China Baowu Iron and Steel Group Co., Ltd. has an annual steel production capacity of about 30 million tons, and its profitability ranks in the world's leading position. Its products sell well in domestic and foreign markets. On December 14, 2006, Standard & Poor's announced that the long-term credit rating of Baosteel Group and Baosteel Co., Ltd. would be upgraded from "BBB+" to "A-". This is currently the highest long-term credit rating among global steel companies and the highest rating among Chinese manufacturing.
Among the global steel companies, only Baosteel and South Korea's Pohang can obtain an "A-". Among the six Chinese companies that have obtained credit ratings of "A-" and above, Baosteel is the only manufacturing company and continues to lead the way among domestic outstanding companies. Baosteel is the most competitive steel conglomerate in China and a global partner and total steel supplier for the 2010 Shanghai World Expo. In 2009, Baosteel’s total operating income was 195.3 billion yuan, total profit was 14.9 billion yuan, total assets were 402 billion yuan, and net assets were 243 billion yuan; Baosteel’s total number of employees was 106,914; in 2010, Baosteel was selected by Fortune magazine for the seventh consecutive year Of the world’s top 500 companies, ranked 276th, and was named the "World's Most Admired Enterprise" in 2009, becoming the only company in Mainland China to receive this title.
Baosteel produced 38.87 million tons of steel in 2009, ranking third among global steel companies. The Baosteel brand ranks 12th in the 2010 "Top 500 Chinese Brands" list compiled by the World Brand Value Lab, with a brand value of 76.512 billion yuan.
The reducer is a commonly used power transmission mechanism. The speed reduction mechanism reduces the higher speed to the required speed and obtains a larger torque. In the current mechanism used to transmit power and motion, the application range of the reducer is quite wide. It can be seen in almost all kinds of mechanical transmission systems, from ships, automobiles, locomotives, heavy machinery used in construction, processing machinery and automatic production equipment used in the machinery industry, to common daily life Home appliances, clocks and watches, etc. Its applications range from large power transmission work to small load and precise angle transmission. The application of reducers can be seen. In industrial applications, reducers have the function of reducing speed and increasing torque. Therefore, it is widely used in speed and torque conversion equipment.
The main functions of the reducer are:
(1) Decrease speed and increase output torque at the same time. The torque output ratio is the motor output multiplied by the reduction ratio, but it must be noted that the rated torque of the reducer cannot be exceeded.
(2) Deceleration reduces the inertia of the load at the same time, and the reduction in inertia is the square of the reduction ratio.
Common types of reducers are: gear reducers, worm gear reducers, cycloid pinwheel reducers, planetary gear reducers, stepless speed reducers, etc.
Reducers are widely used in iron and steel production enterprises. At the same time, due to the relatively harsh environment of use, problems such as wear of the bearing position in the bearing chamber and oil leakage on the joint surface of the reducer occur from time to time during operation. Due to the high degree of automation and continuity of modern steel production, once the above problems occur, without advanced maintenance methods, it will inevitably result in waste of manpower and financial resources, and even the entire production line will stop production, causing significant economic losses.
Case 1: Wear of bearing chamber of 650-ton cold shear
The bearing chamber of the reducer of the cold shear is worn. After the problem occurs, the traditional method cannot be solved on the spot. It must be repaired by outsourcing. It requires a long time to stop production and waste the company's valuable production time. Moreover, metal is used to repair metal, which cannot change the "hard-to-hard" coordination relationship. Under the combined action of various forces, it will still cause re-wear.
Fu Shilan 2211F polymer composite material has super adhesion, excellent compressive strength and other comprehensive properties. The use of 2211F polymer composite material can avoid disassembly and machining, and quickly and effectively repair the wear of the bearing chamber. That is to say, there is no thermal stress of repair welding, and the repair thickness is not limited. At the same time, the product has a retreat that the metal material does not have, absorbs the shock and vibration of the equipment, and avoids the possibility of wear again.
