Hydraulic pipe clamp bolt pressure plate tooth engagement anti-loosening process

Abstract

The present application relates to the technical field of metallurgical machinery, and discloses a hydraulic pipeline gripper bolt pressing plate tooth shape engagement anti-loosening process, which comprises the following steps: step one, process preparation and component selection adaptation; step two, precise machining of the tooth shape structure of the bolt and the pressing plate; step three, pretreatment of the tooth shape component; step four, pre-engagement assembly of the bolt and the pressing plate; step five, positioning assembly of the gripper and the hydraulic pipeline; step six, precise pretightening fixation of the tooth shape engagement; step seven, working condition simulation anti-loosening performance detection; step eight, finished product protection and on-site fixation; and step nine, on-site inspection reference setting. The process realizes multidirectional mechanical anti-loosening, and completely solves the problem of bolt loosening under strong vibration. The tooth shape engagement structure of the bolt and the pressing plate upgrades the traditional friction force anti-loosening to mechanical engagement anti-loosening. The interlocking constraint of the tooth shape engagement surface under the multi-directional vibration and impact of the rolling mill can effectively prevent bolt rotation and jumping.

Description

Technical Field

[0001] This invention relates to the field of metallurgical machinery technology, specifically to a hydraulic pipeline clamp bolt pressure plate toothed engagement anti-loosening process. Background Technology

[0002] The hydraulic system of a rolling mill is the core power unit for controlling rolling force and position accuracy in metallurgical production. Hydraulic steel pipes with diameters from DN10 to DN80 are responsible for transporting high-pressure oil, and their clamping and fixing reliability directly determines the stable operation of the hydraulic system and even the entire rolling line. As a core component for pipe fixing, the hydraulic pipe clamp typically uses a bolt-plate structure to clamp the pipe. Under normal operating conditions, this meets basic fixing requirements. However, in actual rolling mill production scenarios, it faces extremely harsh operating conditions: the rolling process generates high-frequency vibrations of 20-50Hz, with vibration accelerations reaching 5-10 m / s². 2 At the same time, the rolling load impact of more than 1000kN is also present, and the oil pressure fluctuation inside the hydraulic system will further aggravate the resonance effect of the clamping part.

[0003] Currently, the industry commonly uses traditional methods such as spring washers and double-nut locking to prevent loosening of clamp bolts. These anti-loosening structures rely solely on friction to achieve unidirectional anti-loosening and cannot cope with the multi-directional, high-frequency vibrations and impacts of rolling mills. In actual production scenarios, hydraulic pipe clamps using traditional anti-loosening methods generally experience a bolt preload torque attenuation rate exceeding 10% after 30-45 days of continuous operation. Under some heavy vibration conditions, bolts even rotate and pressure plates loosen, leading to relative displacement between the hydraulic pipe and the clamp, and wear and leakage on the outer wall of the pipe due to repeated friction. Hydraulic oil leakage not only causes a sudden drop in hydraulic system oil pressure, leading to rolling accuracy deviations and production stoppages, but also pollutes the on-site environment with oil, posing safety hazards such as equipment lubrication failure and electrical short circuits. At the same time, frequent bolt tightening and pipe maintenance significantly increase production and maintenance costs, becoming a key bottleneck restricting the long-term stable operation of the rolling mill hydraulic system. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a hydraulic pipe clamp bolt pressure plate toothed engagement anti-loosening process, which has multi-directional mechanical anti-loosening capabilities and completely solves the problems of bolt rotation and pressure plate loosening.

[0005] (II) Technical Solution To achieve the aforementioned multi-directional mechanical anti-loosening and completely solve the problem of bolt loosening under strong vibration, this invention provides the following technical solution: a hydraulic pipeline clamp bolt pressure plate toothed meshing anti-loosening process, including step one: process preparation and component selection and adaptation; step two: precise machining of the toothed structure of the bolt and pressure plate; step three: pre-treatment of the toothed components; step four: pre-meshing assembly of the bolt and pressure plate; step five: positioning assembly of the clamp and hydraulic pipeline; step six: precise pre-tightening and fixing of the toothed meshing; step seven: working condition simulation anti-loosening performance testing; step eight: finished product protection and on-site fixing; and step nine: on-site inspection benchmark setting. Step one: process preparation and component selection and adaptation; Based on the pipe diameter (DN10~DN80) of the rolling mill's hydraulic system and the intensity of vibration on site, the components were selected. The pressure plate was made of Q235B carbon steel, and the clamping bolts were made of 8.8 grade high-strength carbon steel to ensure that the strength of the components matched the high pressure and strong vibration conditions of the rolling mill. At the same time, the vibration level of the rolling mill was determined. For light vibration (rolling load ≤1000kN), the meshing angle was set to 0~5°; for medium vibration (rolling load 1000~2000kN), the meshing angle was set to 5~10°; and for heavy vibration (rolling load ≥2000kN), the meshing angle was set to 10~15°. Prepare the machining and assembly tools: CNC milling machine, wire cutting machine, torque wrench with an accuracy of ±2%, tooth profile inspection gauge, vibration simulation test bench, 400# metallographic sandpaper. For auxiliary materials, use medium-strength thread locking agent, thin anti-rust grease, and analytical grade anhydrous ethanol. Keep all tools and auxiliary materials clean, free of oil and impurities. The purchased pressure plates and bolt blanks are visually inspected to ensure that there are no cracks, deformations, or missing materials, that the bolt threads are free of stripping or irregular threads, and that the flatness of the pressure plate mounting surface is ≤0.03mm.

