Hydraulic cylinders are fairly common mechanisms that are used in all types of special equipment (excavators, truck cranes, bulldozers, aerial platforms, cranes, manipulators, concrete pumps, loaders, compressors, dump trucks, hydraulic hammers, graders, etc.). The principle of operation of a hydraulic cylinder is similar to a pneumatic cylinder, only instead of air in hydraulic cylinders, the driving force becomes liquid - water or oil.
The KASCAD company has been specializing in the manufacture and repair of hydraulic and pneumatic units for machinery and machine tools, presses and other production equipment for more than 20 years.
Hydraulic cylinders come in two types of action – single-acting and double-acting. Single-ended cylinders can only operate in one direction. They are driven by the increasing pressure of the working fluid in the cylinder cavity. They return to their initial position using the work of the spring. As for double-sided pistons, they are more powerful than single-sided pistons, since when the hydraulic cylinder is activated, it does not need to overcome the return force of the spring. In addition, double-acting hydraulic cylinders can operate in two directions.
There are also telescopic hydraulic cylinders. They are necessary in order to ensure, with a small size of the cylinder itself, a larger stroke of the piston rod, which is necessary for the operation of cranes for various purposes. Cylinders of this type are also used in trucks to lift the vehicle body.
Characteristics of hydraulic cylinders and their types
Hydraulic cylinders are an important, highly loaded part of mechanisms used in the production of machine tools, hydraulic presses, special equipment, as well as a huge amount of special equipment (excavators, loaders, tractors, all kinds of lifting devices and mechanisms).
Also, the use of hydraulic cylinders is relatively safe and quite simple. The movements produced by the piston along a reciprocating trajectory make it possible to transfer force in the desired direction. This process is based on the principle of the hydrostatic effect of a liquid column on the hydraulic cylinder rod. Therefore, the use of various types of hydraulic cylinders is very common. In turn, designers are trying to constantly refine and improve hydraulic cylinders for emerging tasks.
The classification of hydraulic cylinders arises from the design features of the device, as a result of which all hydraulic cylinders are divided into single-sided and double-sided. The difference between single-sided and double-sided hydraulic cylinders is that the reverse stroke of the hydraulic cylinder rod occurs due to the influence of external driven force, while double-sided ones have a working stroke in both directions.
Hydraulic cylinders can also be classified according to the type of operation of the device. In this case, we can distinguish the main ones - telescopic, rotary and piston hydraulic cylinders. Rotary hydraulic cylinders are used when it is necessary to deform some equipment; piston cylinders with a double-sided action are often used in drives of various special equipment.
Very often, in the production of special equipment, telescopic cylinders are used, which can contain two or more nested individual cylinders. Such hydraulic cylinders use the force principle, so that the total stroke of the rods exceeds the length of the cylinder body itself. Telescopic power cylinders are mainly used in the production of truck cranes.
An important parameter when choosing a hydraulic cylinder is the (nominal) pressure, stroke and diameter of the rod and piston. The fundamental factor, of course, is the rated power of the hydraulic cylinder itself, and the diameter of the piston and rod characterize the working force exerted by the device.
Components
Hydraulic cylinder components
The hydraulic cylinder consists of the following parts:
- Stock
- Piston
- Sleeve (is the body)
- Piston seals
- Books
- Back cover
The chambers in the hydraulic cylinder must be sealed. To achieve this goal, special seals are installed on the piston - cuffs that prevent fluid from flowing through the piston. Also, the cuffs are placed on the axle box, here they act as seals. The axle box is also equipped with a wiper to prevent particles from the external environment of the device from getting into the inside of the cylinder.
Important: The seals on the piston do not work if there are roughness and scratches inside the liner. The inside of the liner is ground by special machines at the factory to achieve a relatively perfectly smooth state.
The device of hydraulic cylinders.
A hydraulic cylinder is the simplest example of an engine. The output (moving) link, which can be a rod, a plunger, or the cylinder body itself, carries out a reciprocating movement.
The main parameters that characterize all hydraulic cylinders are the internal diameter, piston stroke, rod diameter and nominal pressure of the working fluid.
Name of hydraulic cylinder components:
Cover – 1; Sleeve – 2; Nut – 3; Ring – 4; Washer – 5; Cuff – 6; Ring – 7; Piston – 8; Ring – 9; Washer – 10; Spring ring – 11; Collar ring – 12; Cuff – 13; Ring – 14; Cover – 15; Wiper – 16; Spring ring – 17; Bearing – 18; Stock – 19; Bushing – 20.
Hydraulic cylinders come in several types: piston, telescopic, plunger, double-acting and single-acting. Based on the type of fastening, hydraulic cylinders are divided into models with hinged and rigid mounting.
A single-acting hydraulic cylinder exerts a force on the moving link, which is directed only in one direction (the working stroke of the cylinder). In the opposite direction, the moving link simply moves back under the influence of gravity or a return mechanism such as a spring. These cylinders have only one working plane.
