SI9500127A - Striking wheel-shaped crusher - Google Patents

Description

The invention relates to impact crusher with the features of the introductory part of claim 1.

As a blower, the impactor sucks in such crushers (VGB Kraftvverkstechnik 70 (1990), pages 587 to 590) from the combustion chamber of hot flue gases which, during crushing, dry off the feed supplied to the crusher. To the extent that the percussion apparatus is mounted on the same impeller mounted on the same crusher shaft, the flue gases and offal are mixed to a certain extent before proceeding to the impeller. If such a percussion instrument is absent, as is the case with pure impact crushers of the specified type, there is a risk that the flow of hot gas and offal will strike the impact wheel unevenly. As a result, the individual axial regions of the impactor wheel are fluidly laden, preferably by hot flue gas, and the other by gravity. In this way, individual areas are highly thermal and others are heavily eroded. Due to this uneven load, the impact wheel can be subtly worn in terms of crushing capacity, crushing stability and strength.

It is an object of the invention to balance the impactor load of this crusher.

This task is solved by the features of the characteristic part of claim 1 in a crusher of this invention. Preferred embodiments of the invention are the subject of claims.

The projections of the blades cause the flue gas to swirl as it enters the impactor. In this way, the offal is distributed more evenly in the flue gas flow and after the cross section of the impact wheel. In this way, the impact wheel is subjected to a more uniform load in terms of temperature and erosion, allowing the impact wheel to be optimally constructed and the life of the shredder extended.

An embodiment of the invention is shown in the drawing and is presented in more detail below. In this respect, FIG. 1 is a longitudinal cross-sectional view of a wheel crusher and FIG. 2 is a detail Z of FIG. 1.

The presented impact crusher is designed to grind flat brown coal using hot flue gas as a drying and carrier gas. The shredder comprises a housing 1 with a funnel inlet 2 and an outlet 3. The outlet 3 is connected through a transition piece or grating by a non-exposed powder line leading to a coal dust burner. The housing 1 rotates the impact wheel 4, which is arranged on the crusher single-sided shaft 5. Shaft 5 is driven by engine 6. In the area of impact wheel 4, housing 1 is provided with armor inside.

Impact wheel 4 comprises an axial inlet and a radial outlet, and consists of two interconnected plates 7, 8, with blades 9 arranged between them. The rear plate 8 is secured to the shaft 5 and protected by a front face plate 10. The front plate 7 is annular in design , wherein the opening of the plate 7 corresponds to the axial inlet of the impact wheel 4 into which the inlet portion 2 of the housing 1 passes. The blades 9 consist of wear-resistant, substantially flat plates which are secured to the plate 7, 8 of the impact wheel 4 by means of holders.

Offal, e.g. flat brown coal is fed to the shredder via the downhole connected to the inlet part 2 of the housing 1. At the same time it sucks like a blower-operated impact wheel 4 over a falling shaft from the combustion chamber of the hot boiler flue gas as a drying and carrier gas to crush the shredder during crushing sushi. The debris supplied slides through the funnel inlet 2 to the rear of the impactor 4. Here, the blades 9 capture the debris and throw it into the housing 1 until it is crushed until the carrier gas is taken with it and carried through the outlet 3. S by this accumulation of debris on the impact wheel 4, the blades 9 in the portion facing the rear plate 8 are subject to increased erosion. At the same time, the hot carrier gas is contacted preferably with the front of the blades 9. The load on the impact wheel 4 is therefore uneven with respect to temperature and erosion. To avoid this drawback, the blades 9 are designed as described below.

Parallel to the crusher shaft 5, the projecting, inwardly facing edge of the blade 9 protrudes from the outside of its width and extends into the inlet cross section of the impactor wheel 4. The projection 11 thus formed lies on the portion of the blade 9 that faces the inlet or the inlet. the annular plate 7 of the impeller 4. The projection 11 may be molded or subsequently welded to the shovel. The width of the projection 11 is about 1 to 40% of the width of shovel 9. The value of 5 to 20% is preferably selected. The height of the projection 11 corresponds to 0.1 to 1 times the value of the total height of the shovel 9. The lateral edges of the projection 11 may extend perpendicular to or at an angle to the shredder shaft 5. Here, the projection 11 may be as shown in FIG. 2, takes the form of a trapezoid.

In the inlet cross section of the impactor 4, the projecting projection 11 receives a portion of the delivered offal, whereby the blades 9 trap the offal along its entire width so that the entire vane 9 comes in contact with the offal. At the same time, the projections 11 from inside receive part of the delivered offal with the hot carrier gas supplied as well. In this area, the dried crude crumbs are dried to cool them, so as to avoid hot strands of unused leakage carrier gas, whereby the carrier gas assumes a uniform temperature through the cross section of the impactor 4.

The exact position of the projection 11 in the inlet portion of the shovel 9 depends on the operating conditions of the shredder. The projection 11 can therefore be adjusted in the longitudinal direction of the blade 9. The position of the projection should be such that the impact wheel 4 is fluidly loaded with crumbs and hot carrier gas as uniformly fluidly as possible. Referring to the plan, the projection 11 starts very close to the front annular plate 7 of the impact wheel 4. This arrangement is particularly preferred.

Depending on the construction of the impact crusher, the impact wheel 4 may be provided with 8 to 16 blades 9. All of these blades 9 may be provided with projections 11. It may also be that projections 11 comprise only individual blades 9. With an even number of blades 9, at least opposite the shovel 9, the projection 11 would be maintained to avoid imbalance of the impact wheel 4. While such symmetrical arrangement is preferable, however, due to the high weight of the impact wheel 4, certain imbalances can be transmitted by the asymmetrical arrangement of the blades 9 equipped with projections 11 .

Claims (6)

Patent claims Claims 1. Impact crusher with impact wheel (4), which is secured to the crusher shaft (5) inside the crusher housing (5), comprising axial inlet and radial outlet, with blades (9) arranged between the plates (7, 8). ), characterized in that the edge of the shovel (9) facing inwardly at a part of the width of the shovel (9) protrudes inwardly into the inlet cross section of the impactor (4), and that the projection (11) faces the inlet of the impactor wheel (4) the width corresponding to 1 to 40%, preferably 5 to 20%, the width of the shovel (9). Impact crusher according to claim 1, characterized in that the height of the projection (11) corresponds to the maximum height of the entire shovel (9). Impact crusher according to claim 1 or 2, characterized in that all the blades (9) of the impact wheel (4) are provided with projections. Impact crusher according to claim 1 or 2, characterized in that only the individual blades (9) of the impact wheel (4) are provided with projections. Impact crusher according to claim 4, characterized in that the projections (11) are provided with blades (9) arranged symmetrically in the impact wheel (4). Impact crusher according to one of Claims 1 to 5, characterized in that the projection (11) is adjustable in the longitudinal direction of the shovel (9).