JP4021385B2 - Concrete crusher - Google Patents

Description

  The present invention relates to a concrete crusher that finely breaks reinforced concrete pieces and separates the concrete and the reinforcing bars.

  As shown in FIGS. 6 and 7, the conventional concrete crusher 1a has a fixed jaw 2 rotatably attached to the tip of an arm 12 of a work machine 11 and a movable jaw 3 that can be opened and closed on the fixed jaw 2. The concrete piece 21 is crushed by opening and closing the movable jaw 3 with respect to the fixed jaw 2 by the expansion and contraction operation of the hydraulic cylinder 4. In particular, the concrete crusher 1a used when crushing a reinforced concrete piece 21 (hereinafter referred to as an RC piece 21) crushes the RC piece 21 with the fixed jaw 2 and the movable jaw 3 at the same time as the fixed jaw 2 and the movable jaw 3. The rebar is cut by the cutters 5 and 5 provided on the surface, and the rebar waste 21a dropped on the ground is attracted and collected by the magnet 6a provided on the opposite side of the fixed jaw 2 from the movable jaw 3 (for example, Patent Document 1).

Japanese Patent No. 2563850

  In the conventional concrete crusher 1 a, most of the reinforcing bar scraps 21 a cut by the cutters 5 and 5 fall directly below the fixed jaw 2. However, a part of the reinforcing bar scraps 21a scatters in all directions of the concrete crusher 1a and falls to a position farther from the work machine 11 than the crushing position of the RC piece 21. For this reason, even if the RC piece 21 is crushed at a position in the vicinity of the work machine 11, it is necessary to collect the reinforcing bar scraps 21 a at a position away from the work machine 11. When collecting the reinforcing bar scraps 21a with the conventional concrete crusher 1a, the rotation support of the fixed jaw 2 with respect to the arm 12 of the work machine 11 is the same as the state of crushing the RC piece 21 (the state of the solid line in FIG. 6). The concrete crusher 1a is rotated around the shaft 2a so that the attracting surface of the magnet 6a faces downward. However, in this state, since the magnet 6a is positioned closer to the work implement 11 than the tip of the arm 12 of the work implement 11, the reinforcing bar scraps 21a are adsorbed only in a range narrower than the range where the tip of the arm 12 of the work implement 11 reaches. Can not. More specifically, as shown by the one-dot chain line in FIG. 6, the arm 12 of the working machine 11 is fully extended forward, and the concrete crusher 1a is rotated so that the concrete crusher 1a is pushed forward. Even if a portion reaches the reinforcing bar scraps 21a, the attracting surface of the magnet 6a faces sideward as shown in the figure, so that the reinforcing bar scraps 21a cannot be attracted. Therefore, the adsorption collection range of the reinforcing bar scraps 21a is narrowed.

  On the other hand, the reinforcing bar scraps 21a adsorbed by the concrete crusher 1a are loaded on a loading platform of a transport vehicle not shown. When the reinforcing bar scraps 21a are loaded on the transport vehicle, as shown by a two-dot chain line in FIG. 6, when the attracting surface of the magnet 6a is inclined, the reinforcing bar scraps 21a slide on the attracting surface of the magnet 6a and It becomes dense on the lower side. In this state, the reinforcing bar scraps 21a may interfere with each other and fall to the ground. For this reason, it is necessary to perform the loading operation in a state where the attracting surface of the magnet 6a is vertically downward. However, when the attracting surface of the magnet 6a is directed vertically downward, in the conventional concrete crusher 1a, the height is lowered by an amount corresponding to the height of the concrete crusher 1a from the tip of the arm 12 of the work machine 11. Only the reinforcing bar scraps 21a can be loaded. Therefore, in the conventional concrete crusher 1a, there is a problem that the reinforcing bar scraps 21a can be loaded only on a small transport vehicle with a low loading platform, and cannot be loaded on a large transport vehicle with good transport efficiency.

  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 capable of performing rebar scrap collection and loading operations over a wide range.

