Lifting Device Research Articles

Complication rate across the minimally invasive surgical treatments (MISTs): where do we stand? A systematic review of the literature.

Over the past decade, the range of surgical options to benign prostatic obstruction (BPO) has expanded significantly with the advent of minimally invasive surgical therapies (MISTs). Nevertheless, the available evidence in the field is heterogeneous. Efficacy and safety thresholds are yet to be determined. To evaluate perioperative and long-term complications after MISTs - including Aquablation, steam injection (Rezūm), Transperineal laser ablation of the prostate (TPLA), implantation of a prostatic urethral lift (PUL) and temporary implantable nitinol device (iTIND) - in patients with lower urinary tract symptoms due to BPO. A systematic literature search was conducted in January 2024 using Medline (via PubMed), Embase (via Ovid), Scopus, and Web of Science. The search strategy used PICO criteria (Patients, Interventions, Comparisons, Outcomes) [1], focusing specifically on patients with BPH-associated LUTS who underwent MIST or other comparative treatments, aiming to assess both perioperative and long-term safety outcomes. Article selection was conducted in accordance with the PRISMA guidelines. The risk of bias and the quality of the articles included were assessed. A dedicated data extraction form was used to collect the data of interest. The initial electronic search identified 3660 records, of which 24 ultimately met the inclusion criteria and were included in the analysis. Overall, Aquablation was associated with a higher major complications rate of 14% (IQR 6-22), particularly in the case of patients with prostates <70 ml. PUL showed a higher early postoperative acute urinary retention rate (10.9%, IQR 9.2-12.3%), while 1.4% of patients treated with iTIND experienced major perioperative complications. Urinary tract infections were mostly reported in series assessing TPLA and Rezūm. The adoption of MISTs for LUTS due to BPH is associated with a varied spectrum of perioperative and long-term complications. Our findings showed an acceptable safety profile with specific complications dependent on the type of MIST performed, highlighting the importance of individualized patient selection and procedure-specific considerations.

Design and Testing of an Integrated Corn Stubble Residual Film-Recycling Machine

The existing residual film-recycling machines struggle to efficiently recover and separate film stubble in a single operation. With roller-type film-rolling device unloading difficulties and other problems, in order to improve the recovery efficiency of film stubble and the separation effect while reducing human labor and to improve work efficiency, we designed an automatic hydraulic unloading film stubble-recycling integrated residual film-recycling machine. The angle of the membrane lifting device was determined by theoretical calculations using the method of coupled simulation of EDEM and ANSYS Workbench. We analyzed the amount of resistance as well as the maximum stress and deformation during the working process of the membrane-lifting device and focused on the design of the membrane–soil separating device and membrane-rolling device. The depth of the film shovel, the forward speed of the machine, and the rotational speed of the driving wheel of the jogging chain were selected as the test factors, and the residual film recovery rate was taken as the evaluation index. A three-factor, three-level test was designed by applying the principles of the Box–Behnken experimental design. The results show that when the forward speed is 1.36 m/s, the soil depth is 147.16 mm, and the rotational speed of the driving wheel of the shaking chain is 77.89 r/min, the recovery rate of the residual film is 87.56%, and the relative error between the experimental value and the optimized value is 2.73%. The experimental results can provide a theoretical basis for the design of the residual film-recycling machine.

High lift devices using compliant surfaces

Stall delay and lift enhancement play a crucial role in modern aircraft performance. This is commonly achieved by devices such as slats or flaps located at the leading edge or trailing edge of an aircraft's wing. In this paper, we report a feasibility study of using light-weight compliant surfaces for novel high lift devices. The effects of compliant flags with one end fixed or both ends fixed near the leading edge and trailing edge of an airfoil were studied by force, flag deformation, and flow field measurements in a wind tunnel. When a flag is placed near the leading edge, the excitation of the separated shear layer from the leading edge is the main mechanism in increasing the lift at the post-stall angles of attack. In contrast, the trailing-edge flag with an excess length and both ends fixed could increase the effective camber and the circulation around the airfoil in a time-averaged sense. The mechanism is similar to that of the conventional Gurney flap effect, and equally effective at pre-stall and post-stall angles of attack. When used together, the compliant flags can delay stall angle by 8° and increase the maximum lift coefficient by 67% in the parameter range tested presently. Compliant surfaces require no external power as a passive method. If they are to be used as active methods, they are light weight, and can be stored and deployed easily.

