Analysis of common faults of used welded pipe equipments sizing machine (3)
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- Release time:2022-12-24 11:30
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【概要描述】In contrast, the failure rate of the sizing machine is the lowest, and it is easier to deal with. The common production accidents of the used welded pipe equipments sizing machine are as follows: ① Scratches. ②Drilling pipe. ③The pipe is not round.
Analysis of common faults of used welded pipe equipments sizing machine (3)
【概要描述】In contrast, the failure rate of the sizing machine is the lowest, and it is easier to deal with. The common production accidents of the used welded pipe equipments sizing machine are as follows: ① Scratches. ②Drilling pipe. ③The pipe is not round.
- Sort:Information
- Auth:
- Source:
- Release time:2022-12-24 11:30
- Pvs:
In contrast, the failure rate of the sizing machine is the lowest, and it is easier to deal with. The common production accidents of the used welded pipe equipments sizing machine are as follows: ① Scratches. ②Drilling pipe. ③The pipe is not round.
In order to let everyone understand the common faults of used welded pipe equipments sizing machines, we analyze the common faults of used welded pipe equipments sizing machines on this issue - the pipe is not round.
The tube is not round
The shapes of non-circular tubes are generally oval, ribbed and gourd-shaped.
①Oval
The oval tube is completely caused by improper adjustment of the sizing hole, especially after the sizing hole has a certain wear, unreasonable adjustment will make the pipe more likely to appear elliptical. In general, elliptical tubes that occur on the transverse and longitudinal axes of the tube section (Fig. 29),
It is caused by the unreasonable matching of the pressure between the flat roll and the vertical roll. The pressure can be appropriately increased in the long axis direction of the elliptical tube and reduced in the short axis direction.
If the axis of the elliptical tube has an inclined angle (Fig. 30),
It should be adjusted according to the actual situation. For example, when the elliptical tube caused by the flat roll and the vertical roll is in the same direction, the steering adjustment method can be used. By pressing down one side of the flat roll, the tube is rotated in a certain direction, and then the pressure of the vertical roll and the pressure of the vertical roll can be increased or decreased. adjust. This kind of elliptical tube is a typical example that is difficult to adjust. If the steering method cannot solve the problem, the method of hole type transposition can also be carried out. That is to say, remove the two vertical rollers and change the position, so that the elliptical tube from the flat roller hole forms an opposite direction, and then adjust the increase and decrease force. Or it is also possible to change the direction of the pass pattern of the upper flat roll, so that the worn pass pattern of the flat roll can be recombined. The direction of the long axis of the pass of the lower roll opposite to the axial direction. Of course, this is a treatment that is only used when other methods fail to solve the elliptical tube.
②Ribbed round tube
The ribbed round tube refers to a certain part of the round surface of the tube with a protruding rib shape (Figure 31),
We call it a prismatic tube. Generally, there are the following reasons for the production of this kind of tube.
(1)Poor forming deformation
This situation should not occur in the early stage of the use of the hole pattern. After the middle and later stages, the hole pattern is sometimes used unreasonably, and the hole pattern arc surface has irregular deformity and wear. This undesirable deformation produces prismatic tubes. When the machine is stopped for inspection, we can touch the outer arc surface of the deformed tube blank one by one with the palm of our hand, and we can feel whether the tube blank is abnormally deformed.
(2)Sizing hole wear
The wear of the sizing hole is one of the most important reasons for the round pipe caused by the wear of the sizing hole, especially when some slight peach-shaped pipes are often produced, but cannot be solved in time, the A certain part of the sizing hole type will be specially worn, so that a concave arc surface will be formed in this part, resulting in the appearance of a ribbed round tube. This requires us to deal with and solve some bad forming deformation problems and the production of peach-shaped pipes as soon as possible, and often check the wear of the sizing hole, and replace it in time when it is found that the arc of the hole has irregular wear.
(3) Uneven force on the straightening roller. There are basically two types of straightening roller structure, one is a four-roller structure (Figure 32), and the other is an eight-roller structure (Figure 33).