[0006] Preferably, step two involves precise machining of the toothed structure of the bolts and pressure plates; The meshing teeth are machined on the mating surface of the pressure plate opposite the bolt using a CNC milling machine. At the same time, matching meshing teeth are machined on the end of the clamping bolt. The tooth profile is uniformly set with a module of 1.5~2.0mm, a tooth height of 2~3mm, and a tooth pitch of 3~4mm. The surface roughness of the tooth profile Ra≤1.6μm. After machining, there should be no burrs, missing teeth, or tooth tip chipping. The meshing surface fit of the tooth profile must be ≥95%. Based on the mill vibration level determined in step one, the meshing angle of the tooth engagement direction is processed by a wire EDM machine. Light vibration processes a 3° meshing angle, medium vibration processes an 8° meshing angle, and heavy vibration processes a 12° meshing angle, ensuring that the angle deviation is ≤ ±0.5° and there is no skew. The machined bolts and pressure plates are quenched to achieve a surface hardness of HRC40~45, which improves the wear resistance and impact resistance of the teeth and prevents wear caused by long-term vibration.

[0007] Preferably, step three involves the pretreatment of the toothed components. Use 400# metallographic sandpaper to gently sand the toothed surface of the bolts and pressure plates along the toothed pattern to remove burrs, flash, and metal debris generated during processing. After sanding, the surface should feel smooth to the touch. Use a dust-free cleaning cloth soaked in analytical grade anhydrous ethanol to repeatedly wipe the bolt tooth surface, thread surface, pressure plate tooth surface, and mounting surface to remove surface oil and iron filings. After wiping, place the parts in a dry environment at room temperature to air dry naturally for no less than 3 minutes. Do not blow air or heat to accelerate drying. Apply a thin, even layer of anti-rust grease to the toothed meshing surfaces of the bolt and the pressure plate, with a coating amount ≤0.2g / cm². 2 To avoid excessive grease buildup affecting the meshing accuracy of the bolt teeth, apply a medium-strength thread-locking agent to the threaded portion of the bolt, covering an area of ​​1 / 2 of the effective thread length, to achieve auxiliary anti-loosening of the thread layer.

[0008] Preferably, step four involves the pre-engagement assembly of the bolts and the pressure plate. The lower plane of the pressure plate is initially fixed to the non-toothed end of the clamping bolt. A square is used to check the perpendicularity of the pressure plate and the bolt to ensure that the perpendicularity is ≤0.05mm, with no skewing or warping, to prevent uneven force during subsequent meshing. Engage the toothed surface on the upper part of the pressure plate with the toothed surface at the end of the bolt. During engagement, slowly rotate the bolt clockwise to ensure that the tooth tip and tooth root are fully engaged, without any tooth tip jamming or excessive tooth side clearance. If poor engagement occurs, the toothed surface needs to be sanded again to meet the requirements. After pre-engagement is completed, gently shake the bolt and pressure plate assembly to check that there is no separation or loosening at the toothed engagement point and that the overall assembly is firmly connected. Do not apply any additional tightening force after pre-engagement is completed, and wait for use.

[0009] Preferably, step five involves the positioning and assembly of the clamp and the hydraulic pipeline. Based on the actual diameter of the hydraulic steel pipe, select a suitable clamping slot, place the hydraulic steel pipe stably in the center of the clamping slot, use a level to check the pipe's levelness, and ensure that the coaxiality between the pipe and the clamping slot is ≤0.1mm to avoid uneven clamping force caused by uneven pipe loading. Install the pre-engaged bolt-plate assembly on the holder's fixed seat, manually adjust the position of the plate so that the arc-shaped contact surface of the plate is completely in contact with the outer wall of the pipe, with no gaps or local suspensions between the plate and the pipe, ensuring that the clamping surface is evenly stressed. Adjust the installation position of the clamp to ensure that it does not interfere with other equipment in the rolling mill, while ensuring that the pipeline layout meets the design requirements of the rolling mill hydraulic system, and reserve sufficient working space for subsequent fastening operations.

[0010] Preferably, step six involves precise pre-tightening and fixing of the toothed meshing; Use a torque wrench with an accuracy of ±2%, and match the corresponding preload torque according to the hydraulic pipeline diameter: DN10~20 is 25±2N・m, DN25~40 is 35±2N・m, DN45~60 is 45±2N・m, and DN65~80 is 55±2N・m. Slowly and evenly apply force to tighten the bolt along the direction of tooth engagement until the bolt and the teeth of the pressure plate are fully engaged and locked. Avoid applying force during the tightening process to prevent the teeth from cracking or the bolt from deforming. After tightening, use a toothed gauge to check the toothed meshing area to confirm that the teeth are not separated or misaligned. At the same time, shake the pipe by hand to check that the pipe is not displaced or loose, that the clamping force of the pressure plate on the pipe is uniform, and that there is no squeezing deformation on the outer wall of the pipe.

[0011] Preferably, step seven involves: testing the anti-loosening performance under simulated working conditions; The assembled pipe-clamp assembly was placed on a vibration simulation test bench to simulate the vibration parameters of an actual rolling mill: vibration frequency 20~50Hz, vibration acceleration 5~10m / s². 2 The vibration test was conducted continuously for 2 hours. During the vibration test, observe in real time whether the bolts rotate or jump, and whether there are signs of separation at the tooth meshing. If no such phenomena occur during the test, it is considered to be preliminarily qualified. After the test, use a torque wrench to check the pre-tightening torque of the bolts again. The torque attenuation rate should be ≤3%. At the same time, check the relative position of the pipe and the clamp. If there is no displacement or loosening, and the toothed meshing surface is not worn, the anti-loosening performance is up to standard. If the torque attenuation rate exceeds the standard or loosening occurs, it is necessary to retighten and check the toothed meshing state. If necessary, replace the toothed parts.

[0012] Preferably, step eight is: finished product protection and on-site fixation; For clamping components that pass the anti-loosening performance test, apply a thin layer of anti-rust grease evenly to the bolt ends, the outer side of the pressure plate, and the exposed parts of the toothed meshing area. The grease thickness should be ≤0.05mm to prevent the anti-rust grease from entering the toothed meshing surface and affecting the anti-loosening effect. After the clamps have been assembled and debugged, fix them according to the on-site pipe layout position of the rolling mill hydraulic system. Use expansion bolts to firmly connect the clamp base to the installation foundation to ensure that the clamps and the foundation are not loose. After installation, re-check the bolt pre-tightening torque to ensure that the torque value meets the process requirements. A comprehensive inspection was conducted on the hydraulic pipelines after on-site installation to confirm that the pipelines were free from bends and compression, that the clamps did not interfere with surrounding equipment, and that the pipeline locations in concealed areas were clearly marked for easy inspection later.

[0013] Preferably, step nine: setting on-site inspection standards; The daily inspection cycle of the rolling mill is set to once a month. During the inspection, only the pre-tightening torque of the clamp bolts needs to be checked with a torque wrench. There is no need to disassemble the toothed meshing structure of the bolt pressure plate, thus avoiding repeated disassembly and tooth wear. During the inspection, if a slight decrease in the bolt preload torque is found, tighten it to the standard torque corresponding to the pipe diameter; if the inspection finds obvious wear at the tooth meshing, stripped bolt threads, or deformation of the pressure plate, the bolt-pressure plate assembly should be replaced in time to ensure the continuous and stable anti-loosening effect. Establish an inspection record log to record the torque value and clamp status for each inspection. For clamps operating under heavy vibration conditions in rolling mills, appropriately shorten the inspection cycle to once every 20 days.

[0014] (III) Beneficial Effects Compared with the prior art, the present invention provides a toothed engagement anti-loosening process for the bolt pressure plate of a hydraulic pipe clamp, which has the following beneficial effects: 1. This hydraulic pipe clamp bolt pressure plate toothed engagement anti-loosening technology achieves multi-directional mechanical anti-loosening, completely solving the problem of bolt loosening under strong vibration. This technology upgrades traditional friction-based anti-loosening to mechanical engagement through the toothed engagement structure between the bolt and the pressure plate. The toothed engagement surfaces form an interlocking bundle under multi-directional vibration impact from the rolling mill, effectively preventing bolt rotation and jump. Simultaneously, a 0~15° engagement angle design adapted to the rolling mill vibration level further enhances the impact resistance of the toothed engagement, providing protection against high-frequency vibrations of 20~50Hz and vibrations of 5~10m / s. 2 Under vibration and acceleration conditions, the bolt preload torque attenuation rate can be controlled at ≤3%, which is far better than the attenuation rate of more than 10% of traditional anti-loosening methods, thus avoiding the problem of loosening of clamp bolts from the root.

[0015] 2. The hydraulic pipe clamp bolt pressure plate toothed meshing anti-loosening process achieves precise parameter matching and processing control, ensuring the stability of clamping and anti-loosening. This process sets differentiated pre-tightening torques for hydraulic pipes of different diameters (25±2N・m for DN10~20 to 55±2N・m for DN65~80). At the same time, it strictly controls the tooth processing parameters (module 1.5~2.0mm, tooth height 2~3mm, tooth pitch 3~4mm) and meshing angle deviation (≤±0.5°). The tooth meshing surface fit is ≥95%, ensuring that the clamping force is evenly distributed on the outer wall of the pipe and avoiding local extrusion deformation. The tooth surface is quenched to HRC40~45, which improves the wear resistance of the tooth and can resist the wear caused by vibration and impact for a long time, ensuring the long-term effectiveness of the anti-loosening structure.

