Basics of Hydraulic System Pressure Cylinder

The pressure cylinder is an improved design that combines the advantages of pneumatic cylinder and oil cylinder.

The hydraulic oil is strictly isolated from the compressed air, and the piston rod in the cylinder will start automatically after contact with the workpiece, with fast action speed.

It is more stable than the pneumatic drive and the cylinder device is simple, which is easy to adjust the output force.

Under the same conditions, it can reach the high output of the hydraulic machine, low energy consumption, and soft landing without damaging the die.

The installation is easy and the special pressure cylinder can be installed at any angle of 360 degrees, which occupies a small space, has fewer failures and no temperature rise etc.

Principle of the pressure cylinder

A pressure cylinder is a hydraulic element that converts the input pressure to a higher pressure output.

The pressure cylinder is an integrated combination of a hydraulic cylinder and a turbocharger, which works by using  the ratio of the size of the supercharger to the pressure section area and the principle of Pascal energy conservation.

Because the pressure does not change, when the pressure area changes from large to small, the pressure will also change with the size, so as to achieve the pressure effect of increasing the air pressure to dozens of times.

Take the pressure cylinder as an example:

When the working air pressure is on the surface of the hydraulic oil (or piston), the hydraulic oil will flow to the pre-compression stroke chamber under the action of compressed air.

At this time, the hydraulic oil will quickly push the type part for displacement.

When the working displacement encounters resistance greater than the air pressure, the cylinder stops moving.

At this time, the pressurizing chamber of the pressure cylinder starts pressurizing due to the action of electrical signals (or pneumatic signals) to achieve the purpose of forming products.

Principle of the pressure cylinder

Characteristics of the pressure cylinder

High speed: faster than hydraulic drive and more stable than pneumatic drive;

Easy to use: easy to install the cylinder, easy to adjust the output, easy to use and maintain;

Large output: The high output of a hydraulic machine can be reached under the same conditions, and it can be achieved by a non-pure pneumatic system;

Low price: the unit cost of equipment is lower than that of the oil pressure system;

Easy maintenance: Easy maintenance compared to hydraulic systems due to simple structure;

Low energy consumption: When the motor is continuously pressurized or stopped, it does not have to run continuously like a pure hydraulic system, so energy is saved, and the power source is easily accessible, the actual energy consumption is 10%-30% of the hydraulic system;

No leakage: The energy can be conveniently converted to zero internal leakage without worrying about environmental pollution;

Non-destructive dies: The punching pressure and working stroke can be steplessly adjusted within a defined range to suit the process;

Easy installation: there are various installation methods, which can be installed at any angle and position according to different working places;

Soft landing: Stamping with soft-touch technology for quiet operation and to protect your dies;

Fewer faults: Without the problem of oil pressure system temperature rise;

Small space: Compared to ordinary cylinders and hydraulic stations, the space occupied can be less than 50% of the area.

Characteristics of the pressure cylinder

Points for attention

Since the pressure cylinder is always running at high speed, which is easy to cause wear and tear on the machine, so it should be operated according to the operating instructions.

The working temperature of the pressure cylinder is around -5℃~60℃, and the operating speed is 50~1000mm/s.

In order to ensure proper operation of the pressure cylinder, the following points should be noted in use:

Keep it clean: Before connecting the pressure cylinder to the gas path, please remove dust and other debris from the pipeline and components to avoid reducing the service life of the pressure cylinder.

Use within the normal air pressure range: The working air pressure of the cylinder during normal use must work within the working air pressure range specified in the inspection report, and shall not exceed the specified working pressure.

Pay attention to the working environment of the booster cylinder:

The temperature in the working environment of the cylinder has been determined during the design.

If the working environment needs to be changed due to work and the temperature exceeds the temperature, please contact our technician.

As part of the components in the cylinder are made of iron, please do not use them in a particularly complex environment (if there is a chemical substance contact environment).

Please also install an effective air treatment element (three-point combination) at the front end of the cylinder with lubrication and drainage treatment when connecting in parallel.

Do not add other hydraulic oil without authorization: The hydraulic oil medium selected in the design of the pressure cylinder is VG68# anti-wear hydraulic oil, and other liquid mediums (such as oil, water, etc.) cannot be changed without authorization.

Be sure to follow the procedure:

The action program must work according to the action program of the gas path assembly diagram:

  • Preload action
  • Boost action
  • Pressurize and release
  • Preload reset

Pay attention to maintenance and frequently check the operation of the booster cylinder

In order to avoid excessive pressure when the cylinder moves during pressurization and damage your mold or workpiece, please install a pressure reducing valve at the inlet of the pressurization section of the pressurization cylinder to effectively protect your products.

To ensure the stability of the pressure cylinder, it is recommended to install an air reservoir in parallel between the triplex and the pressure cylinder as much as possible.

When using the booster cylinder for more than 50,000 times or more than half a year, it is recommended to replace all the hydraulic oil in the cylinder once to increase the service life and working life of the cylinder.

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