This report focused on force acting on the hydraulic scissor lift when it is extended and contracted. Generally, a hydraulic scissor lift is used for lifting. Material selection plays a key role in designing a machine and also influence on several factor such as durability, reliability, strength, resistance which finally leads to increase the life of scissor lift. The following project describes the fabrication of a hydraulic scissor lift. Conventionally a scissor lift is used for lifting the body to appreciable height, and many other applications also such lifts can be used for various purposes like maintenance and many material handling operations. It can be of mechanical, pneumatic or hydraulic type. The design described in the report is developed by keeping in mind that the lift can be operated by mechanical means by using pantograph shaped scissor, so that the overall cost of the scissor lift is reduced. The upward motion is achieved by the application of hydraulic cylinder which is placed vertically. In our case upward motion of the lift was to be designed in a portable manner and also which works without consuming any electric power so we decided to use a hydraulic cylinder.
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The paper focuses on the available vertical lifting system for material handling in industries i.e Scissor lift. Scissor-type systems are frequently used as lifting systems in the industry. These systems are mainly preferred to do maintenance, repair, and clean. A scissor lift provides most economic, dependable and versatile methods of lifting loads as it has few moving parts which may only require lubrication. Scissor lift is used in various combination as hydraulic, pneumatic and mechanical. It is used because of its ergonomics as compared to other heavy lifting devices available in the market. As per the problem discussed in the paper the design presented in the same is targeted to solve the problem faced by the industry. Index Terms Hydraulic Scissor Lift, Hydraulic Cylinder, Scissor Arm, Top Platform. Base Support Frame
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— The following paper describes the design as well as analysis of a hydraulic scissor lift. Conventionally a scissor lift or jack is used for lifting a vehicle to change a tire, to gain access to go to the underside of the vehicle, to lift the body to appreciable height, and many other applications Also such lifts can be used for various purposes like maintenance and many material handling operations. It can be of mechanical, pneumatic or hydraulic type. The design described in the paper is developed keeping in mind that the lift can be operated by mechanical means by using pantograph so that the overall cost of the scissor lift is reduced. In our case our lift was needed to be designed a portable and also work without consuming any electric power so we decided to to use a hydraulic hand pump to power the cylinder Also such design can make the lift more compact and much suitable for medium scale work. Finally the analysis of the scissor lift was done in ansys and all responsible parameters were analyzed in order to check the compatibility of the design values
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Lift may be a very simple device used to raise elements or objects or load from ground level to a specific height to perform a particular work with maximum load capacity and minimum efforts of a worker. To achieve this we required the higher strength material, hydraulic components such as hydraulic cylinder, wheels, etc. all the researchers attempt to optimize these parameters according to the concerned requirement. In this review paper, it had been tried to think about different research papers containing the research and analysis made on scissor lift evaluated the design and analysis of hydraulic Scissor Lift. It gives a brief description of its types, working, system requirements and design methodologies. This review paper also focused on the analysis of some research papers containing the entire study of components (hydraulic or pneumatic cylinder, spacing shaft, and platform and scissor arm), selection of material, and analyzes the dimension of components. After the analysis of the research papers, the longer-term scope of the research was also suggested.
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MATEC Web of Conferences
The paper describes the hydraulic scissor platforms and presents an algorithm for their design and optimization. Depending on the dimensions of the platform, the maximum height at which it rises and the maximum load is presented a program for calculating the number of scissors and the forces in the joints. The obtained data allow to choose the type of hydraulic table (with one, two or three scissors) and sizing the elements according to the beneficiary's requirements.
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Physical Science International Journal
The “BENIN TERMINAL” machines are maintained by company technicians who encounter difficulties in the operations carried out on these machines. In fact, it is about improving the procedure for installing and removing engines and gearboxes for BENIN TERMINAL mobile vehicles through the study and design of a single scissor lift table. It has a lifting capacity of 2 tons, a width of 900 mm, a total length of 1900 mm and a maximum height of 2000 mm using a hydraulic system. It works with 12 V batteries, simple and height-adjustable workspace. The lifting table also allows certain operations requiring an average height to be carried out.This device was developed for the BENIN TERMINAL garage in order to reduce the efforts and risks encountered by technicians when installing or removing engines and gearboxes on certain machines, in particular heavy machines such as Reach Stackers and 16ton forklifts.
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The European Journal of Research and Development
In this study, the design of a two scissors greenhouse lift trolley is considered. The maximum height of the platform from the ground is 3500 mm. A program developed in Visual BASIC to automate the design is introduced. The lift is modeled in SolidWorks (SW) and the finite element (FE) modal and static analyses are performed as an initial design first by using graphical user interface (GUI). The lift contains revolute joints and slider joints. A simply supported beam which has two revolute joints and a slider joint is studied to verify how to model the joints. Pim connectors are defined for revolute joints in SW-FE analysis. Spring connectors with very large values are defined between sliding faces in the normal direction for translational joints. The results obtained with solid finite elements in SW are compared with analytical results for the natural frequency and static analyses and it was observed that the results are in good agreement for the simply supported beam. An Exce.
