The tensioning device is an indispensable component of the belt conveyor. When the overall arrangement of the belt conveyor is selected, selecting a suitable tensioning device to determine a reasonable installation position is an important condition for ensuring the starting and normal operation of the conveyor. ZYL type self-control hydraulic tensioning device is based on the characteristics of China's belt conveyor, absorbs the world's advanced technology, and fully considers the different needs of the belt conveyor during the starting and normal operation.
1 Tensioning device structure and application characteristics Heavy hammer tensioning device. The device utilizes the weight of the weight to generate a tensioning force and ensures a constant tension of the conveyor belt under various working conditions, and can automatically compensate for the elongation change of the conveyor belt due to temperature changes and wear. The utility model has the advantages of simple structure, reliable work and small maintenance, and is an ideal tensioning device; the disadvantage is that the occupied space is large, and the tension in the work cannot be automatically adjusted.
Fixed tensioning device. The tensioning roller is fixed in position during the operation of the conveyor, and the adjustment of the tensioning stroke has two forms: manual and electric. The utility model has the advantages of simple and compact structure and reliable operation; the disadvantage is that the elastic deformation and plastic elongation of the conveyor belt cannot be timely compensated during the operation of the conveyor, thereby causing the tension to decrease, which may cause the conveyor belt to slip on the transmission drum. Commonly used fixed tensioning devices include a screw tensioning device and a wire rope-small winch tensioning device.
Automatic tensioning device. The utility model relates to a tensioning device capable of automatically adjusting the tensioning force according to certain requirements during the working process of the conveyor, which can make the conveyor belt have a reasonable tension diagram and automatically compensate the elastic deformation and plastic deformation of the conveyor belt; the disadvantage is that the structure is complicated. Large size and so on.
ZYL type self-control hydraulic tensioning device has good dynamic performance, high reliability, compact structure and simple operation. It is an ideal equipment for belt conveyor tensioning. Its main features are: 1 to improve the dynamic force effect of the belt conveyor during operation, especially when the tape is subjected to sudden load; 2 can be adjusted according to the actual needs according to the different tension during starting and normal operation. 5至1.5å€çš„è¦æ±‚。 The starting tension is 1.3 to 1.5 times the normal operation. Once the electro-hydraulic system is set, it will automatically work according to the predetermined procedure, so that the conveyor can run under ideal working conditions; 3 fast response. When the conveyor is started, the loose belt of the conveyor belt will suddenly loosen and elongate, causing “strapping†and impact. At this time, the tensioning device can quickly shrink the oil cylinder, absorb the elongation of the conveyor belt in time, thereby alleviating the impact of the conveyor belt, so that the starting process is smooth and avoiding the occurrence of a broken belt accident; 4 the protection function of the conveyor is automatically stopped when the belt is broken; The compact structure and small installation space make it easy to use underground.
2 Self-controlled hydraulic tensioning device structure and principle ZYL type self-control hydraulic tensioning device is suitable for tensioning of long-distance belt conveyor, mainly by tensioning cylinder, hydraulic pumping station, energy storage station, slow winch, mine explosion-proof It consists of six parts: intrinsically safe electrical control switch and pull-in attachment.
The working principle of the hydraulic system: When the isolation handle is closed, the system is in standby state. The oil pump motor is started under manual conditions, and the oil discharged from the oil pump is sucked from the oil tank through the coarse filter. When the manual reversing valve spool is in the neutral position, the oil discharged from the oil pump passes through the fine filter to the reversing valve, and then returns to the fuel tank, that is, the oil pump does not supply the pressurized oil to the system, and the oil pump is in the unloading condition. When the manual reversing valve is in the right position, the pressure oil discharged from the oil pump enters the rod cavity on the right side of the cylinder through the reversing valve, the hydraulic control check valve and the shut-off valve, and pushes the piston to the left to pull the tensioning trolley to Tension the conveyor belt. During this process, the oil return to the left side of the cylinder without the rod chamber is returned to the fuel tank via the reversing valve. When the cylinder can no longer pull the tensioning trolley to move, the pressure oil discharged from the oil pump enters the accumulator and continuously raises the oil pressure until the system pressure rises to the set pressure of the overflow valve armor, and the overflow valve arm opens the overflow. .
