Scissor Lift Research Articles

Application of a numerical method in analyzing the operation of single-stage scissor lifts

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.

Shape-performance coupled digital twin based on heterogeneous data from multiple sources: a scissor lift platform example

Shape-performance coupled digital twin based on heterogeneous data from multiple sources: a scissor lift platform example

Reducción del Sobrepico de un Elevador de tijeras Mediante Observador de Estado, LQR y LQG

Scissor lifts are crucial in various industries, known for their robust design and ability to lift heavy loads to significant heights. Their interlinked scissor mechanism allows controlled elevation and descent of the work platform. Precision and safety in their operation are essential to prevent accidents and ensure efficiency. A critical issue is the "overshoot," where the lift exceeds the desired height before stabilizing, causing instability and safety risks. This phenomenon is related to the system's dynamics and control, which typically employ hydraulic or electric systems to regulate the extension and retraction of the scissors. Precision in these systems is vital to stop the platform at the correct height smoothly and accurately. This paper presents a solution based on MATLAB/Simulink to improve the overshoot in scissor lifts using advanced control techniques. Different control strategies are implemented and evaluated, including the use of a State Observer, LQR (Linear Quadratic Regulator), and LQG (Linear Quadratic Gaussian Controller). The State Observer is used to estimate the system's internal variables, allowing for more precise feedback. The LQR is employed to design a controller that minimizes a cost function, optimizing the balance between control effort and state error. Finally, the LQG incorporates a Kalman filter to handle system uncertainty and noise, providing robust and efficient control. This demonstrates a significant improvement in the precision and stability of the scissor lift, reducing overshoot and enhancing operational safety. This research contributes to the development of more advanced and safer control systems for industrial applications, optimizing the performance and reliability of scissor lifts.

Design and Manufacturing of Scissor Lift with Movable Panels for Material Handling

A scissor lift or mechanism is a device used to extend or position a platform by mechanical means. The term “scissor” comes from the mechanic which has folding supports in crisscross “X” pattern. The extension or displacement motion is achieved by the application of force to one or more supports, resulting in an elongation of the cross pattern. The force applied to extend the scissors mechanism may by hydraulic, pneumatic or mechanical (via a lead screw or rack and pinion system). The need for the use of lift is very paramount and it runs across labs, workshops, factories to lift load, machine etc. expanded and less-efficient, the engineers may run into one or more problems when in various use. The name scissors lift originated from the ability of the device to open (expand) and close (contract) just like a scissors. Considering the need for this kind of mechanism, estimating as well the cost of expanding energy more that result gotten as well the maintenance etc. it is better to adopt this design concept to the production of the machine. The maximum lift of table is 1380mm and minimum lift of table 800mm. It is has mechanism which is completely mechanical which has lead screw and motor unit for to opening and closing of lift .Key Words: Hydraulic, Pneumatic, Mechanical, Lead screw, Rack and pinion.

Assessment of different lifting devices for the shipping bays for DONES main building

During the installation and maintenance phase of IFMIF-DONES (International Fusion Materials Irradiation Facility-DEMO Oriented Neutron Source), several components need to be transported vertically between different floors inside the DONES main building. There are totally four shipping bays inside the main building, two of which are mainly responsible for components transportation. The lifting devices in the shipping bays should be carefully selected based on the requirements of components, including their sizes, weights, shapes, activation status, shielding requirements, human escorts and transportation routes. Considering these requirements and the building information, five possible lifting devices are proposed, namely parallel ropes lift, heavy load storage and retrieval machine, rack and pinion lift, upside-down scissor lift as well as rigid chain lift. The optioneering method is applied to assess the different lifting devices with the help of weighted criteria. As a result, parallel ropes lift, heavy load storage and retrieval machine and rigid chain lift are assessed as the most appropriate lifting devices in the shipping bays for DONES main building. A market survey is carried out on these three kinds of lifting devices. At the end of this paper, the principle sketches of the rigid chain lift inside the shipping bay are shown including the transport platform.

