1. The noise of the oil pump is too loud (heating too fast) and the oil pump is damaged
1). The oil pump is absorbed by the oil pump suction pipe or the oil tank is too low;
2). The oil temperature is too low, the oil viscosity is too big, which causes the oil absorption resistance;
3). The oil filter is blocked and the oil is dirty;
4). Pump damage (pump installation injury) by any beat;
5). The installation of the coupling, such as axial tight, the motor shaft and the axis of the pump will not be on the line;
6). The duration of the test after the pump installation is reversed or not refueling;
7). The high pressure filter is blocked or the flow is not up to standard;
8). Oil pump suction (there is oil, but there is air at the oil pump suction mouth);
9). If it is a plunger pump, it may be that the height of the return oil outlet line is too low;
10). If it's HOEBIGER oil pump, then it might be gas;
11). The oil temperature is too high, results in the decrease of viscosity (60 ° C);
12). Hydraulic oil contains water, which can cause the high pressure filter core to plug and damage;
2). The oil temperature is too low, the oil viscosity is too big, which causes the oil absorption resistance;
3). The oil filter is blocked and the oil is dirty;
4). Pump damage (pump installation injury) by any beat;
5). The installation of the coupling, such as axial tight, the motor shaft and the axis of the pump will not be on the line;
6). The duration of the test after the pump installation is reversed or not refueling;
7). The high pressure filter is blocked or the flow is not up to standard;
8). Oil pump suction (there is oil, but there is air at the oil pump suction mouth);
9). If it is a plunger pump, it may be that the height of the return oil outlet line is too low;
10). If it's HOEBIGER oil pump, then it might be gas;
11). The oil temperature is too high, results in the decrease of viscosity (60 ° C);
12). Hydraulic oil contains water, which can cause the high pressure filter core to plug and damage;
2. No pressure or pressure on the system can not build up
1). The oil pump turns into mistake or the oil pump is damaged;
2). Whether the pressure gauge is damaged;
3). There is no electrical signal or plug for the pressure control valve;
4). The pressure plug valve is blocked, the card cannot be sealed;
5). Filling valve (no slow down);
6). The compensation amplifier is too small;
7). Pressure can only reach a certain value, using a direct method of 24V to determine whether the valve oil pump has a problem;
2). Whether the pressure gauge is damaged;
3). There is no electrical signal or plug for the pressure control valve;
4). The pressure plug valve is blocked, the card cannot be sealed;
5). Filling valve (no slow down);
6). The compensation amplifier is too small;
7). Pressure can only reach a certain value, using a direct method of 24V to determine whether the valve oil pump has a problem;
3. Slow pressure construction (REXROTH hydraulic system)
1). The damper hole at pressure valve X is likely to be blocked;
2). The valve in the pressure valve may not be flexible;
3). Possible problems in electrical engineering: test the voltage of the electromagnetic pressure valve 24V directly, or use something to test the core of the electromagnetic pressure valve;
4). The high pressure filter is blocked;
2). The valve in the pressure valve may not be flexible;
3). Possible problems in electrical engineering: test the voltage of the electromagnetic pressure valve 24V directly, or use something to test the core of the electromagnetic pressure valve;
4). The high pressure filter is blocked;
4. There will be a crash when it is fast
1). The impact sound caused by the looseness of guide plate;
2). The position of the grating ruler is incorrect;
3). The setting value of the delay parameter is too small;
2). The position of the grating ruler is incorrect;
3). The setting value of the delay parameter is too small;
5. The slider does not move quickly
1). Check the valve for electrical signals or jam;
2). There is no electrical signal or the valve core of the electromagnetic proportional transfer valve, and it is stuck (check the feedback voltage);
3). The mechanical part is too tight, such as the guide rail plate is too tight, the oil cylinder is too tight;
4). The filling valve is closed and cannot be opened to absorb oil;
5). The problem of raster ruler;
6). Whether the foot switch is in good condition, check the wiring;
7). Slow down the valve and turn off the filling valve. No oil can be found in the upper chamber;
2). There is no electrical signal or the valve core of the electromagnetic proportional transfer valve, and it is stuck (check the feedback voltage);
3). The mechanical part is too tight, such as the guide rail plate is too tight, the oil cylinder is too tight;
4). The filling valve is closed and cannot be opened to absorb oil;
5). The problem of raster ruler;
6). Whether the foot switch is in good condition, check the wiring;
7). Slow down the valve and turn off the filling valve. No oil can be found in the upper chamber;
6. The speed of sliding block has a long pause
1). Suction air from the oil cylinder, and the pressure builds up the required length (the leakage from the straw road);