Case 2: Leakage on the joint surface of the reducer
During the long-term operation of the reducer, due to vibration, abrasion, pressure, temperature, and repeated disassembly and assembly, oil leakage at the static seal of each joint surface is very common, resulting in a large amount of waste of oil, and affecting the site of the enterprise management. The traditional treatment method is to disassemble and open the reducer, replace the sealing gasket or apply the sealant, which is time-consuming and laborious, and it is difficult to ensure the sealing effect, and leakage will occur again during operation.
The use of Fuschlan, Fuschlan 25551 fast curing repair agent and Fuschlan 3223 high-strength modified polyurethane rubber composite materials and technology for on-site treatment of leakage, without disassembly, using polymer composite materials to treat leakage externally, saving time and effort, and the effect is immediate. Its products have superior adhesion, oil resistance and 350% elongation, overcome the impact of the vibration of the reducer, and solve the problems that have not been solved for many years.
DBY two-stage transmission conical cylindrical gear reducer
The conical cylindrical gear reducer (hereinafter referred to as the reducer) is used for transmission devices in which the input shaft and the output shaft are arranged in a vertical direction. Mainly used in belt conveyors and various transportation machinery, but also in the transmission mechanism of various general machinery such as coal, metallurgy, mining, chemical industry, building materials, light industry, petroleum and so on.
Model:
DBY160, DBY180, DBY200, DBY224, DBY250, DBY280, DBY315, DBY355, DBY400, DBY450, DBY500, DBY560
Speed ratio 8, 10, 11.2, 12.5, 14
1. The use, performance characteristics and model marking of the reducer
1.1 Purpose
The conical cylindrical gear reducer (hereinafter referred to as the reducer) is used for transmission devices in which the input shaft and the output shaft are arranged in a vertical direction. Mainly used in belt conveyors and various transportation machinery, but also in the transmission mechanism of various general machinery such as coal, metallurgy, mining, chemical industry, building materials, light industry, petroleum and so on.
1.2 Performance characteristics
High carrying capacity, low noise, small size, light weight, high efficiency and long service life.
1.3 Parameter range
DBY, DBYK, and DBZ reducers each have 12 specifications, and the nominal center distance is: 160, 180, 200, 224, 250, 280, 315, 355, 400, 450, 500, 560mm. Each specification has 5 transmissions. Compared with (8, 10, 11.2, 12.5, 14) two rotation directions, four assembly types, respectively, make up 240 kinds of reducers.
There are 15 specifications for DCY, DCYK, and DCZ reducers. The nominal center distance is: 160, 180, 200, 224, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710, 800mm; each Each specification has 11 transmission ratios (16, 18, 20, 22.4, 25, 28, 31.5, 35.5, 40, 45, 50), two rotation directions, four assembly types, and 660 types of reducers.
This series of reducers can meet the power requirements of TD and DX belt conveyors and other transportation machinery in the working range of 0.8-6.5m/s belt speed.
1.4 Structure
Lubrication of reducer: Under normal circumstances, gears and bearings of reducer are lubricated by splashing oil pool and cooled naturally. Only when the working equilibrium temperature of the reducer exceeds the specified value, or the carrying power exceeds the thermal power PG1, the oil pool with cooling pipe is used for lubrication.
1.5 Model and marking
The model of the reducer is composed of type code, nominal center distance a (center distance of the final stage), nominal transmission ratio, assembly type code, and input shaft rotation direction code.
D-belt conveyor group code, B-two-stage transmission, C-three-stage transmission, Y-hardened gear, Z-medium hardened gear, K-output shaft is a hollow shaft.
Nominal center distance: expressed by actual numbers, the unit is mm
Transmission ratio: expressed by the nominal transmission ratio.
Assembly type: indicated by Roman numerals I, II, III, IV.
The direction of rotation of the input shaft: When looking at the direction of the input shaft, S is clockwise and N is counterclockwise.
Markup example:
The nominal center distance is 280mm, the nominal transmission ratio is 10, the assembly type is Type III, and the input shaft is clockwise rotating. The mark of the three-stage transmission reducer is: reducer DBY280-10-III S
