Automation transformation of the hottest productio

2022-08-07
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Automatic transformation of production line (I)

in order to occupy a leading position in the fierce dairy market competition, a dairy manufacturing company decided to adjust its molding shrinkage rate to 3.1 (7) 7% of the existing operating equipment will be expanded and transformed. The success of this automatic system transformation makes it a modern dairy enterprise in Asia and even the world

in order to occupy a leading position in the fierce dairy market competition, a dairy manufacturing company decided to expand and transform its existing operating equipment. The work of this automation system transformation includes: expanding the systems of two raw milk collection production lines, transforming and increasing the milk transmission process pipelines of the standardized workshop, adding two milk purifiers (separators), adding mixing and storage tanks, so as to improve the capacity of the whole standardized production workshop, and correspondingly increasing the CIP cleaning lines

the basic guiding ideology of this transformation: we should not only adopt the popular automatic control technology, but also make full use of the PLC-5 programmable controller currently used, and at the same time, we should not affect the normal production, so as to achieve undisturbed switching

according to the structure, design experience and actual process control requirements of similar systems at home and abroad, the control system adopts the controllogix5550 DCS system of Rockwell Automation Company. Including the detection, setting, indication alarm and adjustment control functions of the process parameters of the tank car milk collection - milk purification and separation - finished milk transfer and preparation - service system (refrigeration and CIP)

the system adopts Rockwell Automation three-level network, and the information layer adopts Ethernet to realize system data exchange; In the middle, the control layer (ControlNet, dh+) is responsible for system communication; The bottom layer is the equipment layer, which is connected with local equipment, such as valve box, frequency converter, etc. It lays a foundation for improving production efficiency, optimizing process, reducing cost, analyzing various operations and safe production

process control computer composition

the system is composed of 4 sets of ControlLogix and 2 sets of PLC5, 2 computer operation stations, 1 engineer station and a server through the network. It mainly completes the collection and storage of fresh milk, the cleaning of milk tanker (CIP tanker), milk purification and separation, the proportion control of various milk products in raw material tanks in the wet area, and the cleaning of standardized production pipelines and transfer storage tanks (CIP spring fatigue testing machine shall be properly grounded to hot, CIP cold), so as to prepare for the production of milk powder in the dry area

the engineer station can program, configure, download and debug the software on any PLC control station through the network

the operator station communicates with the PLC system through the Ethernet network to realize the monitoring function of the production process. Since the two operator stations are connected to the Ethernet, the division of labor control can be realized and the other one can operate on its behalf in case of fault

the server is installed with Rssql and MSSQL software, which can collect the data of each operation station. After processing the data as required, it can realize the rapid and large amount of data exchange with the upper computer for the next operation

system function: the whole system function realizes the process control from the beginning of milk collection to the end of raw milk powder proportioning in the wet area of the dairy factory. These include: milk collection, milk purification, standardization and CIP cleaning. The sequence control technology is adopted in the program design. The program is implemented in strict accordance with the process design steps, and the status of each valve and pump is detected in real time. In case of failure, the program will generate an alarm signal, and interlock the relevant valves and pumps to ensure the safe operation of the system

1. The milk collection plc

measures the income of the fresh milk transported by the milk tanker of the five milk collection lines. Each milk collection pipeline has a terminal display operator PanelView on site. The settings of each step of milk collection operation are carried out through the PanelView, including the tanker number, contract number, etc., which are sent to the PLC for backup through DeviceNet. The fresh milk is stored in the fresh milk tank after the cold exchanger

2. The milk purifier plc

performs milk purification, separation and sterilization control on raw milk according to different product requirements as raw materials for standardized production. The process setting of the milk purifier is mainly composed of five parts: startup, preheating, circulation, production, CIP (cleaning in place), etc. The milk purifier PLC completes the process control of four milk purifiers (separators). Under these five states, it includes the control of feeding and discharging valves, the setting and control output of slag discharge time, and the adjustment control of balance tank

3. Standardized plc

according to the formula requirements of milk powder products, set the metering configuration of different raw materials in the standardized workshop, and select the pipeline combination for equal transmission. According to the process requirements, cooperate with CIP cold (hot) to start the relevant pipeline valves and pumps, and complete the pipeline cleaning

p tanker company 1 has always adhered to the technology led plc

to complete the cleaning of milk delivery tankers. The process includes cleaning liquid alkali tank, clean water tank, circulating water tank and valves and motors on corresponding pipelines. These three tanks serve as the power source for tank car cleaning on five pipelines. Each milk collection pipeline is provided with a PanelView on site. Each step of CIP tank operation is set through the terminal display operator PanelView, which is sent to PLC through DeviceNet to complete the control of valves and pumps related to each step of cleaning operation. It mainly controls the cleaning of the milk tanker of the five milk receiving lines, the automatic tank replenishment control and the liquid level detection alarm. Carry out real-time fault detection for the state of the valve and pump, and take different control operations for the valve and pump in the CIP process according to the type of fault

p cold (hot) sta recently, many customers have asked what kind of machine to buy for the seat belt tension testing machine ion

fresh milk, skimmed milk cans and pipelines should be cleaned with CIP cold; The cleaning of cream tank and pipeline requires higher temperature water and cleaning agent. CIP hot is adopted, and the process is basically the same as that of CIP tank PLC. The four tanks are used as the cleaning power source for the five groups of combined pipelines, but the number of pipelines that need to be cleaned is relatively large. According to the different standardized transmission and milk collection pipelines, each group is composed of multiple pipelines. The CIP cold (hot) station communicates with the milk collection PLC and the standardized PLC to complete the cleaning of pipelines and tanks, and to switch the relevant pipeline valves and pumps. Plc5-/40 and plc5-/60 are used for PLC

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