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25 July 2023, Volume 50 Issue 7 Previous Issue    Next Issue

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Management & Innovation

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Detection and Repair of Transportation Damage to Wind Turbine Blades CHEN Yang, SHEN Qishun, LIU Hongliang, LIU Weibing, SHEN Ge 2023, 50 (7):  1-4.  Abstract ( 462 )   Save As one of the core components of wind power generation equipment,the length of wind turbine blades is constantly upgrading with the development of the industry. However,the geographical location of wind farms is usually relatively remote,with poor road conditions. As the length of blades increases,the difficulty of blade transportation further increases. In recent years,blade damage caused by transportation is also common,which has brought great difficulties and hidden dangers to the quality of the blade itself and after-sales service. This paper mainly conducts a preliminary classification of blade damage types caused by transportation,and studies their detection and repairability. References | Related Articles | Metrics

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Solution to Low-speed Braking Noise and Abnormal Noise Faults in Electric SUVs LI Zhanfang, WANG Baosong, XU Zengman, LIU Xixin 2023, 50 (7):  5-9.  Abstract ( 403 )   Save Taking the buzzing noise of an electric SUV when it starts again after braking at low speed as an example,this paper discusses the application of NVH analysis method and BSR analysis method in solving the problem of abnormal noise. The BSR analysis method is used to quickly locate the performance attenuation problem of the rectangular seal ring. The problem of low-speed braking noise is solved by changing the structure of the seal ring and seal groove. References | Related Articles | Metrics

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Introduction of a New Painting Waste Liquid Recovery System in Paint Spraying Room ZHANG Hongbin 2023, 50 (7):  10-13.  Abstract ( 378 )   Save The current waste thinner recovery system in the intermediate and top paint spraying room adopts the recovery method of pumping the waste liquid in the paint spraying room recovery tank into the waste liquid tank in the paint mixing room through the action of the pneumatic diaphragm pump after the waste liquid flows by gravity to the recovery tank in the paint spraying room. Due to the influence of many factors,such as the characteristics of the cleaned thinner,the direction of the pipeline and the long-term use,the waste liquid recovery pipeline is often seriously blocked,causing the recovery device not being able to operate normally. To solve the problem of drying due to the increased viscosity of waste liquid in the recovery pipeline,the recovery mode and circulation mode of waste liquid pipeline shall be switched frequently to ensure the normal operation of the recovery system to a greater extent and improve the recovery rate of waste liquid as a whole. References | Related Articles | Metrics

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Causes and Control Methods of Resistance Spot Welding Spatter in Vehicle Body Manufacturing YU Hongbao 2023, 50 (7):  14-18.  Abstract ( 433 )   Save At present,the resistance spot welding process is widely used for body-in-white welding at home and abroad. However,due to the impact of welding spot position,angle,base metal plate gap,electrode,welding parameters and other factors during resistance spot welding,a large number of welding spatters are inevitably generated. Especially in recent years,the use of galvanized sheet and high-strength steel plate for body-in-white has led to particularly serious spatter problem. Based on the actual production situation,this paper analyzes the causes of spot welding spatter,identifies the influencing factors of spatter in the process of body-in-white welding,and puts forward corresponding control methods to reduce welding spatter,so as to reduce the probability of spatter and improve the welding quality of body-in-white. References | Related Articles | Metrics

Basic Research

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Screening of Saccharifying Strains for Brewing Fen-flavor Liquor by Multiple-microbe Bran Starter DING Juan, XU Qinhu, WANG Xianghe, LIU Ran, HAO Jingwen, QU Liangfan 2023, 50 (7):  19-22.  Abstract ( 392 )   Save For improving the quality of bran starter liquor,clarifying the type and dosage of saccharifying strains used in liquor brewing,and obtaining multiple-microbe bran starter liquor with clean body,unique flavor and short fermentation period,liquefaction power and saccharification power were used as indexes in this experiment,the effects of different inoculum size of Rhizopus oryzae,Aspergillus oryzae No. 1,Aspergillus oryzae No. 2,Monascus and Monascus purpureus as saccharifying strains on liquefaction power and saccharification power of rice-koji were studied by single factor experiment. According to this result,an orthogonal experiment with four factors and three levels was carried out to optimize the proportion of strains. The results showed that the quality of rice-koji was obviously improved by adding Rhizopus oryzae 3%,Aspergillus oryzae No.1 4% and Monascus 3%. References | Related Articles | Metrics

