load test, it is put into production.The application shortens single roll changing downtime from 4 to 6 hours to less than 1 hour through whole-process standardized operation and interlocking logic design, effectively avoids roll surface and transmission component collision damage, improves new roll box installation alignment accuracy, significantly improves production efficiency and operation safety, and is suitable for various multi-roll cold straighteners.

Description

Technical Field

[0001] This invention relates to the field of metallurgical plate straightening equipment technology, and in particular to a method for quick roller changing in a cold straightening machine. Background Technology

[0002] In the production process of medium and heavy plate steel, the cold straightener is the core equipment for improving the shape of the plate and eliminating internal stress. Through the alternating bending action of multiple sets of straightening rollers, the plate undergoes elasto-plastic deformation, ultimately obtaining a finished plate with acceptable straightness. As the core working component of the cold straightener, the straightening rollers are in constant contact and friction with the plate, making them prone to wear, scratches, and deformation. Regular replacement is necessary to ensure straightening quality. The straightening rollers of a cold straightener are typically replaced as a whole, with the roller box as the unit. Roller replacement is a crucial part of the daily maintenance of the cold straightener.

[0003] In existing technologies, roll changing operations on cold straighteners generally suffer from problems such as non-standardized operating procedures, cumbersome steps, and frequent mode switching. Traditional roll changing processes require operators to repeatedly travel between the main control room HMI screen, the machine-side control panel, and the equipment site, repeatedly switching modes and adjusting parameters. A single roll changing operation typically results in downtime of 4-6 hours, severely impacting production line utilization and efficiency. Furthermore, traditional roll changing processes lack standardized operating sequences and interlocking logic. The order of operations, such as removing the roll box connecting components, pre-positioning and locking the roll box, and moving the roll changing trolley in and out, varies from person to person, easily leading to misoperation that causes damage to the straightening roll surface, universal joint collisions, hydraulic line leaks, and other equipment malfunctions, posing significant safety risks.

[0004] In addition, the traditional roller changing process does not have standardized design for the pre-positioning and support protection of the roller box, resulting in poor alignment accuracy after the new roller box is installed. It requires a lot of extra time for debugging and calibration, which further prolongs the downtime.

[0005] Therefore, developing a standardized, efficient, safe, and reliable method for rapid roll changing in cold straighteners has become a pressing technical problem to be solved in this field.

[0006] Therefore, it is necessary to propose a rapid roll changing method for cold straighteners to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0007] The main objective of this invention is to provide a rapid roll changing method for cold straighteners, in order to solve the technical problems in the prior art where the various operational steps in roll changing of cold straighteners lack standardized sequence and interlock protection, resulting in long downtime for roll changing, easy damage to the roll surface and transmission components, and poor alignment accuracy of the new roll box installation.

[0008] To achieve the above objectives, the present invention provides a method for rapid roll changing in a cold straightening machine, comprising the following steps: S1. After confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the cold straightener drive motor. Open the cold straightener roll gap to the maximum position. In the HMI operation screen, complete the straightening parameter reset, control mode shutdown and roll change mode preset, and switch the cold straightener from remote control mode to local control mode. S2, A support block is placed between the upper roller box and the lower roller box of the cold straightening machine, so that the support block is located below the landing path of the upper roller box, which is used to support the upper roller box and form a mechanical limit protection during the subsequent roller change process. S3. After confirming that the hydraulic system, lubrication system and compressed air system have been depressurized, disconnect the hydraulic pipeline, lubrication pipeline and compressed air pipeline connected to the roller box to be replaced, and disconnect the vibrator connection and lower roller position detection connection connected to the lower roller box, so that the roller box to be replaced is disconnected from the external medium pipeline, vibration component and detection component. S4, switch to the roll changing operation state through the local operation panel of the cold straightener, first lift the lower roll box to move out of the preset position, then control the upper roll box to descend and fall onto the support block, then move the upper crossbeam to the avoidance position, and release the locking device of the upper roll box and the lower roll box. S5, control the universal joint of the cold straightening machine to be raised to the preset disengagement position through the local operation panel, and clamp and brake the universal joint to disengage the universal joint from the transmission end of the roller box to be replaced and keep it locked. S6. After confirming that the locking device is released and the universal joint remains locked, drive the roller changing trolley to move the old roller box out of the cold straightening machine stand, hoist the new roller box to the positioning and bearing position of the roller changing trolley, and then drive the roller changing trolley in the reverse direction to send the new roller box into the preset installation position inside the cold straightening machine stand. S7. Lock and position the new roller box after it is fed in, reset and lock the upper crossbeam, reinstall the hydraulic pipeline, lubrication pipeline, compressed air pipeline, vibrator connector and lower roller position detection connector, release the clamping brake of the universal joint and make the universal joint mesh with the transmission end of the new roller box, restore the cold straightener to the remote control state, and perform a no-load operation test. After confirming that the cold straightener is running normally, the roller change is completed.

[0009] Preferably, step S1 includes the following steps: S11. After confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the cold straightener drive motor. S12, the cold straightener roll gap is opened to the maximum position via the HMI operation screen; S13, in the HMI operation screen, set the AGC parameter to 120, set both the upper and lower wedge parameters to 0, switch the fully automatic mode, upper adjustment system, balance system, AGC system and lower wedge AGC system to the off state, switch the balance piston side to the open state, and switch the adjustment system, bending roller system and lower wedge adjustment to manual mode or maintenance mode. S14. After completing the parameter reset and mode preset of the HMI operation screen, switch the main control selection switch of the cold straightening machine to the local control mode.

[0010] Preferably, step S2 includes the following steps: S21, Select multiple steel support blocks of equal height, the height of the steel support blocks of equal height corresponding to the height of the upper roller box when the roll gap of the cold straightener is opened to the maximum position; S22, the plurality of equal-height steel support blocks are placed in the non-roller surface area between the upper roller box and the lower roller box, and the plurality of equal-height steel support blocks are respectively located on the transmission side and the operation side of the roller box and are arranged symmetrically. S23, control the upper roller box to descend and fall onto the plurality of equal-height steel support blocks, so that the upper roller box is supported by the plurality of equal-height steel support blocks, thereby limiting the upper roller box from continuing to approach the lower roller box and avoiding pressure contact between the roller surfaces of the upper roller box and the lower roller box.

