2012年9月9日星期日

Hydraulic equipment installation debugging


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(A) Jog: Jog pump, observe the oil pump rotation is correct, power, anti-oil output and sometimes also likely to have an accident, so remember when operation starts only "jog". Get ready for continuous operation when the pump sound normal and continuous output of oil and other irregularities, and no-load debugging.

(B) no-load debugging: the first l0 20 minutes at low speed, is sometimes necessary to remove the motor and the load of the fuel tank or oil connection. Especially during the cold season, with no load at low speed (warming up) is particularly important, some imported equipment often have strict requirements, some equipped with a heater tank fluid warming. The first trial run be able to run in the low-speed low-voltage action.hydraulic hose fitting

(C) uniform gradually boost acceleration, the specific method of operation is repeatedly tighten and immediately loosen the relief valve, pressure or flow rate of the flow valve to adjust the handle a few times, and pressure gauge observed pressure lifting speed changes and actuators changes in conditions such as heat, vibration and noise of the pump. Found the problem to analyze and solve.

(D) the debug single action combined with electrical machinery in accordance with the action cycle table first, and then transferred to the cycle of action debugging, check each action whether coordination. Generally will be in the process of debugging some problems, such as crawling, impact, and no change to other faults of complex domestic and imported equipment, if there is a difficult problem to solve, can be common consultation, if necessary, resort to hydraulic equipment manufacturers.hydraulic hose assemblies

(E) Finally, enter the full load debugging, the maximum working pressure and the maximum (minimum) speed test the technical performance of hydraulic equipment, check the power, heat, noise and vibration, high-speed impact, low-speed crawling. Check the various parts of the oil spill, the often-load does not leak site increased pressure Shique oil spill. Found the problem immediately removed, and make a written record.

If everything is normal, trial processing specimens. Commissioning is completed, after stopping machine generally want to recover and make a detailed debug log file. Some imported equipment debug log can be used as the basis for the claim.hydraulic ferrule

(F) by applying the above debugging good handle of the hydraulic equipment, and generally do not move. Handwheel on the upcoming packaging factory equipment should release all. Long-term without the equipment, should be the handwheel release the pressure valve to prevent the spring permanent deformation affects the mechanical equipment enabled various types of failures affect performance.

 

 

 

Common failure of the hydraulic valve stem down failure


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The the stem down failure reasons: â'  The operation excessive thread damage; â'¡ lack of lubrication or lubricant failure; â'¢ stem bending and torsion; â'£ surface finish is not enough; â'¤ fit tolerances are not allowed to bite too tight; â'¥ stem nut tilt; improper â'¦ material selection, such as stem and stem nut is made of the same material, easy to bite; the â'§ thread is corrosive medium (dark bar valve stem nut in the lower part of the valve); â'¨ lack of protection of open-air valve stem thread covered with dust and sand or rain frost and snow are corroded.
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Prevention methods:
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(1) careful operation, when closed, do not make Meng Jin, open to the top dead center, do not open enough will handwheel rewind twice, so that the thread on the side of the adhesion, to avoid media to promote stem upward impact; (2) regular checks of lubrication, maintaining normal lubrication; â'¢ Do not use a long lever opening and closing valves, accustomed to using a short lever workers forced to strictly control the sense of proportion, to prevent bending and stem (hand wheel and stem directly connected to the valve); â'£ improve processing or repair quality, meet regulatory requirements; â'¤ materials to corrosion, to adapt to the working temperature and other working conditions; the â'¥ stem nuts not to use the same material with the stem; â'¦ plastic for stem nut to checking the strength to not only consider good corrosion resistance and low coefficient of friction, must also consider the intensity of the problem, the strength is not enough, do not use; â'§ open-ai r valve stem protection sleeve to add; the â'¨ normally open valve, want to turn the hand wheel on a regular basis, so as not to stem rust live.hydraulic fittings suppliers

Other problems common to hydraulic valves


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Gasket leak: the main reason is impatience corrosion, not suited to working temperature and pressure;, high temperature valve temperature changes. Prevention: adapt to the working conditions of the washer, want to check on the new valve gasket material suitability should be replaced if not suitable. High temperature valve to use tight again bolts.
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Body cracking result: generally frozen. When it s cold, the valves should have insulation and heating measures, otherwise discontinued after should the valve and connecting pipe in the water to drain clean (if there is a valve at the end plugs, open wire blocking drainage).
 

