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In modern industrial production, hydraulic systems are widely used in engineering machinery, metallurgical equipment, agricultural machinery, mining machinery and other fields. As the core actuator in the hydraulic system, the performance of the hydraulic cylinder is directly related to the operating efficiency and safety of the entire system. In particular, the welded hydraulic cylinder performs particularly well under heavy load conditions due to its compact structure, strong pressure bearing capacity and good sealing. However, even the most high-performance hydraulic cylinders cannot do without daily maintenance and care. This article will start from the structural characteristics of the welded hydraulic cylinder and introduce in detail the key points of its maintenance and care to help users extend the life of the equipment and ensure the safety of the operation.

1. Introduction to welded hydraulic cylinders

Welded hydraulic cylinders are a type of hydraulic cylinder that is made by welding the cylinder body to the cylinder bottom, cylinder head and other parts. Compared with the tie rod hydraulic cylinder, the welded structure is more compact and has strong pressure resistance, which is suitable for high-intensity and continuous working environments.

Welded hydraulic cylinders are widely used in construction machinery, garbage disposal equipment, agricultural machinery, material handling equipment and other scenarios. Their maintenance requirements are relatively high, but proper maintenance can significantly improve service life and stability.

2. Importance of maintenance of welding hydraulic cylinders

Maintaining welding hydraulic cylinders is not only a guarantee for keeping the equipment running well, but also a key link to reduce equipment failure rate and maintenance costs. Hydraulic cylinders that lack daily maintenance are prone to the following problems:

Rust or strain on the piston rod

Aging or damage of the oil seal leads to oil leakage

Hydraulic oil pollution, reduced system efficiency

Stress concentration or cracks at the weld

Wear and deformation inside the cylinder

Therefore, establishing a systematic maintenance mechanism is crucial to ensure operational safety and extend the service life of the hydraulic cylinder.

3. Daily inspection content of welding hydraulic cylinders

3.1 Check the quality of hydraulic oil

Hydraulic oil is the "blood" of hydraulic cylinder operation, and its cleanliness and viscosity directly affect the lubricity and pressure transmission efficiency of the system. Daily inspections should include:

Color and transparency: Clean hydraulic oil should be light-colored and transparent. If emulsification, blackening or odor is found, it should be replaced immediately.

Water content: Use test paper or sampling to detect whether there is water mixed in.

Replacement cycle: According to the intensity of work and the use environment, the hydraulic oil is generally replaced every 6-12 months.

3.2 Check whether the hydraulic cylinder has oil leakage

Observe whether there are oil stains or oil dripping on the cylinder head, piston rod, and interface of the welded hydraulic cylinder. If oil leakage is found, the seal should be replaced in time or the welding part should be checked for fine cracks.

3.3 Check the surface condition of the piston rod

The piston rod is the most frequently moving part of the hydraulic cylinder, and its surface must be kept smooth and scratch-free:

Clean the piston rod regularly to prevent the adhesion of mud and sand particles and scratches.

If scratches, pits or corrosion are found, they should be handled or replaced in time.

Prevent the piston rod from being exposed to rain or highly corrosive gas environment for a long time.

3.4 Check the strength and integrity of the weld

The most notable feature of the welded hydraulic cylinder is the welded structure, so it is necessary to focus on whether stress cracks or fatigue damage occur in the weld part:

Regularly use non-destructive testing methods (such as ultrasonic and magnetic particle testing) to check the key weld area.

If cracks are found, stop using it in time and repair or replace it.

4. Regular maintenance measures for welded hydraulic cylinders

4.1 Regular replacement of seals

Seals are important components to prevent hydraulic oil leakage and are consumables. It is recommended that:

Check the state of the seal ring every year or after every 2000 hours of operation.

Replace in time when oil leakage occurs or the seal ring hardens or deforms.

Make sure the installation direction and model are correct when replacing to avoid secondary damage caused by improper installation.

4.2 Lubrication and rust prevention

Although hydraulic oil has a certain lubrication effect, the outside of the cylinder and the piston rod still need to be lubricated and rust-proofed regularly:

Use special rust-proof lubricating oil or silicone grease to apply to the exposed part of the piston rod.

Equipment that has been shut down for a long time needs to manually extend and retract the hydraulic cylinder regularly to prevent the piston rod from "rusting".

4.3 Check the hydraulic cylinder fixing device

The mounting bracket, ear shaft, pin shaft and other parts of the welded hydraulic cylinder need to be checked regularly:

Ensure that there is no looseness or wear.

All connecting pins must be tightened to avoid impact loads caused by gaps due to looseness.

5. Maintenance points under special working conditions

When the welding hydraulic cylinder is used under certain special working conditions (high temperature, high dust, corrosive environment), it is necessary to strengthen the maintenance measures:

5.1 High temperature working conditions

Choose high temperature oil-resistant sealing materials (such as fluororubber).

Check the oil temperature regularly to prevent the hydraulic oil from deteriorating.

5.2 High dust environment

Install a dust cover to protect the piston rod from being scratched by abrasive particles.

Increase the cleaning frequency.

5.3 Corrosive environment (such as chemical plants, ports)

It is recommended to use chrome-plated or stainless steel materials for the piston rod.

The surface of the hydraulic cylinder shell should be treated with anti-corrosion, such as spraying paint or zinc.

6. Precautions for use and operation

Maintenance is not only carried out when the equipment is stationary, but also the standardized use during operation is also crucial:

The rated pressure and stroke of the hydraulic cylinder must not be exceeded.

It is forbidden to run the hydraulic cylinder at high speed without load to prevent oil shock.

Try to avoid the hydraulic cylinder being in the extreme position (fully extended or fully retracted) for a long time to prevent internal impact.

As a heavy-duty actuator, the stability of the welding hydraulic cylinder directly affects the operating efficiency of the entire equipment. Good maintenance and care are the core guarantee for its efficient operation. Through standardized daily inspections, regular maintenance, professional treatment and scientific management, the service life of the welding hydraulic cylinder can be greatly improved, while also reducing the failure rate and maintenance costs.

For enterprises, establishing a systematic hydraulic cylinder maintenance mechanism can not only avoid the economic losses caused by sudden equipment downtime, but also fundamentally improve operating efficiency and operational safety. In today's world of continuous development of production automation and mechanization, the maintenance of hydraulic equipment also deserves our more attention and professional strength.

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

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