System for the monitoring and control of flow of particulate material in impact treatment equipment
First Claim
1. In an apparatus including a nozzle, a compressed gas supply line, a source of particulate material, duct means having an inlet connected to said supply line and having an outlet connected to said nozzle, said supply line, said duct means and said nozzle defining a gas stream path for providing a stream of gas, and metering means connected to said duct means and particulate material source for feeding said particulate material into said gas stream for entraining said material in said gas stream, a path between said metering means and said nozzle defining a particulate material path, the improvement therein comprising;
- first monitoring means connected to said gas stream path for monitoring the flow density of the particulate material,second monitoring means connected to said gas stream path for monitoring the flow velocity of said material, andcontrol means comprising a first control loop connected to said flow density monitoring means and first flow control means connected to said first control loop to correct automatically the flow density on detection of a predetermined deviation of the monitored flow density from a first preset value, and a second control loop connected to said flow velocity monitoring means and second flow control means connected to said second control loop to correct automatically the flow velocity on detection of a predetermined deviation of the monitored flow velocity from a second preset value.
1 Assignment
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Accused Products
Abstract
Air blast peening equipment includes a flow density transducer and a pressure or velocity transducer for measuring flow velocity. Measured values are compared during peening with predetermined desired values. Operation of the apparatus is automatically adjusted, if necessary, by adjustment of flow density and/or flow velocity to maintain these parameters at desired values.
29 Citations
9 Claims
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1. In an apparatus including a nozzle, a compressed gas supply line, a source of particulate material, duct means having an inlet connected to said supply line and having an outlet connected to said nozzle, said supply line, said duct means and said nozzle defining a gas stream path for providing a stream of gas, and metering means connected to said duct means and particulate material source for feeding said particulate material into said gas stream for entraining said material in said gas stream, a path between said metering means and said nozzle defining a particulate material path, the improvement therein comprising;
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first monitoring means connected to said gas stream path for monitoring the flow density of the particulate material, second monitoring means connected to said gas stream path for monitoring the flow velocity of said material, and control means comprising a first control loop connected to said flow density monitoring means and first flow control means connected to said first control loop to correct automatically the flow density on detection of a predetermined deviation of the monitored flow density from a first preset value, and a second control loop connected to said flow velocity monitoring means and second flow control means connected to said second control loop to correct automatically the flow velocity on detection of a predetermined deviation of the monitored flow velocity from a second preset value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of impact peening a work piece, comprising the steps of;
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conveying particulate peening material in a gas stream to a nozzle through which it is accelerated onto the work piece, monitoring the material flow density, monitoring the flow velocity, comparing the monitored flow density during peening with a first predetermined value, comparing the monitored flow velocity during peening with a second predetermined value, and separately controlling the flow density and flow velocity during peening to maintain their respective values within respective predetermined ranges. - View Dependent Claims (9)
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Specification