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 Isostatic press Million tons hydraulic press
Hydraulic equipment
Hydraulic press
Pneumatic machine
industrial automation
Hydraulic System
Hydraulic cylinder
hydraulic cylinders
Fixture cylinder
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Suzhou Xinhualong Hydraulic Pneumatic Equipment Co., Ltd.
Address:No.15, Wupu Road, Shengpu Town, Suzhou Industrial Park
Tel :0512-62853 607
Fax :0512-62853 046
Website: www.xhlyy.com
E-mail: info@xhlyy.com |
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Hydraulic machine maintenance and troubleshooting
1 Pump
Failure disposal
A discharge of an oil-free. Immediately stop turning in the wrong direction, the correct motor rotation direction, such as the rotation will be allowed to continue burning destruction causes.
(2) repair of the pump is not rotating coupling.
3 shaft broken, repair the pump rotor does not rotate, verify rotational speed, the pressure is within the specified above the axis is aligned..
4 Check the suction pipe clogged suction line.
5 of insufficient capacity fuel tank filter cleaning filter
6 The fuel tank capacity is insufficient filter by replacing a larger capacity, the pump capacity of more than 2 times.
7 Replace the oil's viscosity is too high oil types, set the heater.
8 less than a predetermined number of revolutions revolutions driven.
9 Check the suction pipe of the suction line airtight bad.
10 filters in the tank above the fuel oil to the baseline level gauge
11 from the rotor blades slide out bad repair pumps.
B murmur big one. Suction pipe is small, clogged suction vacuum should 200m mHg less.
2 tank filter is clogged Clean filter
3 Tank capacity is insufficient to use the filter more than two times the pump capacity of the filter.
4 Replace the oil's viscosity is too high oil types, set the heater.
5 In the double pump, suction pipe error oiling in the suction pipe, to identify and repair the bad place.
6 Check the intake air from the suction pipe axis is aligned.
7 air sucked by the pump seal at check return pipe configuration.
8 air bubbles inside the tank to the reference fuel oil, double pump can not use different tank.
9 The oil level is too low repair pumps.
10 vanes can slide out from the blade groove couplings damaged ones, the axis misregistration reassembled.
11 different sounds issuing postal couplings vent cleaning or replacement.
12 Fuel tank vent blocked or insufficient capacity checks revolutions.
13 exceeds a predetermined number of rotations after checking manometer.
14 more than the required pressure pump repair, make sure the axis is aligned.
15 bearing wear abnormal wear, the Department of dirty oil, oil mixed with water, the viscosity of the oil is not excessively high oil temperature in normal use.
16 re-assemble the pump cam ring wear to the correct torque wrench to tighten.
17 bad replacement pump pump cover tight.
18. Pump damage
C oil shortage 1 oil discharge reference in (A)
2 vacuum suction through the large, cavitation caused due to inhalation of air now (cavitation) Check suction oil filter oil indiscriminately, and configuration (as far as possible with a hose or straight pipe).
3 rotor cartridge wear, internal oil pump overhaul.
4 adverse to pump oil cap tight torque wrench to tighten properly.
5 Change the oil seed oil viscosity is too low, the installation of the cooler.
D ring 1. Replace damaged gasket seal
Office spill 2. Internal repair pump more oil, check the oil viscosity
2. Relief
A pressure is too high or too low a. Pressure setting improper re-do the correct settings.
2. Stress Disorder test gauge.
3 poppet valve seat surface is not properly before removing the poppet valve poppet valve reconstruction or exchange, remove the adjusting bolt from the outside with a guide rod poppet valve tap several times, there may be repaired.
4 Remove the cover balance piston check valve malfunction of the hole (orifice), whether there is dust and other debris blocked.
5 springs replace the spring force is too weak.
6 poppet valve seat, balance piston seat or seat wear dust cleaned or updated.
B Pressure unstable one. Balanced Piston check valve malfunction hole (orifice) whether there is dust, the valve action is smooth, and the spring state.
2 poppet instability will guide pin can be repaired most of the upper and lower pressure several times.
3 abnormal wear of the poppet valve poppet valve replacement, check the oil is dirty.
4 oil air exclude air.
5 Xiangjian poppet valve dirt (10), the hydraulic oil contamination.
C minor pressure oscillation (abnormal sound emitted when severe) 1. Abnormal wear of the poppet valve poppet valve replacement, check the hydraulic oil contamination.
(2) the air drain port exclude air.
3 Sees resonance with other control valve (6) items, resonance, vibration and noise.
4 tank piping adverse re-piping.
