In the past, I often heard the master say: "As long as you listen to the sound of this machine, you will know if there is any problem with this machine. If there is a problem, where is the problem." In fact, this is not a difficult thing. So how can we "smell the sound and know the disease" during the operation of the printing press?
1. Learn to listen to the sound and remember the normal sound characteristics
Take the J2108 offset printing press as an example, in the normal production process, all sounds are humming, the main motor, air path, tooth extraction, paper collection chain, and the ink roller moving parts, swinging parts, and even the oil path in the wallboard Wait, these parts will make a sound. In such a complicated voice, it must be difficult at first to distinguish which part is emitted, but you can slowly get familiar with it during the daily operation.
Step 1: Rough listening from local or single parts
For example, when you press “Runâ€, the main motor generates sound. After a certain delay, the main unit is dragged to run. At this time, there are more sounds, and you can listen to the corresponding part. For example: the ear is close to the wall board to hear the sound of the moving parts when switching; turn on the "ink on" button, you can hear the sound of the swinging part swinging back and forth; when you fall against the plate water roller or the plate ink roller, you can hear the glue The low sound when the roller jumps to the working surface of the plate cylinder; near the transfer nip, you can hear the sound of transfer nip and roll nip opening and closing; turn on the "feed open" button, you can hear The sound of Feida running; turn on the air pump, you can hear the sound of the air circuit.
Step 2: Listen carefully
This step of training is based on familiarity with mechanical parts and their movement rules. The movement of each part of the offset press has a strict time relationship, so you should listen to the rhythm of the sounds produced when each part moves. In the course of daily work, if the machine is operating normally, you can listen closely, grab a sound that is easier to distinguish, and then listen to the sound of other components according to the time relationship of the movement of each component.
For example, in the process of paper feeding, the sounds of blowing and inhaling are intertwined with the sounds of mechanical movement. We can regard the sound of “splashing†that the suction nozzle of the separation nozzle turns over and the cylinder block hit as an iconic sound during the entire operation, followed by the sound of the pressure blowing under the paper blowing nozzle accompanied by the slight paper The jittering sound was followed by the sound of loose paper mouthpieces blowing paper, and these sounds were made periodically and in rhythm. Another example is the paper-handling and roller-handling. The material used in the front of the dental pad was nylon, and now they are all steel surfaces, so the "clicking" sound made when the teeth are closed is relatively large, especially not This sound characteristic is more obvious when receiving paper. Under normal circumstances, the sounds of these two types of teeth are very neat, and the sound of roller teeth is louder, because the force of the roller teeth is larger than that of the paper. Listening to these sounds often, and remembering the rhythm of the sounds produced by these components during normal operation, will be of great help in judging whether the machine is working properly.
Second, use sound characteristics to judge machine failure
When we are familiar with various sound characteristics, we can use it to help production and judge to solve some practical problems.
Example 1: Determine the printing pressure
If the printing pressure is normal (the pressure between the plate cylinder and the blanket cylinder is 0.15mm, and the pressure between the blanket cylinder and the impression cylinder is 0.2mm), then during the stamping process, the impact sound between the three cylinders is slightly deep. Once the printing pressure increases, such as the thickness of the rubber liner increases, there will be a "bang" sound, then the thickness of the liner and the size of the center distance must be re-measured to ensure the accuracy of the pressure. If the pressure between the rubber plate and the printing plate is too high, a similar noise will also be produced. At this time, it can be judged by checking the width of the ink bar.
Example 2: Judging the paper feed failure
During the production process, the sound of the paper feeder is very rhythmic. After grasping this rhythm, as long as the ear listens, you can judge whether the paper feed is normal. If the suction nozzle can't suck the paper, the apron is damaged and leaks, the paper pressure blowing nozzle and the rear suction nozzle fight, etc. will destroy the normal rhythm and produce abnormal sounds, which is often a precursor to the paper feed failure. The working condition of the paper machine eliminates the fault in the bud state to ensure the smooth progress of paper feeding.
Example 3: Judging the problem of teething
The sound of hand-cranking and drum-crushing is very neat. When the machine is turned on, the machine speed is slow, and it is easy to hear the "popping" closing sound. Although the sound is not loud, it is very clear. If the sound becomes blurred, It is best to check the working conditions of the large springs at both ends and whether the needle bearings lack lubricant.
Example 4: Judging the fault of the oil circuit
If there is no oil or the oil passage is blocked, the sound inside the wallboard will increase, mainly due to the increased friction of the friction surface of the component. In winter, the temperature in the workshop is low, the consistency of the lubricating oil becomes larger, and the machine makes a "buzzing" noise when it starts to run. If the workshop has air conditioning, the temperature of the air conditioner can be adjusted higher. If this condition is not met, the number can be changed Lower mechanical lubricants.
In short, as long as the operator carefully understands in the production process, especially the multi-color machine has more mechanical parts, and the sound is more complicated, but as long as you carefully summarize, you will definitely hear the experience, find the rules, and smell the sound. Diagnosis.
Round Dining Table,Dining Table 6 Seater,Dining Table 4 Seater,Corner Dining Table
CAMOSA HOME , https://www.camosa-funiture.com