[0016] 3. The hydraulic pipeline clamp bolt pressure plate toothed engagement anti-loosening technology achieves a dual anti-loosening mechanism, improving the reliability of anti-loosening. Based on the toothed mechanical anti-loosening, this technology is supplemented by applying medium-strength thread-locking agent to the bolt thread, forming a dual anti-loosening structure of "toothed engagement + thread locking". It achieves primary anti-loosening through mechanical engagement and secondary anti-loosening through thread-locking agent, further reducing the risk of bolt loosening. At the same time, the toothed engagement structure does not require additional complex auxiliary components, simplifying the assembly process and avoiding the problem of fatigue failure of traditional anti-loosening components (spring washers), thus improving the overall reliability of the anti-loosening structure.

[0017] 4. The hydraulic pipe clamp bolt pressure plate toothed engagement anti-loosening process implements a standardized testing and inspection system, ensuring convenient and long-term operation and maintenance. This process uses a vibration simulation test bench to simulate the actual working conditions of a rolling mill, conducting a 2-hour vibration test on the assembled clamp to verify the anti-loosening performance and ensure factory quality. At the same time, a standardized on-site inspection system has been established. Routine inspections only require checking the bolt preload torque, without disassembling the toothed engagement structure, avoiding tooth wear caused by repeated disassembly. For heavy vibration conditions, the inspection cycle can be shortened to 20 days, ensuring both convenient operation and maintenance and timely detection of potential problems, ensuring long-term stable anti-loosening effect.

[0018] 5. The hydraulic pipe clamp bolt pressure plate toothed engagement anti-loosening technology reduces production and maintenance costs and eliminates safety hazards. This technology can extend the anti-loosening failure period of the hydraulic pipe clamp from the traditional 30-45 days to more than 180 days, significantly reducing the frequency of bolt tightening and pipe maintenance, and lowering labor and material maintenance costs. At the same time, it completely avoids hydraulic oil leakage problems, eliminates oil pollution, equipment lubrication failure, and electrical short circuit safety hazards, ensures the stable operation of the rolling mill hydraulic system, and improves the continuity and safety of metallurgical production. Detailed Implementation

[0019] 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.

