By-products chiller and method for using same
BACKGROUND OF THE INVENTION 
     Packing plant by-products, such as lungs, kidneys, hearts and other parts generally not consumed by humans, are often sold and used to make pet food. These by-products are initially at the body temperature of the butchered animal when removed therefrom, and are therefore highly susceptible to spoilage. Due to such potential for spoilage, the by-products have a very short life. The warm by-products must be quickly transported from the packing plant which slaughters the animal to the remote processing plant for conversion into pet food. Without such hurried pick up and delivery, the by-products become spoiled and must be discarded. 
     Therefore, it is a primary objective of the present invention to provide an on-site by-products chiller for lowering the temperature of fresh by-products, and thereby reducing potential for spoilage. 
     A further objective of the present invention is the provision of an on-site method and apparatus for chilling by-products which will prolong the life of by-products for further processing. 
     A further objective of the present invention is the provision of a method and apparatus for chilling animal by-products at the point of slaughter such that the by-products can be stored without spoilage prior to being shipped for further processing. 
     A further objective of the present invention is the provision of a method and apparatus for chilling by-products which eliminates the need to quickly transport the fresh by-products from the packing plant to the remote processing plant. 
     Another objective of the present invention is the provision of a by-products chiller and method for using the same wherein by-products are introduced into the chiller and exposed to a liquid coolant which reduces the temperature of the by-products prior to their exit from the chiller. 
     Still a further objective of the present invention is the provision of a by-products chiller and method for using the same which recirculates and reuses the liquid coolant for cooling the by-products therein. 
     A further objective of the present invention is the provision of a by-products chiller and a method for using the same which is economical to manufacture, and durable and efficient in use. 
     SUMMARY OF THE INVENTION 
     The packing plant by-products chiller of the present invention comprises an elongated tank having an inlet end and an outlet end through which fresh animal by-products are passed. The tank is rotatably supported on trunnion wheels and is rotated by a chain and sprocket gear assembly. A liquid coolant from a coolant source is introduced into the tank through a hose adjacent the inlet end thereof or through a plurality of nozzles positioned within the tank along the length thereof. The tank includes a plurality of agitator blades extending along the length thereof to facilitate the tumbling of the by-products within the tank as the tank is rotated. A plurality of apertures in the tank permits the coolant therein to drain into a trough, whereafter the coolant is filtered and pumped back to the coolant source for recooling and subsequent reuse in cooling additional by-products in the tank. 
     The method of preserving the perishable by-products includes introducing the fresh by-products into the chilling tank at the packing plant immediately after the animal has been slaughtered. Low temperature coolant is introduced into the tank which is rotated so as to expose the warm by-products therein to the coolant whereby the by-products are chilled. The by-products are forced through the tank by additional incoming by-products and coolant. The coolant drains through the apertures in the tank and is recirculated for chilling additional fresh by-products. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of the by-products chiller tank of the present invention. 
     FIG. 2 is an end view taken along lines 2--2 of FIG. 1. 
     FIG. 3 is a top plan view of the by-products chiller tank. 
     FIG. 4 is a side elevational view of the by-products chiller tank. 
     FIG. 5 is an enlarged sectional view taken along lines 5--5 of FIG. 2 showing the guidance rollers of the tank. 
     FIG. 6 is a view taken along lines 6--6 of FIG. 4. 
     FIG. 7 is a schematic of the by-products chiller assembly of the present invention. 
     FIG. 8 is a schematic showing an alternate embodiment of the by-products chiller assembly of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The by-products chiller of the present invention is generally designated in FIGS. 6 and 7 by the reference numeral 10. Chiller 10 is located at the packing plant where the animals are slaughtered, and basically comprises an elongated chilling tank 12 rotatably mounted above a drainage trough 14 and a liquid coolant supply source 16. 
     Referring to FIGS. 1-5, tank 12 includes a cylindrical body 18 having a first end 20 with an inlet opening 22 therein and a second end 24 with an outlet opening 26 therein. Body 18 of tank 12 is of single wall construction and has a plurality of apertures 30 therein for draining liquid coolant from the tank. Tank 12 also has a plurality of baffles 31 extending inwardly from the interior of body 18 along the length thereof. 
     Trough 14 includes a large receptacle 32 mounted upon a plurality of legs 34 and positioned beneath tank 12. Each end of receptacle 32 has two pairs of depending ears 36 extending inwardly therefrom, each pair of which supports an axle 38 upon which a trunnion wheel 40 is rotatably mounted. Each pair of trunnion wheels 40 at each end of receptacle 32 are positioned one on each side of the longitudinal axis of tank 12 and support tank 12 for rotation thereon. Legs 34 may be adjustable such that tank 12 may be inclined along its longitudinal axis. 