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Research on Sealing Design of Charging and Discharging Parts of New Energy Vehicle DENG Wei, WANG Mengxia, GENG Chong 2023, 50 (7):  23-26.  Abstract ( 407 )   Save With the rapid development of China's new energy vehicle industry,new energy vehicles are used more and more widely,and the demand for charging and discharging is increasing. The market puts forward higher and higher requirements for the safety and convenience of charging and discharging of new energy vehicles. Sealing parts are important parts to ensure users' safety during charging and discharging. This research is mainly aimed at the design of sealing parts of new energy vehicle charging and discharging products,and a reasonable sealing structure is designed by considering multiple modes from the perspective of safety. References | Related Articles | Metrics

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Applied Research of a Comprehensive Scheme for Reducing Paint Slag Output LIU Lu 2023, 50 (7):  27-30.  Abstract ( 406 )   Save The overspray generated by spraying in the painting workshop is treated with a flocculant to form paint slag,which has a moisture content of up to 80% to 95%. When treated as hazardous waste,most of it is wastewater,resulting in an increase in production costs. This article studies a comprehensive scheme to reduce the output of paint slag by gradually reducing the free moisture in the paint slag. Firstly,stable output of paint slag is achieved through automatic scraper slag removal equipment;Next,using a simple lifting drainage device,under the dual effects of gravity and squeezing pressure,after 12 hours of drainage,the moisture content of the paint slag is reduced to about 55%;Finally,the paint slag after being lifted and drained is dispersed on a porous stainless steel tray,placed inside a heat pump sealed low-temperature drying equipment,with a gradient temperature rise of up to 50 ℃. After 12 hours of circulating hot air drying,the moisture content of the paint slag is reduced to below 20%. After comprehensive treatment,the output of paint slag has been reduced by about 60%. References | Related Articles | Metrics

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Analysis and Treatment Method of Zeolite Runner Blockage in VOC Treatment Equipment of Automobile Painting Workshop GUO Jing, ZHAO Yanbo 2023, 50 (7):  31-34.  Abstract ( 410 )   Save Taking the VOC waste gas treatment equipment used in automobile painting workshop as an example,this paper discusses the way to delay the runner blockage. According to the practical experience,the feasible method to delay the runner blockage is summarized. The first is to reduce the paint mist content in the treatment gas from the source,and select dry circulating air treatment if conditions permit. The second is to ensure the capacity of the filter in front of the runner. Suggestions on the design and installation of the filter are put forward. This method provides a reference for the maintenance and use of waste gas treatment equipment in automobile painting and related fields in the future. References | Related Articles | Metrics

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Effect of Rich Resin on Performance of Fiberglass Pultruded Plates for Wind Turbine Blades SUN Zhou, XIE Liguo, WANG Weiwei, JIA Yuting 2023, 50 (7):  35-37.  Abstract ( 407 )   Save With the rapid development of wind turbine capacity towards large-scale,traditional fiberglass fabric main beam structures cannot meet the needs of large-scale blade design. Fiberglass pultruded plates are widely used in blade main beam structures due to their high fiber content,high modulus,and low cost. However,there may be some quality issues in the production process of pultruded plates that affect the performance of the main beam,and there is little research on such issues in the industry. This article mainly studies the impact of rich resin on the basic and static properties of the plates,and proposes suggestions for improving rich resin measures in the production process of pultruded plates. The results show that the rich resin has little effect on the density and fiber content of the pultruded plates,has little effect on 0° tensile properties,and has a certain effect on the 90° tensile properties. References | Related Articles | Metrics

