Beginner's Guide to Hydraulic System Pressure Cylinders | MachineMFG

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Beginner’s Guide to Hydraulic System Pressure Cylinders

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The Pressure Cylinder boasts an improved design that blends the benefits of both pneumatic and oil cylinders. The hydraulic oil is kept strictly separate from the compressed air, ensuring quick and efficient operation. The piston rod in the cylinder automatically starts upon contact with the workpiece, providing fast action speed.

Compared to pneumatic drive, the Pressure Cylinder offers greater stability and its simple design makes it easy to adjust the output force. Under similar conditions, it can deliver high output like hydraulic machines, while consuming low energy and providing a soft landing without damaging the die.

Additionally, installation is straightforward, as the Pressure Cylinder can be installed at any angle of 360 degrees, taking up minimal space. This results in fewer failures and no temperature rise.

Principle of the pressure cylinder

A Pressure Cylinder is a hydraulic component that boosts the input pressure to generate a higher output pressure. It is an integrated combination of a hydraulic cylinder and a turbocharger, which operates based on the ratio between the size of the supercharger and the pressure section area, as well as the principle of Pascal’s energy conservation.

The pressure cylinder works by utilizing the concept that when the size of the pressure area changes from large to small, the pressure also changes proportionally. This allows for a significant increase in air pressure, reaching dozens of times the original pressure.

Let’s take the Pressure Cylinder as an example:

When the working air pressure is applied to the surface of the hydraulic oil (or piston), the compressed air drives the hydraulic oil to flow into the pre-compression stroke chamber. The hydraulic oil then rapidly pushes the displacement component.

Once the working displacement encounters resistance that is greater than the air pressure, the cylinder stops moving. At this point, the pressurizing chamber of the Pressure Cylinder begins pressurizing, triggered by electrical signals (or pneumatic signals), to ultimately form the desired product.

Principle of the pressure cylinder

Characteristics of the pressure cylinder

The Pressure Cylinder boasts several advantages over traditional hydraulic and pneumatic systems:

  • High Speed: The Pressure Cylinder operates faster than hydraulic drive and is more stable than pneumatic drive.
  • User-friendly: The cylinder is easy to install, adjust the output, and maintain, making it a convenient option.
  • Large Output: The Pressure Cylinder can achieve high output like hydraulic machines under similar conditions, even without a pure pneumatic system.
  • Cost-effective: The unit cost of the equipment is lower compared to a hydraulic pressure system.
  • Easy Maintenance: The simple structure of the Pressure Cylinder makes maintenance easier compared to hydraulic systems.
  • Low Energy Consumption: The Pressure Cylinder does not require continuous operation like a pure hydraulic system, thereby saving energy and reducing power consumption by 10% to 30%.
  • No Leakage: The conversion of energy is convenient and there is no internal leakage, reducing the risk of environmental pollution.
  • Non-Destructive Dies: The punching pressure and working stroke can be adjusted to suit the process without damaging the dies.
  • Easy Installation: The Pressure Cylinder can be installed at any angle and position to accommodate various working conditions.
  • Soft Landing: The Pressure Cylinder features soft-touch technology for quiet operation and to protect dies.
  • Fewer Faults: The Pressure Cylinder does not experience the temperature rise issues that are common with hydraulic pressure systems.
  • Space-saving: The Pressure Cylinder occupies less space compared to traditional cylinders and hydraulic stations, taking up less than 50% of the area.
Characteristics of the pressure cylinder

Points for attention

As the pressure cylinder operates at high speed, it is prone to wear and tear, hence it is essential to follow the operating instructions. The working temperature range of the pressure cylinder is between -5℃ and 60℃, and the operating speed is 50 to 1000mm/s.

To ensure proper operation of the pressure cylinder, the following points should be considered:

  • Maintain Cleanliness: Before connecting the pressure cylinder to the gas pathway, make sure to remove any dust or debris from the pipeline and components to extend its service life.
  • Operate within Normal Air Pressure: The working air pressure of the cylinder must remain within the specified range in the inspection report and must not exceed the maximum working pressure.
  • Consider the Working Environment: The working environment temperature has been determined during the design phase of the cylinder. If the working environment temperature exceeds the specified range, please contact our technician. Avoid using the cylinder in complex environments, especially if it involves contact with chemical substances, as some components of the cylinder are made of iron.
  • Install an Effective Air Treatment Element: When connecting the cylinder in parallel, be sure to install an effective air treatment element (three-point combination) with lubrication and drainage treatment at the front end of the cylinder.
  • Do Not Change Hydraulic Oil Without Authorization: The VG68# anti-wear hydraulic oil has been selected as the hydraulic oil medium for the pressure cylinder. Do not change to any other liquid medium (such as oil or water) without proper authorization.
  • Follow the Procedure: The action program must be followed as specified in the gas pathway assembly diagram, including the preload action, boost action, pressurize and release, and preload reset.
  • Regular Maintenance: Regular maintenance and monitoring of the booster cylinder is crucial to ensure its stability and avoid any damage to the mold or workpiece.
  • Pressure Reducing Valve: To prevent excessive pressure during pressurization and protect your products, it is recommended to install a pressure reducing valve at the inlet of the pressurization section of the pressure cylinder.
  • Air Reservoir: To enhance the stability of the pressure cylinder, it is advisable to install an air reservoir in parallel between the triplex and the pressure cylinder whenever possible.
  • Replacing Hydraulic Oil: After using the booster cylinder for more than 50,000 cycles or over six months, it is recommended to replace all the hydraulic oil in the cylinder to increase its service life and improve its performance.

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