Design of Multipurpose Scissor Lift

Abstract: A scissor lift is mechanical device used for various application to lift load to certain height, raise or lower, transfer material one place to desired place. In this project design to reduce work time and increase productivity in market single design format is available in this design multi tool has attached to single scissor design to complete multi work to reduce error and increase productivity

Анализ сил в математической модели ножничного подъемника

The aim of study is to present a method and tools for analyzing forces in the mathematical model of a scissor lift. The object of the study is the HeshbonLift51G scissor lift. A mathematical model of the scissor lift is developed to determine the restraining force, deformations, and stresses. Graphs depicting the relationship between the equivalent moment and rotational speed with respect to the angle are identified. The maximum rotation angle reaches 70° when the reaction force becomes maximum in the supporting link. MATLAB and ANSYS programs were used to analyze the lift and its key parameters. The results of the static analysis show that with a uniform increase in load of 400N, the equivalent maximum stress increases by 3.1162 MPa, and the equivalent mean stress increases by 0.06 MPa. This indicates an increase in stresses in the lift components with an increase in load, potentially affecting the strength and durability of the system

Mechanical analysis and materials selection of a scissor lift system for pig transportation

Pigs can experience stressful moments during handling practices before arrival at the slaughter location, so adequate handling plays a crucial role in pig response to preslaughter stress. This work presents preliminary mechanical analysis and materials selection of a scissor lift system with the purpose of loading and unloading pigs for transport. The scissor lift offers a simple design and is frequently used as a lifting mechanism in the automotive, aerospace, advanced manufacturing, and transportation industries due to its flexibility to adapt to different uses. The design and mechanical analysis of the proposed scissor lift mechanism were performed to carry pigs ranging from 80 to 180 kg with a working height from 1 to 1.2 m to meet the first-floor height of traditional trucks. The model and the components of the system were dimensioned to ensure the well-being of the animals, avoid injuries, and reduce the stress that negatively affects meat quality. The structural analysis of the system was developed through classical analytical calculations in association with materials selection. The proposed design is apt to load and unload pigs safely and be used with different types of trucks.

Analysis of Work Posture in the Car Body Assembly Process Using the Rapid Entire Body Assessment Method

CV. Faisyal Putra Mandiri located at Kandangan Rejo Lebar street No.11 Surabaya City, is one of the manufacturing industry companies engaged in car body production. In their work activities there are still workers who do not apply ergonomic work postures while working. Unergonomic work positions can cause some parts of the body to not be in their normal position so that they are very vulnerable to musculoskeletal disorders. To overcome these problems, work posture improvement is carried out. Based on the results of the study, it was found that after simulating the use of tools in the metal cutting process, namely the Hydraulic Scissor Lift Table, it can reduce the risk of worker injury through a final REBA value of 7 with a moderate risk level to a final REBA value of 2 with a low risk level. Then in the welding process can reduce the risk of worker injury through the final REBA value of 9 with a high risk level to the final REBA value of 3 with a low risk level. In addition, it is recommended to use a chair as a tool, which is proven through work simulation to reduce the risk of injury. In metal cutting, the REBA value drops from 7 with a moderate risk level to 3 with a low risk level, and in welding, from 9 with a high risk level to 3 with a low risk level.

Multi-Physical Modelling and Simulation of a Planar Translational Scissor Lift Mechanism for Maintenance of Rail Transmission Lines

The maintenance of railway infrastructure plays a critical role in ensuring the optimal availability and safe operation of railway tracks and associated equipment. Nevertheless, the preservation of train power transmission lines presents noteworthy hazards as a result of the amalgamation of electrical perils and maintenance-associated risks. This study aims to present the design and simulation of a planar translational scissor lift mechanism. The objective is to assist maintenance personnel in the rail sector specifically during power transmission line maintenance. The scissor-lifting mechanism was modelled in Solid Works, a software programme known for its comprehensive 3-D modelling capabilities. Additionally, a mathematical model was constructed to analyse the behaviour of the scissor lift. The dynamic response of the system was investigated through the utilisation of MATLAB/Simulink to conduct kinematic and kinetic simulations. The research findings unveiled the comparative kinetic correlation between the hydraulic cylinder and other constituent elements, effectively capturing their dynamic behaviours throughout the operational process. In addition, the utilisation of Simscape facilitated the optimisation of the mechanism's design through simulation analysis, thereby offering valuable insights to inform and improve subsequent design iterations. The experimental findings indicate that the system design effectively raised the maintenance platform to a height of 2 metres in a time of 20 seconds while accommodating a load range of 500 to 1000 kg. The study presents a systematic and logical design approach that establishes a scientific foundation for the mechanism. This positions it as a valuable theoretical reference for future advancements in scissor lift development. The results of this study make a valuable contribution towards enhancing safety and efficiency in rail maintenance operations. Additionally, they help in reducing the risks associated with power transmission line servicing. Furthermore, these findings lay the foundation for future advancements in railway maintenance technology.

