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A single-acting hollow plunger hydraulic cylinder is a type of hydraulic actuator that uses fluid pressure to extend the plunger while relying on an external force, like gravity or a spring, to retract it. Here are some key features and characteristics:

Design

• Hollow Plunger: The plunger is hollow, allowing for other components, such as rods or tools, to be inserted or operated through it.
• Single-Acting: It operates in one direction; hydraulic fluid is applied to one side of the piston to extend it, and the retraction happens due to an external force.

Operation

• Extension: When hydraulic fluid is pumped into the cylinder, it creates pressure that pushes the plunger outwards.
• Retraction: Once the pressure is released, the plunger returns to its original position through external forces.

Applications

• Lifting and Positioning: Commonly used in applications where lifting or positioning is required, such as in construction, manufacturing, and material handling.
• Mold Opening/Closing: Often used in die-casting or molding processes.

Advantages

• Simplicity: Fewer components compared to double-acting cylinders, which can mean easier maintenance.
• Cost-Effective: Generally more affordable due to their simpler design.

Disadvantages

• Limited Force in One Direction: Only provides power in one direction, requiring additional mechanisms for retraction.
• Dependency on External Forces: The efficiency of operation can depend on gravity or springs.

1. Hollow Design: The hollow center allows for easy access to the interior, which can be beneficial for certain applications, like threading tools or rods through the cylinder.

2. Piston Mechanism: The piston within the cylinder is designed to handle high pressures while minimizing friction. This ensures smooth operation during extension.

3. Seals: Effective sealing is crucial to prevent hydraulic fluid leakage. Seals are typically designed to withstand high pressures and environmental conditions.

4. Mounting Options: Many cylinders come with various mounting configurations, allowing for flexible installation in different setups.

Advantages

1. Space Efficiency: The hollow design can save space and allow for more compact machinery setups.

2. Less Complexity: With fewer moving parts, single-acting cylinders can be easier to troubleshoot and repair.

3. Weight Reduction: They are generally lighter than double-acting cylinders, which can be a significant factor in mobile applications.

4. Cost-Effective: Lower initial investment and maintenance costs compared to more complex hydraulic systems.

Limitations

1. Retracting Mechanism: Since retraction relies on external forces, systems must be designed to ensure these forces are sufficient, which can complicate design.

2. Power Limitations: They may not be suitable for applications requiring high retraction forces, as the hydraulic system can only provide power for extension.

3. Fluid Dependency: Performance can be affected by fluid viscosity and temperature; proper fluid selection and maintenance are necessary.

Typical Applications

1. Construction Equipment: Used in jacks and lifts for raising heavy loads, where gravity assists in retraction.

2. Manufacturing: Common in automation processes where items need to be pushed or pulled with precision.

3. Automotive Repair: Hydraulic jacks utilize single-acting cylinders to lift vehicles safely.

Hydraulic cylinder low-height jacks with a plain ram are specialized jacks designed to operate effectively in environments with minimal clearance. These jacks are ideal for lifting heavy loads when there isn’t enough space for a traditional jack. They have a low-profile design and utilize a plain ram (non-threaded) to provide lifting capability without fine adjustments.

Specifications for Hydraulic Cylinder Low-Height Jacks with Plain Ram1. General Specifications

• Model: [Specific Model Name]
• Manufacturer: [Manufacturer Name]
• Type: Low-Height Hydraulic Cylinder Jack with Plain Ram

2. Lifting Capacity

• Maximum Load Capacity:
  • Range: Typically from 2 tons (4,000 lbs) to 20 tons (40,000 lbs) depending on the model.
  • Units: Tons or pounds (lbs).

3. Dimensions

• Minimum Height:
  • Range: 2 inches (51 mm) to 6 inches (152 mm). This is the lowest height the jack can achieve, allowing it to fit under very low-clearance vehicles or equipment.
• Maximum Height:
  • Range: 8 inches (203 mm) to 15 inches (381 mm). This indicates how high the jack can lift a load.
• Diameter of Base:
  • Range: 6 inches (152 mm) to 12 inches (305 mm). A larger diameter base provides stability during lifting.

4. Weight

• Net Weight:
  • Range: 30 lbs (14 kg) to 70 lbs (32 kg). Heavier models are typically designed for higher capacities.
• Shipping Weight: Slightly higher due to packaging.

5. Construction

• Material:
  • Primary Material: High-strength steel or aluminum alloy to ensure durability and load-bearing capability.
• Finish:
  • Type: Powder-coated or corrosion-resistant finish to prevent rust and wear.

6. Hydraulic System

• Hydraulic Fluid Capacity:
  • Range: 0.3 gallons (1.1 liters) to 0.6 gallons (2.3 liters). The fluid capacity impacts the jack's lifting efficiency.
• Pump Mechanism:
  • Type: Manual hand pump or optional powered pump (electric or pneumatic) for easier operation.
• Hydraulic Fluid Type:
  • Common Fluids: Mineral oils or other hydraulic fluids as specified by the manufacturer.

7. Plain Ram Features

• Ram Type:
  • Design: Plain ram, which provides vertical lifting without fine adjustment threads.
• Material:
  • Construction: Made from hardened steel or alloy for strength and durability.

8. Safety Features

• Relief Valve:
  • Purpose: Prevents overloading by releasing excess pressure to protect the hydraulic system.
• Safety Lock:
  • Feature: Some models include a safety lock to secure the jack at the desired height.

9. Handle and Operation

• Handle Length:
  • Range: 24 inches (610 mm) to 30 inches (762 mm). Provides leverage for ease of use.
• Material:
  • Construction: Steel or reinforced composite for strength.

10. Portability

• Casters/Wheels:
  • Option: Some models come with wheels or casters for easier mobility, especially useful in workshops.
• Carrying Handle:
  • Feature: Integrated handle for easier transport.