L46A3 Mast Section For Tower Crane Masts

Products Specification

Type , Model: L46A3 Mast Section For Tower Crane Masts

Size: 1.6mx1.6mx3m 

Materials: Q345B

Within: Pins, bolts, Ladder, Platform

Process: Blasting derusting, 

Painting:  Under painting , Middle painting, Surface painting.

Our factory produce and supply almost all famous brand tower crane :Mast section, Anchor Frame, Fixing angle ,Adaptor and so on as good quality and price.

L46A3 Mast Section For Tower Crane Masts

Tower Crane Knowledge sharing:

Tower crane hydraulic jacking system fault analysis and testing, maintenance, maintenance

From the above analysis, in order to make the hydraulic jacking system can work normally, in addition to the control of hydraulic oil pollution path, but also in time to find those hydraulic components have decreased efficiency.

In the tower crane jacking operation, according to the pressure, speed, movement and other abnormal conditions, it can be found that the hydraulic jacking system efficiency decreases, but the whole system cycle is closed。

There are many components, to determine the fault parts according to the phenomenon of a test, elimination, time-consuming and laborious; And in the case of loading, a little inadvertently easy to cause equipment accidents, for the sake of safety, often take the overall replacement of the hydraulic jacking system for processing.

However, in the maintenance of the hydraulic jacking system, due to the lack of the weight of the superstructure of the tower crane, the working pressure of the system is 0, and the hydraulic components are controlled by the oil pressure.

L46A3 Mast Section For Tower Crane Masts

After the pressure drops, it is impossible to accurately judge those components whose efficiency decreases.

In the past, the commonly used detection method is to block the two outlets of the manual directional valve, and then start the system.

By operating the manual directional valve and the overflow valve, observe the pressure gauge reading and look for the failure element according to the pressure change.

However, there is a defect in this method, only abnormal pressure can be found, while other abnormal conditions such as speed and movement cannot be checked. Once it is put into use again, it will be found that the system is still unable to be used normally due to the failure cause not completely cleared.

In order to accurately diagnose the cause of the efficiency decline of the hydraulic jacking system in the non-working state, it is necessary to simulate the actual working conditions and test each hydraulic component under the working pressure of the system.

According to the working principle of the hydraulic jacking system, during the jacking operation of the tower crane, the piston rod of the hydraulic jacking cylinder needs to jacking the structure above the tower crane jacket.

L46A3 Mast Section For Tower Crane Masts

Therefore, the oil chamber pressure P1 of the hydraulic cylinder reaches the working pressure, and the oil chamber is connected to the oil return pipeline, and the pressure P2=0. In system maintenance, due to lack of the upper structure of tower crane weigh, in order to make oil cavity P1 to working pressure and the oil return pipe cavity a test valve installed on the road。

 By adjusting the pressure of the test valve, to improve the oil cavity pressure P2, to promote the movement of the piston rod, oil cavity pressure P1 should also subsequently rise, until working pressure is reached.

Thus the real state of the hydraulic jacking system in the tower crane jacking operation is simulated, and the purpose of testing the system without load is achieved.

Tower crane hydraulic jacking system maintenance

Connect the components and pipes of the whole system, install the test valve, start the motor, and run the whole system

By observing the system generated by the various phenomena, analysis can determine a drop in the efficiency of hydraulic components to observe the change of the pressure gauge readings, and compared with normal。

By analyzing the pressure is too low, too high, and causes of the instability, can determine the cause of abnormal pressure hydraulic components, such as relief valve, pump, hydraulic cylinder, etc.

L46A3 Mast Section For Tower Crane Masts

Observe the piston rod telescopic movement speed changes, compared to the normal value, if the speed is lower than the normal value, can determine the abnormal speed of the hydraulic components, such as the lock valve, gear pump, etc..

Observe whether the action of the actuator is slow, irregular or the mechanism crawling state, check the sequence of action and stroke control, can determine the cause of abnormal action of the hydraulic components, such as manual reversing valve, hydraulic cylinder piston.

Observe whether the whole system has abnormal vibration, noise, oil leakage, oil temperature is too high, can be analyzed to determine the cause of abnormal parts and treatment, such as pipe joints, filter, sealing ring.

Through the fault analysis and detection of the hydraulic jacking system, the early diagnosis and elimination of the fault can be achieved, which can effectively reduce the probability of system fault, and can be convenient and timely detection of hydraulic components with reduced efficiency, to ensure the safe use of the tower crane.

L46A3 Mast Section For Tower Crane Masts