The cause of the angular round tube is generally caused by the straightening roller of the eight-roll structure. When the pipe is straightened, the overall adjustment should be carried out according to the adjustment process requirements, so that the contact force between each roller and the pipe surface is very light. If the single-roller adjustment is performed, the circular shape formed by every four rolls will be destroyed, and under the pressure of the single-roller, a strange angular surface will appear on the surface of the tube.
③Gourd pipe
Sometimes when we check the outer diameter of the pipe, we will find that the diameter of the pipe is thick and thin, and the thickness error can be up to about 0.3 mm, commonly known as the gourd pipe. This is mainly caused by the following two situations.
(1)Bearing damage
When the flat roll bearing is slightly damaged, with the rotation of the roll, the residual dead point of the jam may sometimes occur. When the pressure of the roll changes and cannot be constant, the outer diameter of the tube is controlled. The same changes will occur, and the tube will have a cycle-unstable gourd-like size. But as long as the bearing rotates stably, even when the bearing is damaged, it will not bring too much adverse effect on the outer diameter of the tube.
(2)Flat roll shaft bending
Bending of the flat roller shaft Due to special reasons such as the drill pipe, after the flat roller shaft is damaged by a large external force, the bending amount of the shaft exceeds the limit of its elastic deformation and cannot be restored, at the position of the hole pattern, between the two shafts The distance has changed (Figure 34).
With the rotation of the rolls, the distance between the axes also changes, so that the diameter of the pipe also appears larger and smaller. And this kind of gourd pipe is periodically stable and equidistant. When solving this problem, we first check the radial runout of the roll, from which we can judge whether both the upper and lower shafts are bent, or only one shaft is bent. If both shafts are bent, one of the shafts can be rotated 180° before installation and use (Figure 35)
In this way, the same inter-axis distance between the two axes can always be maintained when the two axes are rotated. If a shaft is bent, it is necessary to replace a new shaft, or reduce the pressure of the flat roller on the tube.
If the used welded pipe equipments has common faults in the sizing machine, and the pipe is not round, pay attention to these three pipe shapes ①Ellipse. ②The edge is round. ③Gourd shape. Hope to be of some help to you. Our company has many brands and wide resources, there is always one suitable for you. You only need to inform us of your pipe manufacturing needs, and our company will provide you with used welded pipe equipments that really suits your needs. Welcome new and old customers to come to consult and order.
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Time of issue : 2025-07-11
Assessing the condition of a used slitting line requires a systematic approach to determine its operational capability and remaining service life. Unlike new equipment, pre-owned machines exhibit varying degrees of wear that directly impact performance and value. Below are essential factors to consider when evaluating a used slitting line.
Structural Integrity and Frame Condition
The machine's frame serves as the foundation for precision operations. Inspect for signs of structural fatigue, including cracks, welds, or deformations in the main frame. Check for corrosion, particularly in environments where the used slitting line may have been exposed to moisture or chemicals. A laser alignment test can reveal whether critical components remain properly positioned after years of operation.
Mechanical Wear of Core Components
Examine high-wear components such as shafts, bearings, and gears for excessive play or scoring. The decoiler and recoiler mandrels should be evaluated for straightness and grip strength. On the slitting unit, inspect spindle runout and blade holder conditions. These elements directly affect the machine's ability to maintain tolerances during operation.
Electrical System and Control Reliability
Assess the condition of motors, drives, and control systems. Older used slitting lines may have obsolete electrical components that require upgrading. Test the responsiveness of the PLC or CNC interface and check for consistency in tension control systems. Modernization potential should be considered when evaluating long-term viability.
Hydraulic and Pneumatic Performance
Hydraulic systems in a used slitting line often show signs of leakage or pressure loss. Inspect cylinders, valves, and pumps for proper operation. Pneumatic components should be checked for air leaks and actuator responsiveness. Fluid analysis can reveal contamination levels in hydraulic systems.
