Summary report on practice of measurement and control technology and instrument

Summary report on practice of measurement and control technology and instrument

After studying in university for three years, however, most people still have a little knowledge of this major and are obsessed with measurement and control technology and instruments. At the end of the sophomore year, the college organized a week's internship for us, but because the knowledge learned at that time involved little knowledge of this major, it was difficult to connect what we saw with this major, and many students were always at a loss about this major.

This summer vacation, the college originally organized us to go to Shanghai for internship, but due to the sudden atypical epidemic, we had to re-determine the overall plan. After the college's efforts, we finally chose Shunde as our practice base. What are measurement and control technologies and instruments? What is this major suitable for? What is the future of this major? With these questions, we participated in the production practice. This production practice is led by three teachers, Cha, Li Mian. Four classes of measurement and control specialty, 150 people participated in the practice. On June 30th, I set out for Shunde, and settled in Shunde Daliang Fengcheng Middle School.

It's really exciting to come to a strange place for the first time in three years. The middle school where we live has a good environment. Because it is a middle school and summer vacation, it is very quiet here. This is really a good place to study. I just want to make my own network engineer plan after my internship, so that I can make time. The internship was originally scheduled for three weeks, but due to some unexpected things, the trip was eventually shortened to two weeks, and the production internship was planned for four weeks, so the remaining two weeks must be made up next semester! During the two-week production practice, we went to large factories such as Shenling Air Conditioning Equipment Co., Ltd., Shunte Electric Appliance Co., Ltd., Midea Dishwasher Company, Liansu Technology Industry Co., Ltd., Guangdong Lihong Machine Co., Ltd., Shunde Kewei Electronics Co., Ltd., Guangdong Forging Machine Tool Factory, etc., to understand the production situation of these factories, all kinds of knowledge related to this major, and the work situation of workers in each factory.

For the first time, I personally felt the application of knowledge and practice, the application of sensors in air conditioning equipment, the application of electronic technology in electronic industry, the application of precision machinery manufacturing in machine manufacturing and so on. The combination of theory and practice has opened our eyes. It is also a preliminary test of what you have learned before! This production practice really benefited us in our future study and job search. In just two weeks, let's return to the perceptual re-understanding, let us have a preliminary understanding of society, and it is also enlightening for the direction we should grasp in the future! Shunde is a beautiful place, and the traffic routes here extend in all directions. Perhaps this is why Shunde has always been the first of the top 100 counties in China! Of course, there are also reasons why its system is sound and social security is perfect! This is also the beginning of our initial involvement in society, and we are moving towards a beautiful and cruel future. I have always believed in my ability. Even if the road of life is like a highway extending in all directions in Shunde, there is only one direction, that is, go ahead and never give up, never back down!

Shenling air-condition equipment co., ltd

On July 1, the first day of our internship, we came to Shen Ling, a central air-conditioning manufacturer. When he arrived at the factory, the person in charge of the factory first introduced some production situations in Shen Ling. It is reported that Guangdong Shenling Air Conditioning Equipment Co., Ltd. was officially completed and put into operation in 1992. Is a modern enterprise integrating scientific research, production, testing, sales and engineering services, and is one of the 500 largest motor and equipment manufacturers in China. Specializing in the production of "Shen Ling" brand large and medium-sized water-cooled air-cooled unit air conditioners, clean air conditioners, special air conditioners for constant temperature and humidity machine rooms, roof air conditioners, special air conditioners for high temperature environments, dehumidifiers and water chillers, which are composed of fan coils, cabinet fan coils and combined air processors. Among them, unit air conditioning and clean air conditioning include cold air type, cold air electric heating type, heat pump type, constant temperature and humidity type and many other series and varieties. Then we divided into five groups to visit its production workshop.

