hydraulic cylinders play a central role in many technical systems. In this comprehensive overview, we not only offer the latest innovations in the industry but also basic knowledge. You will also receive practical tips Troubleshooting with defective hydraulic cylinders and exciting insights into them Applications of linear actuatore. Trust in the manufacturers’ in-depth expert knowledge and stay up to date.

Contents

• High-performance electro-hydraulic drive system
• How do you repair a hydraulic cylinder?
• Hydraulic cylinders in a class of their own
• Electrically controlled servo-hydraulic compact axes
• Hydraulic cylinder in tie rod and block version, linearly damped
• Hydraulic cylinders in the modernized hydroelectric power plant
• Basics of hydraulic cylinders
  
  

High-performance electro-hydraulic drive system

Sep 06.09.2023, XNUMX | The physical ones Advantages of hydraulics are compact design, high force density and wear resistance. When it comes to electro-hydraulic axles, they are easy to install, energy efficient and steering supplemented by software.

Electro-hydraulic Linear axes have been established by various manufacturers in recent years. However, due to their rated power, the electro-hydraulic compact axes on the market are mainly suitable for automation tasks or use in machine tools.

Hunger hydraulics is now expanding the range of applications with the Hunger Drive. This offers a nominal force of 2500 kN. True to the motto: #howbigdoyouwantit, significantly higher nominal loads can also be taken into account.

How do you repair a hydraulic cylinder?

November 17.11.2022, XNUMX | Hydraulic cylinders are used to transmit power from one Motor or a hydraulic pump on other parts. These are from Construction to presses can be found in all areas. There are many reasons for hydraulic cylinder failure. Cycon tells you about the most common ones Damage and causes.

Most common causes of defective hydraulic cylinders

1. The most common damage to hydraulic cylinders is a leak, which should be resolved as soon as possible.
2. A hydraulic cylinder is exposed to high pressures and temperatures. The materials and accessories used must also withstand these conditions. A common reason for broken hydraulic cylinders is unsuitable ones Materials.
3. Another reason is this improper installation. If the cylinder is installed incorrectly, it may not function properly when put into operation.
4. Hydraulic cylinders should only be used by trained professionals to be served. Because they know how they work and how to maintain them.

Most common damage to hydraulic cylinders

1. By far the most common damage to hydraulic cylinders is Leaks and the associated leakage of hydraulic fluids.
2. Another type of damage is bent or cracked Piston rods, which are caused by overloading or clogging of the cylinder.
3. Leadership elements are damaged in the cylinder due to lateral forces or foreign objects.
4. Or foreign bodies in the cylinder cause grooves to form on the running and guide surfaces.
5. The way food is chrome coating on the piston side can be damaged by force and the resulting chipping of the coating.
6. Other types of damage occur when attached to hydraulic cylinders mechanical components wear out or become overloaded.

Cycon repairs defective hydraulic cylinders

Since then 1970s Cycon repairs defective hydraulic cylinders. The company has decades of experience repairing hydraulic cylinders from numerous manufacturers and brands. All work from eliminating leaks to repairing massive damage is carried out in our own production facility.

Hydraulic cylinders in a class of their own

July 16.07.2021, XNUMX | A huge hydraulic cylinder leaves the Hunger Factory halls in Lohr am Main and is transported to the end customer in Shanghai. Engineering, material procurement and manufacturing of this 200 t hydraulic cylinder presented a particular challenge. The hydraulic cylinder is used on an offshore platform, where it moves an approximately 140 m long, crane-like boom.

All materials were specially manufactured. The largest components such as the cylinder tube and piston rod had to be from several parts be welded together. The travel-sized hydraulic cylinder corresponds to the most modern standard in cylinder construction. The piston rod is equipped with a combined laserCeramicsCoating protects against corrosion and wear, low-friction seals ensure smooth running and the spherical bearings for attaching the cylinder are maintenance-free.

Thanks to hydraulic Security block The hydraulic cylinder can safely support the load under all circumstances, even if a hose line bursts or other malfunctions occur in the system. The hydraulic cylinder is one of the largest in the world with a 1400 mm piston diameter, 15.800 mm stroke, a total length of 23,5 m and a maximum pressure force of 3000 t.

200 t cylinders on the heavy transport truck

Initially the 200 t cylinder was equipped with a Heavy-duty transporter transported from the Hunger factory premises to the inland waterway ship pier in Lohr am Main, 2 km away. The enormous weight of the cylinder was distributed over 22 individually controllable and height-adjustable axes. Two 500 t mobile cranes were available for loading onto an inland waterway vessel. It seemed to float effortlessly between the cranes and was finally lowered into the hull. When the hydraulic cylinder was lowered, the 750 t inland waterway vessel immediately increased its draft by 40 cm.

Electrically controlled servo-hydraulic compact axes

29.06.2021 | Bosch Rexroth is expanding its offering in the area of ​​electrically controlled, servo-hydraulic systems by adopting an extensive technology package compact axes. The technology now adopted from EH-D and Onovum expands the portfolio into the range below 10 kW.

To the post

Hydraulic cylinder in tie rod and block version, linearly damped

05.10.2017 | AHP Merkle presents its newly developed linear damping for hydraulic cylinders such as tie rod cylinders or block cylinders. The damping process is significantly faster and yet gentler to use. The designer can also easily calculate them and therefore design them better than is the case with solutions currently on the market.

