A horizontal mill split type oil cylinder modification and new valve block alignment process

Abstract

The present application relates to the technical field of rolling equipment modification maintenance, and discloses a horizontal rolling mill split type oil cylinder modification and new valve block alignment process, which comprises the following steps: step 1, pretreatment and state detection of the equipment before modification; step 2, old type inlaid oil cylinder disassembly and installation surface treatment; step 3, split type oil cylinder selection and accurate assembly; step 4, new valve block design and installation surface pretreatment; step 5, accurate alignment and fixed installation of the new valve block; step 6, hydraulic system pressure debugging and action test; and step 7, frame reset and overall process review. The process realizes automatic and smooth opening and closing of the clamping cylinder, and completely solves the core fault. Through modification of the inlaid oil cylinder into a split type structure, the process eliminates the additional force of the installation hole wear deformation on the oil cylinder, and realizes automatic and smooth opening and closing of the clamping cylinder through accurate alignment and pressure optimization of the new valve block, thereby completely eliminating the problem that the clamping cylinder cannot be automatically opened in the traditional process.

Description

Technical Field

[0001] This invention relates to the field of steel rolling equipment modification and maintenance technology, specifically to a process for modifying a split-type hydraulic cylinder in a horizontal rolling mill and aligning a newly added valve block. Background Technology

[0002] As the core equipment for high-speed wire rod production, the stable operation of the horizontal rolling mill's clamping system directly determines the efficiency of roll changing and groove changing, as well as the continuity of production. Among them, the automatic opening and closing function of the clamping cylinder is a key link to ensure the normal turnover of the equipment.

[0003] The core and most relevant technical problem with the current horizontal rolling mill clamping system is the poor adaptability of the embedded clamping cylinder structure, which prevents the clamping cylinder from opening automatically and requires manual assistance. After long-term operation, the horizontal rolling mill frame and cylinder mounting holes experience varying degrees of wear, causing the fit clearance to exceed the standard range. Since the embedded cylinder and mounting hole are designed as an integrated unit, wear and deformation of the mounting hole exert additional force on the cylinder body, causing the cylinder to jam and preventing automatic opening. To maintain production, a manual pump must be installed on-site, and professionals must manually apply pressure to forcibly open the clamping cylinder during roll and groove changes. This method not only consumes professional manpower and increases the labor intensity of personnel, but also wastes a significant amount of production time, resulting in low efficiency in roll and groove changes, frequent production interruptions, and seriously affecting the continuity and stability of high-speed production, while also increasing equipment maintenance costs. Therefore, there is an urgent need for a process method that solves the automatic opening and closing failure of the clamping cylinder through structural modification and precise alignment, thus overcoming the above-mentioned core pain points. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a process for modifying a split-type hydraulic cylinder for a horizontal rolling mill and aligning a newly added valve block. This process offers advantages such as enabling the clamping cylinder to open and close automatically and smoothly, and completely resolving core malfunctions. It also solves the problem of poor adaptability of the embedded clamping hydraulic cylinder structure, which prevents the clamping cylinder from opening automatically and necessitates manual assistance.

[0005] (II) Technical Solution To achieve the goal of automatically and smoothly opening and closing the clamping cylinder and completely solving the core fault, this invention provides the following technical solution: a process for modifying a split-type hydraulic cylinder and aligning a new valve block in a horizontal rolling mill, including step 1: pre-processing and status detection of the equipment before modification; step 2: disassembly and surface treatment of the old-type embedded hydraulic cylinder; step 3: selection and precise assembly of the split-type hydraulic cylinder; step 4: design and pre-processing of the new valve block; step 5: precise alignment and fixed installation of the new valve block; step 6: hydraulic system pressure debugging and action testing; step 7: gate resetting and overall process verification, wherein step 7: gate resetting and overall process verification includes step 701 conducting a comprehensive inspection of the modified system and step 702 recording key modification parameters.

