JP2003326181A - Crusher of power shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To collect refuse of a reinforcing rod present at a place separated from a car body or at a high place, in the crusher mounted on the arm of a power shovel to be used for the disassembling work of a concrete building. <P>SOLUTION: In the crusher of the power shovel equipped with a frame 2 having an upper jaw 3 integrally provided to the leading end upper part thereof and connected to the leading end of the arm of the power shovel at its base end in a freely shakable manner, a lower jaw 8 mounted on the frame 2 at its base end and crushing concrete lumps between the upper jaw 3 and the lower jaw 8 under pressure and a magnet 15 for attracting cut pieces of a reinforcing rod, the magnet 15 is mounted on the lower part on the base end side of the frame 2 downwardly. When collection work of refuse of the reinforcing rod is performed, the frame 2 of the crusher is forwardly extended almost horizontally. Therefore, the reinforcing rod can be collected at a place remotely separated from a car body. Even when the arm 21 is extended upwardly, the magnet 15 can be turned downwardly within the shaking range of the crusher 1 and a large work range can be ensured even in an up and down direction. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a crusher attached to the tip of an arm of a power shovel and used for demolition of a concrete building. The present invention relates to a crusher suitable for crushing lumps and picking up reinforced waste. 2. Description of the Related Art A power shovel was originally developed as a machine for excavating earth and sand with a bucket attached to the tip of an arm. However, a rock drill or a hammer is used instead of a bucket at the tip of the arm. It is also used for dismantling concrete buildings. The concrete mass generated by the demolition is in a state of being connected by the reinforcing steel buried inside. In order to reuse such concrete blocks and reinforcing bars, and for convenience of transportation by dump trucks and the like, it is required to crush the concrete blocks and separate concrete and reinforcing bars. Crushers are provided as attachments for power shovels. [0003] As shown in FIG. 4, the crusher 1 is swingably mounted on a tip end of an arm 21 of a power shovel by a bucket pin 25. The upper jaw 3 of the crusher is integrated with the frame 2, and the frame is connected to a bucket cylinder 23 provided on an upper portion of the arm 21 via a front link 22 and is driven to swing. The lower jaw 8 of the crusher has its base end pivotally connected to the frame 2 and is driven to open and close with the upper jaw 3 by a hydraulic cylinder 9 provided inside the frame. The concrete mass to be crushed is placed in the upper jaw 3
The concrete block is crushed by being sandwiched between the lower jaw 8 and the lower jaw 8 with the hydraulic cylinder 9 closing the lower jaw 8. Further, this type of crusher 1 is provided with rebar cutting blades 11a and 11b on the inner side of the crushing portion (the portion for crushing the concrete mass) of the upper jaw 3 and the lower jaw 8, so that the rebar connecting the concrete mass and the transport A bent reinforcing bar that becomes an obstacle to loading and loading can be cut by the cutting blades 11a and 11b. [0005] When crushing a reinforced concrete block using such a crusher, reinforced steel chips cut short during the work may be scattered at the work site. Such rebar scrap was manually collected by an operator, but the work efficiency was low and the work was heavy, and a crusher equipped with a magnet for collecting the rebar scrap was disclosed in Japanese Patent Laid-Open No. 4-155068. JP-A-9-21237
And Japanese Patent Laid-Open No. 11-210237. Of these, those disclosed in JP-A-4-155068 and JP-A-9-21237 have a magnet mounted on the head of the frame.
In the device described in Japanese Patent No. 237, the magnets are mounted on the crushing portions of the upper jaw and the lower jaw. [0006] When a crusher of a conventional structure in which a magnet is provided at the head of a frame to collect rebar scrap widely, as shown in FIG. 4, the frame 2 of the crusher is bent toward the vehicle body. And with the head down.
