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Visiting Internship Report of Cable Manufacturing Factory

1. Internship Purpose and Internship Requirements

Purpose of Internship: Understand the general operation process of **** cable manufacturing factory , become familiar with the specific process of cable production, and learn the daily management work of the cable factory. Through internships, students can understand the general operations and management mechanisms of production enterprises, establish a perceptual understanding of the enterprise, and lay a foundation and preparation for entering social work in the future.

Internship requirements:

1. Follow the arrangements and guidance of teachers and company staff, be orderly, polite, and abide by the relevant regulations of the factory.

2. Listen carefully to the staff’s explanations, ask questions promptly and humbly if you have any questions, and put forward your opinions and suggestions politely.

3. Seriously study the relevant knowledge of the cable factory, including the cable production process, sales process, enterprise management work, etc., summarize your own gains and experiences, etc., and write an internship report.

2. Specific arrangements for the internship process

1. Understand in advance the general process of ** cable factory and general cable production and manufacturing by searching information online.

2. Arrive at the ** Cable Factory under the unified leadership of the teacher.

3. Listen to the company staff’s brief introduction to the cable factory, learn about its products, and the precautions during the visit.

4. Under the leadership of the staff, visit the cable manufacturing process on the spot, listen to the staff's introduction, and have a more vivid understanding of the specific process of cable production, production equipment, production requirements, precautions, etc.

5. Return to school collectively and write an internship report.

Text of the internship report:

The ultimate goal of learning is application. Only by connecting the theoretical knowledge learned with life practice and applying the learned theoretical knowledge to social practice can learning be achieved achieve the ultimate goal. The college has always paid attention to practice, advocated practice, and also strived to create opportunities and provide opportunities for students to participate in practice. Therefore, the college organized a regular visit to the company for us this time. Thanks to the "careful arrangements" made by the leaders and teachers of the college, we were able to understand the company and society early.

This time we visited the ** Cable Factory.

On the day of the internship visit, it happened to rain heavily, but this did not dampen the students' expectations at all. In order to combine theory with practice, to have a more concrete understanding of the production and management of the enterprise, and to have a deeper understanding of society, everyone completed this day's internship seriously.

We set off very early and arrived at our destination - ** Cable Factory early. The first thing I noticed upon arrival was the lush greenery of trees throughout the facility. Today, when the environment is increasingly valued, the greening of the factory undoubtedly left a deep impression on me. A good working environment is very important. At that time, I thought that creating a good working environment for the workers should also be an important aspect of the factory's management. This shows that the cable factory has an important people-oriented management concept.

After waiting for a while, an enthusiastic staff member in the factory gave us a vivid lesson. He briefly but vividly gave us an overview of the factory, telling us the main products of the cable factory, the main processes and precautions for cable production, the market and sales of the products, and some of the management of the factory. Work and management concepts etc. Then, he also reminded us of various aspects that we should pay attention to during the subsequent visit. I have really benefited a lot from this unique class, which is far away from school textbooks and integrated into social enterprises. This class first gave me a perceptual understanding of the production process of the production company, specifically the cable production process, which served as an important prerequisite for my subsequent visit. At the same time, this class also made me feel To the ** Cable Factory's rigorous style, innovative production guidance, people-oriented management philosophy and pursuit of high-quality service attitude.

However, "seeing is believing" and practice brings true knowledge. Therefore, an in-depth visit to the factory floor is the more important aspect and the main content of our internship. After one class, we all couldn't wait to visit the details of the production workshop. So then, we were divided into several groups, each group was led by a staff member of the company, and visited the factory workshop according to the product production steps to understand the cable manufacturing process.

Under the leadership of the staff, we finally came to the "real factory" - the workshop. The first thing that comes into view is a big red banner that says "Safety First." Indeed, no matter what the situation, safety is always the most important, especially in the production of large equipment and machines such as cables, safety issues cannot be ignored. "Safety comes from long-term vigilance, and accidents come from instant paralysis." I saw this civilized slogan in many places in the workshop. The staff told us that the factory always adheres to the people-oriented concept, attaches great importance to safety issues, and ensures that all production work is carried out in a safe environment. Today, when management is receiving more and more attention, people management skills are also receiving much attention. Enterprises' concern for the safety of workers has undoubtedly laid an important foundation for the enterprise's production and other aspects of management. Each workshop also has a "green channel" to ensure the safety of our visit; I also noticed that in each workshop, there are fire extinguishers at appropriate intervals.

