Which jack is better and what is the feature of the choice?
Construction jacks of various types are widely used in many industries, in industry, for performing some assembly and repair work. This is a mechanism that is designed to lift and fix various loads at a certain height. This article will tell you about which jack to choose.
So, first thing you need to figure out what kind of jacks there are. According to the device and the principle of operation, the lifts can be divided into three types: screw, rack and hydraulic. Each of them performs its own set of operations, and when choosing this is worth remembering.
If you describe the purchase of this tool in a few words, then first you need to determine the volume and frequency of work, and then with the type of device and its level of professionalism. After all, to overpay for unnecessary functions, and then to find out that it is impossible for your device to perform its tasks, it will be very insulting.
Screw and rack jacks - what is it?
The screw jack differs from other lifting devices in that its working element is a screw that is driven by the rotation of the handle. From the direction of rotation of the handle will depend: lift the screw load or lower it.
A special bowl is attached to the screw using hinges. Also, some screw jacks are equipped with a sled, with which you can move the lifted cargo horizontally. This type of device is used for any type of linear cargo movements that require a high pressure force.
Screw mounting jacks have both advantages and disadvantages. To the merits can be attributed a small effort, which is applied to the drive handle. A significant working stroke, a large lifting height and a small own weight made this kind of jacks quite popular. Small footprint, large dimensions and insufficient stability are significant drawbacks of devices of this type.
The working unit of the rack jacks is a steel strip with a load-bearing cup located on it. They are widely used for pre-fixing of goods and their further movement during construction, installation and repair work. Such mechanisms are also used to lift cargo with low pick-up.
High efficiency, ease of operation, smooth running - the main advantages of rack jacks. Almost the only drawback is the large size and weight.
Hydraulic devices - how do they differ from others?
Hydraulic jacks are used in construction most widely. They are divided into bottles and podkatnye. The principle of their work is based on the movement of the piston. The lever activates the pump, which pumps the working fluid through the valve into the cylinder, and the liquid in turn pushes the piston.
These devices are widely used in installation and construction work, in the aftermath of accidents and disasters. They are characterized by stability, rigidity of construction, compactness, precise fixation of cargo at the correct height. Their shortcomings are a small lifting speed and a small working stroke.
Before using any type of jack, it is necessary to make sure that all components are in good condition, if necessary, lubricate or top up the working fluid. The choice of the jack determines its main operating characteristics, namely: maximum load capacity, lifting height, pick-up height, stability, applied force on the handle, dimensions and weight.
Almost all of these criteria is best matched by a hydraulic jack, which is probably why it is the most common. But at the same time, it is not universal, as it can not be used, for example, to raise scaffolding.
Before choosing a lifting device, you need to determine what the jack is for, and what work it will be performed with. Before you choose a jack and buy it, you need to make sure that this is a reliable and high-quality mechanism, because this may depend on someone's life.
