Views: 3 Author: Site Editor Publish Time: 2020-12-10 Origin: Site
Jack is often used in our daily life as a machine, and the supporting use of the jack is the jack stand. But many people don't know how to use jacks and jack stands to support heavy objects. Here's how to use jacks and jack stands to support heavy objects.
What is a jack？
How we use a jack？
What is a jack stand？
How to set up jack stands？
Jack is refers to the use of rigid jacking as a working device, through the top of the pedestal or the bottom of the supporting claw small stroke of lifting heavy lifting equipment. Jacks are mainly used in factories, mines, transportation and other departments as vehicles repair and other lifting, support and other work. Its structure is light and firm, flexible and reliable, one person can carry and operate.
(1) Foundation of jack. The foundation of the jack should be smooth, solid and reliable. When setting jack on bottom face, should pad on road wood or other appropriate material, in order to enlarge stressed area.
(2) Jack placement. When the jack is placed on the soft ground, the wooden blocks should be put under the jack so as not to tilt and fall under the force. When the weight is raised, the support pad should be placed under the weight at any time, but the hand should not enter the danger zone. During the placement of the jack, the action line of the load center of gravity should be consistent with the axis of the jack. During the jacking, the risk of the jack being tilted or tilted due to the deviation of the jack foundation or the horizontal displacement of the load should be strictly prevented. To prevent the jack from sliding on contact with the metal or concrete surface of the weight, a hardwood block is used if necessary.
(3) Jacking operation. The jacking height of the jack shall not exceed the effective jacking path. When lifting large objects (such as girder) should be separated at both ends of the rise and fall, one end of the rise and fall, the other end must be solid, solid, put steady. Jacks shall not be used in excess of load.
Start the jack should not be rapid, should have a uniform pace of rise, drop slowly. When multiple jacks are used at the same time, operate simultaneously. After the operation of the jack, it shall be carefully checked to check the oil pressure and hidden trouble, and shall be maintained and placed in an appropriate place.
Jack stand is used to support the object, usually used in conjunction with the hydraulic jack. When the Jack lifts the object, the security support is placed in the appropriate position for a long time to support.
The jack stand should be placed under the weight after the weight is lifted by the jack. It should be noted that the position of the jack must be accurate and perpendicular to the weight (vehicle), otherwise it is easy to deform the weight.
Beginners can learn how to safely and correctly hold the jack and jack stand.
In principle, the hydraulic jack is based on Pascal principle, that is, the pressure of the liquid is the same everywhere, so in a balanced system, the pressure exerted on the smaller piston is relatively small, and the pressure exerted on the larger piston is also relatively large, which can keep t