     Chiller 10 includes a means for rotating tank 12 about its longitudinal axis as it is supported by trunnion wheels 40. The rotation means generally comprises a motor 42 and a chain and sprocket assembly 44. More particularly, motor 42 is mounted upon trough 14 and has a first sprocket 46 conventionally and operatively connected thereto. A second sprocket 48 is fixed about the perimeter of tank body 18. A chain 50 drivingly interconnects first sprocket 46 and second sprocket 48 such that actuation of motor 42 causes tank 12 to rotate about its longitudinal axis. A housing 52 is attached to trough 14 so as to cover first sprocket 46 and at least a portion of chain 50 for safety purposes. 
     Also mounted upon trough 14 adjacent chain and sprocket assembly 44 is a bracket 54 to which are bolted a pair of guide rollers 56, as seen in FIG. 5. Guide rollers 56 engage opposite sides of second sprocket 48 so as to prevent tank 12 from moving longitudinally as the tank rotates upon trunnion wheels 40. As an alternative to brackets 54 and guide rollers 56, bracket 54A can be mounted at each end of tank 12 with a guide roller 56A rotatably mounted thereon, as seen in FIGS. 4-6, for engaging the ends of tank 12 and preventing the tank from moving longitudinally during rotation of the tank on trunnion wheels 40. 
     An inlet chute 58 extends through inlet opening 22 so as to deposit animal by-products from a conveyor 60 to the interior of tank 12. The by-products are removed from tank 12 via an outlet chute 62 extending from outlet opening 26 of tank 12. 
     A coolant supply line 64 extends from coolant source 16 at least to chute 58 and supplies a liquid coolant, such as water, from coolant source 16. In the embodiment shown in FIGS. 1-6, coolant supply lines 64 terminates adjacent first end 20 of tank 12, however, as seen in FIG. 7, line 64 may extend along the length of tank 12 and include a plurality of spray nozzles 66 for uniform distribution of coolant throughout tank 12. 
     Trough 14 also includes a drain 68 for draining coolant from receptacle 32. A coolant return line 70 is connected to drain 68 at one end and to coolant source 16 at the other end. A pump 72 is disposed in return line 70 for pumping coolant from receptacles 32 to coolant source 16. A filter 74 is disposed in return line 70 upstream of pump 72 for removing solids from the liquid coolant. The coolant which is passed through tank 12 and trough 14 is thereby recirculated back to coolant source 16, wherein it is cooled for subsequent reuse in chilling additional by-products. 
     In the packing plant chilling operation, a quantity of fresh animal by-products are deposited on inlet chute 58 from conveyor 60 wherein they pass through inlet opening 22 into tank 12. Liquid coolant at approximately 33° F. from coolant source 16 is also introduced into tank 12 for lowering the temperature of the hot by-products. Tank 12 is rotated upon trunnion wheels by motor 42 and chain and sprocket assembly 44. Such rotation of tank 12 causes the by-products therein to tumble so as to be completely exposed to the lower temperature coolant. Baffles 31 facilitate the tumbling of the by-products. Introduction of additional by-products and coolant pushes the previously introduced by-products through tank 12 and out outlet opening 28 onto outlet chute 62 wherein the by-products are removed for later processing into pet food or the like. 
     As the by-products and coolant moves longitudinally through tank 12, the coolant picks up heat from the by-products, thereby lowering the temperature of the by-products and reducing the potential for spoilage. The warmed coolant drains from rotating tank 12 through apertures 30 and into receptacle 32. The warmed coolant in receptacle 32 can be drained through drain 68 into return line 70 and pumped by pump 72 back to coolant source 16. Coolant source 16 includes a cooling means (not shown) for re-cooling the coolant to approximately 33° F. such that the coolant can be reused to chill additional by-products. At selected periodic intervals, the used coolant can be disposed and replaced with fresh coolant. 
     During the on-site chilling operation of the present invention, the by-products remain in tank 12 for approximately ten to twelve minutes. The coolant temperature entering tank 12 is initially 33° F. such that the final temperature of the by-products exiting tank 12 through outlet opening 26 therein is substantially less than the warm body temperature of the slaughtered animal at which the by-products enter tank 12. The chance of spoilage is therefore minimized and the life of the by-products is prolonged. Thus, the need to rush the warm by-products from the packing plant to the remote processing plant is eliminated. 
     Therefore, it can be seen that the present invention accomplishes at least all of the stated objectives.