Control apparatus for an automatic pipe welder
First Claim
1. A control apparatus for controlling an automatic pipe welder which effects continuous welding along a welding line on a periphery of a pipe, in accordance with predetermined welding conditions previously set to each of a plurality of welding areas sectioned along said welding line, said control apparatus comprising:
- a plurality of control units provided respectively for said welding conditions and receiving respective control commands representative of the welding conditions to control the operation of said welder in accordance with the received control commands;
a first digital storage device for storing the welding conditions relating to one of said welding areas at which said welder is present;
a position sensing device for producing a position signal corresponding to the position of said welder;
a second digital storage device for storing all of the welding conditions for said welding areas and for changing the welding conditions stored in said first digital storage device when the second digital storage device receives the position signal indicative of the position of the welder at which the welding conditions are to be changed;
at least one digital-analog converter for converting digital signals produced from said first digital storage device indicative of said welding conditions stored in said first digital storage device, into analog signals; and
a plurality of sample and hold circuits provided respectively for said welding conditions for holding respective analog signals for a predetermined time period and delivering said analog signals as said contol commands.
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Accused Products
Abstract
Disclosed is a control apparatus for an automatic pipe welder, for controlling the automatic pipe welder which continuously butt welds pipes while it is running along a welding line on the periphery of a pipe, in accordance with predetermined welding conditions for each of a plurality of welding areas sectioned along the welding line. All of the welding conditions for the welding areas are stored in a digital storage device while welding conditions on an area currently being welded are stored in another storage device. The contents of the second-mentioned digital storage device are converted by a digital-analog converter to analog signals, which are then held respectively in corresponding sample and hold circuits. Outputs of the sample and hold circuits are supplied as control commands to respective control units which control the welder in accordance with the welding conditions. In this manner, the construction of the control apparatus and a control panel thereof is simplified.
43 Citations
8 Claims
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1. A control apparatus for controlling an automatic pipe welder which effects continuous welding along a welding line on a periphery of a pipe, in accordance with predetermined welding conditions previously set to each of a plurality of welding areas sectioned along said welding line, said control apparatus comprising:
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a plurality of control units provided respectively for said welding conditions and receiving respective control commands representative of the welding conditions to control the operation of said welder in accordance with the received control commands; a first digital storage device for storing the welding conditions relating to one of said welding areas at which said welder is present; a position sensing device for producing a position signal corresponding to the position of said welder; a second digital storage device for storing all of the welding conditions for said welding areas and for changing the welding conditions stored in said first digital storage device when the second digital storage device receives the position signal indicative of the position of the welder at which the welding conditions are to be changed; at least one digital-analog converter for converting digital signals produced from said first digital storage device indicative of said welding conditions stored in said first digital storage device, into analog signals; and a plurality of sample and hold circuits provided respectively for said welding conditions for holding respective analog signals for a predetermined time period and delivering said analog signals as said contol commands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification