Method and apparatus for making battery paste
First Claim
1. In battery paste making equipment for mixing selected quantities of lead oxide, sulfuric acid and water to form a viscous mixture, control apparatus comprising:
- temperature sensing means for determining the temperature of the mixture;
viscosity sensing means for determining the viscosity of the mixture;
valve means for admitting water to the mixture;
coincidence means responsive to said temperature sensing means determining the temperature of the mixture to be a minimum temperature or above and to said viscosity sensing means determining the viscosity of the mixture to be at or above a maximum acceptable value of viscosity, for activating said valve means to admit water to the mixture until the viscosity thereof is reduced to a value below the maximum acceptable value, whereupon said viscosity sensing means disables said coincidence means, thereby de-activating said valve means.
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Accused Products
Abstract
Control apparatus and a method for making battery paste by mixing selected quantities of lead oxide, sulfuric acid and water to form a reaction mixture are disclosed. During the reaction portion of the process, the viscosity of the mixture initially descends on a time-viscosity curve, which then changes in slope to reach a point of minimum viscosity. The temperatures of the reaction mixture form a time-temperature curve having a temperature peak therein. The temperature and the viscosity of the reaction mixture are determined respectively by temperature sensing devices and by viscosity sensing devices. In response to the temperature of the reaction mixture rising to a predetermined temperature or above as determined by the temperature sensing devices and to the viscosity thereof being at or above a predetermined value as determined by the viscosity sensing devices, coincidence devices actuate a valve controlled water supply to add a quantity of water to the reaction mixture, until the viscosity thereof is reduced to a value below the predetermined value. The predetermined temperature corresponds approximately to at least one of (a) a temperature at which a predetermined time-viscosity curve reaches a point adjacent to the minimum viscosity, and (b) a temperature at a point on a predetermined time-temperature curve which corresponds to said predetermined time-viscosity curve, a point adjacent to and below its peak. The water content of the reaction mixture is adjusted thereby, as needed, so as to approximate the water content desired in the final product.
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Citations
15 Claims
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1. In battery paste making equipment for mixing selected quantities of lead oxide, sulfuric acid and water to form a viscous mixture, control apparatus comprising:
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temperature sensing means for determining the temperature of the mixture; viscosity sensing means for determining the viscosity of the mixture; valve means for admitting water to the mixture; coincidence means responsive to said temperature sensing means determining the temperature of the mixture to be a minimum temperature or above and to said viscosity sensing means determining the viscosity of the mixture to be at or above a maximum acceptable value of viscosity, for activating said valve means to admit water to the mixture until the viscosity thereof is reduced to a value below the maximum acceptable value, whereupon said viscosity sensing means disables said coincidence means, thereby de-activating said valve means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. In a method of making battery paste by mixing selected quantities of lead oxide and water to form a mixture the viscosity of which ascends on a time-viscosity curve, and then admixing a selected quantity of sulfuric acid to form a reaction mixture the viscosity of which initially descends on such curve, the curve then changing in slope to reach a point of minimum viscosity, the temperature of said reaction mixture forming a time-temperature curve having a temperature peak therein at a time subsequent to acid addition, the steps which comprise:
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sensing the temperature of said reaction mixture, sensing the viscosity of said reaction mixture, and adding a quantity of water to the reaction mixture when the temperature thereof rises to a predetermined temperature or above and the viscosity thereof is at or above a predetermined value, until the viscosity is reduced to a value below the predetermined value, said predetermined temperature corresponding approximately to at least one of (a) a temperature at which a predetermined time-viscosity curve reaches a point adjacent to said minimum viscosity, and (b) a temperature at a point on a predetermined time-temperature curve which corresponds to said predetermined time-viscosity curve, at a point adjacent to and below its peak, whereby the water content of the reaction mixture is adjusted so as to approximate the water content desired in the final product. - View Dependent Claims (14, 15)
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Specification