Electric Stacker pressurization system common failure analysis and troubleshooting

March 13, 2012 Read 1814 times Tags: Electric Stacker Full Electric Stacker Semi-Electric Stacker Stacker
Summary: Electric pallet truck Stacker power cylinder vacuum brake system determines the level of the vacuum booster booster effect is good or bad. The power cylinder vacuum reasons for the decline are: vacuum pumps, vacuum valve and air valve performance is poor or breakage of the power cylinder coating, wherein the vacuum valve, air valve seal bad most common. If the vacuum valve is not sealed, when the pedal is pressed, while the vacuum valve is closed, but the air from the vacuum valve and seat can still penetrate between the front chamber of the power cylinder, causing the power cylinder vacuum decreased, so much thrust rod reduced, can not form the auxiliary cylinder pressure, thereby reducing electric stacker braking performance.
A, Electric Stacker insufficient vacuum booster booster causes and corresponding solutions
Electric Stacker vacuum booster by a pressurized cylinder (auxiliary cylinder), the control room, adding strength to the vacuum chamber (power cylinder) three kinds of composition.
Control valve diaphragm divided internally by about two chambers. Vacuum valve and air valve are one, relying on spring action. Stacker not brake in time, the vacuum valve and the diaphragm seat center hole between the normally open and normally closed air valve to maintain the state. Power cylinder divided by the film before and after the chamber, the first chamber is connected with the vacuum tank, vacuum tank with a vacuum pump connected via a tube; rear chamber through a pipe connected with the right chamber of the control valve. When the electric engine start without Stacker depress the brake pedal is taken, the vacuum booster power cylinder before and after the chamber and the control valve to the left and right chamber so connected with each other with the same degree of vacuum, so the return spring under the action of the power cylinder rod coating in the center rearward limit position.
When electric stacker engine starts, brake pedal, when oil rose to a certain value of the master cylinder brake fluid when its input turbocharger, all the way through the center hole of the flow of the auxiliary piston front left and right brake cylinder; all the way to the right to promote the control valve piston, diaphragm seat to close the vacuum valve, the control valve left and right two chambers isolated (equivalent to the power cylinder before and after the spleen every child) and then open the air valve, after the cavity is filled with the power cylinder air, and the first chamber to maintain a certain degree of vacuum remains. Therefore, before and after the chamber creates a pressure differential to force the power cylinder rod to move forward driven diaphragm, putting the ball off first with the top dead center of the auxiliary piston bore, which in turn push the piston forward, to the master cylinder to the oil plus pressure (boost), and thus obtain a higher brake cylinder hydraulic, electric stacker makes for good braking performance.
Seen from the above works, electric stacker power cylinder vacuum brake system determines the level of the vacuum booster booster effect is good or bad. The power cylinder vacuum reasons for the decline are: vacuum pumps, vacuum valve and air valve performance is poor or breakage of the power cylinder coating, wherein the vacuum valve, air valve seal bad most common. If the vacuum valve is not sealed, when the pedal is pressed, while the vacuum valve is closed, but the air from the vacuum valve and seat can still penetrate between the front chamber of the power cylinder, causing the power cylinder vacuum decreased, so much thrust rod reduced, can not form the auxiliary cylinder pressure, thereby reducing electric stacker braking performance.
Similarly, if the air valve leak, did not step on the brake pedal before the power cylinder had penetrated the air chamber, the vacuum power cylinder when the pedal is more greatly reduced. Therefore, the control valve of the vacuum valve, the air valve is a vacuum booster booster lack the most common point of failure. From our years of maintenance practice, vacuum pump oil is caused by electric stacker vacuum booster damaged a fatal factor. Because vacuum system into the oil can cause the valve, coating damage, if there is pumping oil phenomenon will promptly repair or replace the pump. In addition, the pump performance is not good, connecting pipeline leakage and breakage Kuang Yung Pak Doo-ho and other fabrics have made straight into the turbocharger pressure is insufficient.