2). The filling valve or the flow of the suction pipe is small, or the sliding block is too fast and the suction vacuum is caused;
3). The liquid-filled valve is not closed completely and the slider speed is too fast to cause suction vacuum;
4). Slow down the valve and turn off the filling valve. No oil can be found in the upper chamber;
5). The position of the proportional valve does not cause the opening to be different, and it is not synchronized;
6). There is no pause in reducing the speed of the test;
7). The size of the pressure is affected by the closing of the filling valve;
8). Adjustment of pressure parameters during pre-advance delay stage;
9). The control pipeline damper hole is too small and the pressure differential is formed;
10). Numerical control system parameters (delay before slow down);
11). Numerical control system parameters (decrease of lower gain parameters);
2). The filling valve or the flow of the suction pipe is small, or the sliding block is too fast and the suction vacuum is caused;
3). The liquid-filled valve is not closed completely and the slider speed is too fast to cause suction vacuum;
4). Slow down the valve and turn off the filling valve. No oil can be found in the upper chamber;
5). The position of the proportional valve does not cause the opening to be different, and it is not synchronized;
6). There is no pause in reducing the speed of the test;
7). The size of the pressure is affected by the closing of the filling valve;
8). Adjustment of pressure parameters during pre-advance delay stage;
9). The control pipeline damper hole is too small and the pressure differential is formed;
10). Numerical control system parameters (delay before slow down);
11). Numerical control system parameters (decrease of lower gain parameters);
7. No slow motion of sliding block
1). There is no electrical signal or no movement of the electromagnetic proportional change valve;
2). The system cannot build pressure;
3). The filling valve is stuck, or the filling valve sealing ring leaks;
4). Slow down valve with or without electric signal or jam;
5). The back pressure is too high or the pressure is too low;
2). The system cannot build pressure;
3). The filling valve is stuck, or the filling valve sealing ring leaks;
4). Slow down valve with or without electric signal or jam;
5). The back pressure is too high or the pressure is too low;
8. When the slider slows down, it vibrates, wiggles, and makes noise
1). Air bubbles are contained when oil cylinders discharge pressure oil;
2). The friction of sliding block guide rail is too high and there is no lubricating oil;
3). Large gap between the guide plate, or up and down;
4). The rack and table level have not been adjusted;
5). The balance valve is blocked;
6). Check to see if the valve is energized
7). Numerical control system parameters (gain), or the working speed setting is too large
8). The back pressure valve is loose, the two sides have different resistance
9). The electromagnetic proportional valve coil has unbiased, proportional valve position signal is correct
10). Whether the signal of proportional servo valve is disturbed, its check method is the same
11). Oil cylinder sealing ring shall hold the piston rod to death, and the resistance is large (the test of polytetrafluoroethylene hard sealing ring)
12). The ball gasket on the grating ruler is not installed, the slider movement is not smooth and the grating ruler communication line has problems
13). The pressure curve is not correct, and the pressure is not enough
14). Pressure sealed o-ring for the filling valve to produce a small amount of leakage
2). The friction of sliding block guide rail is too high and there is no lubricating oil;
3). Large gap between the guide plate, or up and down;
4). The rack and table level have not been adjusted;
5). The balance valve is blocked;
6). Check to see if the valve is energized
7). Numerical control system parameters (gain), or the working speed setting is too large
8). The back pressure valve is loose, the two sides have different resistance
9). The electromagnetic proportional valve coil has unbiased, proportional valve position signal is correct
10). Whether the signal of proportional servo valve is disturbed, its check method is the same
11). Oil cylinder sealing ring shall hold the piston rod to death, and the resistance is large (the test of polytetrafluoroethylene hard sealing ring)
12). The ball gasket on the grating ruler is not installed, the slider movement is not smooth and the grating ruler communication line has problems
13). The pressure curve is not correct, and the pressure is not enough
14). Pressure sealed o-ring for the filling valve to produce a small amount of leakage
9. When slow down, the deviation is large
1). Failure of synchronous detection system (raster ruler)
2). Proportional directional directional control valve
3). Close valve leakage
2). Proportional directional directional control valve
3). Close valve leakage
10. No slow motion of sliding block
1). There is no electrical signal or no movement of the electromagnetic proportional change valve
2). The system cannot build pressure
3). The filling valve is stuck, or the filling valve sealing ring leaks
4). Slow down valve with or without electric signal or jam
5). The back pressure is too high or the pressure is too low