The hygiene of the factory is also worth sighing about. No matter where I go, I can't see any waste paper, any garbage that shouldn't be there, or piles of debris. Although the factory looks a bit old due to its long history, its clean environment makes me feel brand new. Working in such an environment, I think everyone is willing to put in more effort, everyone will feel comfortable, and everyone will work hard.

During the visit, I also felt the company’s encouragement to workers, high requirements for quality, and goals of continuous product improvement. These can be seen from the civilized spirit slogans posted everywhere. out. "Improve our own competitiveness and establish awareness of customer requirements", "Quality is in my hands, customers are in my heart", "Continuous improvement is an eternal goal". It is not difficult to see that the cable factory has established a strong market concept, strives to improve market competitiveness with high-quality products, and continuously improves production processes to expand market share. The staff also told us that controlling quality is an important principle of enterprise production, continuous improvement and striving for innovation are important strategies for enterprise development, and winning the market is their ultimate goal.

During the visit, we learned that the 110kV cross-linked cable developed by **Cable in 1999 passed the new product and new technology appraisal (i.e. two-part appraisal) jointly organized by the State Machinery Industry Bureau and the State Electric Power Company. The appraisal of scientific and technological achievements was unanimously praised by experts; in the same year, 110kV cross-linked cable was included in the second batch of the National Economic and Trade Commission's "Main Equipment Products and Manufacturer Recommended Products Catalog for the Construction and Transformation of Urban and Rural Power Networks in China". In 2000, 110kV cross-linked cables were Lian Cable won the ** Provincial Excellent New Product Award. The 220kV cross-linked cable developed by the company passed the type tests conducted by the National Electrical Equipment Testing Center and the National Wire and Cable Testing Center respectively in May 2000. The main performance indicators of the product are higher than the requirements of national standards and IEC standards. And in November 2003, it successfully passed the one-year pre-qualification test at Wuhan High Voltage Testing Research Institute. The passing of the 220kV cross-linked cable pre-qualification test marks that the company's cable production technology level has reached a new level. This reminds me of a saying: Product quality is the life of an enterprise. The success of ** Cable Co., Ltd. is not only related to its sophisticated equipment and advanced technology, but also inseparable from its consistent quality management policy of "customer-centered, brand awareness, scientific management, innovation and improvement". **Cable not only introduces sophisticated equipment and possesses advanced technology, but also combines equipment and technology well, coupled with scientific management and innovative improvements, to produce high-quality products.

Throughout the visit, the staff patiently introduced us to each production step in detail with a positive attitude, and patiently answered the questions raised by the students.

From his work attitude, we can also get a glimpse of the work style of the entire enterprise, which is positive, rigorous and serious.

Although this internship seems to be just a simple visit, it plays a big role in a person's understanding. It broadens our horizons and gives us a more concrete understanding of things. Through the study of theoretical knowledge, what we understand is often only a vague concept, and it is difficult to have a clear understanding and specific understanding of the thing itself. Only practice can allow us to see the thing itself clearly. Through this internship, I experienced the production process of the enterprise and realized how to apply the theoretical knowledge learned in the textbook into practice. Looking at the big machines in the workshop and listening to the staff introducing their functions, I realized that there is still a big gap between theory and practice. It made me more aware of the importance of practice and focused on practice.

In the workshop, I saw the rigorous and meticulous work of the workers and their perseverance despite the hard work. I felt the basic qualities that a social person should possess. Through internships, we can better understand the difference between school and society, and be mentally prepared to enter society in the future. Through the hard work of the workers, we can see that the competition in society is fierce, and the pressure after entering the society may not be estimated when studying in school. Therefore, internship also allows us to establish the belief of continuous learning and hard study. Moreover, we should look for opportunities to participate in social practice, transform theory into practical actions in social universities, and become a person who is accepted and tolerated by society. Through practice, we can better cultivate our ability to endure hardships and stand hard work, understand how to be a better person, and improve our communication and work abilities.

