one Hydraulic winch Properties of

This type of hydraulic windlass By INM type Low speed high torque hydraulic motor Or axial plunger High speed hydraulic motor , normally closed wet multi disc hydraulic disc brake, 1 or 2~3 stage planetary reducer, normally closed dry multi disc hydraulic disc clutch, reel, support shaft, frame and other components; The drum and frame are designed according to the requirements of structural mechanics, and the overall structure is compact and scientific, with sufficient hardness and rigidity. The hydraulic disc brake, planetary reducer and hydraulic disc clutch are all assembled in the reel. The hydraulic winch not only has the advantages of compact structure, small size and exquisite appearance, but also has the advantages of good safety performance, high working efficiency, large starting torque, good low-speed stability, low noise and reliable practical operation. In addition to all functions of the basic winch, the hydraulic winch also has the function of free lowering.

2 Basic principle of hydraulic winch

The power takeoff drives the oil pump to run, the oil pump suction port is interconnected with the oil tank, the high-pressure oil at the oil pump outlet is interconnected with port P, and port T is connected with the oil tank. The high-pressure oil opens the hydraulic brake with the help of the reversing valve and the high-pressure shuttle valve, so that the drum is in the brake release condition, and at the same time, the hydraulic oil enters the oil ports A and B of the motor Drive hydraulic motor function, Hydraulic motor Drive the planetary reducer to rotate. The planetary reducer transmits the power to the disc clutch with the help of spline gear, and finally transmits the power to the winch drum with the help of the disc clutch to rotate the drum. The function of the balance valve is to enable the load to be lowered actively in a balanced manner, and to brake the reversing valve immediately. In order to improve the working efficiency when the empty hook is lowered, a clutch is arranged inside the drum. When the empty hook is lowered, the control oil makes the piston move backward enough to fully disengage the multi plate friction plate, and the drum can rotate flexibly to achieve the lowering condition of Baishan. At this time, the band brake is in the non holding brake condition. The overload protection of the hydraulic winch is realized by the safety overflow valve of the system, which controls the increase of oil pressure due to the overload of the load during the traction process.

3. Common fault analysis and countermeasures of hydraulic winch

7 key factors of winch not running! No pressure oil in the system

Or the pressure does not meet the requirements for use; The motor valve plate is stuck or the movement pair is damaged. Countermeasures: Check the oil supply system and disassemble it for maintenance.

2) Key factors of weak lifting or slow speed of winch: the outlet pressure of oil pump is too low; Insufficient oil; The hydraulic motor has large leakage. Countermeasures: check the overflow valve and oil pump, and take measures to solve them; Find out the factors of insufficient oil supply of oil pump; Repair the motor.

3) The key factors of winch drum creeping: unstable oil supply of hydraulic system; The leakage is unstable. Countermeasures: check the system; Check the leakage and repair the motor.

4) The key factors of the big leakage of the winch motor: the plunger ring is worn, the flow distribution seal is damaged, the plunger and the bearing sleeve are damaged, and the housing has sand holes. Countermeasures: Replace the plunger ring, seal and housing; Disassemble, check and replace parts.

5) Leakage at the joint surface and shaft seal - key factor: bolts are not tightened, and the tightening degree is uneven; The O-ring and oil seal are aging or damaged: the housing pressure is high. Countermeasures: retighten after inspection; Replace the seals; Check whether the system oil circuit can meet the working requirements.

6) Key factors of abnormal sound: the oil filter at the oil inlet of the oil pump is blocked: there is air entering into it: oil

Damaged, with gas infiltration; Damaged parts: external vibration. Countermeasures: Clean the filter screen and filter element; Check the seal with air inlet; Replacement of new oil: inspection and replacement of spare parts; Anti seismic measures shall be taken.

7) After hoisting, the winch cannot be braked or has a slipping condition. The key reason is that the oil inlet and outlet are connected reversely; The back pressure on the return line is too high. Countermeasures: calibrate the oil inlet and outlet pipes or rotate the oil distribution tray 180 °; Check the oil return pipeline to reduce the back pressure as much as possible to ensure the braking torque of the brake.

4. Maintenance of hydraulic winch 4.1 Strictly control the quality of hydraulic oil

Regularly check the quality standard of hydraulic oil. If it is found that the standard value is exceeded, replace it with new oil. It is not allowed to use different types of hydraulic oil for mixed use, otherwise the performance index of hydraulic winch will be affected. The time limit for replacing new oil varies according to different working conditions, and can be specified according to specific conditions. L-HM46 anti-wear hydraulic oil must be used as hydraulic oil, and 10 # 'aviation hydraulic oil must be used in cold areas and winter (atmospheric temperature less than 10 ℃).

When the temperature is less than - 30 ℃, first run the oil pump with full load for 10~15min, then run the winch

Always pay attention to the level of the hydraulic oil tank and whether the hydraulic oil is normal. If there is a lot of foam, stop the machine in time to check whether the oil suction port of the hydraulic system leaks, whether the oil return port is below the oil level, and whether the hydraulic oil can enter the water emulsion.

4.2 Do a good job in safety inspection of working devices

1) Before each use, check whether the winch assembly screws can be tightened tightly and whether the steel rope is damaged. Ensure the orderly arrangement of steel ropes to avoid disordered ropes.

2) The working pressure in the hydraulic motor housing shall not be greater than 0.1MPa. The opening working pressure of the balance valve must be 0.1~~0.4MPa higher than the opening working pressure of the brake, otherwise the winch will tremble when it is released.

3》 When the winch is running continuously, pay attention to the temperature of the hydraulic oil tank. When the temperature exceeds 80 ℃, stop cooling to ensure the operation of the winch

The efficiency is normal.

4.3 It is forbidden to operate machinery and equipment "with fault"

1) If it is found that the working pressure of the system is abnormally increased during operation, stop the machine to check the cause. It can be used to check whether the leakage oil of the hydraulic motor is normal. Generally, when the hydraulic motor is running under load, the amount of oil exposed from the drain pipe for one minute is not allowed to exceed 1L. If there is a lot of oil leakage, it indicates that the hydraulic motor is damaged and needs to be repaired or replaced. If the hydraulic motor is intact, other components in the reel should be inspected.

2) During operation, the working condition of hydraulic winch and system shall be checked frequently. In case of abnormal temperature rise, leakage, vibration and noise or abnormal pulsation of working pressure, the vehicle shall be parked in time to find out the cause and repair as soon as possible.

4.4 Replace the hydraulic oil as soon as possible

The medium load vehicle hydraulic oil 85W/90GL-4) in the winch gearbox shall be replaced after 1000 hours of operation. When replacing, first remove the magnetic screw plug on the reel, slowly rotate the reel to align the reel plug hole with the plug hole on the planetary gear box, then pull the hexagonal wrench on the removal plug to drain the dirty oil, then introduce clean hydraulic oil, remove the adhesive on the magnetic head, and then tighten each plug.

4.5 Common problems of parts replacement

When the hydraulic winch has problems, pay attention not to roughen or bruise the precision parts when replacing the high-precision parts, especially protect the movement and sealing surfaces of the parts. The removed parts shall be placed in a clean container to avoid collision with each other. During assembly, all parts shall be cleaned and dried, and cotton yarn, cloth head, etc. shall not be used to wipe hydraulic parts. A small amount of filtered lubricating oil shall be added to the matching parts. The removed parts shall be carefully inspected and repaired. Damaged or excessively worn parts shall be replaced. In principle, all seals shall be replaced.