Solid material comminution or disintegration – Apparatus – Cooperating comminuting surfaces
Patent
1993-12-02
1996-01-02
Eley, Timothy V.
Solid material comminution or disintegration
Apparatus
Cooperating comminuting surfaces
24110173, B02C 108
Patent
active
054801001
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a crushing apparatus for crushing concrete structures by opening and closing arms.
BACKGROUND ART
A known a crushing apparatus for crushing concrete pillars or beams by opening and closing a pair of arms having crushing blades attached to the ends thereof. In crushing concrete structures using such type of crushing equipment, the ends of the arms must be widely opened when the concrete pillars or beams to be destroyed have a large diameter. Furthermore, in order to crush pillars or beams of such large diameter, a large crushing force is required because of such large diameter. However, once the pillars or beams are cracked first crushed, they can be crushed thereafter completely without requiring a force as large as the initial force.
On the other hand, the pillars or beams having a relatively small diameter for which the ends of the arms are not required to be widely opened do not require a large crushing force.
As a drive source for opening and closing the arms, that is, as a drive source for conferring a crushing force onto the crushing blades attached to the arms, normally a hydraulic cylinder is used. When using a hydraulic cylinder, it is necessary for the piston to have a large pressure-receiving area in order to produce a larger crushing force. However, the increase in the pressure-receiving area of the piston entails a reduction in the moving speed of the piston rod, that is, the reduction in opening and closing speed of the arms, which reduces the crushing operation efficiency. The concrete structures comprise pillars and beams range from large to small-diameter. There is no need for a large crushing force to be applied to pillars or beams of larger diameter once they have been crushed and cracked. Nevertheless, in order to crush pillars or beams of large-diameter, a hydraulic cylinder fitted with a piston having a large pressure-receiving area must used as a drive source for opening and closing the arms of the hydraulic cylinder. Thus, the same hydraulic cylinder must be used for crushing pillars or beams of small-diameter or the once crushed cracked pillars or beams, thereby reducing the efficiency of the crushing operation.
In order to solve the above problems, applicant invented an apparatus for crushing concrete structures using a telescopic hydraulic cylinder as a drive source for opening and closing the arms of the crushing apparatus, and has filed a patent application in Japan. The content of this invention is disclosed in Japanese Patent Laid-open Publication No. 63-40061.
The telescopic cylinder comprises a plurality of hydraulic cylinders, each cylinder including an oil port for the backward stroke provided in the outer periphery of the cylinder and communicating with the end of the piston-rod-side oil chamber, and an oil port for the forward stroke provided in the cylinder bottom, whereby, the cylinders of respective stages are reciprocated by supplying the hydraulic oil through the oil ports.
FIG. 4 illustrates a conventional telescopic hydraulic cylinder by way of example. This telescopic hydraulic cylinder comprises an outer cylinder 102 and a plurality of inner cylinders 101, each being fitted into another in sequence and having the above-described constitution. The cylinders are caused to be displaced forward by virtue of the hydraulic oil introduced through an oil port 103 provided in the cylinder bottom of the outer cylinder 102 in descending order according to the size of the cross-sectional area of cylinder bottom, thereby ensuring an initial high output and forwardly displacing the cylinders having a smaller sectional area in sequence in accordance with the extension of the stroke to speed up the protruding action in inverse proportion to the decrease in the output. Such output characteristics of the conventional cylinder are suitable for such hydraulic equipment as requiring a high output at initial drive and having a load decreasing in accordance with the increase in the extension of the stroke, for example, for a drive
REFERENCES:
patent: 2933070 (1960-04-01), Trumper et al.
patent: 4227850 (1980-10-01), Farmer et al.
patent: 4296679 (1981-10-01), Mattsson
patent: 4523512 (1985-06-01), Hessel et al.
patent: 5199658 (1993-04-01), Bartels et al.
Kozaki Takaharu
Tagawa Itsuo
Eley Timothy V.
Tagawakougyou Co. Ltd.
LandOfFree
Apparatus for crushing concrete structures does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for crushing concrete structures, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for crushing concrete structures will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-230444