Trouble phenomenon: no pressure can be established, no action on the upper knife holder.

Cause of failure: Poor contact of the electrical plug of the electromagnetic directional valve.

Troubleshooting method: Check the electrical plug. The spool of the electromagnetic directional valve is blocked by debris or does not act on the roughened surface; the sealing part of the spool of the combined valve has debris and does not play a sealing role; each orifice in the combined valve is blocked and checked for disassembly and cleaning. The return stroke of the upper knife holder is slow or cannot return to the top dead center. The action sequence of the upper knife holder and the pressing cylinder is not coordinated; the nitrogen pressure of the return cylinder is insufficient. Check and adjust it to the rated pressure separately.

2. Adjustment and operation of shearing machine

(1) Adjustment of cutting edge clearance

Whether the cutting edge clearance is adjusted properly is an important factor that affects the cutting quality and prolongs the life of the blade. When adjusting the gap, temporarily loosen the locking screw, then turn the handle to the desired scale value, and then tighten the screw. The ball valve is used to measure the uniformity of the gap between the upper and lower blade edges. The specific method is to use a single stroke when the upper and lower racks reach the bottom dead center, that is, quickly turn the ball valve to close the oil path, so that the upper knife holder stops at the bottom dead center. Then continue to open and close the ball valve by a small amount, so that the upper blade holder rises step by step over the full stroke, at this time, the uniformity of the blade gap can be measured step by step. Trouble and elimination of the hydraulic system of the shearing machine

(2) Preparation before the operation

① Clean the oil on the surface of each machine, pay attention to the line on the cut-off valve that should be in the open position.

② Inject grease into each lubricating part. Trouble and elimination of the hydraulic system of the shearing machine

③ Add L-HL46 mechanical oil to the oil tank (the oil must be clean).

④ Ground the machine, press the power supply and check the coordination of the actions of the electrical appliances.

(3) operating

① Turn on the machine for several cycles. After ensuring that there are no abnormal conditions, try to cut sheets of different thicknesses (from thin to thick).

② During the shearing process, turn on the pressure gauge switch and observe the pressure value of the oil line. If there is any abnormality, adjust the relief valve to meet the requirements. Trouble and elimination of the hydraulic system of the shearing machine

③ During operation, if abnormal noise or overheating of the fuel tank is found, stop the vehicle immediately and check that the maximum temperature of the fuel tank does not exceed 60 degrees.

3. Safety technology and maintenance of the shearing machine

(1) The operator must be familiar with the structure and performance of the shears. Shearing machines are operated by most people at the same time, so someone must be in charge of directing the production.

(2) Never put your hand between the upper and lower blades to avoid accidents. Trouble and elimination of the hydraulic system

(3) Do not put all the sundries and tools on the workbench to avoid accidents caused by rolling into the blade. Trouble and elimination of the hydraulic system of the shearing machine

(4) The sharpness of the blade should be checked regularly. If it is found that the blade is blunt, it should be sharpened or replaced in time. The sharpness of the blade only needs to sharpen the thickness of the blade.

(5) All parts of the shears should be checked regularly to keep the machine and the surrounding area clean, and the cable insulation is good.

(6) The mesh oil filter installed on the oil suction port of the oil pump should be regularly checked and cleaned to keep the oil filter with the proper oil flow. If the oil filter is clogged and the oil flow is reduced, the oil pump will be sucked down, affecting the life of the oil pump. (7) When the pressure of the return cylinder is low, the return cylinder can be inflated. The method is: remove the protective cap and the gas valve cap, install the inflation tool, the other end of the inflation tool is connected to an ammonia gas bottle (no oxygen), open the inflation tool, and slowly open the nitrogen bottle stop valve, pay attention to the inflation pressure gauge. Close the cut-off valve of the gas cylinder immediately to 6.0MPa. Close the inflation tool, open the inflation tool, and install the air valve cap and protective cap. 8. Check the nitrogen pressure in the return cylinder every three months. If the pressure is lower than the specified pressure, it should be filled with nitrogen. Trouble and elimination of the hydraulic system