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Optimization of Process Conditions for Enzymatic Hydrolysis of Kitchen Waste with Compound Enzyme QU Liangfan, HAO Jingwen, HUANG Hua, XU Qinhu, WANG Xianghe 2023, 50 (7):  38-41.  Abstract ( 451 )   Save The use of composite enzyme to treat kitchen waste aims to hydrolyze the nutrients in the waste and reduce its solid content. Taking the degradation rate of kitchen waste as index,the effects of compound enzyme dosage and proportion,enzymolysis time,initial pH value,enzymolysis temperature and other factors on enzymolysis reaction were preliminatively studied by single factor experiment. On this basis,the L9 （34）orthogonal experiment was used to optimize the process conditions. The experimental results show that the optimum conditions for enzymolysis of kitchen waste with compound enzyme are as follows：enzyme dosage of 0.7%,initial reaction pH of 6.0,enzymolysis temperature of 55 ℃. At this time,the degradation rate of kitchen waste is 33.98%. References | Related Articles | Metrics

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Research on Energy Saving Management in Automobile Manufacturing Plant WEI Xuanli, WANG Lei 2023, 50 (7):  42-45.  Abstract ( 406 )   Save Under the background of realizing “double carbon” goal in China,the management idea and field operation scheme of energy saving work in automobile manufacturing factory are introduced. Using a combination of theoretical analysis and data analysis,this paper summarizes the energy saving measures and achievements implemented by FAW Toyota factory during 2021 from the aspects of energy saving management and technical transformation,and describes the plans and prospects for future energy saving work. References | Related Articles | Metrics

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Analysis and Research on Effect of Active Control Variable Compression Sealing Strip on NVH Performance of Whole Vehicle WANG Baosong, LI Zhanfang, YUAN Yao, LIU Xixin, DENG Jianghua 2023, 50 (7):  46-50.  Abstract ( 412 )   Save In the development of NVH performance,the door closing force requires that the compression load on the sealing strip is as small as possible,while the abnormal sound and wind noise require that it is as large as possible,there is a contradiction among the three about its performance,and the design process of the sealing strip needs to balance the performance. This paper analyzes the influence of the performance of the sealing strip on wind noise,closing force and abnormal sound,and studies the changing process of the performance requirements of the sealing strip from the performance matrix relationship of the three. The relationship between the radius of the foam tube and the air flow rate is obtained by theoretical calculation. A design scheme and corresponding control strategy for the sealing strip with active variable compression are proposed,so that the performance of the sealing strip can reach the ideal target value of the three at the same time,further improving the NVH performance of the whole vehicle. References | Related Articles | Metrics

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Research on Factors Affecting Interface Strength of Pultruded Sheets for Wind Turbine Blades YANG Zhong, JIA Yuting, WANG Weiwei, ZHOU Zhuang, LIU Xianhong, WANG Pengfei 2023, 50 (7):  51-53.  Abstract ( 392 )   Save The pultruded glass fiber sheets with different storage times and environments and polishing methods were selected respectively. After adding biaxial fabrics between the sheets,the composite material samples were prepared by VARTM technology,and the factors affecting the interface strength of pultruded glass fiber sheets for wind power blades were studied. After the sample preparation was completed,the macroscopic interface strength performance and microscopic morphology of the pultruded glass fiber sheet interface were tested successively. The test results indicate that as the storage time increases,the interface strength of the pultruded glass fiber sheets decreases,and subsequently maintains a stable level;After polishing with 80,120,and 240 grit sandpaper,the surface roughness of the pultruded glass fiber sheets significantly changes. The smaller the roughness,the smaller the interface strength,and the initial interface strength of the pultruded glass fiber sheets cannot be restored after polishing. In addition,under different storage temperatures and humidities,the impact on the interface strength of the pultruded glass fiber sheets is relatively small. References | Related Articles | Metrics