5 Replace high flow rate greater control valves.
6 outlet with back pressure balance piston type.
3 valve
Failure disposal
A pressure is too high or too low and (2) with the relief valve (2) with relief.
B Pressure unstable one. Spool valve malfunction of the central hole (orifice) blocked investigations row oil.
2 poppet valve insecure Sees (2) items overflow.
3 poppet valve abnormal wear Sees (2) Item relief valve.
4 oil mixed with air exclusion of air.
5 of discharge of oil changes and other back-pressure control valve of the discharge pipe separated, especially in the hydraulic control valve also should be noted.
4 flow control valve
A pressure correction device does not operate a. Spool decomposition with dust cleaning.
2 sleeve holes with dirt or overhaul.
3 small pressure difference between the oil entrances lowest 10kgf / c ㎡
B flow adjustment axis rotation tight one. Adjustment shaft exploded with dust cleaning.
(2) the amount of income used in the way, the secondary pressure is high pressure reduction after adjustment.
3 Kai flow points below the scale, reduce the pressure of high pressure after a rotation.
5 Direction Control
A valve stem by a human operator of an oil seal leak. Seal replace damaged seals.
(2) drain port back pressure back pressure must be 0.4kgf / c ㎡
B mechanical operation of the spool can not move one. Drain port back pressure above.
(2) The pressure valve angle is too large bump bump angle should be 30 degrees Celsius.
3. Pressure port and the exhaust port of the pipe piping bug fixes
C solenoid valve coil burning one. Replace the solenoid coil insulation failure.
(2) replace the solenoid magnetic coil core stuck ring core.
3 Check the voltage is too high or too low voltage appropriate adjustments.
4 Convert pressure lowering over the specified pressure, check the pressure gauge.
5 Conversion traffic regulations on the size of the control valve replacement flow.
6 backpressure low return oil interfaces used as 1.0kgf / c ㎡, high pressure is 7.0kgf / c ㎡ or less. Back to the oil port directly back to the tank, especially drain (using external drain).
D hydraulic control valve is not actuated 1. Insufficient hydraulic pilot pressure control control force 3.5kgf / c ㎡ or more, in the fully open or neutral oil return valve check valve should be installed so that the formation of
2 spool stalemate, decomposition cleanup, wash pilot pressure.
3 dust, decomposition cleanup, wash decomposition cleanup, wash
6 resonance, vibration and noise
A spring with spring resonance two or more sets of control valve spring resonance. (Such as a relief valve and the overflow would spring set pressure stagger, 10kgf / c ㎡ open more than 10%.
Flow valve, relief valve and sequence valve, relief valve and check valve). 2 change one spring sensitivity.
3 Use the remote control relief valve.
B spring and resonance control valve of the piping and piping spring resonance. (Such as a discharge line length. Changing the spring sensitivity.
Relief valve, pressure tubes and pipes provided the inner resonance). 2 pipe length, size, and quality changes. (Caught by hand, the tone will change).
3 Use the appropriate support to enable pipeline will not vibrate. (Hand caught, the sound will stop when the line).
C spring with the spring air resonance control valve and air resonance. (Such as relief valve, air valve port will be completely discharged oil.
Air, air valve port, etc.).
D air cylinder vibration due to vibration caused by hydraulic cylinders. The air discharge.
Especially when only one side into the oil seal ring must be fully oiled or coated with tallow-like copper sulfide.
E oil flow sound oil flow noise, fuel tank, pipeline vibrations. As
(1) Tank connection out of the oil pressure relief tank rushed sound. Replace the drain line.
(2) Adjust the valve interface with L-shaped fuel tank when the sound. Piping should be possible to use the hose.
(3) two pumps exercise near the confluence of the discharge side of the sound. Flow stability after it had just merged.
F tank resonance sound resonance tank 1 tank using thicker iron roof.
2 top and pumps, motors or rubber between then covered with iron.
3 pumps, motors not installed on the tank top and the other to be like skin tube connection.
G switching valve spool shaft acoustic sound of a switching valve. Reduced pilot pressure.
2 plus throttle
H pipe impact sound control valve transform, urgent bowel movements due to pressure caused by replacement of the piping issue impact sound control valves or piping, reduce the pressure of urgent bowel movements, use a special shaft plug. Such as open full of oil
Valve oil (oil pressure relief Decompression).
I check valve hammering sound check valve when the secondary-side backpressure sound of a hammer. Eliminate secondary side of the back pressure.
(2) improve pilot pressure.
3 Using external bleed the check valve (pilot check valve).
7. Flow shortage, insufficient pressure
1 pump does not drain Sees (1) Item A.