[0020] This solution provides a technical solution, specifically a hydraulic pipeline clamp bolt pressure plate toothed engagement anti-loosening process, including the following steps: Step 1: Process preparation and component selection and matching; Based on the pipe diameter (DN10~DN80) of the rolling mill's hydraulic system and the intensity of vibration on site, the components were selected. The pressure plate was made of Q235B carbon steel, and the clamping bolts were made of 8.8 grade high-strength carbon steel to ensure that the strength of the components matched the high pressure and strong vibration conditions of the rolling mill. At the same time, the vibration level of the rolling mill was determined. For light vibration (rolling load ≤1000kN), the meshing angle was set to 0~5°; for medium vibration (rolling load 1000~2000kN), the meshing angle was set to 5~10°; and for heavy vibration (rolling load ≥2000kN), the meshing angle was set to 10~15°. Prepare the machining and assembly tools: CNC milling machine, wire cutting machine, torque wrench with an accuracy of ±2%, tooth profile inspection gauge, vibration simulation test bench, 400# metallographic sandpaper. For auxiliary materials, use medium-strength thread locking agent, thin anti-rust grease, and analytical grade anhydrous ethanol. Keep all tools and auxiliary materials clean, free of oil and impurities. The purchased pressure plates and bolt blanks are visually inspected to ensure that there are no cracks, deformations, or missing materials, that the bolt threads are free of stripping or cross-threading, and that the flatness of the pressure plate mounting surface is ≤0.03mm. Step 2: Precision machining of the toothed structure of the bolts and pressure plate; The meshing teeth are machined on the mating surface of the pressure plate opposite the bolt using a CNC milling machine. At the same time, matching meshing teeth are machined on the end of the clamping bolt. The tooth profile is uniformly set with a module of 1.5~2.0mm, a tooth height of 2~3mm, and a tooth pitch of 3~4mm. The surface roughness of the tooth profile Ra≤1.6μm. After machining, there should be no burrs, missing teeth, or tooth tip chipping. The meshing surface fit of the tooth profile must be ≥95%. Based on the mill vibration level determined in step one, the meshing angle of the tooth engagement direction is processed by a wire EDM machine. Light vibration processes a 3° meshing angle, medium vibration processes an 8° meshing angle, and heavy vibration processes a 12° meshing angle, ensuring that the angle deviation is ≤ ±0.5° and there is no skew. The machined bolts and pressure plates are quenched to achieve a surface hardness of HRC40~45, which improves the wear resistance and impact resistance of the teeth and prevents wear caused by long-term vibration. Step 3: Pre-treatment of toothed parts; Use 400# metallographic sandpaper to gently sand the toothed surface of the bolts and pressure plates along the toothed pattern to remove burrs, flash, and metal debris generated during processing. After sanding, the surface should feel smooth to the touch. Use a dust-free cleaning cloth soaked in analytical grade anhydrous ethanol to repeatedly wipe the bolt tooth surface, thread surface, pressure plate tooth surface, and mounting surface to remove surface oil and iron filings. After wiping, place the parts in a dry environment at room temperature to air dry naturally for no less than 3 minutes. Do not blow air or heat to accelerate drying. Apply a thin, even layer of anti-rust grease to the toothed meshing surfaces of the bolt and the pressure plate, with a coating amount ≤0.2g / cm². 2To avoid excessive grease buildup affecting the meshing accuracy of the bolt teeth; apply medium-strength thread-locking agent to the threaded part of the bolt, covering an area of ​​1 / 2 of the effective thread length, to achieve auxiliary anti-loosening of the thread layer; Step 4: Pre-engagement assembly of bolts and pressure plates; The lower plane of the pressure plate is initially fixed to the non-toothed end of the clamping bolt. A square is used to check the perpendicularity of the pressure plate and the bolt to ensure that the perpendicularity is ≤0.05mm, with no skewing or warping, to prevent uneven force during subsequent meshing. Engage the toothed surface on the upper part of the pressure plate with the toothed surface at the end of the bolt. During engagement, slowly rotate the bolt clockwise to ensure that the tooth tip and tooth root are fully engaged, without any tooth tip jamming or excessive tooth side clearance. If poor engagement occurs, the toothed surface needs to be sanded again to meet the requirements. After pre-engagement is completed, gently shake the bolt and pressure plate assembly to check that there is no separation or looseness at the toothed engagement point and that the overall connection of the assembly is firm. Do not apply any additional tightening force after pre-engagement is completed; keep it ready for use. Step 5: Positioning and assembling the clamp and hydraulic lines; Based on the actual diameter of the hydraulic steel pipe, select a suitable clamping slot, place the hydraulic steel pipe stably in the center of the clamping slot, use a level to check the pipe's levelness, and ensure that the coaxiality between the pipe and the clamping slot is ≤0.1mm to avoid uneven clamping force caused by uneven pipe loading. Install the pre-engaged bolt-plate assembly on the holder's fixed seat, manually adjust the position of the plate so that the arc-shaped contact surface of the plate is completely in contact with the outer wall of the pipe, with no gaps or local suspensions between the plate and the pipe, ensuring that the clamping surface is evenly stressed. Adjust the installation position of the clamp to ensure that it does not interfere with other equipment in the rolling mill, while ensuring that the pipe layout position meets the design requirements of the rolling mill hydraulic system, and reserve sufficient working space for subsequent fastening operations; Step Six: Precise pre-tightening and fixing of the toothed mesh; Use a torque wrench with an accuracy of ±2%, and match the corresponding preload torque according to the hydraulic pipeline diameter: DN10~20 is 25±2N・m, DN25~40 is 35±2N・m, DN45~60 is 45±2N・m, and DN65~80 is 55±2N・m. Slowly and evenly apply force to tighten the bolt along the direction of tooth engagement until the bolt and the teeth of the pressure plate are fully engaged and locked. Avoid applying force during the tightening process to prevent the teeth from cracking or the bolt from deforming. After tightening, use a toothed gauge to check the toothed meshing area to confirm that the teeth are not separated or misaligned. At the same time, shake the pipe by hand to check that the pipe is not displaced or loose, that the clamping force of the pressure plate on the pipe is uniform, and that there is no extrusion deformation on the outer wall of the pipe. Step 7: Working condition simulation and anti-loosening performance test; The assembled pipe-clamp assembly was placed on a vibration simulation test bench to simulate the vibration parameters of an actual rolling mill: vibration frequency 20~50Hz, vibration acceleration 5~10m / s². 2 The vibration test was conducted continuously for 2 hours. During the vibration test, observe in real time whether the bolts rotate or jump, and whether there are signs of separation at the tooth meshing. If no such phenomena occur during the test, it is considered to be preliminarily qualified. After the test, use a torque wrench to check the pre-tightening torque of the bolts again. The torque attenuation rate should be ≤3%. At the same time, check the relative position of the pipe and the clamp. If there is no displacement or loosening, and the toothed meshing surface is not worn, the anti-loosening performance is up to standard. If the torque attenuation rate exceeds the standard or loosening occurs, it is necessary to retighten and check the toothed meshing state. If necessary, replace the toothed parts. Step 8: Protecting and securing the finished product on-site; For clamping components that pass the anti-loosening performance test, apply a thin layer of anti-rust grease evenly to the bolt ends, the outer side of the pressure plate, and the exposed parts of the toothed meshing area. The