DESIGN AND STRENGTH ANALYSIS OF A CRANE HOOK WITH A 500 KG LIFTING CAPACITY

A bridge crane is a type of crane that is designed for lifting / lowering and transferring material in the horizontal direction and is used mainly in production halls, warehouses and transship points. A part of the lifting mechanism of the bridge crane is a crane hook on which the load is suspended. Sufficient strength is required from the crane hook in order to be able to withstand high loads relatively well. The most stressed part of the crane hook is the curved inner surface. This surface is considered critical in terms of strength. The goal of this paper is to select a suitable crane hook for a single girder bridge crane with a load capacity of 500 kg and a strength analysis of the selected crane hook. Strength analysis is performed by two methods, first is based on analytical calculation and second is based on finite element method (FEM) performed in Ansys software. The comparison of the obtained total stresses from both methods is the part of the analysis. From the results of the FEM analysis and analytical calculation it can be stated that the selected crane hook RSN 05 P - DIN 15401 with a load capacity of 500 kg is suitable for the above-mentioned bridge crane. It can also be concluded that the total stress determined by the analytical calculation is lower by 9.8 % compared to the stress obtained from the Ansys software.

NAVAL ARCHITECTURAL CONSIDERATIONS IN THE DESIGN OF FLOATING DOCK

A brief introduction about floating docks, its advantages and types have been described. The naval architectural considerations which play a significant role in the design of floating dock have been explained. Typical ratios of L/B and L/D as a function of Dock’s lifting capacity have been presented. Empirical formulation for the same have also been indicated wherever applicable. Intact stability and its criterion as applicable for a floating dock have been described. Critical positions during evolution of docking operation and important considerations while performing stability calculations have been highlighted. Attention has also been drawn to the damage stability of floating dock. Aspects of longitudinal and transverse bending moment, which are the governing aspects in the scantling calculations have been described. Also typical methods for securing and mooring of floating dock, without compromising on flexibility for docking operations have been described. Methodology and consideration which has to be kept in mind while using design software (such as NAPA) have been indicated. Simple size optimization techniques which result in steel / ballast volume reduction have also been explained.

Study and Design of a Mobile Hydraulic Lift Table with Single Scissors

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.

Optimization of the Possibility of Dropping Materials on the Flip-over Bridge for Cassava Roots with Lifting Capacity of 60-80 tons

The paper presents the results of a survey on the ability to vent and dropping materials of the lift-over bridge for cassava roots with a lifting capacity of 60-80 tons based on the experimental planning model. The content of the survey on the influence of technological and technical parameters on the ability of venting/dropping materials on cassava trucks when the system of lifting-flip equipment uses transmission and hydraulic control. The research results build regression equations to show the influence relationship between the three basic structural parameters as lifting load, lift angle, distance A. Optimizing multi-objective function with Box Behnken algorithm model, the optimal conditions are as follows: A 5000 mm, lift angle 39.88 degree, lifting load 60.000 kg. Under these conditions, the highest guessing performance is 86,6%, then the objective function achieves the expected value of product clearance 99.9%, specific energy consumption 6.9 kW/h. There is no much difference in the results between the regression model and the experimental results which are similar almost similar.

Influence of high temperature degaussing on lifting capacity of linear motor reciprocating pump

The submersible linear motor reciprocating pump is a new type of artificial lift. The degaussing effect of its permanent magnet at high temperature will reduce the lifting capacity of the linear motor reciprocating pump. In this paper, the thermal stability of NdFeB permanent magnet material was studied by simulating the underground temperature and pressure conditions in a high-temperature and high-pressure reactor and combining with a Tesla instrument. The results show that NdFeB material loses its magnetism rapidly at high temperature, and the residual magnetism is proportional to the ambient temperature of the magnet. The high temperature demagnetization effect of large magnets is more serious due to eddy current loss and hysteresis loss.