[0006] Preferably, step 1 involves: pre-processing and condition detection of the equipment before modification; A comprehensive shutdown inspection was conducted on the horizontal rolling mill stand, with a focus on checking the wear of the arches. The mating clearances of each arch were measured to ensure that the clearances were controlled within 0.1-0.5mm. Any online arches that exceeded the range were replaced. After the spare arches were replenished, the offline arches were sent to the maintenance area for repair. Turn off the main power supply and oil circuit valves of the hydraulic system, release the residual pressure of the clamping system (pressure drops to 0-0.5MPa), remove the protective components around the cylinder, and clean the oil stains, iron filings and impurities from the frame mounting surface; The roundness and cylindricity of the cylinder mounting holes are tested using a dial indicator. The roundness deviation is ≤0.2-0.8mm and the cylindricity deviation is ≤0.3-1.0mm. Severely worn mounting holes are repaired and polished to ensure the assembly accuracy of subsequent split-type cylinders.

[0007] Preferably, step 2 involves disassembling and treating the mounting surface of the old-type embedded hydraulic cylinder. Remove the fixing bolts and hydraulic pipe joints of the embedded cylinder in sequence, and record the position and direction of the oil pipe connection to avoid subsequent assembly errors; use a special lifting tool to steadily remove the old cylinder and place it in the designated maintenance area to avoid collision damage; Use a high-pressure cleaner with a neutral cleaning agent to thoroughly clean the inner wall of the cylinder mounting hole and the mating surface of the frame, removing rust, oil, and sealant residue. The cleaning area should cover the full depth of the mounting hole and the surrounding 10-30mm area of ​​the mating surface. The inner wall of the mounting hole is ground to ensure a surface roughness Ra≤1.6-3.2μm. After wiping it clean with a lint-free cloth, a layer of anti-rust grease is evenly applied to the mating surface to provide protection and lubrication for the assembly of the split-type hydraulic cylinder.

[0008] Preferably, step 3 involves selecting and precisely assembling a split-type hydraulic cylinder. Select a split-type hydraulic cylinder that matches the specifications of the mounting holes on the frame. The clearance between the cylinder body and the piston is controlled within 0.05-0.20mm. The seals are made of high-pressure resistant and wear-resistant materials to ensure compatibility with the working pressure of the hydraulic system. The split-type hydraulic cylinder is slowly fed into the mounting hole using a lifting tool. The position of the hydraulic cylinder is adjusted to ensure that the coaxiality deviation between the hydraulic cylinder axis and the mounting hole axis is ≤0.2-0.8mm, and the cylinder end face is in close contact with the frame contact surface with a flatness deviation of ≤0.3-1.2mm. Use high-strength bolts to symmetrically tighten the cylinder fixing flange, controlling the tightening torque to 50-85 N·m, and tighten evenly in three stages to avoid uneven local stress that could cause cylinder deformation; connect the hydraulic oil pipes, ensuring that the joints are properly sealed and there is no risk of leakage.

[0009] Preferably, step 4 involves: designing the new valve block and pre-treating the mounting surface; A new valve block was designed based on the pressure requirements of the clamping system. The internal flow channel of the valve block is adapted to the opening and closing flow of the hydraulic cylinder, and a pressure adjustment interface is reserved to ensure that the pressure in the opening direction of the clamping cylinder can be stably adjusted to 140-160 kgf / cm². 2 The clamping pressure is maintained at 75-85 kgf / cm. 2 ; Clean the original valve platform mounting surface of the rolling mill to remove oil stains, bolt residue and oxide layer, and ensure that the flatness deviation of the mounting surface is ≤0.3-1.0mm. Use a spirit level to calibrate the levelness of the mounting surface, and the levelness deviation is ≤0.2-0.6mm / m. Measure the spacing and diameter of the valve mounting holes, match the position of the fixing holes of the newly added valve block, and ensure that the hole position deviation is ≤0.2-0.7mm, so as to provide a basis for the precise alignment of the valve block.

