At present, horizontal vibration centrifuge and vertical scraper centrifuge are centrifugal dehydrators commonly used in industry. The working principle, structure and performance of two centrifugal dehydrators are introduced. Analyze the common failures of the two centrifuges in use, and propose a solution to the problem. 12 kinds of centrifuge working principle and structural performance comparison 1.1 Comparison of working principles Working principle of vertical scraper centrifuge: After a certain concentration of coal-water mixture enters the centrifuge, it is distributed into the gap between the screen basket and the scraper through the distribution plate.Under the action of centrifugal force, the water splashes through the screen through the material layer To the inner lining board of the upper cover, flow into the sump of the machine base along the lining board, and exit the body through the filtrate pipe. The solid phase material accumulated in the inside of the screen basket utilizes the speed difference between the screen basket and the scraper, which is scraped down by the scraper along the screen basket to the bottom of the screen basket, and discharged through the bell-shaped cover and the outlet cone as shown in FIG. 1. The working principle of horizontal vibrating centrifuge (see Figure 2): The material enters the bottom of the sieve basket through the feed pipe along the sieve base.The material in the sieve basket is closely attached to the sieve surface by the centrifugal force.Under the action of the vibration force, the material layer is uniform Moving towards the large end of the screen basket, the dehydrated material is thrown out from the large end of the screen basket, falls into the discharge port in the lower part of the cabinet, and is discharged downward. Under the action of centrifugal force, the water in the material is thrown around the casing through the material layer and the screen slot, and discharged to the drain along the inner wall. The working principle of the above two centrifuges is the action of centrifugal force, separating coal and water through the screen slot. The main difference is that the feeding and discharging methods are different. The vertical scraper centrifuge feeds from the small end of the screen basket, and discharges by the difference in speed between the screen basket and the scraper, while the horizontal vibrating material is fed from the feed pipe at the large end of the screen basket.The discharge method is based on the reciprocating excitation force Nesting. 1.2 Structural comparison At present, most of the TTL vertical scraper centrifuges used in China are mainly composed of the dehydration part, the transmission part and the lubrication system, as shown in Figure 1. The dewatering part mainly includes the screen basket, spiral scraper, bell-shaped cover and cloth cone, etc .; the transmission system is composed of a first-level triangle belt transmission and two pairs of helical gear transmission. The vertical motor rotates the intermediate shaft through the V-belt drive.The intermediate shaft is equipped with gears with different numbers of teeth, which are respectively meshed with the gear on the outer shaft and the gear on the mandrel, so that the spiral scraper and the screen basket maintain the same direction of rotation. Appropriate speed difference. The horizontal vibrating centrifuge consists of a rotating part, an exciter, a screen basket, a machine body, and a lubrication system, as shown in Figure 2. Rotating part: The main motor drives the screen basket to rotate through the pulley and the main shaft.The main shaft is supported on the box by a pair of main bearings; the vibrator uses a vibration motor as the excitation source, and the vibration motor generates a horizontal excitation force to make the screen basket together The vibration parts of the box and the main shaft produce horizontal vibration together. The amplitude is adjusted by changing the angle of the two eccentric blocks on the vibration motor to adapt to the changes in feed material and process requirements. The box and the casing are connected to the frame through rubber springs to participate in vibration. A vibration isolation rubber spring is provided under the frame for vibration reduction. Both centrifuges are forcibly lubricated with thin grease. The main purpose of the lubrication system is to lubricate the rotating bearings and reduce the working temperature of the bearings, maximizing the service life of the bearings. 