[0011] Preferably, step S3 includes the following steps: S31, confirm that the hydraulic system, lubrication system and compressed air system of the cold straightening machine are all in a depressurized state; S32, disconnect the hydraulic lines, lubrication lines and compressed air lines connected to the roller box to be replaced in sequence, and seal and protect the interfaces of each line after disconnection; S33, Remove the vibrator connector, which is a connecting pin connecting the lower roller box and the vibrator, so that the vibrator is separated from the lower roller box; S34, disconnect the wiring connector of the lower roller position sensor and wrap the wiring connector with protective covering to disconnect the roller box to be replaced from the external medium pipeline, vibrator and lower roller position sensor.

[0012] Preferably, step S4 includes the following steps: S41, switch the local operation panel of the cold straightener to the roll changing state and switch the operation permission to the maintenance mode; S42, control the lifting cylinder to move through the local operation panel, lift the lower roller box to the preset position, and stop lifting after the lower roller box reaches the preset position; S43, switch the local operation panel to the lower roller inspection position, switch the operation permission to the operation mode, control the upper roller box to descend and fall onto the equal-height steel support block; S44, switch the local operation panel to the roller changing state again, switch the operation permission to the maintenance mode, release the upper crossbeam clamping device, and move the upper crossbeam laterally to the avoidance position; S45, the upper locking cylinder and the lower locking cylinder are opened in sequence to release the locking devices of the upper roller box and the lower roller box.

[0013] Preferably, step S5 includes the following steps: S51, control the universal joint lifting element through the local operation panel to lift the universal joint to the zero position, and stop lifting after the universal joint reaches the zero position; S52, control the universal joint braking device to clamp and brake the universal joint that has reached the zero position, so that the universal joint is disengaged from the transmission end of the roller box to be replaced and remains locked.

[0014] Preferably, step S6 includes the following steps: S61, after confirming that the locking device is fully released and the universal joint remains locked, drive the roll changing trolley to move the roll box to be replaced from the cold straightening machine archway to the roll changing station. S62, the roller box to be replaced is lifted off the roller changing trolley and then the new roller box is lifted into the preset positioning slot of the roller changing trolley; S63, the reverse-drive roll changing trolley sends the new roll box into the preset installation position inside the cold straightener frame, and stops the roll changing trolley after the new roll box reaches the preset installation position; S64, first control the locking cylinder corresponding to the lower part of the new roller box in the upper and lower locking cylinders to perform the locking action, then control the locking cylinder corresponding to the upper part of the new roller box to perform the locking action. After the mechanical positioning of the new roller box is completed, the upper crossbeam is moved back to the working position and the upper crossbeam clamping device is locked.

[0015] Preferably, step S7 includes the following steps: S71, reinstall the hydraulic pipeline, lubrication pipeline, compressed air pipeline, vibrator connector and wiring connector in sequence, and confirm that all connection components are installed in place and that each pipeline interface is well sealed; S72, control the universal joint brake device to release, lower the universal joint lifting element back to the working position, so that the universal joint engages with the transmission end of the new roller box; S73, in the HMI operation screen, switch each control subsystem to automatic mode, and switch the main control selection switch of the cold straightener from local control mode to remote control mode; S74, the roll gap opening and closing action test, the bending roll system action test, and the AGC system action test are performed in sequence. After confirming that there are no abnormal alarms in the action of each system, the no-load running-in is carried out for a predetermined time. After confirming that the cold straightener is running normally, the roll change is completed.

[0016] Preferably, the step S6 of driving the roller changing trolley to send the new roller box into the preset installation position inside the straightener specifically includes: driving the roller changing trolley to smoothly send the new roller box into the straightener's frame, and stopping the roller changing trolley after triggering the limit switch to confirm that the new roller box has reached the preset installation position.

[0017] Preferably, the step S32 of sealing and protecting each pipe interface after dismantling specifically involves using dust plugs to seal each pipe interface to prevent impurities from entering the pipe system and causing pollution.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention significantly reduces downtime for roll changing and improves production efficiency. By integrating and optimizing the entire process of HMI parameter settings, mode switching, machine-side operation, and on-site work, the previously scattered and repetitive operation steps are standardized and ordered. This avoids operators having to travel back and forth between the main control room, the machine-side operation panel, and the equipment site multiple times, reducing ineffective operations and mode switching. The downtime for a single roll changing operation is reduced from the traditional 4 to 6 hours to less than 1 hour, significantly improving the production line's operating rate.

[0019] This invention standardizes operating procedures, reducing safety risks and equipment failure rates. By standardizing the operation sequence, interlocking logic, and safety protection of the entire roll changing process, the sequence of parameter reset, mode switching, and mechanical operation avoids equipment collisions, roll surface damage, and media leakage caused by misoperation. Furthermore, designs such as placing a support block between the upper and lower roll boxes to form mechanical limit protection, raising the universal joint to the disengaged position and clamping it, and lowering the upper roll box onto the support block for support before releasing the locking device, ensure the orderly connection of roll surface protection, transmission component locking, and controlled roll box support, guaranteeing the safety of equipment and personnel during roll changing and reducing safety risks.

[0020] This invention improves the alignment accuracy of roll changing and reduces subsequent debugging time. By pre-resetting parameters before roll changing to restore the roll system adjustment mechanism to its reference state, matching the height of the support block with the maximum roll gap opening to ensure controllable upper roll box placement height, and using a roll changing trolley to deliver the new roll box to the preset installation position within the archway, with positioning confirmed by a limit switch, the positioning accuracy of the new roll box after installation is guaranteed. This avoids the additional debugging and calibration work caused by roll box alignment deviations in traditional processes. After roll changing, only an unloaded operation test is required before production can commence, further shortening non-operational time.

[0021] The method of this invention is applicable to multi-roll cold straightening machines such as six-roll, eleven-roll, and seventeen-roll machines in various medium and heavy plate production lines. It does not require hardware modification of the equipment itself, and can achieve rapid roll change simply by optimizing the standardized operation process. It has wide applicability and significant economic benefits. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic flowchart of one embodiment of the present invention.