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Study on Production Process and Thin-walled Improvement of Slush Molded Instrument Panel Skin ZHANG Jiawei, ZHAO Yanbo, XIA Yan 2023, 50 (7):  54-58.  Abstract ( 386 )   Save The characteristics and process characteristics of the thin-walling of the slush molded instrument panel skin are expounded,and the differences in production and use of raw materials are compared with those of the old type. Through the debugging of production equipment,relevant quality testing project experiments,and long-term mass production,it has been verified that the use of thin-walled skins can achieve the application effect of weight reduction and cost reduction for the whole vehicle,providing a theoretical reference for the lightweight development of the production process of slush molded instrument panel skin in the future. References | Related Articles | Metrics

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Research on Application of Sulfide Detection Methods in Tap Water LING Jiayang, WANG Ying, CUI Yongqing 2023, 50 (7):  59-61.  Abstract ( 364 )   Save By analyzing the impact of free chlorine on the detection results of sulfide projects,and comparing the effects of factors such as contact time of fixed agents,use of different reagents,dechlorination time,and different treatment methods on the detection results,the necessity and feasibility of dechlorination for detecting sulfide in chlorine-containing water samples were confirmed,and the method was optimized for more accurate detection of sulfide in water. References | Related Articles | Metrics

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Simulation Research on Drop Attitude of Military Cargo Box XU Weifeng, MEI Shuo, WEI Lai, CHEN Zhiqiang, PENG Xiuqian 2023, 50 (7):  62-67.  Abstract ( 386 )   Save To study the dynamic response of a military cargo box under standard attitude drop,the performance evaluation of the packaging system is conducted through simulation analysis to provide data support for the structural optimization,and the simulation test is conducted to compare it with the hypothetical attitude drop. The difference of the response results is analyzed,and the importance of the standard attitude drop modeling in the simulation analysis is confirmed. Hypermesh and LS-Dyna integrated modeling idea is used to carry out finite element simulation analysis of different attitude drop conditions to obtain the stress cloud map of each part of the packaging system and the response acceleration curve of the built-in object. Under the standard attitude,the maximum stress of the system during the drop process of the face and edge does not exceed the yield strength of the corresponding material. During the angle drop process,the maximum stress of the box body is 76.654 MPa,which significantly exceeds the yield strength of the material. Compared with the standard attitude,the maximum stress,the peak response acceleration and the force response time of the system all have deviations in different degrees during the process of edge and angle drop under the hypothetical attitude. The structure of the cargo box will not be damaged when the face and edge drop test is carried out under the standard attitude,and there is a risk of damage when the angle drop test is carried out,so the structure needs to be optimized. In order to improve the accuracy of the drop simulation results of the packaging system,it is very important to build a finite element simulation model with a standard drop attitude. References | Related Articles | Metrics

Applied Technology

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Application of PLC in Management of Intelligent Water Supply System for Greening LIU Tongwei, QI Yanan, PAN Jixin 2023, 50 (7):  68-70.  Abstract ( 359 )   Save This paper introduces the overview of the intelligent water supply system for the greening of a water purification plant in Tianjin and the intelligent switching method of several kinds of water supply modes,and focuses on analyzing the application of PLC for intelligent switching of water supply modes under different water supply flows. By optimizing the PLC program,the intelligent management of water supply system for greening is realized. By using the characteristics of stable operation and accurate analysis of the automatic control system,it not only reduces the workload of operators,but also improves the reliability of system operation. References | Related Articles | Metrics

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Application of Technical Standard System in Water Affairs CHEN Zhuoran, ZHANG Yiran, ZHANG Yaqi 2023, 50 (7):  71-73.  Abstract ( 398 )   Save The establishment and improvement of the drinking water safety guarantee system can help water supply enterprises to use the standards as the basis for the development of water affairs,play the auxiliary role of technical standards for production,and provide comprehensive technical and theoretical support in the whole process of water supply. In actual production,water supply enterprises shall strictly implement mandatory national standards,reasonably select and implement industrial standards,local standards or group standards,formulate relevant enterprise standards according to their own conditions and needs,improve internal control management and optimize operation mechanism,make full use of the guiding role of the technical standard system in the work and help the stable development of drinking water safety assurance. References | Related Articles | Metrics

