Why is the hydraulic slow down of the dump truck fast? Is it short of oil?
Not lack of oil, is a normal phenomenon.Hydraulic jack, also known as hydraulic jack, is a plunger or hydraulic cylinder as a rigid lifting jack. Simple lifting equipment is usually equipped with lifting mechanisms for lifting heavy loads. The utility model has the advantages of simple structure, light weight, portability and convenient movement. The commonly used simple lifting equipments are hydraulic jacks, pulleys and winches.
Hydraulic jack is divided into: general hydraulic jack, special hydraulic jack.The utility model relates to a universal hydraulic jack, which is suitable for various lifting operations with little lifting height. It consists of: 1, 2, 3, the oil chamber oil pump oil chamber main parts 4, 5, 6, piston, crank, valve etc.. When working, as long as the reciprocating crank, the manual pump constant pressure oil to the oil cylinder, due to increased pressure within the cylinder, forcing the weight above the piston and piston upward movement. When the oil return valve is opened, the high pressure oil in the oil tank flows back to the oil storage cavity, so the heavy object and the piston fall together.The special hydraulic jack is a special tensioning machine, which exerts tension on the prestressed steel bar when making the prestressed concrete component. The special hydraulic jack is mostly double acting type. There are commonly used through type and cone anchored two.
The jack has an outer shell, a big piston, a small piston, a wrench, an oil tank, etc.. The working principle is going to drive the small wrench to the piston, the oil tank is sucked into the lower part of the small piston through an oil pipe and a one-way valve wrench, press it down to drive the small piston downward, and the lower part of the piston oil tank small one-way valve plug is small, the lower part of the piston oil through the internal oil path and a one-way valve is pressed into the in the lower part of the piston, the lower part of the piston due to leverage small pressure increases several times, the larger piston area is several times the smaller piston area, oil pressure by manually generated is packed into the large piston, by Pascal principle known size of the piston area ratio and pressure ratio of the same. As a result, the hands of the force through the wrench into the small piston increases by more than 10 times (Zanan 15 times), the small piston to the large piston force has increased more than 10 times (Zanan 15 times), the piston (out of the top of the car when the active part of =15X15=225 times the power of power), if by hand every 20 kilograms, can produce 20X225=4500 kg (4.5 tons) of power. That's how it works. When used up, there is a normally closed valve manually opened, the oil will be the weight of the car to oil back to the tank.
Jacks for tensioning steel beams or steel beams, which is mainly composed of Zhang Lagang, the top pressure cylinder, top pressure piston and spring etc.. It is characterized by: a machine axis along the stretch through the pore, steel (or steel wire) penetrated by the tool after anchor tail.Stretching, open before and after the nozzle, pulling oil supplied from nozzle to the interior after Zhang, Zhang cylinder cylinder moves backward. Because the cylinder cable is anchored on the tool anchor at the jack layer, the jack extends the cable through the tool. When the cable tension to the required length, after closing the nozzle, nozzle inlet pressure before top cylinder, the top pressure cylinder piston forward shift to anchor and anchor plug, plug is pressed into the anchor ring, so that the cable anchor. After opening the nozzle and continue once nozzle into the oil, then a cylinder moving oil cylinder return. Finally, the front nozzle is opened so that the oil in the cylinder is returned, and the top pressure piston is replaced by the restoring spring.
