A complete hydraulic system consists of five parts, namely, power components, actuators, control components, auxiliary components (accessories) and hydraulic oil. The purpose of the power element is to convert the mechanical energy of the prime mover into the pressure energy of the fluid, referring to the oil pump in the hydraulic system, which powers the entire hydraulic system. The structure of the hydraulic pump are generally gear pump, vane pump and piston pump. Actuators (such as hydraulic cylinders and hydraulic motors) have the effect of converting the pressure of the fluid into mechanical energy that drives the load for linear reciprocating motion or slewing motion. Control elements (ie, various hydraulic valves) control and regulate the pressure, flow and direction of the fluid in the hydraulic system. According to the different control functions, hydraulic valves can be divided into pressure control valve, flow control valve and direction control valve. Pressure control valve is divided into the benefits of flow valve (safety valve), pressure relief valve, sequence valve, pressure relay, etc .; flow control valve, including throttle, regulating valve, shunt manifold valve; directional control valve including one- Hydraulic check valve, shuttle valve, reversing valve. According to different control methods, hydraulic valves can be divided into the switch-type control valve, the value of the control valve and proportional control valve. Auxiliary components, including fuel tanks, oil filters, tubing and fittings, seals, quick change connector, high pressure ball valve, hose assembly, pressure fittings, pressure gauges, oil level oil temperature meter. Hydraulic fluid is the hydraulic system in the transmission of energy working medium, a variety of mineral oil, emulsion and synthetic hydraulic oil and other categories. Hydraulic system structure Hydraulic system consists of signal control and hydraulic power of two parts, the signal control part is used to drive the hydraulic power part of the control valve action. Hydraulic power part of the circuit diagram that way to indicate the relationship between different functional components. The hydraulic source contains a hydraulic pump, a motor and a hydraulic auxiliary element; the hydraulic control part contains various control valves for controlling the flow, pressure and direction of the working fluid; the executive part contains a hydraulic cylinder or a hydraulic motor, select. In the analysis and design of practical tasks, the general use of the block diagram shows the actual operation of the equipment. Hollow arrows indicate signal flow, while solid arrows indicate energy flow. Sequence of actions in the basic hydraulic circuit - Commutation and spring return of the control element (two-position, four-way valve), extension and retraction of the actuator (double acting hydraulic cylinder) and opening and closing of the relief valve. For actuators and controls, presentations are based on the corresponding circuit diagram symbols, which are also prepared to introduce the circuit diagram symbols. Depending on how the system works, you can number all loops sequentially. If the first actuator number is 0, the control element identifier associated with it is 1. If the component identifier corresponding to the actuator overhang is an even number, the component identifier corresponding to the actuator retraction is an odd number. The hydraulic circuit should be numbered not only, but also the actual equipment number to find the system fault. The DIN ISO1219-2 standard defines the numbering of an element, which consists of the following four parts: the device number, the loop number, the element identifier and the element number. If the entire system has only one device, you can omit the device number. In fact, another numbering method is to continuously number all the components in the hydraulic system. In this case, the component number should be consistent with that in the component list. This method is particularly suitable for complex hydraulic control systems, each of which corresponds to its system number. Hydraulic system maintenance A hydraulic system is not only good or bad depends on the system design and system components of the merits of the merits, but also because of the system of pollution prevention and treatment, the system of pollution directly affects the reliability of the hydraulic system and components Service life, according to statistics, about 70% of hydraulic system failures at home and abroad are caused by pollution. Oil pollution on the system are mainly as follows: 1) pollution of components Pollution in the oil caused by various pollutants in various forms of wear and tear, solid particles into the movement of Vice clearance, cutting or wear and tear on the part surface wear and tear. The impact of solid particles in the high-speed fluid on the surface of the component causes erosion wear. The oxidation of water and oil in the oil produces a corrosive effect on the element. In addition, the air in the system oil causes cavitation, causing the surface of the component to erode and break. 2) The components of the blockage and clamping failure Solid particles plug the hydraulic valve clearance and orifice, causing the spool plug and jamming, affecting performance, and even lead to serious accidents. 