Design and Research on Verification Control System of Water Flow Meter

Abstract: The design and research information of the water flow meter verification control system is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Abstract: In the past, the water flow meter verification system was mainly controlled by manual and semi-manual methods. The disadvantages were low verification accuracy, large flow fluctuation, small caliber range of verifiable meters, low degree of automation, and low meter inspection efficiency. This article is based on water flow meters. More flowmeter manufacturers select models and price quotations. You are welcome to inquire. The following is the design and research article details of the water flow meter verification control system. In the past, the water flow meter verification system was mainly controlled by manual and semi-manual methods. The disadvantages were low verification accuracy, large flow fluctuation, small diameter range of verifiable meters, low degree of automation, and low meter inspection efficiency. In this paper, according to the technical requirements of water flow meter verification, combined with the working conditions of the original verification system, and according to the design specification of the automatic control system of the Ministry of Petroleum and Chemical Industry, the water flow meter verification control system is designed. The control system takes computer and frequency converter as the core, realizes automatic control in the true sense, reduces the labor intensity of workers, improves labor efficiency, can complete a full range of water meter verification tasks, greatly saves verification costs, and ensures normal production. . 1. System composition The core of the system adopts the distributed control method of upper and lower computers. The upper computer adopts Advantech's high-quality IPC industrial-grade computer and is equipped with a 21' large-screen monitor. It is mainly responsible for system management tasks, such as various data and signals. Detection, storage, analysis, calculation and processing; display and retrieval of various process graphics, screens and curves; viewing and monitoring of various events, fault alarms, records, certificate review and printing, etc. The lower computer adopts the programmable industrial control produced by Japan's OMRON company The realization of all control tasks of the system, the execution of actions, and the output of control modes are carried out by the lower computer PLC. As the control center, it continuously exchanges various data and information with the upper computer at a very high frequency. System control. The whole verification system is divided into system control part and on-site inspection execution part, and the two parts are connected by cables. 1.1 System control part The system control part is divided into five parts, as shown in Figure 1. (1) The central console (system control cabinet) of the whole system includes an Advantech IPC-586 industrial-grade computer, a 21' large-screen monitor, a DPK-8400 receipt printer, a set of OMRON200H programmable logic controller PLC, 11 distributors, 6 switching power supplies, 10 air switches, 3 AC contactors, an alarm, a signal conversion processor, a set of four-way isolation relays, a frequency adjustment potentiometer and 30 buttons and indicator light. (2) The power supply and output signal wiring of the tested meter, as well as the operation cabinet for sending data without the meter, is located at the verification site, and is equipped with a film operation panel, a digital display tube, a ready button and indicator light, an emergency stop button, a power switch, Pluggable control buttons and wiring cables. (3) The solenoid valve cabinet is equipped with 8 solenoid valves and 4 relays, of which 4 solenoid valves control the switches of the bottom valves on the 4 standard tanks on site respectively, and 2 solenoid valves control the reversing of the two commutators. . These 6 solenoid valves can be automatically controlled by computer and manually controlled by buttons on the control cabinet, and each button is stuck with a sign to avoid misoperation. The other two solenoid valves are one for backup, and the other controls the switch of the pneumatic drain valve on the DG200 pipeline. 4 relays provide the switch status of 4 bottom valves to the host computer. (4) Inverter cabinet The cabinet is composed of 175kW inverter, anti-interference reactor, intermediate relay, air switch, AC contactor and other electrical components. Its main function is to realize the frequency conversion start and stop of the motor. The start and stop of the frequency converter are divided into two working modes: automatic and manual: when the frequency converter works automatically, the upper computer automatically selects the motor to be started, and the lower computer sends the frequency control signal to the frequency converter according to the flow point set at the time of verification. ;When the frequency converter needs to be started manually, at the scene“Manual / Auto”When the control button is set to the manual working mode, it can be realized by adjusting the frequency adjustment potentiometer on the inverter cabinet, and the manual frequency adjustment can be realized through the conversion button on the system control cabinet to realize the remote operation between the field and the control room. At the same time, the frequency conversion cabinet is also equipped with a liquid level relay that controls the water tank of the vacuum pump. (5) Electrical control operation cabinet The operation cabinet is composed of four power distribution cabinets. Its main function is to supply power to five motors in the pump room and to realize manual frequency conversion and power frequency start on its operation panel; the operation panel is equipped with“Manual / Auto”Transfer switch, 15 start and stop pumps, and 26 status indicators. 1.2 On-site inspection execution part The on-site inspection execution part consists of a standard meter, an inspected meter, a frequency converter, a standard tank, a commutator, and a water pump group.

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