grease thickness should be ≤0.05mm to prevent the anti-rust grease from entering the toothed meshing surface and affecting the anti-loosening effect. After the clamps have been assembled and debugged, fix them according to the on-site pipe layout position of the rolling mill hydraulic system. Use expansion bolts to firmly connect the clamp base to the installation foundation to ensure that the clamps and the foundation are not loose. After installation, re-check the bolt pre-tightening torque to ensure that the torque value meets the process requirements. Conduct a comprehensive inspection of the hydraulic pipelines after on-site installation to confirm that the pipelines are free from bends and compression, that the clamps do not interfere with surrounding equipment, and that the pipeline locations in concealed areas are clearly marked for easy inspection later. Step Nine: Setting On-site Inspection Standards; The daily inspection cycle of the rolling mill is set to once a month. During the inspection, only the pre-tightening torque of the clamp bolts needs to be checked with a torque wrench. There is no need to disassemble the toothed meshing structure of the bolt pressure plate, thus avoiding repeated disassembly and tooth wear. During the inspection, if a slight decrease in the bolt preload torque is found, tighten it to the standard torque corresponding to the pipe diameter; if the inspection finds obvious wear at the tooth meshing, stripped bolt threads, or deformation of the pressure plate, the bolt-pressure plate assembly should be replaced in time to ensure the continuous and stable anti-loosening effect. Establish an inspection record log to record the torque value and clamp status for each inspection. For clamps operating under heavy vibration conditions in rolling mills, appropriately shorten the inspection cycle to once every 20 days. Furthermore, this process achieves multi-directional mechanical anti-loosening, completely solving the problem of bolt loosening under strong vibration. This process upgrades traditional friction-based anti-loosening to mechanical interlocking anti-loosening through a toothed meshing structure between the bolt and the pressure plate. The toothed meshing surfaces form an interlocking bundle under multi-directional vibration impact from the rolling mill, effectively preventing bolt rotation and jumping. Simultaneously, a 0~15° meshing angle design adapted to the rolling mill vibration level further enhances the impact resistance of the toothed meshing, enabling operation under high-frequency vibration of 20~50Hz and 5~10m / s. 2 Under vibration and acceleration conditions, the bolt preload torque attenuation rate can be controlled at ≤3%, which is far better than the attenuation rate of more than 10% of traditional anti-loosening methods, thus avoiding the problem of loosening of clamp bolts from the root. Furthermore, this process achieves precise parameter matching and processing control, ensuring the stability of clamping and anti-loosening. This process sets differentiated pre-tightening torques for hydraulic pipelines of different diameters (25±2 N·m for DN10~20 to 55±2 N·m for DN65~80), while strictly controlling the tooth profile processing parameters (module 1.5~2.0 mm, tooth height 2~3 mm, tooth pitch 3~4 mm) and meshing angle deviation (≤±0.5°). The tooth profile meshing surface fit is ≥95%, ensuring that the clamping force is evenly distributed on the outer wall of the pipeline and avoiding local extrusion deformation. The tooth profile surface is quenched to HRC40~45, which improves the wear resistance of the tooth profile and can resist the wear caused by vibration and impact for a long time, ensuring the long-term effectiveness of the anti-loosening structure. Furthermore, this process achieves a synergistic dual anti-loosening mechanism, enhancing the reliability of anti-loosening. Based on the toothed mechanical anti-loosening mechanism, this process is supplemented by applying a medium-strength thread-locking agent to the bolt thread, forming a dual anti-loosening structure of "toothed engagement + thread locking". It achieves primary anti-loosening through mechanical engagement and secondary anti-loosening through thread-locking agent, further reducing the risk of bolt loosening. At the same time, the toothed engagement structure does not require additional complex auxiliary components, simplifying the assembly process and avoiding the fatigue failure problem of traditional anti-loosening components (spring washers), thus improving the overall reliability of the anti-loosening structure. Furthermore, this process implements a standardized testing and inspection system, ensuring convenient and long-term operation and maintenance. This process uses a vibration simulation test bench to simulate the actual working conditions of the rolling mill, and conducts a 2-hour vibration test on the assembled clamps to verify the anti-loosening performance and ensure the quality of the products leaving the factory. At the same time, a standardized on-site inspection system has been established. Routine inspections only need to check the bolt preload torque, without disassembling the tooth meshing structure, avoiding tooth wear caused by repeated disassembly. For heavy vibration conditions, the inspection cycle can be shortened to 20 days, which not only ensures convenient operation and maintenance, but also enables the timely detection of potential problems and ensures the long-term stability of the anti-loosening effect. Furthermore, this process reduces production and maintenance costs and eliminates safety hazards. It can extend the anti-loosening failure period of hydraulic pipe clamps from the traditional 30-45 days to more than 180 days, significantly reducing the frequency of bolt tightening and pipe maintenance, and lowering labor and material maintenance costs. At the same time, it completely avoids hydraulic oil leakage problems, eliminates oil pollution, equipment lubrication failure, and electrical short circuit safety hazards, ensures the stable operation of the rolling mill hydraulic system, and improves the continuity and safety of metallurgical 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 hydraulic pipeline clamp bolt pressure plate toothed engagement anti-loosening process, comprising: Step 1: Process preparation and component selection and matching; Step 2: Precise machining of the toothed structure of the bolt and pressure plate; Step 3: Pre-treatment of the toothed components; Step 4: Pre-engagement assembly of the bolt and pressure plate; Step 5: Positioning assembly of the clamp and hydraulic pipeline; Step 6: Precise pre-tightening and fixing of the toothed engagement; Step 7: Working condition simulation anti-loosening performance testing; Step 8: Finished product protection and on-site fixing; and Step 9: On-site inspection benchmark setting. Its key feature is: Step 1: Process preparation and component selection and adaptation; Based on the pipe diameter (DN10~DN80) of the rolling mill's hydraulic system and the intensity of vibration on site, the components were selected. The pressure plate was made of Q235B carbon steel, and the clamping bolts were made of 8.8 grade high-strength carbon steel to ensure that the strength of the components matched the high pressure and strong vibration conditions of the rolling mill. At the same time, the vibration level of the rolling mill was determined. For light vibration (rolling load ≤1000kN), the meshing angle was set to 0~5°; for medium vibration (rolling load 1000~2000kN), the meshing angle was set to 5~10°; and for heavy vibration (rolling load ≥2000kN), the meshing angle was set to 10~15°. Prepare the machining and assembly tools: CNC milling machine, wire cutting machine, torque wrench with an accuracy of ±2%, tooth profile inspection gauge, vibration simulation test bench, 400# metallographic sandpaper. For auxiliary materials, use medium-strength thread locking agent, thin anti-rust grease, and analytical grade anhydrous ethanol. Keep all tools and auxiliary materials clean, free of oil and impurities. The purchased pressure plates and bolt blanks are visually inspected to ensure that there are no cracks, deformations, or missing materials, that the bolt threads are free of stripping or irregular threads, and that the flatness of the pressure plate mounting surface is ≤0.03mm.

