초록 ▼

A repetitive combustion coating apparatus for applying coatings of particulate materials such as powdered tungsten carbide and other metal alloys by discharging discrete quantities of material encapsulated in an elongated tape into a combustion chamber and igniting a fuel-air mixture therein to deli

A repetitive combustion coating apparatus for applying coatings of particulate materials such as powdered tungsten carbide and other metal alloys by discharging discrete quantities of material encapsulated in an elongated tape into a combustion chamber and igniting a fuel-air mixture therein to deliver the charge of combustion gases and entrained particulate material through a nozzle to impact the article to be coated. The apparatus includes a rotary indexing wheel over which the encapsulated tape is trained with the spaced apart capsules nested in circumferentially spaced supporting receptacles. The indexing wheel is mounted on support arms which permit limited linear reciprocation so that a ratchet mechanism incrementally indexes the wheel and permits linear movement of the wheel to successively clamp the tape capsules against a clamping die. High pressure gas is introduced through a support spindle for the indexing wheel and internal passages in the wheel to burst a capsule and deliver a charge of particulate material into a combustion chamber. The indexing of the wheel is controlled by a detent mechanism to compensate for dimensional variations in the various structural parts of the apparatus. A control system provides a timed sequence of events to deliver a charge of fuel-air mixture to the combustion chamber as well as a charge of particulate material and ignition of the mixture.

대표청구항 ▼

A method for operating a repetitive combustion coating apparatus for delivering discrete quantities of particulate material entrained in a stream of combustion gases to a work piece, said apparatus comprising means forming a combustion chamber, means for introducing a fuel-air mixture into said comb

A method for operating a repetitive combustion coating apparatus for delivering discrete quantities of particulate material entrained in a stream of combustion gases to a work piece, said apparatus comprising means forming a combustion chamber, means for introducing a fuel-air mixture into said combustion chamber including a first valve operable to be opened to admit said mixture to said combustion chamber, means for successively positioning a plurality of spaced apart capsules formed on an encapsulating tape, said capsules each including premeasured quantities of particulate material, actuating means for said positioning means, a second valve for controlling the delivery of high pressure gas to said positioning means to burst a capsule to inject the particulate material encapsulated by said tape into said combustion chamber, ignition means for ingniting said mixture, and control means for providing control signals to operate said first and second valves, said actuating means and said ignition means: said method including the steps of: actuating said positioning means to position one of said capsules for injection of a quantity of particulate material into said combustion chamber; producing signals with said control means to sequentially open said first valve to admit a flow of said mixture to said combustion chamber when said capsule is positioned for stripping and substantially simultaneously close said first valve and open said second valve to admit pressure gas to burst said capsule in position to be stripped, and igniting said mixture in said combustion chamber after commencement of the admission of pressure gas to burst said capsule while continuing to admit pressure gas to strip said material from said capsule; ceasing the admittance of pressure gas after a predetermined time period; and actuating said positioning means to place another capsule in position for stripping said particulate material.