Theory and practice are both wings of development. Theory cannot be separated from practice, and practice must rely on theoretical guidance. Internship is an important part of teaching and an important classroom for students to integrate theory with practice. The college organized this internship to allow us to treat theory and practice from a dialectical perspective. However, while harvesting, there are also some regrets, that is, I cannot truly understand the essence of corporate management experience, nor can I connect it well with our accounting major. I hope that in future internships, under the leadership and guidance of professionals, we can visit and study in-depth professional counterpart factories, and conduct education on professional scope, professional goals, and professional ideas in conjunction with reality, laying a foundation and creating conditions for us to learn professional knowledge. Go deep into the workshop to conduct internships in certain processes or positions, combine the theoretical knowledge learned with practical activities such as production, design, scientific research, etc., further deepen, consolidate and improve the theoretical knowledge learned, and gain the ability to engage in production and management of production. Knowledge and skills improve the ability to analyze and solve problems. Through visits and internships, we can further consolidate and deepen the theoretical knowledge learned, make up for the deficiencies in theoretical teaching, improve the quality of teaching, and lay a solid foundation for subsequent professional courses and graduation projects. Through production internships, we can also get in touch with society, improve social communication skills, learn from the excellent qualities and professionalism of master workers and engineering technicians, cultivate students' professional qualities, and clarify their social responsibilities. This internship provides us with an opportunity to understand factories, enterprises, and companies, and enhances our social practice capabilities.

If you only focus on theoretical knowledge and only know how to "talk on paper", you will never be able to go to the real "battlefield". Even if you do go to the battlefield, you will be vulnerable. In today's society, competition is becoming more and more fierce, and practical skills are receiving more and more attention. Therefore, on the basis of learning professional knowledge well, participating in more internships, linking the theoretical knowledge learned with practical activities, and improving the ability to analyze and solve practical problems, can we lay the foundation for ourselves to occupy a place in society in the future and prepare ourselves for the future. create conditions for further development. In short, this internship made me realize the importance of practice, further consolidated and deepened the theoretical knowledge I learned, and also allowed me to establish the goal of continuous learning, continuous practice, and continuous connection of theory and practice. I will master every step in the future. Once you have the opportunity to participate in an internship, you will also look for internship opportunities.

Other answers

According to the graduation internship arrangement in the second semester of the fourth grade, on the one hand, it is to review and consolidate the basic professional knowledge in the first three years, and on the other hand, it is to prepare for the subsequent graduation. The design paved the way for us to have a more comprehensive understanding of the automation major. Therefore, this internship is more meaningful than the previous understanding internship and production internship.

On March 15, 2007, under the leadership of two teachers, Yang Xiaohong and Zhang Changsheng, a dozen of us visited Kunming Cable Co., Ltd. (Kunming Cable Factory). This time we went to Kunming Cable Factory for an internship. We used a teaching method that combined lectures and on-site visits to the factory to overcome the difficulties of short internship time and low internship funds, and successfully completed this internship task. Through this internship, I have a relatively comprehensive understanding of the working objects, problems and solutions faced by the automation major in engineering practice. While consolidating professional knowledge, it also increases the sense of responsibility in the industry. During the internship days, friendships with classmates were also deepened and team spirit was exercised. The relevant professional understanding and personal reflections of the internship are now summarized in two parts as follows:

1. Introduction to Kunming Cable Factory

Kunming Cable Co., Ltd. (Kunming Cable Factory) is China’s largest cable factory A wire and cable manufacturer founded in 1936, it manufactured China's first conductor in 1939 and is known as the "cradle of China's wire and cable industry". The company is now a national large-scale enterprise. It is one of the 26 key backbone enterprises and the 10 largest and most economically profitable production enterprises in China's wire and cable industry. It is also the first batch in the industry to obtain the right to import and export self-operation and the designated production of industry king products. One of the enterprises, it is currently listed as one of the first batch of Taipei enterprises (groups) supported by Yunnan Province.

Figure 1: Main entrance of Kunming Cable Factory

Kunming Cable covers an area of ??450,000 square meters, has 21OO employees, has total assets of 388 million yuan, and has an annual output of more than 30,000 conductors tons, more than 10,000 kilometers of various types of power cables, and an output value of more than 450 million yuan. We can design and produce different types, varieties, specifications and models of wire and cable products in accordance with GB, IEC, BS and other advanced standards and user requirements. With the advantages of various product varieties, strong supporting capabilities and the production of large-length and large-section cables, Kunming Cable was the first company in Yunnan to pass the IS09001 international quality system certification in 1995, and successfully passed the IS09001 review and renewal in 1998.

The "Kun Dian Gong" brand products produced by Kunlan are not only used in special fields such as aerospace and aviation, but are also widely used in key domestic projects. In recent years, we have been committed to the research and development of high-temperature resistant, fire-resistant, oil-resistant, flame-retardant, water-resistant, low-smoke, low-halogen, termite-proof and other wire and cable products based on international general standards and foreign advanced standards, and have continuously launched new results and products. .

