Application of Frequency Control and PLC Control in Air Compressor Retrofit

1 The operation of the original air compressor Pingshuo Coal and Electricity Company Baimiao Mine is now using 220 double-cylinder water-cooled piston air compressor, gas production capacity 201 drag motor power 132 Dimensional rated speed 7301 heart rated Ding work electric 380 rated work Current 261 current 62 power factor 0.81 rated pressure 0.8 makes the working pressure 0.550.65, when the air compressor reaches the rated working pressure 81 inches. The air compressor automatically closes the intake valve, so that the motor drives the air compressor to perform no-load operation. The daily load running time and the no-load running time ratio are 1014. The control cabinet is the starting cabinet, and the protection function is small, and the air and heavy load are continuously operated.

2 The original system has a low operating power factor. The power factor is 81 motor starting current is large, the starting current is 94, 4 air compressor noise is large, vibration and motor heating is serious. The presses are repeatedly loaded with heavy loads. Accelerate the wear and tear of air compressors, increase the cost of electricity, increase the workload of maintenance personnel and maintenance costs, and shorten the service life of air compressors.

Less protection. There are only three kinds of protections: oil cut-off and over-pressure, and the failure rate is high. It can not ensure the normal operation of the air compressor, and the air volume for the mine cannot be guaranteed.

10,000, 1 no-load consumption of 168,900 wrists 13 technical transformation for the original 屯 屯 松 32380 and the empty claw machine operation 问 exist, we and the electric company related experts conducted an on-site review date 2833 school, long-term engaged in coal mine electromechanical Management work, is currently the deputy director of the Equipment Management Center of Pingyi Coal and Electricity Company.

certificate. A retrofit solution is proposed for the existence of the latching mine jaw machine and the electronic control system.

3.1 Principle of the variable frequency speed control system and the principle of the frequency conversion speed control system. The frequency conversion speed regulation is to adjust the output speed of the AC motor by changing the frequency and voltage input to the AC motor power supply. The frequency converter receives the Ding frequency brother bite from the power grid and rectifies it into a private electric output to the AC motor. Through the program control, the change and operation of the AC motor are realized.

2 thin frequency modulation, the system's composition, the inverter speed system is usually composed of rectifier control inverter and protection system.

A method of transforming a commercial frequency alternating current into a variable frequency alternating current output. Mainly the AC direct conversion frequency conversion method. The frequency conversion method can realize the output of not one sentence frequency. The output AC power and power are both high. It is a small stream of the development of frequency control technology.

3.2 The transformation of the electronic control system combined with the actual operation of the pressure-free machine. The electric control cabinet was transformed into a 013238, variable frequency energy-saving cabinet.

The inverter and the access to the control system are small.

1 Zhanben principle, frequency conversion energy-saving 桁 using advanced frequency control technology. Inside the back can be 1 controller. Take pressure as the control object.

According to the actual needs of the production, the air supply pressure is set in the air compressor. When the pressure of the gas storage tank is high or lower than the set pressure, the pressure sensor uploads the real-time information to the control unit of the inverter to issue an instruction, so that the automatic soft start stops the air compressor. Do not run out of air. Realize the automatic closed loop control of the empty machine.

Good power saving performance and high reliability.

2 realize the mouth mark, the electric effect is remarkable. The annual electricity saving is 68,900 yuan, and the investment can be recovered in 3 months. The constant pressure gas supply is realized in 0, which is beneficial to the production efficiency and quality of the mine, and 3 sliding.

Improve running performance, reduce vibration and heat and noise. Extend the life of the motor. Reduce maintenance workload. Change the working environment. 0, over-current over-clamping road grounding overload fault equal fault protection and display, to ensure the safe operation of the equipment.

4 transformation effect 2007 1 according to the technical indicators and safety performance of the equipment. According to the requirements, the Dingkong load test and the load test are carried out. Empty cargo test. The operation is stable, the indicators meet the design requirements, and there is no fault. Full-speed test with full load, stable operation, no bad sound, no fault, all performance indicators refer to meet the requirements.

1 special, the whole system works well and there is no fault during operation. The safe operation of the press and the normal production of the mine are guaranteed. Practice has proved. This air compressor transformation was a success. The power saving effect is remarkable. All economic and technical indicators have reached the expected level. It is worth promoting.

