The most popular old printer teaches you how to ju

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The old printer teaches you how to judge the printing machine failure from the sound.

some old printers will know if there is a problem with the machine by listening to the sound of the machine. If there is a problem, what is the problem. In fact, this is not a difficult task. So how can we "know the disease by hearing the sound" in the process of printing machine operation

1. Learn to listen to the sound and remember the normal sound characteristics

take the J2108 offset press as an example. In the normal production process, all kinds of sounds will be heard at the same time, including the main motor, air circuit, teeth, paper receiving chain, as well as the moving parts, swinging parts and even oil circuit of the ink roller in the wallboard. In such a complex sound, it must be difficult to distinguish which part is emitted at the beginning, but you can gradually get familiar with it in the process of daily operation

step 1: listen roughly from local or single parts.

for example, when you press "run", the main motor will make a sound during operation. After a certain time delay, you can drag the main engine to run. At this time, there are more sounds. You can listen to the corresponding parts. For example, the ear is close to the wall panel to listen to the sound made by the moving parts when reversing; Open the "ink on" button to hear the sound of swinging parts back and forth; When you drop the press plate water roller or press plate ink roller, you can hear the low sound when the rubber roller jumps to the press plate cylinder working surface; Close to the paper gripper, you can hear the sound of the paper gripper and the roller gripper continuing the opening and closing of the experiment; Open the "paper feeding on" button to hear the sound of Feida running; Turn on the air pump, and you can hear the sound of the air circuit

step 2: listen carefully

the training of this step is based on the familiarity with the mechanical parts and their motion laws. The motion of each part of the offset press has a strict time relationship, so listen according to the sound rhythm when each part moves. During daily work, if the machine operates normally, you can listen carefully, grasp a sound that is easy to distinguish, and then listen to the sound of other parts according to the time relationship of the movement of each part

for example, during paper feeding, the sound of blowing and inhaling is interwoven with the sound of mechanical movement. We can take the "Pa Pa Pa" sound produced by the overturning of the paper separating nozzle and the collision of the cylinder block as a landmark sound in the whole operation process, followed by the air blowing sound of the paper pressing and blowing nozzle and the down pressure monitoring system, accompanied by the slight shaking sound of the paper, followed by the sound of the paper blowing by the loose paper blowing nozzle, which is rhythmically and periodically emitted. Another example is the paper delivery tooth and the roller tooth. In the past, the material used for the tooth pad surface was nylon, but now they are all steel surfaces. Therefore, the "click click" sound when the tooth is closed is relatively large, especially when the paper is not received, this sound feature is more obvious. Under normal circumstances, the sound of these two kinds of teeth is very neat, and the sound of drum teeth is louder, because the force of drum teeth is larger than that of paper teeth. Listening to these sounds often and remembering the sound rhythm of these components during normal operation will be of great help to judge whether the machine works normally

2. Use sound features to judge machine faults

when we are familiar with various sound features, we can use them to help production, judge and solve some practical problems

example 1: judge the printing pressure

if the printing pressure is normal (the pressure between the printing plate cylinder and the rubber cylinder is 0.15mm, and the pressure between the rubber cylinder and the imprinting cylinder is 0.2mm), the impact sound between the three cylinders is slightly low during the imprinting process. Once the printing pressure increases, such as the thickness of the rubber lining increases, there will be a "bang bang" sound. At this time, the thickness of the lining and the center distance must be measured again to ensure the accuracy of the pressure. If the pressure of the press plate cot and the press plate cot is too high, similar noises will also occur. At this time, it can be judged by checking the width of the ink bar

example 2: judging the paper feeding fault

during the production process, the sound emitted by the paper feeder has a rhythm. If you master this rhythm, you can judge whether the paper feeding is normal as long as you listen. For example, the paper cannot be absorbed by the suction nozzle, the leather ring is damaged and leaked, and the paper pressure blowing nozzle and the rear suction nozzle fight will destroy the normal rhythm and produce abnormal sound, which is often the precursor of the paper feeding failure. At this time, it is necessary to quickly check the working condition of the paper feeder to eliminate the failure in the bud and ensure the smooth progress of paper feeding

example 3: judge the tooth failure

the closing sound of the paper gripper and the drum gripper is very neat. When starting up and running, the machine speed is slow, and it is easy to hear the closing sound of "Pa Pa Pa Pa". Although the sound director: we will further implement good quality supervision and testing, it is not very clear, if the sound becomes fuzzy, it is best to check the working conditions of the large springs at both ends and whether the needle bearings lack lubricating oil. In the design of China Transport 20 large transport aircraft and C919 large passenger aircraft,

example 4: judge the oil circuit fault

if there is a lack of oil or the oil circuit is blocked, the sound inside the wallboard will increase, which is mainly caused by the increased friction of the friction surface of the components. In winter, the temperature in the workshop is low, and the consistency of the lubricating oil increases. When the machine starts running, it will make a "buzzing" sound. If the workshop has an air conditioner, you can increase the temperature of the air conditioner. If this condition is not met, you can change the mechanical lubricating oil with a lower number

in a word, as long as the operators carefully understand in the production process, especially the multi-color machine has more mechanical parts and more complex noise, but as long as they carefully summarize, they will certainly hear some experience, find out the rules, and diagnose the fault by smelling the sound. I hope these personal experiences can help you

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