The hand wheel damage: due to the impact or long lever violently operation. As long as the operator and other relevant personnel, could have been avoided.
 

Packing gland rupture: compression packing uneven force, or gland (usually cast iron) defective. Compression packing, rotary screw symmetry to not skew. Manufacture not only pay attention to the large and critical pieces, should also pay attention to the elements of the gland such times, otherwise the impact of the use.bsp connector
 

Stem and the valve plate connection failure: gate valve stem rectangular head with ram T-slot connection in the form of more T-shaped groove sometimes not processing, so that the stem rectangular head wear faster. Mainly from manufacturing to solve. But the use of units of the T-shaped slot complement processing it finish.hydraulic fittings suppliers
 

Gate valve gate can not be pressed tightly cover: double plate tension * top wedge, some poor valve, top wedge material (low-grade cast iron), using the soon worn or broken. The top wedge small pieces, not many of the materials used, using the unit can produce its own carbon steel, replaced the original iron castings.

 

 


China hydraulic seals market future


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    This year, relatively fast development of China s agriculture, water conservancy, energy, transportation and other industries to do this requires a lot of machinery and equipment to meet their development needs. With industri alization and the improvement of the level of automation, the equipment supporting a large number of high performance and high reliability of hydraulic pneumatic and sealing elements. Preliminary estimates, in 2010 the total demand for hydraulic, hydraulic, pneumatic and sealing products will increase from 200 million in 2005 to about 350 billion. , Hydraulic products from more than 100 billion yuan to 200 billion yuan, hydraulic products from 10 billion to $ 20 billion, pneumatic products from nearly 30 million to more than 50 billion yuan, sealing products from more than 30 million to $ 70 billion.hydraulic hose fitting

Construction machinery are the biggest users of hydraulic products, total industry sales of 42.3, the proportion will increase in the future. It is expected that the demand for hydraulic excavators in 2010 about $ 60000 80k too, loaders about 10 million -12 million units, the grader about 2,000 units, a roller about 1.5 million units, engineering cranes about 20,000 units, Forklift about 8 million units. In addition, China now has about 140 million units of construction machinery, is expected to reach 200 million units in 2010.hydraulic hose assemblies

Imported annually for the domestic production of excavators, road machinery, cement mixers and other supporting hydraulic parts, about $ 150 million or more. In short, for the construction machinery, maintenance of hydraulic and seals the market will face a new period of development.hydraulic ferrule
 


Brief description of the steps of the installation of the valve components during the assembly of hydraulic equipment


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Installation steps are as follows:

(A) The installation, first with clean kerosene or the diesel (hanged gasoline) cleaning the the element surface rust and other contaminants, careful not to unplug the plug plastic plug in the oil port, in order to avoid dirt from entering the valve within.skiving machine

(B) to design and manufacture of special valves according to relevant standards such as the performance test, pressure test, and so on.

(C) the installation of the plate valve components to check the oil seals port for missing or off, whether projecting mounting plane compression margin are the same variety of seals on the same plane as the amount of protrusion whether to install the O-ring groove of the oil port strain, whether mounting surface bumps made the disposal after assembly. O-ring coated with a little butter to prevent shedding.

(D) plate valve mounting screws (more than four) competing for times you want to tighten evenly. Not a single screw to tighten this will cause distortion of body and seal compression margin inconsistencies caused by oil spills and out of the seal on the floor.bsp connector

(E) out of the oil port symmetrical valve easy access to the oil port installed anti lookalike pressure valves, the installation should pay particular attention to the distinction between so as not to install the wrong.