  A concrete crusher according to a first aspect of the present invention is a fixed jaw that is pivotally attached to the tip of an arm of a work machine, and that is pivotally attached to the fixed jaw and opens and closes with respect to the fixed jaw by a telescopic operation of a cylinder In a concrete crusher for crushing with a piece of concrete sandwiched between the fixed jaw and the movable jaw, a proximal end side is pivotally supported by a pivotal support shaft of the movable jaw. A swing arm having a distal end extending substantially the same length as the movable jaw, a magnet attached to the distal end of the swing arm, and a first connecting the movable jaw and the distal end of the swing arm to each other. Connecting means.

  This concrete crusher is configured as described above. When the swing arm is connected to the movable jaw by the first connecting means, the magnet is disposed in the vicinity of the distal end portion of the movable jaw. When absorbing and collecting the reinforcing bar scraps, the concrete crusher is rotated so as to be pushed forward with respect to the arm of the work machine, and the tip of the concrete crusher is directed forward or obliquely downward. At this time, the magnet is disposed at a position ahead of the arm tip of the work implement with its attracting surface directed downward. Therefore, the reinforcing bar scraps can be absorbed and recovered in a wider range than the reach of the arm tip of the work implement, and the reinforcing bar adsorption and recovery range is widened.

  In addition, when loading the reinforcing bar scraps attracted by the magnet onto a large vehicle, the reinforcing bar scraps are attracted and collected so that they do not interfere with each other and fall to the ground, that is, the magnet attracting surface is directed downward. The work machine arm is directed obliquely upward. At this time, since the magnet is located at substantially the same height as or higher than the tip of the arm of the working machine, the reinforcing bar can be loaded at a higher position than the conventional concrete crusher.

  As described above, the concrete crusher of the present invention connects the swing arm to the movable jaw by the first connecting means when the reinforcing bar scraps are collected by adsorption and when the reinforcing bar scraps are loaded into the transport vehicle. At this time, if the swing arm is rotated in accordance with the opening / closing operation of the movable jaw with respect to the fixed jaw, the orientation of the attracting surface of the magnet changes. On the other hand, when the first connecting means is released, the movable jaw can be opened and closed without rotating the swing arm. In a state where the concrete crusher is rotated with respect to the arm of the work machine, the first connecting means is released and the swinging arm is rotated in a direction away from the movable jaw. Is disposed away from the movable jaw. In this state, since the impact when the reinforced concrete piece is crushed is difficult to be transmitted from the movable jaw to the magnet, the magnet is not damaged by the impact.

  The concrete crusher according to claim 2 is configured such that the fixed jaw and the swing arm are moved to each other at a position where the swing arm is rotated in a direction away from the movable jaw in a state where the first connecting means is released. A second connecting means for connecting is provided. The concrete crusher grips and crushes the reinforced concrete pieces before absorbing and collecting the reinforced scraps. When the first connecting means is released and the swing arm is connected to the fixed jaw by the second connecting means, the magnet is maintained at a position away from the tip of the concrete crusher. In this state, even if the reinforced concrete piece is crushed, the impact is not transmitted to the magnet. Moreover, even if the arm of the working machine is swung down to grab the reinforced concrete piece, the magnet does not collide with the ground or the reinforced concrete piece. Furthermore, the area around the movable jaw is not bulky with a magnet, and it is easy to grasp a reinforced concrete piece.

  As described above, the present invention can collect the reinforcing bar scraps at a position ahead of the tip of the arm of the working machine, and therefore, the adsorption recovery range of the reinforcing bar scraps can be expanded as compared with the conventional concrete crusher.

  In addition, when the work machine arm is directed obliquely upward while maintaining the magnet attracting surface downward, the magnet is placed at the same height or higher position as the work machine arm. Compared with the crusher, the reinforcing bar scraps can be loaded at a higher position.

  Furthermore, by releasing the first connecting means and connecting the swing arm to the fixed jaw by the second connecting means, the reinforced concrete piece can be easily grasped, and the magnet is moved by the impact when the reinforced concrete piece is crushed. It can be prevented from being damaged.

  Hereinafter, embodiments of a concrete crusher of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same site | part as the conventional concrete crusher 1a, and detailed description is abbreviate | omitted.