[0010] Preferably, step 5 involves precisely aligning and fixing the newly added valve block. Using a dial indicator for assisted positioning, the new valve block is fitted to the valve seat mounting surface. The position of the valve block is adjusted to ensure that the coaxiality deviation between the oil inlet and outlet of the valve block and the original pipeline interface is ≤0.2-0.8mm, and the flow channel is aligned without offset. The valve block is temporarily fixed with a locating pin. The fit gap between the valve block and the valve seat is checked. The gap value is ≤0.1-0.4mm, and the circumferential gap is uniform with no warping or hanging. Install and fix the bolts and tighten them symmetrically, with the tightening torque controlled at 35-60 N·m to ensure that the valve block and valve seat fit tightly without loosening or displacement; use a torque wrench to tighten the joints of the hydraulic oil pipes connecting the valve block and the clamping cylinder, with a tightening torque of 15-30 N·m to avoid leakage.

[0011] Preferably, step 6 involves: hydraulic system pressure adjustment and motion testing; Turn on the hydraulic system power and slowly increase the pressure to the working pressure range. Set the parameters through the valve block pressure adjustment interface: first adjust the clamping directional pressure to 75-85 kgf / cm². 2 Then adjust the opening direction pressure to 140-160 kgf / cm. 2 After the pressure stabilizes, maintain the pressure for 30-60 seconds; Start the automatic opening and closing test of the clamping cylinder, operate continuously for 5-10 times, observe whether the cylinder movement is smooth, without jamming or abnormal noise, and control the opening and closing time of each operation to 3-8 seconds. Check the stroke accuracy of the clamping cylinder, and the stroke deviation should be ≤0.5-1.5mm. Simulate roller and trough changing conditions to test the coordination of continuous operation of multiple frames. Focus on verifying the opening and closing status of the clamping cylinders of frames 3, 5, 7, and 9 that are prone to failure, to ensure that there are no cases where the cylinders cannot be opened automatically.

[0012] Preferably, step 7: repositioning the archway and verifying the overall process; The repaired spare archway or new archway is precisely installed and reset, and the archway fixing bolts are tightened to ensure that the fit between the archway and the frame is uniform and ≤0.1-0.5mm. The overall rigidity of the frame is checked and there is no loosening or deformation.

[0013] Preferably, step 701 involves a comprehensive test of the modified system: a pressure sensor is used to monitor the stability of the valve block's working pressure, and the pressure fluctuation is ≤ ±5 kgf / cm² within 30 minutes. 2 The hydraulic cylinder and valve block connection pipeline was checked with a leakage detector, and no hydraulic oil leakage was found.

[0014] Preferably, step 702 records key modification parameters: cylinder model, valve block specifications, pressure setting value, and installation clearance data, forming a modification log to provide a reference for subsequent maintenance; cleans up on-site tools and debris, and completes process acceptance.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides a process for modifying a split-type hydraulic cylinder in a horizontal rolling mill and aligning a newly added valve block, which has the following beneficial effects: 1. The modification of the split-type hydraulic cylinder and the addition of a valve block alignment process for this horizontal rolling mill achieves automatic and smooth opening and closing of the clamping cylinder, completely solving the core fault: This process, by modifying the embedded hydraulic cylinder into a split structure, eliminates the additional force on the hydraulic cylinder caused by the wear and deformation of the mounting hole, combined with the precise alignment and pressure optimization of the added valve block (opening direction pressure 140-160 kgf / cm²). 2 Clamping directional pressure 75-85 kgf / cm 2 This technology enables the automatic and smooth opening and closing of the clamping cylinder, completely eliminating the problem of the clamping cylinder failing to open automatically in traditional processes, eliminating the need for manual pump assistance, and fundamentally solving the potential for production interruptions.

[0016] 2. The modification of the split-type hydraulic cylinder and the addition of a valve block alignment process for the horizontal rolling mill shortens the roll and groove changing time and improves production continuity: After the modification, the clamping cylinder opens and closes automatically without the need for professional personnel to follow up, which greatly simplifies the roll and groove changing process and effectively shortens the time of a single operation; at the same time, it avoids production stoppages caused by clamping failures. According to relevant material data, it can significantly reduce the time of such accidents (the original cumulative accident time reached 280 minutes / year), and greatly improve the continuity and overall efficiency of high-speed wire rod production.

