Bulk density gage and bulk density control system
阅读：90发布：2023-04-07
专利汇可以提供Bulk density gage and bulk density control system专利检索，专利查询，专利分析的服务。并且The output of a radioactive source is directed through a moving stream of granular material, e.g., coal on a conveyor, and the radiation passing through is sensed by a detector. The detector generates a pulse signal of which the pulse repetition rate varies with the radiation sensed. The pulses generated are counted in a binary counter, and a timer periodically initiates a read-out of and resets the counter to effect successive counting cycles, whereupon the digital count in each cycle is converted to an analog voltage, the magnitude of which is recorded in terms of bulk density of the coal. The recorder controls the addition of water or oil to the coal to, respectively, lower or increase the bulk density of the coal. Controls are included which guard the system from misperforming when a supply of coal has failed, when the depth of coal on the conveyor belt has been lost, and when the coal is so dense that an application of water is required.，下面是Bulk density gage and bulk density control system专利的具体信息内容。
1. In a system for regulating the bulk density of a granular material by the addition of fluid oil and water to the material, and including means for monitoring the bulk density of the material comprising a radiation source for directing radiation to the material and means for detecting radiation from the material, and means for monitoring the rate of addition of a first one of said fluids to the material, the improvement comprisiNg means jointly responsive to said monitored bulk density and to said monitored fluid addition rate for regulating the addition of the other of said fluids to the material to control bulk density, said regulating means including means for varying the rate of addition of said other of said fluids when the rate of addition of said first fluid is outside a given range.
2. A system as defined in claim 1, wherein said bulk density monitoring means comprises means in response to radiation directed to the material for generating a pulse signal, the pulse repetition rate of which is representative of said bulk density, and means for counting the pulses of the pulse signal for a predetermined time, said counting means being periodically reset so as to count pulses of the pulse signal in successive counting cycles.
3. A system as defined in claim 1, wherein the regulating means includes means for varying the rate of addition of the first one of said fluids in accordance with said monitored bulk density.
4. A system as defined in claim 1, wherein the regulating means controls the addition of water in accordance with the oil addition rate.
5. A system as defined in claim 4, wherein the regulating means controls the addition of water by: (a) decreasing the rate of water addition if the rate of oil addition exceeds an upper limit, and (b) increasing the rate of water addition if the rate of oil addition is below a lower limit.
6. A system as defined in claim 1, wherein the regulating means controls the addition of oil and water by discontinuing all water and oil addition if the monitored bulk density is outside a predetermined range.
7. A system as defined in claim 1, wherein the regulating means discontinues oil addition if the monitored bulk density is outside a preestablished range.
8. A system as defined in claim 7, wherein the regulating means increases the rate of water addition if the monitored bulk density is higher than the bulk densities in the pre-established range.
9. A system as defined in claim 8, wherein said rate of water addition is increased until a maximum water addition rate is achieved or the monitored bulk density returns to said preestablished range within a predetermined time.
10. A system as defined in claim 1, wherein the means for directing radiation to the material includes means for providing radiation of a predetermined portion of the material.
11. A system as defined in claim 10, wherein the means for directing radiation to the material comprises a housing for containing the source of radiation, the housing being positioned above a conveying means which conveys granular material past the radiation source, the distance of the housing above the conveying means determining the thickness of the portion of granular material acted upon by the radiation, the housing including lead shielding to provide a beam of radiation outwardly from the housing, the position of the radiation source within the housing and the extent of the shielding determining the shape of the beam and hence the extent of the portion of material irradiated by the radiation.
12. A system as defined in claim 11, including adjustable means mounting the radiation source within the housing at any of a plurality of positions to control the extent of the portion of material irradiated by the radiation.
13. A system as defined in claim 1, including means for discontinuing fluid addition to the granular material, and means for maintaining the rate of fluid addition to the granular material at the rate prior to discontinuance when the addition of fluid is again continued.
14. A system as defined in claim 1, particularly adapted for the regulation of bulk density of coal supplied to a coke oven, wherein the detecting means comprises a plurality of Geiger-Muller tubes for generating the pulse signal reliably under extreme conditions such as temperature.
15. In a system for regulating the bulk density of a granular material by the addition of fluid oil and water to the material, and including means for monitoring the bulk density of the material comprising a radiation source for directing radiation to the material and means for detecting radiation from the material, and means for monitoring the rate of addition of a first one of said fluids to the material, the improvement comprising regulating means for effecting primary control of bulk density by variation of the rate of addition of said first fluid in accordance with said monitored bulk density, said regulating means including means for varying the rate of addition of said other of said fluids only when said monitored rate of addition of said first fluid is outside a given range.
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