Eighteen varieties of "Kun Dian Gong" wire and cable products have won the title of provincial and ministerial excellence. In 1994, they were recommended as "domestic quality products" by the China Quality Inspection Association, and in 1995 they were recommended as "domestic products" by the China Consumer Foundation. "Consumer Trustworthy Product" was identified as one of the first batch of famous brand products in Yunnan Province in 1997.

2. Main products of Kunming Cable Factory

1. Aluminum stranded wire and steel core stranded wire

2. Cross-linked polyethylene insulated power cable

3. PVC insulated power cable

4. Insulated overhead cable

5. Nylon sheathed wire and cable

6. Mining cable

7. Flame-retardant cables for coal mines

8.450/750 and below rubber insulated wires and cables

9.450/750V and below PVC insulated wires and cables

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10. Prefabricated branch cables

11. Municipal communication cables

12. Polytetrachlorethylene insulated wires for aviation

13. Aviation Use chlorine plastic-46 insulated wires

14. Wrap small-section installation wires with tetrachlorine film

15. Chlorine-46 insulated flexible wires

16. Many Core chlorine-46 insulated chlorine plastic sheathed cable

17. Plastic insulated control cable

18. Electric submersible pump cable

19. Heat-resistant silicone rubber insulation Electric Lantern

20. Drag-resistant mobile cables for outdoor use

21. Motor winding lead wires at 150 degrees and below

3. Kunming Cable Factory Bare Wire Branch Production process flow

The focus of our internship is the production process flow of Kunming Cable Factory. Engineers from the bare wire branch of Kunming Cable Factory first explained to us in detail the theoretical knowledge of the bare wire production process, and then took us to visit the production workshop.

In the picture below, the PLC is connected to an external voltage of 0-10V (analog input). The input analog signal is converted into a digital signal inside the PLC. After being processed by the PLC, it is compared with the standard setting data. , the PLC outputs analog control signals, and then adjusts the speed of each DC motor. The DC speed regulator connected to the DC motor that controls the wire drawing machine feeds back analog signals to the PLC. Specifically, one PLC controls three DC speed regulators, and three DC speed regulators control three DC motors. The DC speed regulators are equivalent In the transmitter, the DC speed regulator feeds back the voltage signal to the PLC. The PLC used in this production line is S7-200 from Omron and Siemens.

The DC speed regulator changes the armature voltage by changing the excitation, thereby controlling the speed of the motor. The wire drawing machine controlled by the DC speed regulator draws the 9mm copper rod into 4-1.17mm copper wire for users to use.

DC motor parameters: Power: 250KW

Excitation voltage: 180V

Rated voltage: 440V

Armature current: 600A

Rated speed: 1500r/min

The traction machine uses a rotary encoder to measure the speed, and its control parameters:

Power: 75KW

Excitation voltage : 180V

Rated voltage: 440V

The take-up machine uses a frequency converter to adjust the speed of the squirrel cage machine.

In the picture below, the one on the left is Omron's PLC. The first module from the left is the power supply, the second is the CPU, and the rest are I/O modules.

The core control of Kunming Cable Factory is tension control, and tension control is to strictly control the speed of the motor so that it can neither be too fast nor too slow. When controlling the speed of the motor, it uses Continental 590 DC controller.

IV. Continental 590 DC speed regulator

Figure 2: Continental 590 DC speed regulator used in Kunming Cable Factory

The DC speed regulator is to regulate the DC motor. The upper end of the speed device is connected to the AC power supply, and the lower end is connected to the DC motor. The DC speed regulator converts the AC power into two output DC power supplies, one input to the DC motor magnet (stator), and the other input to the DC motor armature (rotor). , the DC speed regulator regulates the speed of the DC motor by controlling the armature DC voltage.

At the same time, the DC motor gives a feedback current to the speed regulator. The speed regulator determines the speed of the DC motor based on the feedback current and corrects the armature voltage output if necessary to adjust the speed of the motor again. All control algorithms in the 590 series are completed by the latest high-speed 16-bit microprocessor (single-chip microcomputer). The structure of the control software and the working speed of the microprocessor can ensure that the adjustment of all control loops operates on the six thyristor bridges of the main circuit. It is completed within the conversion time to ensure that the sampling time of the current loop is less than 3.3ms (50Hz power supply) or 2.67ms (60HZ power supply). The speed loop algorithm operation can also be completed within this time to obtain superior dynamic performance.

