JP3570983B2 - Demolition machine attachment for construction machinery - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an attachment for opening and closing a crushing claw attached to a tip of an arm of a construction machine such as a power shovel with a cylinder, and more particularly to a dismantling machine attachment for a construction machine used for dismantling a reinforced concrete structure.
[0002]
[Prior art]
In the demolition work of reinforced concrete structures and other structures, a large amount of reinforcing bars and fittings are discharged together with the concrete crushing blocks. As attachments for the demolition work, there are crushing claws (generally fixed claws and movable claws) for crushing concrete, and attachments (dismantling machine attachments) provided with a cutting blade for a reinforcing bar at the rotation base of the crushing claws. .
[0003]
In order to separate and collect the crushed and separated concrete mass and the reinforcing bars or metal fittings, a casing for accommodating a magnet in the fixed claw main body is provided. A disassembler attachment that adsorbs and separates metals such as reinforcing bars and metal fittings by providing means for adjusting the transmitted magnetic force can be found in Japanese Patent No. 25656350. There is an example in which an electromagnet is used as a means for adjusting the magnetic force.
[0004]
In addition, a permanent magnet is housed in a coupling frame of the non-magnetic frame portion and the magnetic frame portion with respect to the fixed claw body, and a link mechanism is attached to a rotating shaft of the movable claw so as to linearly reciprocate between the two frame portions. A disassembler attachment in which a magnet is connected via a rotator is disclosed in Japanese Patent No. 2650854.
[0005]
[Problems to be solved by the invention]
When an electromagnet is used, a battery or a generator is required, so that the use time is limited, and in some cases, there is a possibility that the adsorbed cutting rebar or metal fittings may fall. In the case of a permanent magnet, the above-mentioned concerns are resolved, but the switching between the attraction and the separation is more difficult than with the electromagnet, and means for exclusively changing the distance of the magnet to the attraction surface is used. In the above-mentioned Japanese Patent No. 2650854, the above-described means is achieved by moving the magnet in parallel and further confining the lines of magnetic force by the non-magnetic frame. However, the interlocking mechanism between the magnet and the movable claw is complicated, and the frame and the magnet are slid in contact with each other to confine the lines of magnetic force. Tends to increase. Therefore, the purpose of this study was to develop a dismantling machine attachment that uses a permanent magnet, has a simple structure, is free from failure, and can withstand severe movements and shocks.
[0006]
[Means for Solving the Problems]
The present invention relates to an attachment which is attached to the tip of an arm of a construction machine and opens and closes a crushing claw (a fixed claw and a movable claw) with a cylinder, and includes an oscillating magnet that reciprocates along the bottom plate inner surface of the crushing claw. A disassembler attachment for a construction machine having a projection built in the crushing claw and provided on the outer surface of the bottom plate in the middle of a reciprocating swinging area of the swinging magnet so as to cross the swinging direction of the swinging magnet.
[0007]
Iron scraps, etc. are attracted to the outer surface of the bottom plate where the oscillating magnet is located, and try to move along the outer surface of the bottom plate following the reciprocating swing of the oscillating magnet. As a result of the hindrance of the movement, the distance from the oscillating magnet becomes longer, the magnetic force is weakened, and the magnet falls. Adsorption of iron scraps or the like may be on any of the bottom plate outer surfaces bordering the ridge. The protrusions may be of any shape or size as long as they hinder the movement of iron scraps moving along the bottom plate, but are provided on the outer surface of the bottom plate so as to extend perpendicular to the swinging direction of the swing magnet. It is desirable. The oscillating magnet is preferably provided at the tip of an oscillating arm pivotally mounted on the pivot axis of the movable claw provided on the fixed claw body so as to interlock with the movable claw arm.
[0008]
Basically, the movement of the stubs hinders the movement of iron scraps.However, in order to achieve better adsorption and separation at the stubs, the bottom plate must be separated from the magnetic area and non- It is preferable to divide the magnetic region, adsorb iron chips and the like in the magnetic region, and drop the iron chips and the like adsorbed to the magnetic region by the swing magnet reaching the non-magnetic region. The magnetic region has the function of reducing the magnetic force on the outer surface of the bottom plate by concentrating the lines of magnetic force of the oscillating magnet to ensure adsorption on the outer surface of the bottom plate, and dispersing the lines of magnetic force on the outer surface of the bottom plate. The combination of the difference in the degree of adsorption and the hindrance of movement by the ridges can achieve better adsorption and separation at the ridges.
[0009]
In the present invention, the oscillating magnet does not come into sliding contact with the fixed claw body at all, and may be separated from the inner surface of the bottom plate. This is because the adsorption and separation of iron scraps and the like are realized only by changing the distance of the oscillating magnet. Therefore, wear of the link or the pin cannot occur.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a dismantling attachment of the present invention will be described with reference to the drawings. FIG. 1 is an overall side view of a construction machine equipped with a dismantling attachment according to the present invention, FIG. 2 is a side view showing a state where a movable claw is opened, FIG. 3 is a side view showing a state where a movable claw is closed, and FIG. FIG. 2 is a plan view, FIGS. 5 and 6 show another embodiment, FIG. 5 is a side view showing a state where the movable claw is opened, and FIG. 6 is a side view showing a state where the movable claw is closed. .
[0011]
