QZK series program-controlled paper cutters use the hydraulic principle for paper pressing and cutting operations. Due to the pressure wear of the hydraulic components or fatigue aging, the equipment often has different degrees of oil leakage, such as the early small amount of oil leakage problems cannot be obtained Timely and effective treatment may lead to a large amount of oil leakage, resulting in a reduction in paper pressure and cutting pressure, resulting in other equipment failures, and at the same time causing pollution to the surrounding environment of the equipment.
The following is an analysis of the common situations that cause oil leakage problems, and proposes solutions for reference.
1. The oil filling hole on the top of the turbine box drains oil
The oil drain hole at the top of the turbine box is one of the more common oil leakage failures of QZK series paper cutters. The turbine box is injected with 40 # mechanical oil, but the oil that comes out of the fuel filler hole is the relatively thin mechanical oil in the large oil cylinder. This is mainly due to the aging and wear of the small oil cylinder "Y" type polyester seal ring, which causes a lot of pressure Oil enters the turbine box from the small cylinder. The solution is to replace the sealing ring, remove the oil inlet pipe of the small cylinder, and remove the fastening screws between the small cylinder and the turbine box, then the entire set of small cylinders can be removed, then disassemble the back cover and spring of the small cylinder, and push out the piston See the damaged seal ring (the seal ring has shaft and hole models must be distinguished). When installing the sealing ring, pay attention to the opening of the sealing ring "Y" toward the oil inlet direction of the oil pipe, otherwise the pressure oil may also seep into the turbine box. It may be more convenient to immerse the sealing ring in hot water during installation. In addition, when installing small cylinders, be especially careful of the flat bearings on the push rod, which can be adhered with grease to prevent them from falling during operation.
2. The upper part of the large piston drains oil
When the foot presser and the hands start the paper presser, the piston of the large oil cylinder is pushed up, and the paper presser drops to press the paper. At this time, there is obviously oil flowing out of the upper part of the big piston along the piston cylinder. One situation is that the exhaust screw on the upper part of the piston is not tightened to drain the oil. At this time, the loose exhaust screw can be tightened. If the above possibility is ruled out, it is generally the aging and damage of the "O" seal ring between the piston cover and the piston body, resulting in oil leakage from the joint surface between the two. The solution is: step on the paper presser with the boot turned on, and place suitable wooden blocks between the top of the paper presser and the frame, so that the paper presser cannot be lifted when the foot is relaxed, turn off the power, and the top of the piston It will disengage from the large roller in the paper pressing assembly (if it is not completely disengaged, press lightly with your hand and the piston will descend). Unscrew the top of the piston, remove the gasket, and expose the six hexagon socket screws that fix the piston cap and the piston. Remove these screws and take out the piston cap to see the "O" seal ring and replace it. During the installation, pay attention to the six hexagon socket screws that fix the piston cover, otherwise the high-pressure oil may leak out. [next]
3. Oil drain at the shaft of the oil pump and the shaft of the turbine box
When the oil pump is working at high pressure, there will sometimes be oil leakage at the shaft output. This is due to the damage and aging of the skeleton seal ring at this place. At this time, the oil pump must be disassembled and the seal ring replaced. The operation method is relatively simple, but The power must be turned off and the mechanical oil in the oil sump must be drained.
There are two common cases of oil leakage at the shaft of the turbine box. One is that the skeleton seal ring fixed on the end cover of the worm bearing is damaged or aging. The oil in the turbine box flows out along the rotating shaft (generally the flow rate is not large) , This must replace the sealing ring. The specific method is: turn off the power, place the knife seat at the lowest point, remove the pulley end cover, loosen the backwash washer and lock nut on the worm, and pull out the pulley assembly. Use the two threaded holes on the clutch to press the edge of the clutch and the spring gland with two pressure plates. After tightening the screw, the spring retaining ring on the worm shaft is separated from the spring gland, remove the spring retaining ring, and then remove the spring The gland, clutch disc, bearing end cover can be replaced with the skeleton seal ring. Another situation is that the “O†seal ring on the small push rod is damaged, which causes the oil in the turbine box to flow out of the groove pin along the small push rod. To replace this sealing ring, the operation is more complicated. In addition to the operation of first removing the clutch disc, the small oil cylinder must be removed and the push rod can be replaced to replace this "O" type sealing ring. During the installation operation, it must be noted that the notch of the groove pin needs to be inserted into the notch of the small push rod.
Due to the unsatisfactory anti-aging and wear resistance of seals in the hydraulic system of domestic equipment under pressure and high frequency action, the phenomenon of oil leakage after the equipment is used for a period of time is relatively common. During daily maintenance and disassembly operations, it is recommended to replace the seals of the relevant parts as early as possible to reduce the hidden danger of oil leakage. At the same time, pay attention to observe the changes in the oil level of the equipment to avoid equipment failure caused by insufficient oil pressure due to oil leakage.
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