# US 5,706,932 A · Apparatus and method of cleaning conveyor belts > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,932 A - Document ID: US5706932A - Status: Granted - Kind: A - Application number: 08/622,819 - Filed: 1996-03-27 - Granted: 1998-01-13 - Earliest claimed: 1996-03-27 - Inventors: Robert G. White - Web page: https://patentgrep.com/patent/US5706932A ## CPC - B65G 45/22: comprising fluid applying means - B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D) ## Abstract A device for cleaning a conveyor belt, whereby the conveyor belt has at least one surface and the device is responsive to a source of cleaning fluid and a source of pressurized air and is electrically powered by a source of electric power, includes a washer head assembly. The washer head assembly is removably mounted above the conveyor belt and includes a dual spray arm member for spraying the cleaning fluid onto the at least one surface of the conveyor belt. The washer head assembly also includes an air-driven motor for rotating the dual spray arm member, whereby the air-driven motor is responsive to the source of pressurized air and is operatively coupled to the dual spray arm member. Further, the washer head assembly includes a selectively adjustable air flow control valve for adjusting the rotational speed of the dual spray arm member. The conveyor belt cleaning device also includes cart-based equipment which is transported on a portable cart. The cart-based equipment includes an electric motor and a pressure pump for pressurizing the cleaning fluid prior to the cleaning fluid being supplied to the dual spray arm member of the washer head assembly. The cart-based equipment also includes a regulator assembly for controlling the pressurized air prior to the pressurized air being supplied to the air-driven motor of the washer head assembly. The washer head assembly and the cart-based equipment are interconnected by flexible hoses. ## Claims ### Claim 1 Apparatus for cleaning a conveyor belt, the conveyor belt having at least one surface, the apparatus being responsive to a source of cleaning fluid and a source of pressurized air and the apparatus being electrically powered by a source of electric power, the apparatus comprising: a washer head assembly, the washer head assembly being removably mountable above the conveyor belt, the washer head assembly including means for spraying the cleaning fluid onto the at least one surface of the conveyor belt, the spraying means being responsive to the source of cleaning fluid, the washer head assembly also including means for rotating the spraying means, the rotating means being operatively coupled to the spraying means, the rotating means being responsive to the source of pressurized air and further including means for selectively adjusting the speed of rotation of the spraying means; cart-based equipment, the cart-based equipment including: means for pressurizing the cleaning fluid prior to the cleaning fluid being supplied to the spraying means of the washer head assembly, the pressurizing means being releasably coupled to the source of the cleaning fluid; means for controlling the pressurized air prior to the pressurized air being supplied to the rotating means of the washer head assembly, the controlling means being releasably coupled to the source of the pressurized air; first coupling means, the first coupling means releasably coupling the pressurizing means of the cart-based equipment and the spraying means of the washer head assembly; and second coupling means, the second coupling means releasably coupling the controlling means of the cart-based equipment and the rotating means of the washer head assembly; and a cart, the cart portably supporting the cart-based equipment; wherein the washer head assembly is removably mounted above the conveyor belt in order to provide the pressurized cleaning fluid to the conveyor belt. ### Claim 2 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the rotating means of the washer head assembly comprises: an air-driven motor, the air-driven motor being operatively coupled to the second coupling means of the cart-based equipment, the air-driven motor being driven by the source of pressurized air passing through each of the controlling means and the second coupling means of the cart-based equipment, the air-driven motor providing a rotational driving force; and means for translating the rotational driving force of the air-driven motor to the spraying means, the translating means being connected between the air-driven motor and the spraying means. ### Claim 3 (depends on 2) Apparatus for cleaning a conveyor belt as defined in claim 2, wherein the translating means includes a first sprocket, a second sprocket and a chain, the first sprocket being connected to the air-driven motor, the second sprocket being connected to the spraying means, the chain being coupled between the first and second sprockets, whereby the rotational driving force of the air-driven motor causes the first sprocket to rotate, in turn rotating the chain, in turn rotating the second sprocket, and in turn causing the spraying means to correspondingly rotate. ### Claim 4 (depends on 3) Apparatus for cleaning a conveyor belt as defined in claim 3, wherein the translating means further includes a chain tensioner, the chain tensioner engaging the chain thereby maintaining a tension in the chain as the chain rotates around the first and second sprockets. ### Claim 5 (depends on 2) Apparatus for cleaning a conveyor belt as defined in claim 2, wherein the rotating means further includes: an intermediate coupler, the intermediate coupler having a first port and a second port, the intermediate coupler being fixedly mounted on the washer head