We first came to the sheet metal workshop. From the layout management diagram of the workshop, we can know that the production process of the workshop is: blanking area->; Stamping area->; Solder library->; The second solder library->; Stamping transition zone->; Special inspection points for spare parts-> Aluminum alloy processing zone->; Semi-finished sheet metal turnover area->; Welding->; Spraying->; Finished product. In the sheet metal workshop, I watched the production of various machines. There are M-2023 shearing machine, J23-25 punching machine, J23-40 punching machine, J23-60 punching machine, J23-80 punching machine, J28-500 four-column hydraulic press, CSW-250 angle steel punching machine, TA-60T bending machine, RG-80 bending machine, and so on, all kinds of familiar and unfamiliar machines. Then there is the double equipment workshop. In the two-machine workshop, we watched the production process of drilling machines and fin presses for pressure vessels, as well as the production of some machines whose names have been forgotten. In the assembly workshop, the person in charge of the factory explained the principle of shell-and-tube heat exchanger and water-cooled condenser to us. In this workshop, we have been able to see a complete prototype of central air conditioning. In this behemoth, we have applied all kinds of knowledge we have learned, including sensors, electronic technology, precision machine manufacturing and so on.

As can be seen from the workshop of Shen Ling Company, the air conditioning technology in China is basically mature, depending on whether its central processing chip is imported! In the factory inspection workshop, the master explained the process of product inspection to us and showed me how the inspection was carried out. The instruments used include precision instruments and common tools. There is an instrument that we have never seen before, that is, an ammeter using sensor technology. At the test center. In the communication with the master, we learned about the product testing process and related work. After a day's visit, I got a preliminary impression of the factory after studying. Although the factory uses many advanced machines, to be honest, the degree of automation here is really flattering, and the working conditions of workers are really average! My classmates told me not to expect too much. They do central air conditioning. It is really not easy to complete automatic production for such a big project. It is possible! But as a member of China industry, I think it is necessary for them to find another better production method! Shunte Electric stopped at Shunte Electric on July 2, which is a special transformer factory with an annual output value of 10.

300 million large enterprises and factories have also established a technology development center (Guangdong Transformer Technology Development Center), which provides strong technical support for the production of our factory. This factory mainly produces dry-type transformers. As the "No.1 brand in transformer industry in China" (evaluated by China Survey and Statistics Office) and a high-tech enterprise awarded by the State Science and Technology Commission to implement the torch plan, dry-type transformers have been ranked first in China with the market share of 1992, accounting for more than 35%. At present, six generations of products such as SC-SC3-SCB3-SC8 (SCB8)-SC9 (SCB9)-SCL 0 (SCB10) have been developed for dry-type transformers, among which the technical parameters of SC 10 series products have reached the international advanced level. Epoxy resin cast dry-type transformer is the first dry-type transformer in Shunte and the first one in China. Product features of dry-type transformer: 1, safe, flame retardant, pollution-free, and can be directly installed in the load center. 2. Maintenance-free, easy to install and low comprehensive operation cost. 3. It has good moisture-proof performance, can run normally at 100% humidity, and can be put into operation without pre-drying after shutdown.

4. Low loss, low partial discharge, low noise, strong heat dissipation ability, and can operate at 150% rated load under forced air cooling. 5. Equipped with perfect temperature protection control system to provide reliable guarantee for the safe operation of transformer. 6. High reliability. According to the operation research of more than 20 thousand products that have been put into operation, the reliability index of the products has reached the international advanced level. Dry-type transformer technology has embarked on the road of independent innovation and reached the international advanced level. At the same time, the factory has also developed many other types of urban network electrical products, such as reactors, American box transformers, combined substations, SF6 transformers, complete sets of equipment and switch cabinets. After visiting the exhibition hall, we went to visit the production workshop. Everyone knows two parts of transformer: ① iron core ② coil. In the iron core workshop and the coil workshop, we saw the production process of these two parts respectively. This is the first time I've seen such a big transformer device. It's really jaw-dropping! Leading us around is a senior engineer. While leading us around, he explained the relevant knowledge of transformers to us. In the coil workshop, he asked us what we should do to ensure that the accessories don't rust. Everyone has their own opinions, but they are not complete. He went on to say that there are two kinds: ① hot spraying gold and ② hot stamping. Then I went to the assembly workshop.

