Method and apparatus for controlling bevel wrapping mechanism |
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| 申请号 | US29451672 | 申请日 | 1972-10-30 | 公开(公告)号 | US3820729A | 公开(公告)日 | 1974-06-28 |
| 申请人 | PRICE BROTHERS CO; | 发明人 | MARCUM A; SPRINGER L; MULLENDORE D; | ||||
| 摘要 | Apparatus for electronically monitoring the rotational position of a concrete core as it is rotated about its axis during a prestressing wire wrapping operation and simultaneous monitoring the position of a wire feed carriage moving axially of the pipe to provide signals for controlling the movement of a pantograph type wire guide which oscillates the wire guide with a straight line movement parallel to the axis of the core as the wire feed carriage moves along the bevel end of the core. | ||||||
| 权利要求 | 1. In apparatus for wrapping prestressing wire about a pipe core having a bevel portion adjacent one end thereof including means for rotating a bevel pipe core about its longitudinal axis, a wire control carriage, means for moving said carriage along a path parallel to the longitudinal axis of said pipe at a speed proportional to the rotational speed of said pipe, and a wire guide on said carriage to direct wire onto said pipe, the improvement comprising: a. a wire feed link mounted on said carriage and carrying said wire guide, b. means for oscillating said feed link with said wire guide moving substantially parallel to said core axis, c. means for generating an electrical signal of sinusoidal wave form which is correlated with the rotation of said pipe about its axis, d. means for modifying the amplitude of said sinusoidal signal in accordance with the diameter oF the pipe being wrapped, e. means for generating an electrical signal in accordance with movement of said wire control carriage, f. means for further modifying said sinusoidal wave form signal to reduce its amplitude as the bevel portion of said pipe is wrapped, and g. means responsive to said further modified sinusoidal signal for controlling the oscillation of said wire feed link. 2. The apparatus of claim 1 further including: a. means for adjusting the phase of said sinusoidal wave form signal with respect to the initial position of the bevel pipe core. 3. The apparatus of claim 1 wherein: a. said means for generating electrical signals representing the movement of said wire control carriage includes means for generating a predetermined number of pulses for each increment of movement of said carriage, and b. said means for further modifying said sinusoidal signals includes a digital to analogue converter responsive to said pulses to reduce the amplitude of said sinusoidal signal by specific increments in response to predetermined numbers of said pulses. 4. The apparatus of claim 1 wherein: a. said wire feed link is one link of a pantograph. 5. The apparatus of claim 4 wherein said pantograph comprises: a. a guide link, b. a spacer link, c. means pivotally mounting said guide and spacer links on said carriage for pivotal movement about a pivot point fixed with respect to said carriage, d. a drive link pivotally attached to said spacer link at a point thereon spaced from the pivotal connection of said spacer link to said carriage, e. means pivotally attaching said wire feed link to said guide link at a point thereon spaced from the pivotal connection of said guide link to said carriage, and f. means pivotally attaching said drive link to said feed link at a point intermediate the pivotal attachment of said guide link thereto and said wire guide. 6. The apparatus of claim 5 wherein said oscillating means comprises: a. means engaging said drive link at a point thereon intermediate the points of pivotal attachment thereof to said spacer link and feed link for movement of said point thereon along a path parallel to the axis of rotation of said core. 7. The apparatus of claim 6 wherein said oscillating means comprises: a. a double acting piston and cylinder, and b. a piston rod attached to said piston and projecting from said cylinder, c. said means engaging said drive link at said point thereon also connecting an outer end of said piston rod to said drive link. 8. The apparatus of claim 7 further comprising: a. a servo valve for directing pressurized fluid into said cylinder on opposite sides of said piston, b. means for monitoring the positon of said piston within said cylinder, c. means for comparing the position of said piston in said cylinder to position of said carriage along said core, d. said comparing means controlling said servo valve to direct fluid to the appropriate side of said piston to obtain the desired spacing between said wraps. |
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