China Professional Manufacture Hydraulic Boom Cylinder for Large Excavator for Sale

Hydraulic Boom Cylinder

A hydraulic boom cylinder for a large excavator is a double-acting cylinder used to lift and lower the boom of an excavator. It is one of the most enormous cylinders on an excavator and is responsible for raising the heaviest loads. The hydraulic boom cylinder is a vital component of large excavators and is responsible for controlling the movement of the boom arm. The boom arm is an extendable and retractable arm that allows the excavator to reach different heights, angles, and distances. 
Specification of Boom Cylinder
Bore diameter: 200mm~420mm
Rod diameter: 140mm~300mm
Stroke≤3500mm
Maximum 4846.6KN
Pressure: 35MPa

Here's how the hydraulic boom cylinder typically works:

1. Hydraulic System: The hydraulic boom cylinder operates within the hydraulic system of the excavator, which consists of a hydraulic pump, control valves, hydraulic hoses or piping, and a hydraulic fluid reservoir. The pump supplies pressurized hydraulic fluid, usually oil, to the system.

2. Cylinder Construction: The hydraulic boom cylinder comprises a cylinder barrel, a piston, and a piston rod. The cylinder barrel is a cylindrical tube with sealed ends. The piston is a cylindrical component that fits snugly inside the cylinder barrel, dividing it into two chambers: the rod side (head end) and the cap side (blind end). The piston rod extends from the piston and is connected to the boom arm.

3. Fluid Pressure Application: When pressurized hydraulic fluid is directed to the cylinder's rod side (head end), it pushes against the piston, creating a force that extends the piston rod. The hydraulic pressure is evenly distributed across the piston, generating a balanced force.

4. Boom Arm Movement: As the hydraulic fluid applies pressure to one side of the piston, it extends the piston rod, causing the boom arm to extend. This extension enables the excavator to reach farther and higher, allowing for increased digging depth and improved material handling capabilities. The hydraulic cylinder provides the necessary force to control the movement and positioning of the boom arm.

5. Retraction: To retract the boom arm, the hydraulic fluid is directed to the cap side (blind end) of the cylinder. The pressure from the fluid pushes against the opposite side of the piston, retracting the piston rod and bringing the boom arm back toward the excavator. This retraction allows for compact storage of the boom arm when not in use.

6. Control Valves: The flow and direction of hydraulic fluid to the boom cylinder are controlled by hydraulic control valves. The equipment operator operates these valves and enables precise control of the boom arm's movement, including extension and retraction. The operator can adjust the boom arm's position and angle to suit the job's specific digging or lifting requirements.

7. Sealing: Seals are utilized in the hydraulic boom cylinder to prevent hydraulic fluid leakage and maintain pressure within the cylinder. They are positioned at various points, such as around the piston and piston rod, ensuring a tight seal and preventing fluid from escaping.

Application of Hydraulic Boom Cylinder

The hydraulic boom cylinder has extensive application in various industries requiring large excavators and heavy equipment. Here are some typical applications of hydraulic boom cylinders:

1. Excavation and Earthmoving: Hydraulic boom cylinders are crucial for excavators' digging and earthmoving operations. They enable the boom arm to extend and retract, allowing the excavator to reach different depths and distances. This capability is essential for digging trenches, excavating foundations, and removing large amounts of soil or debris.

2. Material Handling: Hydraulic boom cylinders are used in excavators for material handling applications. The extendable boom arm, controlled by the hydraulic cylinder, facilitates lifting, moving, and placing heavy objects such as rocks, concrete blocks, pipes, and other construction materials. The precise control offered by hydraulic systems ensures safe and efficient material handling operations.

3. Demolition: Hydraulic boom cylinders are vital in demolition projects. The boom arm, operated by the hydraulic cylinder, enables the excavator to reach and dismantle structures, such as buildings, bridges, and walls. The hydraulic cylinder provides the necessary force and control to manipulate the boom arm for precise and controlled demolition work.

4. Grading and Leveling: Hydraulic boom cylinders are utilized for grading and leveling applications. The extendable boom arm allows the excavator to reach elevated areas and effectively distribute materials, such as soil or gravel, to create even surfaces. The hydraulic cylinder helps adjust the boom arm's angle and position, enabling accurate grading and leveling operations.

5. Mining

We have a first-class independent R&D platform for assembly. The forklift cylinder production workshop has four semi-automatic lifting cylinder assembly lines and one fully automatic tilting cylinder assembly line, with a designed annual production capacity of 1 million pieces; the special cylinder workshop is equipped with semi-automatic cleaning and assembly systems of various specifications, with a designed annual production capacity of 200,000 essays. It has famous CNC machining equipment, machining centers, special equipment for high-precision cylinder processing, robot welding machines, automatic cleaning machines, automatic cylinder assembly machines, and automatic paint production lines. We have more than 300 sets of critical equipment running. The optimized allocation and efficient utilization of equipment resources ensure the precision requirements of the products and meet the high standard quality requirements of the products.

Painting & coating

Painting & coating line

Fully automatic water-based

Testing

To further improve product performance, and establish the leadership position of our hydraulic cylinder in the industry, our company and zjimee jointly established a Comprehensive performance laboratory of hydraulic cylinders, hydraulic valves, and hydraulic pumps; the lab is computer-assisted testing, using electro-hydraulic control technology, the test conditions preset by computer, which improves the test accuracy and system versatility, and the experimental data.
The automatic collection is realized through the application of sensors, and the output data, such as the internal leakage and load efficiency of the cylinder or the valve, are directly processed by the computer and converted to standard units (ml/min; %). At the same time, to ensure the working safety of the hydraulic system, the state monitoring function is carried out for key performance parameters, such as "oil temperature monitoring, liquid level monitoring, filter device monitoring," etc. Among them, the hydraulic cylinder test stand can test the performance of "load efficiency" and "internal leakage" by readings. At the same time, it is equipped with a grating ruler measuring instrument, which meets the requirements of all test items of hydraulic cylinder products in the national standard.