US3592358A

US3592358A - Dispensing system

Info

Publication number: US3592358A
Application number: US846714A
Authority: US
Inventors: George P Lugsdin
Original assignee: Eastman Kodak Co
Current assignee: Eastman Kodak Co
Priority date: 1969-08-01
Filing date: 1969-08-01
Publication date: 1971-07-13
Anticipated expiration: 1988-07-13
Also published as: CA933499A

Abstract

Articulated apparatus for dispensing chemicals, or the like, into a vessel is disclosed. Dispensing of such chemicals can only occur if the position of the dispensing apparatus is complemented by a predetermined condition for the vessel, or its contents. The disclosure indicates the use of a ''''program'''' circuit which allows various quantities of chemicals to be mixed in accordance with a certain time sequence for the respective chemicals; and such mixing may occur without the attendance of a technician.

Description

United States Patent POSITION CONTROLLER DISPENSE CONTROLLER MIXING TANK 3,094,247 6/l963 Marchi 222/54 3,189,014 6/l965 Kus. 222/54 X 3,221,936 12/1965 Spinozza 222/54 FOREIGN PATENTS 944.359 6/1956 Germany 2l2/Pl-l Primary Examiner-Robert B. Reeves Assistant ExaminerT. E. Kocovsky Attorneys-Walter O. Hodsdon and Robert F. Cody ABSTRACT: Articulated apparatus for dispensing chemicals, or the like, into a vessel is disclosed. Dispensing of such chemicals can only occur if the position of the dispensing apparatus is complemented by a predetermined condition for the vessel, or its contents. The disclosure indicates the use of a program circuit which allows various quantities of chemicals to be mixed in accordance with a certain time sequencefor the respective chemicals; and such mixing may occur without the attendance of a technician.

CEILING PA PA DISPENSE K-- l LOAD PATENTH] JUL 1 3 1911 saw 1 or z NN M VN-A

H H H V PAIENIEB JUL 1 3 m4 sum 2 or 2 A TTORNEYS LQilu t DISiENSING SYSTEM BACKGROUND OF THE INVENTION 1. Field ofthe Invention This invention relates in general to systems for mixing chemicals, or the like. In particular, the invention provides positionable dispensing apparatus which may be easily stored and loaded; and which dispensing apparatus becomes operative when a certain of its positions is complemented by a given condition for a mixing tank (or its contents) into which such apparatus is to discharge its load. In its presently preferred form, apparatus according to the invention includes respective dispensers for the various chemicals, each such dispenser being programmed to discharge its respective load at a respective time, but only provided the above indicated complementing has occurred.

2. Description Relative to the Prior Art A chemical batch frequently requires that the individual chemicals thereof be added together in accordance with a par ticular time sequence. The addition of large quantities of chemicals into a mixing tank or vessel may be physically difficult for a technician to handle (and, therefore, difficult to time); and wasteful of technician-timewhich can better be spent doing other chores.

The most relevant known prior art may be found in US. Pat. Nos. 3,245,585, 3,319,637, and 3,435,247.

SUMMARY OF THE INVENTION Apparatus according to the invention embodies a dispenser unit which is articulated to a ceiling-supported hoist. Pushbutton controls are provided for selectively hoisting the dispenser unit up to a ceiling-disposed PARK position; for positioning the dispenser unit to a floordisposed LOAD level; and for positioning the dispenser unit away from the hoistbut over a mixing tank-to a DISPENSE position. The dispenser unit embodies a plurality of individual dispensers for respective chemicals; and such chemicals are added to the mixing tank in accordance with a technician-programmed sequence. Initiation of such programmed sequence occurs if the dispenser unit is in its DISPENSE position; and if a certain condition (e.g. temperature) for the mixing tank has occurred.

Efficient use of the invention obtains as follows: The LOAD pushbutton is actuated to bring the dispenser unit, say from its ceiling-disposed PARK position, to its LOAD position. The individual dispensers of the dispenser unit are filled-by the technician-with respective chemicals; and when the mixing operation is to be started, the technician actuates the DISPENSE pushbutton. The dispenser unit is hoisted to its DISPENSE level; and then moved out over the mixing tank. Coincidence of such positioning of the dispenser unit together with a certain condition, say temperature, for the mixing tank or its contents, initiates initiates preselected time sequence programmed by the technician. While the sequenced mixing is taking place, the technician, rather than stand in attendance at the mixing tank, may ready other chemicals for a new batch thereof. Then, if desired, the above LOAD-DISPENSE procedure may be repeated; or the PARK button may be actuated to hoist the dispensing unit, for storage thereof, to its ceiling location.

