Complete Set Of Equipment Research Articles

Research on an Intelligent Mining Complete System of a Fully Mechanized Mining Face in Thin Coal Seam.

The mining environment of thin coal seam working faces is generally harsh, the labor intensity is high, and the production efficiency is low. Previous studies have shown that thin coal seam mining finds it difficult to follow machines, does not have complete sets of equipment, has a low degree of automation, and has difficult system co-control, which easily causes production safety accidents. In order to effectively solve the problems existing in thin coal seam mining, Binhu Coal Mine has established intelligent fully mechanized mining and actively explored automatic coal cutting, automatic support following, and intelligent control. The combination of an SAC electro-hydraulic control system and SAP pumping station control system has been applied in 16,108 intelligent fully mechanized coal mining faces, which realizes the automatic following of underground support and the control of adjacent support, partition support, and group operation; the automatic coal cutting of the shearer is realized by editing the automatic coal-cutting state of the shearer and adjusting the automatic parameters. A centralized control center is set up, which realizes the remote control and one-button start-stop of working face equipment. Through a comparative analysis of 16,108 intelligent fully mechanized mining faces and traditional fully mechanized mining faces, it is found that intelligent fully mechanized mining faces have obvious advantages in terms of equipment maintenance, equipment operation mode, and working face efficiency, which improve the equipment and technical mining level of thin coal seam. The application of intelligent mining in Binhu Coal Mine has a great and far-reaching impact on the development of thin coal seam mining technology in China.

NMR Magnetometer Based on Dynamic Nuclear-Polarization for Low-Strength Magnetic Field Measurement

Nuclear magnetic resonance (NMR) magnetometers are considered due to their ability to map magnetic fields with high precision and calibrate other magnetic field measurement devices. However, the low signal-to-noise ratio of low-strength magnetic fields limits the precision when measuring magnetic fields below 40 mT. Therefore, we developed a new NMR magnetometer that combines the dynamic nuclear polarization (DNP) technique with pulsed NMR. The dynamic pre-polarization technique enhances the SNR under a low magnetic field. Pulsed NMR was used in conjunction with DNP to improve measurement accuracy and speed. The efficacy of this approach was validated through simulation and analysis of the measurement process. Next, a complete set of equipment was constructed, and we successfully measured magnetic fields of 30 mT and 8 mT with an accuracy of only 0.5 Hz (11 nT) at 30 mT (0.4 ppm) and 1 Hz (22 nT) at 8mT (3 ppm).

An Innovative Directional Blasting Technique for Coal Mine Exploration and Engineering Testing

Blasting is a key method of controlling large-area hanging roofs and strong mine pressure in coal mine. The crack propagation direction after blasting has a decisive influence on control effect, and the existing blasting techniques have poor directionality, making it difficult to form a continuous, precise crack. A compound blasting technique (CBT) was proposed; this could achieve a precision, directional crack by using the combination of perforating bullet and explosives, with perforating bullet detonation first and then explosive blasting. The principle of directional crack formation by CBT was studied and a complete set of equipment was introduced, and the effect of continuous directional crack forming was studied experimentally. A CBT test was conducted in Tashan coal mine (Datong mining area): the results showed that a single crack surface was formed in the borehole after the compound blasting, which indicated the desired blasting effect. The CBT improves the accuracy and controllability of fractures and realizes precise directional control of rock strata.

Research on Electrical Control and Programmable Controller Based on Laser Tracking Measurement

Different production technology and process have different requirements for control circuit. However, no matter what kind of control circuit, it is composed of some basic control links. Programmable controller is a common electronic data control program, which not only plays a lot of advantages in industrial control system, but also is more and more widely used in people's daily life. It is an essential basic equipment in industrial automation system at present. As a kind of high-precision three-coordinate measuring equipment, laser dynamic tracker can be used to measure the spatial position of various single parts and complete sets of equipment. This paper mainly introduces the application of laser tracking system in electrical control and programmable controller, and looks forward to the development prospect of laser tracking detection technology.

