Pusher centrifuge horizontal hydraulic system and improve – Centrifuge Hydraulic
Q1 know that the main factors affecting the value gap h, followed by the sealing length l; gap is larger, the larger the internal leakage, the greater the pressure loss. Hydraulic system oil return hole through the unloading E and pusher bar center hole back to the tank, and center hole diameter in less impact on the system back pressure can not be considered.
(3) driven piston leakage Q2 Shown in Figure 1, when the main piston shifted to the right, run into the right end of the piston cylinder wall orientation, the relative left the main piston, when the guide piston faces F G side retreat, I face should have been to reach H surface, so the pressure oil and return oil line is not communication, but because of the piston plate 5, two slots inside the hole is difficult to measure the processing, if not by NC Machine tool Process, often driven back over the piston F G surface has surface, while the H I surface into the face of yet within the inlet, return oil line direct communication, resulting in leakage Q2, leading to increased leakage.
(4) the main slide valve leakage Q3
Generated by the main slide valve seal leakage in addition to the leakage gap between, there are also the main slide valve because the holes on the K in the main slide valve movement in the hole and back into the lead on the timely return to the oil Road direct communication resulting leakage Q3.
4 Improvement The analysis reveals that there are three main internal leak, they leak sometimes be superimposed, and because the system components by machining accuracy and tolerance from the impact of the leakage is higher than the calculated value, must therefore be push to improve hydraulic system:
(1) appropriately increasing the system operating pressure
System operating pressure of the great influence of driving force, may be appropriate to improve system operating pressure. But not too much work pressure, otherwise it will increase the system pressure level, increase system cost.
(2) appropriate changes to the structure size of the piston guide
Oriented piston and piston plate hole match, due to hole size precision control of position within the groove harder, appropriate changes can be easily processed-oriented structure of the piston size to ensure progress, back to asphalt does not directly communication.
(3) the appropriate sealing surface decreases with the gap between the value of
Existing gap with the surface components of hydraulic system design accuracy of seven, with the gap value is larger, should be the main components with the precision surface processing increased from seven to six, the gap with surface minimize the gap value, while the other surface, the same precision, so that parts can take into account the economics of processing, can reduce the internal leakage.
(4) modify the structure of the main slide valve
Main slide valve on the 4 K hole design intent is for the slide valve and the push rod between the introduction of lubricant material to reduce friction, but it led into the moment, back to oil line communication can be K in hole location by processing a few spiral groove music to improve the lubrication oil, while the abolition of holes K. In addition, both ends of the main slide valve oil-free brake pads, both ends of the surface directly with the piston plate collision prone to wear and the accumulation of serious impact on life, structure and materials should be improved on.
(5) reduce the forward, back to the oil resistance
Pushed into the hydraulic system, have a lot of cutting back oil path hole, aperture small, the resistance is higher, the resistance should decrease as diameter increases, while set into the hole Road Regulation screws, adjusting screws by changing the location or switch to a different path of the screw to adjust the fuel supply to adjust the working frequency pusher bar to meet the needs of separating different materials.
5 Conclusion Measures using the above operation a factory in Shandong, three horizontal pusher centrifuge comprehensive improvement of hydraulic system, the system can run effectively solved the pusher feed system due to problems of downtime , trembling and other phenomena, is better. Obviously the quality of these measures have the same problem the improving domestic centrifuge has some reference value.
References [1] Lei Tianjue. Hydraulic Engineering Manual [M]. Beijing: Machinery Industry Press, 1990.
[2] industrial centrifuges used manual [M]. Beijing: Chemical Industry Press, 1998.
[3] Zhang Liping. Hydraulic Pneumatic System Design Manual [M]. Beijing: Mechanical Industry Press, 1997.
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