An object of the invention is to provide improved .apparatus for dispensing chemicals, or the like, into a vessel.

Another object of the invention is to provide apparatus for discharging a chemical, or chemicals, from a dispenser unit, into a vessel, when a certain position for such unit complements a certain condition for such vessel.

Another object of the invention is to provide dispensing apparatus for selectively discharging chemicals into a vessel when a certain condition of the vessel is complemented by a certain position for such apparatus, such chemicals being selectively discharged into such vessel according to a certain programmable time sequence.

Another object of the invention is to provide a dispensing unit which is articulated to a ceiling-supported hoist, and which unit selectively discharges chemicals into a vessel when a certain condition of the vessel is complemented by a certain position for the dispensing unit, such chemicals being selectively programmed into such vessel according to a certain time sequence.

The invention will be described with reference to the figures:

FIG. 1 is a schematic block diagram illustrating dispensing apparatus according to the invention, and

FIG. 2 is a diagram illustrating the electrical and hydraulic details of control circuits for carrying out the invention.

Referring to FIG. I, a dispensing unit 10 has a plurality of bins 12a, l2bwhich serve as individual dispensers for respective chemicals. The individual dispensers discharge their respective contents via respective solenoid-actuable valves 14a, l4b-; and mixing tank 16 is adapted to receive such dispenser contents.

The dispensing unit 10 is articulated to a hoist 18 which is supported from the ceiling of the building housing the dispensing system. A vertically positionable traveller 20 rides on the hoist 18; and supports a hydraulic cylinder 22 for horizontally positioning the dispensing unit 10. The hoist 18 supports a hydraulic cylinder 24 for vertically positioning the traveller 20.

Switches are provided to indicate the position of the articulated dispensing unit 10: A switch 26 indicates whether the dispensing unit 10 is in its PARK (P) position, or not so positioned (F) a switch 28 indicates whether the dispensing unit 10 is in its LOAD (L) position, or not so positioned (D; a switch 30 indicates whether the dispensing unit is adjacent (IN) to its hoist 18, or not so positionedafi) ;and a switch 32 indicates whether the dispensing unit 10 is at its dispensing location (OUT), or not so positioned (OUTLA switch 34 is also provided to indicate whether the dispensing unit 10 is at its dispense (D) level; below such level (BD); or above such level (AD).

The condition, eg temperature, of the mixing tank 16 or its contents is sensed by a suitable pickoff 36; and actuation of the

hydraulic cylinders

22, 24 is by means of a position controller 38. In accordance with the invention, a dispensing unit controller 40-actuable when the DISPENSE position of the dispensing unit 10 is complemented, at the input to an AND device 39, by a certain condition for the mixing tank 10- sequences the actuation of the valves 14a, 14b.

Referring to FIG. 2, representative dispense and

position controllers

38, 40 for practicing the invention are indicated. To facilitate an understanding of such controllers, the description is directed to their respective modes of operation. Assuming the dispensing unit is unloaded, and in its PARK position: the technician actuates a normally open LOAD pushbutton switch 42, thereby applying power to a solenoid 44 via the switches 30 (IN) and 28 (II), and via a normally closed pushbutton switch 46'. The solenoid 44 opens valves, 50 respectively causing pressure fluid to be applied to and exhausted from the hydraulic cylinder 24. Thus the traveller 20 and the dispense unit 10 move 48, 50 down to the LOAD level; and when such level is reached, power is removed from the solenoid 44 by action of the switch 38 (L), thereby causing the

valves

48, 50 to close.

The technician then fills the respective bins 12a, l2bwith previously prepared chemicals; and he sets the dispense program (as will be described below).