2 The pump draws air, inhaling high vacuum, the occurrence of cavitation Sees (1) Item C.
3 The pump's internal leak large Sees (1) Item B.
4 relief valve, pressure reducing valve's set pressure is too low Sees (2) Item A.
5 relief valve in the open state (the outer lead pilot port of the control valve is in the open state) on the outer guide of the pilot must be turned off when the pressure to rise.
6 After passage within control valves, hydraulic return to the tank. For example: open or neutral affect type and other valve in the neutral state, check the control valve of the trends.
7 control valves and hydraulic cylinders and other internal leakage 1 Check the drain each component separately.
8 control valves, hydraulic cylinders, hydraulic motors, piping, etc. externally drained 2 Check the oil's viscosity, the oil temperature.
9 of the set flow rate regulating valve in addition to the return line bad, all of the external leakage must be completely avoided.
10 Changes in the setting of the flow regulating valve shall be fully tightened.
11 of the flow regulating valve malfunction Xiangjian (4).
12 when the load is lighter than planned, or because of the use of continuous operation reduces the frictional resistance to reduce the setting of the pressure regulating valve (not due to a fault)
13 by the flow adjusting valve of the oil viscosity change with temperature compensated control valves.
8 hydraulic cylinders, hydraulic motors and other irregular movement
1 In the oil is mixed with air Sees (10) Item A.
Two piston seals and rod seals tight among the highest in the oil and set outside vent, the air completely ruled out.
3 piston seals and rod seals are not allowed in the slow movement of the center is more significant, it should reduce the amount of oil seal and tighten.
4 inside the cylinder is defective, and the inside diameter is fixed, due to dust may cause a stalemate in the no-load state of the friction resistance measuring cylinder, the center alignment.
5. Guide plate sliding surface too tight, jammed, remove the hydraulic cylinder poor lubrication itemized checks.
6 heavy load and slow movement forced lubrication, reducing the slide area.
7. Flow regulating valve due to wave action is not caused by accumulated dust Sees (4) items
8 pressure regulating valve, the flow regulating valve such resonance, a pulse current Xiangjian (6)
9 hydraulic cylinders and hydraulic motors reduce drain large spill, improving pump displacement.
10 The sequence valve and pressure relief valve setting of the relief valve setting similar increase to 10-15kgf / c ㎡ or 10% or more.
9 oil increased significantly
1 pressure regulating valve high pressure over the whole flow of the maximum operating pressure higher than necessary 10kgf / c ㎡ not be set too high.
Two high-pressure relief valve discharge capacity after checking unload oil.
3 low viscosity or pump failure caused by internal leakage through overhaul of the pump, replace the hydraulic oil.
4 tank of fuel shortage supplemental hydraulic oil, increasing the tank capacity, review the return line, the location of the filter, the device cooler, replacement bulkhead position.
10 Reasons hydraulic oil contamination and Their Disposal
A Air (air into the time in oil showed an opaque state, the hydraulic oil must always clear body shape)
1 matching pipe fittings (suction side and discharge side) in the pump operation, on pipes oiling to discover bad place.
(2) from the pump shaft seal replacement of seals.
3 of the cover side by the pump suction pressure washers are more easily if the intake air is low, so the suction pressure should be maintained above the 200m/mHg.
4 by the hydraulic cylinder piston rod seal for replacement of the seal.
5 by the hydraulic cylinder head gasket replacement washers.
6 airbags replaced by the energy storage device of the airbags.
7 each component (element) of all of the components required gasket sometimes soaked in oil below the surface, the installation of check valves.
8 of the oil tank to the oil level is too low oil level gauge above the baseline.
9 back to the tank above the oil level, the oil in the oil surface spray extension pipe to the oil below the surface.
10 There is no bulkhead, inhalation of air bubbles inside the tank to partition separating side and the suction side of the oil discharge that occurred bubbles float, will not be inhaled.
11 adverse hydraulic oil defoaming particularly good use of the hydraulic oil.
B water (water mixed in the oil when the oil is milky white, hydraulic oil must be kept clear shape)
1 from the tank through the hole in the higher moisture place, every month should put the oil from the oil discharge port to check the oil in the water, the oil is milky white when it must be replaced.
(2) The piping from the oil cooler cooler piping repairs.
3 In addition to the oil tank cover tank outside vent must be airtight.
C Solid
1 in the assembly of chips, etc. Rinse thoroughly implemented.
(2) when the seal piping installation method Note the oil seal.