2. The anti-loosening process of the bolt pressure plate of the hydraulic pipeline clamp according to claim 1, characterized in that: Step two: Precision machining of the toothed structure of the bolts and pressure plate; The meshing teeth are machined on the mating surface of the pressure plate opposite the bolt using a CNC milling machine. At the same time, matching meshing teeth are machined on the end of the clamping bolt. The tooth profile is uniformly set with a module of 1.5~2.0mm, a tooth height of 2~3mm, and a tooth pitch of 3~4mm. The surface roughness of the tooth profile Ra≤1.6μm. After machining, there should be no burrs, missing teeth, or tooth tip chipping. The meshing surface fit of the tooth profile must be ≥95%. Based on the mill vibration level determined in step one, the meshing angle of the tooth engagement direction is processed by a wire EDM machine. Light vibration processes a 3° meshing angle, medium vibration processes an 8° meshing angle, and heavy vibration processes a 12° meshing angle, ensuring that the angle deviation is ≤ ±0.5° and there is no skew. The machined bolts and pressure plates are quenched to achieve a surface hardness of HRC40~45, which improves the wear resistance and impact resistance of the teeth and prevents wear caused by long-term vibration.

3. The anti-loosening process of the bolt pressure plate of the hydraulic pipeline clamp according to claim 1, characterized in that: Step 3: Pre-treatment of toothed components; Use 400# metallographic sandpaper to gently sand the toothed surface of the bolts and pressure plates along the toothed pattern to remove burrs, flash, and metal debris generated during processing. After sanding, the surface should feel smooth to the touch. Use a dust-free cleaning cloth soaked in analytical grade anhydrous ethanol to repeatedly wipe the bolt tooth surface, thread surface, pressure plate tooth surface, and mounting surface to remove surface oil and iron filings. After wiping, place the parts in a dry environment at room temperature to air dry naturally for no less than 3 minutes. Do not blow air or heat to accelerate drying. Apply a thin, even layer of anti-rust grease to the toothed meshing surfaces of the bolt and the pressure plate, with a coating amount ≤0.2g / cm². 2 To avoid excessive grease buildup affecting the meshing accuracy of the bolt teeth, apply a medium-strength thread-locking agent to the threaded portion of the bolt, covering an area of ​​1 / 2 of the effective thread length, to achieve auxiliary anti-loosening of the thread layer.

4. The anti-loosening process of the bolt pressure plate toothed engagement of the hydraulic pipeline clamp according to claim 1, characterized in that: Step four: Pre-engagement assembly of bolts and pressure plates; The lower plane of the pressure plate is initially fixed to the non-toothed end of the clamping bolt. A square is used to check the perpendicularity of the pressure plate and the bolt to ensure that the perpendicularity is ≤0.05mm, with no skewing or warping, to prevent uneven force during subsequent meshing. Engage the toothed surface on the upper part of the pressure plate with the toothed surface at the end of the bolt. During engagement, slowly rotate the bolt clockwise to ensure that the tooth tip and tooth root are fully engaged, without any tooth tip jamming or excessive tooth side clearance. If poor engagement occurs, the toothed surface needs to be sanded again to meet the requirements. After pre-engagement is completed, gently shake the bolt and pressure plate assembly to check that there is no separation or loosening at the toothed engagement point and that the overall assembly is firmly connected. Do not apply any additional tightening force after pre-engagement is completed, and wait for use.