Responsible editor Yan Haixia was connected to the 63rd page in the process of seeing the degree of surrounding rock fracture, and made temporary support for shotcrete or anchor net. After tunneling, the composite metal formwork was used to continuously connect from the bottom to the top. The inner wall is made of 1 piece combined metal template. During the construction process, the outer wall frost is applied to prevent the molten water from entering the formwork. Causes the water to cement ratio to be too large. Affect the well reinforcement. The support method is the same as the outer wall.

6 Construction under special circumstances. The first stratum is dominated by clay and clay sand. Among them, the thick clay layer, 3 is the thickest up to 54.84 dan and has strong expansion. When passing through the expansive clay layer, the polystyrene foam is placed, and the plate 2 is excavated to release the vertical expansion groove of the frost heave force; Freezing temperature; speeding up the section of the wellbore, the degree of expansion, when the deformation is too fast, the expansion amount is large, the height of the masonry formwork is adjusted to 251.5 flat, and the high-efficiency antifreeze early strength agent is added. Speed ​​up the early strength of the well whistle concrete. For the sand and loose stratum, in order to prevent the sheet gang, speed up the construction speed, shrink the beginning time of the contract, first excavate the net diameter of the wellbore, and the surrounding soil layer of the well is left to be brushed before the vertical mold; if there is a pumping, the well wall cracks, etc. . Additional, wall seat.

6 Conclusion 1 The construction of the thick and deep clay in the Jibei coalfield is frozen. 5 thick viscous layers that passed through. Construction experience, the reference value to be.

2 film dipped in the ground. The geological conditions are frozen construction and excavation construction. And carry out a pumping test. Perform a frozen soil test on the soil section.

The radius of less than 800 adjacent 2 holes and the final hole spacing are not more than 24屯 to meet the design requirements.

4 Controlling the excavation and excavation time is the key to successful drilling, and comprehensive analysis based on a large number of observation data. The department determined the excavation, and avoided the phenomenon that the gangs fell too cold and reduced the construction cost. Guarantee the quality of the factory. Speed ​​up the construction progress.

5 pairs; the construction of the knot is safe, fast and efficient. The close cooperation between freezing and excavation is a major success factor, 1 Way Yaohua Cui Zengqi. China coal mine construction technology. Xuzhou China University of Mining and Technology Press, 1995 responsible editor Qin Aixin

Welding Grinding

If your weld isn't on a piece of metal that will show, or if you don't care about how the weld looks, then you are done with your weld. However, if the weld is showing or you are welding something that you want to look nice then you will most likely want to grind down your weld and smooth it out.

Slap a grinding wheel onto an angle grinder and get started grinding on the weld. The neater your weld was the less grinding you will have to do, and after you have spent a whole day grinding, you will see why it's worth it to keep your welds neat in the first place. If you use a ton of wire and made a mess of things it's ok, it just means that you might be grinding for a while. If you had a neat simple weld though, then it shouldn't take too long to clean things up.

Be careful as you approach the surface of the original stock. You don't want to grind through your nice new weld or gouge out a piece of the metal. Move the angle grinder around like you would a sander so as not to heat up, or grind away any one spot of the metal too much. If you see the metal get a blue tinge to it you are either pushing too hard with the grinder or not moving the grinding wheel around enough. This is can happen especially easily while grinding thing sheets of metal.

Grinding welds can take a while to do depending on how much you have welded and can be a tedious process - take breaks while grinding and stay hydrated. (Grinding rooms in shops or studios tend to heat up, especially if you are wearing leathers). Wear a full face mask when grinding, a mask or respirator, and ear protection. Make sure that all your clothing is neatly tucked in and that you don't have anything hanging down from your body that could get caught in the grinder - it spins fast and it can suck you in!

When you are done your piece of metal might look something like the one in the second photo pictured below. (Or maybe better as this was done by a few Instructables Interns at the beginning of the summer during their first welding experience.)

Step 8: Common Problems

Welding Grinding,Tig Welding Helmet,Welding Grinding Helmet,Metal Welding Grinding

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