The most significant distinction between the truck-mounted crane and the truck crane lies in the fact that thetruck-mounted crane is equipped with a cargo box and possesses both lifting and transportation capabilities, whereas the truck crane lacks a cargo box and solely has the lifting function. Currently, the cargo box of thetruck-mounted crane is predominantly manufactured through the cold riveting process. So, precisely what are the advantages offered by this manufacturing process?
Facilitates maintenance. Riveted structures have a lower propensity for deformation compared to welded ones.
Let’s delve deeper into this aspect. Welded joints are prone to residual stresses and heat-affected zones, which can make the structure more susceptible to distortion over time. In contrast, rivets distribute the load more evenly across the connection, reducing the risk of localized deformations. This characteristic is particularly valuable when it comes to maintaining the integrity and functionality of the cargo box, as it ensures a more consistent and reliable structure over the long term.
Under load conditions, the riveted structure exhibits superior fatigue strength in comparison to the welded structure. The tensile strength of the riveted cargo box of the truck-mounted crane is significantly greater than that of the welded counterpart.
When subjected to repeated loading and unloading cycles, the riveted connections can better withstand the resulting stress fluctuations. The mechanical interlocking provided by the rivets helps to distribute the stress more evenly, reducing the concentration points that can lead to fatigue cracking in welded joints. This enhanced fatigue resistance is crucial for the cargo box, which often experiences varying loads during its operational life.
Given that the cargo box of the truck-mounted crane is tasked with carrying goods and thereby has relatively high strength requirements, especially for the bottom plate, the adoption of the riveting method becomes necessary. If welding is employed, there is a high likelihood of cracks emerging at the weld seams and potential fractures occurring.
The bottom plate of the cargo box bears the brunt of the load from the contents. Welded seams in this area are more prone to stress concentrations and heat-affected weakening, increasing the risk of failure. Rivets, on the other hand, provide a more uniform load distribution and connection integrity, ensuring the bottom plate can withstand the heavy loads without compromising its structural integrity.
Another notable advantage of riveting is that in cases of subpar quality of the cargo box, there will be distinct and obvious warnings. Examples include loose rivets, water leakage at the seams, and so forth. In contrast, if there are minute cracks within the welded cargo box, their detection from the exterior is an extremely challenging task. However, these seemingly insignificant cracks have a high probability of expanding during prolonged usage, presenting a substantial hidden danger to driving safety.
Loose rivets or seam leaks are easily identifiable indicators that prompt timely maintenance and rectification. The hidden nature of cracks in welded structures, however, can lead to undetected deterioration until a critical failure occurs, potentially endangering the vehicle and its occupants.
The reason behind the riveting of the girders and sub-beams of the carriage of the truck-mounted crane is that the driving environment of the truck-mounted crane is not perpetually on smooth and even roads. When traversing uneven terrains, the leaf springs of the vehicle might occasionally fail to accommodate the changes and distortions of the vehicle body. In such cases, a riveted frame can twist in tandem with the body and subsequently return to its original state. Welded frames, on the other hand, lack this flexibility and cannot recover from such distortions. When the truck-mounted crane navigates through bumpy roads, the occasional emission of certain sounds is attributed to the deformation and restoration of the frame. Once the frame and the carriage are riveted, they acquire specific rigidity and plasticity to effectively resist deformation.
The ability of the riveted frame to adapt to the dynamic stresses and strains encountered during off-road or uneven driving conditions is a crucial factor in ensuring the longevity and durability of the vehicle. The combination of rigidity and plasticity allows for a certain degree of flexibility without sacrificing the overall structural stability.
The final point to consider is that the traditional welding method is prone to various quality defects such as false welding, missed welding, and unstable welding. To circumvent these quality deficiencies, the approach of increasing the number of welding spots to guarantee the requisite strength is often adopted. However, this not only adds to the vehicle’s weight but also introduces challenges. Additionally, welding is a thermal connection process, during which component distortions and other issues are frequently encountered, rendering the processing procedure less controllable.
The increased weight resulting from additional welding spots can have implications for the vehicle’s fuel efficiency and overall performance. The thermal nature of welding can cause localized heating and subsequent distortions, making it difficult to achieve precise and consistent welds. This lack of control can lead to inconsistent quality and potential weak points in the structure.
In summary, the cold riveting connection employed in the manufacturing of the cargo box of the truck-mounted crane offers several distinct advantages, including reliability, reduced likelihood of loosening, superior meshing at the connection points, exceptional torsional resistance, and robust load-bearing capacity. These attributes collectively contribute to a more durable and structurally sound cargo box, capable of withstanding the rigors of diverse operating conditions and ensuring the safe and efficient transportation of goods.
By opting for the cold riveting process, manufacturers can enhance the quality and performance of the truck-mounted crane‘s cargo box, providing a more reliable and long-lasting solution for the demanding requirements of the transportation and lifting industry.