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—The present work deals with the design of a belt drive scissor lifting table to be install on platforms, called skillet, that constitute a typical line of handling on which the operator can stay and proceed to assembly, with times established by the product manufacturing. The aim of this work is to design a new lifting table with the cheapest actuation commercially available, simple and able to respond to the functional requirements, in order to replace two commercial lifting tables actually in use on the skillets along the handling line. In order to satisfy these requirements, the design has involved two different analysis: a dynamic motion analysis and a structural analysis. Keyword-scissor lifting table, belt drive, dynamic motion analysis, structural analysis I. INTRODUCTION Scissors lifting table is a device that employs a scissors mechanism to raise or lower goods and/or persons. Typically, lift tables are used to raise large, heavy loads through relatively small distances. Common applications include pallet handling, vehicle loading and work positioning, automatic production lines, distribution lines and so on. Lift tables are a recommended way to help reduce incidents of musculoskeletal disorders by correctly re-positioning work at a suitable height for operators. They can work in hostile environments, be used indoor or outdoor with a considerable extensive space, be manufactured in stainless steel and have equipment like conveyors, turntables, barriers and gates easily added to their deck plates. The scissors mechanism is one of the most important components of the lifting table, whose capability influences directly the performance of the whole equipment, therefore identifying the structure's dimensions is one of the most critical aspects. Other critical aspects to design a table are to identify the scissors posts, the bottom car and the upper platform, and above all to define the actuation mechanism for lifting. In fact, in the last half century many kinds of actuation mechanism for lifting have been developed and implemented in scissors lifting platform in order to have scissors lifting table with higher and higher loading capability, faster and faster speed and more and more stability at the beginning and the end of the stroke. The first scissor platforms have been built around 1950 by the Jervis B. Webb Corporation [1], although improvements have been made in materials and safety, since then, the basic design is still often used. The concept is ideally suited, since it offers portability and efficiency. Moreover, those industrial platforms retracts to the smallest possible size when they are completely closed. In its first application it has been driven by a hydraulic system and it has had a simple structure. Later, a scissors lifting table has been proposed with a screw drive that has been placed at the bottom of scissors lifting table. The horizontal configuration of the actuation mechanism for lifting requires a high driving force, since the direction of the actuation force is perpendicular to the load direction that is difficult to be provided mechanically. The successive researches have studied the kind of the actuation mechanisms to lift the platform by trying to solve the main problems due to the forces developed in the system, the no constant speed during the vertical movement and the need of electric motors with high power and performance in according to the applied loads. The evolution of the main actuation kinds used in the scissors lifting tables, briefly shown in Fig. 1, underlines that the most advanced kinds of drives are the push chains, the spiral lifters and the flat belts when considering the advantages and disadvantages in comparison with the previous actuation mechanisms. The push chain uses a particular chain that is guided to move vertically by a specific linear actuator, that is connected by joints to the electric motor; in this way it forms a rigid column along which the load to lift is directed. It is one of the most innovative products and it is still subject to research in order to improve its performances, since two chains are needed to stabilize the platform [2], [3]. The spiral lifter is a linear actuator that uses a particular spiral motion to form a rigid column able to lift heavy loads. This mechanism is maintenance-free, but it turns out to be quite expensive and it is not recommended for applications with a high utilization factor [4]-[6]. The flat belts exploit their elastic properties and are suitably wrapped between the arms of the scissor lift to the operating tension. The tension is regulate by a suitable winder shaft on which the belt is fixed, it allows to open or to close the scissors with the consequent vertical movement of the platform. The mechanism has a
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In modern manufacturing world automation plays an indispensable role, when it comes for superior product quality for customer satisfaction and market sustenance. With the help of automation it is possible to achieve higher production rate without compromising in product parameters. In automation Fluid power systems play a vital role due to their efficient working and performance as compared to those of the conventional mechanical systems. The fluid power systems can be interfaced with PLC to automate the operation leading to more accurate and consistent product quality. For this paper, case study was taken where manual material handling system is automated by integrating the mechanical system with PLC. In conventional system, human intervention was more, so the time consumption was also more. With the advent of hydraulic power pack, Scissor lifter mechanism and sensor, human intervention can be reduced which in turn will result in increased efficiency and accuracy with optimization of production time.
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In the industry, as a lifting system, the electrical scissor lift system is commonly used. this system is mainly preferred to do Load lifting and lowering activities, cleaning services, and maintenance-repair activities. In this paper, quantitative design analysis of several principal components of an electric scissor lift will be undertaken. A brushless dc geared-motor will be used to drive the rear wheels of the vehicle within an industrial area with front-wheel steering. The scissor lift will be operated via a motor-ballscrew arrangement. A systematic and detailed evaluation of the design will be carried out with paying particular attention to several aspects such as actuator selection for wheel drive unit and lift motion, quantitative design of the wheel drive gearbox, gearbox bearing selection, qualitative design of scissor lift and ballscrew unit selection, stress analysis of scissor pin joints and ballscrew connections, and vehicle power requirements and the motor control.
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