Hydraulic system operation of hydraulic wrench

　　First, the hydraulic wrench lubricates all parts of the main engine, secondly, open the air relief valve and the shut-off valve and connect the oil level indicator and oil tank, put the manual reversing valve in the oil supply position, and start the hydraulic pump. When the air relief valve comes out with clear oil Close the bleed valve. The pressure of the hydraulic oil entering the starting cone at the top of the hydraulic cylinder is below 10 kg/cm2, the follow-up cone rises slowly and the oil level in the fuel tank drops slowly. When the moving cone rests on the fixed cone, the oil pressure rises sharply. At this time, the oil supply should be stopped immediately. With the manual reversing valve at the middle position a, the oil level after static can be used as the zero position of the discharge port scale. Put the manual reversing valve at position c, the hydraulic oil returns to the oil tank under the gravity of the moving cone, the oil level in the oil tank rises, and the difference in the reading of the discharge port scale corresponding to the oil level in the oil tank is the change in the discharge port. After adjusting the discharge port, close the stop valve, and the hydraulic oil is sealed between the stop valve and the hydraulic cylinder. When the oil pressure of the top starting cone exceeds 15-20 kg/cm 2 or more at the beginning of withering, the oil pump should be stopped immediately, and the reason should be found and eliminated.

　　When the hydraulic wrench encounters large pieces and materials that cannot be broken, the high pressure oil compresses the nitrogen in the energy accumulator, and when the iron pieces come out, the high pressure oil is pressed back to the oil cylinder by its pressure to make the crusher automatically resume work.

　　When the hydraulic wrench passes the iron block, the high-pressure oil is required to flow to the energy accumulator quickly, and after the quick block is removed, the high-pressure oil quickly lifts the moving iron under the action of the energy accumulator. In order to prevent the moving cone from impacting the fixed cone at this time, there is no one-way throttle valve.

　　In order to control the maximum crushing force not to exceed the design value, the hydraulic system has no high pressure relief valve (its set pressure is 120 kg/cm2). When the oil pressure exceeds 120 kg/cm2, the high-pressure oil flows back to the fuel tank.

　　The high-pressure relief valve is used to control the pressure of the high-pressure oil in the system to keep a constant, so as to protect the safety of the hydraulic components. Therefore, it is also called a safety valve.

　　In addition, since the bevel gear of this hydraulic wrench is under the eccentric shaft sleeve, it is inconvenient to adjust the gap, so it is necessary to find the gear gap through the pulley: Climb the V-belt back and forth in the forward and reverse directions, and the gear teeth will be in contact with the front and back respectively, corresponding to each type The following clearance of the crusher.

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