5. The anti-loosening process of the bolt pressure plate of the hydraulic pipeline clamp according to claim 1, characterized in that: Step 5: Positioning and assembling the clamp and hydraulic pipeline; Based on the actual diameter of the hydraulic steel pipe, select a suitable clamping slot, place the hydraulic steel pipe stably in the center of the clamping slot, use a level to check the pipe's levelness, and ensure that the coaxiality between the pipe and the clamping slot is ≤0.1mm to avoid uneven clamping force caused by uneven pipe loading. Install the pre-engaged bolt-plate assembly on the holder's fixed seat, manually adjust the position of the plate so that the arc-shaped contact surface of the plate is completely in contact with the outer wall of the pipe, with no gaps or local suspensions between the plate and the pipe, ensuring that the clamping surface is evenly stressed. Adjust the installation position of the clamp to ensure that it does not interfere with other equipment in the rolling mill, while ensuring that the pipeline layout meets the design requirements of the rolling mill hydraulic system, and reserve sufficient working space for subsequent fastening operations.

6. The anti-loosening process of the bolt pressure plate of the hydraulic pipeline clamp according to claim 1, characterized in that: Step six: Precise pre-tightening and fixing of the toothed mesh; Use a torque wrench with an accuracy of ±2%, and match the corresponding preload torque according to the hydraulic pipeline diameter: DN10~20 is 25±2N・m, DN25~40 is 35±2N・m, DN45~60 is 45±2N・m, and DN65~80 is 55±2N・m. Slowly and evenly apply force to tighten the bolt along the direction of tooth engagement until the bolt and the teeth of the pressure plate are fully engaged and locked. Avoid applying force during the tightening process to prevent the teeth from cracking or the bolt from deforming. After tightening, use a toothed gauge to check the toothed meshing area to confirm that the teeth are not separated or misaligned. At the same time, shake the pipe by hand to check that the pipe is not displaced or loose, that the clamping force of the pressure plate on the pipe is uniform, and that there is no squeezing deformation on the outer wall of the pipe.

7. The anti-loosening process of the bolt pressure plate of the hydraulic pipeline clamp according to claim 1, characterized in that: Step 7: Working condition simulation anti-loosening performance test; The assembled pipe-clamp assembly was placed on a vibration simulation test bench to simulate the vibration parameters of an actual rolling mill: vibration frequency 20~50Hz, vibration acceleration 5~10m / s². 2 The vibration test was conducted continuously for 2 hours. During the vibration test, observe in real time whether the bolts rotate or jump, and whether there are signs of separation at the tooth meshing. If no such phenomena occur during the test, it is considered to be preliminarily qualified. After the test, use a torque wrench to check the pre-tightening torque of the bolts again. The torque attenuation rate should be ≤3%. At the same time, check the relative position of the pipe and the clamp. If there is no displacement or loosening, and the toothed meshing surface is not worn, the anti-loosening performance is up to standard. If the torque attenuation rate exceeds the standard or loosening occurs, it is necessary to retighten and check the toothed meshing state. If necessary, replace the toothed parts.

8. The anti-loosening process of the bolt pressure plate of the hydraulic pipeline clamp according to claim 1, characterized in that: Step eight: Finished product protection and on-site fixation; For clamping components that pass the anti-loosening performance test, apply a thin layer of anti-rust grease evenly to the bolt ends, the outer side of the pressure plate, and the exposed parts of the toothed meshing area. The grease thickness should be ≤0.05mm to prevent the anti-rust grease from entering the toothed meshing surface and affecting the anti-loosening effect. After the clamps have been assembled and debugged, fix them according to the on-site pipe layout position of the rolling mill hydraulic system. Use expansion bolts to firmly connect the clamp base to the installation foundation to ensure that the clamps and the foundation are not loose. After installation, re-check the bolt pre-tightening torque to ensure that the torque value meets the process requirements. A comprehensive inspection was conducted on the hydraulic pipelines after on-site installation to confirm that the pipelines were free from bends and compression, that the clamps did not interfere with surrounding equipment, and that the pipeline locations in concealed areas were clearly marked for easy inspection later.

9. The anti-loosening process of the bolt pressure plate toothed engagement of the hydraulic pipeline clamp according to claim 1, characterized in that: Step nine: Setting on-site inspection standards; The daily inspection cycle of the rolling mill is set to once a month. During the inspection, only the pre-tightening torque of the clamp bolts needs to be checked with a torque wrench. There is no need to disassemble the toothed meshing structure of the bolt pressure plate, thus avoiding repeated disassembly and tooth wear. During the inspection, if a slight decrease in the bolt preload torque is found, tighten it to the standard torque corresponding to the pipe diameter; if the inspection finds obvious wear at the tooth meshing, stripped bolt threads, or deformation of the pressure plate, the bolt-pressure plate assembly should be replaced in time to ensure the continuous and stable anti-loosening effect. Establish an inspection record log to record the torque value and clamp status for each inspection. For clamps operating under heavy vibration conditions in rolling mills, appropriately shorten the inspection cycle to once every 20 days.