Shanghai Jintai SX40 two-wheel milling: multidimensional technological innovation

“By focusing on the Chinese home market, exploring two-wheel milling products that are economical, practical, complete, and low-cost in operation, the two-way switching of the SG hydraulic grab function with Kim Tae's superior product can be achieved quickly, which is the basic orientation of the SX40.” Lin Jian, general manager of Shanghai Jintai, said. Based on this concept of development, Shanghai Jintai's two-wheel milling R&D does not copy the technical route of foreign products. Instead, it proceeds from the reality of China's basic construction market and boldly innovates in various dimensions. It eventually formed a unique Jintai double-wheeled wheel. Milling.

Dimension One: SX40 two-wheel milling and SG60 hydraulic grapple adopt the same host platform, combining the two functions of catching groove and milling groove in the modular design, achieving “one machine for dual use”, full body cash Thai double wheel milling Practical and economical.

Shanghai Jintai SX40 two-wheel milling

Dimension Two: The SX40 adopts diesel and electric power combination energy. Under the premise of fully satisfying the power required for the overall operation of the two-wheel milling machine, the SX40 sets the energy saving modes of the two power outputs, working state and non-working state. The 300kw diesel power of the SX40 dual-cylinder milling machine is used for the power required for the milling work. In addition, the 155kw power pumping station system is configured. The frame correction and other actions are powered by this system. The two systems are independently controlled and can achieve energy-saving modes under both working and non-operating conditions.

Xujiahui Center Project SX40 Construction Site

Dimension 3: SX40-A double wheel milling adopts gas lift and reverse circulation for slagging. Compared to the imported "pump lift" slag removal method, "gas lift" has its own advantages:

(1) Low power consumption and simple equipment. Only need to configure the corresponding power of air compressor and ordinary material slagging pipe, mud pipe, you can realize the remote transportation of slag and mud is handled; after actual test, the power consumption is less than 50 kilowatts in the depth of 70 meters, about pump One-third of the move.

(2) Low material and maintenance costs. The gas lifting and slag removal system has no wearing parts and the maintenance cost is almost zero. Pumping methods include mechanical seals, impeller wear, and high maintenance costs. At the same time, the slag and slurry pipes of the gas lift method are ordinary steel pipes and hoses, and the procurement and maintenance costs are low;

(3) Slag removal by gas lift, the deeper the groove depth, the better the effect of gas lift and slag removal;

(4) The slag suction port and slag discharge pipe have a large diameter, the slag suction port is 110mm (pump lift is 75mm), and the pipe diameter is 200mm (pump lift slagging pipe is 150mm), which is 1.7 times of the slag amount of the pump. Large particle size slags have a stronger ability to pass, especially in the condition of pebble strata, large-diameter pebbles can be directly discharged without repeated crushing;

(5) The SX40 slag discharge pipe is designed at the center of the frame body, and the oil pipes and lifting points are symmetrically distributed, and the forces are balanced to ensure the verticality of the milling groove.

(6) SX40 uses a retractable slagging pipe to reduce the frequency of slag tapping. The time for connecting a slag tapping pipe is about 2 minutes, and the labor intensity is low and the connection efficiency is high.

SX40 slag discharge system at Xujiahui Center

Dimension 4: Accurate control of the milling wheel micro feed system. When the milling cutter cuts the rock formation, if the feeding scale is not well controlled, it will easily cause the milling wheel to idle or jam and affect the efficiency of the footage. The SX40 micro feed system can precisely control the accuracy of the milling wheel's footage.

Dimension 5: Select the appropriate mud treatment device according to different working conditions. In order to better match the structural features and working performance of the SX40, two types of sand removal systems—ZR300 and ZR500—were simultaneously developed during the improvement and improvement of the two-wheel milling. ZR300 is suitable for small work environment in the work site and can be arranged near the slot to achieve close separation of mud and sand. The layout is simple, operation is convenient, materials are saved and manpower is reduced. The ZR500 is suitable for a large work site and requires an integrated construction layout for long-distance transportation of mud and slag.

SX40&ZR300 construction site on the Guangzhou Metro Line 11 Zhongshan Ba ​​Road Station

Dimension 6: "Two kinds of power, three kinds of structure" - SX40 series development. After the performance and efficiency of the SX40-A double wheel milling have been stabilized, Shanghai Jintai has developed a more economical and practical suspended B-type double wheel milling and C-type double wheel milling with full electrohydraulic power, forming diesel power and Electro-hydraulic power two kinds of host platforms and three mechanical structure series of products.

Shanghai Jintai SX40 two-wheel milling: multidimensional technological innovation

Dimension 7: 12 push plate correction system to ensure the verticality of the milling slot. A total of 12 deflection correction push plates are arranged in the frame body, and the 4 lateral blocks can be individually operated. The front and rear 8 blocks can be linked in pairs. When the groove is skewed, the working posture of the frame is adjusted by the correction system, and the angle sensor will be used. The measurement data is sent to the monitor for precise correction.

Dimension 8: Perfect combination of SX40 two-wheel milling and SG hydraulic grapple, creating a unique combination of “gripping and milling”. In order to greatly increase the construction efficiency and reduce the consumption of the two-wheel mill, and adapt it to the gas lift reverse circulation slag removal method, the SX40 adopts the “gripping and milling combined” construction process in the actual construction, and the soft ground layer is grabbed directly by the grab. Grooves, the perfect combination of the SX40 slot and the hard rock relay slot, the Jintai SG grab and the SX40 two-wheel milling create a unique “gripper-milling” process.

SX40&SG at Xujiahui Center Project Site

Dimension nine: a number of patented technologies lead the trend of localization. During the development of the SX40 dual wheel milling, a number of patented technologies and special devices matched to the SX40 have been produced: such as milling wheel sealing technology, blind area milling technology, micro-feeding technology, slag tube fixing device, slag tube box and pulley device The slot guides used in the construction of the second-phase tanks all reflect the wisdom of the Jintai people.

After six years of bold innovation and unremitting efforts, Shanghai Jintai New SX40 two-wheel milling has completed its own transformation. As of press time, in addition to the Shanghai "Xujiahui Center" project, multiple SX40 also in Guangzhou, Hangzhou, Nanjing and other markets Show their skills. SX40 is setting a new benchmark for domestic two-wheel milling into the domestic mainstream application market! (This article comes from Shanghai Jintai)