Chapter 1 Introduction 1.1 Overview scene in bulk materials handling systems in the material handling unloading silos among different process called discharge or cloth. Fabric is key equipment unloading car (also known as unloading trucks, cloth car, mobile reversible conveyor, reversible belt conveyors, belt conveyors reversible with warehouse, distribution warehouse reversible mobile belt conveyors, shuttle fabric machine), its role is in the feed material in the conveying belt system on the specified unloading silos in order to achieve a different silo unloading car can give different material unloading, unloading car needs along feed belt running direction of running back and forth positive and negative directions. Former iron mine in the system, raw materials, sintering, pellets, coke, iron and unloading car ports will be used to discharge, although different conditions, but the location of the discharge detection is the key part of the car, will have a direct impact on product quality and work efficiency. Such as the ports are at the top of a large bulk storage installation orbit belt conveyor installation, when the finished product is not directly solid particulate loading, can be transported by belt conveyor to feed port unloading car, then run along the unloading car Track finished solid particles evenly spread in the warehouse for storage of bulk materials; unloading trucks through precise position control to achieve more uniform fabric, thereby increasing storage capacity, creating economic benefits. Iron in the steel production process before the link you need to make different kinds of mixed materials, precision steel silo fabric affect the quality and efficiency of the discharge through the efficient and accurate automated control car can reach the iron before scientific product quality requirements, and to improve production efficiency, improve operator working environment. 1.2 Currently used positioning control is the most primitive of the car along with the mobile operators are now using manual controls unloading car to achieve the silo discharge, post operator by the human eye observation of each silo material level, According to the car needs to be open to a reasonable silo discharge. Secondly unloading car control mostly through the limit switches at each bin, the signal provided by the position of several points in the operating room for remote control; of the trolley to the target position and for positions based upon a operating table positions indicator lights: for example, a total of 12 # -12 # set the corresponding positions on the 12 position indicator on the console panel. The signal lights are next to each warehouse at the scene by the installation of one or more proximity switch (or limit switch) to get. When the car through the positions at the limit switch or proximity switch, switch to sense a signal sent to the control room, so that the corresponding positions of the lights, the operator will know the car reached the target positions, press the stop button that conduct discharge , level signal which indicates that the control room operator to control the warehouse after the expiry of the car continues to run left or right until you reach the corresponding target positions, bright lights and then stopped to cloth, in order to achieve the purpose of changing positions. The traditional limit switches used in this way will appear the following issues: first easy failure, proximity switches or limit switch works determines its poor reliability. Second, because of the occurrence of the braking car "slide car" phenomenon, are not allowed to stop. So once the car is not parked in the exact limit switch installed (slip occurred car), all lights in the control room operating table without a change in light, so it appears we call "car position lost" the control staff do not know what position the car in the end, and then you need to send people to the site to confirm the location of the car to inform the control, the control can continue to run the car to reach the target position. Impact of these problems on the control and production brought summarized as follows: unloading car is discharged directly into the feed silo, due to the positioning of the denial or failure (especially in the event of the car slip if the operator is not strong sense of responsibility, yet to come site to confirm location, and more prone to night duty) easily lead to the wrong bin blender accident, directly affect the stability of the ingredients, resulting in substandard quality; throughout the continuous production process is often interrupted, not only affects the efficiency of production, and actual operating rate of the device is very low, you can not realize the whole process of information technology and efficient operation; after failure need dedicated staff to the scene to confirm the location of the car, the frequent exchange of information between the observers sent to the scene with the operating room operator primarily through walkie-talkie to pass, because the scene of serious noise, by the call quality, on-site environmental and other factors, it is difficult to ensure the accuracy of information transfer. One can easily lead to an accident, and secondly no reason to spend a lot of working time; when operating personnel to operate the unloading small car in the control room, the presence of observers of the scene is always a security risk. If