assembly; and an intermediate hose, the intermediate hose having a first end and a second end, the first end being releasably coupled to the air-driven motor and the second end being releasably coupled to the first port of the intermediate coupler; whereby the second coupling means is releasably coupled to the second port of the intermediate coupler in order to substantially reduce coupling stress on the air-driven motor. ### Claim 6 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the adjusting means of the rotating means includes a selectively adjustable speed control device, the speed control device being mounted on the rotating means, the speed control device controlling a rotational speed associated with the spraying means. ### Claim 7 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the washer head assembly further includes means for automatically disconnecting the electric power to the apparatus, the washer head assembly automatic power disconnect means being operatively connected to the source of the electric power, the washer head assembly automatic power disconnect means being mounted on the washer head assembly and being responsive to the washer head assembly being situated in one of a level position and an unlevel position. ### Claim 8 (depends on 7) Apparatus for cleaning a conveyor belt as defined in claim 7, wherein the washer head assembly automatic power disconnect means includes a mercury tilt-level sensor. ### Claim 9 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the spraying means comprises: a cleaning fluid union, the union being operatively coupled to the first coupling means of the cart-based equipment, the union allowing the pressurized cleaning fluid to pass therethrough; and at least one spray arm member, the at least one spray arm member being coupled to the cleaning fluid union, the at least one spray arm member also having at least one nozzle attached thereto, the at least one nozzle discharging the pressurized cleaning fluid, provided through the cleaning fluid union and through the at least one spray arm member to the at least one nozzle, in the direction of the at least one surface of the conveyor belt. ### Claim 10 (depends on 9) Apparatus for cleaning a conveyor belt as defined in claim 9, wherein the at least one nozzle is adjustably mounted on the at least one spray arm member thereby providing a varying spray angle. ### Claim 11 (depends on 9) Apparatus for cleaning a conveyor belt as defined in claim 9, wherein the at least one nozzle is fixedly mounted on the at least one spray arm member and has a fixed spray angle range of between approximately fifteen degrees and approximately twenty degrees. ### Claim 12 (depends on 9) Apparatus for cleaning a conveyor belt as defined in claim 9, wherein the spraying means further includes: an intermediate coupler, the intermediate coupler having a first port and a second port, the intermediate coupler being fixedly mounted on the washer head assembly; and an intermediate hose, the intermediate hose having a first end and a second end, the first end being releasably coupled to the cleaning fluid union and the second end being releasably coupled to the first port of the intermediate coupler; whereby the first coupling means is releasably coupled to the second port of the intermediate coupler in order to substantially reduce coupling stress on the cleaning fluid union. ### Claim 13 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the cart-based equipment further includes a control panel assembly, the control panel assembly controlling the operation of the apparatus. ### Claim 14 (depends on 13) Apparatus for cleaning a conveyor belt as defined in claim 13, wherein the control panel assembly includes means for selectively applying the electric power to the apparatus, the power applying means being operatively connected to the source of the electric power. ### Claim 15 (depends on 14) Apparatus for cleaning a conveyor belt as defined in claim 14, wherein the power applying means includes at least one disconnect switch. ### Claim 16 (depends on 13) Apparatus for cleaning a conveyor belt as defined in claim 13, wherein the control panel assembly further includes means for selectively starting the cleaning operation of the apparatus, the selective starting means being operatively connected to the source of the electric power. ### Claim 17 (depends on 16) Apparatus for cleaning a conveyor belt as defined in claim 16, wherein the selective starting means includes a pushbutton switch. ### Claim 18 (depends on 13) Apparatus for cleaning a conveyor belt as defined in claim 13, wherein the control panel assembly further includes means for selectively stopping the cleaning operation of the apparatus, the selective stopping means being operatively connected to the source of the electric power. ### Claim 19 (depends on 18) Apparatus for cleaning a conveyor belt as defined in claim 18, wherein the selective stopping means includes a pushbutton switch. ### Claim 20 (depends on 13) Apparatus for cleaning a conveyor belt as defined in claim 13, wherein the control panel assembly further includes an indicator, the indicator providing an indication that the electric power is applied to the apparatus and that the apparatus is currently operating, the indicator being operatively connected to the source of the electric power. ### Claim 21 (depends on 20) Apparatus for cleaning a conveyor belt as defined in claim 20, wherein the indicator is a lamp, the lamp being lit when the electric power is applied to the apparatus and the apparatus is currently operating. ### Claim 22 (depends on 13) Apparatus for cleaning a conveyor belt as defined in claim 13, wherein the control panel assembly further includes means