A trailer is a vehicle that is towed by an automobile and has no driving force of its own. It is a combination of one tractor and one or more trailers. Trailer is an important vehicle type of highway transportation and an effective means to improve the economic benefits of transportation.

In terms of size, the width of the trailer is generally 2.5m, and there are special 2.55m, 2.8m or 3M. The length standard is generally 13m, but also 10m, 11m, 14.6m, 16m or 17.5m.

So, what is the approximate price of a large trailer?

According to the survey, the selling price of large trailers on the market is between 350000 and 500000, of which the price of tractor is about 250000-350000, and the price of trailer is generally about 100000. Of course, the prices of different types of trailers are also different, and the prices of skeleton cars, fence cars and warehouse cars will be different, which is also related to the configuration of tires, axles, braking systems, etc.

So what are the accessories on the semi-trailer? What kind of good choice?

1. Traction pin. It is mainly used to connect semi-trailer and tractor to realize semi-trailer driving. At present, the traction pins on the market are mainly divided into four types: assembly 50, assembly 90, welding 50 and welding 90. Users can choose and buy according to different models and actual use conditions. The 90# traction pins for semi-trailer with more than 100t can generally meet the requirements.

2. Axle. It is an important part of the vehicle chassis. It is mainly used to load and connect wheels. It plays a key role in the process of vehicle load and power transmission. Domestic brands specializing in axle making and doing well mainly include Guangdong Fuhua, BPW (Meizhou) and Shandong Darong. Among them, Darong axle with the highest cost performance is also one of the earliest axle enterprises producing integrated axle body in China. Its technology and strength are trustworthy.

3. Tires. Tire is an important part of the vehicle in contact with the ground, which plays a role in mitigating impact and maintaining driving. Without the support of wear-resistant, heat-resistant and durable tires, its safety performance and economic benefits are impossible. The most commonly used semi trailers are 11.00R20 steel tire and 12.00r22 5. For vacuum tires, Michelin, saddle wheel Deyi, Chaoyang and Bridgestone are recommended for brands. They are doing quite well.

4. Hub. Also known as steel rim, rim, Gulu and bell, it is the rotating part of the wheel core connected by the column. The hub unit is a relatively precise part of the trailer, including bearings, nuts and many other parts. It supports the wheels together with the axle and tire. Zhumadian Huateng, shuaiwei and Kangmai are recommended.

5. Suspension. It is a force transmission device assembly between the frame and the axle, which is used to transmit the force and torque between the wheel and the frame, buffer the impact force of the road, reduce the vibration and ensure the smooth driving of the vehicle. Suspension can be divided into rigid suspension, single point suspension, air suspension and steel plate suspension. Rigid suspension is mainly used for axis low flat semi-trailer carrying goods at low speed, single point suspension is mainly used for heavy vehicles, steel plate spring balance suspension is mostly used for ordinary semi-trailer, and air suspension is mostly used for the transportation of precision instruments or dangerous chemicals.

6. Legs. It is mainly used to support the semi-trailer when the semi-trailer is separated from the tractor. It is located at the front end of the semi-trailer frame and is the semi-trailer support device. It can be divided into single acting outrigger, linkage outrigger, aluminum alloy outrigger, hydraulic outrigger, pneumatic outrigger and pneumatic hydraulic combined outrigger. Among them, the single acting outrigger is the most basic traditional outrigger, which can be used on flat and concave convex ground; The linkage outrigger is only suitable for flat road surface; The main highlight of aluminum alloy outrigger is that it is lighter than traditional outrigger, but the supporting force is insufficient when it is fully loaded; The utility model is suitable for the hydraulic outrigger with high weight rejection and high cost; Pneumatic outrigger is also suitable for efficient swing and hanging transportation. Its self weight is lighter than that of hydraulic outrigger, but there are few maintenance points at present; Pneumatic hydraulic combined outrigger has higher lifting efficiency, but its structure is complex. If the technology is not mature, it is easy to lead to failure rate.