After the conveyor is started, it is transferred to normal and stable operation. At this time, the electromagnetic reversing valve is de-energized, the spool returns to the left valve position, and the return line of the relief valve B is connected to the fuel tank. The system oil pressure drops to the setting value of the relief valve B. The YJi and YJ2 pressure relays have a smaller operating pressure value, so the electromagnetic reversing valve is reset, and the system pressure oil makes YJ! action. When the system is in automatic working condition, its contact point KP causes the oil pump motor to stop working automatically. Due to the plastic elongation of the conveyor belt and the leakage of oil in the hydraulic system, the oil pressure in the cylinder chamber of the cylinder will continue to decrease. When the pressure drops to the action recovery pressure of YJ2, its contact KP2 causes the oil pump motor to restart, and the oil pump supplies oil to the cylinder cavity and raises its pressure. When the pressure rises to the operating pressure of YJ, YJ acts again and stops the oil pump motor. After a period of time, the pressure drops to the operating pressure of YJ2, the oil pump motor http: / turn down the 39th page of the Shishi Miao Xue machine mining department pUbus started up again, so automatic anti-2.2 German Luqi company MTP technology German Lu The MTP process developed by Qiqi Company uses a stable molecular sieve catalyst and a fixed bed reactor to operate at a pressure of 0.130.16 MPa and a temperature of 380 to 480 ° C. The catalyst provided by Southern Chemical Company (Sudchemie) has high propylene selectivity and low Coking and low propane yield. The feedstock methanol is passed to an adiabatic dimethyl ether (DME) pretreatment where methanol is converted to DME and water. Highly active, highly selective catalysts bring the reaction close to thermodynamic equilibrium. The methanol/DME/water stream enters the first MTP reactor where steam is added simultaneously and the methanol/DME is converted to more than 99% propylene. The reaction continues in the second and third MTP reactors. The product mixture is cooled and separated to obtain a gaseous product, an organic liquid and water. The gas product is compressed to remove traces of water, CO2 and dimethyl ether to obtain 97% pure chemical grade propylene. The olefin-containing stream is returned to the main synthesis circuit to increase propylene production, and fuel gas, LPG and gasoline are also produced by-product.
Lurgi proposed a plant scale of 1.66 million / a methanol feedstock.
Its simple technical and economic analysis: product quantity: propylene 519,000 gasoline 143,000 t / a, liquefied gas 690,000 t / a, evaluation price basis according to raw material methanol price of 90 US dollars /, propylene 400 US dollars /, internal rate of return 20% 3 Conclusion Methanol is used as two routes for olefins. Among them, domestic and UOP/Hedero's technical route products include ethylene, propylene, butene, liquefied gas, fuel gas (methane, ethane, hydrogen), and subsequent product processing. The added value is high, and the downstream product development space is large. According to the market conditions, it is suitable for the production of high-value added fine chemical products. Luqi Company produces propylene, gasoline and liquefied gas technologies, and propylene is the leading product. The price and added value of liquefied gas and gasoline are not too high.
According to the forecast of the State Economic and Trade Commission, polyethylene and polypropylene are the key raw materials for strategic chemical industry in the country until the next 10 years, and there is no risk of market sales.
China has more coal, less oil and less gas, rich coal resources, and a coal-based large methanol plant with a capacity of 1.7 million t/a or above. The cost of methanol will be relatively low. The methanol production process will be used to convert methanol to ethylene and propylene. It can also produce deep-processed polyethylene and polypropylene products. The product chain extends downstream to increase the added value of products and maximize the economic benefits.
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