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In a scissor fork-type aerial work vehicle, the steering system controls the car's direction. Some scissor lifts utilize double-acting steering cylinders to facilitate steering movements.
| bore diameter (D) | rod diameter (d) | stroke (S) | Installation distance (L) | working pressure | Interface dimensions (M) | weight |
| Φ40 | Φ20 | 125 | 400 | 20MPa | 2-G1/4 | 3kg |
Here's an explanation of how double-acting steering cylinders work in scissor-fork-type aerial work vehicles:
Hydraulic System: The hydraulic system in the scissor lift includes 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: Double-acting steering cylinders are typically used in scissor lifts, which can generate force in both directions. These cylinders are usually mounted on the front axle or other appropriate locations in the steering mechanism.
Steering Operation: When the operator activates the steering controls, the control valves direct pressurized hydraulic fluid to one side of the steering cylinder. This causes the piston inside the cylinder to extend, applying force to the steering mechanism. The energy generated by the cylinder assists in turning the front wheels or controlling the steering mechanism, enabling the scissor lift to change direction.
Return Stroke: Once the desired steering movement is achieved, the operator releases the steering control, and the control valves redirect the hydraulic fluid to the opposite side of the steering cylinder. The pressurized fluid acts on the other side of the piston, causing it to retract and return to its original position.
Control Mechanism: The control valves in the hydraulic system play a vital role in regulating the flow and direction of the hydraulic fluid to the steering cylinders. The operator controls the steering through the steering controls located in the scissor lift's operator platform or control panel.
Maintenance: Proper hydraulic system maintenance, including the double-acting steering cylinders, is essential for optimal performance and safety. This includes regular visual inspections, checking for leaks, monitoring fluid levels and condition, and adhering to the manufacturer's recommended maintenance schedule.
Are there any safety precautions or guidelines to follow when operating a scissor fork-type aerial work vehicle?
Operator Training: Only trained and authorized personnel should operate scissor lifts. Operators should receive proper training on the safe operation, controls, and emergency procedures specific to their model. Familiarize yourself with the operator's manual and any additional guidelines the manufacturer provides.
Pre-Operation Inspection: Conduct a pre-operation inspection before each use. Check for any damage, loose or missing parts, hydraulic leaks, or other potential hazards. Ensure that all safety devices, such as guardrails and safety interlocks, are in place and functioning correctly.
Stable Surface: Set up the scissor lift on a firm, level surface that can support the weight of the lift and the maximum intended load. Avoid uneven or unstable ground, slopes, or surfaces prone to sinking or shifting. If necessary, use outriggers or stabilizers as per the manufacturer's instructions.
Load Capacity: Adhere to the scissor lift's load capacity limits specified by the manufacturer. Do not exceed the maximum weight capacity, including the weight of operators, tools, and materials. Distribute the load evenly on the platform and avoid sudden movements or overloading on one side.
Fall Protection: Whenever working at heights, operators should wear appropriate personal fall protection equipment, such as a harness and lanyard, and be attached to an approved anchor point. Ensure the scissor lift is equipped with guardrails or other fall protection mechanisms, and use them as intended.
Platform Safety: Do not climb or stand on the guardrails, or lean out of the platform. Keep the platform floor clear of debris or obstacles that may cause slips, trips, or falls. Do not override or disable any safety devices or controls.
Operating Conditions: Consider the weather conditions before operating the scissor lift. Avoid using the ride during high winds, storms, or other adverse weather conditions that may impact stability or safety. Be cautious of overhead obstacles, power lines, or other hazards in the work area.
Controlled Movements: Operate the scissor lift smoothly and avoid sudden or jerky movements. Use the controls gradually and maintain a safe speed. Be aware of the position of the scissor arms, platform, and other moving parts while operating the lift.
Communication and Awareness: Maintain clear communication with ground personnel and ensure they know your movements. Use warning signals, such as horns or alarms, to alert others nearby. Be cautious of pedestrians, vehicles, or other equipment in the area.
Emergency Procedures: Familiarize yourself with the scissor lift's emergency procedures, including lowering the platform in case of power failure or other emergencies. Keep emergency contact information readily available.
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