[0017] 3. The modification of the split-type hydraulic cylinder and the addition of valve block alignment process for this horizontal rolling mill reduce labor intensity and maintenance costs: The automated opening and closing function completely changes the traditional operation mode that relies on manual pressurization, alleviating the predicament of needing daytime professional personnel to support the night shift, and significantly reducing the labor intensity of the staff; The split-type hydraulic cylinder structure makes it easy to disassemble and repair individually without disassembling the entire frame. Combined with the archway repair and reuse strategy, it reduces the frequency of spare parts replacement and greatly saves spare parts procurement costs and equipment maintenance costs (saving about 120,000 yuan per unit).

[0018] 4. The process for modifying the split-type hydraulic cylinder and aligning the newly added valve block in this horizontal rolling mill features high assembly precision and strong operational stability. Precise parameter control standards are defined for each stage of the process (cylinder coaxiality deviation ≤ 0.2-0.8mm, valve block flow channel coaxiality deviation ≤ 0.2-0.8mm). Through comprehensive process control including pre-treatment testing, precise assembly, and debugging verification, the installation accuracy of the split-type hydraulic cylinder and the newly added valve block is guaranteed. The selection of high-pressure and wear-resistant seals and the design for stable pressure regulation reduce wear and leakage risks during equipment operation, extend the service life of the clamping system, and reduce the frequency of fault recurrence.

[0019] 5. The process for modifying the split-type hydraulic cylinder and adding valve block alignment in this horizontal rolling mill is highly adaptable and reproducible: all key parameters are reasonably expanded based on actual on-site operational needs (fitting gap 0.1-0.5mm, tightening torque 35-85N・m), which can adapt to the modification needs of horizontal rolling mills of different specifications; the standardized process of "pre-treatment-dismantling-modification and assembly-valve block alignment-debugging and verification", coupled with clear testing standards and operating procedures, reduces the dependence on the skill level of operators, making it easy to promote and apply in batches in similar horizontal rolling mill equipment, and has strong practical value and reproducibility.