Tie rod cylinder and block cylinder

In the new Tie rod cylinder ZHZ 160, the linear cushioning is already available as standard. As with all products from AHP Merkle, this hydraulic cylinder is also equipped with hardened and hard-chrome-plated piston rods as standard. The tie rod cylinder is designed according to DIN / ISO 6020/2. 

Hawe Hydraulik merges production plants in China

The new Block cylinder with inductive Switches BZP 501 is more compact and cheaper than previous hydraulic cylinders with inductive switches. The block cylinder has a switching point that can be adjusted in the end position by at least 8 mm. In addition, this hydraulic cylinder including switches will also be available as a high-temperature version with up to 140 °C. 

First locking cylinder 

Last but not least, the hydraulics specialist is also providing a first catalog Locking cylinder in front. Two dimensions are already available as catalog items, and larger locking cylinders will also be available from October.

Hydraulic cylinders in the modernized hydroelectric power plant

12.08.2010/XNUMX/XNUMX | That Unterereichen hydroelectric power station is currently being modernized. Six new machines, each consisting of a generator and a Francis single-chamber two-wheel turbine, will be put into operation over the course of two years. During the renovation, two of the three machines are running and one is shut down. The machines are delivered and installed by Andritz Hydro, which in turn are equipped with hydraulic cylinders from Hydropneu equipped.

While this water turbine was originally designed for relatively low head heights, very different head heights can now be used with this type of turbine. The Impeller surrounds a guide device that regulates the water flow by adjusting the rotating blades of the guide device. This guide is controlled by two double-acting hydraulic cylinders. These cylinders with mechanical locking of the piston rod are custom-made by Hydropneu.

Important functions of the hydraulic cylinders

In addition to a very high Locking force The working cylinders have various other important functions that are required for this application. The mechanical locking of this cylinder positively blocks the piston rod. With the new development, the locking segments still move into the locking position even if the hydraulic supply fails.

Servohydraulics | Calculator and new developments

The position of the Piston rod is continuously integrated via an transducer recorded. Together with a corresponding proportional valve control, it can be used to display a complete position and speed control. The locking itself is also monitored by a pressure-proof proximity switch. The hydraulic damping in the cylinder enables a soft, low-vibration approach to the end position.

Untere Iller Aktiengesellschaft on the Iller Canal

Untere Iller Aktiengesellschaft (UIAG) operates and generates three power plants since 1932 Electricity from hydropower on the Iller Canal between Altenstadt and Illertissen. The UIAG hydroelectric power plants in Altenstadt, Untereichen and Au supply 100 million kWh of electrical energy from renewable sources every year. This means that around 30.000 households can be supplied with environmentally friendly electricity all year round.

Small hydropower is not only an economical and environmentally friendly source of energy, but also has positive effects on the habitat of people and animals. The turbines of the small hydroelectric power plants whirl oxygen into the water. This favors the Preservation of fish stocks. In addition, power plants and power plant rooms can contribute to flood protection.

Basics of hydraulic cylinders

How is a hydraulic cylinder constructed?

The structure of a hydraulic cylinder essentially consists of five main components: The cylinder tube serves as a housing in which the piston moves up and down, thereby transmitting the hydraulic force generated. The piston rod transmits the movement and force of the piston to the outside. Piston seal, rod seal and housing seal ensure that the hydraulic oil stays in the system and no foreign objects enter. End caps close the cylinder at both ends and are usually provided with the connections for the hydraulic fluid. How a hydraulic cylinder works: When hydraulic oil is fed into the cylinder under pressure, it moves the piston, which in turn moves the piston rod and thus performs mechanical work.

What types of hydraulic cylinders are there?

The most common designs of hydraulic cylinders are:

1. Single acting cylinders: Pressure is applied to only one side of the piston to create movement. The return movement is caused by an external force, e.g. B. a feather. Single-acting cylinders include:
   • Telescopic cylinder consists of multiple cylinder stages that are nested within each other and can extend sequentially to achieve a longer overall movement.
   • Plunger piston cylinder, also known as plunger cylinders, have a piston that is firmly connected to the piston rod. A stop prevents it from extending too far. It is suitable for high forces in short strokes.
2. Double-acting cylinders: Pressure can be applied to both sides of the piston, allowing it to move both forward and backward.
   • Differential cylinder with surfaces of different sizes on which the pressure acts on the front and back of the piston. This leads to different forces and speeds.
   • Synchronous cylinder with multiple piston rods that move simultaneously and evenly resulting in an even distribution of force. This cylinder is often used in lifting and hoisting applications.
   • Tandem cylinder with two cylinder chambers connected in series, where the output of one cylinder is connected to the input of the next cylinder. It is suitable for longer strokes and increased forces.
   • ISO standard cylinder are standardized cylinders according to ISO standards with uniform dimensions and connections.

Where are hydraulic cylinders used?

Hydraulic cylinders are in demand in many industries and applications due to their ability to convert high forces into linear movement. The versatility of hydraulic cylinders enables their use in almost every area, where precise and powerful linear movements are required. The most common areas of application include:

• Mechanical engineering: in machine tools, presses or injection molding machines for power transmission
• Construction: in construction machines such as excavators, cranes or concrete mixers to control movements
• Agriculture: in tractors, combine harvesters or harvesters to control attachments
• Automotive industry: in lifting platforms, brakes or chassis systems
• Shipping: For controlling steering systems or loading cranes on board ships
• Energy generation: in hydroelectric power plants to regulate locks or valves

Source: This article is based on information from the following companies: AHP Merkle, Bosch Rexroth, Cycon, Hunger Hydraulik, Hydropneu.

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