When it is desired to initiate batch mixing, the technician actuates a normally open DISPENSE pushbutton switch 52; and he holds such switch closed until the dispensing unit is in its dispensing position. Holding the DISPENSE switch 52 closed causes power to be applied first to a solenoid 54 via'the switch 32 (OUT), 34 (BD) and 26 1 and via a normally closed pushbutton switch 42'. The solenoid 54 opens

valves

58, 60, respectively applying fluid to and exhausting fluid from the hydraulic cylinder 24. The traveller 20 and dispensing unit thus move to the dispensing level at which time power is switched (switch 34, D) to a solenoid 62. The solenoid 62 opens

valves

64, 66 causing fluid to be applied to and exhausted from the hydraulic cylinder 22, thereby moving the dispensing unit 10 out over the mixing tank 16. When the dispensing unit 10 is so positioned, power is removed from the solenoid 62-causing the

valves

64, 66 to close-by action of the switch 32 (OUT). If, assuming the preselected dispense program has been completed, the technician desired to repeat the load-and-dispense sequence, he would again actuate the LOAD pushbutton switch 42. This causes power to be applied to a solenoid 68 via the switch 30(T N ),thereby opening valves 70, 72 and causing fluid to be respectively applied to and exhausted from the hydraulic cylinder 22. When the dispensing unit 10 is in," the switch 30 actuates to its IN position; causing power to be applied to the solenoid 44 via the

switches

30, 28 and 46, thereby moving the dispensing unit down to its LOAD level. The dispensing operation may then be repeated, as above.

After the programmed dispensing operation is over, the dispense unit 10 may be parked at its ceiling location by actuation of a pushbutton PARK switch 46. Since the dispensing unit 10 is, at this time, away from its hoist 18 the switch 30 is in its (TN) position, causing actuation of the solenoid 68. Once the dispensing unit 10 reaches its in" position, however, power is switched to the solenoid 54 via the switches 30 (IN), 26 and 42', thereby causing the dispensing unit 10 to move up to its PARK position.

As above stated, an important requirement of the invention is the complementing of the dispense" position of the dispensing unit 10 by a set condition for the mixing tank 16. The set condition for the mixing tank occurs when the pickoff (36) signal T is the same as a preset reference signal; and such signals are compared in a comparator 80. The comparator may, for example, be like the circuit shown and described in Massachusetts Institute of Technology Radiation Laboratories, Volume l9, page 343, McGraw Hill Book Company, New York. When the dispensing unit 10 is in its DISPENSE position, a self-holding relay 82 (self-holding contacts not shown) gets energized via the switch 32 (OUT); and assuming the required condition for the mixing tank 16 has been reached, a self-holding relay 84 is actuated by the comparator 80. (Suitable interlocks or the like may be provided for deenergizing the self-

holding relays

82, 84 as required). Thus, when the

relays

82 and 84 are both simultaneously energized, the timed actuation of the dispenser valves 14a, l4bmay commence in accordance with the sequence programmed by the technician.

Programming obtains as follows: The technician sets timing circuits 90a, 90b-for the respective dispensers 12a, 12bwhereby the dispenser valves 14a, l4b-will be opened at their respective selected times. Each timing circuit includes a rheostat 92; and a capacitor 94 which is charged via its respective rheostat. At the instant the relay 84 actuates in response to the above-discussed complementary conditions, the capacitors 94a, 94b-start to charge. The capacitor 94aits cor responding rheostat set for an early time-charges first; and when charged opens a gate circuit 96a. When the gate circuit 96a opens, a flip-flop circuit 980 is SET, thereby energizing a solenoid 100a which opens the first" dispenser valve 140. The

other timing circuits

90b, 90c, 90d similarly cooperate with

respective gate circuits

96b, 96c, 96d; and with respective flip-

flop circuits

98b, 98c, 98d; and with respective solenoids 100b, 100e, l00d-to open

dispenser valves

14b, 14c, 14d at respective later times. A reset pushbutton switch 102 is provided to reset the flip-flop circuits 98a, 98b, thereby to deenergize their

respective solenoid

1000, 100b--. This allows the dispenser bins 12a, l2bto be filled again for a repeat dispense program.

The gate circuits 96a, 96bmay be, or include, lamps thereby to indicate when the respective dispensers discharge.

The invention has been described in detail with particular reference to a preferred embodiment thereof, but it will be understood that variation and modifications can be effected within the spirit and scope of the invention.

I claim:

1. Apparatus for dispensing substances into a vessel comprising:

a. dispensing means,

b. means, for positioning said dispensing means from at least one nondispensing position to a dispensing position,

c. means for registering when said dispensing means is in its dispensing position,

d. means responsive to a given vessel condition, and

e. logical AND circuit means cooperative with said registration means and said responsive means for actuating said dispensing means when said dispensing means is in its dispensing position and when said vessel has said given condition.

