The selection of the phase-measurement and relative zero-phase sensor allows for a single function. It is not necessary to select an eddy current sensor. A high-frequency response proximity switch can be used. Only switches with two states ("0" and "1") are required. The quantity can meet the requirements, and the selection frequency is 300-400 Hz; the output current is 0-100 mA and the connection is installed at the joint. It is converted into a voltage signal by the subsequent circuit and sent directly to the signal collector. In addition, the industrial computer selects 586 computer, other accessories (such as display, printer, mouse, etc.) are not required.
System function overview development environment: Chinese WINDOWSNT operating platform; development language: VisualBasic3.0 or above; human machine interface: multi-graphics window; operational links between functional blocks: event-driven; main operation method: use mouse pointer selection The keyboard is only used to modify the indication and return the fault category and characteristics of the diagnosis. With the timing sampling as the event, the driving function module (window) runs automatically and continuously. The software of the system is closely combined with the hardware configuration to ensure that the fault can be detected early and prevent the problem from happening before, so that the equipment can work reliably and effectively, and ensure its safe operation and improve. The economics of maintenance.
(1) Independently analyze and judge the performance of the equipment and the fault state with the objective state measured by each measuring device, and make a judgment decision at the same time. For the operation, it is hoped to find and diagnose the rotor system failure, such as rotor imbalance, misalignment, looseness, etc.; vibration caused by rolling structure; vibration caused by bearing damage; and abnormal vibration caused by synchronous motor control. The indicated rolling bearing and rotor faults are divided into two different frequency segments, and it is necessary to set two sampling frequencies. The synchronous speed of the system is n=1470r/min, the fundamental frequency is 1470/60=24.5Hz, and the fundamental frequency of 5 times is 24.5×5=122.5Hz. Therefore, the analysis frequency f is =125Hz, and f is 1=2.5f. That is, f is 1=2.5×125=312.5Hz. Because it needs to be equally divided, it takes 350Hz as the first gear. This file can analyze the fault of the low frequency part of the system. For the analysis of the natural frequency range of the rolling bearing component fault firing, then f = 2 = 2.5f minutes / 2 = 155Hz. (2) The system monitors the running parameters and waveforms on the synchronous motor and excitation control online, such as: excitation voltage Vf and Waveform Vf(t); stator voltage VD and waveform VD(t); excitation current If and waveform If(t); stator current ID and waveform ID(t); control piece pulse waveform (3-way conversion). The comparison of parameters and waveforms reveals the trend of failure, promptly issues early warning signals, ensures the normal operation of the synchronous motor system, and can record the historical record, which is also beneficial for the operation of the synchronous motor.
System operation and effect
System operation The system is successfully applied to the sintering main exhaust fan with the strong support of the relevant units, and its functions are continuously improved according to the actual needs of the production, and the parameters are appropriately adjusted. After more than a year of operation, it has been proved that by picking up the vibration signal of the bearing housing or the shaft itself, it is possible to monitor not only the change of the vibration amount during the operation of the equipment, but also the rotor imbalance, the misalignment of the joint, the bending and cracking of the shaft, the bearing failure, etc. A multifaceted signal. Monitoring through the computer screen can further determine the performance, degree, category, location, cause, development trend, etc. of the fault, and make judgments so that many early faults can be detected and processed in time. For example, in November 2000, the monitoring system was used to find a bearing crack failure of a fan, and timely measures were taken to avoid a major equipment accident.
Effect After the system is put into operation, the equipment failure of the main exhaust fan is greatly reduced, the operating rate of the sintering machine is increased by 2.5 percentage points, and the annual output of 1.2 million tons of sintered ore is calculated, which can create a profit of 800,000 yuan, plus annual reduction of repairs. And other expenses such as spare parts, 400,000 yuan, the annual economic benefits of 1.2 million yuan.
(1) The system has been successfully applied to production. After more than one year of operation, the system is stable, reliable, and has a low failure rate. The performance indicators meet and exceed the original requirements.
(2) Due to the limitations of equipment and technical conditions, the natural frequency and some related parameters of the system have not been determined, and the selection and configuration of the instrument have yet to be further improved. Software development With the development of computer technology, vibration and electrical parameters should be better tracked dynamically. Although the cost of cooperation in Xiangtan has been decreasing year by year, the quality of coke has not decreased. This not only meets the needs of blast furnace production, but also achieves cost reduction and efficiency. Xianggang has an annual output of 0.82Mt of coke, and a ton of coke needs about 1.393t of coal, which is 25% of coking coal, 15% of fat coal, 20% of lean coal and 40% of coke coal. The coal price is 353.8 yuan/ t, compared with 1998: coking coal 31.4%, fat coal 21.3%, lean coal 18.9%, 1/3 coking coal 28.4%, can reduce the cost of 2.4 yuan / t coal, a year can reduce the cost 1.393 × 0.82Mt × 2.4 yuan / t =274.14 (ten thousand yuan); at the same time, due to the improvement of coke quality, the iron-making ratio has been reduced, the pig iron output has been increased, and the economic benefits of iron making are also considerable. The economic indicators of Xianggang blast furnace have been continuously improved. For example, the coke ratio has dropped from 560kg/t in 1998 to 440kg/t today, and the coal injection ratio has increased from about 80kg/t to about 100kg/t.
Linear vibrating screens are used to clearly separate all manner of different fractions. Or in technical jargon: Materials are classified accurately.
Thus, in accordance with the standard screening principle, ore, coal, coke sinter, pellets or rocks, for instance, are screened and clearly separated in very large quantities. Linear vibrating screens, which can be specially adapted to the tasks, are critical here to achieving high and consistent quality.
Shenyang SANLAND already provides linear screens in standard format in a variety of designs. For example as single or multiple-decks.
The applications are wide-ranging. Linear vibrating screens are used in the pit, quarry, coal, ore and steel industries.
Linear Vibrating Screen,Horizontal Vibrating Screen,Terex Horizontal Screens,Small Vibrating Screen
Shenyang Sanland Mining Equipment Manufacture Co., Ltd. , http://www.sanlandcrusher.com