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Application of Comprehensive Geophysical Exploration Method in Leakage Detection of Levee Liu Jin-peng, Wang Zhi-hao, Tang Ke-xuan, Zhang Mei-duo, Liu Kang-he Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 1-7.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.001 Abstract （195）      PDF（pc） （596KB）（422）       Knowledge map    Save Geophysical detection method is an effective method for non-destructive testing of levees, but each geophysical detection method measures a single physical parameter, such as resistivity value, potential value, seismic wave velocity and so on. There are limitations and multiple solutions in geological interpretation when using a single parameter. This paper introduces the basic principles, advantages and disadvantages of common used geophysical detection methods for hidden dangers of levees, and discusses the application of comprehensive geophysical methods in identifying hidden dangers of levees leakage through engineering examples, which can be used as a reference for similar projects. Reference | Related Articles | Metrics | Comments（0）

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Fuzzy Fault Tree Analysis Method for Dam Failure Probability HUANG Meng-jing Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 8-13.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.002 Abstract （171）      PDF（pc） （321KB）（277）       Knowledge map    Save In order to quantitatively analyze the probability of dam failure and provide decision-making basis for dam risk analysis and evaluation, this paper integrates fuzzy set theory into the fault tree analysis method, studies the fuzzy fault tree analysis method of dam failure probability, specifically analyzes the traditional fault tree analysis method, fuzzy set theory, triangular fuzzy number method, and basic event probability determination method, clarifies the analysis process of the fuzzy fault tree analysis method of dam failure probability,and analyzes the dam failure mode.Finally, taking the calculation of the failure probability of an earth-rock dam as an example, the causes of the dam failure were analyzed in depth, and the top event, intermediate event, and basic event were identified. A fuzzy fault tree analysis model for the dam was established, and the probability of each basic event was triangulated and normalized. The comprehensive determination of the dam failure probability can provide a reference for the next step of risk assessment. Reference | Related Articles | Metrics | Comments（0）

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Study on Stability of Artificial Dam of Underground Reservoir in Coal Mine under Coupling Action of Overburden Rock and Hydraulic Power HU Xiao-long, SONG Dan-qing, LIU Xiao-li, ZHEN Wei-peng, SONG Xi-dong, WU Shu-quan Journal of Hebei University of Water Resources and Electric Engineering    2022, 32 (4): 1-7.   DOI: 10.16046/j.cnki.issn2096-5680.2022.04.001 Abstract （137）      PDF（pc） （986KB）（224）       Knowledge map    Save Underground reservoir is one of the important engineering measures to solve water resource shortage in China. The construction of underground reservoir in mine goaf is of great significance to realize underground space in mine goaf and utilization of mine water resources and energy resources, and promote environmental and ecological protection in mine area. Taking Lingxin Coal mine in Ningxia as an example, a three-dimensional numerical model was established by using finite element method to study mechanical deformation characteristics of artificial dam body of underground reservoir in coal mine under overlying rock mass and design head load. The results show that the deformation of the artificial dam and surrounding rock of the underground reservoir is mainly concentrated in the front section of arch crown support and the bottom floor area of the upstream side, and the deformation of the retaining wall is concentrated in the middle area, and the maximum displacement of the dam is less than 1mm. The maximum stress of the dam is concentrated at the crown of the arch walling support, the maximum stress of the retaining wall is concentrated at the outside of the arch walling support, the maximum stress of the surrounding rock is concentrated at its junction with the arch walling support, and the maximum stress of the dam is less than 3.325 MPa. The maximum equivalent plastic strain of the dam body is located at the junction between arch walling and retaining wall on the upstream side. Numerical calculation and safety factor analysis show that the dam body has good structural stability and meets the purpose of underground reservoir construction and operation. Reference | Related Articles | Metrics | Comments（0）