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Introduction and Application of New Generation MES System in a FAW Toyota Automobile Factory ZHANG Wei, ZHAO Hongpeng, LU Ming 2023, 50 (7):  74-78.  Abstract ( 493 )   Save With the development of the automobile industry,multi model mixed line production has become the mainstream,which requires that factories must meet the hardware and software conditions of mixed line production. In terms of hardware,new equipment with high flexibility and corresponding multi model capability needs to be introduced. In terms of software,MES systems with different levels and functions need to be introduced. Taking the introduction of a new generation of MES system by a FAW Toyota vehicle factory as an example,the introduction and application of MES system is explained in order to promote the application and development of MES system. References | Related Articles | Metrics

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Application of Water-based Intermediate Coating Production Process Introduced into Oil-based Intermediate Coating Workshop LI Jinjing, GUO NA 2023, 50 (7):  79-82.  Abstract ( 376 )   Save This paper describes how the water-based intermediate coating car body is introduced into the oil-based intermediate coating workshop,from the initiation of the project to the comparison of the technical requirements of water-based intermediate coating and oil-based intermediate coating,to the adjustment of the current equipment and the confirmation of the car body parameters after production. The application effect of water-based intermediate coating in the oil-based production workshop is verified through the actual test of burning curve of drying furnace,the adhesion test and hardness test. It provides a reference theoretical basis for the future production of water-based intermediate coating car body in oil-based intermediate coating workshop. In addition,this method can save a lot of equipment transformation costs and corresponding man hours. References | Related Articles | Metrics

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Development and Application of Automobile Oriented Quality Management System ZHANG Wei, ZHANG Yan, MA Yanqing, WANG Liang 2023, 50 (7):  83-86.  Abstract ( 406 )   Save Meeting customer expectations and providing customers with high-quality cars are the lifeline for measuring the quality of automotive enterprises. The paper analyzes the current quality situation and future development trends of automobiles after being launched into the market. Based on meeting customer needs and enhancing market competitiveness,it is the fundamental guarantee for the sustainable development of automobile enterprises. By creating a platform mechanism to meet customer needs and build products that are becoming better,corresponding regional and centralized market complaints or quality tracking are targeted in the production and manufacturing process,and a targeted quality management system platform is established,Targeted quality improvement and cost improvement activities in the production field are carried out to effectively assist in improving the quality and level of after-sales service,enhance the overall trust and competitiveness of products,and achieve further development of the automotive industry and market. References | Related Articles | Metrics

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Determination of Nitrobenzene Compounds in Water by Solid-phase Extraction and Gas Chromatography LIU Jia 2023, 50 (7):  87-90.  Abstract ( 376 )   Save A method for the determination of nitrobenzene compounds in surface water and groundwater by solid-phase extraction and gas chromatography is established. This paper introduces the various instrument parameters and specific sample extraction methods of using solid-phase extraction to purify samples,gas chromatograph electron capture detector to detect 15 nitrobenzene compounds in water. This method has good separation and accuracy. The correlation coefficients of standard curves for all substances are greater than 0.998,the lower limit of determination is between 0.005 5 μg/L and 0.097 μg/L,the accuracy,i.e. the spiked recovery rate is between 78.3% and 115%,and the precision,i.e. the relative standard deviation of the spiked recovery rate is between 1.3% and 9.0%. References | Related Articles | Metrics

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Applied Research of Visual Inspection and Collaborative Robot in Resin Coating Production Line WANG Ke, QIN Yue, XIA Yan, GENG Junyong, XU Da 2023, 50 (7):  91-94.  Abstract ( 390 )   Save The characteristics of visual inspection and collaborative robot are described. The detection accuracy of resin coated parts is verified through visual inspection experiments,and the handling mode of resin coated parts is verified through collaborative robot simulation software. Combined with the process flow and layout of resin coating production line,the application of visual inspection and collaborative robot is studied. The allocation of manual inspection,visual inspection and collaborative robot operations is re-optimized based on Toyota production system. Toyota production instruction system and mobile robot AMR are used to achieve the application effect of decreasing two people,providing an example for the comprehensive application of visual inspection and collaborative robots in the resin coating field to improve production efficiency. References | Related Articles | Metrics