3) to accelerate the deterioration of oil performance Oil and water in the oil with its thermal energy is the main condition of oil oxidation, and oil in the metal particles play an important catalytic oxidation of oil, in addition, the water in the oil And suspended bubbles significantly reduce the strength of the oil film between the movement, so that lubrication performance decreases. First, the type of pollutants Pollutants in the hydraulic system of oil is hazardous to the system of the material, it exists in the oil in different forms, according to their physical form can be divided into: solid pollutants, liquid pollutants, Gaseous pollutant Solid contaminants can be classified as hard contaminants: diamond, cutting, silicon sand, dust, wear metals and metal oxides; soft contaminants are: additives, water condensates, decomposition products of oil and polymers and repairs Into the cotton, fiber. Liquid contaminants are often not suitable for the system slotting oil, water, paint and chlorine and its halides, etc., usually we find it difficult to remove, so choose the hydraulic oil to meet the system standard hydraulic oil, to avoid unnecessary failure. Gaseous contaminants are primarily air entrapped in the system. These particles are often so small that they can not settle and float in the oil and are eventually pushed into the gaps between the various valves. For a reliable hydraulic system, the pair of gaps is controlled to a limited extent, Importance and accuracy are paramount. Second, the source of pollutants: The source of pollutants in the system oil mainly in the following ways: 1) external invasion of pollutants: external invasion of pollutants mainly in the atmosphere of gravel or dust, usually through the fuel tank pores, cylinder Seal shaft, pump and motor isometric intrusion system. Mainly the impact of the use of the environment. 2) internal pollutants: components in the processing, assembly, commissioning, packaging, storage, transportation and installation of residual contaminants in the process, of course, these processes can not be avoided, but can be reduced to a minimum, some special components in the assembly and Commissioning need to be clean room or clean bench environment. 3) The hydraulic system produces contaminants: the system during operation due to wear and tear of the components of the particles, the castings off the sand, pumps, valves and joints off the metal particles, pipe rust peel off its oil Liquid oxidation and decomposition of the resulting particles and jelly, even more serious is the system before the pipeline is put into operation without washing a lot of impurities. Hydraulic system maintenance A system is generally washed before it is put into service. The purpose of flushing is to remove contaminants, metal shavings, fiber compounds, iron core and the like remaining in the system during the first two hours of operation, even if not completely destroyed System, can also cause a series of failures. Therefore, the following steps should be taken to clean the system oil: 1) Clean the tank with a clean dry solvent and remove the solvent residue with filtered air. 2) Clean all piping of the system, in some cases the piping and fittings need to be impregnated. 3) Install oil filter in the pipeline to protect the valve oil supply pipeline and pressure pipeline. 4) Install a flush plate on the collector to replace the precision valve, such as electro-hydraulic servo valve. 5) Check all pipe size is appropriate, the connection is correct. If the system used to electro-hydraulic servo valve, I may wish to say a few words, servo valve to wash the plate to make the oil flow from the supply pipe to the collector, and return directly to the tank
Roller Brush :
Paint Roller Brush , also known as drum, cent is long hair, the hair, short on kinds, is a kind of tool for large area coating roller coating.
In the daily interior decoration project, when brushing the paint or the coating, will often use to the fine Wool Roller Brush , belongs to the most common paint tool
different roller brush besmear to brush out different effects, long hair roller besmear to brush out some fine texture and AoTuGan, similar to the skin texture effect. After hair roller besmear brushs paint is uniform, smooth, no AoTuGan, MAO in somewhere in between.
Use roller brush brush wipe as long as the flat can, if want to daub evenly, drum (preferably in the paint bucket to absorb them, then take out on the inclined plane rolling a few times, press the excess paint started to paint the walls again.
Fine wool rolling brush is also called fine wool roller brush or short hair roller. The Paint Tray using collocation effect is more ideal, because the rolling brush width, rotation speed, is the most labor-saving and time-saving brushing tools, especially the extended rod, can easily paint the walls or roof height.
Roller brush making
Fine brush is a piece of cloth (short hair, thin, dense) stuck in a tube, and then loaded with holes in the pipe ends the hijab, thus form a set of hair, with a reinforced (5-8MM) bent into Figure 7. The upper end is inserted into the fleece, the lower end of the handle and, a rolling brush made of this kind of.
Usage method
The whole set of hair in paint or paint, look at the consistency of decision of soaking time, let the hair set suck enough paint or paint, draw some mention of W shape on the surface of an object, let the excess draw on the surface of an object, then the order from left to right to scroll up and down, this effect is obvious. When finished, please clean it in time and dry it for next use.
Note;
The use of brush brush can be as long as straight, if you want to brush evenly, best to let it fully absorbed in into the paint bucket, and then come up with a few rolling on slope, extrude the extra paint and whitewashing. For brushing the edge of the corner or gap, and then better equipped with mini drum or wool brush to use, so that the effect is more perfect
Roller Brush
Roller Brush,Paint Roller Brush,Mini Roller Brush,Ceiling Paint Roller Brush
Zhenjiang Runyang Brush Industrial Co. Ltd. ,