2. The apparatus of claim 1 wherein said means responsive to a vessel condition is temperature responsive means.

3. The apparatus of claim I a. wherein said dispensing means comprises a plurality of individual dispensers,

b. wherein said apparatus includes respective means for discharging the contents of the said individual dispensers, and

c. wherein said apparatus further includes respective circuit means for actuating said respective discharging means in accordance with a predetermined sequence, each said actuating circuit means comprising:

1. a manually adjustable RC circuit,

3. means for setting sad flip-flop circuit in response to a predetermined potential across the capacitor of said RC circuit, and

4. a solenoid actuator cooperative with a respective dispenser discharging means and responsive to the setting of said flip-flop circuit.

4. The apparatus of claim 3 wherein said means responsive to a vessel condition is temperature responsive means.

5. The apparatus of claim 3 wherein said means for positioning said dispensing means is adapted to position said dispensing means selectively to positions above and below the input to said vessel, but to one side of said vessel; and wherein said means for positioning said dispensing means is further adapted to position said dispensing means directly over the input to said vessel.

6. Articulated apparatus for dispensing chemicals or the like into a vessel comprising:

a. a ceiling supported hoist disposed to one side of said vessel,

b. a traveller supported by and vertically positionable on said hoist,

c. first positioning means for vertically positioning said traveller on and along said hoist,

a dispensing unit coupled to said traveller,

second positioning means for horizontally positioning said dispensing unit away from said hoist and over said vessel, control means cooperative with said first and second positioning means for selectively positioning said dispensing unit vertically between park and load locations, and for positioning said dispensing unit horizontally to a dispense location, and

g. logic AND circuit means for discharging said dispensing unit in response to a complementary predetermined con dition for said vessel and a dispense location for said dispensing unit.

7. The apparatus of claim 6 wherein said dispensing unit includes respective dispenser bins for respective chemicals, or the like, and wherein said apparatus includes programming means for timing the discharge of such bins, said programming means comprising respective discharging means for controlling the discharge of said bins, each said discharging means comprising:

a. a manually adjustable RC circuit,

d. a solenoid actuator cooperative with a respective bin to discharge said bin, said solenoid actuator being responsive to the setting of said flip-flop circuit.

Claims

1. Apparatus for dispensing substances into a vessel comprising: a. dispensing means, b. means, for positioning said dispensing means from at least one nondispensing position to a dispensing position, c. means for registering when said dispensing means is in its dispensing position, d. means responsive to a given vessel condition, and e. logical AND circuit means cooperative with said registration means and said responsive means for actuating said dispensing means when said dispensing means is in its dispensing position and when said vessel has said given condition.

2. a flip-flop circuit,

3. The apparatus of claim 1 a. wherein said dispensing means comprises a plurality of individual dispensers, b. wherein said apparatus includes respective means for discharging the contents of the said individual dispensers, and c. wherein said apparatus further includes respective circuit means for actuating said respective discharging means in accordance with a predetermined sequence, each said actuating circuit means comprising:

6. Articulated apparatus for dispensing chemicals or the like into a vessel comprising: a. a ceiling supported hoist disposed to one side of said vessel, b. a traveller supported by and vertically positionable on said hoist, c. first positioning means for vertically positioning said traveller on and along said hoist, d. a dispensing unit coupled to said traveller, e. second positioning means for horizontally positioning said dispensing unit away from said hoist and over said vessel, f. control means cooperative with said first and second positioning means for selectively positioning said dispensing unit vertically between park and load locations, and for positioning said dispensing unit horizontally to a dispense location, and g. logic AND circuit means for discharging said dispensing unit in response to a complementary predetermined condition for said vessel and a dispense location for said dispensing unit.

7. The apparatus of claim 6 wherein said dispensing unit includes respective dispenser bins for respective chemicals, or the like, and wherein said apparatus includes programming means for timing the discharge of such bins, said programming means comprising respective discharging means for controlling the discharge of said bins, each said discharging means comprising: a. a manually adjustable RC circuit, b. a flip-flop circuit, c. means for setting said flip-flop circuit in response to a predetermined potential across the capacitor of said RC circuit, and d. a solenoid actuator cooperative with a respective bin to discharge said bin, said solenoid actuator being responsive to the setting of said flip-flop circuit.