DE8018441U1 - KNIFE SHIELD WITH DEFLECTORS ON CYLINDER STOP - Google Patents

Description

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D-P Qui / Bü.

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Westfalia Ironworks Union, 46 70 Lünen

Knife shield with deflectors on the cylinder stop

The invention relates to a knife shield with a tracking device Support frame guided, profiled jacking knives, which by means of presses supported on the support frame individually or are prepressable in groups.

Such knife shields are used for driving tunnels, tunnels, open trenches or other cavities used in the ground (DE-OS 25 55 524, DE-OS 28 49 776). Especially when it comes to use the known knife shields in loose, unstable soils, especially in layers of flowing sand and the like, there is a risk of that bed material, which enters the shield from the outside, collects in the sole area of the knife shield. This penetrated Soil material is solidified by the connecting joints of the feed presses arranged here and, under certain circumstances, so strong briquettes that the sole knife feed presses can block. The same problem occurs with my

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bring up the support frame; This section of work is also severely hindered by accumulated soil material. The jacking jj!

work then has to be interrupted in order to | ·;

si 'the debris that has penetrated and, if necessary, strongly consolidated |

Remove soil material. |

V The object of the invention is to provide effective and simple measures |! that counteract the accumulation, stowage and briquetting of the soil ■ material in the sole area of the knife blade.

This object is achieved in that the on the sole knives arranged connection joints for the feed presses received both front and rear deflector members.

According to the invention, the front ones seen in the propulsion direction are Abweisorgane wedge-shaped. It is advisable to design these deflectors in one piece, e.g. B. as a solid piece of material, Casting, angled sheet metal and the like .. But they can also consist of sheets connected to one another at an angle. the The same design options are also given for the rear ploughshare-like deflector elements.

In the preferred embodiment, the rear deflector elements it has a width that is greater than the width of the connecting joints, and additionally receive deflector plates between the connecting joints and the end edge of the rear deflector elements, which exclude obstacles to the propulsion knife during advance.

With this embodiment of the knife shield, soil material that has penetrated into briquettes is both when the sole knife is advanced as well as when catching up the support frame, and thus a smooth progression of the tunneling work guaranteed.

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An embodiment of the invention is illustrated below with reference to the drawing explained in more detail.

It shows:

Fig. 1 in a schematic representation of the invention Device in side view.

FIG. 2 is a plan view according to FIG. 1

The knife shield shown schematically in the cutout has a support frame and a multiplicity of propulsion knives 7 on. The support frame consists of a front frame part 4 and a rear frame part 5. On the individual jacking knives 7 a connection joint 1 is arranged, which is connected to the rear frame part 5 via the feed press 8. At the drive-side ends of the two cheeks 9 and 10 of the connecting joint 1 is the wedge-shaped material deflector 2, preferably attached by welding. This wedge-shaped material deflector 2 prevents debris from being briquetted in area 11. Briquetting of debris in area 12 is prevented by the rear deflector element 3 pointing against the direction of advance. This Abweisorgan 3 is preferably from two ploughshare-like metal sheets 13 and 13 'which are welded to one another at their apex. The apex is sloping against the direction of advance. This Abweisorgan 3 has the greatest width on one End edge 14 on. This width is at least as large as the width of the connection joint 1. In addition, there are between the end edge 14 and the side walls 9 and 10 of the deflector 1, the deflector 6 and 6 'attached. These rejectors 6 and 6 'are preferably made of metal sheets and support the clearing work of the deflector 2 when the sole knife 7 is advanced.

Claims (4)

ti Il 111111 Il>) Gw 8052 ',! ! -I I! -! '.07.1980' '' '' D-P Qui / Bü. Protection claims: 1. Blade, whose propulsion blades can be pre-pressed by means of presses supported on the support frame, characterized in that a connecting joint (1) is preceded by a deflector (2) in the form of a wedge with an upright apex at least on the side facing in the direction of advance. 2. Knife shield according to claim 1, dadu r ch ge indicates that the deflector (2) is at least as wide as the connecting joint (1). ϊ 3. knife blade according to claim 1, characterized in that the apex of a wedge-shaped deflector element (3) located under a feed press (8) against the direction of advance is inclined downwards. 4. Knife shield according to claim 1 and 3, characterized in that between an end edge (14) of the deflector (3) and side walls (9 and 10) of the connecting joint (1) deflector organs (6 and 6 ¹ ) are attached, the shape of a Form continuation of the wedge shape of the deflector element (2). «5 * 9« ent «