I think what impressed me the most today is Shunte's automatic warehouse and a complete set of CNC machine tools in the bronzing workshop. Although it's a pity that we can't see the operation of the automated warehouse now, it's really rare to see this kind of automated warehouse for the first time. And that CNC machine tool imported from Japan, its automation, its precision and its performance index are really amazing! When can we produce this machine in China? The visit time in Shunte is very short, but the new attractions every day enrich our brains, and the understanding and contact with different knowledge in different fields broaden our horizons. Midea Dishwasher Manufacturing Co., Ltd. On July 3, we came to Shunde Midea Dishwasher Manufacturing Co., Ltd., which is located in Beijiao Town Industrial Park, Shunde.

It is one of the top ten investment projects in Shunde 65438-0999. Jointly operated by Guangdong Midea Group Co., Ltd., Italy Punoteco Co., Ltd. and Hong Kong Star Co., Ltd., Midea Dishwasher Manufacturing Co., Ltd. has invested heavily in introducing advanced product technology and key testing equipment, manufacturing equipment and molds from meloni, Italy, to produce and operate dishwashers and their accessories. Its production automation is among the best in the international industry and second to none in China. At present, it can produce more than 500 thousand dishwashers every year. After the second phase of investment is completed, the annual production capacity of 1 10,000 dishwashers will be formed. Midea Dishwasher Manufacturing Co., Ltd. adheres to the guiding ideology of "export market support is the mainstay, domestic sales is the supplement" and takes export as the guide to realize the internationalization of products. At present, nearly 30 products in three series have passed various certifications such as as GS, CE, EMC, UL of the United States, CSA of Canada, etc., and obtained an effective "passport" for products to enter the European and American markets smoothly. In addition, the performance index of 18 inch cabinet dishwasher developed and produced by Midea Dishwasher Company has reached AAB standard.

Up to now, Midea Dishwashers have been successfully sold to 15 countries and regions, and they are popular with good quality. Midea Dishwasher Manufacturing Co., Ltd. mainly produces desktop dishwashers and cabinet dishwashers. The main parameters of desktop dishwasher are: the highest water temperature of mechanical program controller is 85℃, and the highest water spraying speed is 7. 8 m/s waste heat drying transparent window for 3-5 people. The main parameters of cabinet dishwasher are: water softener, magnetizer, mechanical program controller, three-layer spray washing, maximum water temperature of 75℃ and maximum spray speed of 7. 2 m/s waste heat drying stainless steel bowl rack automatically discharges slag, which can be used by 5-8 people. According to the person in charge, because the raw materials were not replenished in time, the main production line just stopped production, so all we can see is the production of some production parts. In the production workshop, the most striking thing is a set of fully automatic control inner liner production line.

From grabbing raw materials-cracking-wrinkling-scratching-finished products, the whole production process is completed automatically by robots and machines. At the control point of the hydraulic press, you can see that it consists of two parts. One is single-acting sheet stretching hydraulic press, and the other is closed double-point mechanical press. Then the person in charge showed us around the production line that had just stopped production and explained the production process of the production line. He spoke vividly, making people feel immersive. If we can see the production process at a glance, it will be a magnificent sight. Then we went to the sample unit and the process test area. The head of the team explained to us in detail the working situation, control, operation, internal composition and so on of a dishwasher designed by ourselves.