LEGAL PRINCIPLES OF RURAL MEDICINE DEVELOPMENT IN THE CONTEXT OF MEDICAL REFORM IN UKRAINE

Legal support for the constitutional right of citizens to health care and medical care is an important condition for the realization of the principle of recognition the individual on the highest social value. The state guarantees everyone the right to protection of health, medical care and medical insurance; creates the conditions for effective and affordable medical care for all citizens. At the same time, the low level of provision of modern medical equipment, machinery and medicines makes it virtually impossible to provide timely and high-quality medical services in rural areas. The quality of primary health care in rural areas is in terrible condition and the people who live there, and this is more than 30 % of the total population of Ukraine, were very looking forward to changes in this area. After all, most of the old buildings and medical equipment are in poor condition. Medical institutions do not have a complete set of equipment, medical supplies and equipment necessary for primary care. The state of the legal regulation of providing medical care to the rural population of Ukraine objectively needs to be improved. Despite the adoption of numerous normative legal acts, the issues of providing health facilities located in rural areas with the necessary modern equipment and technology remained unresolved until recently. The goal of the article is to investigate the current problems of the legal support for providing medical care in the rural settlements. Particular attention is paid to the reform of the network of the rural health facilities and the problems of staffing. According to the results of the study it is established that from January 1, 2018, the implementation of the rural health reform began in Ukraine. This was due to the need to improve the availability of medical services for the population living in rural areas, to increase the efficiency and effectiveness of the use of funds allocated for the development of health care in the village, to bring the network of healthcare institutions in rural areas and their material and technical support into line with the needs of the population. Rural medicine reform is the lengthy process that requires not only careful adherence to legislation, but also a preliminary assessment of the real state of medicine in the remotest corners of Ukraine in order to prepare a platform for change. It is determined that the implementation of medical reform in cities is perceived better, and therefore much faster is happening, what not to say about the countryside. The prompt and timely solution of the problems of reforming rural medicine is possible with the assistance of the state authorities and local self-government, domestic businesses, foreign investors and financial donors, without which it is extremely difficult to cope with decentralization.

Advances in superlattice cryptography research

One of the widely-known opinions in modern cryptography is that the security of a cryptosystem depends on the security of key. Therefore, key management is the foundation engineering of information security field and its corresponding technical level plays a decisive role in the security and efficiency of entire cryptosystem. Key generation and key distribution are two bottleneck problems of key management which make practical cryptosystem complex and costly to make up for the defects of security. Cryptographic techniques based on physical methods are introduced to generate and distribute secure key which greatly reduce the risk of key management than the traditional techniques based on mathematical methods. Currently, it is a popular research direction to solve cryptographic problems with physical entities such as quantum cryptography, physical unclonable function (PUF), etc. Superlattice cryptography is a brand-new cryptographic technology based on semiconductor superlattice device physics which was developed upon the innovative works of superlattice material electronic characteristics researches and is gaining increasing international influence. Superlattice device taps into the random variation during fabrication processes, therefore the secret is extremely difficult to predict or extract. Moreover, once matched superlattice device pairs are produced, anyone cannot obtain or duplicate, including the original producer with complete set of equipment. Superlattice devices can be used similar to traditional PUF hardware that extract secrets from physical characteristics. It takes full advantages of the internal security of hardware to establish new cryptographic mechanism and application pattern with superlattice PUF devices. On one hand, with the theoretical framework of PUF being introduced to superlattice research, superlattice cryptography becomes a cross-discipline that puts forward a new concept of hardware cryptography and develops PUF theory, and leads to a new research direction for cryptography. On the other hand, superlattice PUF pairs provide a feasible approach to the key management that has long obstructed the information security engineering. This review briefly introduces the origin and development of superlattice cryptography along with current state-of-the-art advances of practical technologies including physical random number generation technology and superlattice key distribution technology. Based on the spontaneous chaotic oscillation of GaAs/Al0.45Ga0.55As semiconductor superlattice, high-quality, efficient and stable physical random number technology was developed, which has laid a good foundation for the subsequent research and development of superlattice cryptography. The superlattice devices were incorporated into the framework of PUF theory in cryptography, and soon afterwards chaos synchronization between unclonable matched superlattice pairs was discovered, based on which a long-haul public-channel secure key distribution was experimentally demonstrated with an unconditional security key distribution protocol with self-authentication capability created. The theoretical significance and application potential of superlattice cryptography have been recognized by cryptographers, microelectronic experts and information security engineers. Despite of academic progress made and innovative technologies exploited in several aspects of superlattice cryptography, our research method and relevant technical route are still quite simple and limited. In the following research, the physical mechanism related to the security properties of superlattice cryptography is urgently needed to be further analyzed, methods to evaluate the security properties of superlattice cryptography devices are going to be systematically developed and a formal proof of the protocol design and security model of the superlattice cryptography will be built. The future works are expected to establish superlattice cryptography as a fundamental information security technology which is fully independently controllable from fundamental theory through device manufacturing technology all the way to application technology in our country.