Analysis of Power Losses and Experimental Method for Determining Resistance in Electric Elevators

To be able to carry out a high-quality analysis of the operation and design of elevator systems with a driving pulley, it is necessary to determine the size of the losses that occur in the drive mechanism and elevator guide rails. The paper defines an experimental procedure for determining the losses and the efficiency coefficient of elevator facilities depending on the relative load of the cabin in operational conditions. The experiment was carried out on a passenger elevator with a rated load of 320 kg and a lifting height of 28 m. An analysis of the resistance, i.e., the source of power losses in vertical lifting devices, was performed, the most significant of which occur and are especially pronounced in worm gear reducers and on the guiding system of the cabin and counterweight, where the type of guiding elements also has an influence. A particular problem is expressed due to the changing state of the contact surfaces (between the guide rails and the guide shoes) during exploitation and the eccentric loading of the cabin. Also, the paper analysed the obtained measurement results to determine the dependence of the efficiency coefficient of the facility concerning the relative load of the cabin.

Analysis and suppression research of high lift device noise based on large aeroacoustic wind tunnel test

The exterior noise of large aircrafts is an important aspect for the airworthiness certification. The high-lift device is one of the key noise sources for large aircrafts, thus the analysis and reduction of high-lift device noise is important and meaningful. Based on the 5.5m×4.0m Aeroacoustic Wind Tunnel and a half model for the aeroacoustic study of large scale aircrafts, the high-lift device noise properties were studied experimentally. First, the experimental platform, the test model, the test system and noise reduction design were introduced. Then, based on the experimental results, the noise characteristics of the high-lift devices were analyzed. The effects on the noise from the angle of attack and the wind speed were compared. The effects on the high-lift device noise from the noise reduction design on slat and flap were investigated. The results show that, the high-lift device noise has a broad frequency spectrum, with some peak frequency components. As the angle of attack is increased, the noise of the model is generally increased in the medium to high frequency range. With the wind speed increased, the noise is increased dramatically, and the frequency spectra keep a good similarity. The peak noise is suppressed by the noise reduction design.

Reliability Analysis of Subsea Riser System Based on Fuzzy Fault Tree Analysis Method

Abstract To deal with the complex structure of subsea riser system and the lack of failure statistics and insufficient information during operation, a fuzzy fault tree analysis (FFTA) method is applied to analyse the reliability of the subsea riser system, and a qualitative and quantitative analysis is carried out by establishing a fault tree model of the riser system to obtain the minimum set of cuts and the basic events. The fuzzy importance degree of each fundamental event is determined as well as the failure probability of the headline event of the fuzzy fault tree, “failure of subsea riser system,” using the triangular fuzzy number computation method. Finally, the “average value” method of comprehensive analysis of the fault tree model, the analysis results show that the bottom event riser check valve, riser buoyancy device, riser working medium isolation valve, riser line, riser gas lift device and other components of the failure of the subsea riser system is relatively the weak links, compared with the actual situation, the analysis results in line with the actual engineering situation, these five aspects should be regularly detected and focused on prevention. In conclusion, this research helps to comprehensively analyse the reliability of the riser system and take into account the uncertainty factors, and provides more accurate guidance on the reliability constraints for the localized design and production of subsea riser system.

Optimization of Potato Planter Soil Lifting Device Based on TRIZ Theory

Optimization of Potato Planter Soil Lifting Device Based on TRIZ Theory

Bridging the gap: Analysis of systemic barriers to irrigation technology supply businesses in Ethiopia

