Scissor lifts are widely used in industry. The selection of a configuration of lift table system plays an important role since this depends on the working requirements of the systems and also the type of lift object. In this paper, based on the parametric dimension technique, the mathematical model of the configuration and the load calculation for the double-stage scissor lifts, which depends on the design parameters, were investigated in order to enhance the operation of scissor lift systems (e.g., lifting height, loading, and stability). A 2D-model of the system was constructed and simulated in the Working Model software to verify the accuracy of the proposed method. The results obtained from the simulation indicate that by adjusting the mounting positions of cylinders, the elevation of the platform and reactions on joints of the components can be calculated, which assists in improving the performance of the system. Furthermore, the results also prove the practical significance in the calculating process and dimensional design of scissor lifts, especially for double-stage structures.

Although having a development history of over 200 years, researches and developments about press machines are still draw interest of modern mechanical engineering. This paper introduces a new press structure that utilizes a double crank mechanism to enhance productivity and efficiency for the stamping process. By adjusting the positions between the component links, the dynamic characteristic of the ram can be modified, optimizing the performance and improving operations of the system. The proposed design also allows for easy adjustments to adapt with different production requirements, such as changing forging and stamping speeds (fast and slow) to avoid the impact of springback properties in sheet metal. The kinematics of the structure have also been determined by mathematic equations, demonstrating significant improvements in the operation of the ram. Results from the research offers a promising solution to enhance production efficiency and enable the creation of simple yet capable mechanisms to perform complex operation.

Scissor lifts are special devices for transporting or lifting with a wide range of applications. By extending or retracting the hydraulic cylinder arranged in the scissor frame, the system can raise or lower the platform to the designated height. This study was conducted to analyze the relationship between the configuration of the cylinder and the movement of the platform in single-stage scissor lifts. By applying a numerical method and assigning parameters for the cylinder arrangement, the displacement of the platform and the forces in the cylinder can be easily calculated. The results obtained from the calculation process show the practicality of the proposed method in determining the optimal configuration for designing single-stage scissor lift systems.

Scissor lifts are widely used equipment across various industries. Due to their simple structure and ease of operation, selecting the appropriate configuration for manufacturing to meet specific operational requirements remains a design challenge. This paper introduces a parametric approach using the vector-loop method to establish the relationship between the elevation of platforms and the placement of cylinders in single-stage scissor lift systems. Based on this relationship, precise control of platform movement can be achieved, enhancing system stability. Furthermore, the study investigates the effects of external loads and cylinder placement on the resulting thrust force, offering valuable insights for selecting optimal installation parameters. The accuracy of the proposed method is validated through comparisons with 2D geometric models constructed in GeoGebra and simulations performed in Working Model software, demonstrating the method's effectiveness in optimizing scissor lift design and configuration. The results of this study can be compiled into a technical reference, assisting designers in selecting suitable cylinder arrangements and components to meet specific system requirements.

Do cấu trúc đơn giản và dễ chế tạo, các cơ cấu nâng dạng cắt kéo được sử dụng rộng rãi trong nhiều lĩnh vực công nghiệp và vẫn đang thu hút sự quan tâm của các nhà nghiên cứu trên thế giới. Nghiên cứu này khảo sát ảnh hưởng của việc bố trí xi lanh lệch trục đến tính chất làm việc của sàn nâng cắt kéo một tầng. Một mô hình toán học đã được phát triển để phân tích động học và đặc tính lực cho cơ cấu sử dụng một cấu hình xi lanh cụ thể, tập trung vào chiều cao nâng và mối quan hệ giữa tải trọng nâng và lực đẩy xi lanh tương ứng. Kết quả mô phỏng trên phần mềm Working Model xác minh tính chính xác của phương pháp đề xuất và chỉ ra rằng ngay cả những thay đổi nhỏ trong vị trí lắp đặt xi lanh cũng có ảnh hưởng đáng kể đến độ dịch chuyển của sàn nâng và lực đẩy của xi lanh. Những kết quả này không chỉ nhấn mạnh tầm quan trọng của việc bố trí xi lanh và cung cấp hướng dẫn thực tiễn để cải thiện hiệu suất và độ tin cậy của cơ cấu nâng kiểu cắt kéo một tầng.