Blade Condition and Cutting Accuracy
The slitting knives and associated tooling represent critical wear components. Measure blade sharpness and check for chips or uneven wear patterns. Evaluate the blade adjustment mechanisms for smooth operation and precision. Test cuts on sample material reveal the machine's current cutting capability.
Material Handling System Functionality
Assess the condition of levelers, straighteners, and feed systems. Look for worn rollers, misaligned guides, and tension measurement accuracy. The material handling system significantly impacts the final product quality and operational efficiency of the used slitting line.
Documentation and Service History Review
Request maintenance records and operational logs to understand the machine's service background. Regular servicing and proper lubrication history indicate better-preserved conditions. Verify hours of operation and review any major repairs or component replacements.
Performance Testing Under Load
Conduct trial runs with actual production materials to evaluate the used slitting line under working conditions. Monitor vibration levels, noise patterns, and temperature variations during operation. Measure slit material for dimensional accuracy and edge quality to assess current capabilities.
Obsolescence and Upgrade Potential
Evaluate whether the machine's technology remains relevant for current production needs. Consider the availability of replacement parts and potential upgrade paths for control systems or critical components. Some older used slitting lines offer excellent mechanical foundations for modernization.
Economic Value Assessment
Compare the machine's condition against current market prices for similar equipment. Factor in potential refurbishment costs and expected service life to determine true value. A thorough evaluation helps avoid unexpected expenses after purchase.
By systematically examining these aspects, buyers can make informed decisions about a used slitting line's suitability for their production requirements. Professional inspection services can provide additional assurance when evaluating higher-value equipment.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
Assessing the condition of a used slitting line requires a systematic approach to determine its operational capability and remaining service life. Unlike new equipment, pre-owned machines exhibit varying degrees of wear that directly impact performance and value. Below are essential factors to consider when evaluating a used slitting line.
Structural Integrity and Frame Condition
The machine's frame serves as the foundation for precision operations. Inspect for signs of structural fatigue, including cracks, welds, or deformations in the main frame. Check for corrosion, particularly in environments where the used slitting line may have been exposed to moisture or chemicals. A laser alignment test can reveal whether critical components remain properly positioned after years of operation.
Mechanical Wear of Core Components
Examine high-wear components such as shafts, bearings, and gears for excessive play or scoring. The decoiler and recoiler mandrels should be evaluated for straightness and grip strength. On the slitting unit, inspect spindle runout and blade holder conditions. These elements directly affect the machine's ability to maintain tolerances during operation.
Electrical System and Control Reliability
Assess the condition of motors, drives, and control systems. Older used slitting lines may have obsolete electrical components that require upgrading. Test the responsiveness of the PLC or CNC interface and check for consistency in tension control systems. Modernization potential should be considered when evaluating long-term viability.
Hydraulic and Pneumatic Performance
Hydraulic systems in a used slitting line often show signs of leakage or pressure loss. Inspect cylinders, valves, and pumps for proper operation. Pneumatic components should be checked for air leaks and actuator responsiveness. Fluid analysis can reveal contamination levels in hydraulic systems.
Blade Condition and Cutting Accuracy
The slitting knives and associated tooling represent critical wear components. Measure blade sharpness and check for chips or uneven wear patterns. Evaluate the blade adjustment mechanisms for smooth operation and precision. Test cuts on sample material reveal the machine's current cutting capability.
Material Handling System Functionality
Assess the condition of levelers, straighteners, and feed systems. Look for worn rollers, misaligned guides, and tension measurement accuracy. The material handling system significantly impacts the final product quality and operational efficiency of the used slitting line.
Documentation and Service History Review
Request maintenance records and operational logs to understand the machine's service background. Regular servicing and proper lubrication history indicate better-preserved conditions. Verify hours of operation and review any major repairs or component replacements.
Performance Testing Under Load
Conduct trial runs with actual production materials to evaluate the used slitting line under working conditions. Monitor vibration levels, noise patterns, and temperature variations during operation. Measure slit material for dimensional accuracy and edge quality to assess current capabilities.
Obsolescence and Upgrade Potential
Evaluate whether the machine's technology remains relevant for current production needs. Consider the availability of replacement parts and potential upgrade paths for control systems or critical components. Some older used slitting lines offer excellent mechanical foundations for modernization.