2). The system cannot build pressure
3). The filling valve is stuck, or the filling valve sealing ring leaks
4). Slow down valve with or without electric signal or jam
5). The back pressure is too high or the pressure is too low
11. When the slider slows down, it vibrates, wiggles, and makes noise
1). Air bubbles are contained when oil cylinders discharge pressure oil
2). The friction of sliding block guide rail is too high and there is no lubricating oil
3). Large gap between the guide plate, or up and down
4). The rack and table level have not been adjusted
5). The balance valve is blocked
6). Check to see if the valve is energized
7). Numerical control system parameters (gain), or the working speed setting is too large
8). The back pressure valve is loose, the two sides have different resistance
9). The electromagnetic proportional valve coil has unbiased, proportional valve position signal is correct
10). Whether the signal of proportional servo valve is disturbed, its check method is the same
11). Oil cylinder sealing ring shall hold the piston rod to death, and the resistance is large (the test of polytetrafluoroethylene hard sealing ring)
12). The ball gasket on the grating ruler is not installed, the slider movement is not smooth and the grating ruler communication line has problems
13). The pressure curve is not correct, and the pressure is not enough
14). Pressure sealed o-ring for the filling valve to produce a small amount of leakage
2). The friction of sliding block guide rail is too high and there is no lubricating oil
3). Large gap between the guide plate, or up and down
4). The rack and table level have not been adjusted
5). The balance valve is blocked
6). Check to see if the valve is energized
7). Numerical control system parameters (gain), or the working speed setting is too large
8). The back pressure valve is loose, the two sides have different resistance
9). The electromagnetic proportional valve coil has unbiased, proportional valve position signal is correct
10). Whether the signal of proportional servo valve is disturbed, its check method is the same
11). Oil cylinder sealing ring shall hold the piston rod to death, and the resistance is large (the test of polytetrafluoroethylene hard sealing ring)
12). The ball gasket on the grating ruler is not installed, the slider movement is not smooth and the grating ruler communication line has problems
13). The pressure curve is not correct, and the pressure is not enough
14). Pressure sealed o-ring for the filling valve to produce a small amount of leakage
12. The synchronous deviation is large when slow down
1). Synchronous detection system failure (raster ruler)
2). Proportional directional directional control valve
3). Close valve leakage
4). The pressure difference between the two sides is large
5). Low oil temperature
6). Oil cylinder upper chamber string oil
7). The parameters of the numerical control system
2). Proportional directional directional control valve
3). Close valve leakage
4). The pressure difference between the two sides is large
5). Low oil temperature
6). Oil cylinder upper chamber string oil
7). The parameters of the numerical control system
13. The sliding block oscillates and shakes when the dead point is pressed
1). A raster ruler can be problematic
2). Air bubbles are contained when oil cylinders discharge pressure oil
3). The balance valve is blocked
4). Parameters of numerical control system (gain)
5). Back pressure valve problem, the two sides resistance is different
6). Electromagnetic proportional valve problem: the median may not be correct
2). Air bubbles are contained when oil cylinders discharge pressure oil
3). The balance valve is blocked
4). Parameters of numerical control system (gain)
5). Back pressure valve problem, the two sides resistance is different
6). Electromagnetic proportional valve problem: the median may not be correct
14. No return movement or slow return
1). There is no commutation of the electromagnetic proportional change valve, whether it is damaged or not
2). The system has no pressure, or the return pressure is too small
3). There may be a liquid-filled valve stuck or not fully open
4). Slow down the valve and turn off the filling valve, it is unable to return quickly
5). Numerical control system: the programming Angle is too small to reach the dead point by bending programming
6). The numerical control system parameters are zeroing
7). Damage or line-line problems of raster ruler
8). Check if system pressure builds slowly
2). The system has no pressure, or the return pressure is too small
3). There may be a liquid-filled valve stuck or not fully open
4). Slow down the valve and turn off the filling valve, it is unable to return quickly
5). Numerical control system: the programming Angle is too small to reach the dead point by bending programming
6). The numerical control system parameters are zeroing
7). Damage or line-line problems of raster ruler
8). Check if system pressure builds slowly
15. Shake when sliding block returns
1). The return pressure is too high or too low
2). System parameters or PLC and DM02 modules
3). There is no deflection of the proportional valve coil
2). System parameters or PLC and DM02 modules
3). There is no deflection of the proportional valve coil