  As shown in FIG. 1, the concrete crusher 1 of the present invention includes a fixed jaw 2 that is rotatably attached to the tip of an arm 12 of a work machine 11, a movable jaw 3 that is rotatably attached to the fixed jaw 2, and a fixed jaw. In a concrete crusher provided with a hydraulic cylinder 4 that opens and closes the movable jaw with respect to the jaw 2, the swing arm 7 is rotatably supported on the same axis as the pivot shaft 3 a of the movable jaw 3. A magnet 6 is attached to the tip of the moving arm 7.

  The swing arm 7 is formed to have substantially the same length as that of the movable jaw 3, and brackets 7a and 7b are formed at the front and rear ends of the tip. The movable jaw 3 and the fixed jaw 2 are formed with brackets 3b and 2b for connecting the brackets 7a and 7b of the swing arm 7. The brackets 7a and 7b of the swing arm 7 are connected to the brackets 3b and 2b of the movable jaw 3 and the fixed jaw 2 by the first and second connecting means 8 and 9, as shown in FIGS. The first and second connecting means 8 and 9 are fixing brackets such as bolts and nuts.

  As shown in FIG. 2, when the swing arm 7 is turned to the movable jaw 3 side and the bracket 7a of the swing arm 7 is connected and fixed to the bracket 3b of the movable jaw 3 by the first connecting means 8, the swing arm 7 rotates in accordance with the opening / closing operation of the movable jaw 3 with respect to the fixed jaw 2. At this time, the magnet 6 moves on an arc centered on the rotation support shaft 3a of the movable jaw 3, and the orientation of the attracting surface changes. On the other hand, the first connecting means 8 is released, and the swing arm 7 is rotated to the fixed jaw 2 side so that the bracket 7b of the swing arm 7 is moved to the bracket 2b of the fixed jaw 2 as shown in FIG. If the connecting means 9 is connected and fixed, the swing arm 7 does not rotate even if the movable jaw 3 is opened and closed with respect to the fixed jaw 2. When the movable jaw 3 is fully opened with respect to the fixed jaw 2 in the state shown in FIG. 2, that is, with the swing arm 7 connected to the movable jaw 3, the magnet 6 is positioned almost at the same position as the magnet 6 in FIG. 3. Placed in.

  The concrete crusher 1 of the present invention is configured as described above. The RC piece 21 on the ground is gripped and crushed, and the reinforcing bar scraps 21a that have fallen on the ground during the crushing are attracted and collected by the magnet 6.

  When the RC piece 21 is gripped and when the RC piece 21 is crushed, the swing arm 7 is connected to the fixed jaw 2 by the second connecting means 9 as shown in FIG.

  When the RC piece 21 is gripped, as shown by the one-dot chain line or two-dot chain line in FIG. 4, the concrete crusher 1 is rotated with respect to the arm 12 of the work machine 11, and the tip portion thereof is directed downward. Then, swing down the arm 12 of the work machine 11. At this time, the magnet 6 does not collide with the ground, the RC piece 21 or the like because the magnet 6 is located away from the tip of the concrete crusher 1 regardless of the open / closed state of the movable jaw 3 with respect to the fixed jaw 2. Further, the tip of the concrete crusher 1 is not bulky with the magnet 6, and the RC piece 21 can be easily grasped.

  When crushing the RC piece 21, as shown by the solid line in FIG. 4, the concrete crusher 1 is rotated with respect to the arm 12 of the work machine 11, and the tip of the concrete crusher 1 is moved to the work machine 11. Turn to the side. In this state, even if the movable jaw 3 is closed and the RC piece 21 is crushed, the magnet 6 is maintained at a position away from the movable jaw 3, so that the impact when the RC piece 21 is crushed is transmitted to the magnet 6. hard. Therefore, the magnet 6 is not damaged by the impact of crushing the RC piece 21.

  At the same time as the RC piece 21 is crushed, the reinforcing bar scraps 21a cut by the cutters 5 and 5 of the concrete crusher 1 fall to the ground. When this reinforcing bar scrap 21a is attracted and collected by the magnet 6 and when the reinforcing bar scrap 21a is loaded on a large vehicle (not shown), the second connecting means 9 is released and the first connecting section as shown in FIG. The swing arm 7 is connected to the movable jaw 3 by means 8.

