What is a hydraulic jack? How many types of hydraulic gravity lifting jacks are there?

Concept of hydraulic jack

Hydraulic jacks are also known by many other names as hydraulic jacks. Because it operates mainly on the piston and pressure mechanism, this device is also called a piston hydraulic jack.

The main function of hydraulic jacks is still to help lift large objects and heavy loads quickly and gently. In the past, lifting objects weighing tens of tons was often a big challenge, causing many people difficulty. But now, hydraulic jacks have become an effective solution, making lifting simple with only a small impact force.

When we need to find equipment to lift heavy objects, we have two popular options: screw jacks and hydraulic jacks. While screw jacks are often used to move large objects such as buildings or cars, hydraulic jacks are more versatile, being able to assist in lifting elevators, motor vehicles, and many other pieces of equipment.

Structure of hydraulic jack

Hydraulic jacks, whether large or small, are made up of basic parts such as locks, valves, hydraulic oil tanks, piston 1 and piston 2. Hydraulic oil is the main fluid used to create thrust, and Depending on the load requirements or lifting stroke, the piston size of each type of jack will be different.

Each part of the hydraulic jack is designed and assembled according to a strict layout, creating a complete and effective device. Manufacturers always focus on simplifying the design to make hydraulic jacks compact, easy to move and install, and suitable for many different working spaces.

The material used to make the jack is usually high quality steel and alloy, has good bearing capacity and can withstand short-term overload. Not only do these materials help the device operate durably, these materials also protect the jack from corrosion and oxidation due to the impact of dirt, weather and the environment. Therefore, hydraulic jacks always ensure durability and efficiency in long-term use, meeting the lifting requirements in industry and life.

How does hydraulic jack work?

The operating principle of a hydraulic jack is quite simple, similar to how a water gun works. When you pull the trigger, the water flow is compressed and creates a strong thrust. Hydraulic jacks also work according to the same mechanism, but with a much larger thrust.

The operating principle of hydraulic jacks can be divided into two stages: pushing up and lowering.

- Push up phase: When piston 2 moves down a section L1, valve number 3 will close, preventing oil from flowing back. Oil from the tank will enter the cylinder through one-way valve No. 4. At this time, piston No. 6 in the cylinder will lift the object up a distance L2.

- Lowering phase: When the piston moves up, one-way valve No. 4 will close to prevent oil from flowing back. Piston 2 will lower a distance equivalent to L2, causing the load to be lowered.

In some cases, it is necessary to lower piston number 6 and the load to serve the job, the user only needs to open lock number 5 to clear the oil tank and cylinder. This mechanism makes adjusting the position of the lifted object easier and more flexible, suitable for different work requirements.

Product reference:

MASADA MS-2 hydraulic jack

Yato YT-17000 2T hydraulic jack

TORIN BIGRED T91204DX hydraulic jack (12 tons)

Classification of hydraulic jacks

Hydraulic jacks can be classified based on many different criteria, each type is suitable for specific needs.

First type: According to lifting load. This is the most common classification, based on the maximum lifting capacity that the device can withstand. Based on this criterion, hydraulic jacks are named according to their load, such as 5-ton, 10-ton, or 50-ton jacks, and there are many products from different brands to choose from. This is also the most important criterion when considering buying a hydraulic jack, because it determines the ability to meet the user's lifting needs.

Second type: According to the lifting direction. This classification is less diverse, only including one-way jacking and two-way jacking. This classification is based on the direction of movement of the object to be lifted, which can be vertical or horizontal. Each type of jack will have a different structure to suit the lifting direction and specific requirements during use.

Third type: By name. The names of hydraulic jacks are often based on the shape or structure of the device. For example, "short jack" often refers to jacks that can lift loads of less than 10 tons and have a low design for easy use in narrow spaces. Or "crocodile jacks" are designed to firmly grip flat surfaces. Names such as "millet jack," "hook jack," or "cargo jack" are also given based on the specific function and structure of each type of jack.

Conclude:

Above is the basic knowledge about hydraulic jacks and how this device works. Hopefully through this information, you will have more understanding about the types of hydraulic jacks, thereby making it easier to choose the right product for your work needs.