JP4087308B2 - Concrete crusher - Google Patents

Description

  The present invention relates to a concrete crusher used at the time of demolition of a concrete building.

  As shown in FIGS. 5 and 6, the concrete crusher 21 has a lower jaw 22 attached to the tip of an arm 32 of a work machine 31 so that it can be raised and lowered, and an upper jaw 23 is attached to the lower jaw 22 so that it can be opened and closed. The concrete block C is crushed by driving the upper jaw 23 to open and close with respect to the lower jaw 22 by a hydraulic cylinder 24 provided on the upper side. In particular, as a concrete crushing machine 21 used for crushing a reinforced concrete block, the concrete block C is bitten by the lower jaw 22 and the upper jaw 23, and the reinforcing bars are cut by the cutters 25 and 25 provided on the lower jaw 22 and the upper jaw 23, so that they are ground. There is one in which the dropped reinforcing bar scraps R are attracted and collected by a magnet 26 provided on the bottom surface of the lower jaw 22 (see, for example, Patent Document 1).

Japanese Patent No. 2563850

  In the conventional concrete crusher 21, the magnet 26 is provided on the bottom base end side of the lower jaw 22 for the convenience of installation space. When the magnet 26 is brought close to the ground in a state where the reinforcing bar scraps R are adsorbed, that is, in a state where the tip of the lower jaw 22 is directed toward the work implement 31, the lower portion of the magnet 26 is below the magnet 26 when viewed from the cockpit 33 of the work implement 31. It is blocked by the tip and becomes a blind spot. For this reason, the operator cannot visually observe the moment when the reinforcing bar scraps R are attracted by the magnet 26, and there are many adsorption leaks of the reinforcing bar scraps R.

  The present invention has been invented in view of such a problem, and an object of the present invention is to provide a concrete crusher with improved visibility below a magnet.

A concrete crusher according to the present invention has a lower jaw mounted on a tip of a swing arm of a working machine so that the lower jaw can be raised and lowered, and an upper jaw can be opened and closed on the lower jaw, and a piston of a hydraulic cylinder provided between the lower jaw and the upper jaw. In a concrete crushing machine for crushing a concrete lump by opening and closing the upper jaw with respect to the lower jaw by advancing and retracting a rod, one end is connected to the lower jaw via a link, and the other end is pinned to the upper jaw A protective cover that swings with the opening and closing operation of the upper jaw at a position that always covers the outside of the piston rod of the hydraulic cylinder, and a magnet that is attached to the protective cover and can attract the reinforcing bar waste by magnetic force the provided, communicating with connection points of the lower jaw and upper jaw, and a connecting portion of the upper jaw and the protective cover, and a connecting portion of the protective cover and the link, and a connecting portion of the link and the lower jaw And to constitute a link mechanism, in the opened state or closed state of the upper jaw by the cylinder for swinging the upper jaw, a magnet is attached to the protective cover is to maintain the suction working posture state.

  According to the above configuration of the present invention, in a state where the reinforcing bar scraps are adsorbed, that is, in a state where the lower end of the lower jaw is directed to the opposite side of the working machine and the magnet is directed downward, the magnet is more than the proximal end portion of the upper jaw. Located on the side. If the magnet is brought close to the ground in this state, the blind spot does not become a blind spot when viewed from the cockpit of the work machine. Further, even if the protective cover swings with the opening and closing operation of the upper jaw, the direction of the protective cover with respect to the lower jaw is hardly changed by the link. Thereby, since the direction of the magnet with respect to the lower jaw is hardly changed by the opening / closing operation of the upper jaw, the reinforcing bar scraps can be adsorbed regardless of the opened / closed state of the upper jaw.

  In the present invention, as described above, the magnet is positioned closer to the work implement than the rear end portion of the upper jaw in a state in which the reinforcing bar scraps are adsorbed. Thereby, since the moment of adsorption | suction of a reinforcing bar waste can be visually observed from the cockpit of a working machine, the leakage leakage of a reinforcing bar waste can be suppressed.

  Even if the protective cover swings as the upper jaw opens and closes, the direction of the protective cover relative to the lower jaw is maintained in a substantially constant direction by the link. do not do. Accordingly, the reinforcing bar scraps can be adsorbed regardless of the open / closed state of the upper jaw.

  Hereinafter, the concrete crusher of this invention is demonstrated, referring drawings.

  FIG. 1 is a side view illustrating a concrete crusher 1 according to the present invention, and FIG. 2 is an exploded perspective view of the concrete crusher. As shown in FIG. 1, the concrete crusher 1 has a lower jaw 2 attached to a distal end of an arm 32 of a working machine 31 (see FIG. 5) so that it can be raised and lowered, and an upper jaw 3 is attached to the lower jaw 2 so that it can be opened and closed. The upper and lower jaws 3 are driven to open and close with respect to the lower jaw 2 by a hydraulic cylinder 4 provided between the upper jaws 3 to crush the concrete lump C, and a protective cover 5 is provided that swings as the upper jaw 3 is opened and closed. A magnet 6 is attached to the protective cover 5.

  As shown in FIG. 2, the lower jaw 2 is a steel member provided with a crushing lower plate 2b, an outer plate 2c, and reinforcing plates 2d, 2d between a pair of side plates 2a, 2a, and the side plates 2a, 2a are used as working machines 31. It is pinned to the tip of the arm 32 (see FIG. 5) and can be raised and lowered by advancing and retracting a hydraulic cylinder 32a provided on the arm 32. On the upper surface of the crushing lower plate 2b, a plurality of lower blades 2e, 2e,... A blade 2f for cutting reinforcing bars is fixed to the inner surface of the tip end portion of the pair of side plates 2a, 2a with screws and nuts.