This DC speed regulator can be used for precision speed control and tension control, and is widely used in machine tools, cables, cement, plastics, papermaking, steel metallurgy, metal sheet processing and other industries. It is cost-effective Quality product.

The Continental 590 DC controller is a fully digital control, and the DC control is stable and reliable.

Has the following functions:

Advanced PI regulation

Excitation regulator

Communication capability

Regenerative and non-regenerative mode

Diagnostic function: digital display of the working status of the whole machine, latching of the first fault

Built-in function modules: diameter module, taper module, torque module, speed modules and other powerful functional modules.

Figure 3: Engineers introduce us to the Continental 590 DC controller

In addition to the Continental 590 DC controller, the core components used by Kunming Cable Factory are mainly German PLC programmers. SIMATIC S7-200 produced by SIEMENS.

5. SIMATIC S7-200

Germany's Siemens is the largest electronic and electrical equipment manufacturer in Europe, and its SIMATIC programmable controller is the leader in Europe. status. Its first generation of programmable controller is the SIMATIC S3 series control system launched on the market in 1975.

In 1979, microprocessor technology was applied to programmable controllers, resulting in the SIMATIC S5 series, which replaced the S3 series, and then the S7 series was launched at the end of the 20th century.

The latest SIMATIC products are SIMATIC S7, M7 and C7 series.

The SIMATIC S7-200 system consists of two major parts: hardware and industrial software, as shown in the figure below:

The appearance of the SIMATIC S7-200 system CPU 22X series PLC host (CPU module) As shown in the figure below:

SIMATIC S7-200 series PLC is suitable for automation of detection, monitoring and control in all walks of life and in various occasions. The powerful functions of the S7-200 series enable it to realize complex control functions whether running independently or connected into a network.

The S7-200 series PLC can provide 8 types of CPUs in 4 different basic models for you to use.

u CPU 221 has 6 input points and 4 output points

u CPU 222 has 8 input points and 6 output points

u CPU 224 Has 14 input points and 10 output points

u CPU 226 has 24 input points and 16 output points

CPU 221/222 has 4 high-speed counters (30KHz), It is programmable and has a reset input. The two independent input terminals can count up and down at the same time, and can be connected to two A/B phase incremental encoders with a phase difference of 90°.

CPU224/226 has 6 high-speed counters (30KHz) and has the same functions as CPU221/222.

The S7-200 CPU provides a pulse capture function for each host digital input, which enables the host to capture short pulses less than one scan cycle and hold them until the host reads this signal, but The premise is that pulse capture is effective only after passing through the filter. In addition, if there is more than one pulse in a given scan cycle, only the first pulse can be captured. The pulse capture waveforms in several cases are as shown below:

SIMATIC S7- 200 provides the following easy-to-use functions for all stages of automation engineering projects: hardware and communication planning, configuration and parameter assignment; user programming; documentation; system testing, startup, service; process control; archiving. Its characteristics are: Adopt multiple standards to share data management tools System integration and open system Reusable program segments Integrated diagnostic functions

Figure 4: SIMATIC S7-200 used by Kunming Cable Factory

Figure 5: The engineer is introducing us to the structure of the equipment in detail

6. Structural diagram of the control loop and main loop of the bare wire branch of Kunming Cable Factory

Figure 6: Kunming Cable Factory Series Machine (Continuous Pulling and Extrusion)

Using Continental and SIEMENS company’s advanced control technology to produce all-digital DC transmission devices with various power capacities, all-digital AC frequency conversion devices, all Digital AC cascade speed regulating device, the above products can realize fully automated and intelligent control engineering through PC, PLC, DCS and other control solutions and fieldbus connection. Products and projects are widely used in metallurgical steel rolling, building materials and cement, power generation and distribution, intelligent buildings, scientific research institutions, paper making and glass, ventilation and water supply, environmental management and many other fields.

7. Conclusion

Through this internship, I truly realized the importance of combining theory with practice.

I am studying automation. I have learned many classic theories in books. They seem easy to understand, but I have never put them into practice. Maybe I will not realize them until I actually go to the production line of a company. How difficult is it? We have seen many wonderful automation technologies from teachers or in books, which seem to be easy. Perhaps we can only realize our lack of ability and lack of knowledge when we see it in person or go to battle in person. During the internship, I broadened my horizons, increased my knowledge, and experienced the cruelty of social competition. More importantly, I hope that I can accumulate all aspects of experience at work to prepare myself for the future. The graduation internship is over, and next is the intense graduation project. I believe that this on-site internship experience will play a huge role in our graduation project and our future work and study