Self-dumping semi-trailer refers to the semi-trailer whose carriage can automatically tip over at a certain Angle when unloading. Its market coverage is relatively high. By virtue of its advantages in transportation efficiency and transportation cycle, it plays an irreplaceable role in the transportation of loose goods such as sand and gravel, soil and coal.
Semi Trailer Manufacturer says，Compared with ordinary semi-trailer, the use condition of self-dumping semi-trailer is more complex. If the product quality is not up to standard, it is easy to have problems, among which the cracking phenomenon is the majority.
The specific performance of dump truck cracking:
1. Weld cracking at the turning beam and web
In the process of using the dump semi trailer, the torque is relatively large, especially the lower wing plate. The torsion force acts on the flip beam through the inclined brace of the flip beam, resulting in great stress at the welding spot between the flip beam and the web, and the weld is easy to crack.
2, suspension rib plate cracking
Generally speaking, the arc Angle of the suspension rib plate of the self-discharging semi-trailer is small, so the stress is too concentrated. At the same time, due to the existence of the weight reduction hole, the strength of the cross-section of the plate rib plate is greatly reduced, so it is easy to break. Especially when the vehicle through complex road conditions, torsion occurs here, the web will appear cracks.
3. Suspension inclined brace and suspension large brace crack
The suspension is a large area of torsion, especially when the frame turns quickly, the lateral force of the tire will act on the frame through the axle, plate spring, suspension, etc., so the frame bears a larger moment, especially at the lower wing plate, more prone to torsion, causing the cracking of the internal and external support plate.
4. Suspension diagonal brace cracking
The suspension webs of some self-dumping semi-trailers are not reinforced by stiffened plates, and the inclined struts of the suspension are not welded with the connecting pipes. In the process of use, the suspension bears a great torque, and the stress of the inclined struts is too concentrated, leading to the cracking of the suspension inclined struts.
5. Flip beam reinforcement of subframe diagonal brace cracking
Generally, there are two reasons for the cracking of the inclined brace strengthened by the overturning beam of the subframe: the longitudinal beam of the overturning beam of the subframe is cross-butt with the overturning beam, and the strength is weak. When the vehicle is overturning and unloading, the overturning beam will be deformed; If the front and rear cylinders are not synchronized when the dump truck is unloading, the subframe is prone to torsion cracking.
As for the reason of the cracking of the dump truck, the main problem is whether the design is reasonable and the production technology is not up to the standard.
Some manufacturers manufacture dump trucks according to the design ideas of ordinary semi-trailers. In fact, in addition to considering the general bearing capacity, the design of dump semi-trailers should also comprehensively consider the stress situation of different parts of the body, frame, suspension and so on when the hydraulic support of dump lifts the goods. In addition, whether the material selection is standard, whether the weld is firm, whether the selection of each part is up to standard, and so on, are the key factors affecting the quality of vehicles.
So, when choosing a car, should from what aspects to make a choice?
The design should be reasonable and the lightweight should be appropriate. The chassis should be stable, and the center of gravity should be relatively low. Of course, it also needs to be combined with the load, the type of goods, the use of road conditions, driving habits and other system planning. Nowadays, the trend of lightweight trailer is prevailing, and the dump truck can also consider lightweight treatment from the aspects of material use. However, due to the particularity of the working condition of the dump truck, it must not blindly sacrifice strength to pursue lightweight.
Focus on the material selection of vehicles, steel can be divided into high-strength steel, manganese steel, ordinary steel, different kinds of steel can be divided into different models, such as high-strength steel can be divided into 700, 900, 980 and other models, its durable strength will gradually increase with the increase of the model, the body weight will gradually decline, of course, the cost will increase.
The production process should be passed. Nowadays, the production automation degree of large trailer factory is gradually popularized, such as welding, painting and other processes have realized automatic operation, and the processing quality has been improved to a certain extent. Sand blasting can not be less, paint spraying to uniform, electrophoretic coating of course better. Paint can also be divided into alkyd paint and polyurethane paint, the latter is more upscale.
The hydraulic lifting system should be stable, such as the oil circuit design should be reasonable, the cylinder lifting should be synchronized, and so on. After all, the hydraulic system is the power source of tipping and unloading of the dump truck, and the stable operation of the hydraulic system can ensure the normal process of unloading.