As an important mechanical equipment in engineering construction, excavators have many different classifications, and each type plays a key role in specific engineering scenarios.
1. Classification by walking mode
1. Crawler excavator: This type of excavator has strong passability and stability and can adapt to various complex terrains. The crawler has a large ground contact area and less pressure on the ground, and can easily operate in soft land, muddy construction sites, and rugged mountains. For example, in large-scale mining and large-scale infrastructure construction projects, crawler excavators are indispensable main equipment. Crawler excavators are also more common in the second-hand market. Due to its strong durability, many second-hand crawler excavators can still perform well after proper repair and maintenance, providing a cost-effective option for some engineering teams with limited budgets.
2. Wheeled excavator: Wheeled excavator has high maneuverability and can be quickly transferred between different construction sites. Its driving speed is relatively fast, which is suitable for use in projects that require frequent movement such as urban construction and road maintenance. In the second-hand market, wheeled excavators are also favored by some users because of their flexibility. However, when buying a second-hand wheeled excavator, you need to pay attention to check the wear of its tires and the performance of the driving system to ensure that the equipment can operate normally.
II. Classification by size
1. Small excavator: usually refers to an excavator with a total weight between a few tons and more than ten tons. Small excavators are small in size and flexible in operation, suitable for operations in narrow spaces, such as urban pipeline laying and garden construction. There is also a large demand for second-hand small excavators in the market. For some small engineering contractors or individual operators, the price of second-hand small excavators is relatively low, and at the same time, it can meet their operating needs.
2. Medium excavator: The total weight of a medium excavator is generally between more than ten tons and several dozen tons. It is widely used in various construction projects and municipal projects, with moderate operating capacity and efficiency. The performance and price of second-hand medium excavators are relatively balanced, and it is one of the choices for many engineering teams when upgrading equipment.
3. Large excavator: The total weight of a large excavator is usually more than tens of tons, with strong digging force and operating range. It is mainly used in large-scale construction projects such as large mines and water conservancy projects. The price of second-hand large excavators is relatively high, but for some large engineering companies with specific needs, buying second-hand large excavators can reduce costs to a certain extent, while also meeting the needs of the project.
III. Classification by transmission mode
1. Hydraulic excavator: Most of the excavators on the market are hydraulic excavators. The hydraulic system can provide powerful power and precise control, making the operation of the excavator more flexible and efficient. In the second-hand hydraulic excavator market, there are many different brands and models of equipment. Buyers need to carefully evaluate the performance, sealing of the hydraulic system, and the wear of each component to ensure that they purchase reliable second-hand equipment.
2. Mechanical excavator: Mechanical excavators mainly rely on mechanical transmission to achieve excavation actions. Although the application in modern engineering is relatively small, it still has its unique advantages in some specific scenarios. The number of second-hand mechanical excavators is relatively small, but its price may be more affordable, which may be an option for some cost-sensitive users.
In short, the classification of excavators is rich and diverse, and the second-hand excavator market also provides more choices for users with different needs. When buying a used excavator, users need to make comprehensive considerations based on their project requirements, budget, and the actual conditions of the equipment, and choose the type and brand of excavator that suits them. At the same time, it is recommended to choose a reputable second-hand equipment dealer or have the equipment evaluated by a professional testing agency to ensure that you purchase a second-hand excavator with reliable quality and good performance.