Shantui EE75: A Benchmark for 7-ton Pure Electric Excavators, Dual Breakthroughs in Mechanical Precision and Zero-Carbon Efficiency
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In the small pure electric excavator market, the Shantui EE75 has become the core equipment for municipal construction, plant renovation, greenhouse operations and other scenarios with its mature three-electric system, strong operation performance and fully optimized mechanical configuration. As the core model of Shantui's layout in the field of pure electric construction machinery, it takes "zero emission, low noise, high efficiency and energy saving" as its core advantages, and achieves precise adjustment on key mechanical components such as the three-electric system, hydraulic control, chassis structure and working device. It not only inherits the durability gene of Shantui's products, but also highlights the technological innovation of pure electric models, redefining the mechanical performance and environmental protection standards of 7-ton small excavators.
The three-electric system is the core power center of the Shantui EE75 and the core mechanical highlight that distinguishes it from traditional fuel-powered models. The machine is equipped with an industry-leading integrated three-electric system, adopting a high-efficiency permanent magnet synchronous motor with a rated power of 44kW/2000rpm. The power output is stable and responsive. Compared with fuel-powered models of the same tonnage, the power transmission efficiency is increased to more than 90%, completely getting rid of the troubles of engine noise and exhaust pollution. The overall operation noise is less than 66 decibels, which is suitable for closed operation scenarios with strict environmental requirements . The motor adopts waterproof and dustproof design, with a protection level reaching the industry's high standard, which can adapt to complex construction environments with humidity and dust, and greatly improve the stability of use.
In terms of the energy storage system, the Shantui EE75 is equipped with a 114kWh high-performance lithium battery, adopting a modular design with reasonable layout and convenient disassembly and assembly, which can meet the demand of 5-6 hours of continuous operation, fully adapting to the daily operation rhythm of small and medium-sized projects; it also supports dual modes of DC fast charging and AC emergency charging. DC fast charging can complete fast energy supplement in 1.5 hours, and 6.6kW AC charging can meet the demand of slow charging at night, solving the range anxiety of pure electric models. The vehicle-level integrated controller has high integration and stable operation, which can realize precise coordinated control of the motor, battery and hydraulic system, adjust power output in real time, balance operation efficiency and energy consumption control. The hourly operation cost is 23 yuan lower than that of the same type of fuel engine, and the annual operation cost can be saved by about 46,000 yuan .
As the "transmission core" of pure electric excavators, the hydraulic system directly determines the operation precision and fluency. The Shantui EE75 is equipped with an independent high-end load-sensitive hydraulic system, adopting an electronically controlled variable displacement pump design, which can accurately distribute hydraulic flow and pressure according to the operation load demand, with small energy loss and excellent coordination of compound actions, smooth operation without jamming, and greatly improved fine operation capability [7][9]. The rated working pressure of the hydraulic system has been optimized and adjusted, combined with reinforced hydraulic pipelines and low-resistance joints, effectively reducing pressure loss and improving energy utilization efficiency; it is standard equipped with high-quality hydraulic oil, combined with a dedicated filter, which can effectively prevent impurity intrusion, avoid wear of hydraulic components, and extend the service life of the hydraulic system.
The chassis and working device highlight the durability and operation strength of the Shantui EE75. The total operating weight of the whole machine is 7800kg, and the body structure is compact and reasonable, suitable for operation in narrow spaces [7]. The working device adopts a reinforced design, comprehensively optimizes the layout of structural parts, and the key stress positions are strengthened to cope with harsh working conditions; the standard bucket capacity is 0.32m³, and the bottom plate, side plates and reinforcing plates are all made of high-strength wear-resistant materials. The optimized bucket structure can reduce excavation resistance, improve excavation efficiency, and extend the service life of the bucket. The bucket digging force and arm digging force are comparable to those of fuel-powered models of the same tonnage, meeting the excavation needs of various materials [6][9].
The mechanical optimization of control and safety further improves the operation experience and reliability of the Shantui EE75. The cab adopts a frame-type protective structure with high strength and strong impact resistance, which can effectively ensure the safety of operators; the interior is equipped with a suspended seat and a high-power heating and cooling air conditioner. The all-injection interior is designed in line with ergonomics, which is not easy to cause visual fatigue and greatly reduces the fatigue of long-term operation [8][10]. The cab is standard equipped with a 7-inch touch color screen, integrating functions such as equipment operation parameters, battery status and maintenance reminders, real-time monitoring of the machine operation status, and is also equipped with a high-definition rear-view camera to improve operation safety; the high-voltage system has a protection level of IP65, with multiple safety protection functions such as start-stop and high-voltage on-off, comprehensively ensuring personal and equipment safety .
Every mechanical design of the Shantui EE75 takes into account efficiency, durability and environmental protection. From the precisely coordinated three-electric system, to the smooth and efficient hydraulic control, and then to the reinforced and durable chassis and working device, each component has been carefully adjusted. With the advantages of zero emission and low energy consumption, it adapts to the demand of green construction, and meets the needs of complex operation scenarios with strong mechanical performance, becoming a performance benchmark in the 7-ton pure electric excavator market. It not only highlights Shantui's profound accumulation in the field of construction machinery, but also provides a reliable mechanical solution for the electrification upgrade of small excavators.
The chassis adopts an H-type crawler frame with strong load-bearing capacity and reasonable load distribution of the whole machine; it is equipped with the four-wheel-one-track independently developed by Shantui. Relying on 40 years of R&D and manufacturing experience, it adopts top forging and heat treatment technology, with stable and reliable quality, which can effectively resist impact and wear during operation [6][8]. The crawler adopts anti-skid design with moderate ground pressure, which can adapt to operation in soft ground and avoid sinking; the travel speed is divided into high and low gears, adapting to the movement needs of different operation scenarios. The travel motor adopts a large torque design with strong traction force, the maximum climbing capacity is 70% (35°), and the stability is excellent during steep slope operation.