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Application of Hot Stamping Technology in BIW WU Junnan, ZHANG Jinning, LIU Kaiyue, WANG Zhongda 2023, 50 (7):  95-100.  Abstract ( 418 )   Save With the increasingly widespread application of hot stamping technology in BIW,its application scope of use has a tendency to expand,how to make the hot stamping technology better applied in vehicles has become the research dire-ction of various manufacturers. The realization of new production processes for various hot stamping materials,such as patchwork technology,that have emerged in recent years has given engineers more options to develop BIW. References | Related Articles | Metrics

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Application of Frequency Conversion Control in Energy Saving of Cold Water System ZHANG Liang 2023, 50 (7):  101-104.  Abstract ( 396 )   Save In the cost composition of manufacturing enterprises,the energy consumption cost accounts for a large proportion of the total product manufacturing cost. In recent years,with the continuous emergence of new energy-saving technologies,reducing energy consumption in the product manufacturing process has become an effective means for major manufacturing enterprises to reduce manufacturing costs. The chiller is one of the equipment with large energy consumption in the production process of manufacturing enterprises,With different seasons,weather and time periods,the load of the chiller is quite different. Therefore,through the technical transformation of the frequency conversion of the cooling water system of the chiller,the flow of the cooling water is adjusted according to the actual load of the cold water,so that the cooling water always operates at the best temperature,which not only ensures the safe and normal operation of the chiller,but also has an obvious energy-saving consumption effect,especially in spring,autumn and winter,Under the condition of low temperature and small load,the energy saving effect is more obvious,which has obvious economic and social benefits. References | Related Articles | Metrics

Science & Society

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Determination of Perchlorate in Drinking Water by Ion Chromatography with Hydroxide Eluent GUO Zhenyu, WANG Ying, KONG Fanying 2023, 50 (7):  105-107.  Abstract ( 432 )   Save A method for the determination of perchlorate in drinking water by ion chromatography-hydroxide eluent was developed. An AS20 column is used for ion chromatography. The linear correlation coefficient of the standard curve is 0.999 2,the lower limit of the method is 0.005 mg/L,the accuracy is 85.7%-107%,and the precision is 1.5%-9.3%. The method is simple,stable,accurate and suitable for the detection of perchlorate in water. References | Related Articles | Metrics

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Application of Multimedia Technology in Junior High School Physics Teaching LI Haochuan 2023, 50 (7):  108-110.  Abstract ( 391 )   Save Based on the inherent characteristics of physics,multimedia technology has increasingly become an indispensable auxiliary teaching method in junior high school physics teaching. Compared with the traditional single teaching model,physics teaching supported by multimedia technology can become more intuitive,vivid and interesting. The scientific utilization of multimedia technology characteristics stimulates students' interest in learning and thirst for knowledge. It involves setting the content,methods,and rhythm of multimedia-assisted teaching in a reasonable manner to adapt to the actual teaching needs. Additionally,it involves effectively utilizing multimedia simulations and reproduction function to optimize experimental teaching. It can guide and help students understand physical phenomena and theories from a broader perspective,gradually establish a sense of scientific inquiry,greatly improve the effect of classroom and experimental teaching,and improve teaching results. References | Related Articles | Metrics

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Design Method of Constructed Wetland in Sponge City Construction LI Zhiming, WANG Guoqiang, KONG Lingwen 2023, 50 (7):  111-114.  Abstract ( 413 )   Save This paper studies the design method of urban constructed wetlands in sponge city construction,characterizing the important role of constructed wetlands in purifying rainwater in sponge city construction. When the treatment capacity of the constructed wetland in the renovation project is lower than the designed water volume,enhanced treatment facilities should be added at the front end of the wetland to meet the requirements of reducing pollution load,reducing SS,reducing wetland blockage,and deep rainwater purification. After internal structural design and reasonable optimization of various process sections such as pre-enhanced treatment facilities,stabilization ponds,subsurface wetlands,surface flow wetlands,and outlet ponds,constructed wetland projects could effectively reduce the rainwater pollution load in sponge city construction. The effluent quality of constructed wetlands varies with the rainwater load of the pumping station,showing the characteristics of unstable water quality. It is recommended to take appropriate measures to reduce the rainwater treatment capacity to ensure compliance with discharge standards. References | Related Articles | Metrics

