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What Is The Principle Of Jack
- Jul 10, 2020-
The jack is a lifting device, but it is only a small one. The jack is mainly divided into a mechanical jack and a hydraulic jack.
Hydraulic jacks
The well-known jacks are hydraulic jacks. The principle is the Pascal principle, that is, the pressure in the same horizontal plane is the same in a closed container. This should be easy to understand. As long as you have touched the physics textbook in middle school, it will not be forced. .
Its calculation formula is P=F/A, so sometimes a person can still press a car in a closed container.
The principle of hydraulic jack is like this: in a balanced system, the pressure exerted on the smaller piston is smaller, and the pressure exerted on the larger piston is also larger, so as to keep the liquid still. Therefore, through the transmission of liquid, we can get different pressures on different ends, so that we can achieve the purpose of transformation.
Mechanical jack
The mechanical jack pulls the handle back and forth, and when the claw is pulled, the ratchet wheel clearance is rotated. The small bevel gear drives the large bevel gear and rotates the weight lifting screw, so that the lifting sleeve can be lifted or lowered to achieve the function of lifting tension.
This kind of mechanical jack is relatively small, often used in life, the force is certainly not as big as the hydraulic. In fact, we often see a kind of mechanical jack in our life, which is called scissors jack. It is to swing the handle back and forth to make the top move up and down, which is easy to understand.
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