In the process test area, we can see the process of their inspection of finished products, which is very important for them to improve their products and improve their performance. Dishwashers are still a very new thing for us in China. Midea's ability to seize business opportunities shows how avant-garde its vision is, but it is just beginning. Most of their products are exported by helping others, and the central technology is also imported. According to the person in charge, if you export in the name of beauty, the benefits may not be very good. What a sigh! But the purpose of our coming here is to learn, and these things have little to do with us. Our task is to apply what we have learned to practice in the near future and see if we can make a difference! Liansu Technology Industry Co., Ltd. On July 4th, we came to Guangdong Liansu Technology Group, which is one of the largest manufacturers of plastic pipes and plastic extrusion equipment in China. As a group and modern high-tech enterprise, Liansu mainly engages in plastics, machinery and electrical appliances, and also covers chemical industry, trade, international investment and other fields. Its leading products are plastic pipes and plastic extrusion production equipment. Plastics mainly produce PVC-U water supply pipes, drainage pipes, PP-R drinking water pipes, PE pipes, aluminum-plastic composite pipes, PVC trunking pipes and other products; Machinery mainly produces PP-R pipe extrusion production line, PVC pipe extrusion production line, aluminum-plastic composite board production line, pe double-wall winding pipe extrusion production line, large-diameter PVC pipe production line, parallel twin-screw extruder, PVC plastic-steel door and window production line and other mechanical equipment; Electrical appliances mainly produce advanced switch sockets and ventilator series products; In the chemical industry, we mainly research and develop new products such as chemically modified materials.

The above information was learned from the advertisement made by this factory. The person in charge of the factory specially arranged for several brothers of South China University of Technology and Guanggong to show us around, and one of them led us. While showing us around, the senior brother of South China University of Technology also explained the characteristics, performance, specifications and other related knowledge of the products for our understanding. According to records, the characteristics of PVC-U drainage pipe products are: it is suitable for large buildings with current specifications, and the inner wall is smooth, reducing the friction resistance of fluid. Pipes and fittings with high impact resistance and corrosion resistance are fully equipped and connected by soluble adhesive. Light weight, convenient transportation, installation, maintenance and repair, long service life. PVC includes pipes (LSP series), rainwater pipes (LSY series) and flared pipes (LSK series). Product features of PP-R environmental protection healthy drinking water pipe: sanitation, no chemical action, convenient and reliable installation for oxidation problems, heat preservation and energy saving, light weight, high specific strength, smooth inner and outer walls, low running water, low noise and high heat resistance; Low thermal conductivity, can withstand hot water and high-pressure products, high flexibility, not afraid of cold and high temperature, can accept large expansion, corrosion resistance, long service life and no scaling. Specification of recyclable products: the specification of Liansu PP-R pipes and fittings is Ф 20-Ф10mm. In addition, Master Hua Gong also gave us a detailed explanation on other products such as PVC-U double-wall corrugated pipe, pe healthy water supply pipeline and PE safe gas pipeline, and enthusiastically answered our questions. Finally, the person in charge of the factory personally led us to the socket production workshop.

Guangdong Li Hong Machinery Co., Ltd. On July 7th, the first day of the second week of internship in Shunde, we came to Guangdong Li Hong Machinery Co., Ltd. Guangdong Li Hong Machinery Co., Ltd. (formerly Shunde Qinchuan Hengli Plastic Machine Co., Ltd.) is a high-tech enterprise in Guangdong Province, a postdoctoral experimental base for plastic machinery major of South China University of Technology, and the largest professional factory for producing fully hydraulic injection molding machines in China. It is also the only manufacturer in the world that can mass-produce 100 tons to 6,000 tons full-hydraulic small and medium-sized injection molding machines. It is the leading product that has been patented by China, Japan, Europe, the United States and other countries. It is the first national torch plan project among peers. Its series of products have been listed in the national key new product projects for many times, and authoritative experts in the domestic molding machine industry have consistently rated the mold-locking structure and hydraulic system as the first in the world, and the technical performance of the whole machine has reached the advanced level in the world. Its successful listing is a major breakthrough in the field of fully hydraulic injection molding machine. Through continuous innovation and development, Li Hong Machinery Company has successfully introduced various special injection molding machines-PET special injection molding machine, U-PVC special injection molding machine, thermosetting plastic injection molding machine, nitrogen thin-wall rapid injection molding machine, two-color two-component injection molding machine, ultra-precision DVD disc complete production equipment and high-speed, high-precision small injection molding machine (with a clamping force of less than 30 tons) dedicated to the production of micro-electrical appliances and electronic connectors. This series of products are favored by users because of their outstanding advantages such as precision, no wear, long service life, high speed, high efficiency, energy saving and no need for mold adjustment.

