Circular arc gear pump is a kind of positive displacement pump, which consists of two gears, the pump body and the front and back covers, which form two closed spaces. When the gear rotates, the volume of the space on the side of gear disengagement becomes larger and smaller, , The volume of the space on the meshing side of the gear decreases from large to small, and the liquid is squeezed into the pipe line. The suction chamber and the discharge chamber are separated by the meshing line of two gears. Circular arc gear pump often problems and troubleshooting are as follows: First, YCB arc gear pump high pressure reasons: the drain pipe or filter plug; safety valve spring too tight. Remedy: Clean the oil and filters to remove clogs; adjust the spring so that it is tight and appropriate. Second, YCB circular arc gear pump pressure gauge fails to meet the requirements (pressure gauge can not read a few) reasons: the rotation of the wrong direction; pressure gauge is bad. Remedy: change direction, change pressure phenotype. Third, the arc gear pump oil leakage is due to: string moving gap large; back to the hole installed anti-oil; drive shaft gap big. Remedy: Adjust the gap 0.04 ~ 0.05mm; reassemble; adjust the copper sleeve clearance. Fourth, YCB arc gear pump oil displacement is not enough to adjust to the maximum pressure is still not hit when the oil is: hydraulic pump clearance is too large, the gear surface and the bearing clearance is too large; suction pipe or filter plug , Resulting in oil-absorbing difficulties; speed is not enough, the oil temperature is too low; gear wear. Take the exclusion method: Check and adjust the hydraulic pump clearance, such as the gap is small, you can use paper pad adjustment, such as the difference is too large (greater than 0.05mm), the shell can be worn to a certain thickness, or chrome plated sleeve; Check the oil circuit, cleaning filters, copper wire cloth replacement; increase speed; the oil heated to 35 ~ 50 ℃; replacement gear.
These beads are coated with a special coating during the manufacture of the glass beads. In the rainy and foggy weather, the moisture can not easily adhere on the surface of glass beads, so the effection on reflectivity caused by bad weather will be reduced. The granulometry of this type glass beads is the same as non-coated glass beads.
The glass bead can be produced based on the standard of countries or areas, such as EN1423/1424, AASHTO M247, BS6088, JIS R3301 and KS L2521 etc.
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