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Reflections on the Development of Nanjing's Public Transport Under the New Situation LI Chen, HAN Xue Journal of Hebei University of Water Resources and Electric Engineering    2020, 30 (1): 59-62.   DOI: 10.16046/j.cnki.issn2096-5680.2020.01.011 Abstract （123）      PDF（pc） （173KB）（199）       Knowledge map    Save Facing the promotion of urban function and increasing demand for high-quality travel service as well as the rapid popularization of internet travel mode，it is crucial to enhance the service quality of Nanjing’s public transport.Based on the analysis of the current situation，this article analyzes the shortcomings and problems in the system，puts forward strategies such as deepening the supply side structural reform，optimizing the details of travel elements，precise infrastructure delivery，intelligent management improvement，and defining the implementation path for improving the quality of public transport service in the new period. Reference | Related Articles | Metrics | Comments（0）

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Discussion on the Technology and Safety Protection Measures of Hanging Basket Construction Across Freeways JIN Da-zhi, LU Cheng-ming, LU Nan Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 53-57.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.010 Abstract （201）      PDF（pc） （411KB）（197）       Knowledge map    Save In the construction of highway bridges, the hanging basket construction technology has been widely used, but in some special geographical environments, this method still needs to overcome various difficulties and challenges. This article provides a detailed introduction to the design scheme, installation steps, and construction process of the hanging basket for an overpass highway bridge construction case, and explores the safety protection measures during the construction of the overpass highway. The results indicate that during the construction of the cross highway range, protective brackets and protective nets are used to seal the mid span hanging basket. At the same time, a bottom protection platform is set under the main body of the hanging basket, which can effectively prevent scattered materials such as steel reinforcement heads, bolts and nuts, mortar, welding electrodes, welding sparks, small tools, etc. from falling into the traffic lane and prevent high-speed traffic safety accidents. By exploring the construction process and safety protection measures of hanging baskets in this article, solutions and ideas are provided for similar engineering project construction difficulties. Reference | Related Articles | Metrics | Comments（0）

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Innovative Design of Combined Multi-Functional Loading Power-assisted Mechanical Vehicle GONG Xiang, ZHANG Peng-cheng, GAO Yun-li, RU Jiang-yan, YAN Qiong Journal of Hebei University of Water Resources and Electric Engineering    2019, 29 (3): 52-56.   DOI: 10.16046/j.cnki.issn2096-5680.2019.03.008 Abstract （56）      PDF（pc） （867KB）（194）       Knowledge map    Save In this paper,an innovative design method of combined multi-functional loading power-assisted mechanical vehicle is presented.The mechanical structure of the innovative product includes hydraulic lifting mechanism,360-degree free movement mechanism,rotating mechanism,carriage deployment mechanism,and power-assisted platform mechanism,etc.It can easily realize the loading and unloading of heavy goods in express delivery,logistics and other industries to provide assistance,adapt to different operating environments,meet multi-angle and multi-direction operation,and greatly reduce the workers’labor intensity. Reference | Related Articles | Metrics | Comments（0）

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Measurement of Phase Difference Based on FFT and Its Implementation in STM32 CHEN Zhe, FENG Min Journal of Hebei University of Water Resources and Electric Engineering    2019, 29 (2): 40-44.   DOI: 10.16046/j.cnki.issn2096-5680.2019.02.008 Abstract （308）      PDF（pc） （1457KB）（161）       Knowledge map    Save According to the problem of large error in the traditional measuring method for phase difference,this paper presents a digital measuring method for phase difference based on FFT spectral analysis,and builds a measuring system for phase difference by using the ARM＇s processor Cortex-M3core STM32F103.Through the FFT transformation of 64sampling points in a period and withdrawal of the fundamental wave parameter,the phase difference of measured signal is obtained and shown on the LCD.The structure of this system is simple,the cost of hardware is low,and the processing speed is fast.Through the test,this digital measuring system has an effective resolution accuracy of 1degree. Reference | Related Articles | Metrics | Comments（0）

