Operation, after on-site inspection and verification, the computer accuracy rate reached 99.95%, the operation is stable, and it has been put into production and use.

According to the urgent requirements for accurate metering of finished soda ash packaging in our factory, this set of “packaging computer industrial control metering system” was designed and installed for 600,000 tons of soda ash packaging. The overall design idea and overall installation and debugging operation process of this research project are introduced as follows.

1 Operating environment Firstly, considering the operating environment, there are the following unfavorable factors: First, the packaging site has large vibration, high corrosiveness and large dust; secondly, there are many power-using equipment such as packaging field motors, and the power grid fluctuates greatly, which is the power supply for the computer system. Stable operation will have a great impact; the third is that the sensor transmits the signal cable over the cable bridge, a large number of power control cables and other strong electromagnetic fields will also cause greater interference to the sensor data signal; Fourth, the large-scale on-site power equipment suddenly opened Stopping and sudden power loss can also pose a direct threat to the integrity of computer data. These issues must be considered when designing.

1.1 Sensing component selection () The primary component is non-contact to solve the impact of vibration shock.

Non-light source single probe type (if the light source double probe type is used, although the vibration shock is completely avoided, a large amount of alkali dust will make the light source probe not work properly) to solve the problem of a large amount of alkali dust.

The sensor probe is fully sealed (wide temperature belt) for all-weather moisture and corrosion resistance.

1.2 Host selection HK8500 professional industrial computer, the system uses high reliability dual power supply, including SYS power and I / O power. Both of these power supplies have the advantages of low-pass filtering of the grid, resistance to transient voltage surges, and resistance to high-frequency interference. In this way, the system itself is more suitable for industrial sites with large electromagnetic interference. The I/O power supply is used as the power supply for the measurement and control circuit of the I/O part of the terminal board on the terminal board. By taking this measure, the SYS and I/O parts are completely isolated, so that various field interference signals entering through the terminal board and Abnormal conditions do not affect the normal operation of the computer system.

1.3 Channel purification from the sensor to the host room is a large distance, there are more high-current power cables on the cable bridge and parallel, the electromagnetic interference between the lines is very strong. Therefore, the signal transmission line uses an outer shielded metal mesh type signal line, and the metal mesh layer is reliably connected to the earth. After the signal is sampled, RC filtering is performed to make the transmission system work in a relatively clean channel (for example).

1.4 Program Control Eliminate Noise Start with the software program and digitally low-pass filter the signal (counting pulse) from the sensor. Since the conveyor belt alkali packet signal belongs to the low frequency signal (S level), and the electromagnetic field interference spike wave is a high frequency signal, it is easy to enter the host system through the signal line. Therefore, especially for the system, low-pass digital filtering of the program software is added, that is, when the pulse signal enters the host, seven fixed-width sampling pulses are continuously issued by the program control, and when the seven samples are continuously valid, the program determines that the pulse width meets the requirements. , set (1) UNTER gate "on", so that all over-alkaline pulses larger than seven fixed-width sampling time can enter the host count. When less than seven times, the program negates the validity of the pulse width, and is also a very high frequency noise pulse. At this time, the program sets the COUNTER door off. This greatly reduces the environmental sound wave filtering of the electromagnetic interference at the packaging site (ie, the signal channel) Medium and high frequency spike interference signal elimination input signal sampling circuit 1.5 Online protection and stable operation To prevent computer data loss caused by sudden start and stop of large-scale electrical equipment on site and sudden power failure, the system adopts SANTAK*CIK1ONLINElkVAUPS online Uninterruptible power supply, that is, S-CIK1 and the mains system at the same time in the online transport and its connection system, if it fails, it will affect the host system connected to it. At this time, the online data of the industrial computer will be directly damaged. This problem, specially designed for the system from the software program, the data automatic protection program, that is, the data is specially saved online during the running of the program, after the power is restored, once the power grid is powered down, due to this When S*CIK1 is still in the state of grid connection, the host system is obtained at this moment.

2 After solving the problem of the system operating environment above the multi-screen operating system, it is necessary to establish a multi-screen operating system for the main design according to the actual needs of the production metering system.