Economic Value Assessment
Compare the machine's condition against current market prices for similar equipment. Factor in potential refurbishment costs and expected service life to determine true value. A thorough evaluation helps avoid unexpected expenses after purchase.
By systematically examining these aspects, buyers can make informed decisions about a used slitting line's suitability for their production requirements. Professional inspection services can provide additional assurance when evaluating higher-value equipment.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-07-10
The proper selection and preparation of a production site are critical factors in ensuring optimal performance and safety when operating a used slitting line. Unlike new equipment, second-hand machinery may have specific spatial and environmental needs due to previous usage patterns or wear conditions. Below are key considerations for selecting an appropriate workspace for a used slitting line.
Space Allocation and Layout Planning
Adequate floor space must be allocated to accommodate the entire slitting line, including material storage areas. The layout should allow for smooth coil loading and unloading operations, with sufficient clearance for overhead cranes or forklifts. Since a used slitting line may require more frequent maintenance access, additional space around critical components like the slitter head and tension stations should be incorporated.
Floor Load Capacity and Foundation Requirements
The chosen location must have a reinforced concrete floor capable of supporting the substantial weight of both the machinery and coiled materials. Older slitting lines often have heavier frames compared to modern equivalents, making floor strength assessment crucial. Vibration dampening considerations should be addressed, especially if the equipment shows signs of increased vibration due to wear.
Material Flow Optimization
The workspace should facilitate logical material movement from raw coil storage through processing to finished product staging. For a used slitting line, particular attention should be paid to entry and exit points to prevent material handling bottlenecks. The layout must account for any peculiarities in the machine's feeding or discharge mechanisms that may have developed during its previous service life.
Environmental Conditions Control
Maintaining stable environmental conditions helps preserve the accuracy of a used slitting line. The area should be protected from extreme temperature fluctuations and humidity variations that could affect material properties or machine tolerances. Proper ventilation is essential, especially when processing materials that generate dust or fumes.
Power Supply and Utility Requirements
A used slitting line may have specific electrical needs based on its original configuration and any subsequent modifications. The workspace must provide appropriate power capacity, including voltage stability and phase requirements. Compressed air lines, hydraulic power units, and coolant systems should be positioned for optimal machine performance.
Safety Zones and Emergency Access
Clear safety perimeters must be established around the slitting line, accounting for the machine's age and potential reliability issues. Emergency stop buttons and fire suppression equipment should be easily accessible. The layout should enable quick evacuation routes and provide space for safety barriers where needed.
Lighting and Visibility Considerations
Adequate lighting is particularly important for older equipment where visual inspection of material quality and machine operation is crucial. Task lighting should be positioned to illuminate critical areas such as the slitting zone and tension monitoring points without creating glare or shadows.
Future Expansion and Flexibility
When siting a used slitting line, consideration should be given to potential future upgrades or reconfigurations. The workspace should allow for possible additions of auxiliary equipment or modifications to the material handling system.
Noise Control Measures
Older slitting lines may generate higher noise levels, requiring appropriate acoustic treatment of the workspace. This could include sound-absorbing wall panels or strategic placement of noise barriers between the equipment and operator stations.
By carefully evaluating these factors when selecting a production site, operators can maximize the efficiency and service life of a used slitting line while maintaining a safe working environment. The workspace should be periodically reassessed as the machine's performance characteristics evolve over time.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
The proper selection and preparation of a production site are critical factors in ensuring optimal performance and safety when operating a used slitting line. Unlike new equipment, second-hand machinery may have specific spatial and environmental needs due to previous usage patterns or wear conditions. Below are key considerations for selecting an appropriate workspace for a used slitting line.
Space Allocation and Layout Planning
Adequate floor space must be allocated to accommodate the entire slitting line, including material storage areas. The layout should allow for smooth coil loading and unloading operations, with sufficient clearance for overhead cranes or forklifts. Since a used slitting line may require more frequent maintenance access, additional space around critical components like the slitter head and tension stations should be incorporated.
