This is our special way of repairing humans: giving a hard blow from the outside to achieve the purpose of repairing.
There are actually many reasons why the machine does not work temporarily:
1. Aging, aging or not using oil for a long time to dry and dust, will lead to increased starting resistance, you just let the old man move around after taking a pat...
2. Poor contact, this is normal, some lines may be a little bit short of good contact, and it can be contacted and then work with a little vibration.
First of all, the behavior of knocking when the machinery is broken is not a product of our era, it should have originated in a period when electricity was not so developed.
Up to now, it’s enough to just tap it, and most of them are mechanical structures (motor and its accompanying mechanisms, fans, washing machines), or machines with a lot of slots and dense wires (such as desktop hosts, TVs), old ones Sometimes a desktop computer can be turned on by tapping it, but when something goes wrong with a laptop like this, no one's first reaction is to tap it.
I have seen the master of a large machinery factory encounter something that does not turn, and after looking it up and down, he takes out a big wrench and smashes it. In many cases, this does not meet the specifications, but it is a simple and effective behavior.
The causes of mechanical problems are complex and varied:
The first is the starting resistance. The oil in the machine can flow. If it is not used for a long time, some parts of the lubrication will not be so good, which will increase the starting resistance. When the motor is running, the maximum output torque needs a certain speed. The torque is often smaller than this torque. If the starting resistance is large and the torque is small, it may cause failure to start normally.
I have felt this since I was a child. If the battery of the small racing car is low, the motor will not turn when you turn on the switch. You can turn it by rubbing your hands.
Insert a picture to explain it, it is not completely correct but easy to understand:
I used to think that the maximum static friction is approximately equal to the dynamic friction when I was studying, but in fact the maximum static friction is slightly greater than the dynamic friction.
picture
Soul Painter is online!
Then the resistance will drop further after the lubrication system is linked
picture
The second is that the mechanical structure just meets the dead point. In the crank-link mechanism, when the connecting rod is used as the active part, if the pressure angle of the position is 90 degrees, the connecting rod cannot drive the driven part to work at this time.
picture
The rocker is the active part, and the dead point occurs when the connecting rod and the crank are in the same line.
For old-fashioned pedal sewing machines, sometimes you need to turn the handwheel by hand if you can't step on the pedal, which is basically the reason.
picture
This is the slider crank mechanism, the mechanism of the internal combustion engine cylinder and the crankshaft. The slider C is the active part, and the dead point occurs when ABC is three points and one line.
No matter how great the driving force is at these positions, they cannot drive the follower. These mechanisms originally rely on inertia (flywheel) to pass through the dead point, but if they are at the dead point when starting, there is no way. The behavior of knocking is Vibration is used to destroy the state of these dead points (in the car, the motor is first used to start the rotation).
Then there is the spring part because of aging or in the wrong position, the resistance is too high, it is stuck and cannot rebound in time, and some of them will not get up when they are pressed.
Then there is poor contact, and some mechanical cables are densely arranged, which may cause local rust, detachment, or local short circuit caused by dust falling for a long time. Once you connect it, you can use it...
But if you go to Paida with poor contact, it means that you have taken on another risk—even worse contact. However, generally speaking, a bad contact is a bad contact, and no one cares about the problem, even if there is only a 0.1 chance to restore it to normal after taking a photo, I will still try it, and sometimes I even want to take a photo of a bad contact. The place can come off directly, so I can know where the problem is, which is much easier than finding one by one among dozens of wires.
Modern electrical appliances are so developed, if the unresponsive ones are mobile phones, watches, laptops, etc., there are not many mechanical structures, and there are not many interfaces for plugging in wires.
That's right, the mechanical hard drive is talking about you!
picture
Disk-type mechanical hard disk data is stored in the disk sector, and collisions and vibrations may cause mechanical damage and cause data loss.
Of course there are also examples where vibration is required to work properly...
Japanese Type 97 grenade!
picture
Needle Fuze! After pulling out the insurance, you have to knock it again to trigger it...
It is said that the devil knocked his head (steel helmet) and threw it out...
The first time I know this is from the movie "Hands Up", the protagonist didn't know how to use the grenade and didn't become a martyr...
picture
Then there is even more outrageous, arguably the most coincidental unlucky thing, the Soviet fighter plane flew over the five countries and crashed and killed people.
On July 4, 1989, this MiG-23 took off from a military airport in Poland, preparing to perform a combat readiness cruise as usual. The pilot of the plane was Colonel Skuridin, an old pilot of the Soviet Air Force. The plane suddenly stopped midway, and the pilot tried his best but was helpless. Seeing that the flying altitude was less than 200 meters, he had to parachute to escape in desperation.
But what surprised Colonel Scullidin was that just after he ejected from the cockpit, the engine of the plane started up again inexplicably. Instead of crashing down, the plane raised its head straight into the clouds. The colonel hadn't landed yet, but he watched his fighter jet flying farther and farther away and disappeared, dumbfounded.
In this way, due to the high-speed flight and the small size of the small European countries, this MiG-23 flew over their borders in the hesitation of various countries, and the unlucky Brussels, Belgium, was its final destination. Counting the MiG-23's initial take-off from Poland to Brussels, it crossed almost the entirety of Europe, flying over five of Poland's neighbors.
picture
The unmanned MiG-23 fighter jets slowly flew over the airspace of Poland, crossed the then Democratic Germany, and slowly flew into the then Germany at 7:40. It had entered Dutch airspace when two American planes were ordered to intercept it. The American pilots were surprised to find that the plane had no canopy, and there was no pilot on board.
The American pilot was surprised and immediately reported to the ground command. The command post ordered to follow behind and see what happened. If the plane poses a threat to the densely populated area on the ground, it will be shot down immediately.
The unmanned MiG-23 fighter jets did not fail to fly over the airspace of the Netherlands steadily. Since then, the speed of the aircraft has gradually slowed down, and the flight status is not stable enough. At 8:37, it suddenly fell headlong and landed on a house in a small village 80 kilometers west of the Belgian capital Brussels, killing a 19-year-old young man.
This unmanned MiG-23 fighter jet flew more than 900 kilometers after the pilot parachuted, crossed the airspace of 5 European countries, avoided the bustling and dense urban area of Brussels, and had already flown the entire flight until it crashed. 79 minutes.
For this flight accident that surprised the world, the former Soviet Union and Western countries have made various explanations, but there are different opinions, including some theological hypotheses. But in any case, this matter is fully qualified to be included in the Guinness World Records.
Afterwards, the Soviets explained that the vibration of the pilot's ejection fixed the plane. . .
High-tech fighter jets can be knocked down by external forces, not to mention the machinery or electrical appliances in your home.
