Grinding head is a kind of small handle grinding tools, used in electric mills, hanging mills, hand electric drills. There are many kinds of diamond grinding head, ceramic grinding head, rubber grinding head, diamond grinding head, emery cloth grinding head.
Ceramic grinding head: grain size sand (generally brown corundum, white corundum, chrome corundum, silicon carbide) sintered by ceramic binder, with a metal handle in the center. Mainly grinding all kinds of metal, for grinding the inner wall of aperture, mold correction. Rubber grinding head: fine sand is synthesized by rubber binder for the polishing of mould
Diamond grinding head: A kind of stone material, ceramic materials and other non-metallic materials of grinding tools, especially involving a with diamond alloy grinding tools for grinding body, it includes substrate and a mill body, in which several mill body clearance to fixed to the substrate, the grinding surface of the grinding head grinding body also set a clearance, among them, the substrate is best by a certain toughness of adhesive materials, The grinding body is preferably made of diamond alloy material. The utility model has the advantages of high grinding performance, simple manufacturing and low cost, high grinding quality and being suitable for large-scale grinding
Abstract: This article introduces the background of the research and application of electrical fire monitoring system, introduces the basic principles, basic components and system networking scheme of an electrical fire monitoring system, thus confirming the reliability and use value of the system.
Keywords: electrical fire; monitoring system; application
0 Preface
With the rapid development of China's economy and society, people's production and living power consumption have increased significantly, and electricity has become an indispensable part of humanity. Electricity creates huge wealth for mankind and brings a lot of convenience to people's lives, but it also inevitably brings some hidden dangers. Due to various reasons such as short circuit, overload and poor contact, fires and even major fire accidents have been caused, causing huge losses and even disasters to the national economy and people's lives. The lessons are extremely profound. According to statistics: from 2000 to 2010, there were 3,874,400,000 electrical fires in China, which accounted for 28.1% of the national average. The incidence of electrical fires and the resulting property losses rank first among all causes of fires. Especially in these fires, heavy electrical fires occurred from time to time. For example, in 2005, the Huanan Hotel in Shantou City, Guangdong Province caused a catastrophic disaster caused by the ignition of combustible materials due to short-circuiting of the electrical wiring in the chandelier, causing 31 deaths and 3 injuries. There are many disasters similar to this data or even more than this data. Therefore, it is imminent to strengthen the research of electrical fire control technology. The electrical fire monitoring system has emerged as an advanced electrical fire warning technology and has been widely used. Great economic benefits.
1. Introduction of electrical fire monitoring system
The ARCM residual current electrical fire monitoring device is installed in the low-voltage power distribution system and is used to detect the residual current, temperature and other electrical parameters in the system related to potential electrical fire hazards. When the parameters of the monitoring device in the protected line exceed the alarm setting value , Alarm and control signals can occur in order to eliminate the hidden danger of electrical fire caused by residual current. The product uses RS485 bus for communication. It can be combined with other monitoring alarms, monitoring units or monitoring hosts to form a monitoring system. You can choose a centralized bus-based information management mode or a function-based information management mode according to user needs. The system realizes the early prevention and alarm of electrical fires through the collection and monitoring of residual current, overcurrent, overvoltage and temperature signals. It is a new generation of electrical fire monitoring products applied in the dual fields of civil buildings and industrial buildings. The device is tracking the latest development direction of international electrical fire detection and alarm technology, and combined with domestic applications in industrial fields and civil buildings for many years. The electrical fire detection and alarm products were successfully developed on the basis of a lot of valuable experience accumulated. It is suitable for smart buildings, high-rise apartments, hotels, restaurants, commercial buildings, industrial and mining enterprises, key national fire protection units, and petrochemical, cultural and educational health, finance, telecommunications and other fields. 
1.1 Basic principles
Its working principle is to monitor and manage the fire hazard parameters such as leakage current, overload current, overvoltage / phase loss, and line temperature rise of the distribution circuit and power supply line through intelligent and digital network monitoring technology. Once the power supply line leaks. When overload, short circuit, overvoltage, phase loss, overheating and other signals exceed the set value, it can quickly and accurately send out audible and visual alarm signals, indicate the alarm location, record the alarm time, and display the alarm type, so as to prevent the electrical fire.
