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Troubleshooting and troubleshooting of a moment - limiting hydraulic coupling
Nov 03, 2017

7.1 the failure analysis and troubleshooting of the motor switch to the working machine after the installation of the coupler

Ordinal number

Cause analysis of failure

Troubleshooting method

1

The coupling does not fill

Fill in the qualified number and the appropriate number of working media according to the specification

2

The filling rate is not good (too little)

Check the filling amount, add liquid and verify the correctness of the filling

3

The machine (or reducer) is stuck

Troubleshoot a working machine (or reducer).

4

Whether the size of the coupling is too small

The working machine (or reducer) has no failure;

The coupling rate is 80%, if it still does not rotate,

The selection of the coupling should be considered.

You need to replace the large coupling.

5

Motor shaft, working machine (or reducer) shaft has no key or roll key

Reload or repair

7.2 the motor speed is normal, and the output of the coupling device is less than the rated speed of the fault analysis and elimination method

Ordinal number

Cause analysis of failure

Troubleshooting method

1

The machine overloads, the coupling automatically increases the slip and the output speed decreases.

Check the current of the motor, whether it exceeds its rated current, determine the overload, reduce the amount of added material or take other measures.

2

The liquid filling amount is too low, the transmission power is insufficient, the slip difference increases, the output speed decreases.

Check the filling amount according to the previous method, add the liquid and verify the correctness of the filling

3

The size of the coupling device is small, the coupling power is low and the output speed is reduced.

The working machine (or reducer) is not overloaded, and the coupling rate is 80%. If the output speed is still too low, it is necessary to consider whether the coupler specification is small.

Large coupling needs to be replaced (to give the power a certain degree of abundance).

4

The coupling itself has the failure of impeller damage, bolt cutting, interference, sweep, etc

If there is a strong noise inside the coupling during the rotation, the coupler has a malfunction and should be repaired or replaced in time.

7.3 the fault analysis and troubleshooting method for the frequent spraying of hot and fusible plugs

Ordinal number

Cause analysis of failure

Troubleshooting method

1

The working machine overloads, the coupling slip increases, the output speed is reduced, the lost power is converted into heat, the coupling is hot

Check the current of the motor, whether it exceeds its rated current, determine the overload, reduce the amount of added material or take other measures

2

Insufficient filling amount, the coupling slip increased, the loss function turned into heat, and the coupling heat

Check the filling amount according to the previous method, add the liquid and verify the correctness of the filling

3

Excessive amount of liquid, or full of coupling, liquid heating and expansion, may turn oil cap

Check the filling amount according to the previous method, properly release the liquid and verify the correctness of the filling

4

The melting point of the fusible plug is too low

Replacement of the melting point with high melting point

5

The coupling starts too frequently, and when it starts, the pump turns to the turbine, and the slip is very large. The function of the loss is converted into heat, which makes the coupler warm

Eliminate unnecessary frequent starts

If it must be started frequently, it can improve the melting point temperature of fusible plug and the coupling device with larger size

six

The coupling device is small, the transmission power is insufficient, the output speed is reduced, the loss function is converted into heat and the coupling heat

Select a larger coupling (to give the power a certain abundance)

seven

Low voltage of motor, lower voltage, lower motor speed, lower coupling speed, less power of coupler and heat.

In order to eliminate the power failure of the power grid, temporarily replace the fused plug with high melting temperature

8

After adding the coupling, the original pressure start time is too long, the coupling is too long, the speed is low, the slip difference is large, the transmission power is insufficient, and the heating temperature is heating up

Shortening the time of the reduced pressure

7.4 the reason analysis and elimination of the failure of the shaft accident in the drive unit of hydraulic coupling device

Ordinal number

Cause analysis of failure

Troubleshooting method

1

The unit installation accuracy is not good, if the motor, the coupling device, the reducer install different heart, then the reducer will bear the radial force generated by the different heart, resulting in the broken shaft accident.

Be sure to meet the requirements in the instruction manual when the installation is in place

2

The frame foundation stiffness is not enough, the force deformation and vibration, causing the motor, the coupling, and the reducer are seriously incoaxial, causing the reducer to break the shaft.

The foundation and foundation stiffness must be stronger,

The stiffness of reinforcement can be improved by means of reinforcement

3

The axial diameter of the motor and the reducer shaft is too large, such as the speed input shaft diameter of the reducer.

Using the driving mode of ocean shipping, coupling ontology is installed on the reducer shaft, gear reducer diameter of axle is very fine, but bear the weight of the coupling, combined with different radial force generated by the heart, easily broken shaft accidents.

Switch to inner wheel drive coupling, motor shaft

Assume the weight of the coupling and allow the reducer's high-speed shaft to bear the weight of the coupling.

7.5 failure analysis and elimination of vibration and noise produced by unstable equipment

Ordinal number

Cause analysis of failure

Troubleshooting method

1

Motor - coupling - speed reducer is installed with different heart and vibration during operation

According to the installation of the previous article, find the positive method to achieve the same degree of concentricity

Tighten the anchor bolt, preferably with a limit stop to fix the body

2

The base stiffness of the frame is not enough, the disturbance is generated in the operation, and the whole system is in vibration mode

It is necessary to strengthen the stiffener on the frame and improve the stiffness of the frame

Damping or damping device or other vibration reduction measures are adopted

3

The motor and reducer base are loose

Reinstall the alignment, tighten the motor and the reducer base, preferably with anti-loose gear

4

Motor, reducer failure, such as bearing damage, rotation of different heart, producing vibration

Remove motor and reducer failure

5

The elastomers of the coupling can't compensate for the relative deviation of the two shafts

Check regularly to replace worn elastomer in time

six

The shaft and bore are loose with wear, and the gap is too large to produce vibration

The worn shafts or holes shall be repaired and reassembled after being qualified

seven

Failure of coupling blade, impeller and shell interference, bearing damage, etc

Replace the bearing, repair the damaged impeller, or replace the new coupling

8

The coupling was not balanced after maintenance

Recombine the coupling