Introduction

Introduces one kind of new liquid chlorine cylinder scale fixed value filling mode, uses the electronic label cylinder scale touch screen, the bus communication touch screen, the wireless network database and so on, the automatic filling machine realizes the liquid chlorine cylinder scale over-use or the over-period has not been examined the automatic examination, the liquid chlorine automatic fixed value filling, the steel liquid chlorine bottle archive management and the flow management, greatly reduces the human factor influence, the work efficiency and the safe production coefficient, has improved. It improves the management level of steel and liquid chlorine bottles. Liquid chlorine is an important raw material for production, but also toxic, harmful, corrosive hazardous chemicals called in the liquid chlorine cylinder scale filling link there are some outstanding problems, mainly manifested as follows.

(1) Before and after filling, there is no necessary inspection of steel liquid chlorine bottles;

(2) In the filling process of the filling amount of control is not qualified, overfilling phenomenon still exists;

(3) Filling of steel liquid chlorine cylinders that have exceeded the service life, steel liquid chlorine cylinders that have not been inspected for a long time, steel liquid chlorine cylinders that have not been registered for use, or other unqualified steel liquid chlorine cylinders, and so on. From the current statistics of liquid chlorine cylinder scale accident causes, but also mainly focused on these aspects.

Liquid chlorine is a chemical used in the chemical industry to sterilize and treat water. If the amount of liquid chlorine added in water treatment is not properly controlled, it will cause greater harm to the water quality and social environment. At present, the domestic requirements for drinking water are getting higher and higher, which puts forward high requirements for the chlorination of water companies. Water companies in the process of water treatment in the control of liquid chlorine has a very important role in the control of the amount of chlorine, which directly affects the quality of water. At present, China's large and medium-sized cities water plant chlorination weight measurement control, most of the lever-type mechanical scales, mechanical scales in the use of a period of time after the measurement will not be allowed or mechanical failure, at the same time, due to the proximity of the operation will affect the health of the site operators. For this situation, some larger water plants use 2t ~ 3t steel liquid chlorine bottles on the ground scale, but because of the high price, and the trouble of civil construction, large investment, and inconvenient operation. According to the above situation, for the use of liquid chlorine preparation for sterilization of enterprises, such as chemical plants, water companies, etc., the design and development of the development of liquid chlorine bottles for chlorine in the liquid chlorine storage volume of measurement and control of special electronic scales: liquid chlorine, steel liquid chlorine bottles of electronic scales measuring device. It adopts the frame structure of the scale body, the scale surface is stainless steel structural parts, the scale frame for multi-layer anti-corrosion treatment, corrosion resistance, easy to flush. The weighing liquid filling machine is composed of high-precision weighing module and intelligent weighing display instrument, which is highly accurate, stable and reliable.

Process Control

Cylinder scale discusses the design and working process of a liquid chlorine filling machine with PLC as the control part in Siemens S7-200 series. By the data acquisition module, controller module, human-computer interface module. Among them, the data acquisition module consists of Toledo weighing module and A/D conversion part. The main hardware refers to the PLC as well as the expansion of the analog module of the input and output devices and other parts. The software part describes the control filling flow chart, filling process control and so on.

Through the research and design of this filling machine, it is able to carry out the automatic filling function of liquid chlorine and meet the requirements of this design. Chemical production process involves the measurement and control of the amount of chemical raw materials and products, for the chlor-alkali production process requirements, the production process of liquid chlorine as a product to be supplied to the outside or trade settlement. In the liquid chlorine supply measurement needs to be filled with special liquid chlorine liquid chlorine bottles, according to the liquid chlorine steel liquid chlorine bottles tare weight, need to be filled with the actual weight through a set of automatic metering and control devices to achieve. In order to design a suitable, reliable, economical quantitative filling machine, not only to ensure that in a variety of harsh environments for a long time to work normally, but also to adapt to rapid assembly line production and can ensure that it can achieve the sex of the higher packaging precision quantitative control, to build a PLC-based dynamic quantitative packaging control system. The touch screen is used as the upper computer for remote monitoring, and a well-designed weight indicator is available for users to use. It also has on-site control cabinet operation mode for on-site commissioning and operation. Comprehensively familiarize with the process of liquid chlorine steel chlorine bottle filling, master the automatic measurement and control in the index requirements, through the design of the configured hardware components, the preparation of software programs to meet the automatic measurement and control requirements.

Cylinder scale is based on Siemens PLC200 series as the core of the control of the automatic filling machine, through the Toledo electronic scales for real-time measurement of the weight of the material, in the data acquisition and processing, with a touch screen as the host computer, constructed a user-friendly weighing display. The final design of a set of eight filling lines can be realized on the automatic measurement, automatic control of PLC hardware, and the realization of the weighing instrument display, alarm, data processing and other functions. Liquid filling machine hardware consists of eight liquid chlorine filling containers, these devices to achieve the function of automatic filling, in the weight judgment of liquid chlorine, in the Z-axis is installed with a weighing module to determine whether the liquid chlorine is full or not. XYZ-axis mechanical arm is driven by three servo motors, servo motors have the advantages of high precision, as well as high torque and high anti-interference in order to replace the stepper motor. Servo motor control by Siemens 200 series PLC servo positioning module EM253 drive, the host by the S7-226CN as the main processing unit, the working process of liquid filling, the first through the upper liquid filling machine HMI set up each loading container loading quality, press the start button after the robot arm in accordance with the upper filling instructions to move the XYZ-axis in order to arrive at the specified container, open the liquid discharge valve, through the PLC, the liquid discharge valve. Open the liquid discharge valve, through the PLC on the high-precision weighing module process liquid calculation to reach the set value after the closure of the liquid discharge valve, the mechanical arm to move to the next container, until the end of each container filling, the entire workflow.

Conclusion

Field operators use portable wireless label recognizer to scan gas-liquid chlorine bottles, which makes steel liquid chlorine bottles in storage, filling, and out of storage more reliable and efficient; through intelligent filling control to make judgment and identification of defective steel liquid chlorine bottles and overdue steel liquid chlorine bottles, it effectively avoids safety accidents of steel liquid chlorine bottles due to operator's negligence and wrong judgment; real-time monitoring of information of steel liquid chlorine bottles in storage and steel liquid chlorine bottles outflow and Real-time monitoring of the information of steel liquid chlorine bottles in storage and outflow of steel liquid chlorine bottles, and the formation of information reports for decision-making by managers, which helps to reduce the phenomenon of steel liquid chlorine bottles overdue for service and overdue for return; network access to the touch screen makes it possible to share data, remote query and analysis support, so that the supervision of steel liquid chlorine bottles can be implemented in a wider range. Informatization tracking management of steel liquid chlorine bottle, improve the safety management level of liquid chlorine filling, effectively prevent and reduce the occurrence of steel liquid chlorine bottle safety accidents. The backward manual filling and management mode is being gradually eliminated, and the application of advanced cylinder scale touch screen to improve the filling and management level of steel liquid chlorine bottles is not only the requirement of safe production and safety supervision, but also an inevitable trend to improve and enhance the management level of enterprises.