Rotary kiln is composed of main drive system and auxiliary drive system, and kiln and cooler transmission system are relatively simple. Rotary kiln has two drive systems and their roles are:
(1) The main drive system are composed of main motor, reducer, gear, ring gear, and cylinder. When sufficient speed ratio and capacity of the reducer are deficient, you can add a semi-open gear drive between the reducer and gear ring gear, and a small number of kilns can be added a belt drive between the motor and reducer.
(2) The role of the auxiliary drive is to rotate the kiln on a regular basis when the main motor or the main power go wrong, in order to avoid the bending of rotary kiln caused by the temperature difference between the top and bottom of it, and to ensure that the cylinder can stay in a given location in the brickwork or maintenance. The prime mover of the auxiliary drive, the majority of which is the motor, is power-supplied by the power different from the main motor and can also use Internal combustion engine to dispense with a power supply. There is an auxiliary reducer between the auxiliary motor and main gear box, the role of which is to achieve the request of the increase of speed ratio.
(3) Auxiliary motor should be equipped with brakes to prevent kiln’s reversal caused by the emphasis of materials and bricklaying when the motor stops. The kiln reversal rate is often close to or above the normal speed, if at that time the auxiliary drive is not torn off and the reducer will become an accelerator, in that case the speed of auxiliary reducer and the motor will be over the nomal speed and reach a million revolutions per minute, so as to cause danger . Therefore, the brake and auxiliary motor must be turned on or power out at the same time. The brake can use the electromagnet type orYWZ-hydraulic push rod brake. Because of the bad bearing lubrication of chocks, wheel and drive part in the low speed, prolonged use of the auxiliary drive is not suitable and generally the continuous operation should not be more than 15 minutes.
(4) It is equipped with clutch between the output shaft of the auxiliary reducer and the into shaft of main gear box, and its role is to separate the auxiliary transmission and main drive when the kiln operates nomally. There are no special requirements on the clutch, the common types are helical gear (Jaw) and the dowel pin type, and overrun the (one-way) clutch can also be used . Overrun clutch can introduces the auxiliary motor torque into the main gear box, and at that time if main motor drives the drive shaft of main gear box by higher speed in the same direction, the clutch will be in the disengaged position and play the role of separating.
(5) In addition to the use of the overrun clutch, the main motor and auxiliary motor cannot rotate at the same time if the clutch is not in the disengage state. To this end, the electrical chain is required between the two machines. In order to ensure the safety and reliablity of operation, there should be a mechanic-electrical interlock between the clutch and main motor to prevent the start of main motor when the clutch is not disengaged.
Subscribe to Machinery News and keep up to date with all our activities and events.