In the first screen, there are four soda ash stations, corresponding to four belt conveying channels, each of which is equipped with an inductive sensor to measure the alkali bag. According to this, the main screen operating system is established: one is to draw a dynamic picture of the 1234 platform belt transmission channel on the screen, the dynamic measurement detection data is randomly displayed on each channel, and the second is not only according to the operation needs, but also on each belt channel. To take the big bag of alkali bag, you need to take the small bag of alkali bag, and also carry the heavy ash on the belt passage, the bag/pouch and the heavy gray/fine powder switch operation screen button, and the summary dynamic data multi-color display: make the operation intuitive and convenient.

The second picture (big bag) has two characteristics in the actual production operation of the packaging workshop: one is the piece production, and the other is the output analysis and real-time production inquiry for each time interval of each shift. In order to realize this function, a “query platform” was established for the system design, and four historical running curves were established for the 1234 platform channel. The time span control was implemented through the application program to achieve quick query (see). In this screen, the operator can directly drag the dynamic clock hands (ie, the start clock pointer and the end clock pointer) with the mouse to read the corresponding historical interval of 1234 from the same screen (for example, from 12:30:50~15) :18:20) Yield and real-time production.

Fine powder package. In order to solve this problem, a large distributed control system has been established for four channels (application of CS process control Liu Yuge (Tangshan Sanyou Group Alkali Industry Co., Tangshan 063305, Hebei Province). The distributed control system has been widely used in various production processes of our company. Such as calcining, 4 boiler, 3 steam turbine MXL system, carbonized CENTUM * CS system. Practice has proved that DCS system is effective for boiler safety and economic operation level. Since the 1990s, with personal computers (PC) The increasing popularity and compatibility of its software, openness, and increasingly standardized data communications, coupled with the cost of PCs far below the price of standard operating stations, has led to the introduction of PC-based operator stations. The CS*1000 of our company's 5 boilers uses a PC as an operating station.

The structure and characteristics of 1CS-1000 can be connected to the maximum of 24 operating stations and control stations, including 16 control stations and 8 operating stations. It adopts bus (coaxial cable) communication and has dual functions. The bus can be up to 1.6 kilometers long.

1.1 The operation station adopts ordinary PC, which requires 64M memory and 2G free space of the hard disk. The operating system adopts WINDOWSNT4.0, and the third screen (small bag) for Yokogawa is used. When the bag is switched to the small bag, the statistics of the small bag are automatically performed. For classification display. The operator can directly pull out the corresponding real-time output and the total output of the four stations on the historical trend line (1~4 channels) with the mouse.

The fourth picture, according to the requirements of the workshop, three shifts are to be carried out.

Each class must have a production report and report to the soda ash plant in time. In order to realize this function, a “production report platform” was established for the system design. On this platform, the operator can directly observe the soda ash fine powder and heavy ash output at each platform. And through the program control, the system automatically prints the production report of 14D5~0.05 at 0:05 in the night, prints the production report of 0:5~8:05 at 8:50 in the morning, and prints out 8:05~14 at 14:05 in the afternoon. : 05 production report. In addition to the automatic printing of the handover, the operator can perform on-line editing of the report and print the production report randomly as needed.

3 The working process of the system now takes a channel as an example to introduce the working process of the entire industrial control system (see).

When the alkali bag on the conveyor belt runs under the inductive sensor (QZ-2311), it first touches the baffle, which drives the sensor plate on the baffle to move upward to make the sensor plate approach the sensor. Due to electromagnetic induction, UQZ ―2311 sends a turn-on pulse signal (ie, it is determined to pass an alkali package) and then sends the signal to the I/O input filter board through the shielded signal cable, after partial pressure sampling and RC filter purification processing, and then enters PCL-83Q. /0 system, the digital signal processing of the input signal is controlled by the program to eliminate the noise wave. Finally, after the signal enters the industrial control host system and converts into digital information, it directly enters the multi-screen industrial control measurement operating system and completes the above four screens. The function runs.

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