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Energy Audit and Energy Conservation Potential Analysis of a Government Agency in Hebei Province YIN Ziyang, XIAN Xiaodong, YAN Lichuan, HOU Nana, MA Kunru Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 36-43.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.007 Abstract （78）      PDF（pc） （871KB）（149）       Knowledge map    Save China is currently the world's largest energy consumer, with a significant proportion of carbon emissions in the construction industry. In order to promote energy conservation and consumption reduction in existing buildings, China has explicitly required government agencies and other public institutions at all levels to monitor energy consumption in real-time. In order to investigate the use of energy resources by government agencies, achieve scientific, rational, and efficient energy use, improve energy utilization efficiency, and reduce energy waste, an energy audit method was adopted to analyze the energy consumption structure and consumption indicators of a government agency in Hebei Province, comprehensively understand the use of energy resources, tap into energy-saving potential, and propose rational energy-saving suggestions to achieve the goal of strengthening energy management and improving energy efficiency, providing reference for similar public institutions in energy auditing and energy-saving renovation. Reference | Related Articles | Metrics | Comments（0）

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Dynamic Response Analysis of Continuous Beam Bridges Based on Lateral Collision Effect CHEN Kanglong Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 11-16.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.003 Abstract （57）      PDF（pc） （1036KB）（145）       Knowledge map    Save The study of beam dynamic response is an important branch in the field of bridge engineering, especially when considering lateral collision effects. In order to study the effect of lateral collision on the dynamic response of continuous beam bridges, an open system for earthquake engineering simulation (OpenSees) finite element software was used to build a finite element model of the entire bridge. The dynamic response and vulnerability changes of the bridge were compared and analyzed with and without lateral collision. The results show that when the peak ground acceleration is 1.0 gal, the probability of minor and complete damage to the support is 0.97 and 0.71, respectively, without lateral collision, and 0.92 and 0.65, respectively, with lateral collision. The lateral collision effect limits the relative displacement of the support through the limiting effect of the stopper, thereby reducing the probability of damage. This has practical guidance significance for the evaluation, reinforcement, and maintenance of bridges in seismic design. Reference | Related Articles | Metrics | Comments（0）

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Correlation Analysis of Silty Soft Soil Index in Wuchang Area of Northeast China YE Chao-liang, MENG De-qiang, WANG Hai-qiang Journal of Hebei University of Water Resources and Electric Engineering    2020, 30 (1): 1-6.   DOI: 10.16046/j.cnki.issn2096-5680.2020.01.001 Abstract （83）      PDF（pc） （663KB）（140）       Knowledge map    Save The geotechnical parameters have regional characteristics and it is of great practical value to study the correlation of physical and mechanical parameters.Based on the statistical analysis of physical and mechanical indexes of 95groups of silty soft soil in Wuchang area of northeast China.The following conclusions and suggestions are obtained.First，the silty soft soil has the characteristics of high water content，high compressibility，large pore ratio and low strength，but the range of physical and mechanical parameters is large，the coefficient of variation is high，and the average shear strength is slightly higher than the coastal silty soft soil.Second，natural density，dry density and natural water content are highly correlated logarithm.Third，natural moisture content，liquid limit and plastic limit are highly correlated with plastic index，liquid limit and plastic limit.Fourth，the pore ratio is highly correlated with natural moisture content，natural density and dry density，with linear and exponential relationships respectively，and has a significant logarithmic relationship with particle specific gravity.Fifth，compression modulus and compressibility are highly correlated with natural water content，natural density，dry density and pore ratio，which shows that these parameters have great influence on soil deformation.It was moderately correlated with particle specific gravity，but not with liquid index and saturation.However，there was no correlation between the shear strength parameters and the physical properties.Some valuable empirical formulas are obtained by fitting to provide reference and basis for parameter selection of silty soft soil in engineering design of Wuchang area. Reference | Related Articles | Metrics | Comments（0）