[0024] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] The technical solutions of 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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] Please refer to Figure 1 The present invention provides a method for rapid roll changing in a cold straightening machine, comprising the following steps: S1. After confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the cold straightener drive motor. Open the cold straightener roll gap to the maximum position. In the HMI operation screen, complete the straightening parameter reset, control mode shutdown and roll change mode preset, and switch the cold straightener from remote control mode to local control mode. S2, A support block is placed between the upper roller box and the lower roller box of the cold straightening machine, so that the support block is located below the landing path of the upper roller box, which is used to support the upper roller box and form a mechanical limit protection during the subsequent roller change process. S3. After confirming that the hydraulic system, lubrication system and compressed air system have been depressurized, disconnect the hydraulic pipeline, lubrication pipeline and compressed air pipeline connected to the roller box to be replaced, and disconnect the vibrator connection and lower roller position detection connection connected to the lower roller box, so that the roller box to be replaced is disconnected from the external medium pipeline, vibration component and detection component. S4, switch to the roll changing operation state through the local operation panel of the cold straightener, first lift the lower roll box to move out of the preset position, then control the upper roll box to descend and fall onto the support block, then move the upper crossbeam to the avoidance position, and release the locking device of the upper roll box and the lower roll box. S5, control the universal joint of the cold straightening machine to be raised to the preset disengagement position through the local operation panel, and clamp and brake the universal joint to disengage the universal joint from the transmission end of the roller box to be replaced and keep it locked. S6. After confirming that the locking device is released and the universal joint remains locked, drive the roller changing trolley to move the old roller box out of the cold straightening machine stand, hoist the new roller box to the positioning and bearing position of the roller changing trolley, and then drive the roller changing trolley in the reverse direction to send the new roller box into the preset installation position inside the cold straightening machine stand. S7. Lock and position the new roller box after it is fed in, reset and lock the upper crossbeam, reinstall the hydraulic pipeline, lubrication pipeline, compressed air pipeline, vibrator connector and lower roller position detection connector, release the clamping brake of the universal joint and make the universal joint mesh with the transmission end of the new roller box, restore the cold straightener to the remote control state, and perform a no-load operation test. After confirming that the cold straightener is running normally, the roller change is completed.

[0029] This invention significantly reduces downtime for roll changing and improves production efficiency. By integrating and optimizing the entire process of HMI parameter settings, mode switching, machine-side operation, and on-site work, the previously scattered and repetitive operation steps are standardized and ordered. This avoids operators having to travel back and forth between the main control room, the machine-side operation panel, and the equipment site multiple times, reducing ineffective operations and mode switching. The downtime for a single roll changing operation is reduced from the traditional 4 to 6 hours to less than 1 hour, significantly improving the production line's operating rate.

[0030] This invention standardizes operating procedures, reducing safety risks and equipment failure rates. By standardizing the operation sequence, interlocking logic, and safety protection of the entire roll changing process, the sequence of parameter reset, mode switching, and mechanical operation avoids equipment collisions, roll surface damage, and media leakage caused by misoperation. Furthermore, designs such as placing a support block between the upper and lower roll boxes to form mechanical limit protection, raising the universal joint to the disengaged position and clamping it, and lowering the upper roll box onto the support block for support before releasing the locking device, ensure the orderly connection of roll surface protection, transmission component locking, and controlled roll box support, guaranteeing the safety of equipment and personnel during roll changing and reducing safety risks.

[0031] This invention improves the alignment accuracy of roll changing and reduces subsequent debugging time. By pre-resetting parameters before roll changing to restore the roll system adjustment mechanism to its reference state, matching the height of the support block with the maximum roll gap opening to ensure controllable upper roll box placement height, and using a roll changing trolley to deliver the new roll box to the preset installation position within the archway, with positioning confirmed by a limit switch, the positioning accuracy of the new roll box after installation is guaranteed. This avoids the additional debugging and calibration work caused by roll box alignment deviations in traditional processes. After roll changing, only an unloaded operation test is required before production can commence, further shortening non-operational time.

[0032] The method of this invention is applicable to multi-roll cold straightening machines such as six-roll, eleven-roll, and seventeen-roll machines in various medium and heavy plate production lines. It does not require hardware modification of the equipment itself, and can achieve rapid roll change simply by optimizing the standardized operation process. It has wide applicability and significant economic benefits.

[0033] In a preferred embodiment, S1 includes the following steps: S11, after confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the cold straightener drive motor; after confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the drive motor to cut off the power source for the straightening roller rotation, so that the roller system is in a stationary state, providing a safe premise for subsequent operations.

[0034] S12, control the cold straightener roll gap to the maximum position through the HMI operation screen; control the straightener roll gap to the maximum position through the HMI operation screen to obtain the maximum physical distance between the upper and lower roll boxes, provide operating space for placing support blocks, and at the same time avoid contact and collision between the upper and lower roll surfaces in subsequent operations.

[0035] S13, in the HMI operation screen, set the AGC parameter to 120, set both the upper and lower wedge parameters to 0, switch the fully automatic mode, upper adjustment system, balance system, AGC system and lower wedge AGC system to the off state, switch the balance piston side to the open state, and switch the adjustment system, bending roller system and lower wedge adjustment to manual mode or maintenance mode. Complete the following operations on the HMI operation screen: Set the AGC parameter to 120, and set both the upper and lower wedge parameters to 0. This serves to: set the automatic roll gap control target value to a safe preset value, and restore the tilt adjustment mechanisms of the upper and lower roll systems to a parallel state, eliminating interference from residual process parameters on the roll changing operation.

[0036] Switch the fully automatic mode, upper adjustment system, balancing system, AGC system, and lower wedge AGC system to the off state. Switch the balancing piston side to the open state. Switch the adjustment system, bending roll system, and lower wedge adjustment to manual mode or maintenance mode. After completing the above parameter reset and mode preset, the target value of automatic roll gap control is set to the safety preset value. The tilt adjustment mechanism of the upper and lower roll systems returns to the parallel state. Each control subsystem exits the automatic production state and switches to single-step control by the operator, thereby eliminating the interference of residual process parameters on roll changing operations and reducing the risk of equipment malfunction during roll changing from the control logic level.

[0037] S14. After completing the parameter reset and mode preset of the HMI operation screen, switch the main control selection switch of the cold straightening machine to the local control mode.

[0038] Switch the main control selector switch of the cold straightening machine to local control mode, so that the control authority is transferred from the main control room to the machine-side operation panel, blocking remote operation commands and ensuring that subsequent operations are carried out safely under the visual confirmation of the operator.