  The upper jaw 3 is pin-coupled between the side plates 2a, 2a of the lower jaw 2 between the rear ends, and the piston rod 4a of the hydraulic cylinder 4 and the front end of the protective cover 5 are pin-coupled to the upper middle portion. On the lower surface of the upper jaw 3 facing the crushing lower plate 2b of the lower jaw 2, a plurality of upper blades 3a, 3a for crushing the concrete lump C are projected.

  The hydraulic cylinder 4 has a rear end portion pin-coupled to the rear end side of the lower jaw 2, and a tip end of the piston rod 4 a is pin-coupled to the upper jaw 3, and the upper jaw 3 is moved relative to the lower jaw 2 by driving the piston rod 4 a forward and backward. It is designed to open and close.

  The protective cover 5 is a U-shaped member having an intermediate portion connected to the side plates 2a, 2a of the lower jaw 2 via a link 7 and a front end portion being pin-coupled to the upper jaw 3, and accompanying the opening / closing operation of the upper jaw 3. The outer side of the piston rod 4a of the hydraulic cylinder 4 is always covered and protected. The link 7 is connected to the lower jaw 2 at a position where the connection between the upper jaw 3 and the link 7 of the protective cover 5 is separated from the connection position of the lower jaw 2 and the upper jaw 3. It is formed to have substantially the same length as the interval between the connecting portions with the cover 5. Thereby, the connection part of the lower jaw 2 and the upper jaw 3, the connection part of the upper jaw 3 and the protective cover 5, the connection part of the protective cover 5 and the link 7, and the connection part of the link 7 and the lower jaw 2 are connected to the concrete crusher 1. The protective cover 5 is moved in parallel with the opening / closing operation of the upper jaw 3 (see FIGS. 3 and 4). The link 7 may be configured such that the direction of the protective cover 5 with respect to the lower jaw 2 is slightly changed by the opening / closing operation of the upper jaw 3.

  The magnet 6 is, for example, an electromagnet housed in a casing, attached to the surface of the protective cover 5, and crushed concrete lump C by the lower jaw 2 and the upper jaw 3 to attract and collect the reinforcing bar scraps R that have fallen to the ground. It is.

  Hereinafter, operation | movement of the concrete crusher 1 of this invention is demonstrated.

  In the state of FIG. 1, the concrete block C is crushed by the lower jaw 2 and the upper jaw 3 and the rebar is cut. From this state, the hydraulic cylinder 32a provided on the arm 32 of the work implement 31 is retracted, and the tip of the lower jaw 2 is directed away from the work implement 31 and the magnet 6 is directed downward as shown in FIG. At this time, since the magnet 6 is positioned closer to the work implement 31 than the rear end portion of the upper jaw 3, even if the arm 32 of the work implement 31 is driven to bring the concrete crusher 1 closer to the ground, the operation of the work implement 31 is performed. When viewed from the seat 33, the lower side of the magnet 6 does not become a blind spot.

  FIG. 4 shows a state where the upper jaw 3 is opened from the state shown in FIG. When the piston rod 4 a of the hydraulic cylinder 4 is retracted from the state shown in FIG. 3, the upper jaw 3 rotates around the connecting portion with the lower jaw 2. As the upper jaw 3 rotates, the protective cover 5 swings, and the rotational driving force is transmitted to the link 7 via the protective cover 5. The link 7 rotates while maintaining a parallel state with a line segment connecting the connecting portions of the lower jaw 2 of the upper jaw 3 and the protective cover 5. Thereby, the protective cover 5 moves in parallel with the opening / closing operation of the upper jaw 3, and the direction of the magnet 6 with respect to the lower jaw 2 does not change depending on the opening / closing state of the upper jaw 3. Therefore, the reinforcing bar scraps R can be adsorbed not only when the upper jaw 3 is closed but also when the upper jaw 3 is opened.

  As mentioned above, although it demonstrated per embodiment of this invention, this invention is not limited to the said embodiment, A various change is possible, for example, the protective cover 5 is good also as a casing of the magnet 6. FIG.

It is a side view which shows the concrete crusher of this invention. It is a disassembled perspective view of a concrete crusher. It is a side view of the concrete crusher which shows the state which adsorb | sucks a reinforcing bar waste. It is a side view of the concrete crusher which shows the state which adsorb | sucks a reinforcing bar waste. It is a side view which shows a prior art example. It is a principal part enlarged view of FIG.

Explanation of symbols

1 concrete crusher 2 lower jaw 3 upper jaw 4 hydraulic cylinder 5 protective cover 6 magnet 7 link

Claims (1)

A lower jaw is attached to the tip of an arm of a work machine so that the upper jaw can be raised and lowered, and an upper jaw is attached to the lower jaw so that the upper jaw can be opened and closed. In a concrete crusher that crushes a concrete lump by opening and closing the upper jaw,
A protective cover that is connected to the lower jaw via a link, and a front end portion is pin-coupled to the upper jaw, so that the outer surface of the piston rod of the hydraulic cylinder is always covered with the opening and closing operation of the upper jaw. And a magnet attached to the protective cover and capable of attracting the reinforcing bar scraps by magnetic force ,
Lower jaw and upper jaw connecting portion, upper jaw and protective cover connecting portion, protective cover and link connecting portion, link and lower jaw connecting portion are configured to form a link mechanism, and upper jaw by a cylinder that swings the upper jaw The concrete crusher characterized by maintaining the magnet attached to the protective cover in the adsorption work posture state in the open state or the closed state .