Brushing – scrubbing – and general cleaning – Attachments – Moving surface scraper – wiper – or brush
Patent
1981-12-11
1984-03-06
Roberts, Edward L.
Brushing, scrubbing, and general cleaning
Attachments
Moving surface scraper, wiper, or brush
101157, B02C 440
Patent
active
044345224
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to knife scrapers for rotating drums, particularly the drums of cylinder mills with a knife beam that holds the knife and a counterweight that presses the knife against the associated drum.
2. Background Art
Knife scrapers have been used as auxiliary elements, particularly in milling. Such have been of significant importance for the operating safety of cylinder mills. For the knife scraper to carry out its intended function it is imperative that each knife scraper adequately contact the drum along the entire length of its blade yet only press lightly against it. It is necessary with smooth drums, such as those used to roll grain products to produce powder and flour, etc., that the knife scraper constantly keep the drum free of adhering flour particles in order to prevent the milled product from "rolling up" on the drum. Locally adhering products can lead to a change in the milling conditions and creates the danger that this could damage the drums during the milling process. Thus, it is very important, in the interest of the proper operation of the entire cylinder mill, that the knife scraper function reliably. For this reason such knife scrapers must be constantly aligned and readjusted. One of the essential disadvantages of prior art knife scrapers has been a result of the awkwardness of adjusting the knife, because the knives must be hand adjusted as a rule after the drums are resurfaced and when a new knife is put in. Customarily each knife is very precisely adjusted with a straight edge and an opposing light. If the adjustment is not exactly and immediately true, additional weights, etc. are often used to better forceseat the knife onto the drum, causing certain disadvantages.
In the case of one known knife scraper (CH-A-316 484) a number of pressure pistons are pressed against the knife beam from a support tube that is filled with hydraulic fluid. No matter how carefully all the individual elements of this known device are produced and assembled there is always a cerain leak-loss of hydraulic fluid, which requires constant readjustment. As a result this device is not suited for use for mill drum purposes and it is no longer possible to individually adjust the knife by hand with the prior-known solution. The only way to bring the knife into proper contact along the entire blade length is to simultaneously increase the pressure on all pressure pistons. The danger inherent in this is relatively increased knife wear.
With a prior-known knife scraper (CH-A-328 826) the knife beam is also pressed by individual hydraulic elements in the cutting direction of the knife. But even this solution is unsuitable for mill drum installations. In both cited prior art cases a relatively large-scale construction expenses is necessary with at best less than satisfactorily adequate operation for a mill drum installation.
DISCLOSURE OF INVENTION
Proceding from this point the goal of the invention is to find a knife scraper of the type mentioned at the outset that substantially lacks the disadvantages associated with solutions discussed above, can be installed with little construction expense, is economical to manufacture, and makes it especially possible to easily and quickly adjust the knife. Furthermore, the knife should be constructed so as to be self-adjusting in normal operation.
The invention teaches a solution in the form of a knife scraper of the type discussed at the outset with several mechanical tension elements distributed along the length of the knife by means of which the blade of the knife is pressed against the drum with the additional slight elastic flex of the surface of the knife extending beyond the knife beam. With the knife scraper according to the invention it is possible for even minimally trained service personnel to immediately and exactly adjust the knife scraper. The knife scraper according to the invention is also able to conform to the shape of the knife to the local contour of the drum, to press the knife against the drum to produce the
REFERENCES:
patent: 743955 (1903-11-01), Thompson
patent: 1411907 (1922-04-01), Brunner
patent: 2399538 (1946-04-01), Berry
patent: 3040442 (1962-06-01), Overton
patent: 3378876 (1968-04-01), Sisson
Gebruder Buhler AG
Roberts Edward L.
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