1. Performance comparison of 32 centrifuges From the perspective of development trends, countries around the world are actively developing horizontal vibration centrifuges.Compared with vertical scraper centrifuges, they have the following advantages: (1) High efficiency. When the feeding strength is similar, the horizontal vibrating centrifuge The loss of coal in the heart fluid does not exceed 4%, while the vertical scraper discharge centrifuge reaches 6%. (2) Fewer wearing parts and low coal crushing rate. (3) Large processing capacity and large upper limit of feed particle size. The processing capacity of the horizontal vibration centrifuge can reach 350t / h, and the feeding granularity can reach 50mm. (4) Reduce the height of the workshop, small maintenance space, and easy maintenance. The vertical scraper centrifuge uses scraper to discharge, with low vibration and stable operation. In addition, from the perspective of economy and dehydration effect, it is obviously superior to horizontal vibration centrifuge. 22 common faults and troubleshooting methods In the process of putting into production and use, some common faults will inevitably appear. The design of horizontal vibrating centrifuge has taken into account the defects of vertical scraper centrifuge at the beginning of its design. Therefore, the maintenance and repair of horizontal vibrating centrifuge is much less than that of vertical scraper centrifuge. (1) Lubrication system failure ①There is no oil pressure or the oil pressure is too low After confirming that the oil pump motor is turned correctly, if there is no oil pressure display, you should check whether the oil filter is blocked.After confirming that the oil filter is no problem, check whether the pressure gauge is damaged. If there is no oil pressure display, you should further check whether the oil pipes and joints are well connected and whether they are loose or broken. You should also consider whether the oil pipes are smooth. ②The oil pressure is too high Failure analysis: Check whether the appropriate mechanical oil is added to the oil tank according to the requirements of the equipment manual. If there is no problem with the added mechanical oil, check whether the pipelines are blocked. If they are blocked, use compressed air to blow off the impurities in the pipeline. (2) Run coarse: the content of large particles in the centrifuge increases For horizontal vibrating centrifuges, the screen basket is worn out, and a new screen basket needs to be replaced. The vertical scraper centrifuge, except for the sieve basket wear and tear, feed inlet wear and outlet protection ring wear and tear will cause rough running. (3) Unloading is unsatisfactory, the processing capacity becomes smaller or the material is blocked Failure analysis: In the case of horizontal vibration centrifuge with the same excitation force, if the feeding is not smooth, the processing capacity becomes smaller or the material is blocked, the coal quality changes and the amount of slime is too large. The vertical scraper centrifuge should check whether the bell cover and the machine base are blocked by small particles of clean coal. If it is blocked, clean the clean coal at the blockage and then start the car. (4) Excessive vibration of the centrifuge Failure analysis: The reasons for excessive vibration during horizontal vibration centrifuge use are: ①the screen basket is blocked, worn out or deformed; ② the spring of the exciter is aging. The screen basket or spring needs to be replaced. The reasons for the excessive vibration of the vertical scraper centrifuge are: ①the dynamic balance of the rotating part is unbalanced or the foundation frame is too soft; ② the screen basket is blocked or worn out; ③ the vibration damping spring is loose or damaged; ④ the feeding is uneven and discontinuous. (5) Abnormal noise occurs ①Check whether the oil circuit is normal; ②Check whether there is foreign matter entering the body; ③Check whether the belt is damaged or fall off; ④The bearing is damaged, and a new bearing needs to be replaced. ⑤ The gear is toothed or damaged, and needs to be repaired or replaced. 3 Conclusion Compared with the vertical scraper discharge centrifuge, the horizontal vibration centrifuge has the advantages of large processing capacity, less wearing parts, space saving and convenient maintenance. However, at present, the domestic horizontal vibration centrifuge technology is not mature enough, the stability is not high, and the adaptability to material changes is poor, and the majority of centrifuge R & D personnel still need to actively explore. (Organized by China Educational Equipment Purchasing Network)
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Packing will by pallet/carton/ wooden box,according to different demand.
Bronze Sculpture,Bronze Statue,Bronze Garden Ornaments Henan Jinbailai Industrial Co.,Ltd , https://www.jblbbqgrill.com
Name
Outdoor Landscape Statues Bronze sculpture
Material
Bronze
Size
Customized
Weight
100KG
Packing
wooden