1.2 Basic composition
Acrel-6000 electrical fire monitoring system adopts layered distribution and open structure design, which is composed of station control management layer, network communication layer and field equipment layer. Each electrical fire monitoring detector is connected to the communication server through the shielded twisted pair RS485 interface, using the MODBUS communication protocol bus type connection, and then enters the industrial switch through the five-line TCP / TP protocol, and then reaches the monitoring host through the optical cable. 
2. System design and application
2.1 Schematic diagram of typical networking scheme
a) Large-scale building group network solution
Large building complex with high floors and scattered buildings. It adopts Acrel-6000 / Q electrical fire monitoring equipment + Acrel6000 / B electrical fire monitoring equipment + electrical fire monitoring detector three-layer structure networking mode, which is convenient for regional management. It adopts RS-485 network communication and Ethernet communication to satisfy the communication. High real-time requirements. 
b) Large single building network solution
Large single building, adopts Acrel-6000 / Q electrical fire monitoring equipment + electrical fire monitoring detector two-layer structure networking mode, comprehensive monitoring management function, high cost performance, adopts RS-485 network, communication medium uses shielded twisted pair, It meets the requirement of high real-time communication. 
c) Networking solution for medium-sized buildings
The medium-sized single building adopts Acrel-6000 / B electrical fire monitoring equipment + electrical fire monitoring detector two-layer structure networking mode, which is economical in cost and cost-effective. It adopts RS-485 network to meet the requirements of high real-time communication. 
d) Small building electrical fire monitoring system
Small buildings are monitored by Acrel-6000 / B electrical fire monitoring equipment, which is economical and cost-effective. 
2.2 Application of system in architectural design
Ankerui Electric Co., Ltd. undertook the residual current type electrical fire monitoring system of Anting station plot of Line 11 in August 2011. The project is divided into A1, A2a, A2b, A3, A4 and A5. 196 ARCM200-J1 residual current electrical fire detectors were installed. The detector forms a fire monitoring system through the RS485 bus and the electrical fire monitoring equipment in the duty room of the monitoring center. It uses Acrel-6000 electrical fire monitoring equipment, which has the functions of centralized dispatching, control, protection, monitoring, display, etc. The advantages of intelligent analysis and recording in one body can greatly reduce the incidence of electrical fires in applications. 
The system mainly realizes remote measurement, remote adjustment, remote control and remote signaling of 196 detectors scattered in the building, which is convenient for monitoring and management; monitoring leakage current and overcurrent signals, sending out sound and light alarm signals, and reporting the fault location, Monitor the change of fault point and store various fault signals; display and alarm accordingly according to the type of signal provided by the detector, including alarm signals for opening / closing, residual current fault, overcurrent fault, voltage fault or temperature; with self-test Function to check the short circuit and open circuit of the communication line.
3. Selection plan
Main meter function and selection plan 
4 Conclusion
The electrical fire monitoring system is a part of building fire protection and plays a very important role in preventing electrical fires in the early stage. Ankerui is competing for the development of the fire industry, constantly breaking through itself, independently developing and updating products, and contributing part of the protection of the national and people's property. In the future development, Ankerui will take the essence of the trend development requirements and create more excellent products!
references
[1] GB 50045-95. Code for design fire protection of high-rise civil buildings (2005 edition)
[2] GB 142867.1-2005. Electrical fire monitoring system Part 1: Electrical fire monitoring equipment
[3] GB50016 2006 Installation and operation of residual current action protection device
[3] Ankerui Electric Co., Ltd. product selection manual 2013.11 edition.
================================================== ================================================== ======
Contact QQ
Grinding Heads,Cbn Sharpening Stone,Brazing Diamond Drilling Tool,Flexible Polyurethane Grinding Head
Henan Jinlun Superhard Material Co., Ltd , https://www.jlsuperhard.com