[0039] In a preferred embodiment, S2 includes the following steps: S21, Select multiple steel support blocks of equal height, the height of the steel support blocks of equal height corresponding to the height of the upper roller box when the roll gap of the cold straightener is opened to the maximum position; Preferably, four steel support blocks of equal height are selected. The height of each support block matches the landing height of the upper roller box when the roll gap of the cold straightener is opened to its maximum position. This ensures that when the upper roller box descends to its final position, the bottom surface of the upper roller box can simultaneously contact the top surface of each support block. Using steel support blocks of equal height serves two purposes: firstly, the high compressive strength of steel ensures that the support blocks do not undergo plastic deformation or crushing under the weight of the upper roller box and the upper crossbeam; secondly, the consistent height of multiple support blocks ensures that the upper roller box remains horizontal after landing, preventing tilting of the upper roller box or localized stress on the roller surface due to unequal support heights.

[0040] S22, the plurality of equal-height steel support blocks are placed in the non-roller surface area between the upper roller box and the lower roller box, and the plurality of equal-height steel support blocks are respectively located on the transmission side and the operation side of the roller box and are arranged symmetrically. Specifically, four steel support blocks of equal height are placed in the non-roller surface area between the upper and lower roller boxes, with each support block located at both ends of the drive side and the operating side of the roller box, symmetrically arranged along the length of the roller box. The support blocks are placed in the non-roller surface area, i.e., areas on the roller box that do not directly contact the straightening rollers (such as the end frames of the roller box). When the upper roller box falls, the support blocks directly support the bottom surface of the roller box frame, rather than the roller surface of the straightening rollers within the roller box. This allows the weight of the upper roller box to be transferred to the support blocks through the roller box frame, preventing the straightening rollers from developing indentations, deformation, or surface damage due to bearing the weight of the upper roller box. The symmetrical arrangement of the support blocks on the drive and operating sides ensures that the upper roller box is evenly supported by the support blocks distributed at both ends of the roller box's longitudinal direction when it falls, preventing the upper roller box from tilting due to uneven loading.

[0041] S23, control the upper roller box to descend and fall onto the plurality of equal-height steel support blocks, so that the upper roller box is supported by the plurality of equal-height steel support blocks, thereby limiting the upper roller box from continuing to approach the lower roller box and avoiding pressure contact between the roller surfaces of the upper roller box and the lower roller box.

[0042] After placement, the upper roller box is slowly lowered via the local control panel or manual control of the cold straightener until its bottom surface contacts the top surface of each equal-height steel support block and it is completely placed on the support blocks. The descent stops once the upper roller box is confirmed to be supported by all the support blocks. At this point, the roller surface of the upper roller box is suspended above the roller surface of the lower roller box because the roller box frame is supported by the support blocks, maintaining a gap between them determined by the height of the support blocks. This step serves two purposes: firstly, the mechanical limiting effect of the support blocks prevents the upper roller box from moving further downwards, physically avoiding damage to the roller surfaces of the upper and lower roller boxes caused by contact pressure; secondly, the upper roller box is in a stable bearing state after being placed on the support blocks, providing a safe mechanical basis for the subsequent sequential removal of the locking devices of the upper and lower roller boxes, preventing the upper roller box from suddenly falling and impacting the support blocks or lower roller box due to gravity at the moment the locking devices are released.

[0043] In a preferred embodiment, S3 includes the following steps: S31. Confirm that the hydraulic, lubrication, and compressed air systems of the cold straightener are all depressurized. Before disassembling the connecting components, first confirm that the hydraulic, dry lubrication, and compressed air systems of the cold straightener are all depressurized, meaning that the oil pumps or air supply sources of each system have stopped operating, and the medium pressure in the pipelines has been released to atmospheric pressure. Confirming system depressurization is to prevent high-pressure hydraulic oil spraying that could injure personnel or high-pressure gas impact that could detach the joints and cause personal injury during pipeline disassembly, and also to avoid damage to the threads or sealing surfaces of the pipeline joints due to pressure during disassembly.

[0044] S32, sequentially disconnect the hydraulic lines, lubrication lines, and compressed air lines connected to the roller box to be replaced, and seal and protect the interfaces of each disconnected line. After all the above systems are depressurized, use a wrench or other tools to sequentially disconnect the hydraulic lines, dry oil lubrication lines, and compressed air lines connected to the upper and lower roller boxes. The hydraulic lines provide high-pressure hydraulic power to the roller box locking cylinder, bending roller cylinder, etc., the dry oil lubrication lines supply grease to the straightening roller bearing housing, and the compressed air lines provide air to the pneumatic components. After disconnecting each line, immediately seal and protect the line interfaces and the pipe joints on the roller box side with plugs or protective caps to prevent external dust, iron filings, moisture, and other impurities from entering the pipeline system and causing contamination. At the same time, prevent residual media in the pipeline from leaking and dripping onto the worktable of the cold straightening machine from open interfaces, and keep the work site clean.

[0045] S33, Remove the vibrator connector, which is a connecting pin connecting the lower roller box and the vibrator, to disengage the vibrator from the lower roller box; Remove the vibrator connector connecting the lower roller box and the vibrator. In this embodiment, the vibrator connector is specifically a connecting pin. The vibrator is a device installed below the lower roller box to apply auxiliary vibration to the lower roller box during the straightening process. The connecting pin hinges the output end of the vibrator to the connecting ear plate at the bottom of the lower roller box. After removing the connecting pin, the vibrator and the lower roller box are completely separated. This avoids pulling or damaging the related connecting structure when the lower roller box is lifted by the lifting cylinder, and also eliminates the need to remove the vibrator when changing rollers; only the roller box needs to be replaced.

[0046] S34, disconnect the wiring connector of the lower roller position sensor and wrap the wiring connector with protective covering to disconnect the roller box to be replaced from the external medium pipeline, vibrator and lower roller position sensor.

[0047] Disconnect the wiring connector at the end of the lower roller position sensor mounted on the lower roller box. The lower roller position sensor is used to detect the real-time position of the lower roller box during the straightening process and feed back the position signal to the control system. The wiring connector electrically connects the sensor's signal cable to the sensor body. After disconnecting the wiring connector, wrap it with a protective film or cover to prevent the wiring pins from being bent, broken, or contaminated with oil during the removal of the roller box, which could affect the reliability of the electrical connection after reinstallation. At this point, the hydraulic lines, lubrication lines, compressed air lines, vibrator, and lower roller position sensor connecting the roller boxes to be replaced (i.e., the upper and lower roller boxes) to the outside are completely disconnected. The roller boxes become independently removable components, providing the prerequisite for subsequent roller box pre-positioning and removal operations.

