We support the transformation and upgrading of China’s construction vehicle manufacturing industry and facilitate resource sharing along the extended supply chain for materials and processing in the manufacturing sector. 我们服务于国内工程车辆制造水平的转型升级，在制造业用材与加工延伸的供应链路上资源共享。

Today, I’d like to talk about dump trucks in China’s commercial vehicle market. Over the past two years, the dump trucks you see on the road have shifted from having boxy cargo beds to U-shaped ones. So let’s take a closer look at these U-shaped dump trucks!

今天和大家说说国内商用车市场中的自卸车，最近两年大家在路上看到的自卸车由原来方方正正的车箱，变化成了U型车箱了，那我们来讲讲今天这个U型自卸车吧！

What Are the Advantages of a U-Shaped Dump Truck?

1. Cleaner Unloading

The reduced weight allows for more thorough unloading. The U-shaped body has no blind spots at the corners, so cargo is less likely to stick to the sides during unloading, resulting in a cleaner unloading process.

U型自卸有什么优点

1、卸货更干净

自重降低卸货更彻底，U型货箱的边角不存在死角，在卸货时不容易粘箱，卸货更干净。

2. Lightweight

Traditionally, the cargo bodies of standard dump trucks were reinforced with thicker steel to enhance strength. In contrast, U-shaped cargo bodies achieve weight reduction through structural optimization. Today’s most common U-shaped dump trucks utilize high-strength or wear-resistant steel plates. While maintaining the body’s structural integrity, the plate thickness is reduced by approximately 20%, resulting in a weight reduction of about 1 ton. This effectively improves the load-carrying capacity utilization ratio.

2、自重轻

我们原来常见的田字格自卸车货箱都是通过加厚钢材来提高强度，U型货箱通过结构优化，减轻了自重。现在最常见的U型自卸都是采用高强板或耐磨板，在保证厢体强度的前提下，板材厚度降低约20%，车厢自重减轻1吨左右，有效提高了载质量利用系数。

3. High Load-Carrying Capacity

Constructed from high-strength steel plates or wear-resistant plates, these bodies feature high yield strength and superior impact and fatigue resistance. For users transporting ore, this helps minimize damage to the cargo box caused by ore particles.

4. Low Center of Gravity

The U-shaped structure provides a lower center of gravity, resulting in a smoother ride—especially when cornering—and helping to prevent cargo spillage.

3、承载能力强

采用高强度钢板或耐磨板，屈服强度高，抗冲击性和抗疲劳性更好。对于矿石运输的用户而言，可减少矿石头对货箱的伤害。

4、重心低

U型结构重心更低，这样行驶更加平稳，尤其是在过弯时，避免了出现货物洒落。

5. Extend Tire Life

U-shaped cargo boxes keep the load centered, distributing the load more evenly across both tires, which helps extend tire life.

So why haven’t U-shaped cargo boxes gained widespread adoption in China?

1. High manufacturing requirements and higher production costs

U-shaped cargo boxes require a single-step molding process, which demands greater investment from manufacturers in terms of production costs. Since U-shaped cargo boxes have not yet gained widespread market acceptance, many manufacturers are reluctant to proactively invest in such equipment.

5、省轮胎

U型货箱可以保持货物居中，两侧轮胎的受力比较均匀，这样有利于提高轮胎寿命。

原来为什么U型货箱在国内得不到广泛推广呢？

1、制造工艺要求高，需要更多成本投入

U型货箱需要一次成型，在制造成本上需要厂家投入更多。U型货箱还没有被市场广泛认可的情况下，很多厂家也不愿意主动投入这样的设备。

2. Due to cost considerations, ordinary users are reluctant to accept them

Rising manufacturing costs have led to higher retail prices, making it more difficult for ordinary users to accept them.