(F) of the tubular valve, in order to install and easy to use, and often the two intake ports or two back to the oil port, install the ports will not be blocked with plug or other processing, in order to avoid the spray operation oil or malfunction.hydraulic fittings suppliers

(G) solenoid valve should generally horizontal installation, re-direct installation (two valves) the electromagnet general upward and this factor should be considered in the design of the mounting plate.

(H) relief valve (pilot) has a remote port blocked (tube) or mounting plate (plate) drilled through application plug when not using the remote control.

 

Descriptions accessories hydraulic equipment assembly installation steps


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  Auxiliary hydraulic system components, including the installation of the pipe and fittings, oil filter, oil cooler, seal, accumulator and instrumentation, etc. is good or bad can also seriously affect the normal operation of the hydraulic system does not allow the slightest negligence.

Design, it is necessary to consider the correct position of these auxiliary components configuration. Try to consider the use, ease of maintenance and adjustments, and pay attention to the neat appearance. The following highlights the installation of the tubing.hydraulic hose fitting

Piping installation quality impact to the oil spill, leak, vibration and noise, as well as the size of the pressure loss, and thus will have a variety of fault. The installation of the pipeline should be aware of the following:

(A) tubing length to fit. Construction gestures with wire bent into a desired shape, and then show decided to flowline length straight. Completely design often length may not be very accurate.

(B) satisfy the connection premise, the pipeline is as short as possible, avoid sharp turn, the corner positions as possible, in order to reduce the pressure loss.

(C) parallel and cross pipe spacing, at least 10mm to prevent mutual interference and vibration caused by the pipeline each other percussion grazing.hydraulic hose assemblies

(D) the tubing can be cold-formed (brass), bending (steel pipe) can also be used. Hot curved Bi tube pipe within the oxide should be removed.

(E) The suction pipe should be short, should be thicker, the the general suction nozzle are equipped with oil filter, oil filter must be at least in the oil below 200mm. Piston pump inlet pipe recommended nozzle mounted oil filter mouth, cut into the nozzle at a 45 ° bevel, helical faces toward the walls of the box, and so increase the flow area to reduce the flow rate and to prevent impurities from inhalation of oil pump.

(6) hydraulic system return pipe as far as possible away from the suction tube should be inserted under the oil tank, prevents back oil splash bubbles and quickly sucked into the pump. Return pipe nozzle should be cut to 45. Slant to expand the flow area to improve the flow of oil return status and prevent air anti-irrigation into the system.hydraulic ferrule

(G) relief valve oil return to the hot oil, should be kept away from the suction pipe, it can avoid the hot oil without cooling by pump suction system, causing the temperature rise.

 

 

Brief hydraulic cylinder installation steps


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(A) The installation of the hydraulic cylinder, to do a special protective cover seals, and the oil inlet and outlet and put the material filled with a special air intake, to ensure that the piston into the cylinder seals will not cut bad.

(B) To check the piston rod is bent, especially on long stroke cylinder. Piston rod bending will cause damage to the cylinder head sealing, leak, reptiles and fail to operate. And exacerbated partial wear of the piston rod. skiving machine

(C) of the hydraulic cylinder axis parallel with the rail. Particular attention to the situation when the piston rod fully extended. If they are not parallel, will have a greater lateral force, causing the fuel tank stuck commutation bad, reptiles and cylinder seal broken, such as the failure of failure. General rail basis, to adjust the hydraulic cylinder with a dial indicator. The piston rod side bus (extended) parallel to the V-shaped guide rail, bus bar, flat rails parallel tolerance is 0. 04 ~ 0.08mm / m.bsp connector

(D) of the installed base of the axis of the piston rod on both ends of the bearing surface, parallel error not greater than 0.05mm.hydraulic fittings suppliers

(E) the trip is longer hydraulic cylinders, piston rod and table join should remain floating (spherical pair connected), impact stuck to compensate for installation errors and compensation for thermal expansion.