Limitations of adjustment load range of 325 MW combined cycle plant

This article presents an analysis of limitations of the adjustment load range of a 325 MW combined cycle power unit (CCP-325) based on two GTE-110 gas turbines. It is noted that CCP-325 should have the minimum capacity of about 30% of the nominal capacity (with one GTE-110 disabled) to ensure reliable operation without time restrictions. The article describes the features of GTE-110 operation: 1) Operation with inlet guide vanes (IGV) of the compressor fully opened at the GTE-110 capacity below 65% of nominal capacity required by the manufacturer. 2) GTE-110 capacity changes abruptly in the 18-48 MW range. The following factors were taken into account to determine the CCP-325 minimum allowable capacity: 1) The minimum allowable temperature of high-pressure inlet steam set by the manufacturer is 473°C (emergency shutdown at 440°C). 2) GTE-110 is operated with gas fed into the both areas of the combustion chamber. 3) GTE-110 operation at 65-100% of the GTE-110 capacity within the range of compressor IGV adjustment. The article shows that the minimum allowable GTE-110 capacity is determined by the lowest allowable temperature of high-pressure inlet steam, that is 450°C, on condition that the gas feeding algorithm is adjusted. Based on this conclusion, calculations of the CCP-325 minimum capacity are performed. Results are presented as follows: 1) The CCP-325 adjustment load range is 69–100% with account to the GTE-110 manufacturer’s restriction. 2) Implementation of the recommendations provided in the article will allow reduction of the CCP-325 minimum capacity to 42% of the nominal capacity. 3) Partial disabling of CCP-325 equipment will allow reduction of CCP-325 minimum capacity to 34% of the nominal capacity for operating GTE-110 and to 20% if the suggested recommendations are implemented. It is demonstrated that energy effi ciency of unloading CCP-325 is achieved with a capacity of at least 78 MW with incomplete set of equipment and 139 MW with complete set of equipment.

Tire Crushing Equipment Hydraulic Workstation Design

Tire crushing equipment in crushing the whole tire processing machinery, plastic blocks larger particles using a hydraulic motor driven mechanical crushing. Tire crushing confidential solving process running overload and load startup. The main problem of large particles of plastic blocks using a motor-driven mill is overload protection and load startup. Fluctuation range of shear crushing big tires, large particles occurred requires the use of shears occur when the machine shut down and set the material inside the machine clean. The machine can be restarted. Hydraulic motor with commutation convenience and load startup characteristics. Hydraulic fluid power source as a workstation can provide power for each processing machinery and complete sets of equipment. Working pressure of hydraulic station design includes a power driven mechanical calculations, the hydraulic system. Choice and control hydraulic system, control the temperature of the hydraulic oil , mechanical work , such as the determination of the content of the component.