[0048] In a preferred embodiment, S4 includes the following steps: S41, switch the local operation panel of the cold straightener to roll change mode and switch the operation permission to maintenance mode. The operator locates the OS1.2 operation panel next to the cold straightener, switches the operation mode selection switch on this panel to roll change mode (ROLL SET CHANG), and rotates the operation permission key to the maintenance mode position. After switching the operation mode to roll change mode, the cold straightener's control program enters a dedicated roll change control logic, removing the operational restrictions on devices such as the locking cylinder, lifting cylinder, and upper crossbeam under normal production conditions. Switching the operation permission key to maintenance mode unlocks the high-level operation functions required during roll change, granting the operator direct control over key actuators such as the locking cylinder, lifting cylinder, and upper crossbeam clamping device. These two steps ensure that the roll change operation has legitimate control authorization, preventing the control system from rejecting operation commands due to insufficient authorization.

[0049] S42, control the lifting cylinder to move through the local operation panel, lift the lower roller box to the preset position, and stop lifting after the lower roller box reaches the preset position; Locate the control button for the lifting cylinder on the OS1.2 operation panel. Pressing this button extends the piston rod of the lifting cylinder, smoothly lifting the lower roller box from its current low position. When the lifting cylinder raises the lower roller box to the preset exit position, the limit switch installed at that position is triggered, sending a position signal to the control system, which automatically stops the lifting cylinder's movement. The height of this preset exit position corresponds to the carrying height of the subsequent roller changing trolley, allowing the lower roller box to be directly supported and moved out by the roller changing trolley after being locked at this position, without needing to readjust the height again.

[0050] S43, switch the local operation panel to the lower roller inspection position, switch the operation permission to the operation mode, control the upper roller box to descend and fall onto the equal-height steel support block; Switch the OS1.2 operation mode selection switch to the inspection position (INSP. BOTTOMROLL) and switch the operation permission key to operation mode. In inspection mode, the control button functions of the operation panel are mapped to the control channel of the upper roller box. Then, operate the corresponding control button to control the upper roller box to descend smoothly from the current position until the bottom surface of the upper roller box contacts the top surface of the multiple equal-height steel support blocks pre-placed in step S2. After confirming that the weight of the upper roller box is fully supported by the support blocks, stop the descent. By placing the upper roller box on the support blocks, the roller surface of the upper roller box is suspended above the roller surface of the lower roller box while maintaining a gap. The upper roller box is in a stable mechanical support state, providing a safe mechanical prerequisite for the subsequent release of the locking device and removal of the lower roller box.

[0051] S44, switch the local operation panel to the roller changing state again, switch the operation permission to the maintenance mode, release the upper crossbeam clamping device, and move the upper crossbeam laterally to the avoidance position; Switch the OS1.2 operation panel back to the roll change mode (ROLL SET CHANG) and switch the operation permission key to maintenance mode. In this combination, the operation panel unlocks control over the upper crossbeam clamping device and the upper crossbeam traversing mechanism. First, operate the corresponding control button to release the upper crossbeam clamping device, thus disengaging the upper crossbeam from the cold straightening machine frame. Then, control the upper crossbeam traversing frame drive mechanism to move the upper crossbeam horizontally to the clearance position. When the upper crossbeam reaches the limit switch at the clearance position, the traversing force automatically stops, and the upper crossbeam is moved out of the area directly above the upper and lower roll boxes. After the upper crossbeam swings out to the clearance position, the space directly above the upper and lower roll boxes is completely open, providing an unobstructed hoisting passage for subsequent use of hoisting equipment to lift the lower and upper roll boxes upwards or horizontally out of the frame.

[0052] S45, the upper locking cylinder and the lower locking cylinder are opened in sequence to release the locking devices of the upper roller box and the lower roller box.

[0053] On the OS1.2 operation panel, sequentially operate the control buttons corresponding to the top locking cylinder and the bottom locking cylinder to retract and open the locking pin or locking block of the top locking cylinder, and vice versa, thus releasing the locking devices of the upper and lower roller boxes. Opening the top locking cylinder first, followed by the bottom locking cylinder, ensures that the upper roller box remains supported by the support block during the locking release process, preventing displacement due to sudden release. The lower roller box, being lifted by the lifting cylinder, will not change position after locking, thus ensuring equipment safety during the locking process from the perspective of the operating sequence. Once both the top and bottom locking cylinders are fully open, the upper and lower roller boxes are in a free state without mechanical locking and can be freely moved by subsequent lifting cylinders, hoisting equipment, or roller changing trolleys.

[0054] Further, S5 includes the following steps: S51, the universal joint lifting element is controlled via the local operation panel to raise the universal joint to the zero position and stop lifting after reaching the zero position. The operator locates the OS1.3 operation panel next to the cold straightener and controls the operation of the LEVELLER RC SPINDLE LIFTING ELEMENT via this panel. The universal joint lifting element is an actuator installed on the upper part of the cold straightener frame for suspending and raising the upper roller universal joint. This lifting element drives the universal joint to rise vertically from its working position engaged with the roller box drive end, causing the bottom spline joint or flat head joint of the universal joint to gradually disengage from the corresponding interface of the roller box drive end. When the universal joint is raised to the preset zero position, the limit switch installed at the zero position is triggered, sending a stop signal to the control system, and the universal joint lifting element automatically stops lifting. At this point, a mechanical disengagement gap has been formed between the universal joint and the drive end of the roller box to be replaced. The universal joint no longer applies any constraint force to the roller box, and the roller box can be freely moved out of the archway.

[0055] S52, the universal joint braking device is controlled to clamp and brake the universal joint that has reached the zero position, disengaging the universal joint from the drive end of the roll box to be replaced and keeping it locked. After the universal joint reaches the zero position and stops, the operator triggers the upper roll universal joint braking device (LEVELLER RC TOP SPINDLE ARRESTING) through the OS1.3 operation panel to perform the clamping action. The clamping elements of the braking device (such as brake blocks or brakes) hold the shaft or coupling of the universal joint from both sides, fixing the universal joint in the zero position through friction or mechanical locking force. After the universal joint is clamped and braked, even if the cold straightener is subjected to external vibration or accidental contact during subsequent roll changing, the universal joint will not fall due to its own weight or swing in space, avoiding collisions between the universal joint and the incoming or outgoing roll box or the operator in a free-hanging state, ensuring the safety of personnel and equipment during the roll changing operation. At this point, the universal joint has been completely disengaged from the drive end of the roller box to be replaced and remains locked, ensuring unobstructed movement of the roller box.