This study examines the barriers faced by irrigation technology and service suppliers in Ethiopia, and their influence on business effectiveness. Data were collected from 42 firm owners and managers across 21 enterprises through online surveys, phone calls, and in-person interviews in August 2020. Additional insights were provided by 35 key informants. The study utilized a qualitative analysis of survey responses by employing narrative and triangulating information gathered from several actors in the irrigation technology supply chain. The results indicate that a range of barrier categories, including difficulties linked to business enablement, technology user behavior, and business capacity, significantly impede the development and success of small-scale irrigation technology enterprises in Ethiopia. More specifically, barriers include the increasing diffusion of substandard irrigation technology products, such as water lifting devices, and a scarcity of genuine spare parts, which present major obstacles for small-scale irrigation technology suppliers in Ethiopia. Insufficient user awareness regarding the importance of maintenance and repair services has led to frequent equipment failures, eroding consumer trust and demand for irrigation technologies. Additionally, limited access to market information and financial constraints, including foreign currency shortages, further hindered suppliers’ ambitions to increase the scale of their operations. More importantly, lengthy import processes and inefficient tax exemption systems increase equipment costs, impeding the adoption and dissemination of technologies, such as solar-powered irrigation pumps. Addressing these challenges is critical for improving the supply and effectiveness of irrigation technology in Ethiopia.

Development trends and modern methods of designing lifting devices for fishing vessels

Development trends and modern methods of designing lifting devices for fishing vessels

Design and field experiment of Codonopsis pilosula film covering transplanter

To address the low efficiency and high labor demands of manual Codonopsis pilosula cultivation, as well as the limitations of existing flat-type transplanting machines that create trenches of inconsistent depth hindering root growth and seedling emergence, a C. pilosula film-covered outcrop tilted transplanting machine was developed. Based on theoretical analysis of the prototype's key components and agronomic requirements for oblique C. pilosula transplanting, the structure and working parameters of the rotary tiller soil throwing device, soil lifting device, track-type soil conveying device, seedling throwing device, and film covering device were determined. The core components' working principles were analyzed, and the soil throwing process of the rotary tiller device was simulated using the discrete element method (DEM). A calculation domain was established, and the results showed that the average mass of the rotary tiller device was 49.44 kg, while the required soil lifting amount for the scraper-type soil lifting device was 21.84 kg, meeting the soil throwing requirements. Field experiments in 10 test areas demonstrated an average qualified rate of 89.50% for planting depth, 84.00% for planting posture, 90% for exposed plant spacing, 4.51 cm for plant spacing, and 8.67% coefficient of variation for planting spacing. These results meet industry standards for planting depth and planting spacing, confirming the machine's effectiveness in achieving high-quality tilted transplanting of C. pilosula seedlings.

Параметры шагающего устройства для добычи полезных ископаемых, рассредоточенных по морскому дну

The purpose of the work is to analyze the aggregates of complexes for the extraction of marine minerals. In particular, the variants of complexes, their advantages and disadvantages are considered. The complex is analyzed, which uses robotic pickers/reclaimers of the walking type to perform mining operations of ferromanganese nodules (FMN) or cobalt-bearing manganese crusts (CMC). Results. The variants of complexes for mining of bottom deposits are analyzed, advantages and disadvantages of different variants are indicated. The device for collecting minerals on the bottom, developed in SPMU, is described, laboratory studies of the model of such a device are considered, the main parameters are presented, the dependence of productivity on the size and time of operations of the cycle of work is indicated. It is determined that for minimal impact on the seabed biota it is necessary to use walking submersibles with an actuator for extraction in the form of rarefaction chambers or a grapple with an impactor (depending on the type of solid minerals). It is shown that the productivity of the walking underwater vehicle varies with the diameter of the rarefaction chamber plates: the optimum plate diameter is 1.5 m. Experimental study of hydrodynamic resistance of “foot” models with different midships cross-section has been carried out. According to the experimental results, the conclusion about the preferred design of the “foot” was made: the cross-section should be a streamlined shape with the smallest drag coefficient cx and have a continuous surface without holes. Experimental studies of tine models movement in water have shown that it is reasonable to use as tine parts the structures without holes, streamlined ellipsoidal shape. Calculations of productivity of mining units when using rope hoisting from the bottom to the ship have shown the necessity of using four or more hoisting devices for realization of the required annual productivity of more than 1 million tons per year. The stages of creating a workable extraction unit including a vessel, vertical lifting device and a system of deep-water collectors require very significant material and monetary costs, so they should be carried out in accordance with the R&amp;D plan and tasks of the relevant ministry and agency and require coordination of efforts of investors, scientists and machine builders.