[0020] 6. The modification of the split-type hydraulic cylinder and the addition of valve block alignment process for this horizontal rolling mill improve the overall precision of the equipment and ensure production quality: Through a series of improvements such as frame repair and replacement, mounting surface grinding, and precise alignment of the hydraulic cylinder and valve block, not only was the opening and closing failure of the clamping cylinder resolved, but the overall fit accuracy of the frame was also optimized, reducing vibration and deviation during equipment operation, and providing a reliable guarantee for the product quality stability of high-speed wire rod production. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] This solution provides a technical approach: a process for retrofitting a split-type hydraulic cylinder and aligning a new valve block on a horizontal rolling mill. The core logic of this process is "pre-treatment - dismantling - retrofitting and assembly - valve block alignment - debugging and verification." Upgrades are implemented without altering the main structure of the rolling mill. All parameters are reasonably expanded based on actual on-site requirements to adapt to the retrofitting needs of different specifications of horizontal rolling mills. Specific steps are as follows: Step 1: Equipment pretreatment and condition inspection before modification; A comprehensive shutdown inspection was conducted on the horizontal rolling mill stand, with a focus on checking the wear of the arches. The mating clearances of each arch were measured to ensure that the clearances were controlled within 0.1-0.5mm. Any online arches that exceeded the range were replaced. After the spare arches were replenished, the offline arches were sent to the maintenance area for repair. Turn off the main power supply and oil circuit valves of the hydraulic system, release the residual pressure of the clamping system (pressure drops to 0-0.5MPa), remove the protective components around the cylinder, and clean the oil stains, iron filings and impurities from the frame mounting surface; The roundness and cylindricity of the cylinder mounting holes are tested using a dial indicator. The roundness deviation is ≤0.2-0.8mm and the cylindricity deviation is ≤0.3-1.0mm. Severely worn mounting holes are repaired and polished to ensure the assembly accuracy of subsequent split-type cylinders. Step 2: Disassembly and surface preparation of the old-style embedded hydraulic cylinder; Remove the fixing bolts and hydraulic pipe joints of the embedded cylinder in sequence, and record the position and direction of the oil pipe connection to avoid subsequent assembly errors; use a special lifting tool to steadily remove the old cylinder and place it in the designated maintenance area to avoid collision damage; Use a high-pressure cleaner with a neutral cleaning agent to thoroughly clean the inner wall of the cylinder mounting hole and the mating surface of the frame, removing rust, oil, and sealant residue. The cleaning area should cover the full depth of the mounting hole and the surrounding 10-30mm area of ​​the mating surface. Grind the inner wall of the mounting hole to ensure a surface roughness Ra≤1.6-3.2μm. After wiping it clean with a lint-free cloth, apply a layer of anti-rust grease evenly to the mating surface to provide protection and lubrication for the assembly of the split-type hydraulic cylinder. Step 3: Selection and precise assembly of split-type hydraulic cylinders; Select a split-type hydraulic cylinder that matches the specifications of the mounting holes on the frame. The clearance between the cylinder body and the piston is controlled within 0.05-0.20mm. The seals are made of high-pressure resistant and wear-resistant materials to ensure compatibility with the working pressure of the hydraulic system. The split-type hydraulic cylinder is slowly fed into the mounting hole using a lifting tool. The position of the hydraulic cylinder is adjusted to ensure that the coaxiality deviation between the hydraulic cylinder axis and the mounting hole axis is ≤0.2-0.8mm, and the cylinder end face is in close contact with the frame contact surface with a flatness deviation of ≤0.3-1.2mm. Use high-strength bolts to symmetrically tighten the cylinder fixing flange, controlling the tightening torque at 50-85 N·m, and tighten evenly in three stages to avoid uneven local stress that could cause cylinder deformation; connect the hydraulic oil pipes, ensuring that the joints are properly sealed and there is no risk of leakage. Step 4: Design of the new valve block and pretreatment of the mounting surface; A new valve block was designed based on the pressure requirements of the clamping system. The internal flow channel of the valve block is adapted to the opening and closing flow of the hydraulic cylinder, and a pressure adjustment interface is reserved to ensure that the pressure in the opening direction of the clamping cylinder can be stably adjusted to 140-160 kgf / cm². 2 The clamping pressure is maintained at 75-85 kgf / cm. 2 ; Clean the original valve platform mounting surface of the rolling mill to remove oil stains, bolt residue and oxide layer, and ensure that the flatness deviation of the mounting surface is ≤0.3-1.0mm. Use a spirit level to calibrate the levelness of the mounting surface, and the levelness deviation is ≤0.2-0.6mm / m. Measure the spacing and diameter of the valve mounting holes, match the position of the fixing holes of the newly added valve block, and ensure that the hole position deviation is ≤0.2-0.7mm, so as to provide a basis for the precise alignment of the valve block; Step 5: Precisely align and securely install the new valve block; Using a dial indicator for assisted positioning, the new valve block is fitted to the valve seat mounting surface. The position of the valve block is adjusted to ensure that the coaxiality deviation between the oil inlet and outlet of the valve block and the original pipeline interface is ≤0.2-0.8mm, and the flow channel is aligned without offset. The valve block is temporarily fixed with a locating pin. The fit gap between the valve block and the valve seat is checked. The gap value is ≤0.1-0.4mm, and the circumferential gap is uniform with no warping or hanging. Install and fix the bolts and tighten them symmetrically, with the tightening torque controlled at 35-60 N·m, to ensure that the valve block and valve seat fit tightly without loosening or displacement; use a torque wrench to tighten the joints of the hydraulic oil pipes connecting the valve block and the clamping cylinder, with a tightening torque of 15-30 N·m, to prevent leakage. Step 6: Hydraulic system pressure adjustment and motion test; Turn on the hydraulic system power and slowly increase the pressure to the working pressure range. Set the parameters through the valve block pressure adjustment interface: first adjust the clamping directional pressure to 75-85 kgf / cm². 