Selection and calculation of traction elements of the elevator lifting mechanism

The correct choice of elements of the elevator lifting mechanism and their parameters ensures its reliability, durability, energy and economic efficiency. The paper contains recommendations for the selection of the traction elements of the elevator lifting mechanism and the sequence of determining their parameters based on a multivariate calculation. The purpose of the proposed sequence is to obtain the most rational parameters of the traction elements of the elevator lifting mechanism. The initial data for the calculation are the lifting capacity of the elevator, the nominal speed of movement, the height of the lift of the car. It is also necessary to consider the purpose of the elevator. At the first stage of the calculation, the masses of the cab and the counterweight are determined. In this case, the existing data on analogue lifts should be used. In the absence of such data, the approximate dependences proposed by the authors of the article can be used. At the second stage, the kinematic scheme of the elevator is selected. At the third stage, the type of traction element is selected. On the basis of domestic and foreign experience in elevator engineering and well-known literature, recommendations are formulated for choosing the type of traction element. The final stage is a multivariate calculation of traction elements. It is proposed to evaluate the calculation results taking into account the minimum value of the safety factor in accordance with the EN 81-1: 1998 standard. The calculation of the traction elements considered in the work is only a small part of the process of determining the optimal parameters of the elements of the elevator lifting mechanism. At the same time, already at this stage, variability is introduced, which makes the calculation quite laborious to perform it manually. Obviously, a multivariate calculation method that allows you to analyze many different combinations of parameters of the elements of the elevator lifting mechanism and choose the optimal ones is impossible without the use of a computer.

Analysis of heavy floating cranes and features of their operation

The main characteristics of offshore heavy floating cranes, which are independent navigation without tugs and the performance of cargo operations in open waters with wind and waves, are considered. The safety of navigation in these conditions can be ensured with high seaworthiness and maneuverability by giving the appropriate shape of the bow end of the hull, the minimum windage of the structure, as well as the optimal design of the topside (crane). The requirements for the design and construction of universal heavy sea floating cranes, built after 1966, are analyzed, the operating conditions, depending on the purpose, and the architectural and structural type of floating cranes with a lifting capacity of 100–900 tons are considered. When calculating the strength of the topside, the possibility of the floating crane operating with the maximum load was taken into account when the sea is rough up to three points and the wind is up to five points, taking into account the dynamic and inertial loads arising from rolling in waves, when picking up and breaking the load. In the event of an emergency breakage of the load, the structure of the topside and the boom system must exclude or minimize vibrations caused by the breakage of the load. The results of the calculation of the forces at the breakage of the load must be verified by full-scale tests of floating head cranes, for which the corresponding methods have been developed. The possibility of using the developed structure of the hull and the topside (crane) in the design and construction of modern floating cranes in the production conditions of shipyards is shown.

Measurement Of The Dynamics Of The Sheave Block Of Shipyard Crane With 1000 T Lifting Capacity For Verification Of The Laboratory Stand

The paper includes partial results of the development project entitled “The first Polish gantry crane with high lifting capacity for the shipbuilding industry adapted to work in difficult wind conditions – development and demonstration” (no POIR.01.02.00-00-0017/18). Due to the requirements of working in challenging wind conditions, the crane will be equipped with the sheave block with a hook operating automatically. To resolve this problem, mathematical and then physical models of the innovative crane are required. Therefore, to obtain reliable models, the measurement of the dynamics of the sheave block of crane with high lifting capacity was carried out. At the beginning of the paper, the conditions and used measurement stand are included. Then, the time and frequency analysis of the received measurement results are described. Moreover, the determination of the crane parameters is also presented. The analysis results will be used in further research to tune both the simulation and the physical models of the crane with an automatic hook, which are being developed.

Fabrication of Material Handling or Material Lifting Crane

Our Monkey hoist / Crane is basically use full to construction of multi-story building for lifting of bricks cement bags and concrete etc. With the lifting capacity from 200kg to 700kg. For height of 10m to 150m. In the development of mini crane that are fabricated in tandem with the latest technological advancements. Owing to their design, these cranes allow easy access to sites, where another crane may fail. These cranes are basically used in construction sites for lifting of bricks, steel, concrete, sand, cement and tiles. Acknowledged for their reliable service life, safe operation and compact dimensions, these can be availed from us at aggressive prices.