[0056] In a preferred embodiment, step S6 includes the following steps: S61, after confirming that the locking device is fully released and the universal joint remains locked, drive the roller changing trolley to move the roller box to be replaced from the cold straightening machine archway to the roller changing station. After confirming that both the upper and lower locking cylinders are fully open and the universal joint brake is in the clamping and locking state, the operator drives the roll changing trolley via the control button, causing its carrying platform to enter the area below the roll box to be replaced inside the cold straightener stand. Once the carrying platform contacts and lifts the bottom of the roll box, the trolley continues to move laterally along the track from inside the cold straightener stand to the outside, transporting the entire roll box to the roll changing station. The roll changing station is a predetermined stopping position located outside the cold straightener stand, with no obstructions above, facilitating hoisting operations by the overhead crane. Moving the roll box laterally by the roll changing trolley replaces the traditional method of manually dragging the roll box out of the stand using pry bars and jacks, improving the efficiency and safety of the roll box removal process while avoiding the risks of tilting and collisions caused by uneven force on the roll box during manual dragging.

[0057] S62, the roller box to be replaced is lifted off the roller changing trolley and then the new roller box is lifted into the preset positioning slot of the roller changing trolley; After the replacement roller box arrives at the roller changing station, a workshop overhead crane lifts it from the roller changing trolley's support platform and transports it to the designated roller box storage area. Then, the crane lifts the pre-prepared new roller box and smoothly moves it above the roller changing trolley's support platform. The new roller box is aligned with the pre-cut positioning slot on the roller changing trolley's support platform and slowly lowered, ensuring the bottom positioning boss or positioning surface of the new roller box is embedded in the pre-cut positioning slot. This confirms that the new roller box is accurately positioned on the roller changing trolley without any shaking. The pre-cut positioning slot matches the positioning structure at the bottom of the new roller box in size and position. Its function is to ensure that the position of the new roller box relative to the roller changing trolley remains fixed during the process of sending the new roller box from the outside of the trolley into the trolley. This ensures that when the roller changing trolley sends the new roller box into the pre-cut installation position inside the trolley, the new roller box can accurately correspond to the locking device, transmission end interface, and centering reference surface inside the trolley, eliminating the need for manual prying and adjustment after it has been sent into the trolley.

[0058] S63, the reverse-drive roll changing trolley sends the new roll box into the preset installation position inside the cold straightener frame, and stops the roll changing trolley after the new roll box reaches the preset installation position; After the new roller box is positioned on the roller changing trolley, the trolley is driven in reverse, moving laterally along the track from the outside of the gantry to the inside. When the new roller box enters the gantry with the trolley and reaches the preset installation position, the limit switch installed at that position is triggered, and the roller changing trolley automatically stops. The preset installation position is a positioning reference point pre-calibrated based on the position of the locking cylinder inside the cold straightening machine gantry, the position of the drive end interface, and the design value of the roller box alignment reference. At this position, the locking interface of the new roller box is aligned with the locking cylinder on the gantry, and the drive end interface is aligned with the lower interface of the universal joint, providing an initial alignment reference for subsequent locking and drive engagement.

[0059] S64, first control the locking cylinder corresponding to the lower part of the new roller box in the upper and lower locking cylinders to perform the locking action, then control the locking cylinder corresponding to the upper part of the new roller box to perform the locking action. After the mechanical positioning of the new roller box is completed, the upper crossbeam is moved back to the working position and the upper crossbeam clamping device is locked.

[0060] After the new roller box reaches the preset installation position, the lower locking cylinder is first controlled to perform a locking action, causing the locking pin or locking block of the lower locking cylinder to extend and insert into the corresponding locking hole or locking groove of the lower roller box, mechanically locking the lower roller box to the cold straightener frame. Then, the upper locking cylinder is controlled to perform a locking action, causing the locking pin or locking block of the upper locking cylinder to extend and insert into the corresponding locking hole or locking groove of the upper roller box, mechanically locking the upper roller box to the cold straightener frame. After the new roller box is locked sequentially by the upper and lower locking cylinders, it achieves a definite mechanical position within the frame. After locking is completed, the upper crossbeam is moved laterally from the clearance position back to the working position. When the upper crossbeam reaches the working position and triggers the limit switch, the upper crossbeam clamping device is locked, re-establishing a fixed connection between the upper crossbeam and the cold straightener frame. At this point, the roller changing trolley has completed the entire process of removing the old roller box and sending in the new roller box for alignment and installation.

[0061] In a preferred embodiment, S7 includes the following steps: S71, reinstall the hydraulic pipeline, lubrication pipeline, compressed air pipeline, vibrator connector and wiring connector in sequence, and confirm that all connection components are installed in place and that each pipeline interface is well sealed; After the new roller box is locked and positioned and the upper crossbeam is reset and locked, reinstall the pipelines and connecting components in the reverse order of step S3. Reinstall the compressed air pipeline, dry lubrication pipeline, and hydraulic pipeline in sequence, ensuring that the two ends of each pipeline are correctly aligned and tightened with the roller box side pipe joint and the equipment side pipe joint, respectively. Reinstall the connecting pin between the lower roller box and the vibrator, inserting the connecting pin into the ear hole at the vibrator output end and the pin hole in the connecting ear plate at the bottom of the lower roller box, and install a cotter pin or retaining ring for axial positioning. Reinstall the wiring connector of the lower roller position sensor, inserting the pin of the wiring connector into the socket of the sensor body and tightening the lock nut. After all reinstallation is complete, check and confirm that all connecting components are installed in place without looseness or omissions, and that there is no leakage at the sealing surfaces of each pipeline interface. By reinstalling the pipelines and connecting components, the hydraulic power supply, lubrication medium supply, compressed air supply, vibration assistance function, and position signal detection function between the cold straightener and the new roller box were restored, enabling the various functional subsystems of the cold straightener to re-establish a complete connection with the new roller box.

[0062] S72, control the universal joint brake device to release, lower the universal joint lifting element back to the working position, so that the universal joint engages with the transmission end of the new roller box; The universal joint brake is released via the OS1.3 control panel, releasing the clamping brake on the universal joint. Then, the universal joint lifting element smoothly descends from the zero position to the working position. During the descent, the splined or flat-head joint at its bottom gradually approaches and eventually inserts into the corresponding interface on the drive end of the new roller box, completing the engagement between the universal joint and the drive end of the new roller box. After the universal joint re-engages with the roller box drive end, the mechanical transmission link of the drive motor transmitting rotational torque to the straightening roller via the universal joint is restored, providing power transmission conditions for the cold straightener to resume production. After the universal joint lifting element returns to the working position, its own weight is supported by the drive end bearing seat or bracket of the new roller box, no longer suspended by the lifting element, returning to the supported state during normal production.