for selectively setting a maximum operation time, the maximum operation time corresponding to the operation of the apparatus, the maximum operation time setting means being operatively connected to the source of the electric power. ### Claim 23 (depends on 22) Apparatus for cleaning a conveyor belt as defined in claim 22, wherein the maximum operation time setting means includes an adjustable operation timer, whereby the adjustable operation timer automatically disconnects the electric power to the apparatus when the maximum operation time has been reached. ### Claim 24 (depends on 13) Apparatus for cleaning a conveyor belt as defined in claim 13, wherein the control panel assembly further includes means for automatically disconnecting the electric power to the apparatus, the control panel assembly automatic power disconnect means being responsive to a predefined current leakage level to ground, the control panel assembly automatic power disconnect means being operatively connected to the source of the electric power. ### Claim 25 (depends on 24) Apparatus for cleaning a conveyor belt as defined in claim 24, wherein the control panel assembly automatic power disconnect means includes at least one ground fault detector. ### Claim 26 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein means for pressurizing the cleaning fluid prior to the cleaning fluid being supplied to the spraying means comprises: an electric motor, the electric motor being operatively connected to the source of electric power; and a pressure pump, the pressure pump being operatively coupled to, and driven by, the electric motor, the pressure pump having at least a first input port and at least a first output port, the at least a first input port being releasably coupled to the source of cleaning fluid, the at least a first output port being releasably coupled to the first coupling means of the cart-based equipment, the pressure pump pressurizing the cleaning fluid, as the cleaning fluid passes therethrough, prior to the cleaning fluid being supplied to the spraying means of the washer head assembly. ### Claim 27 (depends on 26) Apparatus for cleaning a conveyor belt as defined in claim 26, wherein the pressure pump pressurizes the cleaning fluid in order to develop an output pressure of approximately 1500 pounds per square inch. ### Claim 28 (depends on 26) Apparatus for cleaning a conveyor belt as defined in claim 26, wherein the pressure pump further includes an output pressure control valve, the output pressure control valve being mounted on the pressure pump and providing for selective adjustment of an output pressure associated with the cleaning fluid supplied to the spraying means. ### Claim 29 (depends on 26) Apparatus for cleaning a conveyor belt as defined in claim 26, wherein the pressure pump includes a high pressure bypass port, whereby the cleaning fluid, subsequent to being pressurized, is discharged from the pressure pump through the high pressure bypass port when the apparatus experiences at least one of a first plurality of malfunction conditions. ### Claim 30 (depends on 26) Apparatus for cleaning a conveyor belt as defined in claim 26, wherein the pressure pump includes a low pressure bypass port, whereby the cleaning fluid, prior to being pressurized, is discharged from the pressure pump through the low pressure bypass port when the apparatus experiences at least one of a second plurality of malfunction conditions. ### Claim 31 (depends on 26) Apparatus for cleaning a conveyor belt as defined in claim 26, wherein the pressure pump includes a filter, the filter being coupled to the at least first input port, the filter preventing foreign particles, present in the cleaning fluid supplied by the source, from entering the pump. ### Claim 32 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the means for controlling the rotating means includes a regulator assembly, the regulator assembly having at least one input port and at least one output port, the at least one input port being releasably coupled to the source of pressurized air, the at least one output port being releasably coupled to the second coupling means of the cart-based equipment, the regulator assembly being responsive to the source of electric power, the regulator assembly being in one of an operating state and a non-operating state, the operating state and the non-operating state occurring in respective response to the presence and absence of electric power at the regulator assembly, the regulator assembly allowing pressurized air to pass therethrough while in the operating state and preventing pressurized air from passing therethrough while in the non-operating state. ### Claim 33 (depends on 32) Apparatus for cleaning a conveyor belt as defined in claim 32, wherein the regulator assembly further includes a filter, the filter preventing foreign particles, present in the pressurized air supplied by the source, from passing through the regulator assembly to the rotating means of the washer head assembly. ### Claim 34 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the first coupling means of the cart-based equipment includes a flexible hose, the flexible hose having a first end and a second end and connectors, fitted at each end, for releasably coupling the flexible hose between the pressurizing means and the spraying means. ### Claim 35 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the second coupling means of the cart-based equipment includes a flexible hose, the flexible hose having a first end and a second end and connectors, fitted at each end, for releasably coupling the flexible hose between the controlling means and the rotating means. ### Claim 36 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the