Establishing Quality Evaluation System of Complete Sets of Equipment for Water Treatment

This paper establishes quality evaluation systems ofcomplete sets of equipment for water treatmentbased on defining the notion and analyzing the development and characteristic of water treatment equipment industry andcomplete sets of equipment. 24 unit operations and corresponding equipment in water treatment were chosen and determined as independent devices ofcomplete sets of equipment for water treatment. Four-layer, which is destination layer, criterion layer, feature layer and index layer, of quality evaluation system are established. 26 quality items are selected according to wastewater treatment practice and some national & industrial standard. Evaluation index describes what index is needed to evaluate quality ofcomplete sets of equipment for water treatment. Evaluation methodology describes how to conduct evaluation of selected indexes. Evaluation rule describes when and in what condition the evaluation was conducted. This work will standardize product quality ofcomplete sets of equipment for water treatmentand promote healthy development of environmental protection equipment industry.

Tire Pulverizing Rate and Countermeasures of Complete Set of Equipment

The utilization of waste tire rubber powder processing complete sets of equipment there is imbalance problems. Tire tore cutter crusher production capacity surplus and large particles. Using small tires and non-free cutting tire for cracking machine in order to reduce the tire cracking machine and large particles of investment cost. Cracking down into tire surface rubber cut and tear broken tire surface rubber two process. Tire tread compound using cutting subdivision controlled again after cutting depth of rubber cutting block method. To tear cut machine tool feed depth is an effective method in control tire broken rubber block size. Tread colloid axial uniform circular cutting technical measures is to ensure that the plastic piece of particle uniform distribution.

Study on Manufacturing Technology of High-Strength Composite Board

This article conducts research on the structure of board and the complete set of equipment development technology. It designs and develops new composite structural design solution and process route. In turn, it develops automatic and smart complete set of equipment, which can produce new high strength composite board. The board combines the advantages of corrugated fiberboard and honeycomb cardboard, so it has broad application prospects and a huge market potential.

New development of longwall mining equipment based on automation and intelligent technology for thin seam coal

The paper introduced complete sets of automatic equipment and technology used in thin seam coal face, and proposed the comprehensive mechanization and automation of safe and high efficiency mining models based on the thin seam drum shearer. The key technology of short length and high power thin seam drum shearer, and new type roof support with big extension ratio and plate canopy were introduced. The new research achievement on automatic control system of complete sets of equipment for the thin seam coal, which composed of electronic-hydraulic system, compact thin seam roof supports, high effective shearer with intelligent control system, and characterized by automatical follow-up and remote control technology, was described in this paper.

The Finite Element Analysis of Shield Disk Cutter Based on Different Working Conditions

The shield machine is a large complete sets of equipment used for underground tunnel excavation in the city construction,it has been widely used in the tunnel excavation. Cutter is one of the key components of shield machine. Different geological conditions and badly application environment make the cutter stress complex. German Herrenknecht S749 shield cutter as an example, using PRO/E software to establish the three-dimensional model, ANSYS Workbench module establishes the cutter corresponding finite element calculation model, the force characteristics of the cutter in working process were analyzed, obtained the cutter`s stress strain distribution. The research results can provide basic data for the wheel structure design and construction maintenance.

On Current Situation and Development of our Industrial Automation Control Technology

The industrial automation control technology is comprehensive technology, mainly including industrial automation hardware, software and systems which reaches inspect, control and optimization, scheduling, management and decision-making, and increases yield and improve quality, reduce cost, to ensure safety. Industrial automation control technology as the most important technology in modern manufacturing in 20th century, which mainly solve the problem of production efficiency and consistency. Although automation system itself is not directly creating benefit of enterprise production, but it has obvious effect of ascension process. Our industrial automation control development road, mostly in the introduction of complete sets of equipment, and at the same time the digestion and absorption of second development and application. Currently our industrial automation control technology, industry and applications have developed greatly in industrial computer system, has been formed. At present, industrial automation control technology is intelligent, network integration and development direction

A Set of Portable Equipment for Fluorescent Magnetic Particle Testing

The field of application, the distinguishing features, and the performance characteristics of the units that form a complete set of equipment for fluorescent magnetic particle testing are described.