[0063] S73, in the HMI operation screen, switch each control subsystem to automatic mode, and switch the main control selection switch of the cold straightener from local control mode to remote control mode; The operator returned to the main control room and, on the primary HMI screen of the cold straightener, restored each control subsystem to automatic mode one by one: switching the adjustment system from manual / maintenance mode back to automatic, the bending roller system from manual to automatic, the lower wedge adjustment from manual to automatic, the balancing system from off to on, the upper adjustment system from off to on, the AGC system and the lower wedge AGC system from off to on or automatic, and finally, the fully automatic mode from off to on. After all subsystems were restored to automatic mode, the cold straightener regained its ability to perform automatic closed-loop adjustment based on real-time parameters such as sheet thickness and shape deviation. Subsequently, the operator switched the cold straightener's master control selector from local control mode to remote control mode, transferring control authority from the machine-side control panel back to the HMI screen in the main control room, thus restoring the cold straightener to the remote centralized control mode used during normal production.

[0064] S74, the roll gap opening and closing action test, the bending roll system action test, and the AGC system action test are performed in sequence. After confirming that there are no abnormal alarms in the action of each system, the no-load running-in is carried out for a predetermined time. After confirming that the cold straightener is running normally, the roll change is completed.

[0065] After the cold straightener was restored to remote control status, the operator performed the following no-load operation tests on the cold straightener through the HMI interface: First, the roll gap opening and closing operation was tested by controlling the upper roll box to move up and down several times to confirm that the roll gap adjustment mechanism was flexible and without jamming; then, the bending roll system operation was tested by applying forward and reverse bending roll forces to the bending roll cylinder to confirm that the bending roll system responded promptly and without abnormal vibration; finally, the AGC system operation was tested by simulating the input thickness deviation signal to confirm that the AGC system could correctly respond and output roll gap adjustment commands. After confirming that the no-load operation of the above systems was normal and that there were no alarm messages on the HMI interface, a 30-minute no-load run-in was performed, that is, the straightening rolls were driven continuously at low speed without feeding material to confirm that the roll system rotated smoothly without abnormal vibration or noise, and that the temperature rise of each bearing seat was normal. After the no-load run-in was completed, the cold straightener was ready to resume normal production, and all roll changing operations were completed.

[0066] Preferably, step S6, which involves driving the roll-changing trolley to deliver the new roll box into the preset installation position within the straightening machine's frame, specifically includes: driving the roll-changing trolley to smoothly deliver the new roll box into the straightening machine's frame, and stopping the roll-changing trolley after triggering the limit switch to confirm that the new roll box has reached the preset installation position. When driving the roll-changing trolley to deliver the new roll box into the preset installation position within the frame, the operator drives the roll-changing trolley via the control button, causing the trolley carrying the new roll box to smoothly move laterally along the track from the outside of the frame to the inside. When the new roll box enters the frame with the roll-changing trolley and reaches the pre-marked preset installation position, the limit switch at that position is triggered by the corresponding trigger of the new roll box or the roll-changing trolley, sending a positioning signal to the control system. The roll-changing trolley automatically stops, thus confirming that the new roll box has accurately reached the preset installation position. The new roller box is confirmed to have reached the preset installation position by triggering the limit switch. This replaces the traditional method in which operators rely on visual judgment to determine whether the roller box is in place. The placement and positioning of the new roller box no longer depends on the operator's personal experience, improving the objectivity and consistency of positioning. This ensures that the locking interface on the new roller box is aligned with the locking cylinder on the gate, and that the transmission end interface is aligned with the universal joint interface, providing a precise alignment reference for subsequent locking operations.

[0067] Preferably, the sealing and protection of each dismantled pipeline interface in step S32 specifically involves: using dust plugs to seal each pipeline interface to prevent impurities from entering the pipeline system and causing contamination. After dismantling each hydraulic pipeline, dry lubrication pipeline, or compressed air pipeline, immediately select a dust plug matching the size of the pipeline interface and screw or press it into the pipeline interface and equipment side pipe joint to seal it. As a dedicated protective component for sealing pipeline interfaces, the dust plug effectively prevents dust, iron filings, moisture, and other impurities from the external environment from entering the hydraulic system, lubrication system, or compressed air system through open pipeline interfaces, preventing impurities from flowing with the medium in the pipeline to precision components such as hydraulic valve cores, lubrication distributors, or pneumatic components, causing blockages or accelerated wear. Simultaneously, sealing with dust plugs also prevents residual medium in the pipeline from flowing out of open interfaces and dripping onto the cold straightening machine's worktable or the ground, maintaining a clean work site and reducing the safety risk of operators slipping on wet surfaces.

[0068] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for rapid roll changing in a cold straightener, characterized in that, Includes the following steps: S1. After confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the cold straightener drive motor. Open the cold straightener roll gap to the maximum position. In the HMI operation screen, complete the straightening parameter reset, control mode shutdown and roll change mode preset, and switch the cold straightener from remote control mode to local control mode. S2, A support block is placed between the upper roller box and the lower roller box of the cold straightening machine, so that the support block is located below the landing path of the upper roller box, which is used to support the upper roller box and form a mechanical limit protection during the subsequent roller change process. S3. After confirming that the hydraulic system, lubrication system and compressed air system have been depressurized, disconnect the hydraulic pipeline, lubrication pipeline and compressed air pipeline connected to the roller box to be replaced, and disconnect the vibrator connection and lower roller position detection connection connected to the lower roller box, so that the roller box to be replaced is disconnected from the external medium pipeline, vibration component and detection component. S4, switch to the roll changing operation state through the local operation panel of the cold straightener, first lift the lower roll box to move out of the preset position, then control the upper roll box to descend and fall onto the support block, then move the upper crossbeam to the avoidance position, and release the locking device of the upper roll box and the lower roll box. S5, control the universal joint of the cold straightening machine to be raised to the preset disengagement position through the local operation panel, and clamp and brake the universal joint to disengage the universal joint from the transmission end of the roller box to be replaced and keep it locked. S6. After confirming that the locking device is released and the universal joint remains locked, drive the roller changing trolley to move the old roller box out of the cold straightening machine stand, hoist the new roller box to the positioning and bearing position of the roller changing trolley, and then drive the roller changing trolley in the reverse direction to send the new roller box into the preset installation position inside the cold straightening machine stand. S7. Lock and position the new roller box after it is fed in, reset and lock the upper crossbeam, reinstall the hydraulic pipeline, lubrication pipeline, compressed air pipeline, vibrator connector and lower roller position detection connector, release the clamping brake of the universal joint and make the universal joint mesh with the transmission end of the new roller box, restore the cold straightener to the remote control state, and perform a no-load operation test. After confirming that the cold straightener is running normally, the roller change is completed.