Experimental investigation of suction and oscillatory blowing as an alternative for a leading edge slat

High lift devices such as flaps and slats have conventionally served in multi-element wings to enhance aerodynamic performances in general, and lift in particular. However, more innovative solutions are required to address the evolving challenges the aviation industry faces to reach higher lift capabilities. Active flow control (AFC) has been studied for many years but applications have remained strictly experimental and did not reach any widespread industrial use to enhance aerodynamic performance. This experimental study investigates applying a novel AFC concept to a high-lift wing configuration to replace the slat with AFC actuators that incorporate suction and oscillatory blowing (SaOB) into the main element of a thick airfoil. The multi-element wing is equipped with an AFC system to investigate the possibility of replacing the leading edge slat with an AFC actuator. The benefits of having an AFC system acting as a virtual slat are discussed quantitatively, with experimental results, and practically as an efficient solution for designing a lighter and more capable high-lift device. This research aims to characterize the application of AFC to a wing in terms of aerodynamics and energy efficiency.

A Review on Underwater Collection and Transportation Equipment of Polymetallic Nodules in Deep-Sea Mining

In response to the anticipated scarcity of terrestrial land resources in the coming years, the acquisition of marine mineral resources is imperative. This paper mainly summarizes the development of underwater collection and transportation equipment of polymetallic nodules in deep-sea mining. Firstly, the collection equipment is reviewed. The deep-sea mining vehicle (DSMV), as the key equipment of the collection equipment, mainly includes the collecting device and the walking device. The micro and macro properties of sediments have a great influence on the collection efficiency of mining vehicles. For the collecting device, the optimization of the jet head structure and the solid–liquid two-phase flow transport of the hose are discussed. The structure of the walking device restricts mining efficiency. The optimization of the geometric structure is studied, and the geometric passability and lightweight design of the walking device are discussed. Secondly, the core of transportation equipment is the lifting device composed of a riser and lifting pump. In order to explore the key factors affecting mineral transport, the lifting device is summarized, and the design optimization of the lifting pump and the factors affecting the stability of the riser are discussed. Then, the relationship between each device is discussed, and the overall coupling of the device is summarized. Finally, the existing problems and future research focus are summarized.

Modeling and Simulation of the Effect of Airbag Thickness on the Performance of Extended Handle Pneumatic Floor Jack

In the process of changing tires, drivers require a suitable lifting device, namely, a jack, that can be inserted into a designated slot strategically positioned beneath the vehicle. Similarly, in workshops and maintenance facilities, jacks are essential for part replacements and maintenance. This research focuses on the design and analysis of extended handle pneumatic floor jacks specifically tailored for light-duty vehicles. The aim is to enhance effectiveness by enabling the repair of multiple vehicles simultaneously using a single compressor. The study utilizes ANSYS 2022R1 to assess the structural weaknesses of pneumatic airbags, aiming to explore technological advancements and develop an optimal airbag design capable of lifting light vehicles. Natural rubber is utilized as the airbag material, with thicknesses of 2.5 mm, 2.75 mm, and 3 mm. The study investigates three different airbag behaviors: von Mises stress, strain, and deformation in two directions. A pressure of 8.2 MPa is applied, and a weight of 4000 kg is imposed. The results indicate that the 2.5 mm and 2.75 mm thicknesses are unable to sustain the load and pressure, with the weakest area identified between the natural rubber and the metal cast iron that contacts the car’s body. Overall, the research achieved its objectives, and the findings will be effectively applied to model the extended handle pneumatic floor jack, facilitating tire lifting for maintenance and tire changes.

Numerical model of interaction of a mobile lift chain with a main gas pipeline pipe in the process of repair work

The paper proposes an original design of a mobile lifting device for diagnosing and repairing support nodes of above-ground segments of gas pipelines without stopping gas transportation. When using such a device, the rollers of the lifting chain interact with the surface of the pipe, which can possibly cause additional stresses in the gas pipeline. At the first stage of studying this problem, a model of a typical gas pipeline overhead crossing for the Carpathian region was built and the maximum operating force that should be developed by the mobile lift during repair operations was determined. At the second stage, a finite-element model of the interaction of the mobile lift chain with the main gas pipeline pipe was built. The additional equivalent stresses arising from the contact of the rollers of the lifting chain with the pipe surface were estimated. Recommendations are given to ensure the safe operation of the gas pipeline when using a mobile lift for local lifting of the pipe above the support of above-ground segments of gas pipelines.

