Self-unloading semi-trailer refers to a semi-trailer that can automatically tip over at a certain angle when unloading materials. Its market coverage is relatively high. It plays an irreplaceable role in the transportation of goods.
Compared with ordinary semi-trailers, the working conditions of dump semi-trailers are more complicated. If the product quality is not up to standard, it is easy to have problems, most of which are cracking.
Specific manifestations of dump truck cracking:
1. The weld seam between the overturned beam and the web is cracked
During the use of the tipper semi-trailer, the torque is relatively large, especially the lower wing plate. The torsion acts on the tilting beam through the tilting beam bracing, resulting in a large stress at the welding point between the tilting beam and the web, and the weld is easy to crack.
2. Cracking of suspension ribs
Generally speaking, the arc angle at the cross-section change of the suspension rib of the dump semi-trailer is small, so the stress is too concentrated. fracture. Especially when the vehicle passes through complex road conditions, there will be torsion here, and cracks will appear in the web.
3. Suspension diagonal brace and suspension big brace are cracked
The suspension is an area with a large torsion, especially when the frame is turning quickly, the lateral force on the tire will act on the frame through the axle, leaf spring, suspension, etc., so the moment the frame bears Larger ones, especially at the lower wing, are more likely to be twisted and cause cracks in the inner and outer support plates.
4. Suspension brace cracking
The upper web of the suspension of some dump semi-trailers has no rib support and reinforcement, and the suspension braces are not welded to the connecting pipe. Diagonal brace cracking.
5. The tilting beam of the sub-frame strengthens the diagonal brace and cracks
There are generally two reasons for the cracking of the oblique bracing reinforced by the overturning beam of the subframe: the longitudinal beam of the subframe and the overturning beam are cross-jointed, and the strength is weak. When the vehicle is overturned and unloaded, the overturned beam is deformed; The oil cylinders are not synchronized, and the subframe is prone to torsional cracking.
As for the reasons for the cracking of the dump truck, the main reason is whether the design is reasonable and the production process is not up to standard.
Some manufacturers manufacture dump trucks according to the design ideas of ordinary semi-trailers. In fact, in addition to the general load-bearing capacity, the design of dump semi-trailers also takes into account the body, frame, The stress of different parts such as suspension. In addition, whether the material selection is standard, whether the welding seam is firm, whether the selection of each component meets the standard, etc., are all key factors affecting the quality of the vehicle.
So, when choosing a car, what aspects should you choose from?
The design should be reasonable and the weight should be appropriate. The chassis should be stable, and the center of gravity should be relatively low. Of course, it is necessary to carry out system planning in consideration of load, cargo type, road conditions, and driving habits. Nowadays, the trend of lightweight trailers is prevalent, and dump trucks can also be considered lightweight in terms of materials and other aspects. However, due to the particularity of the dump truck’s working conditions, it must not blindly sacrifice strength to pursue lightweight.
Pay attention to the selection of vehicle materials. Steel can be divided into high-strength steel, manganese steel, and ordinary steel. Different types of steel can be divided into different models. For example, high-strength steel can be divided into 700, 900, 980 and other models. The rise of the car will gradually increase, but the weight of the car body will gradually decrease, and of course the cost of construction will also increase.
The production process must pass the test. Nowadays, the production automation of large trailer factories is gradually popularized. Processes such as welding and painting have been automated, and the processing quality has also been improved to a certain extent. Sand blasting and rust removal are indispensable, paint spraying must be uniform, and electrophoretic coating is of course better. Paint can also be divided into alkyd paint and polyurethane paint, the latter is more high-end.
The hydraulic lifting system should be stable, for example, the design of the oil circuit should be reasonable, the lifting of the cylinders should be synchronized, and so on. After all, the hydraulic system is the power source for the tipping and unloading of the dump truck, and the stable operation of the hydraulic system can ensure the normal unloading.
The key parts must be reliable, such as axles. There are many brands of axles on the market at present, with large differences in price, quality and performance. Try to choose those brands that have independent factories, have customized production capacity, come out earlier, and have passed market verification. These products are more reliable to use and have more after-sales guarantees. Help car owners reduce many follow-up unnecessary troubles.