3 In addition to the fuel tank cap fuel tank vent outside shall be gastight.
4 from the tank's vent (filler) vent (filler) install iron velvet.
5 pumps and control valves and other devices magnetic plug abrasion force (magnetic plug).
6 of the inner surface of the fuel tank hydraulic oil resistant paint used for painting.
D rubber adhesive material
1 washer classes were dissolved using hydraulic oil resistant hydraulic splash of washers, the airbag accumulator to pay attention.
2 tank of paint Sees (C) items.
3 Piping the oil seal above.
4 The worst of the oil should be controlled oil temperature below 60 ℃, Sees (9) items.
Good antioxidant activity using hydraulic oil.
11 solenoid valve
A malfunction. Because of slipping due to poor spring axis can not be restored to its original position replace the spring
2 spool of a malfunction and slow movements. Washed to remove the oil control valve inside the mixing thereof.
(2) Check the filter, if necessary, wash or replace the hydraulic oil filter.
3 Check the wear slip-axis case, when necessary, replace it.
3 Tighten the bolt or excessive body deformation due to temperature rises to loosen and tighten bolts degree (diagonal interaction tighten)
4 spool of abnormal wear check into the terminal contact state, confirm the action solenoid is normal, if the coil is required for break or burn it.
An internal leak. Mouth seal ring injury replacement.
Big oil
External leakage 2. Bolts loose and then tighten.
Oil
Magnetic field lines 1 load voltage error checking voltage, use the appropriate solenoid.
Noise ring 2. Dust and other impurities enter remove impurities.
And burning 3. Electromagnetic coil damage, burning replacement.
4 spool replacement of abnormal wear.
Proper oil temperature gauge Oil temperature diagram
100 ℃
80 ℃
Dangerous temperature must not be used
65 ℃ temperature gauge shorten the life of all hydraulic oil, use an oil cooler, oil temperature over 60 ℃, every rise 8 ℃, its life will be sequential halved.
Note that the temperature 55 ℃
Safety temperature 45 ℃ most appropriate temperature, highest performance, longest life.
30 ℃ ideal temperature
20 ℃ ambient temperature when starting without danger, but the long-running inefficient.
0 ℃ cold start should be noted that the low temperature of the working oil viscosity is high, easy to cause cavitation.
Temperatures above written back to the oil side of the oil temperature measurement system
Hydraulic cylinder common formulas
Hydraulic oil maintenance management measures
1 used at temperatures below 70 ℃, if possible, preferably below 60 ℃, especially in the case of high-pressure relief valve back into the working oil from the high degree of local heating by a heater or other required great attention, due to high temperatures will accelerate the oxidation.
2 To control pollution, contamination of oil due to work sometimes becomes the catalyst material, accelerated oxidation.
3 Avoid working oil mixed with water, the water will work due to deterioration of the oil, too much water will work when the oil emulsion.
4 different manufacturers of the working oil can not be mixed, as well as with vendors manufacture, but the name and a different level of work required to avoid mixing oil. Because the oil will cause degradation of the additives.
5 To control the hydraulic machinery and piping oil spills, the amount of leakage to a minimum.
6 working oil periodic inspections.
※ deterioration has already begun working oil, added new oil does not prolong life, it should be all the new ones.
Hydraulic machine periodically check essentials
Check the site inspection items checked during inspection methods
Oil tank leak oil every week visually
(Including working oil) oil leak visually every week
Pump oil cleanliness and character dependency analysis three months
Oil temperature and oil temperature gauge or touch every week
Three months displacement drive speed measurement test station
Noise months manometer
Surface temperature of the sense of hearing or noise meter three months
Seal, seals, leak or visually inspect the fuel tank three bubbles, noise
Oil or inhalation of air
Couplings oil supply, degree of wear visually year
Pressure control valve settings and the operation state of three gauge or the operation status of the actuator
Flow control valve settings and operation status three drive speed measurement
Directional control valve action status three drives an operation check
Internal leakage of the year immediately actuator action or determination of the test station
500MV coil insulation resistance was measured with a year
Filter cleanliness visually month
Cleanliness three months of washing
Cooling capacity of the cooler months oil dollars or touch
Drain water three reference values of the working oil analysis
Drain pipe and pipe clamps visual oil every week
(Including rubber oil) vibrational relaxation weekly visual, tactile or vibration meter
Rotary hydraulic cylinder operating time operating time was measured every week
Shock and vibration weekly visual, tactile or vibration meter
Drain the oil weekly visual
Chucks oil supplies lubricating oil into the daily work in the morning immediately
Cleaning every six months all of decomposition, cleaning
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