Its leading product, fully hydraulic four-cylinder direct-locking two-plate injection molding machine, technical requirements: Model C is equipped with 25kg dryer as standard, and the delivery performance and application scope of 68# hydraulic oil auxiliary machine: ● The four pull rods are balanced, the force line is shortened by 40%, and the system is rigid; ● High repeatability of clamping force; ● Control the clamping force according to the injection pressure feedback; ● Die setting can be automatically adapted; ● High-precision products such as gears, lenses and optical discs can be molded. Technical requirements of moving template injection molding machine: standard configuration of E-type machine (equipped with Italian oil motor), 20-opening nitrogen accumulator (nitrogen injection device), PID hydraulic control (solid state relay), minimum mold thickness 120mm (40mm thick steel plate on the head plate), 50kg machine cutting dryer, and Li Hong "G" series precision molding machine. On the basis of the original "E" machine, it is further upgraded, equipped with a high-response closed-loop servo system and a rapid nitrogen injection device, which is applied to Austrian B&R computers, and is specially used for the molding of precise parts such as optical disks, optical lenses, clock gears, electronic connectors, mobile phone housings, etc. Standard configuration: Austrian computer (special device can be remotely controlled by computer, which is more suitable for export) ● Servo system is used for injection molding ● Double pumps, nitrogen rapid injection device ● Hard chromium-plated screw ● Injection molding, mold locking and ejection positions are all controlled by electronic ruler ● PID temperature control ● Triple safety protection devices for machinery, electricity and liquid ● After visiting its production workshop, General Manager Huang returned two sets of hydraulic core-pulling devices. He said that two factors contributed to the success of China factory. Perhaps this is also the reason why Li Hong has changed from an abandoned factory to a high-tech enterprise with the scale of development now! There is also his sentence: money is not the first thing in life, life should have goals, ideals and serve the motherland. I have been entangled in my heart and I can't forget it for a long time! According to him, he recently obtained two patents. Although he is the boss, he has never forgotten his scientific research work, which shows how open-minded and noble his sentiment is! Shunde Kewei Electronics Co., Ltd. came to Kewei Electronics on July 8. We just arrived at the factory, and the person in charge first introduced the production situation of the factory. It is understood that the output value of this factory is 1 100 million, which is a small and medium-sized enterprise. The company's products are mainly composed of air conditioning series controllers, refrigerator computer chip controllers, microwave oven controllers and water heater controllers, including frequency conversion control and fuzzy control technology. The company has a group of high-quality electronic software and hardware development technicians, advanced production, testing facilities and manufacturing technology, with an annual output of 3 million sets of various microcomputer controllers. Over the past seven years, the company has developed, designed and produced more than 300 kinds of microcomputer controllers, and established long-term supporting supply cooperation relations with internationally renowned home appliance groups such as Kelon, Midea, Valin, TCL, Galanz, Wan Jiale and Aucma. As a manufacturing industry, the company invests 5% of its sales revenue in technology development every year, and constantly introduces new technologies such as single chip microcomputer, control and display into home appliances to improve the technical content of the home appliance industry. The integrated design of new technology and manufacturing technology makes the products more competitive. The powerful software development center has a complete set of development tools from Motorola, NEC, Mitsubishi, Toshiba and other well-known single chip manufacturers, providing programming, online simulation, intelligent software testing and other services.

As a manufacturing enterprise, it has the following characteristics:

Well-made products not only rely on scientific management, but also need advanced technology and facilities to ensure.

L SMT surface mount and hot air reflow soldering make the controller precise and reliable, and the product design space of the whole machine is larger.

The automatic plug-in process represents the cutting-edge technology of peers, which is more standardized and flexible for products and realizes high efficiency and high quality.

