an introduction

 An introduction

1.1 Overview of the hydraulic transmission and control

hydraulic transmission and control of a liquid (oil, high water-based hydraulic fluids, synthetic liquid) as a medium to achieve the types of machines in the amount of output (force, displacement or velocity,cheap UGG boots, etc.). It with a simple mechanical drive, electrical drive systems and components, compared with a transmission power, the structure of small, fast response characteristics, which are widely used in various mechanical equipment and sophisticated automatic control system. Hydraulic transmission technology is a new discipline techniques, although its short history, but the speed of development is very fast. Since 1795, made the first presses, the hydraulic technology into the engineering field; 1906 weapons for national defense preparedness.

during World War II, due to the urgent need for fast response the military industry, high precision automatic control system, resulting in a hydraulic servo control system. From the 60s onwards, the atomic energy, space technology, large ships and the development of electronic technology, constantly on the new demands on the hydraulic technology from civilian to defense, from the usual drive to the high precision control system, which technology has been developed and applied more widely.

in the defense industry: sea, land and air combat weapons of all kinds are used hydraulic transmission and control. Such as aircraft, tanks, ships, radar, artillery, missiles and rockets.

in the civilian industry: a machine tool industry, metallurgy industry, engineering machinery, agriculture, automobile industry, textile industry, shipbuilding industry.

In addition, in recent years has emerged sun-tracking system, the wave simulator, driving simulator aircraft, ship driving simulator, earthquake reproduction, rocket assisted launch device, aerospace, environmental simulation,UGG bailey button, vibration system and emergency high-rise buildings braking devices, hydraulic technology are used.

short, all engineering fields, where there are machinery and equipment of the occasion, both hydraulic technology. It's growing so quickly, the application is so broad, the reason is that the hydraulic technology has excellent features,bailey UGG boots, summarized in hydraulic power transmission mode has significant advantages: the unit weight of output power and unit size of output power; hydraulic actuator volume Small, compact and flexible layout, easy to realize stepless speed, wide speed range, easy to match with the electrical control automation; easy to implement overload protection and holding,Discount UGG boots, safe and reliable; components easy to implement serialization, standardization, universal ; hydraulic easily with computer control and other new technology, constitutes a

1.2 Hydraulic characteristics of the development and process

molding hydraulic machine is the production of one of the most widely used devices, since the 19th century and developed rapidly since the advent of the hydraulic machine in a wide range of adaptability in the work to make it won in the national economic sectors a wide range of applications. As the hydraulic machine hydraulic system and the whole structure, is relatively mature, the development of hydraulic press at home and abroad not only in control systems, also mainly in the high-speed, high efficiency, low energy consumption; hydraulic integration in order to fully and rationally utilizing advanced mechanical and electronic technology for improving the hydraulic system; automation and intelligence to realize the automatic system diagnostic and adjustment, with the fault pre-processing; hydraulic component integration, standardization, in order to effectively prevent leakage and contamination in four areas .

as the two major components of hydraulic machines and hydraulic system of the host, due to mature technology, no large gap between domestic and foreign models, the main difference is that processing and installation. Good technology makes the machine filters, cooling, and prevent shock and vibration, has been significantly improved. Structural design in the oil, hydraulic press at home and abroad tend to integrated, closed-end design, cartridge valves, stack valves and composite components and systems in the hydraulic system to be more widely used. Manifold can be specialized in particular the production, its quality, reliable performance and the design cycle is relatively short.

manifold in recent years, developed on the basis of the composition of a new hydraulic circuit components have their unique advantages, it does not require additional connectors of its more compact, relatively smaller size, weight, and more light pipe connection without the need to eliminate because of tubing, joints caused by leaks, vibration and noise. Logic Cartridge Valve is small, light weight, good sealing performance, the power loss is small, movement speed, ease of integration features, from the early 70s began to appear, so far has been very rapidly. China since 1970 on research and production of this valve, and has its wide used in metallurgy, forging equipment, showing a lot of advantages.

hydraulic technology widely used for bending, flanging, stretching, forming and cold extrusion processes such as stamping, press is a kind of static pressure to processed products. For pressing metal powder products, technology and non-metallic materials such as plastic, fiberglass, insulation materials and abrasive products pressing process, is also applicable to such correction, and press-fit technology.

the need for a variety of techniques, hydraulic machine has the following characteristics:

(1) table larger, longer slide stroke to meet the requirements of a variety of techniques;

(2) there is top of the device to the top of the workpiece;

(3) a bit of hydraulic equipment, manual and semi-automatic and other work, easy to operate;

(4) hydraulic press with a holding pressure, time delay and automatic return function, and can be set constant pressure molding and forming process of the operation, particularly suitable for metal powders and metallic powders to suppress;

(5) the work of the hydraulic machine pressure, pressing speed and travel range can be adjusted, flexibility.

two 150t hydraulic press hydraulic system

condition of the machine (see Figure 1.1) for the suppression of plastic materials technology. Such as punching, bending, flanging, such as sheet steel. Can also be engaged in the correction, press-fit, wheel forming, cold extrusion molding metal parts, plastic products and molding powder products. This machine has independent power and electric systems. Centralized control by the button, you can achieve adjustment, three kinds of manual and semi-automatic operation. Working pressure of the machine, pressing speed, load fast and slow down the travel range can be adjusted according to process needs, and to complete the general suppression process. This process is divided into constant pressure,Ugg new zealand,  given the two-way choice of process action. Constant pressure molding process action after the suppression of a packing, delay, auto-return, delay automatic return and other activities. This machine hosts a rectangular shape is novel and beautiful, dynamic system uses hydraulic system, the structure is simple, compact, sensitive and reliable. The machine also has foot switch, enabling semi-automatic process action cycle.