3. Lower cargo capacity

U-shaped cargo boxes have a smaller cross-sectional area, resulting in lower cargo capacity. Based on calculations for a 5.6-meter cargo box, a U-shaped box holds approximately 0.5 cubic meters less than a grid-pattern box. However, since many grid-pattern boxes now feature internal angled designs, and U-shaped boxes have a lower center of gravity, this difference is not particularly noticeable.

2、价格原因，普通用户不愿意接受

制造成本的升高也带来了销售价格的提高，普通用户在接受起来也会更加困难。

3、装载量小

U型货箱的截面积会小一些，在装载量上会少一些，按5.6米的货箱装载量测算U型车箱比田字格车箱少0.5个立方左右。不过因为现在很多田字格方箱内部也有斜角设计，再加上U型货箱重心更低，这个差别并不明显。

4. Difficulty in Calculating Volume

Furthermore, U-shaped cross-sections are less convenient than square boxes when calculating volume. Since freight charges for transporting sand or soil are often based on the volume of earth moved, this presents a certain degree of inconvenience.

5. Overloading Is the Biggest Obstacle to Adoption

Given that overloading was virtually the norm in the domestic transport market, users believed that the more they hauled, the more they earned. The load capacity of a vehicle became a key criterion for users when selecting a truck, making the heavy, grid-patterned square body the most popular option on the market due to its excellent load-bearing capacity and impact resistance.

If overloading is avoided, the U-shaped body leverages its lightweight advantage to carry more cargo and improve economic efficiency. The selling point of U-shaped dump trucks lies in their lightweight design; by using high-strength steel plates, they weigh 1 ton less than those made with ordinary steel plates.

With increasingly strict regulations on truck overloading, the weight advantage of U-shaped cargo boxes is becoming increasingly evident. As the domestic truck market matures, U-shaped cargo boxes are emerging as a trend, and we will see more of these dump trucks traversing the vast landscapes of China.

4、统计立方不方便

而且U型截面在计算体积时不如方箱方便，很多拉沙或者土的是按照所拉的土方体积来计算运费，这也带来了一定的不便。

5、超载是影响推广的最大原因

由于原来国内运输市场的整体环境是几乎没有不超载的，对于用户来说，拉得越多，才会挣得越多。一辆车能拉多少成为了用户选择车辆的一个重要标准，厚重的田字格方箱也就是市场上最受欢迎的货箱了，它的承载能力以及抗冲击力都很好。

如果不超载，U型货箱发挥自重轻的优势，能够多装载货物，提高经济效益，U型自卸产品的卖点定在轻量化，采用高强钢板后重量比普通钢板要轻1吨。

对于目前自卸车超载的治理越来越严格，U型货箱在自重方面的优势得以体现。国内的卡车市场逐渐成熟，U型货箱成为一种趋势，我们会看到更多这一类型的自卸车驰骋在中国大地上。

JULONG STEEL is a specialist in manufacturing services, dedicated to supporting the transformation and upgrading of China’s engineering vehicle manufacturing sector and facilitating resource sharing along the extended supply chain for manufacturing materials and processing. Julong Steel operates a 12-meter, 4,000-ton large-scale CNC press brake developed in-house. Equipped with a Dutch Delem CNC system to ensure machining precision, the company provides specialized solutions for sheet metal processing and undertakes cold-forming of various custom-shaped steel plates. These services are primarily used for the fabrication of body panels and subframes for various types of engineering dump trucks, meeting the requirements of lightweight design.

居龙钢铁是制造业服务专家，服务于国内工程车辆制造水平的转型升级，在制造业用材与加工延伸的供应链路上资源共享。居龙钢铁拥有自主研制的12米4000吨大型数控折弯机，采用荷兰delem数控系统保证加工精度，为金属板材加工提供更加专业的解决方案，承接各种异型钢板的冷弯加工。主要用于各类工程自卸车箱板、副车架加工，以满足轻量化设计。

我们在这里恭候您的光临，愿与广大致力于中国商用车转型升级的同路人一同前行。