the mutual cooperation between the operator and field errors observers, there casualty events that may occur; poor discharge site environment, dust and noise seriously affecting the health status of the operator, not long-term someone on duty at the scene; the control room can only sense the position signals of several points in the control room can not be achieved on the field of long-range monitoring function; for positioning, in the control room scheduling needs time to keep in touch with the post operator to determine the site of the discharge, the conduct overall planning and scheduling. In control and on-site communication between each other to take up a lot of time and work to improve the overall rate of the equipment brought a lot of inconvenience; limit switch failure may also result in a collision at both ends or unloading car off road accidents. To solve these problems sound must do two things: first, the location of the signal to be reliable and accurate, but also to be able to work reliably in the field of strong dust environment. Second, the control should be able to run down the track the car tracking and monitoring, very intuitively know the car is currently located silos position coordinates and the corresponding bin (if perturbation of the head could not guide the operator to monitor tens of meters long identify exactly the same position). This means that if we know the absolute position coordinates successive car scene, you can very well do both. 1.3 positioning technology system uses the system uses precise positioning ruler scale technology to detect real-time location unloading car will deliver real-time location information to the car unloading system PLC, and then to the PC, the master operator or staff positions through PC unloading car always grasp the specific location and circumstances of each silo storage capacity (combined level meter) to control the operation of unloading the car. By working together scale ruler precise positioning and control systems can achieve accurate and reliable unloading trolley travel position, the material on the belt in the designated unloading silos to prevent deviation from the discharge port to achieve point or multi-point fabric, meet discharge requirements. By using this technique, you can always grasp the actual quantity of each silo, understand the real-time location of unloading the car, automatic point or multi-point uniform discharge. Improve discharge efficiency and cost savings; helps to reduce labor intensity, protect the health of the operator positions; to prevent the occurrence of various types of production safety accidents and mixing the wrong positions, such as the quality of the accident; effective collection of information will help improve equipment work rate; increase the level of automation and information management level to ensure yield and quality, enhance corporate image, enhance corporate value and competitiveness. Chapter 2 scale ruler precise positioning system 2.1 scale ruler scale ruler brief description of the system to pinpoint system includes a ground electrical cabinet (including scale analyzers, etc.), an onboard electrical cabinet (including scale generation instrument, etc.), scale ruler and tour ruler pointers. Scale ruler which is made of PVC wire flat synthetic material shell material and the internal laws of the preparation according to Gray code structure, similar to a graduated scale, usually installed in the locomotive moving along the side of a single orbit, or laying along the running track On the ground, or will be installed on the fence post beside the track can be, how long it needs to detect displacement laying on how long scale ruler; vernier pointer mounted on the locomotive, a location where the identification of the locomotive. Vernier scale ruler pointer relative movement parallel non-contact, vernier scale that is a pointer to the current position value, you can get the amount of displacement in the car or on the ground, without the initial reference point, positioning accuracy 5 mm, 2 mm resolution; can break continuous or continuous detection, especially for rail carts or uneven mechanical displacement detection circular motion. Waterproof, oil, dust, acid, used in metallurgy, mining, water, port yard, warehousing, chemical and other conditions are harsh environments. 2.2 System Principles scale ruler scale ruler precise positioning system using electromagnetic induction principle to detect the amount of displacement of the mobile device, when vernier pointer coil pass into alternating current, in the vicinity of vernier pointer produces an alternating magnetic field. Approximate scale ruler in an alternating magnetic field evenly distributed, each of scale ruler wire will be induced electromotive force. Scale instrument signal to generate the scale ruler induced by electromagnetic coupling loop. Scale analyzer signal received phase comparison. Signal phase with the phase of the signal line intersecting parallel lines of the same address is "0"; cross-line phase of the signal phase of the signal lines opposite and parallel to, the address is "1", so that the induction of the Gray code address information is arranged, whereby determine the position of the pointer on the vernier scale ruler in the longitudinal direction. 