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.

Теоретические и практические основы применения грузоподъемных приспособлений при монтаже оборудования на животноводческих фермах

The article discusses some aspects of the theory and practice of using lifting devices. In our opinion, they directly influence labor productivity and work safety when installing equipment on livestock farms. The proposed material allows you to choose the right lifting devices for these works. Keywords: LIFTING EQUIPMENT, LABOR PRODUCTIVITY, WORK SAFETY, LIVESTOCK FARMS, INSTALLATION WORK, SLING

Simulation Analysis of Electric Field on the Body Surface of Personnel Engaged in Interphase Live Working on 750 kV Double Circuit Transmission Lines on the Same Tower

This article focuses on the assistance of electric lifting devices for phase-to-phase live working. Taking a typical 750 kV double circuit vertical arrangement line on the same tower as the research object, a three-dimensional simulation model of a real tower conductor simulated human is established. The field strength on the human body surface is calculated and analyzed during the process of operators entering the equipotential (conductor) while riding the electric lifting device in order to determine the risk points of the operation and determine the safety protection measures for the human body. Through simulation, it is found that when simulating human entry (exit) and phase-down operations, the human body is located at different distances of 0.4 m-1.5 m directly below the conductor. When not wearing shielding clothing, the maximum field strength of the human head is much greater than the allowable value. If using shielding clothing with a shielding efficiency of 60 dB for safety protection, the surface field strength inside the worker’s clothing can be reduced to 2.25 kV/m, meeting the requirements of live working. Operators should pay attention to the electric field protection at each phase wire when using an electric lifting device to enter (exit) the interphase wire. Equipotential operators must wear a complete set of shielding clothing for 750 kV live working.

Design and Research on the Drilling and Lifting Device of Coalbed Methane Drilling Machine

In response to the problems of complex operation procedures, long auxiliary time, and impact on drilling efficiency in coalbed methane drilling construction, a fast tripping and lifting device for coalbed methane drilling rig is designed. The device has a compact and reasonable structure, and strong process adaptability; The structure of clamping with a wedge-shaped groove and releasing the basket is used. In the drilling operation of the drill-ing rig, the drilling rod is clamped with a lifting device instead of a threaded connection, and the lifting and lowering of the drilling rod is completed with the help of a rotator. The operation is simple, reducing auxiliary time and improving drilling efficiency. Simultaneously using a self sealing floating core tube structure and hydraulic pressurization, the sealing between the lift-ing device and the drilling tool can be achieved. During drilling operations, mud can be directly introduced for drilling, improving the ability to handle drilling accidents.

Low back pain frequency and the related risk factors in nurses and caregivers.

The objective of this study is to investigate the frequency of low back pain and the relationship between low back pain and personal and occupational risk factors in hospital employees. The study sample consisted of 270 nurses and 189 caregivers working in a university hospital. Demographic characteristics, low back pain history, and low back pain risk factors were queried by self-report questionnaires. The Biering-Sorensen Test was used to evaluate the endurance of trunk extensor muscles. Also, the Oswestry Disability Index (ODI) and Hospital Anxiety and Depression Scale (HADS) were used. Of the hospital employees included in the study, 56.5% had low back pain in the last month, and 81.9% had a his-tory of low back pain. The frequency of low back pain was significantly higher among those who work in a stressful working environment, stand for extended periods, lift patients or heavy subjects without using a lifting device, and transfer patients alone. In addition, it was determined that those who exercise regularly and are satisfied with their job had significantly less low back pain (p<0.05). The mean Biering-Sorensen test difference between the two groups was statistically significant (p<0.001). There was a significant difference between the groups with and without low back pain in terms of HADS-Anxiety and HADS-Depression subscale scores. The study findings indicated that being a hospital worker is a risk factor for low back pain, and the decrease in the strength and endurance of the lower back muscles increases the risk of low back pain.