As is clear from FIG. 1, the demolition machine attachment of the present invention is an attachment that is attached to the tip of an arm of a construction machine such as a power shovel and opens and closes a fixed claw and a movable claw with a cylinder. Instead of the bucket of the power shovel, the rotation mounting shaft 4 of the fixed claw main body 3 is mounted on the distal mounting shaft 2 of the main body arm 1, and the front link 6 and the original link mounting shaft of the main body arm 1 are mounted on the front link mounting shaft 5 thereunder. The original link 8 is attached to 7, and the rotating cylinder 10 of the fixed claw body 3 is attached to the intermediate connecting shaft 9 between the destination link 6 and the original link 8. The movable claw 11 is supported by a movable claw rotation shaft 12 of the fixed claw body 3, and the lower claw 13 of the fixed claw body 3 and the upper claw 14 of the movable claw 11 are attached to be openable and closable. The disassembly attachment is opened and closed by the operation of a hydraulic cylinder 17 provided between a mounting boss 15 at an intermediate portion of the movable claw 11 and a mounting hole 16 at the base of the fixed claw body 3.
[0012]
Details of the fixed claw body 3 of the dismantling machine attached to the tip of the main body arm 1 include a lower claw 13 in front and a bottom plate formed of a non-magnetic region as shown in FIGS. The plates 20a and 20b form an arc. The oscillating magnet 21 is provided with a oscillating arm 23 that rotates in conjunction with a movable claw arm 22 on a rotating shaft 12 of the movable claw 11 provided on the fixed claw body 3, and is attached to the tip of the oscillating arm 23. I have. The reciprocating swing range of the swing magnet 21 is housed in the fixed claw body 3 and is closed to the outside. For this reason, there is no possibility that iron chips or the like enter the fixed claw body 3 and are directly attracted to the swing magnet 21.
[0013]
Attraction and separation by the oscillating magnet 21 are as follows. First, the movable claw 11 having the reinforcing bar cutting blade 26 near the rotating shaft 12 cuts the reinforcing bar or the like into an appropriate length to produce iron chips. Next, when the dismantling machine attachment is opened (FIG. 2), the swinging magnet 21 moves forward and the swinging magnet 21 faces the non-magnetic plate 20a, and exerts a magnetic force directly below the bottom plate of the fixed claw body 3, It can adsorb iron scraps. When the disassembler attachment is closed from this state (FIG. 3), the swinging magnet 21 retreats upward while swinging, and the swinging magnet 21 faces the non-magnetic plate 20 b that straddles the ridge 25. At this time, the iron dust adsorbed on the outer surface of the bottom plate in the non-magnetic plate 20a tends to move as the swinging magnet 21 swings, but cannot move due to being hindered by the protruding ridges 25. As the distance increases, the magnetic force weakens, and as a result, it falls. In this example, conversely, the non-magnetic plate 20b attracts iron chips and the like, and the rocking magnet 21 can be made to face the non-magnetic plate 20a to drop the iron chips and the like.
[0014]
In order to better realize the adsorption and separation of the iron scrap, it is preferable to provide a difference in the magnetic force that can be exerted according to the position of the oscillating magnet. For example, in the examples shown in FIGS. 5 and 6, the magnetic plate 19, which is a magnetic region, is assigned to the bottom plate of the fixed claw body 3 corresponding to the non-magnetic plate 20a. The oscillating magnet 21 is the same as that of the above-described example. An oscillating arm 23 that rotates in conjunction with the movable claw arm 22 is provided on the rotating shaft 12 of the movable claw 11 provided on the fixed claw main body 3. It is attached to the tip of the moving arm 23. As in the above example, the reciprocating swing range of the swing magnet 21 is closed to the outside by being housed in the fixed claw body 3, so that iron scraps or the like enter the fixed claw body 3 and move to the swing magnet 21. There is no direct adsorption.
[0015]
The difference from the above example is that the swing magnet 21 reciprocates between the magnetic plate 19 and the non-magnetic plate 20 with the ridge 25 as a boundary. The adsorption of iron scraps is realized mainly on the magnetic plate 19 side. The magnetic plate 19 plays a role of attracting and converging magnetic lines of force emitted from the oscillating magnet 21, and more easily attracts iron chips when the oscillating magnet 21 faces the magnetic plate 19. On the other hand, the non-magnetic plate 20 avoids the lines of magnetic force and disperses the lines of magnetic force, so that even if iron swarf moves over the ridge 25 as it is, the magnetic force acting on the adsorption is weakened. State. Due to such a difference in the adsorption force and the hindrance of the movement by the ridge, the adsorption and separation of the iron swarf can be better realized.
[0016]
【The invention's effect】
The disassembler attachment of the present invention uses a permanent magnet that is not in contact with the claw body and the like, and uses a mechanism that easily links this permanent magnet with the movable claw. It is characterized by less wear and tear, excellent durability, and less failure. Therefore, it is possible to provide a structure that can withstand the movement and impact of the dismantling machine that is severely handled.
[Brief description of the drawings]
FIG. 1 is an overall side view of a construction machine equipped with a dismantling attachment according to the present invention.
FIG. 2 is a side view in a state where a movable claw is opened.
FIG. 3 is a side view showing a state in which a movable claw of FIG. 2 is closed.
FIG. 4 is a bottom view in a state where the movable claw in FIG. 2 is closed.
FIG. 5 is a side view showing another example in a state where a movable claw is opened.
FIG. 6 is a side view showing a state where the movable claw in FIG. 5 is closed.
[Explanation of symbols]
3 Fixed claw body 19 Magnetic plate 20 Non-magnetic plate 21 Swinging magnet 25 Protrusion

Claims (1)

An attachment attached to the tip of the arm of the construction machine to open and close the crushing claw with a cylinder, wherein a rocking magnet that reciprocates along the inner surface of the bottom plate of the crushing claw is built in the crushing claw, A dismantling attachment for a construction machine, wherein a projection that crosses the swinging direction of the swinging magnet is provided on an outer surface of the bottom plate in the middle of a reciprocating swinging area of the magnet.

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