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Basic Context and Historical Role of Channel Change of China's Grand Canal LV Juan Journal of Hebei University of Water Resources and Electric Engineering    2022, 32 (2): 1-7.   DOI: 10.16046/j.cnki.issn2096-5680.2022.02.001 Abstract （179）      PDF（pc） （1032KB）（137）       Knowledge map    Save From the spring and Autumn period to the contemporary era, the canal channel has been changing for more than 2500 years, which has roughly experienced several stages. In the pre-Qin period the canal between the middle and lower reaches of the Yangtze River and the canal connecting the Yangtze River and Huaihe River system were dug for the needs of war. From the Qin and Han Dynasties to the northern and Southern Dynasties, the canals connecting the Yangtze River and pearl river systems, the Yellow River and Haihe river systems were dug and the previous canals were dredged to maintain the operation of the ruling class’s political power.During the Sui, Tang and Song Dynasties, the national east-west Grand Canal system was formed and during the Yuan, Ming and Qing Dynasties, the national north-south Grand Canal system was formed. Then the Grand Canal has experienced the decline of the Republic of China and the revival since the founding of new China. The Grand Canal channel is already a cultural heritage and a witness of China's historical development. Therefore, in the process of protection, inheritance and utilization, the Grand Canal channel should be protected in the first place. Reference | Related Articles | Metrics | Comments（0）

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Research on Comprehensive Prevention Technology of Bird Damage on Transmission Line HU Jian, GUO Hao, ZHANG Zhi-hong Journal of Hebei University of Water Resources and Electric Engineering    2020, 30 (3): 42-47.   DOI: 10.16046/j.cnki.issn2096-5680.2020.03.008 Abstract （272）      PDF（pc） （2077KB）（133）       Knowledge map    Save In recent years,with the continuous extension of the power grid and the improvement of the ecological environment,the activities of birds in the vicinity of overhead power lines have increased,which has had a certain impact on the safe operation of the power grid.This paper analyzes the types and mechanisms of bird damage,as well as the regional distribution and laws.Then typical examples for bird damage identification are provided.The common bird damage prevention measures are studied,and new bird prevention measures are proposed to address the shortcomings,improve the transmission line bird prevention level,and reduce the transmission line trip rate,which is of great significance to ensure stable and reliable power supply for the power system. Reference | Related Articles | Metrics | Comments（0）

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Research on Isolated Three-phase Bridgeless Sepic PFC Converter Based on One-cycle Control ZHANG Chun-jiang, TANG Jia-lin, XU De-xun, GAO Jia-ning, SHI Bing-qian Journal of Hebei University of Water Resources and Electric Engineering    2022, 32 (2): 20-28.   DOI: 10.16046/j.cnki.issn2096-5680.2022.02.004 Abstract （246）      PDF（pc） （2020KB）（130）       Knowledge map    Save Power factor correction technology is widely used in rectifier circuits to reduce harmonic pollution. Firstly, this paper studies a new type of isolated three-phase bridgeless Sepic PFC converter, which can realize power factor correction and isolated DC/DC conversion through one-stage conversion. In this paper, each working mode of the three-phase bridgeless Sepic PFC converter is analyzed in detail, and the continuous working conditions of the circuit are analyzed. Secondly, the one-cycle control technology is used to realize the closed-loop control, the core control equation of the one-cycle control is established, the small signal modeling is carried out, and the voltage loop controller is designed to stabilize the system under different parameters in the frequency domain and time domain respectively. The simulation analysis is carried out, and the realization method of digital one-cycle control based on DSP is designed. Simulation and experimental results show that the one-cycle control three-phase bridgeless Sepic PFC converter can achieve unity power factor and small current distortion rate. Reference | Related Articles | Metrics | Comments（0）

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Design and Implementation of Self-study Room Platform Based on Springboot and Uni-app Framework LI Jinzhong, HU Zhiming, CHEN Jiangang, CHEN Hanxuan, ZUO Zuo Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (2): 77-82.   DOI: 10.16046/j.cnki.issn2096-5680.2024.02.014 Abstract （529）      PDF（pc） （551KB）（126）       Knowledge map    Save At present, domestic education has begun to popularize online learning mode on a large scale. However, many existing online learning platforms gradually appear the problem of excessive entertainment and social seriousness, which seriously violatesthe original intention of the birth of online learning platforms. In addition, the platform has relatively limited functions, making it difficult to comprehensively manage the learning status of users, and there is also a considerable shortage of products on the market that meet users'needs. Therefore, this paper designs and develops a mobile self-study room platform based on SpringBoot and Uni-App frameworks, which is specially designed to provide users with learning state management services. The main functions of the platform include five functional modules: self-study state management, learning dynamic management, leaderboard, notepad, and user information management. The platform can provide users with a series of learning state management services to help them develop a good learning self-control, cultivate students' independent learning ability, and improve learning efficiency. Reference | Related Articles | Metrics | Comments（0）

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Research on Fault Diagnosis of Automotive Automatic Production Line Based on DT LIU Ya, HE Liangtao, CHANG Shuo, QI Zemin Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 44-49.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.008 Abstract （91）      PDF（pc） （903KB）（115）       Knowledge map    Save Traditional machine learning algorithms used for fault diagnosis in the automated production lines of automobiles require that the training and test sets have the same distribution and need a substantial number of training samples. However, in practice, fault sample data are difficult to acquire, and the operating conditions of production lines are highly variable, leading to a low fault classification accuracy. In view of these problems, this paper proposes a research method for fault diagnosis in automated automobile production lines based on Digital Twin (DT) technology. This method initially models the actual production lines using SolidWorks, followed by rendering through Unity 3D software, and combines with PLC for DT model simulation. Finally, the method utilizes transfer learning techniques and convolutional neural networks to achieve fault diagnosis. The feasibility of the proposed method is verified by comparison with existing methods. Reference | Related Articles | Metrics | Comments（0）

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Research on Application Technology of Prefabricated Steel Structure Distribution Room ZHOU Ting-ting Journal of Hebei University of Water Resources and Electric Engineering    2023, 33 (4): 26-31.   DOI: 10.16046/j.cnki.issn2096-5680.2023.04.005 Abstract （122）      PDF（pc） （353KB）（113）       Knowledge map    Save In order to actively implement the overall deployment of the “Action Plan for Carbon Peak before 2030” issued by the State Council, the use of prefabricated steel structure construction technology system to replace traditional reinforced concrete construction technology system has great advantages in saving highly polluting cement materials, reducing construction process pollution, and reducing carbon and energy conservation.With the rapid development of civil and public buildings, relying on the distribution rooms in residential areas, research has been conducted on the production and installation technology of prefabricated steel structure flat steel pipe columns and concrete pouring technology. By analyzing the difficulties in the production and installation of rectangular flat pipe columns, targeted design has been made for the rectangular flat pipe column production and installation control plan, which includes production control points, welding stress relief measures, and production and installation guarantee measures.In response to the difficulties in controlling the compactness of concrete pouring, a construction plan for rectangular flat pipe column concrete pouring has been formed, including a construction technology desktop meeting and technical disclosure system, the concrete pouring process flow, and the main standards for quality control of steel column core pouring concrete.The system scheme formed by this study can be used to guide the production, installation, and concrete pouring construction of prefabricated steel structure rectangular flat pipe columns. It has achieved great results in the construction of residential distribution rooms and can be promoted and applied to civil residential and public buildings. It provides guidance for design and construction personnel, and has advantages such as shortening construction cycles, saving materials, and improving construction quality, especially in terms of energy conservation and carbon reduction. Reference | Related Articles | Metrics | Comments（0）

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Analysis of Pavement Diseases Caused by Thermal Regeneration and Research on On-site Thermal Regeneration Construction Technology for Mtn LI Guangyu, WANG Haijiao, WANG Qiyue Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 7-10.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.002 Abstract （71）      PDF（pc） （722KB）（105）       Knowledge map    Save In this paper, the surface layer diseases of K291+250-K315+085 Xinyuan Expressway in Hebei province and the technical indicators of thermal regeneration pavement were statistically analyzed, and the key technical points of geothermal regeneration construction were summarized. the special maintenance project on the upper layer of the highway can adopt the geothermal regeneration construction technology, make full use of waste milling material, by adding 5% ~ 7% (the content of regenerator is 5% ~ 7% of the asphalt content in the milling waste) Mtn modified regenerator, 20% newly mixed modified asphalt mixture (the blending ratio of milling material and new additive is milling material: new additive =80∶20), through the heating unit heating, so that after the “field processing” of the new asphalt mixture to meet the technical requirements of road upgrading. After paving and compacting, the overall quality of the road reaches the qualified standard and meets the traffic conditions. the construction technology is mature, safe and reliable, energy saving and environmental protection, meets the national requirements of low carbon and economy, and provides construction reference and basis for the special maintenance of highway pavement geothermal regeneration technology. Reference | Related Articles | Metrics | Comments（0）

