Views: 0 Author: Site Editor Publish Time: 2024-11-11 Origin: Site
The hand jack is a commonly used type of jack. Its principle is to achieve the operation of lifting objects by rotating the hand crank. The hand jack is usually composed of the main part, hand crank, gear set, screw rod, support base and other parts.
The main part is mainly composed of steel plates and castings, which are connected to the hand crank through a pull rod to fix the structure of the entire jack. The hand crank is the main handle of the manual operation jack, and the screw rod is rotated by rotating the handle. The gear set is an important part of the hand jack. It consists of gears and bearings, which are used to transmit the rotation force of the hand crank to the screw rod. The screw rod is the core component of the hand jack. It is a spiral lever that drives the jack up and down through its rotation. The support base is the bottom structure of the hand jack. It can fix the position of the jack to prevent the jack from sliding or tilting during use.
How to use a hand jack
A hand jack is a simple and easy-to-use type of jack. How to use it is as follows:
1. First, place the hand jack under the object to be lifted or supported, making sure that the jack is in a horizontal state and the supporting base is stable.
2. Then insert the hand crank into the gear set and rotate the hand crank to start the gear set to rotate.
3. The rotation of the gear set will drive the rotation of the screw rod, which will cause the lifting rod of the jack to rise or fall.
4. When you need to stop the lifting of the jack, just stop the rotation of the hand crank.
(1) The foundation of the jack. The foundation of the jack should be stable, solid and reliable. When setting up the jack on the bottom, it should be padded with road blocks or other appropriate materials to expand the force-bearing area.
(2) Placement of the jack. When placing a jack on soft ground, wooden blocks should be placed under the jack to prevent it from tilting after being stressed. When the weight is raised, support pads should be placed under the weight at any time, but hands should not enter the danger zone by mistake. When placing the jack, keep the load center of gravity action line consistent with the jack axis. During the lifting process, be careful to prevent the jack from tilting or tilting due to the jack foundation sinking or the horizontal displacement of the load. To prevent the jack from sliding on the metal surface or concrete smooth surface of the weight, pad it with hardwood blocks if necessary.
(3) Lifting operation. The lifting height of the jack should not exceed the effective lifting range. When lifting large objects (such as beams), the two ends should be lifted and lowered separately. When one end is lifted and lowered, the other end must be padded, firmly padded, and placed firmly. The jack must not be overloaded.