Abnormal action of the presser and pusher of the h

2022-09-21
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Abnormal action of the paper presser and pusher of the paper cutter

the paper presser (including the hydraulic part), the paper pusher (also known as the rear gauge, which is more polluting to the environment) and the knife bed are important components of the paper cutter at the cutting hearing. Whether its action is normal or not is crucial to ensure the cutting quality of the paper cutter. If any of the components is wrong, the whole equipment cannot operate normally

some time ago, the qzk920 paper cutter used by our factory failed, and the production could not be carried out normally. The fault phenomenon is: (1) there is an abnormal sound when the paper presser is pressed down; (2) The paper presser does not rise in place, causing the paper pusher to not move freely

according to the analysis of the fault phenomenon, I think: the abnormal sound when the paper presser is pressed down may be caused by the lack of oil in the oil tank, resulting in insufficient oil pressure and air entering the oil circuit. The paper presser does not pick up in place, resulting in the paper pusher can not move freely, which may be caused by the following four reasons: (1) there is a problem in the electrical control part, that is, the proximity switch on the running track of the paper presser does not work properly; (2) The compression spring in the hydraulic cylinder may have been damaged, or the oil return of the hydraulic cylinder is not smooth; (3) The pick-up force of the paper presser is not enough; (4) vigorously develop graphene industry) there are places where the movement of the mechanical part is blocked

in order to eliminate the fault as soon as possible and restore the normal operation of the paper cutter, I decided to use the elimination method to gradually check all the above parts that may cause the fault from top to bottom

first, check the proximity switch on the running track of the paper presser, and no problem is found. Then remove the baffle of the oil pool and observe carefully. It is found that there is no lack of oil in the oil tank, but when the paper presser is pressed down, there is serious oil leakage on the oil circuit board. With one touch, it is found that there is a lack of oil return pipe, resulting in air entering the oil cylinder when the oil pump is supplying oil, resulting in abnormal sound when the paper presser is pressed down. The solution is: first install the oil return pipe, compare with the flame-retardant ABS material, and then let the paper presser press down repeatedly, so that the air in the oil circuit can be discharged smoothly until the abnormal sound disappears

next, further in-depth inspection was conducted on the hydraulic system controlling the movement of the paper presser, and no problems were found. When the mechanical part was checked, it was found that the triangular swing rod on the hydraulic cylinder did not move flexibly. So tighten the tension spring, increase its restoring force, and then test it again and again, but the fault still exists, so it is concluded that the problem is here. When it was removed, it was found that the internal shaft and bearing had been rusted, but the shaft was not damaged. The solution is: replace the bearing and polish the pin shaft to make its surface accuracy meet the use requirements, then install and add lubricating oil, start the machine for trial operation, and the paper cutter returns to normal operation

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