1. The selection of drive power.
Heavy duty trough chain conveyor of bulk grain in port has large conveying capacity, long conveying distance and large driving power, so the calculation results should be revised according to the specific situation. First of all, the feeding situation should be considered, such as the quantity, size and position of the feeding port. The feeding resistance should be calculated according to the hydraulic radius of the feeding port and the height of the silo at the bottom of the warehouse.
2. Problem of head materil stock
One of the main reasons for the use of trough chain conveyor in port bulk grain conveying system is that it can be conveniently arranged for multi-point unloading when the unloading port of the machine head is closed. When unloading the material at the middle unloading port, the main way to solve the material accumulation at the head is to set a aggregate scraper (return hopper) on the scraper chain to return the material taken to the head to the discharge port. In addition, a suitable middle unloading port should be opened. Arrangment of aggregate scraper (return hopper) according to the return hopper effective aggregate volume reasonable layout spacing, the length of the middle unloading mouth to include the top material unloading parabola.
3. Special measures for inclined arrangement
Inclination
trough chain conveyor to convey bulk grain. When the inclination angle is larger than 5°, measures need to be taken to achieve conveying capacity; When the inclination angle is 5° ~ 10°, the influence of the inclinaton angle on the conveying efficiency and the spacing between the scraping plates should be considered, while the inclination angle is 10° ~ 15°, the scraper with special structure should be adopted and the influence of the inclination angle on the conveying efficiency should be considered. When the inclination angle is greater than 15°, the roller gallery scraper shall be adopted and the influence of the inclination angle on the conveying efficiency shall be considered.
4. Selection of motor
For the port bulk grain trough chain conveyor, dust explosion-proof asynchronous motor should be used. According to the nature of bulk grain dust at the port, the maximum surface temperature allowed by the motor should not be higher than 120℃. The motor housing should be grounded reliably and the rain cover should be added for outdoor arrangement.
5. Selection of coupler
Special attention should be paid to the installation and connection of hydraulic couplings. Generally speaking, coupler has two installation methods, one is installed on the reducer shaft, the elastic coupling on the side of the motor; The other is mounted on the motor shaft, the elastic coupling on the side of the reducer. For the hard tooth surface reducer, especially the vertical shaft reducer must choose the hydraulic coupling with elastic coupling, so that the quality of the coupling by the motor shaft to bear.
6. Selection of reducer
Reducer is mostly use hardened gears reducer, there are 2 shaft form, parallel shaft and direct delivery shaft. The host can be connected directly, and through open transmission can also be selected. In short, the specific layout should consider the comprehensive cost. Generally speaking, the use of open transmission layout can reduce the cost of the reducer, but the trough chain conveyor distribution space is limited, such as the layout in the steel plate warehouse top pier, the use of direct link type reducer cost is higher, but can greatly reduce the cost of the base steel structure in the pit layout can greatly reduce the cost of civil construction.
7. Installing the safety protection device
(1) The head of
trough chain conveyor should install a anti-blocking switch; When the head material accumulation is too much, because of the role of the plug switch, will automatically stop; (2) when the use of single row chain, the tail of the installation of speed detection device; It mainly plays the role of chain break protection, can also prevent overload. However, this method cannot be adopted in the case of double-row chain (when the single chain is broken, the tail shaft turns as usual), and each row of chain should be detected separately in the appropriate position of the nose (a loose chain detection device is set at the upper cover plate of the head). (3) coupler should use two grade oil temperature alarm. (4) In the scraper cover plate (including the head, tail, middle section) the appropriate position should set the vent, the gap between the two vent is about 6 m.
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