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As a key component in the mechanical transmission system, the reliability and stability of the hydraulic cylinder are crucial to the normal operation of the entire system. However, in actual use, the hydraulic cylinder sometimes has the problem of being unable to extend and retract, which not only affects production efficiency but may also cause equipment damage or even safety accidents. This article will discuss in detail the common reasons why the hydraulic cylinder cannot be extended and retracted, and provide corresponding diagnosis and solution suggestions.

1. Analysis of the reasons why the hydraulic cylinder cannot be extended and retracted

Hydraulic oil problem

Pollution: Contaminants in the hydraulic oil (such as dust, metal particles, etc.) can cause the valve to be stuck or blocked, affecting the normal extension and retraction of the hydraulic cylinder.

Oil deterioration: After long-term use, the hydraulic oil may oxidize and deteriorate, increase viscosity, and cause poor fluidity, affecting the working performance of the hydraulic cylinder.

Insufficient oil level: The hydraulic cylinder needs enough hydraulic oil to generate pressure. If the oil level is too low, it will not provide enough power to move the piston.

Damaged seals

Aging seals: Over time, the seals may age, harden, or crack, causing hydraulic oil leakage and reducing system pressure.

Wear of seals: Frequent reciprocating motion can cause wear of seals, which in turn causes leakage and affects the normal operation of the hydraulic cylinder.

Mechanical failure

Bending of piston rod: The piston rod may bend when it is impacted by external force or subjected to lateral load for a long time, resulting in failure to retract normally.

Deformation of cylinder barrel: The deformation of the cylinder barrel under high pressure or due to external impact will also affect the movement of the hydraulic cylinder.

Wear guide sleeve: The guide sleeve is used to guide the movement of the piston rod. If it is severely worn, it will increase friction resistance and affect retraction.

Cavitation phenomenon

Air ingress: If the air in the hydraulic system is not completely exhausted, it will form cavitation under high pressure, leading to cavitation and affecting the stability of the hydraulic cylinder.

Poor exhaust: If the hydraulic cylinder is not designed properly or maintained properly, it will lead to insufficient exhaust and cavitation.

Improper operation

Overload use: If the hydraulic cylinder is used beyond its designed load capacity, it will cause damage to internal parts and failure to retract.

Excessive speed: Starting or stopping too quickly will generate a large inertial force, causing an impact on the hydraulic cylinder and affecting its life.

Problem with electrical control system

Solenoid valve failure: If the solenoid valve that controls the extension and retraction of the hydraulic cylinder fails, such as coil burnout, valve core stuck, etc., it will directly affect the action of the hydraulic cylinder.

Controller setting error: Incorrect parameter setting may cause the hydraulic cylinder to not work as expected.

2. Diagnosis and solution suggestions

Check the hydraulic oil

Replace the hydraulic oil regularly: Replace the hydraulic oil according to the manufacturer's recommended cycle and ensure that the oil that meets the specifications is used.

Clean the oil tank: Clean the impurities in the oil tank regularly to prevent contaminants from entering the system.

Check the oil level: Ensure that the hydraulic oil is at the appropriate level to avoid insufficient pressure due to low oil levels.

Replace seals

Check the seals regularly: Check the condition of all seals regularly and replace them in time if they are aging or worn.

Select the appropriate sealing material: Select the appropriate sealing material according to the working environment to improve the sealing effect.

Repair mechanical failures

Correct the piston rod: If the piston rod is bent, it can be corrected or replaced with a new piston rod by professional equipment.

Repair or replace the cylinder: For slightly deformed cylinders, you can try to repair them, and for severe deformation, you need to replace a new cylinder.

Replace the guide sleeve: Check the wear of the guide sleeve regularly and replace it if necessary.

Eliminate cavitation

Sufficient exhaust: Ensure sufficient exhaust during installation and maintenance to avoid air remaining in the system.

Optimize the design: Optimize the design of parts prone to cavitation to reduce the probability of cavitation.

Standardize operation

Avoid overload: Use strictly according to the rated load capacity of the hydraulic cylinder to avoid overload operation.

Smooth operation: Start and stop slowly to reduce the impact on the hydraulic cylinder.

Check the electrical control system

Repair the solenoid valve: Check the working status of the solenoid valve regularly, and repair or replace it in time if any problem is found.

Correctly set the controller parameters: Ensure that the parameters of the controller are set correctly to ensure that the hydraulic cylinder can work as expected.

The inability of the hydraulic cylinder to extend and retract is a complex problem that may be caused by many factors. From the above analysis, it can be seen that the quality of the hydraulic oil, the state of the seals, the integrity of the mechanical parts, the presence or absence of cavitation, the correctness of the operation method, and the reliability of the electrical control system are all important factors affecting the normal operation of the hydraulic cylinder. Therefore, in the process of daily maintenance and use, attention should be paid to the inspection and maintenance of these aspects, and problems should be discovered and solved in time to ensure that the hydraulic cylinder can work stably and reliably. At the same time, strengthening the training of operators and improving their understanding and operating skills of the hydraulic system is also one of the important measures to prevent hydraulic cylinder failures.

As a hydraulic cylinder exporter from China, we are well aware of the importance of hydraulic cylinders in mechanical transmission systems. Therefore, we are committed to providing high-quality, high-performance hydraulic cylinder products to meet the needs of global customers. Our hydraulic cylinders use advanced manufacturing processes and high-quality materials and undergo strict quality control and testing to ensure their reliability and stability. At the same time, we also provide comprehensive after-sales service and technical support to help customers solve problems encountered during use. Whether you need a standard model of hydraulic cylinder or a customized solution, we can meet your needs.

http://www.toringcylinder.com
Ningbo Toring Machinery Manufacturing Co., Ltd.

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