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Scissor fork-type aerial work vehicles, also known as scissor lifts, commonly utilize hydraulic cylinders to provide the vertical lifting function. These hydraulic cylinders play a crucial role in extending and retracting the scissor arms, allowing for the elevation of the work platform.
| bore diameter (D) | rod diameter (d) | stroke (S) | Installation distance (L) | working pressure | Interface dimensions (M) | weight |
| Φ65 | Φ45 | 840 | 1075 | 18MPa | G1/4;Φ6;M14*1.5 | 27kg |
How hydraulic cylinders are employed in scissor fork-type aerial work vehicles:
Hydraulic System: Scissor lifts incorporate a hydraulic system that consists of a hydraulic pump, reservoir, control valves, and hydraulic cylinders. The hydraulic pump pressurizes the hydraulic fluid, usually oil, and stores it in the pool. The control valves regulate the flow and direction of the hydraulic fluid to the cylinders.
Cylinder Configuration: Scissor lifts typically employ multiple hydraulic cylinders positioned vertically between the scissor arms. The cylinders are mounted at specific intervals along the length of the scissor arms to ensure even lifting and stability.
Extension and Retraction: When the hydraulic system is activated, hydraulic fluid is directed to the cylinders. The pressurized fluid is supplied to the bottom side of the cylinders, causing the piston rods to extend. This extension of the cylinders pushes the scissor arms apart, raising the work platform to the desired height.
Lifting Force: The hydraulic cylinders generate the lifting force required to raise the scissor arms and the work platform. The point is transmitted through the piston rods connected to the scissor arms. The number and size of the hydraulic cylinders depend on the lifting capacity and design of the scissor lift.
Control Mechanism: The control valves in the hydraulic system regulate the flow and direction of the hydraulic fluid to the cylinders. They are operated by the lift controls located on the scissor lift control panel or within the work platform. Operators can extend or retract the hydraulic cylinders by activating the control mechanism to adjust the platform height.
Safety Features: Scissor lifts often incorporate safety mechanisms such as pressure relief valves, emergency stop buttons, or limit switches to ensure safe operation. These features protect against overloading, excessive pressures, or unintended movements.
Maintenance: Regular maintenance of the hydraulic system, including the hydraulic cylinders, is essential for optimal performance and safety. This includes visual inspections, checking for leaks, monitoring fluid levels and condition, and following the manufacturer's recommended maintenance schedule.
What are some common maintenance tasks for hydraulic cylinders in scissor lifts?
Regular Visual Inspection: Conduct routine visual inspections of the hydraulic cylinders, including the cylinder bodies, piston rods, seals, and hydraulic connections. Look for signs of leakage, damage, or excessive wear. Inspect the seals for any indications of deterioration, cracks, or leakage. If any issues are detected, address them promptly.
Fluid Level and Condition: Monitor the hydraulic liquid level in the reservoir regularly. Ensure that it is at the recommended level. Additionally, check the condition of the hydraulic fluid for contamination, such as dirt, debris, or water. If the fluid appears dirty or contaminated, it may need to be replaced following the manufacturer's guidelines.
Seal Maintenance: The seals in hydraulic cylinders are critical in preventing fluid leakage. Keep the seals clean and inspect them for signs of wear or damage. Replace any worn or damaged seals according to the manufacturer's recommendations to maintain the sealing integrity.
Lubrication: Some hydraulic cylinders may require lubrication for the seals, piston rods, or other moving parts. Follow the manufacturer's lubrication frequency, type, and application method guidelines. Proper lubrication helps reduce friction, wear, and corrosion.
Cylinder Alignment and Mounting: Check the alignment and mounting of the hydraulic cylinders periodically. Ensure the cylinders are correctly aligned and securely mounted to the scissor arms or framework. Loose or misaligned cylinders can result in inefficient operation or premature wear.
Control System Maintenance: If the hydraulic cylinders are part of a more extensive hydraulic control system, inspect the control valves, switches, and other components periodically. Verify that they are functioning correctly, free from leaks, and properly adjusted. Clean or replace any clogged filters or screens.
Safety Checks: Regularly inspect and test any safety features associated with the hydraulic cylinders, such as pressure relief valves, emergency stop buttons, or limit switches. Ensure these safety mechanisms are in good working order and provide the necessary protection.
Manufacturer Guidelines: Adhere to the manufacturer's recommended maintenance procedures, schedules, and specifications for the hydraulic cylinders and the scissor lift. The manufacturer's guidelines may include specific maintenance intervals, torque values, and other important information.
Professional Servicing: Consult a qualified hydraulic technician or the manufacturer's service department for complex issues or major maintenance requirements. They can provide expert guidance troubleshooting support, and perform repairs or maintenance tasks as needed.
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