2.3 scale ruler technical indicators moving locomotive Address Accuracy: ≤5mm, Resolution: 2 mm, measuring range: any customization; Working temperature: System Operating temperature: -20 ℃ - + 70 ℃, scale ruler Working temperature: without protection sets: -40 ℃ - + 85 ℃, plus fire sets: -40 ℃ -600 ℃, high temperature heat for about 80 seconds; non-contact gap: 150mm ± 50mm (according to need up to 500 mm), left yaw tolerance difference: ± 50mm; Weight: Weight scale ruler: 1.5Kg / m, Dimensions: 100mm × 10mm × length; vernier pointer Weight: ≤2.5Kg, Dimensions: 400mm × 400mm × 30mm (special can be customized); communication error rate: <10-7; refresh rate: 20HZ; adaptation speed: ≤350M / min; standard signal output: RS232 / RS485, scalable other signals; signal transmission distance: ≤1200 m (485 signal output); scale ruler and vernier pointer Protection class: Ordinary IP67, the highest IP69 (underwater work); Input Power: 220VAC ± 10%; power: ground electrical cabinet <100w board electrical cabinet <100w. 2.4 scale ruler scale features in the system to generate instrument (and function signal generator) address of the carrier signal emitted by a certain period, the vernier scale ruler pointer transmitted to the ground station scale analyzer receives the signal, decode restore the locomotive located at absolute address scale ruler, after processing the output from the controller RS232 or RS485. Wear-free non-contact position sensing, long life; can be intermittent or continuous testing, ranging up to 2 km, the length of the displacement detection can be customized; resistant to pollution super capacity, available water, Steam, resistance pH; easy to install and replace (without changing the environment of the scene), maintenance-free; high stability, high reliability, multi-signal output mode selection; with reverse polarity protection, anti-lightning, anti-RF interference, anti-static ; no displacement of the absolute output reference point, not afraid brownout; sampling and measuring the length of time the location does not matter; can be used in circular motion mechanical position detection. Scale ruler can be buried in the concrete floor, easy installation and protection, without affecting the working environment. 2.5 scale ruler single set of equipment diagram (one-dimensional detector) 1) automotive subsystems: the vernier pointer, automotive electrical cabinet (containing scale generation device, the switching power supply, etc.). 2) ground subsystems: the ground electrical cabinets (containing scale analyzer, switching power supplies, gateways, rulers lead converters, etc.). 3) scale ruler subsystems: the special scale ruler, CN box, EN boxes, cables and a variety of ordinary ruler for scale installation, fixed, protection agencies. Exhibit 2: Schematic diagram of a one-dimensional detection system Chapter 5 system to achieve real-time detection features unloading trucks current position, that is the position in which the (slot) recognition; multi-point uniform fabric (cutting), to improve storage capacity utilization; accurate operations, streamline business processes, reduce manual error probability; to prevent the wrong bin blender, deviation accident occurred when the discharge port discharge; in accordance with the process and the level meter, which enables remote control, semi-automatic, fully automatic operation; realization of the production process computer management, remote monitoring, production status stored queries; protect the health and safety of workers; can improve efficiency and production management level; prolong the life of unloading trucks. Position interlock control to prevent cutting or fall over the limit position collision / derailment accident. Chapter 6 System main application areas for bulk material handling environments material handling equipment. Systems such as mining, metallurgical, port systems, chemical systems, power systems, cement systems, light systems, building systems, military systems, mechanical systems, rail transportation equipment precise positioning and automatic control, such as: GOK mine discharge car positioning, sintering machine finished unloading the car positioning system, finished sinter ore trough moving cloth car positioning system, finished sinter ore bin unloading car positioning system, sinter mix batching system unloading car automatic positioning systems, grate - kiln Engineering unloading car automatic positioning systems, fuel sintering crushing chamber works on warehouse unloading car positioning system, the firing chamber and mix the ingredients engineering warehouse unloading car positioning system, mix the ingredients trough unloading car positioning system, Ore bin job Online belt unloading car positioning systems, pellet plant discharge system of environmental protection and comprehensive raw field engineering unloading car automatic positioning systems, plant materials for -2A, 2B unloading car automatic mixing batching system, tank unloading mine blast Smart car feeding system, mine shafts operating line moving car cloth fabric control system, coking coal preparation system with conveyor unloading vehicle position detection system, the fuel feed system ironmaking raw coke unloading vehicle positioning, sintering unloading trucks positioning and unloading ore pellets and miscellaneous vehicle positioning, position detection conveyor unloading the car, on the coal storage silo unloading car three point discharge system, port storage silo discharge system, automatic kiln car unloading systems.