This paper is aimed to discuss the strategies for coal machine enterprises to manufacture middle trough of scraper conveyor with intelligent welding equipment. The applications of intelligent welding technologies in production of middle trough for scraper conveyor are comprehensively studied, which include the design of welded structure and process optimization as well as real-time monitoring integrated with multiple sensors. The comprehensive applications of multiple technologies could significantly improve the welding operation efficiency and welding quality of middle trough. It is expected that the content of this research could provide intelligent solutions as references for manufacturing enterprises of coal machine and mining production units.

The robot has wide application scenarios in industrial field. In this article, the advantages and disadvantages and applicable scenes for inspection robots with different structures are discussed; structure and such key technologies as motion control of self-propelled orbit type inspection robot are mainly studied; frame structure, such modules of constituting inspection robot as main control system, control device of motion and walking, signal pickup assembly of vision and sensor, power management (charging device), wireless communication system and auxiliary functions and hardware design of corresponding modules are introduced; motion control method with proportion integration differentiation (PID) control technology of inspection robots and motion control optimization method of inspection robot with the technology of artificial neural network are studied; detection method of motion track for inspection robot based on radio frequency identification (RFID) technology is discussed; applications of inspection robot in industrial field are briefly introduced finally. The movement velocity and stability of inspection robot are improved so that its movement process is effectively optimized with the technologies and methods described in the paper, which could provide the technical support for applications of inspection robot in industrial field.

The influencing mechanisms of banded structure, nonmetallic inclusions and grain size on transverse impact toughness are systematically analyzed aiming at such problems as great fluctuation of transverse impact property and unstable low-temperature toughness of H beam SM490YB for ocean engineering. The Mn segregation and spheroidized inclusions are effectively inhibited, grains are refined as well as microstructure homogenization is realized through adopting such comprehensive measures as composition optimization, modified inclusions with Ca treatment, low superheat continuous casting as well as controlled rolling and cooling. The transverse impact energy at -20 ℃ is improved, fluctuation is reduced, banded structure is improved, spheroidization effect of inclusions are obvious and grains are refined for H beam with specification of H300×300 with treatment of optimum technology.

In order to meet the requirements of steel for engineering structures with high strength, high toughness and good welding performance for bridge, the trial production of Q345qE hot rolled H section steel is carried out by Baotou Steel. It is successfully completed through strictly performing the process parameter requirements of the whole process of smelting, refining, continuous casting and hot rolling. The chemical components of trial-produced steel could meet the requirements of GB/T 714—2015 Steel for Bridge Structures, its yield strength is 417~419 MPa, tensile strength is 533~538 MPa, elongation is 28.5%~33.0% and low-temperature impact energy (-40 ℃) is 178~201 J so that all indexes could meet the standard requirements. The comprehensive performances of steel are stable, which could provide the technical support for industrial productions and applications of bridge engineering of Q345qE hot rolled H section steel.

The development idea of green and low-carbon smelting technology is actively practiced in Baotou Steel by taking the principle of “high efficiency, low consumption and high quality”. In recent years, with the increase of proportion of self-produced ore, gas utilization rate of the whole plant is increased by 2.43 percentage points, fuel ratio is cumulatively reduced by 33.1 kg/t and utilization factor of blast furnace is increased by 0.132 t/(m³·d) through actively improving quality of raw materials and fuel, controlling contents of harmful elements as fired, high oxygen enrichment, high blast temperature and coal ratio, selecting suitable theoretical combustion temperature, optimizing charging system, refining basic management of stokehole and standardized operations of production equipment as well as strengthening collaborative guarantee of working procedures. As a result, all technical and economic indicators are with greater progress.

The factors influencing vibration accuracy are found out aiming at the problem of deterioration of synchronism for vibration table of 2-stream crystallizer for CSP continuous casting machine. The target of recovering vibration accuracy is achieved by such measures as replacing the hinge joint bearing of link mechanism for vibration table, adjusting elevation of base for link mechanism of vibration table and coping standard station of installing crystallizer on vibration table.

The epoxy resin is with the characteristics of high specific stiffness and specific strength so that it is widely used in such fields as the aerospace, automobile, construction and electronics. Its main disadvantage is brittleness so that the bending property of composite using it as the matrix is reduced. It is one approach for effectively solving this problem to use nano materials as the filler of epoxy resin. Therefore, the effects of hybrid filler composed of metallic nanoparticles and inorganic nanomaterials added into epoxy resin on bending property of epoxy resin matrix are mainly studied in this paper. The Fourier transform infrared spectroscopy (FTIR) test results showed that the hybrid filler composed of nano-Ti, nano-MoS₂ and carbon nanofibers (CNFs) was physically adhered with epoxy resin matrix so that the bending property of epoxy resin matrix was significantly improved. The hybrid filler is prepared with nano materials of four different weight percentages (2%, 4%, 6% and 8%). Among these, the enhancement effect of hybrid filler with 4% of nano materials on bending property of epoxy resin matrix is optimum. The morphology characterization of crimped section is carried out with scanning electron microscope (SEM). The synergetic enhancement effects of different metallic nanoparticles and inorganic nano materials on resin matrix are deeply analyzed in this paper, which is hopeful to provide guidance for improving the bending property of resin matrix composite.

The rectification of audit is the “second half” of audit supervision in state-owned enterprises, the “last kilometer” to realize achievement transformation of audit as well as key link of maintaining the safety of state-owned assets and promoting high quality development of state-owned enterprises. In the paper, the prominent problems of ideological understanding, implementing responsibilities, mechanism construction, supervision collaboration and audit team construction in rectification of audit are analyzed by taking the requirements of closed-loop management system of auditing administration as guidance, combining with the regulations of Rectification and Implementation Measures for Problems Identified in Audit issued by the Audit Office of Inner Mongolia Autonomous Region, basing on the characteristics of large asset scale, multi-level supervision, long business chains and great social responsibilities of state-owned enterprises as well as focusing on their actual situations. Moreover, the optimization strategies are proposed from such five dimensions as implementing responsibilities, perfecting regimes, enabling technologies, establishing collaborative mechanisms and audit team construction, which could provide references for state-owned enterprises to achieve the goal of “rectifying one problem, perfecting one regime and governing one field”.

In order to evaluate the welding fatigue performance of plate with high strength wind power steel Q420NE, the plate with the thickness of 20 mm is welded with submerged arc welding process, fatigue trend diagram (S-N curve) of welded joint is obtained through fatigue test and fatigue limit under set condition is calculated based on this. When repetitive loading is set to be 10⁷ times, the maximum measured fatigue stress of welded joint is approximately 300 MPa, corresponding stress amplitude is 150 MPa and survival rate is 50%; when survival rate is 97.7%, its maximum fatigue stress is approximately 284 MPa and corresponding stress amplitude is 142 MPa.

The disease characteristics are accurately studied and judged through refined detection on site aiming at such composite diseases as sedimentation, leakage and structural aging that have become prominent during the operations of closed conduit for diversion closed conduit of Baotou Steel for over 65 years. The systematic comprehensive treatment scheme is established by adopting the collaborative dredging technology of “horizontal directional drilling machine+ dredging vehicle with high-pressure water jet” and graded leaking stoppage technology of composite grouting as well as combining with the full-process closed-loop construction monitoring system. The water transfer function of closed conduit is fully recovered, conveyance capacity is increased from 30% before treatment to 5 m³/s, the designed flow rate of water transfer and service life of structure is extended by over 15 years after implementing this scheme, which provides the reproducible and propagable technological paradigm for treating aged water conservancy facilities in the Yellow River basin.