Analysis of Employee Work Posture with the Quick Exposure Check (QEC) and Rapid Entire Body Assessment (REBA) Method (Case Study: CV. Wijaya Mandiri Label)

CV Wijaya Mandiri Label is a company engaged in offset printing label printing. The products produced from the company can vary according to customer demand. The printing industry generally still uses work activities in the form of manual material handling which includes lifting, pushing, and pulling to move an object. This research aims to identify the level of potential risk of injury to employee work postures. In this study, the methods uses were Quick Exposure Check (QEC) and Rapid Entire Body Assessment (REBA). The QEC method is used as an initial identification of potential ergonomic problems and the risk of injury at workstations where the exposure level is 83% (very high risk) and 82.7% (very high risk). So that further research is needed by assessing work postures using the REBA method with REBA score 11 (very high) and REBA score 9 (high). The proposed improvements are in the form of manual scissor lift table and an adjustable work desk following the anthropometry of workers. From these tools can reduce the risk level REBA score from 11 to 7 (medium) and REBA score from 9 to 5 (medium) which is known from the simulation results of using tools using 3D software.

An Overview of the Benefits and Advantages of Implementing Mechanisation in the Oil Palm Plantation: A Look at Fresh Fruit Bunch (FFB) Evacuation

The oil palm industry is labour-intensive to efficiently sustain the productivity of plantations. This article aims to review the benefits and advantages of mechanisation and introduce the types of machinery available to achieve it. The implementation of mechanisation in the oil palm plantation can help ease the dependence on human labour while avoiding diminishing field output. Fresh fruit bunch (FFB) evacuation involves the transportation of FFBs after harvesting from the field to the mill. The conventional methods for evacuation activities involve the use of wheelbarrows and lorries or tractors. The harvested FFBs will be evacuated using a wheelbarrow from the infield and placed on a platform before being hauled out of the plantation by tractor or lorry to the mill or collection point. New tractors attached with FFB grabbers and the systematic planting of oil palm in rows can help to reduce the amount of labour required and improve the quality of life for plantation workers. The Malaysian palm oil board (MPOB) has developed transport vehicles such as the Hydra-Porter, Grabber, and Beluga that are available to the industry. Optimising FFB evacuation in the oil palm plantation could improve FFB yields. Plantations that implemented the scissor lift trailer and FFB grabber combination could on average collect 27.5 tonnes of FFB a day.

Electromechanical Actuator-Based Solution for a Scissor Lift

Electrification and hybridization in non-road mobile machinery have attracted considerable attention in recent years. Normally, these green solutions concentrate on drivetrains, slowly penetrating to the implements or, as they are commonly known, working hydraulics. The primary difficulties associated with drivetrains were successfully addressed through the implementation of electric solutions and the utilization of hydraulic configurations. However, existing hydraulics solutions are typically challenged by innovative pure electromechanical solutions to perform the same work. Therefore, the purpose of this study is to illustrate the impact of replacing a conventional hydraulic topology with an electromechanical actuator (EMA) solution. This paper presents a case study of the electrification of a scissor lift, which was evaluated by simulation and experimental works from an energy perspective. The simulation study demonstrated the energy consumption and power requirements in conventional hydraulic (i.e., non-efficient in comparison with advanced systems) and EMA-based topologies for a single lifting cycle. Finally, an average of 35–50% of the consumed energy was saved, which is confirmed based on a completed simulation study case for the scissor lift application.

Nondestructive Forensic Investigation of a Scissor Lift Fatality

After a worker was found fatally pinned between the top rail of a scissor lift and an overhead beam, rescue attempts were frustrated by unresponsive lift controls. In the investigation of this fatal accident, certain lift controls did not function or functioned intermittently. The intermittent nature of the malfunction indicated that the evidence was sensitive — likely to be disturbed if the device was disassembled using typical destructive techniques. Therefore, nondestructive techniques were required. This study discusses how X-ray imaging, computed tomography (CT), electrical testing, and engineering analysis of the lift and control system were used to investigate the causes and contributing factors of this fatal accident without disturbing sensitive evidence.

Development of mobile smart material-handling system

The global surge for achieving economics in the field of manufacturing has led to the evolution of the industrial manufacturing system to industry 4.0. Autonomous mobile robots are integral to the smart manufacturing and logistics system. In this work, a smart material handling system is designed and developed, which can work autonomously and can be integrated with another subsystem of the manufacturing system. An algorithm is developed on the ROS platform for performing loading, transportation, and unloading operations while navigating the path autonomously. Simulation is done using Gazebo and RViz application software. A CAD of a scissor lift for loading/unloading operations is designed using Autodesk Fusion360 and fabricated through FDM 3D printing. For validation, a working model of the smart material handling system is developed by mounting the scissors lift on a commercially available mobile robot Turtlebot3 Waffle Pi and interfacing the scissors lift actuators with the mobile robot controller. The simulation and experimental results for various layouts of the warehouse validate the developed system.

