Solid material comminution or disintegration – Apparatus – Rotary striking member with feed or discharge conveyor or...
Reexamination Certificate
1999-03-20
2001-02-20
Rosenbaum, Mark (Department: 3725)
Solid material comminution or disintegration
Apparatus
Rotary striking member with feed or discharge conveyor or...
C241S301000
Reexamination Certificate
active
06189820
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to impact crushers, and, more particularly, to a method and apparatus for adapting a horizontal shaft impact crusher for efficient crushing of different types of materials.
BACKGROUND OF THE INVENTION
Horizontal shaft impact crushers are commonly employed to pulverize many different types of materials including, by way of examples, not limitations, asphalt, concrete, and rock. Such crushers typically include a frame defining a cavity. A rotating impeller driven by an external drive mechanism is disposed within the cavity. The frame includes an opening through which the material to be crushed is inserted into the cavity. One or more breaker plates are generally disposed within the cavity. The rotating impeller repeatedly throws the material to be crushed against the breaker plate(s) thereby breaking the material into small particles.
Horizontal shaft impact crushers generally use a feed plate to help guide the material to be crushed (sometimes referred to as the aggregate) into the hammer circle (i.e., the motion path of the impeller hammers or bars) where it is struck by the impeller bars and crushed. A feed plate is an elongated plate disposed at an angle within the material insertion opening to the cavity of the crusher. The material to be crushed is delivered to the feed plate by a conveyor or the like. The material to be crushed slides down the plate and into the cavity where it is crushed as explained above.
Horizontal shaft impact crushers are generally used to crush a wide range of materials. For example, a crusher may be used to crush asphalt one day, and thereafter be transported to a different site where it is used to crush concrete. Different materials have different physical properties and characteristics that effect their susceptibility to crushing. In view of these differences, applicants have found that it is desirable to insert different materials into crushers at different feed angles. By way of examples, not limitations, concrete and asphalt recycle crushing generally involves large, slabby material that requires a large feed opening to effectively feed the material into the crusher cavity. In contrast, secondary rock crushing involves relatively small uniform material. The crushing of such rock material is generally optimized with a steeper feed angle that allows better penetration into the hammer circle.
Prior art crushers generally employ a single feed plate having a fixed feed angle. This feed angle is generally optimized to work well with one range of material types, but compromises crushing efficiency for other material types.
Feed plates that are removably secured to the frame of an impact crusher are known in the prior art. However, such feed plates are removable to address concerns other than feeding/crushing efficiency such as feed material bridging and assembly considerations. These removable feed plates are not known to have been used in the past to optimize the feed geometry to the properties of the material to be crushed.
SUMMARY OF THE INVENTION
In accordance with an aspect of the invention, a method is provided for adapting a horizontal shaft impact crusher for use with different types of materials. The method includes the steps of: determining a first feed angle for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material; selecting a first feed plate having a second feed angle that at least generally corresponds to the first feed angle; and securing the first feed plate to the crusher.
Optionally, the method may also comprise the steps of: determining a third feed angle for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material; selecting a second feed plate having a fourth feed angle that at least generally corresponds to the third feed angle; removing the first feed plate from the crusher; and securing the second feed plate to the crusher. The third feed angle is different than the first and second feed angles.
In accordance with another aspect of the invention, a kit is provided. The kit includes a first feed plate having a first feed angle for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material. It also includes a second feed plate having a second feed angle for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material. The second feed angle is different than the first feed angle. The first and second feed plates are adapted for interchangeable securement to a crusher to adapt the crusher for enhanced crushing of the first and second types of materials.
Preferably, the kit also includes fasteners for selectively securing the first feed plate or the second feed plate to the crusher.
In accordance with still another aspect of the invention, a feed plate is provided. The feed plate includes a baseplate and a plurality of gussets mounted to the baseplate. Each of the gussets is disposed substantially perpendicularly to the baseplate and defines a crown spaced a distance from the baseplate. The feed plate also includes a faceplate mounted to the gussets. The gussets support the faceplate at an angle to the baseplate. The faceplate has a curved portion dimensioned to mate with and overlie the curved crown of the gussets.
In accordance with a still further aspect of the invention, a method of adapting a horizontal shaft impact crusher for use with different materials comprises determining a first desired feed angle for delivering a first type of material to be crushed to the crusher to achieve enhanced crushing of the first type of material, determining a second desired feed angle for delivering a second type of material to be crushed to the crusher to achieve enhanced crushing of the second type of material, choosing a feed plate from a selected set of feed plates, the selected set of feed plates including a first feed plate having a first desired feed angle adapted for use with the first type of material, the selected set further including a second feed plate having a second desired feed angle adapted for use with the second type of material, and securing the selected feed plate to the crusher.
Other features and advantages are inherent in the apparatus claimed and disclosed or will become apparent to those skilled in the art from the following detailed description and its accompanying drawings.
REFERENCES:
patent: 3186651 (1965-06-01), Briolini
patent: 5257743 (1993-11-01), Brown
patent: 5657933 (1997-08-01), Williams
Cedar Rapids, Inc.,
Marshall O'Toole Gerstein Murray & Borun
Rosenbaum Mark
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