BASICS IN STACKER RECLAIMER

In the article titled ‘Undercarriage support structure’ we have discussed that we have to provide a 3/3 undercarriage support for the machine which is operating on an offset yard conveyor. Now the question is, "is it possible to provide a 3/4 undercarriage support instead of a 3/3 undercarriage support for a machine which is operating on an offset yard conveyor"? The answer is ‘YES’. Design a Bucket Wheel Stacker cum Reclaimer machine with a 3/4 undercarriage support which is working on a conveyor which is offset with the axis of the machine. SOLUTION: By providing a 3/4 undercarriage support we will face the following problems, 1. Feeding the material to the yard conveyor during reclaiming operation. 2. Feeding the material to the boom conveyor during stacking operation. 3. Feeding the material to the intermediate conveyor during stacking operation. Let us discuss the solution in 3 parts. a. Undercarriage WITH inclined chute. b. Interme...

It is through the undercarriage the load (of the machine) is distributed to the wheel bogies and to the civil foundation through rails. Undercarriage support structure is designed to transmit the forces to the tracks (through 3 points or 4 points). A 3-point structure may be designed as a 3/3 system or a 3/4 system, whereas a 4-point structure is always designed as 4/4 system. 3/3 & 3/4 support undercarriage: The undercarriage support structure shall designed as a 3/3 support or a 3/4 support based on the system requirement. If the conveyor is offset with the machine axis (or in some cases if there are 2 conveyors between the rails) then the machine shall be provided with 3/3 support undercarriage. If the conveyor is in line with the machine axis then the machine shall be provided with 3/4 support under carriage.   4/4 support undercarriage: If the conveyor is in line with the machine axis then 4/4 support undercar...

Consistency is an important and inevitable factor in any process plant. To meet a consistent quality output of the product (for example steel or cement) the raw material shall be fed continuously for processing in the required ratio. Consider a case in which the raw materials are stored in the stockyard in number of layers and during reclaiming if the consistency in blending is disturbed after sometime of reclaiming. The result will be change in product quality. Case study: Form a stockpile of 40m (Width) x 12m (Height) x 250m (Length) with 6 layers and discuss the consistency (mixture of all 6 layers of material) during reclaiming operation. Machines used for stacking & reclaiming, Stacker       - Luffing Stacker or Twin Boom Stacker Reclaimer   - Bridge Scrapper Reclaimer or Barrel Reclaimer or Wheel on Bridge Reclaimer (Note: above mentioned reclaimers are with harrow arrangement) STOCKPILE: Below sketch shows a stockpile of 40...

Trapezoidal stockpile can be formed in the following two methods, 1.    Without compensating the travel length of the machine. 2.    By compensating the travel length of the machine. Each method has its own advantage and disadvantage. Before comparing the advantages and disadvantages, let us discuss how a trapezoidal stockpile is formed. Without compensating the travel length of the machine: The above figure(s) shows a trapezoidal stockpile formed without compensating the travel length of the machine. By compensating the travel length of the machine: The above figure shows a trapezoidal stockpile formed by  compensating  the travel length of the machine. Travel length compensation: To understand travel length compensation, first let us discuss how a triangular stockpile is formed with the help of a stacking mode drawing. (Stacking mode drawing: Is the drawing which defines the slewing angle, luffing angle and t...

  To run any plant continuously, the basic requirement is the continuous supply of raw material. For example, to run a Thermal power-plant  or Steel plant or an Alumina plant, continuous supply of the raw materials viz., coal / iron ore / bauxite / limestone is required. Unfortunately, it is difficult to guarantee the continuous supply of raw material due to various factors viz., availability of raw material, transporting the raw material (by ship, wagon etc.,) or force majeure. Hence the solution is to store more than the required amount of these required raw materials in the plant itself. ‘Google’ defines stockpile as, ‘a large accumulated stock of goods or materials, especially one held in reserve for use at a time of shortage or other emergency’. Why the raw materials to be stacked and not dumped? It is because of the following limitations, ·        availability of space ·        quant...