Application of small electrical equipment in the transformation of municipal equipment

1 The principle of reform should be adhered to actively adopt new technologies and new theories, and effectively save energy and increase efficiency.

Keep the advantages of the original circuit, try to use electrical components with low technical content and low energy consumption.

The transformation steps should be simple and easy, that is, easy to install, easy to set, easy to maintain, and easy to operate.

To be fully considered, use as much money as possible to complete as much work as possible, and the materials used in each link must be small and refined.

2 Basic ideas and methods of transformation 2.1 Design of the transformation plan 2.1.1 Determine the technical level. Because it is improved and modified, the required technical level must be higher than the technical level of the existing equipment, so that the level of technology to be achieved after the transformation and the degree of equipment transformation can be considered according to the funds obtained. It is also possible to divide the device into several subsystems, and each subsystem is designed with a small scheme, each of which is both versatile and connected. Individual sub-line ships, so that you can concentrate on limited funds to raise the technical level of the subsystem to a higher level. When the funds are sufficient, further reform of other subsystems will be carried out, which will more effectively improve the level of the technical ship. For example, in the electrical transformation of the drainage pump station, the system is divided into several subsystems such as alarm system, control system, decontamination system and drainage system. According to the amount of funds, the control system and the decontamination system are firstly upgraded at a high level. When the funds are abundant, the other subsystems are modified, and the subsystems are combined through a simple connection.

2.1.2 Adopt reliability design. Reliability is the ability to perform a defined function under specified conditions and within a specified time. The specified conditions include the environmental and electrical conditions under which the equipment is operated. The environmental conditions are generally fixed, and the focus here is on electrical conditions. Mainly improve reliability from two aspects, one is to adopt redundant measures for design; the other is to improve system integration, photoelectric isolation, resistance and absorption absorption and other anti-interference measures in the design of control system. At the same time, anti-jamming measures are taken for instruments and their signal transmission cables that require high precision. For high-precision instrumentation, the whole box type shielding can be adopted; the signal line can be shielded by the shielding net; or the grounding can be rationally laid out to enhance the anti-interference.

When we upgraded the pumping station, we selected the SIMATICS7200 programmable controller produced by Siemens in accordance with this design idea, and enhanced the anti-drying capability by using the shielded mesh sheathing line and the box shielding instrument. Thereby improving the reliability of the subsystem operation.

2.1.3 Reasonable selection of design steps. 1 According to the actual situation, according to the order of device operation, write a feasible program. This is the most basic, determining the operating point of the device according to the way the transformation is intended to work with the equipment. And statistics, classification, according to the technical level to be achieved, select the control components. If the PLC programmable controller is selected, it is the basis for selecting the model and setting the operating program. 2 Try to improve on the basis of the original circuit.

Study the original circuit, retain the advantages, and develop a transformation plan. Among the multiple schemes, the most ideal scheme is preferred, or a feasible circuit is synthesized according to multiple schemes. 3 Find the source that implements automatic control. Investigate the entire system, study the various parts of the circuit, find the signal that can make the circuit operate accurately, and convert the indirect signal without direct signal.

After writing the feasible tricks, let the financial personnel think about it, each person took out 4 schemes for comprehensive optimization, selected the smallest and practical design scheme for the original circuit, and modified and transformed the electrical control signals. According to the operation of Qiangang, the working procedure of the equipment is: the water pump outlet valve can be opened after the pump is started; when the pump is stopped, the pump can be stopped after the pump outlet valve is closed. This requires four pumps to open, open, and valve, and pump. The pump on and off signals are obtained by the delay of the pump signal, and the pump stop signal is converted from the valve signal.

2.2 Correctly handle the problems encountered in the construction 2.2.1 Reasonably adjust the function of the components. In practice, some components have functions that exceed or are insufficient to be modified, and it is difficult to purchase qualified components in the market. In this case, the internal structure of existing components with similar functions can be slightly adjusted. Adapt to the functional requirements of the design.

2.2.2 During the construction, the preferred renovation design drawings or plans may be reasonably changed. In actual construction, it is often found that the design drawings are not compatible with the purchased electrical appliances. Due to the close task, the drawings can be appropriately changed, and the matching can be made without changing the original design function, so that the installation can proceed smoothly.

2.2.3 Test the reliability of the system. The purpose of the system reliability test is to achieve a predetermined reliability index for the modified equipment. Tests can be divided into laboratory tests and field tests. 1 Laboratory test: a After the scheme is selected, the reliability is identified, that is, the reliability is determined. Through multiple tests, the feasibility of the scheme is verified, and the parasitic circuit is eliminated, so that the circuit works stably and reliably. b Study the mechanism of system failure, and use it to repair various faults of equipment. 2 Field test: It is the reliability of the equipment operation reliability in the construction S, and the reliability level is verified. After the transformation, timely complete the test operation report according to the test record, further verify and analyze the reliability of the system, and re-improve the system to avoid functional disorder during the operation.

After reliable verification of the modified system, do a good job of marking the brand of each line, draw a complete transformation of the completed circuit diagram for nuclear and maintenance.

3 Summary This paper briefly introduces the general principles, ideas and methods for small-scale electrical automation. For more complex equipment, it can be based on the specific control system, control object and transformation requirements, and the research of block sharding. At the same time, it must be clear, the steps are reasonable, and the rules are clear, so that we can find reasonable improvement solutions with less effort. The purpose of the transformation.

(Continued from page 43) Aesthetic education.

Under the premise of realizing profound educational reform, implementing quality education, rationally adjusting the macro-structure of education, and ensuring the implementation of quality education from the construction and improvement of the system, the key is to change the prejudiced view of talents in the whole society and eliminate schools. The external pressures that bear the full play of the role of the three-in-one education network of schools, families and society. However, we will further change the concept of education, fully understand the essential attributes of quality education, establish a concept of teaching students who are responsible for lifelong life, and truly implement developmental education for all students in accordance with the party’s educational policy, quality education goals and social development requirements. The mission has been historically lost to our teachers. How to accomplish this arduous task is worthy of our education workers to seriously explore. Gorky said: "In terms of nature, people are artists. He always wants to bring beauty to his life wherever he is. Since beauty is a human nature, it is certainly more effective to implement education according to beauty. Aesthetic education can become the foundation of the whole education and the breakthrough of teaching reform. It can be seen that the key to the transition from exam-oriented education to quality education is aesthetic education. Only aesthetic education can fundamentally improve people's quality.

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