2. The method for rapid roll changing in a cold straightener according to claim 1, characterized in that, S1 includes the following steps: S11. After confirming that no sheet material has passed through the cold straightener, stop the production line feeding and turn off the cold straightener drive motor. S12, the cold straightener roll gap is opened to the maximum position via the HMI operation screen; S13, in the HMI operation screen, set the AGC parameter to 120, set both the upper and lower wedge parameters to 0, switch the fully automatic mode, upper adjustment system, balance system, AGC system and lower wedge AGC system to the off state, switch the balance piston side to the open state, and switch the adjustment system, bending roller system and lower wedge adjustment to manual mode or maintenance mode. S14. After completing the parameter reset and mode preset of the HMI operation screen, switch the main control selection switch of the cold straightening machine to the local control mode.

3. The method for rapid roll changing in a cold straightener according to claim 1, characterized in that, S2 includes the following steps: S21, Select multiple steel support blocks of equal height, the height of the steel support blocks of equal height corresponding to the height of the upper roller box when the roll gap of the cold straightener is opened to the maximum position; S22, the plurality of equal-height steel support blocks are placed in the non-roller surface area between the upper roller box and the lower roller box, and the plurality of equal-height steel support blocks are respectively located on the transmission side and the operation side of the roller box and are arranged symmetrically. S23, control the upper roller box to descend and fall onto the plurality of equal-height steel support blocks, so that the upper roller box is supported by the plurality of equal-height steel support blocks, thereby limiting the upper roller box from continuing to approach the lower roller box and avoiding pressure contact between the roller surfaces of the upper roller box and the lower roller box.

4. The method for rapid roll changing in a cold straightener according to claim 3, characterized in that, S3 includes the following steps: S31, confirm that the hydraulic system, lubrication system and compressed air system of the cold straightening machine are all in a depressurized state; S32, disconnect the hydraulic lines, lubrication lines and compressed air lines connected to the roller box to be replaced in sequence, and seal and protect the interfaces of each line after disconnection; S33, Remove the vibrator connector, which is a connecting pin connecting the lower roller box and the vibrator, so that the vibrator is separated from the lower roller box; S34, disconnect the wiring connector of the lower roller position sensor and wrap the wiring connector with protective covering to disconnect the roller box to be replaced from the external medium pipeline, vibrator and lower roller position sensor.

5. The method for quick roll changing in a cold straightener according to claim 4, characterized in that, S4 includes the following steps: S41, switch the local operation panel of the cold straightener to the roll changing state and switch the operation permission to the maintenance mode; S42, control the lifting cylinder to move through the local operation panel, lift the lower roller box to the preset position, and stop lifting after the lower roller box reaches the preset position; S43, switch the local operation panel to the lower roller inspection position, switch the operation permission to the operation mode, control the upper roller box to descend and fall onto the equal-height steel support block; S44, switch the local operation panel to the roller changing state again, switch the operation permission to the maintenance mode, release the upper crossbeam clamping device, and move the upper crossbeam laterally to the avoidance position; S45, the upper locking cylinder and the lower locking cylinder are opened in sequence to release the locking devices of the upper roller box and the lower roller box.

6. The method for rapid roll changing in a cold straightener according to claim 5, characterized in that, S5 includes the following steps: S51, control the universal joint lifting element through the local operation panel to lift the universal joint to the zero position, and stop lifting after the universal joint reaches the zero position; S52, control the universal joint braking device to clamp and brake the universal joint that has reached the zero position, so that the universal joint is disengaged from the transmission end of the roller box to be replaced and remains locked.

7. The method for rapid roll changing in a cold straightener according to claim 6, characterized in that, S6 includes the following steps: S61, after confirming that the locking device is fully released and the universal joint remains locked, drive the roll changing trolley to move the roll box to be replaced from the cold straightening machine archway to the roll changing station. S62, the roller box to be replaced is lifted off the roller changing trolley and then the new roller box is lifted into the preset positioning slot of the roller changing trolley; S63, the reverse-drive roll changing trolley sends the new roll box into the preset installation position inside the cold straightener frame, and stops the roll changing trolley after the new roll box reaches the preset installation position; S64, first control the locking cylinder corresponding to the lower part of the new roller box in the upper and lower locking cylinders to perform the locking action, then control the locking cylinder corresponding to the upper part of the new roller box to perform the locking action. After the mechanical positioning of the new roller box is completed, the upper crossbeam is moved back to the working position and the upper crossbeam clamping device is locked.

8. The method for rapid roll changing in a cold straightener according to claim 7, characterized in that, S7 includes the following steps: S71, reinstall the hydraulic pipeline, lubrication pipeline, compressed air pipeline, vibrator connector and wiring connector in sequence, and confirm that all connection components are installed in place and that each pipeline interface is well sealed; S72, control the universal joint brake device to release, lower the universal joint lifting element back to the working position, so that the universal joint engages with the transmission end of the new roller box; S73, in the HMI operation screen, switch each control subsystem to automatic mode, and switch the main control selection switch of the cold straightener from local control mode to remote control mode; S74, the roll gap opening and closing action test, the bending roll system action test, and the AGC system action test are performed in sequence. After confirming that there are no abnormal alarms in the action of each system, the no-load running-in is carried out for a predetermined time. After confirming that the cold straightener is running normally, the roll change is completed.

9. The method for rapid roll changing in a cold straightener according to claim 1, characterized in that, Step S6, which involves driving the roller changing trolley to deliver the new roller box into the preset installation position inside the straightener, specifically includes: driving the roller changing trolley to smoothly deliver the new roller box into the straightener's frame, and stopping the roller changing trolley after triggering the limit switch to confirm that the new roller box has reached the preset installation position.

10. The method for rapid roll changing in a cold straightener according to claim 4, characterized in that, The step S32, which involves sealing and protecting the dismantled pipe interfaces, specifically involves using dust plugs to seal each pipe interface to prevent impurities from entering the pipe system and causing pollution.

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