16. Sliding block (top dead center)
1). Adjustment of back pressure valve
2). Backpressure valve leakage or quick down valve leakage
3). Oil cylinder upper chamber string oil
4). Proportional valve offset
5). The sealing ring supports stable performance, which shows the slide of sliding block after deformation
6). Determine the cause of the slide - after removing the proportional valve, and observe whether oil is out of the lower chamber oil
2). Backpressure valve leakage or quick down valve leakage
3). Oil cylinder upper chamber string oil
4). Proportional valve offset
5). The sealing ring supports stable performance, which shows the slide of sliding block after deformation
6). Determine the cause of the slide - after removing the proportional valve, and observe whether oil is out of the lower chamber oil
17. The Angle of bending Angle is large
1). Check that the compensation cylinder compensation deflection is too large to fully recover zero
2). Check whether the clip-on is loose
3). Check whether there is any change in the dead point under each fold
4). Check whether the bow lever installation is standard and the screw hole is dead
5). Changes in the plate itself (thickness, material, stress)
6). The raster ruler is not loose
7). The positioning accuracy is not accurate: whether the offset value of the proportional valve is suitable, the positioning cannot go down to the dead point to make it unable to return
2). Check whether the clip-on is loose
3). Check whether there is any change in the dead point under each fold
4). Check whether the bow lever installation is standard and the screw hole is dead
5). Changes in the plate itself (thickness, material, stress)
6). The raster ruler is not loose
7). The positioning accuracy is not accurate: whether the offset value of the proportional valve is suitable, the positioning cannot go down to the dead point to make it unable to return
18. The bending straightness error is large
1). Check whether the offset deflection of the compensation cylinder is suitable
2). Check whether the clip-on is loose
3). Check the horizontal and vertical mold veneer on the slide block
4). Check whether the upper and lower molds are deformed
5). Changes in the plate itself (thickness, material, stress)
6). Check whether the table (neutral plate) is deformed
2). Check whether the clip-on is loose
3). Check the horizontal and vertical mold veneer on the slide block
4). Check whether the upper and lower molds are deformed
5). Changes in the plate itself (thickness, material, stress)
6). Check whether the table (neutral plate) is deformed
19. The leakage of oil or tubing in the hydraulic pipeline
1). Check whether the installation of tubing is required (extend length, diameter, wall thickness, card sleeve, nut too tight, too loose, bending radius, etc.)
2). Whether the tubing has impact or vibration
3). Check whether the pipeline is colliding with other interferences
4). No pipe clamp is fixed
2). Whether the tubing has impact or vibration
3). Check whether the pipeline is colliding with other interferences
4). No pipe clamp is fixed
20. Precautions for installation and maintenance of hydraulic systems:
1). The valves of the paint seal shall not be disassembled or adjusted
2). After the valve is cleaned and working normally, new oil must be replaced immediately and the tank should be cleaned
3). The oil pump shall not be subjected to any percussion during the installation of the oil pump
4). The valve shall be installed only with its body and shall not be exposed to any solenoid valve
2). After the valve is cleaned and working normally, new oil must be replaced immediately and the tank should be cleaned
3). The oil pump shall not be subjected to any percussion during the installation of the oil pump
4). The valve shall be installed only with its body and shall not be exposed to any solenoid valve
21. Common failure analysis of backstop material
1). The rear stop material cannot move:
① check the driver for alarm
② check the shaft limit switches
③ verify the reliability of the connectors
2). Alarm of drive
3). The operation of X and R axis is not stable, and there is jitter
4). Change of positioning accuracy:
② check the shaft limit switches
③ verify the reliability of the connectors
2). Alarm of drive
3). The operation of X and R axis is not stable, and there is jitter
4). Change of positioning accuracy:
① mechanical problems (whether there are looseness or impact)
② electrical - directional orientation
③ adjustment of parameters
④ whether the tightening wheel is loose and the screw is loose
5). Overload alarm: if the ball screw can turn easily, the steel bead may be damaged
6). Alarm of R axis drive 16
7). No.22 alarm of Z1 and Z2 axis, change encoder cable
8). No.38 alarm, the connection of the line is loose
9). The servo motor makes noise: the gain setting is too large
② electrical - directional orientation
③ adjustment of parameters
④ whether the tightening wheel is loose and the screw is loose
5). Overload alarm: if the ball screw can turn easily, the steel bead may be damaged
6). Alarm of R axis drive 16
7). No.22 alarm of Z1 and Z2 axis, change encoder cable
8). No.38 alarm, the connection of the line is loose
9). The servo motor makes noise: the gain setting is too large
Comments
Post a Comment