Investigation on the Design of Double-Stage Scissor Lifts Based on Parametric Dimension Technique

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.

Numerical and Experimental Determination of the Wind Speed Value Causing Catastrophe of the Scissor Lift

The current work is devoted to the numerical determination of the wind speed value, which can cause the overturning of the mobile elevating work platform of the scissor lift type. In the first step of the analysis, the scaled model of the real vehicle is prepared. In the second step, the model is used in the aerodynamic tunnel to determine the aerodynamic force values and moment, which act on the vehicle. The three different configurations of the work platform are considered, namely: (a) The work platform raised to the maximum height with an additional bridge extended, (b) the work platform raised to the maximum height, and (c) the work platform half raised. In each position, the direction of the wind is changed from the range from 0° to 180° with an increment equal to 15°. In the next step of the analysis, the CFD simulations are carried out. The ANSYS Fluent R22 software is used. As a model of turbulent airflow, the standard k-ε with standard wall function is adopted. The obtained experimental results are used to verify the numerical model. A very good agreement between the results of the experiment and the results of numerical simulations is obtained. As the main result of the numerical study, the values of the tipping moment and corresponding wind speed that cause the overturning of the analyzed real scissor lift are determined. It occurred that the lowest value of the wind speed is obtained for the first variant of the vehicle configuration V1crt = 22.315 m/s for the angle of the wind speed direction β = 30° and the highest one for the third variant V3crt = 34.534 m/s and β = 15°, without any persons on the work platform. The presence of human beings on the work platform is also considered.

Design and Prototype Production of Scissor Lift Platform 25 Tons Capacity

In this study, an innovative 25-ton-capacity scissor lift was designed for the first time, and a prototype was produced in Onder Group Inc. Within the scope of the study, a rolling bearing system was designed instead of the conventional welded scissor-hinge connection system. Static and strength calculations were made using finite element analysis for comparison purposes. As a result of the analysis, it was determined that the stress distribution on the roller bearing system was more homogeneous and at lower values (≈60 MPa) than the welded hinge system. In addition, a detachable (bolted) joint was obtained instead of a fixed (welded) joint with the designed rolling bearing system. With the design analyses carried out within the scope of the study, a particular joint-clamp system was made to expand the surface areas of the welded joints.

Proposed Design of Assistant Tools to Reduce the Risk of Disorders (MSDS) Operator of Weaving Work Station CV XYZ

The weaving operator of CV XYZ has an unergonomic work posture with a bent back and unbalanced legs at work. This non-ergonomic condition was identified by using the Nordic Body Map questionnaire to find out complaints on 28 body parts of three operators. From the identification of weaving operators using a nordic body map, it is known that there are complaints on the back, waist, and hips of the body. Identification using the Rapid Entire Body Assessment method shows that the final result of the assessment is 11, which means that there is a need for improvement now on the operator's work posture. The results of the QEC method show an exposure score of 97.12% for operator 3 and the action that must be taken is research and changes now. To reduce the risk of high work posture, a proposal for improving the working posture of the weaving machine set up operator was formulated by designing a manual scissor lift tool. In the process of designing tools, Indonesian anthropometric data is needed. The stages of designing tools are identifying operator needs, conceptualizing tools using a need metric matrix, selecting tools concepts with combination tables and scoring concepts and describing the design of tools using AutoCAD and CATIA software. From the results of the selection of several alternative concepts, a tool in the form of a manual scissor lift was chosen which has a combination of elements, namely a square working platform design, using 2 hydraulics and raw materials made of steel. Meanwhile, the manual scissor lift specification has a maximum height of 85 cm, a footing length of 70 cm and a footing width of 46 cm. It is known that before the proposed improvement, the final result of the REBA score was 11 and after the improvement the final result of the REBA score was 4 which indicates that the operator's work posture has improved after using the assistive device, especially in the arms, legs and back of the operator

Application of MOORA and MEREC methods to select the best schema of scissors mechanisms

A lift table is a very common device in industry. To lift goods or people, this device employs a scissors mechanism. There are numerous designs for the scissors mechanism. Each schema will produce a different set of output responses when given the same set of input parameters. As a result, determining the best scheme is critical when designing an optimal lift table. The results of a study that used the multi-criteria decision making (MCDM) technique to determine the best scheme for designing a lift table to meet two criteria at the same time: minimum lifting time and maximum lifting force are presented in this paper. To achieve this, nine different scissor lifting mechanism diagrams were analyzed using the Multi-Objective Optimization Ratio Analysis (MOORA) method to solve the MCDM problem and the Method based on the Removal Effects of Criteria (MEREC) to calculate the weights of criteria. Finally, the most effective lift table design scheme has been suggested.