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Problems Faced by Cultivation of Scientific Spirit in Middle School Students and Ways to Improve Cultivation Effect HU Shuang 2023, 50 (7):  115-118.  Abstract ( 441 )   Save The cultivation of scientific spirit among middle school students is not only a legal requirement,but also a necessary measure for implementing the strategy of building a strong country through science and technology. However,due to factors such as poor adaptability of teaching materials for scientific innovation education,insufficient number of qualified teachers,and limited technological resources available to students,the overall effect of cultivating scientific spirit among middle school students is unsatisfactory. In order to solve these problems,it is necessary to innovate the methods and approaches of scientific and innovative activities in middle schools,promote the practical application of STEM education models,and enable teachers to improve their own scientific literacy and explore the implementation of large unit teaching in the field of scientific and technological innovation. In addition,schools,families and communities must work together in a coordinated manner to systematically integrate scientific spirit into scientific and technological innovation education in middle schools. References | Related Articles | Metrics

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Reflection on Future Development of Heating Enterprises by Digital Construction SUN Shen 2023, 50 (7):  119-121.  Abstract ( 445 )   Save Heating enterprises have experienced a series of rapid development such as digital construction. Due to the extensive application of Internet of Things technology,artificial intelligence,remote regulation and balance technology,unattended heat exchange station and other technologies,it provides conditions for heating enterprises to enter a new stage of wisdom. This paper describes the development process of digital construction of heating enterprises,and takes a traditional heating enterprise as an example,and expounds the intelligent upgrading and reconstruction scheme of heating enterprises and the future intelligent construction direction. References | Related Articles | Metrics

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Analysis of a Large Hail Weather Process ZHU Xiaojing, DUAN Xianghai, BU Shengtian, XING Rui 2023, 50 (7):  122-124.  Abstract ( 401 )   Save Based on the conventional meteorological data and Doppler radar products,a large hail weather process under the influence of North China cold vortex is analyzed. The results show that：（1） the influence system of this hailstorm is the potential unstable stratification formed by the shallow North China cold vortex,northwest airflow and cold temperature trough at 500 hPa,warm temperature ridge at 700 hPa and 850 hPa;Binhai New Area is located in the divergence zone to the left of the 200 hPa high-altitude jet stream exit zone. It is warm and wet in the lower layer and dry and cold in the middle layer,which is conducive to the occurrence and development of severe convective weather. （2） The effective potential energy of convection is 1 626 J/kg,the convective inhibition is 0 J/kg,the moderate intensity of 0-6 km vertical wind shear is 12.8 m/s,the moderate intensity of 0-2 km vertical wind shear is 10.2 m/s,the humidity below 850 hPa is high,and the humidity above is low,which is favorable for the occurrence of hail and thunderstorm gale weather. The height of 0 ℃ layer is 4.2 km,it is suitable for hail formed. （3） About 1 hour before hailstorm in Binhai New Area,radar products show hailstorm characteristics：reflectivity factor value more than 55 dBz,vertical accumulated liquid water content more than 65 g/kg,and side lobe echo appears,indicating that large hail would fall,and the approaching warning of large hail could be issued about one hour in advance. （4） The strong radar reflectivity factor moves along the direction of 500 hPa guiding airflow and ground convergence line,and is strengthened after entering the Bohai Sea. The mesocyclones are identified by radar and develop into supercell hail storms. （5） The reasons for the strengthening of the hailstorm cells as a supercell storm after entering the Bohai Sea are as follows：the humidity in the lower layer increase,the instability of the upper cold and lower warm potential increase,the vertical wind shear in the deep layer is strengthened,and the divergence field is closer to the left side of the exit area of the 200 hPa upper-level jet stream,which is more conducive to the upward movement and the organization of the storm. References | Related Articles | Metrics