Double-acting hydraulic cylinders have slightly more capabilities. They have two working planes, that is, they can create working forces on the output link in two directions. To ensure reciprocating motion, the liquid is alternately supplied under pressure into the cylinder cavity. When one of the cavities is filled with liquid, the other is connected to the drain. The hydraulic cylinder has two cavities: the rod cavity, in which the rod is located, and the piston cavity.
A variety of hydraulic cylinders that can be purchased on the Russian market
In Russia, the range of hydraulic cylinders is simply huge - the market contains products from domestic manufacturers and foreign brands, both elite brands and companies operating in the budget segment. Imported units also differ in their country of origin, and their cost depends on this: products from Japan, the USA, and the European Union are the most expensive, products from the CIS are slightly cheaper, the lowest prices are for Chinese units, although options are possible here.
In addition to the manufacturer and region of origin, hydraulic cylinders have other differences, for example:
- specificity of action - one-sided models perform work only in one direction of movement of the rod, two-sided models - in two;
- structural features - units can have a simple or telescopic device, have or not have step extension limiters;
- a return mechanism, which can be a spring, another hydraulic cylinder, gravity generated by a raised load, etc.;
- operating parameters and capabilities, options;
- materials used in production and coating;
- intended purpose - some models are installed to work with the body part, others - in the steering, and others - for industrial equipment (conveyor, press);
- arrangement of lower and upper stages, their resistance to inertia;
- installation location on the supporting vehicle - hydraulic cylinders can be installed in the front part or under the body;
- type of fasteners, which include threaded joints, trunnions, lugs, flanges, welding, etc.;
- connection diagram to other hydraulic elements, which can be either differential or ring;
- dimensions and weight of the product.
Choosing the right hydraulic cylinder is only half the battle. The buyer also faces other tasks - purchasing a unit at a fair price, correct installation, ensuring optimal operating conditions, regular inspection, maintenance and timely repairs.
The best hydraulic cylinder store in Russia
Hydraulic cylinders can be found on the windows of various companies that operate on the Russian market. But you should only buy in those stores that:
- have been working in this field for more than five years and have a good reputation;
- have a large selection of goods for every taste and budget;
- offer only original and new products with documents;
- have their own warehouses and a certified service center with a full range of services;
- adhere to a moderate pricing policy, ideally they are dealers of reliable and trusted manufacturers;
- offer competent assistance and advice, support at all stages of the purchase;
- provided various options for payment for goods and delivery throughout the country and abroad.
All these requirements are met by the Hydroleader online store, which is well known to our compatriots and enjoys their trust. If you need a high-quality hydraulic cylinder at an adequate price, then contact us!
Hydraulic cylinders - manufacturing and repair in Nizhny Novgorod
Even if you know the structure of a hydraulic cylinder very well, repairing it at home or assembling your own cylinder is quite a difficult task. This requires special equipment and skills. Therefore, it is better to turn to experienced professionals with such questions. specializes in the repair of hydraulic cylinders, as well as the manufacture of hydraulic cylinders according to your orders.
Our company deals with the full range of work related to hydraulic cylinders. Our workers repair hydraulic cylinder rods, repair hydraulic cylinders for special equipment, such as loaders, asphalt pavers, excavators, concrete pumps, truck cranes, manipulator cranes, other construction and municipal equipment and production machines. We can also manufacture a hydraulic cylinder according to the drawings or samples you provide. We guarantee high quality and short terms of work.
Buy hydraulic cylinders : single-acting, double-acting, plunger, telescopic, double-rod and tandem, outriggers, hydraulic cylinders with stroke damping. Low prices.
Buy spare parts and components for hydraulic cylinders : axle boxes, pistons, seals, eyes, bonnets, rods.
Hydraulic cylinder repair : professional, fast, quality guaranteed.
Hydraulic cylinder - device, operating principle, force calculation
The performance of many types of power equipment, both industrial and domestic, is ensured by a device such as a hydraulic cylinder. Acting as a reciprocating drive motor, such a mechanism, with minimal energy consumption, ensures a full cycle of operation of power equipment used in construction, in various industries, in agricultural enterprises and in everyday life. Hydraulic cylinders are most widely used as the main element of equipment for pressing equipment, which is actively used to solve various problems.
A hydraulic cylinder is a volumetric hydraulic motor that converts the energy of fluid flow into mechanical energy
Advantages of the new one-way hydraulic cylinders
It is by no means unimportant to use new hydraulic equipment from a trusted manufacturer, and not used. With the following mechanisms:
- the likelihood of a quick breakdown is reduced, and therefore the subsequent costs of repairing or replacing the device;
- in the event of early or frequent failure of the hydraulic cylinder, the entire work process where it is involved will be slowed down, which is fraught with losses;
- a new device implies coordinated operation without any complaints, while previously used equipment may not work correctly, have lower efficiency or higher consumption of consumables (for example, hydraulic fluid);
- If suddenly problems arise when working with new equipment, the warranty that applies to it allows you to carry out all the necessary work regarding troubleshooting for free!
Among other things, correctly selected and installed equipment is of great importance in the coordinated operation of special equipment. Specialized professionals will help you solve such problems and will provide an extensive selection of imported hydraulic equipment and offers from domestic manufacturers - all at reasonable prices!