L The specially designed aging experiment production line with load has solved the problem of early failure of components, made the ex-factory products more reliable, and ensured that the repair rate is less than one thousandth after three years.

L 100% computer online testing can eliminate a small number of component problems, reduce the rework rate of subsequent processes and improve production efficiency.

L closed dust-free workshop to ensure a clean environment during product manufacturing.

In its workshop, we can also see that the production of this factory is quite clean and environmentally friendly. Visited the workshops of molding group production, plug-in group, wave soldering, paint dipping room, testing and installation. What attracts me most is the fully automatic double wave soldering tin device in the wave soldering workshop. The quality control point is the on-line tester and the controller universal tester. In the afternoon, under the arrangement of the person in charge of the factory, we had the honor to participate in the production in person. Although the work we do has nothing to do with our major, we can do it ourselves and feel the joy of labor. This is an experience! I and five other people were arranged in the inspection and installation workshop, and the job was to fix the transformer on a circuit board with a binding wire (only part of the production line). This job seems easy, but it's not that simple. At the beginning, the worker's sister behind the production line always turned on the red light, and the tie was either loose or substandard! However, after many times' teaching by the master and my patient study, I finally found a good method of tying knots, which is more convenient and labor-saving than the method taught by the master, thanks to my physical knowledge! The knowledge I have used is very simple, that is, the nature of applying friction. People who don't know this knowledge will never think of it! An afternoon passed quickly. This is a special day. Although I am a little tired than other times, I am very happy! Guangdong Forging Machine Tool Factory on July 9th, we came to Guangdong Forging Machine Tool Factory, which is the first enterprise in domestic forging industry to pass ISO 900 1-2000 and mechanical safety certification, a high-tech enterprise in Guangdong Province and a national export base enterprise. At present, we have advanced processing equipment, such as gear grinder, crankshaft grinder, guideway grinder, CNC boring and milling machine, CNC lathe and CNC machining center, and have strong technical compatibility and first-class management system. We mainly produce YD28, Y28, Y34 and Y30 series hydraulic presses, J76, STP, STPL, JH2 1, JH25 and JH36544. The main products of this factory are presses, including J2 1 series and JH2 1 series. The old J2 1 series has been gradually replaced by the new JH2 1 series because of its potential safety hazards. We were accepted by the seniors of Guangdong Institute of Machinery in 1992. After explaining the development, production scale and production safety of the forging plant, they showed us around the measuring room in batches. In the measuring room, we can see many precision instruments that we have never seen before, such as level meter, spring tester (with built-in pressure sensor), dual-purpose calibrator for pressure gauge and oxygen meter, micrometer (with outer diameter and inner diameter), verticality tester (with optical sensor), projection meter length measuring machine (with photoelectric sensor) and so on. Senior brother also explained to us the use, calibration and maintenance of these instruments. After visiting the measuring room, we went on to visit the sanitary workshop. Because this is a heavy machinery factory, we pay great attention to safety. Before entering the production workshop, each of us was given a safety helmet.

In the workshop, we watched the production process of Y34- 100 moving frame hydraulic press, Wuhan Heavy Machine Tool Plant and Gaoming Precision Machine. The senior brother also explained to us the characteristics, performance and application of the machines produced in the workshop. JH2 1 series open fixed bench press JH series high-performance press, the body is welded with steel plate, and after polishing, it is artificially aged and passivated and anti-embroidered, with small deformation and good rigidity. Pneumatic wet friction disc clutch combined with braking device has long service life and low noise. The gear pair and sliding pair are quenched by heat treatment and precision ground, and the transmission is stable. Using PLC control, it can realize emergency stop, inching, single and continuous blanking. It can flexibly adopt fixed speed or variable speed, and cooperate with automatic feeding device to form a single or multi-machine automatic stamping production line. Y28 and YA28 series four-column double-action hydraulic press: Y28 four-column double-action hydraulic press is mainly used for drawing, forming and straightening of sheet metal. The main hydraulic and electrical components of this machine are international famous brand products, which can be equipped with photoelectric protection devices.

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