In shipyards, various types of outdoor cranes are utilized to construct large vessels using the block assembly method. The total number of outdoor cranes in domestic shipyards is estimated to be close to 1,000 units. To prevent potential accidents caused by strong winds or other external forces when cranes are in an idle state, safety locking devices must be installed on the lower rail of each crane to prevent unintended movement. Currently, most shipyards employ hydraulic safety locking devices. However, these systems have several drawbacks, including oil leakage, difficulties in power supply maintenance, and the inability to visually confirm the exact locking condition between the device and the rail. To address these issues, this study proposes a new type of motor-driven safety locking device. The design was validated through structural safety evaluation based on finite element analysis(FEA), followed by prototype fabrication and operational testing. The test results confirmed that the developed system met key performance criteria such as operation time, clamping force, and safety factor. The application of the proposed safety device is expected to enhance the operational safety of crane systems and reduce the workload of operators, thereby contributing to a safer working environment in shipyards.

Abstract
1. 서 론
2. 모터 구동식 안전장치 개념 설계
3. 안전장치 구조해석
    3.1 유한요소 모델 및 해석 조건
    3.2 안전장치 구조해석 결과
4. 안전장치 시제품 제작 및 성능 시험
    4.1 시제품 제작 및 구동 테스트
    4.2 시제품 성능 시험
5. 결 론
References

• 유현수(Dept. of Smart Ocean Mobility Engineering, Changwon National Universitysity) | Hyun-Su Ryu (Dept. of Smart Ocean Mobility Engineering, Changwon National University)
• 강성욱(Dept. of Smart Ocean Mobility Engineering, Changwon National University) | Sungwook Kang Corresponding author