  When attracting and collecting the reinforcing bar scraps 21a with the magnet 6, the arm of the work implement 11 is in a state where the arm 12 of the work implement 11 is extended forward or folded, as shown by a one-dot chain line and a two-dot chain line in FIG. 12, the concrete crusher 1 is rotated so as to be pushed forward, and the movable jaw 3 side of the concrete crusher 1 is set to the lower side. When the front end portion of the concrete crusher 1 is directed forward, when the movable jaw 3 is opened with respect to the fixed jaw 2, as shown by a one-dot chain line in FIG. When the tip of the concrete crusher 1 is directed obliquely downward, when the movable jaw 3 is closed with respect to the fixed jaw 2, the attracting surface of the magnet 6 faces downward as shown by a two-dot chain line in FIG. In this way, the reinforcing bar scraps 21a on the ground are attracted and recovered with the attracting surface of the magnet 6 facing downward. At this time, the magnet 6 is disposed at a position ahead of the tip of the arm 12 of the work machine 11. Therefore, as shown by a one-dot chain line in FIG. 5, the reinforcing bar scraps 21a at the front position relative to the arm 12 of the work machine 11 can be collected. In addition, in FIG. 5, when absorbing and collecting the reinforcing bar scraps 21a at a position away from the work machine 11, for the sake of convenience, the state where the tip of the concrete crusher 1 is directed forward is shown, but the state is directed obliquely downward However, it is possible to collect the reinforcing bar waste 21a. Further, when the reinforcing bar scraps 21a in the vicinity of the work machine are sucked and recovered, the reinforcing bar scraps 21a can be recovered not only in a state where the tip portion of the concrete crusher 1 is directed obliquely downward but also in a forward direction.

  When the reinforcing bar scraps 21a adsorbed by the magnet 6 are loaded on the loading platform of the large vehicle, as shown by the solid line in FIG. 5, the arm 12 of the work implement 11 is directed obliquely upward, and at the same time, the fixed jaw 2 and the movable jaw 3 The concrete crusher 1 is lifted upward while keeping the attracting surface of the magnet 6 downward. At this time, since the magnet 6 is located at almost the same height as the tip of the arm 12 of the work machine 11, the reinforcing bar scraps 21a can be loaded at a higher position than the conventional concrete crusher 1a.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made. In addition to the fixing brackets such as the above, insertion pins and other various connecting brackets can be used.

It is a side view of the concrete crusher of this invention. It is a side view of the concrete crusher of this invention. It is a side view of the concrete crusher of this invention. It is a side view which shows the state which grips a concrete piece with the concrete crusher of this invention, and crushes this concrete piece. It is a side view which shows the state which carries out the adsorption | suction collection | recovery of reinforcing bar scraps with the concrete crusher of this invention, and loads this reinforcing bar scraps on a large vehicle. It is a side view of the conventional concrete crusher and the working machine to which this is applied. It is a side view of the conventional concrete crusher.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete crusher 2 Fixed jaw 2a Rotation support shaft 2b Bracket 3 Movable jaw 3a Rotation support shaft 3b Bracket 4 Hydraulic cylinder 5, 5 Cutter 6 Magnet 7 Swing arm 8 First connection means 9 Second connection means 11 Work machine 12 Arm 21 Reinforced concrete piece 21a Reinforcing bar scrap

Claims (2)

A fixed jaw rotatably attached to a distal end of an arm of a work machine; and a movable jaw that is rotatably attached to the fixed jaw and opens and closes with respect to the fixed jaw by a cylinder extending and contracting operation. In a concrete crusher that crushes with a piece of concrete between the movable jaw and the movable jaw, the proximal end side is pivotally supported coaxially with the pivot shaft of the movable jaw, and the distal end side is approximately the same length as the movable jaw And a first attachment means for connecting the movable jaw and the distal end side of the swing arm to each other. Concrete crushing machine. A second connecting means for connecting the fixed jaw and the swinging arm to each other at a position where the swinging arm is rotated in a direction away from the movable jaw in a state in which the first connecting means is released; The concrete crusher according to claim 1 characterized by things.