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Research on Coordinated Control Strategy and Grid Connection of Wind-solar Complementary Power Generation System MENG De-yue, LIU Wei, CUI Mao-qi Journal of Hebei University of Water Resources and Electric Engineering    2021, 31 (2): 51-55+66.   DOI: 10.16046/j.cnki.issn2096-5680.2021.02.009 Abstract （194）      PDF（pc） （1832KB）（104）       Knowledge map    Save Photovoltaic power generation and wind power generation are characterized by intermittenency and volatility.Combining the two can effectively alleviate power supply imbalance and improve the reliability of power generation system.In this paper，the photovoltaic electronic module，wind electronic module and battery sub-module in wind-solar complementary power generation system are analyzed and modeled，and the maximum power tracking simulink simulation of photovoltaic power generation system and wind power generation system is completed.On this basis，a wind-solar complementary coordinated control and grid connection strategy is proposed，and the simulation results verify the feasibility of the control strategy. Reference | Related Articles | Metrics | Comments（0）

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Research on Three-Dimensional Slope Modeling Based on GIS and Unmanned Aerial Photography Technology WANG Ruilong, SUN Shiguo, WANG Hengtong, SONG Weiqi Journal of Hebei University of Water Resources and Electric Engineering    2024, 34 (4): 61-65.   DOI: 10.16046/j.cnki.issn2096-5680.2024.04.011 Abstract （54）      PDF（pc） （903KB）（102）       Knowledge map    Save A three-dimensional modeling method for slopes based on Geographic Information System (GIS) and unmanned aerial photography technology is proposed in order to achieve high-precision restoration of surface texture and spatial undulations. The terrain and landform model is constructed using unmanned aerial photography and measurement techniques, and the stratigraphic model is established using GIS technology, thereby obtaining a high-precision three-dimensional model. In a certain section of a highway project, this method is applied to establish a slope three-dimensional model consisting of surface, stratigraphy, and underground mineral components. The results indicate that the slope three-dimensional model established using this method has the advantages of high accuracy and good visualization, and can accurately reflect the true conditions of the slope. Reference | Related Articles | Metrics | Comments（0）

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Design of Bolt Disassembly Equipment for Large Machinery and Equipment ZHOU Li-jie, LIU Hui, GAO Bo, HAO Rui-lin, SHI Yan Journal of Hebei University of Water Resources and Electric Engineering    2021, 31 (1): 51-55.   DOI: 10.16046/j.cnki.issn2096-5680.2021.01.010 Abstract （102）      PDF（pc） （1016KB）（101）       Knowledge map    Save In the repair process of large machinery and equipment,it has the characteristics of high operating position,scattered operating points,heavy bolt disassembly tools,and high labor intensity.These characteristics reduce the maintenance efficiency.In view of these characteristics,in this paper,a auxiliary arm is designed for bolt disassembling.This equipment consists of power assisted mechanical arm,electric hydraulic lifting platform,electrical powered module and supporting apparatus.Integrated with air springs,the power assisted mechanical arm can not only compensate the gravity of service tools but also can reduce the labor of repairmen.The power assisted mechanical arm has large-scale operation space.With the design of two-stage arms,the power assisted mechanical arm can turn 360 degrees and move up and down.The auxiliary arm for bolt disassembling contains electric hydraulic lifting platform and electrical powered module.The electric hydraulic lifting platform is available tohigh operating position.The electrical powered module can be used to move flexibly and efficiently.The supporting apparatus can provide effective support for the auxiliary arm in high-altitude operations.The equipment is simple in structure,convenient in operation,and well-adapted,which can be used to bolt disassembly operation for engineering machinery,mineral equipment,oversize vehicle,and so on. Reference | Related Articles | Metrics | Comments（0）