2 Then adjust the opening direction pressure to 140-160 kgf / cm. 2 After the pressure stabilizes, maintain the pressure for 30-60 seconds; Start the automatic opening and closing test of the clamping cylinder, operate continuously for 5-10 times, observe whether the cylinder movement is smooth, without jamming or abnormal noise, and control the opening and closing time of each operation to 3-8 seconds. Check the stroke accuracy of the clamping cylinder, and the stroke deviation should be ≤0.5-1.5mm. Simulate roller and trough changing conditions to test the coordination of continuous operation of multiple frames. Focus on verifying the opening and closing status of clamping cylinders on frames 3, 5, 7, and 9 that are prone to failure, to ensure that there are no cases where they cannot be opened automatically. Step 7: Repositioning the archway and verifying the overall process; The repaired spare archway or new archway is precisely installed and repositioned, and the archway fixing bolts are tightened to ensure that the fit gap between the archway and the frame is uniform and ≤0.1-0.5mm. The overall rigidity of the frame is checked and there is no loosening or deformation. Step 701: Conduct a comprehensive test on the modified system: Use a pressure sensor to monitor the stability of the valve block's working pressure; the pressure fluctuation should be ≤ ±5 kgf / cm² within 30 minutes. 2 The hydraulic cylinder and valve block connection pipeline was checked with a leakage detector, and no hydraulic oil leakage was found. Step 702: Record key modification parameters: cylinder model, valve block specifications, pressure setting value, and installation clearance data to form a modification log for reference in subsequent maintenance; clean up tools and debris on site and complete process acceptance. Furthermore, this process enables the clamping cylinder to open and close automatically and smoothly, completely resolving the core fault: By modifying the embedded hydraulic cylinder into a split structure, this process eliminates the additional force exerted on the hydraulic cylinder by the wear and deformation of the mounting hole, combined with the precise alignment and pressure optimization of the newly added valve block (opening direction pressure 140-160 kgf / cm²). 2 Clamping directional pressure 75-85 kgf / cm 2 This technology enables the automatic and smooth opening and closing of the clamping cylinder, completely eliminating the problem of the clamping cylinder not being able to open automatically in the traditional process, eliminating the need for manual pump operation, and fundamentally solving the potential for production interruption. Furthermore, this process shortens the roller and slot change time and improves production continuity: after modification, the clamping cylinder opens and closes automatically without the need for professional personnel to follow up, which greatly simplifies the roller and slot change process and effectively shortens the time of a single operation; at the same time, it avoids production stoppages caused by clamping failures. According to relevant material data, it can significantly reduce the time of such accidents (the original cumulative accident time reached 280 minutes / year), and greatly improve the continuity and overall efficiency of high-speed production. Furthermore, this process reduces labor intensity and maintenance costs: the automated opening and closing function completely changes the traditional operation mode that relies on manual pressurization, alleviating the predicament of needing daytime professional personnel to support the night shift, and significantly reducing the labor intensity of the staff; the split-type hydraulic cylinder structure makes it easy to disassemble and repair individually without disassembling the entire frame, and with the archway repair and reuse strategy, it reduces the frequency of spare parts replacement, greatly saving spare parts procurement costs and equipment maintenance costs (saving about 120,000 yuan per unit). Furthermore, this process boasts high assembly precision and strong operational stability: precise parameter control standards are clearly defined for each stage of the process (coaxiality deviation of the hydraulic cylinder ≤ 0.2-0.8mm, coaxiality deviation of the valve block flow channel ≤ 0.2-0.8mm). Through full-process control including pre-treatment testing, precise assembly, and debugging verification, the installation accuracy of the split hydraulic cylinder and the newly added valve block is guaranteed. The selection of high-pressure and wear-resistant seals and the design for stable pressure regulation reduce wear and leakage risks during equipment operation, extend the service life of the clamping system, and reduce the frequency of failure recurrence. Furthermore, this process is widely adaptable and highly replicable: all key parameters are reasonably expanded based on actual on-site operational needs (fitting gap 0.1-0.5mm, tightening torque 35-85N・m), which can adapt to the modification needs of different specifications of horizontal rolling mills; the standardized process of "pre-treatment-dismantling-modification and assembly-valve block alignment-debugging and verification", coupled with clear testing standards and operating procedures, reduces the dependence on the skill level of operators, making it easy to promote and apply in batches in similar horizontal rolling mill equipment, and has extremely strong practical value and replicability; Furthermore, this process improves the overall precision of the equipment and ensures production quality: through a series of improvements such as archway repair and replacement, mounting surface grinding, and precise alignment of the cylinder and valve block, not only was the opening and closing failure of the clamping cylinder resolved, but the overall fit precision of the frame was also optimized, reducing vibration and deviation during equipment operation, and providing a reliable guarantee for the product quality stability of high-speed wire rod production. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A process for retrofitting a split-type hydraulic cylinder and aligning a new valve block in a horizontal rolling mill, comprising: Step 1: pre-processing and condition inspection of the equipment before retrofitting; Step 2: disassembly and surface treatment of the old-type embedded hydraulic cylinder; Step 3: selection and precise assembly of the split-type hydraulic cylinder; Step 4: design and pre-processing of the new valve block; Step 5: precise alignment and fixed installation of the new valve block; Step 6: hydraulic system pressure debugging and action testing; Step 7: gate resetting and overall process verification, characterized in that: Step 7: Archway Reset and Overall Process Verification includes step 701 conducting a comprehensive inspection of the modified system and step 702 recording key modification parameters.

2. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 1: Equipment pretreatment and condition detection before modification; A comprehensive shutdown inspection was conducted on the horizontal rolling mill stand, with a focus on checking the wear of the arches. The mating clearances of each arch were measured to ensure that the clearances were controlled within 0.1-0.5mm. Any online arches that exceeded the range were replaced. After the spare arches were replenished, the offline arches were sent to the maintenance area for repair. Turn off the main power supply and oil circuit valves of the hydraulic system, release the residual pressure of the clamping system (pressure drops to 0-0.5MPa), remove the protective components around the cylinder, and clean the oil stains, iron filings and impurities from the frame mounting surface; The roundness and cylindricity of the cylinder mounting holes are tested using a dial indicator. The roundness deviation is ≤0.2-0.8mm and the cylindricity deviation is ≤0.3-1.0mm. Severely worn mounting holes are repaired and polished to ensure the assembly accuracy of subsequent split-type cylinders.

3. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 2: Disassembly and surface treatment of the old-type embedded hydraulic cylinder; Remove the fixing bolts and hydraulic pipe joints of the embedded cylinder in sequence, and record the position and direction of the oil pipe connection to avoid subsequent assembly errors; use a special lifting tool to steadily remove the old cylinder and place it in the designated maintenance area to avoid collision damage; Use a high-pressure cleaner with a neutral cleaning agent to thoroughly clean the inner wall of the cylinder mounting hole and the mating surface of the frame, removing rust, oil, and sealant residue. The cleaning area should cover the full depth of the mounting hole and the surrounding 10-30mm area of ​​the mating surface. The inner wall of the mounting hole is ground to ensure a surface roughness Ra≤1.6-3.2μm. After wiping it clean with a lint-free cloth, a layer of anti-rust grease is evenly applied to the mating surface to provide protection and lubrication for the assembly of the split-type hydraulic cylinder.

4. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 3: Selection and precise assembly of split-type hydraulic cylinders; Select a split-type hydraulic cylinder that matches the specifications of the mounting holes on the frame. The clearance between the cylinder body and the piston is controlled within 0.05-0.20mm. The seals are made of high-pressure resistant and wear-resistant materials to ensure compatibility with the working pressure of the hydraulic system. The split-type hydraulic cylinder is slowly fed into the mounting hole using a lifting tool. The position of the hydraulic cylinder is adjusted to ensure that the coaxiality deviation between the hydraulic cylinder axis and the mounting hole axis is ≤0.2-0.8mm, and the cylinder end face is in close contact with the frame contact surface with a flatness deviation of ≤0.3-1.2mm. Use high-strength bolts to symmetrically tighten the cylinder fixing flange, controlling the tightening torque to 50-85 N·m, and tighten evenly in three stages to avoid uneven local stress that could cause cylinder deformation; connect the hydraulic oil pipes, ensuring that the joints are properly sealed and there is no risk of leakage.

5. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 4: Design of the new valve block and pretreatment of the mounting surface; A new valve block was designed based on the pressure requirements of the clamping system. The internal flow channel of the valve block is adapted to the opening and closing flow of the hydraulic cylinder, and a pressure adjustment interface is reserved to ensure that the pressure in the opening direction of the clamping cylinder can be stably adjusted to 140-160 kgf / cm². 2 The clamping pressure is maintained at 75-85 kgf / cm. 2 ; Clean the original valve platform mounting surface of the rolling mill to remove oil stains, bolt residue and oxide layer, and ensure that the flatness deviation of the mounting surface is ≤0.3-1.0mm. Use a spirit level to calibrate the levelness of the mounting surface, and the levelness deviation is ≤0.2-0.6mm / m. Measure the spacing and diameter of the valve mounting holes, match the position of the fixing holes of the newly added valve block, and ensure that the hole position deviation is ≤0.2-0.7mm, so as to provide a basis for the precise alignment of the valve block.

6. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 5: Precisely align and securely install the new valve block; Using a dial indicator for assisted positioning, the new valve block is fitted to the valve seat mounting surface. The position of the valve block is adjusted to ensure that the coaxiality deviation between the oil inlet and outlet of the valve block and the original pipeline interface is ≤0.2-0.8mm, and the flow channel is aligned without offset. The valve block is temporarily fixed with a locating pin. The fit gap between the valve block and the valve seat is checked. The gap value is ≤0.1-0.4mm, and the circumferential gap is uniform with no warping or hanging. Install and fix the bolts and tighten them symmetrically, with the tightening torque controlled at 35-60 N·m to ensure that the valve block and valve seat fit tightly without loosening or displacement; use a torque wrench to tighten the joints of the hydraulic oil pipes connecting the valve block and the clamping cylinder, with a tightening torque of 15-30 N·m to avoid leakage.

7. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 6: Hydraulic system pressure adjustment and motion test; Turn on the hydraulic system power and slowly increase the pressure to the working pressure range. Set the parameters through the valve block pressure adjustment interface: first adjust the clamping directional pressure to 75-85 kgf / cm². 2 Then adjust the opening direction pressure to 140-160 kgf / cm. 2 After the pressure stabilizes, maintain the pressure for 30-60 seconds; Start the automatic opening and closing test of the clamping cylinder, operate continuously for 5-10 times, observe whether the cylinder movement is smooth, without jamming or abnormal noise, and control the opening and closing time of each operation to 3-8 seconds. Check the stroke accuracy of the clamping cylinder, and the stroke deviation should be ≤0.5-1.5mm. Simulate roller and trough changing conditions to test the coordination of continuous operation of multiple frames. Focus on verifying the opening and closing status of the clamping cylinders of frames 3, 5, 7, and 9 that are prone to failure, to ensure that there are no cases where the cylinders cannot be opened automatically.

8. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 7: Repositioning the archway and verifying the overall process; The repaired spare archway or new archway is precisely installed and reset, and the archway fixing bolts are tightened to ensure that the fit between the archway and the frame is uniform and ≤0.1-0.5mm. The overall rigidity of the frame is checked and there is no loosening or deformation.

9. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 701 involves a comprehensive test of the modified system: a pressure sensor is used to monitor the stability of the valve block's working pressure; the pressure fluctuation within 30 minutes is ≤ ±5 kgf / cm². 2 The hydraulic cylinder and valve block connection pipeline was checked with a leakage detector, and no hydraulic oil leakage was found.

10. The process for modifying a split-type hydraulic cylinder and aligning a newly added valve block in a horizontal rolling mill according to claim 1, characterized in that: Step 702 records key modification parameters: cylinder model, valve block specifications, pressure setting value, and installation clearance data, forming a modification log to provide a reference for subsequent maintenance; cleans up on-site tools and debris, and completes process acceptance.