Views: 4 Author: Site Editor Publish Time: 2021-04-13 Origin: Site
Vehicle positioning jacks is brand new tool designed for all sorts of operations. You will use it in very short time consumption for many operations, such as change your car tires, lift a vehicle, etc. It's no need to use other tools as vehicle positioning jacks widely used in many areas, including vehicle workshop, car service shop, auto tool shop, car maintenance shop, and garage. Vehicle positioning jacks allow a single person to move cars, trucks and ATV's around the repair facility with ultimate flexibility.
A vehicle positioning jacks is a small and light lifting device that uses a steel lifting piece as a working device and uses a top bracket or a bottom bracket to lift heavy objects within the stroke. According to the structural characteristics, it can be divided into three types: rack jack, screw jack and hydraulic jack. vehicle positioning jacks is the simplest lifting equipment with small lifting height (less than 1m). It has two types: mechanical and hydraulic. There are two types of mechanical vehicle positioning jacks: rack type and screw type. Because of their small lifting weight and laborious operation, they are generally only used for mechanical maintenance and are not suitable for bridge repair. The hydraulic jack has compact structure, stable operation and self-locking effect, so it is widely used. The disadvantage is that the lifting height is limited and the lifting speed is slow.
2.1 Principle of hydraulic positioning jack
In principle, the principle based on the hydraulic jack is the Pascal principle, that is: the pressure everywhere in the liquid is the same, so that in a balanced system, the pressure exerted on the smaller piston is lower, and the larger piston the pressure applied is also relatively large, so that the liquid can be kept still. Therefore, through the transfer of liquid, different pressures on different ends can be obtained, so that a transformation can be achieved. The hydraulic jack that we commonly see uses this principle to achieve force transmission.
2.2 Principle of mechanical positioning jack:
The mechanical jack adopts the mechanical principle. The handle is pulled back and forth, and the pawl is pulled to push the ratchet gap to rotate. The small bevel gear drives the large bevel gear to rotate the lifting screw, so that the lifting sleeve can be raised or lowered to achieve the lifting force. Features. But it is not as simple as a hydraulic jack.
The types of car positioning jacks can be divided into four types: rack jacks, screw jacks, hydraulic jacks and pneumatic jacks.
Rack jack: It is composed of three parts: rack, pinion, and handle. It relies on shaking the handle to make the rack rise and fall; this is also a common type of car jack for ordinary cars. It is not large in size and is better to store. But also because of this, it limits its supporting weight not too much.
Hydraulic jacks: Hydraulic jacks are divided into general hydraulic jacks and special hydraulic jacks. The advantage of its use is that the lifting speed is fast and the load-bearing capacity is larger than that of the rack jack.
Screw jack: The screw jack relies on the self-locking thread to support heavy objects. The structure is not complicated, but its supporting weight is relatively large. However, the work efficiency of this screw jack is slow, rising slowly and falling fast.
Inflatable jack: This kind of jack may feel a little strange to everyone, because this type of car jack is not common. It relies on the exhaust gas of the car to inflate it, so the use conditions are relatively special and little known.
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