| 摘要 |
One end of an elongated element, for example, a soot blower for the cleaning of firebox wall surfaces, is moved along a predetermined, meandrical blow figure. The element is supported in two spaced-apart cardanic joints the first of which is stationary and the second axially moveable on a first spindle. The ends of the first spindle are axially moveable on two parallel second spindles. The first and one of the second spindles are respectively provided with non-mechanical, inductive end switches which are connected with a programmable controller. The end switches determine a reference point in horizontal and vertical direction, and two end switches detect the rotations of the spindles as a measure of the distance travelled by the second cardanic joint. The impulses of the end switches which are proportional to the distance travelled are compared in the controller with the preselected blow figure, and the spindles are controlled according to the blow figure. The process ensures exact compliance with the blow figure independent of the speed of rotation of the spindles and, thus, permits adjustment of the residence time of the blow jet on any selected wall surface without affecting the compliance with the blow figure.
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