Floor Load Capacity and Foundation Requirements
The chosen location must have a reinforced concrete floor capable of supporting the substantial weight of both the machinery and coiled materials. Older slitting lines often have heavier frames compared to modern equivalents, making floor strength assessment crucial. Vibration dampening considerations should be addressed, especially if the equipment shows signs of increased vibration due to wear.
Material Flow Optimization
The workspace should facilitate logical material movement from raw coil storage through processing to finished product staging. For a used slitting line, particular attention should be paid to entry and exit points to prevent material handling bottlenecks. The layout must account for any peculiarities in the machine's feeding or discharge mechanisms that may have developed during its previous service life.
Environmental Conditions Control
Maintaining stable environmental conditions helps preserve the accuracy of a used slitting line. The area should be protected from extreme temperature fluctuations and humidity variations that could affect material properties or machine tolerances. Proper ventilation is essential, especially when processing materials that generate dust or fumes.
Power Supply and Utility Requirements
A used slitting line may have specific electrical needs based on its original configuration and any subsequent modifications. The workspace must provide appropriate power capacity, including voltage stability and phase requirements. Compressed air lines, hydraulic power units, and coolant systems should be positioned for optimal machine performance.
Safety Zones and Emergency Access
Clear safety perimeters must be established around the slitting line, accounting for the machine's age and potential reliability issues. Emergency stop buttons and fire suppression equipment should be easily accessible. The layout should enable quick evacuation routes and provide space for safety barriers where needed.
Lighting and Visibility Considerations
Adequate lighting is particularly important for older equipment where visual inspection of material quality and machine operation is crucial. Task lighting should be positioned to illuminate critical areas such as the slitting zone and tension monitoring points without creating glare or shadows.
Future Expansion and Flexibility
When siting a used slitting line, consideration should be given to potential future upgrades or reconfigurations. The workspace should allow for possible additions of auxiliary equipment or modifications to the material handling system.
Noise Control Measures
Older slitting lines may generate higher noise levels, requiring appropriate acoustic treatment of the workspace. This could include sound-absorbing wall panels or strategic placement of noise barriers between the equipment and operator stations.
By carefully evaluating these factors when selecting a production site, operators can maximize the efficiency and service life of a used slitting line while maintaining a safe working environment. The workspace should be periodically reassessed as the machine's performance characteristics evolve over time.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill

Time of issue : 2025-07-09
Proper training is essential for ensuring safe and efficient operation of a used slitting line. Since second-hand equipment may have unique wear patterns or modifications, operators must be thoroughly trained to handle its specific requirements. Below are key aspects of personnel training for a used slitting line:
Understanding Machine Components and Functions
Operators must familiarize themselves with all parts of the slitting line, including the decoiler, slitter, tension control system, and recoiler. Training should cover the purpose of each component, common wear points, and how to identify signs of malfunction. Since a used slitting line may have undergone previous repairs or adjustments, operators should learn its specific configuration.
Safety Procedures and Emergency Protocols
Safety training is critical when working with a used slitting line. Operators must understand lockout/tagout (LOTO) procedures to prevent accidental startups during maintenance. They should also be trained on emergency stop functions, proper PPE usage, and how to handle material jams safely. Since older machines may lack modern safety features, extra caution is necessary.
Material Handling and Setup
Proper material loading and alignment are crucial for smooth operation. Training should include how to safely mount and center coils on the decoiler, adjust tension controls, and thread material through the slitting line. Operators should learn how to select and install the correct blades for different materials, as improper setup can lead to poor cuts or machine damage.
Blade Maintenance and Adjustment
Since blade wear is a common issue in used slitting lines, operators must be trained in blade inspection, sharpening, and replacement. They should understand how to adjust blade gaps for different material thicknesses and recognize when blades need servicing. Proper handling techniques should be emphasized to prevent injuries.
Troubleshooting Common Issues
Operators should be trained to identify and resolve frequent problems in a used slitting line, such as misaligned material, uneven tension, or blade chatter. Training should include basic diagnostic steps and when to escalate issues to maintenance personnel. Documenting recurring problems can help improve long-term reliability.
Preventive Maintenance Practices
Regular maintenance is key to extending the lifespan of a used slitting line. Operators should learn daily inspection routines, lubrication points, and how to clean critical components. Training should emphasize the importance of reporting unusual noises, vibrations, or performance changes before they lead to major failures.
Quality Control and Inspection
Operators must understand how to check slit material for defects such as burrs, edge waves, or dimensional inaccuracies. Training should include using measuring tools and maintaining consistent quality standards. Since a used slitting line may have slight deviations, operators should know how to compensate for them.
Handover and Shift Communication
In multi-shift operations, clear communication is vital. Operators should be trained in proper handover procedures, including reporting machine status, ongoing issues, and maintenance needs. This ensures smooth transitions and reduces downtime.
By implementing comprehensive training programs, companies can maximize the efficiency and safety of a used slitting line, reducing operational risks and improving productivity. Regular refresher courses should be conducted to keep skills updated.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
Proper training is essential for ensuring safe and efficient operation of a used slitting line. Since second-hand equipment may have unique wear patterns or modifications, operators must be thoroughly trained to handle its specific requirements. Below are key aspects of personnel training for a used slitting line:
Understanding Machine Components and Functions
Operators must familiarize themselves with all parts of the slitting line, including the decoiler, slitter, tension control system, and recoiler. Training should cover the purpose of each component, common wear points, and how to identify signs of malfunction. Since a used slitting line may have undergone previous repairs or adjustments, operators should learn its specific configuration.
Safety Procedures and Emergency Protocols
Safety training is critical when working with a used slitting line. Operators must understand lockout/tagout (LOTO) procedures to prevent accidental startups during maintenance. They should also be trained on emergency stop functions, proper PPE usage, and how to handle material jams safely. Since older machines may lack modern safety features, extra caution is necessary.
Material Handling and Setup
Proper material loading and alignment are crucial for smooth operation. Training should include how to safely mount and center coils on the decoiler, adjust tension controls, and thread material through the slitting line. Operators should learn how to select and install the correct blades for different materials, as improper setup can lead to poor cuts or machine damage.
Blade Maintenance and Adjustment
Since blade wear is a common issue in used slitting lines, operators must be trained in blade inspection, sharpening, and replacement. They should understand how to adjust blade gaps for different material thicknesses and recognize when blades need servicing. Proper handling techniques should be emphasized to prevent injuries.
Troubleshooting Common Issues
Operators should be trained to identify and resolve frequent problems in a used slitting line, such as misaligned material, uneven tension, or blade chatter. Training should include basic diagnostic steps and when to escalate issues to maintenance personnel. Documenting recurring problems can help improve long-term reliability.
Preventive Maintenance Practices
Regular maintenance is key to extending the lifespan of a used slitting line. Operators should learn daily inspection routines, lubrication points, and how to clean critical components. Training should emphasize the importance of reporting unusual noises, vibrations, or performance changes before they lead to major failures.
Quality Control and Inspection
Operators must understand how to check slit material for defects such as burrs, edge waves, or dimensional inaccuracies. Training should include using measuring tools and maintaining consistent quality standards. Since a used slitting line may have slight deviations, operators should know how to compensate for them.
Handover and Shift Communication
In multi-shift operations, clear communication is vital. Operators should be trained in proper handover procedures, including reporting machine status, ongoing issues, and maintenance needs. This ensures smooth transitions and reduces downtime.
By implementing comprehensive training programs, companies can maximize the efficiency and safety of a used slitting line, reducing operational risks and improving productivity. Regular refresher courses should be conducted to keep skills updated.
For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier:www.usedpipemill.com
JinYuJie-Used Pipe Mills Supplier(Please click the link→) :second-hand pipe mill
Wechat: 13392281699
Email: zty@usedpipemill.com
Company address:No. A99, East Lecong Avenue, Lecong Town, Foshan City, Guangdong Province
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