Pivoting device with arm and control rod

Details Pivoting device with arm and control rod Pivoting device with arm and control rod

2000-01-06

2001-06-26

Kastler, Scott (Department: 1742)

Metallurgical apparatus

Means sealing or opening aperture in vessel

C414S680000

Reexamination Certificate

active

06251338

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to a swivelling device with a cantilever arm to swing a working implement between a first and a second position and with a control rod to align the implement as a function of the angular position of the cantilever arm. Such a device is used, for example, in a tap-hole drilling machine or tap-hole plugging machine on a blast furnace.
BACKGROUND OF THE INVENTION
A “classic” tap-hole drilling machine has a supporting structure in which a cantilever arm is swivellably mounted with a first end about a first axis. A swivel drive produces a swivelling motion of the cantilever arm about this first axis, e.g. from a rest position to a first working position in front of a first tap-hole, or to a second working position in front of a second tap-hole, and back to the rest position in each case. A drill mounting is connected to the second end of the cantilever arm and can swivel about a second axis. A control rod is connected via a first linkage to a fixed point on the supporting structure and via a second linkage to the swivellable drill mounting, so that a swivelling motion of the cantilever arm about the first axis produces a swivelling motion of the drill mounting about the second axis. The alignment of the drill mounting can consequently be determined by the control rod, as a function of the angular position of the cantilever arm.
The drawback with such swivelling devices is that the control rod crosses the cantilever arm when swivelling the drill mounting. Consequently, this control rod has to be arranged either above or below the cantilever arm, which of course increases the space required to swivel the cantilever arm (i.e. the headroom required). This can lead to space problems, particularly when a tap-hole drilling machine and a tap-hole plugging machine are arranged on the same side of the tapping runner and the cantilever arm of the tap-hole drilling machine has to pass under or over the tap-hole plugging gun when swivelling. Such a configuration is described in U.S. Pat. No. 4,195,825, for example.
The task of the present invention is to create a swivelling device with a cantilever arm and control rod which requires less headroom to swivel the cantilever arm.
SUMMARY OF THE INVENTION
This problem is solved by a swivelling device according to the present invention.
A swivelling device according to the invention, for carrying a working implement (e.g. a drill mounting or a plugging gun) comprises, in a known manner, a supporting structure, a cantilever arm and a control rod. A first end of the cantilever arm is swivellably mounted in the supporting structure, so that the cantilever arm can swivel about a first axis relative to the supporting structure. The working implement is swivellably attached to the second end of the cantilever arm, so that it can swivel relative to the cantilever arm about a second axis. The control rod is coupled at its first end to a swivellable working implement. One important feature of the present invention is that the second end of the control rod is not, as is usual, coupled to a fixed point of the supporting structure, but to a four-link mechanism. This four-link mechanism comprises the supporting structure as a frame and the cantilever arm as a driven member. A first connecting link is-coupled to the supporting structure, and a second connecting link is coupled to the cantilever arm. These two connecting links are connected to each other in an articulated manner so that the four-link mechanism is completed. The control rod is coupled with its second end to the first or second connecting link of the linkage. In this swivelling device according to the invention, when the cantilever arm swivels, the point of linkage of the second end of the control rod is always on the same side of the cantilever arm, so that the control rod does not cross the cantilever arm when swivelling. This creates a swivelling device which—at least in the swivelling range of the control rod—requires less headroom for the cantilever arm to swivel.


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