Hydraulic cylinder uncoordinated reasons
Concrete pump two concrete delivery cylinder by a master cylinder driven. The two main hydraulic cylinders are divided into rod connection and rod connection. There are two connection ways for the two main hydraulic cylinders. Since two main cylinders have rod or rodless chambers connected in series, under normal circumstances, the operation speed should be coordinated Consistent. However, during actual use, sometimes there are two main cylinders running speed inconsistency phenomenon, that is, one run faster and the other is relatively slow to run.
This phenomenon will produce two kinds of adverse consequences: First, will make the slow operation of the main hydraulic cylinder in the absence of the completion of the pusher is forced to start the direction of the commutation, so that the end of the stroke push weakness; Second, it will lead to run more Fast main hydraulic cylinder in the pusher in place after an obvious pause before commutation.
When the rodless chamber connection is used, if any one of the two main hydraulic cylinders has a serious internal leakage, the above fault occurs. Main hydraulic cylinder leakage is mainly due to piston wear or piston seal is too large damage.
When the B cylinder rod chamber into the oil, the piston rod retracts and drives the concrete cylinder suction, while pushing the A cylinder piston rod driven concrete tank feeding. At this moment, if there is a serious internal leakage in cylinder A, when the piston rod pushes the concrete material, the rodless chamber pressure oil will leak to the rod chamber. Connecting cavity pressure oil leakage, will cause the cylinder B to complete the normal suction stroke, A cylinder thrust is not in place, but must also be reversed.
When the A cylinder rod chamber into the oil, the piston rod retracts and drives the concrete cylinder suction, while promoting the B cylinder piston rod driven concrete tank feeding. If there is a serious internal leakage A cylinder, the rod cavity pressure oil will leak to the communication chamber, which will result in the B cylinder piston rod speed, A cylinder piston rod slow down.
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