The recent military parade held in Zhu Rihe and the release of "Wolf Warrior 2" have captured global attention. China has demonstrated to the world what it means to be a "Chinese power." While it has yet to engage in actual combat, the progress in its military capabilities has been recognized worldwide. The advancements in both land and naval forces have been thoroughly showcased. In terms of air deployment, the official entry of the J-20 fighter aircraft into service this year marks a significant milestone. In response to evolving military scenarios, the development of advanced long-range strategic bombers and the integration of trinity military forces are now on the horizon.
The "novelty" of the new bomber lies primarily in its unique launch structure. A key indicator is the number of hanging points, which must allow for rapid reloading while ensuring safety and reliability. During the design process, the fighter development team deliberated extensively and revised plans multiple times. However, reliability remained a challenge. Recognizing the North Union's expertise in high-precision equipment customization within the military industry, the development team sought their assistance. Following an intensive technical conference, the North Steel Technical Team proposed a creative solution: employing high-precision angles to automatically compensate for the reliability of the CSLR. This breakthrough effectively addressed issues that had perplexed military experts and successfully applied the innovation to the new strategic bomber.
The core technical parameter of the rotary mechanism engineering prototype focuses on angular rotation positioning accuracy. This device serves to verify functionality: whether the rotary mechanical structure meets actual launch requirements, and whether the software control system can effectively manage the device. Testing involves both mechanical and electrical aspects. The rotary roller operates in two directions, with an angular error of ≤±3arc.min after every 60° rotation. Achieving such precision is crucial, as deviations could jeopardize operational success in real-world combat scenarios.
The servomotors and speed reducers used in the drive mechanism are custom-designed units with specialized functions. Their performance has been validated, yet the gear backlash of the reducer presents an issue, measuring 7arc.min. When the steering mechanism shifts, this backlash becomes a critical factor influencing rotational positioning errors. Even if the rotational error of other transmission mechanisms is zero, meeting the required rotational positioning accuracy remains unattainable. To enhance the rotational positioning accuracy of the drive mechanism, developing a reducer with reduced backlash is essential. However, such research and development is costly, time-consuming, and challenging to achieve.
The drive mechanism comprises a servomotor, reducer, connecting flange, rotary transformer, slewing bearing adapter plate, slewing bearing, adapter plate shaft, electric push rod, pin shaft guide, and more. The expert team programs the PLC, servomotor, reducer, resolver, and other components to create a closed-loop control system. The PLC sends a pulse signal to direct the motor, driving the reducer to rotate by 60°. The reducer’s output shaft ensures precise rotational alignment via a key and adapter shaft. The adapter shaft is fixed to the resolver’s rotor and ultimately feeds back the angle to the PLC. Closed-loop control is executed by correcting the drive control, allowing the system to maintain a rotation angle of ≤60° ±3arc.min.
When the rotation direction changes, the PLC halts the motor at 60°, activating the electric push rod to move the positioning pin shaft forward within the pin axis guide. The pin shaft then inserts itself into the positioning hole in the adapter plate shaft. The positioning pin shaft features a chamfered front end, functioning as a taper guide to ensure accurate insertion despite a 7 arc.min reducer backlash. After inserting the pin shaft’s minimum chamfered end, the thrust of the driving mechanism is counteracted by the electric push rod, automatically correcting the rotating shaft disk. The angular accuracy post-alignment depends on the indexing accuracy, the inner diameter of the positioning hole in the rotating disk shaft, and tolerances, all of which are guaranteed by machining. Thus, the angular accuracy after rotation satisfies ≤±3 arc.min.
Addressing military demands swiftly and cost-effectively is particularly challenging. At first glance, this seems impossible. After thorough deliberation, the team adjusted their approach: since reducing the reducer’s backlash is unfeasible, they aimed to minimize its impact on angular positioning. When the swing mechanism initially starts and rotates in one direction, the reducer’s backlash does not affect angular accuracy. Only during directional changes does the backlash introduce a maximum 7arc.min error. This discrepancy is automatically corrected by mechanical mechanisms and external forces. Without altering the reducer model or imposing stricter backlash conditions, blind research into low-backlash, high-precision reducers was avoided. Instead, a set of mechanical positioning pins was added. The forced positioning of these pins achieves an angular rotation accuracy of ≤±3arc.min at minimal cost. The gyroscope developed by the North Steel Union provided invaluable ground testing data for the new strategic bomber.
Once the strategic rotary launcher is officially deployed, it will enhance fighter aircraft flexibility, reduce costs, and improve rapid response capabilities. Unlike traditional external weapon structures, this launcher can accommodate different types of armaments without altering the frame, significantly meeting complex mission requirements. In the future, this launcher structure will also be adopted by the army and navy, amplifying combat effectiveness exponentially.
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