cart includes means for storing the first connecting means when the apparatus is not in use. ### Claim 37 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the cart includes means for storing the second connecting means when the apparatus is not in use. ### Claim 38 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the cart includes means for storing the washer head assembly when the apparatus is not in use. ### Claim 39 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the washer head assembly further includes a protective cowl, the cowl having a top wall, a continuous side wall and a bottom opening, the continuous side wall having an upper edge and a lower edge, the upper edge being attached to the top wall, the lower edge defining the bottom opening of the cowl, the cowl allowing cleaning fluid to be sprayed out of the bottom opening of the cowl by the spraying means but preventing the cleaning fluid sprayed by the spraying means from being directed in a direction other than towards the at least one surface of the conveyor belt. ### Claim 40 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the washer head assembly further includes a pair of mounting brackets, the pair of mounting brackets being fixedly attached to the washer head assembly, the pair of mounting brackets engaging the conveyor belt such that the washer head assembly may be removably mounted thereabove while allowing the conveyor belt to move beneath the washer head assembly. ### Claim 41 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the cleaning fluid is water. ### Claim 42 (depends on 1) Apparatus for cleaning a conveyor belt as defined in claim 1, wherein the means for pressurizing the cleaning fluid further includes means for automatically disconnecting the electric power to the apparatus, the automatic power disconnect means being operatively connected to the source of electric power and mounted between the source of cleaning fluid and the pressurizing means, the automatic power disconnect means being responsive to the presence of cleaning fluid supplied by the source of cleaning fluid. ### Claim 43 (depends on 42) Apparatus for cleaning a conveyor belt as defined in claim 42, wherein the automatic power disconnect means includes a water pressure switch. ### Claim 44 Apparatus for cleaning a conveyor belt, the conveyor belt having at least one surface, the apparatus being responsive to a source of cleaning fluid and a source of pressurized air and the apparatus being electrically powered by a source of electric power, the apparatus comprising: a washer head assembly, the washer head assembly being removably mountable above the conveyor belt, the washer head assembly including: a cleaning fluid union; a dual spray arm member, the dual spray arm member being coupled to the cleaning fluid union, the dual spray arm member having two spray arms, each spray arm extending radially outward from the coupling with the cleaning fluid union, each spray arm having an outer end with a nozzle attached thereto, the nozzle of each spray arm pointing in a direction substantially toward the at least one surface of the conveyor belt, the dual spray arm member further having a first sprocket attached thereto; an air-driven motor, the air-driven motor being responsive to the source of pressurized air and providing a rotational driving force, the air-driven motor further having a second sprocket attached thereto; a selectively adjustable air flow control valve for controlling the rotational driving force of the air-driven motor, the air flow control valve being operatively coupled between the source of pressurized air and the air-driven motor; a chain, the chain engaging the first sprocket of the dual spray arm member and the second sprocket of the air-driven motor, whereby the rotational driving force of the air-driven motor causes the second sprocket to rotate, in turn rotating the chain, in turn rotating the first sprocket, in turn causing the dual spray arm member to correspondingly rotate; and a tilt-level sensor, the tilt-level sensor being operatively connected to the source of electric power, the tilt-level sensor being responsive to the washer head assembly being in one of a level position and an unlevel position, the tilt-level sensor automatically disconnecting the source of electric power to the apparatus when the washer head assembly is in the unlevel position; cart-based equipment, the cart-based equipment including: a control panel assembly, the control panel assembly being releasably connected to the source of electric power, the control panel assembly controlling the operation of the apparatus and including: a disconnect switch, the disconnect switch being electrically connected to the source of electric power, the disconnect switch selectively applying electric power to the apparatus; a start pushbutton switch, the start pushbutton being operatively connected to the disconnect switch, the start pushbutton switch selectively starting the cleaning operation of the apparatus, the start pushbutton switch also including a lamp, the lamp being lit when electric power is applied to the apparatus and the apparatus is currently operating; a stop pushbutton switch, the stop pushbutton being operatively connected to the disconnect switch, the stop pushbutton switch selectively stopping the cleaning operation of the apparatus; and a selectively adjustable operation timer, the operation timer being operatively connected to the disconnect switch, the operation timer allowing a maximum operation time, corresponding to the operation of the apparatus, to be set, the operation timer automatically disconnecting electric power to the apparatus when the maximum operation time has been reached; a