How to just calculate memory is good

1. Rest early and get enough sleep. It's better to dream less at night.
after reciting words, lie in bed and recall them in your mind.
reciting them the next day can improve your recitation ability

2. Unknown_Error

3. Mine hoist motor useful synchronous machine, and is low-speed direct connection other excitation synchronous machine, some also choose double winding. The power range is about 1000kw-6800kw. The voltage level is between 690V and 3300v. It's high power.

4. According to the requirements of "mining safety regulations" and "mt407-1995", the integrated backup protection device of hoist (hoist backup protection / winch backup protection) is a backup protection device developed and proced in strict accordance with the requirements of coal mine safety regulations. This device is mainly used for the safety backup protection of mine ground hoist. It adopts imported embedded computer chip assembly, It has the characteristics of accurate operation, simple operation, strong anti-interference ability and complete function. Using modern micro-computer technology to design fully functional and reliable protection electronic instruments, the integrated backup protection device of hoist is mainly used for the safety backup protection of mine ground hoist. It adopts imported embedded computer chip assembly, and has the characteristics of accurate operation, simple operation, strong anti-interference ability and complete functions The functions of the integrated backup protection device of the hoist include: depth indication, speed display, hook count accumulation, dot memory, overspeed alarm, constant speed section overspeed protection, automatic deceleration, deceleration section protection, deep index loss protection, skip blocking protection, signal locking, brake clearance, full bin, rope loosening, over winding protection, fault memory protection, etc. When the power supply is cut off, it can automatically memorize the current parameters, so as to improve the system reliability and monitoring accuracy. It is an ideal comprehensive backup device for mines Main functions: 1. Overspeed protection: braking protection when the constant speed exceeds 15% continuously; 2. 3. Speed limit control: 2m / s protection near the wellhead; 4. Depth indicator failure protection; 5. Overwinding protection: automatic protection when exceeding 0.5m of normal parking position; 6. Skip (can) protection; 7. Loose rope protection; 8. Full warehouse protection; 9. Gate gap protection
10. Direction (signal) blocking; 11. Position (depth) display; 12. Instantaneous speed display; 13. Current signal display; 14. Last signal display; 15. Winch running direction indication 16, sound and light display; 17. Self check function; 18. Reset function; 19. Clearing function; 20. Emergency brake alarm sound release function; 21. When braking, register and display the relevant values at that time Technical indicators: 1. Power supply: AC220V ± 22V 2, signal voltage: AC220V / 127V 3, depth display range: 0 ~ 999.9m accuracy ± 1 m 4, speed display range: 0 ~ 9.99 M / s, accuracy: 0 ± 0.01m/s
this paper is provided by the hoist manufacturer Xinyuan. For more hoist technical information, please refer to: www.tishengjixie.com

5. The traction components of bucket elevator include ring chain, plate chain and belt. The structure and manufacture of the ring chain are relatively simple, and the connection with the hopper is also very firm. When conveying the materials with high grinding property, the wear of the chain is small, but its self weight is large. The plate chain structure is relatively firm, and its weight is relatively light. It is suitable for hoists with large lifting capacity, but the hinge joint is easy to be worn. The structure of the belt is relatively simple, but it is not suitable for conveying materials with high grinding performance. The temperature of ordinary belt materials is not more than 60 ℃ ° C. The temperature of the material is allowed to reach 80 ℃ ° C. Heat resistant tape allows material temperature up to 120 ℃ ° C. The temperature of the materials transported by the ring chain and plate chain can reach 250 ℃ ° C
working principle of bucket elevator
D-type bucket elevator is composed of running part (hopper and traction belt), upper section with transmission drum, lower section with tension drum, intermediate casing, driving device, backstop braking device, etc., which is suitable for upward conveying loose density ρ＜ 1.5t/m3 powdery, granular and small non abrasive and semi abrasive bulk materials, such as coal, sand, coke powder, cement, crushed ore, etc. TD bucket elevator structure: transmission device TD bucket elevator transmission device has two forms, respectively, with YZ recer ZQ (or YY) recer. YZ type shaft recer is directly installed on the spindle head, eliminating the transmission platform, coupling, etc., which makes the structure compact and light. Moreover, it has a special-shaped roller backstop inside, which makes the backstop reliable. The recer has the advantages of low noise, smooth operation and floating with the spindle, which can eliminate the installation stress.