Patent EP-0367570-A2 (EP)
Inventor: CAMPBELL JOHN A L
IPC: G01G19/04
Filed: 1989-10-31
Abstract: A system for and method of loading loading particles into railroad cars, whereby the combined weight of the railroad car and the particles does not exceed a maximum permissible weight, wherein a control weight of a railroad car loaded with particles is established, which is less than the maximum permissible weight, including a continuous loading system wherein particles are dischargeable through a discharge end of a mass storage bin, and a batch loading system wherein particles are dischargeable through a discharge end of a weigh bin, the railroad cars continuously moving under the mass storage bin and the weight bin in a direction of travel, and wherein particles are dischargeable through the discharge end of a surge bin into the weigh bin, said method comprising the steps of:
     a) weighing each railroad car prior to loading particles into the railroad car to determine an unfilled weight of each railroad car;   b) comparing the unfilled weight of each railroad car with a preset partial weight to determine a first difference weight for each railroad car and storing each first difference weight along with an associated car identification code uniquely identifying the particular railroad car associated with each first difference weight, the preset partial weight being a weight less than the control weight by an amount sufficient substantially to assure that no railroad car will be overloaded from the mass storage bin by an amount such that the weight of the railroad car loaded with particles exceeds the control weight, and the partial preset weight being as close as possible to the control weight while still substantially assuring that the   partially filled weight of none of the railroad cars exceeds the maximum permissible weight, thereby minimizing the weight of the coal to be loaded by the batch loading system;   c) loading particles from the mass storage bin into each railroad car and terminating the loading of particles from the mass storage bin when about the first difference weight of particles has been loaded into each railroad car;   d) weighing each of the railroad cars after loading the railroad cars with particles from the mass storage bin to determine a partially filled weight of each of the railroad cars and determining a second difference weight equal to the difference between the control weight ght;   e) adjusting the amount of particles loaded into the railroad cars from the mass storage bin in response to the determined second difference weight whereby the amount of particles loaded into the railroad cars from the mass storage bin in as close as possible to the first difference weight;   f) loading particles from the surge bin into the weigh bin prior to unloading particles from the weigh bin into the railroad cars;   g) weighing the particles in the weigh bin as the particles are being loaded into the weigh bin and terminating the loading of particles into the weigh bin when a weight of particles has been loaded into the weigh bin about equal to the second difference weight associated with the railroad car to be loaded with that second difference weight of particles; and   h) loading the second difference weight of particles from the weigh bin into the railroad car to be loaded with that second difference weight of particles.