set of diagnostic indicator lights, the lights being mounted on the control panel assembly and providing an operation status of the apparatus; the cart-based equipment further including: an electric motor, the electric motor being operatively connected to the control panel assembly and being responsive to the electric power provided therefrom; a pressure pump, the pump being operatively coupled to, and driven by, the electric motor, the pressure pump having at least a first input port and at least a first output port, the at least a first input port being releasably coupled to the source of cleaning fluid, the pump pressurizing the cleaning fluid, as the cleaning fluid passes therethrough, the pressure pump also including a pressure switch, the pressure switch being operatively coupled to the at least a first input port and automatically disconnecting the source of electric power to the apparatus when the pressure switch detects the absence of cleaning fluid being supplied by the source; a regulator assembly, the regulator assembly having at least one input port and at least one output port, the at least one input port being releasably coupled to the source of pressurized air, the regulator assembly being responsive to the source of electric power, the regulator assembly being in one of an operating state and a non-operating state, the operating state and the non-operating state occurring in respective response to the presence and absence of electric power at the regulator assembly, the regulator assembly allowing pressurized air to pass therethrough while in the operating state and preventing pressurized air from passing therethrough while in the non-operating state; a first flexible hose for carrying the pressurized cleaning fluid, the first flexible hose having a first end and a second end and connectors, fitted at each end, the connector fitted at the first end being releasably coupled to the at least first output port of the pressure pump of the cart-based equipment, the connector fitted at the second end being releasably coupled to the cleaning fluid union of the washer head assembly; a second flexible hose for carrying the pressurized air, the second flexible hose having a first end and a second end and connectors, fitted at each end, the connector fitted at the first end being releasably coupled to the at least one output port of the regulator assembly of the cart-based equipment, the connector fitted at the second end being releasably coupled to the air-driven motor of the washer head assembly; and an electric cable, the electric cable having a first end and a second end, the first end being releasably connected to the control panel assembly of the cart-based equipment and the second end being releasably connected to the tilt-level sensor of the washer head assembly; and a cart, the cart portably supporting the cart-based equipment; wherein the washer head assembly is removably mounted above the conveyor belt, electric power is applied to the apparatus via the disconnect switch and the apparatus is placed in an operating condition via the start pushbutton switch thereby allowing the pressure pump to provide pressurized cleaning fluid to the dual spray arm member of the washer head assembly and placing the regulator assembly in an operating state allowing pressurized air to pass therethrough to the air-driven motor of the washer head assembly, the air-driven motor causing the dual spray arm member to rotate, the nozzles of the dual spray arm member delivering the pressurized cleaning fluid to the at least one surface of the conveyor belt, and the selectively adjustable air flow control valve being selectively adjusted in order to control the rotational driving force of the air-driven motor thereby adjusting the rotational speed of the dual spray arm member. ### Claim 45 A method of cleaning a conveyor belt, the conveyor belt having at least one surface, the method utilizing a conveyor belt cleaning apparatus, the apparatus being responsive to a source of cleaning fluid and a source of pressurized air and the apparatus being electrically powered by a source of electric power, the apparatus including a washer head assembly, cart-based equipment and a cart, the washer head assembly including means for spraying the cleaning fluid onto the at least one surface of the conveyor belt, the washer head assembly also including means for rotating the spraying means, the cart-based equipment including means for pressurizing the cleaning fluid prior to the cleaning fluid being supplied to the spraying means, the cart portably transporting the cart-based equipment and the washer head assembly being removably mounted above the conveyor belt, the method comprising: supplying cleaning fluid to the pressurizing means of the cart-based equipment; pressurizing the cleaning fluid via the pressurizing means of the cart-based equipment; supplying the pressurized cleaning fluid to the spraying means of the washer head assembly; supplying pressurized air to the rotating means of the washer head assembly in order to generate a rotational driving force; translating the rotational driving force of the rotating means to the spraying means of the washer head assembly thereby causing the spraying means to correspondingly rotate; spraying the pressurized cleaning fluid onto the at least one surface of the conveyor belt as the conveyor belt moves therebeneath; and adjusting the rotational speed of the spraying means. ### Claim 46 (depends on 45) A method of cleaning a conveyor belt as defined in claim 45, further comprising the step of: automatically disconnecting the electric power to the conveyor belt cleaning apparatus if the washer head assembly, mounted above the conveyor belt, becomes unlevel.