Green harmonics for the domestic harmonic reducer leader, the market share of 40%, while the production and sales of frameless torque motor and other mechanical and electrical integration products. In April 23, Green Harmonic and Sanhua Intelligent control signed a framework agreement, the two sides agreed to jointly establish a joint venture in Sanhua Mexico Industrial Park, Green Harmonic is expected to use Sanhua’s channels and customer advantages to accelerate the sea, with the potential to enter the humanoid robot supply chain. China Great Power De, Guomao shares and other enterprises in their respective reducer segments are also relatively leading. Among them, Zhongda has a complete product line, including RV, harmonic, precision planetary reducer, etc.; Guomao shares the strength of cycloidal pin wheel reducer, and its subsidiary Guomao precision has also entered the field of harmonic reducer.

(3) Lead screw: The planetary roller lead screw has reached a milestone

The main function of the lead screw is to convert the rotating motion into linear motion, which mainly includes sliding lead screw, roller lead screw, line star roller lead screw and other products. Sliding screw is sliding friction, simple structure but poor accuracy, transmission efficiency 25%-50%, mainly used in elevators, automobiles and other fields; Ball screw is rolling friction, high efficiency, high precision, high speed, but the price is high. The friction coefficient of rolling friction is much lower than that of sliding friction, and the transmission efficiency of ball screw is about 90%-99%; The planetary roller lead screw is arranged with 6-12 threaded rollers on the surrounding planet, the increase of the contact surface greatly improves the bearing capacity and rigidity, and the lead screw shaft is a non-circular thread with small lead Angle, which is conducive to achieving higher lead accuracy, and has the characteristics of high bearing capacity, impact resistance, high precision, small volume and so on. Because of its small volume space use, efficient and accurate large thrust output, as well as durable and stable performance characteristics, planetary roller screw is being more and more widely used in the industrial field, the ball screw, hydraulic drive and other technical routes to form an effective alternative. Applications in robotics, automation, CNC machine tools, medical devices, automobiles, oil and gas and other fields are gradually becoming popular.

GDD360C 3BHE047217R0101

GDD360C 3BHE047217R0101

The humanoid robot linear actuator uses reverse planetary roller screw, which is mainly used for small and medium load, small stroke and high speed application scenarios. The reverse planetary roller screw structure is similar to the standard type, except that it has no inner tooth ring, both ends of the lead screw are processed with straight teeth meshing with the gears at both ends of the roller, and the nut as an active part, its length is much larger than the standard type. Under normal circumstances, unlike the standard roller screw, the nut of the reverse planetary roller screw is the active part, the lead screw is the output component, and there is no relative axial displacement between the roller and the lead screw, which is mainly used for small and medium-sized load, small stroke and high-speed application scenarios. The biggest advantage is that the nut can be used as the motor rotor to realize the integrated design of the motor and the lead screw. Form a compact electromechanical actuator.

The overseas is highly monopolized, and the domestic is in the initial stage. Planetary roller screw manufacturing barriers are very high, most of the overseas enterprises around 1950 in the field of national defense and military industry to start product research and development, the main enterprises include Sweden SKF, Switzerland Schaeffler, the United States Moog, the United States Exlar, etc. The product gap at home and abroad in the planetary roller screw is mainly for manufacturing materials (hardness, corrosion resistance, machinability, etc.) and manufacturing capacity (including machine tools, processes, etc.). Most of the local players are non-listed companies, gradually emerging, including China Ship 704 Institute, Bote Seiko, Sirui transmission, Zhongfu Machinery, etc., and its planetary roller screw has been gradually applied in various fields such as valves, petrochemical, military, and industrial. The development and production of micro-planetary roller screw has reached a milestone and has development potential. Dingzhi technology is deeply engaged in the field of linear transmission, its linear transmission products include sliding screw, rolling screw, planetary roller screw. The application scenarios, life and transmission efficiency of the three types of screw are different, and there is a certain synergy in technology and process, etc. The precision, stability, service life and customization of Dingzhi linear transmission products are at the leading level in the industry. In the field of micro planetary roller screw, the company has achieved milestone progress, such products in the application field including robots, aircraft landing gear, some industrial scenarios, etc.

(4) Sensors: Global competition is concentrated, and the development of local enterprises has a long way to go

The robot needs multiple sensors to ensure sensitivity. Various sensors are equivalent to the hands, eyes, ears and nose of industrial robots, helping to identify their own motion state and environmental conditions. With the help of this information, the controller can issue corresponding instructions to make the robot complete the required actions. According to the different detection objects, it can be divided into internal sensors and external sensors. Internal sensors are generally used to detect the state of the robot itself, including position, speed, force sensors, etc. External sensors are generally used to detect the environment of the robot, including distance, tactile, auditory, and visual sensors.