In this case, since the crusher 1 is retracted toward the vehicle body at the tip of the arm 21, and the swing angle of the crusher 1 toward the vehicle body is limited, the arm 21 cannot be fully extended. For this reason, the range in which the rebar waste can be collected by the magnet 15 is limited. In addition, as shown by the imaginary line in the figure, also in the case of collecting and collecting rebar waste in a high place, the crusher 1 is shaken downward, and the arm 21 cannot be turned upward due to the limitation of the swing angle of the crusher 1. Therefore, the workable height is limited low. [0007] Since the power shovel is provided with a crawler, it is conceivable that the main body only needs to run.
In the state where piles of concrete after dismantling are piled up, it is necessary to remove concrete blocks and reinforcing bars from above, so the car body often can not move forward, and the range and height restrictions that can pick up and collect reinforcing bars are Significantly reduces work efficiency. [0008] On the other hand, the structure in which the magnet is provided in the crushing portion has an advantage that when the concrete mass is crushed, the remaining rebar scrap can be adsorbed and transported as it is. It is unsuitable for picking up relatively small rebar scraps scattered on the ground. That is,
In order to adsorb rebar waste with a magnet, the magnet must be brought close to the rebar, but in general, the crusher is not structured to open the crushing surfaces of the lower and upper jaws to 180 degrees, Therefore, a situation frequently arises in which the upper and lower jaws interfere with each other and the magnet cannot be brought close to the rebar scrap. Since the rebar that is raised so as to be able to approach the crushing part can be gripped by the upper jaw and the lower jaw, it is not necessary to adsorb and transport by a magnet. The present invention has been made in view of the problems of the above-described crusher having a conventional structure, and has an object to obtain a crusher that can collect rebar waste at a location distant from a vehicle body or at a high place. A crusher for a power shovel according to the present invention comprises a frame 2 having an upper jaw 3 integrally provided at an upper end thereof and a base end swingably connected to an arm distal end of the power shovel. A crusher for a power shovel having a lower jaw 8 having a base end pivotally connected to a frame 2 and crushing a concrete mass between the upper jaw 3 and a magnet 15 for attracting a cut piece of a reinforcing bar; The above-mentioned problem has been solved by downward mounting on the base end side lower part of No. 2. The above-described structure of the present invention is particularly suitable for a crusher having a rebar cutting blade 11 fixed to the inner side of the crushing portion of the upper jaw 3 and the lower jaw 8 for crushing a concrete mass. In the crusher having the above structure, as shown in FIG. 3, the crusher frame 2 is extended substantially horizontally forward when picking up and collecting reinforcing steel scrap. Since the arm 21 extends further forward than the tip of the arm 21, it is possible to collect rebar at a location far from the vehicle body. Further, even when the arm 21 is extended upward, the magnet 15 can be directed downward within the swing range of the crusher 1, so that a large working range can be secured in the vertical direction. When the magnet 15 is attached to the lower surface of the lower jaw 8, the working area can be further distant.
Since the lower jaw is often inserted between the concrete masses when crushing the concrete mass, there is a high risk of damaging the magnet, which is inappropriate as a magnet mounting position. It is sufficient that the rebar scrap near the vehicle body is collected by retreating the vehicle body, and another magnet is provided on the top of the frame 2 together with the magnet 15 provided downward at the lower portion on the base end side of the frame 2. If it is provided upward, it is possible to pick up and collect rebar waste from a distance to a nearby place while the vehicle body is stopped, which is convenient for dismantling work in a narrow place where the vehicle body cannot be moved. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a magnet mounting portion of a crusher according to the present invention in cross section. The frame 2 of the crusher 1 is a welded structure made of a steel plate and integrally includes a beak-shaped upper jaw 3 extending forward from the head. Attached to the base end of the frame 2 are two brackets 4 spaced apart in the width direction of the arm of the power shovel (perpendicular to the plane of FIG. 1). There are provided a bucket pin hole 5 for attachment to the vehicle, and a link pin hole 6 for pivotal attachment to the front link. When the frame 2 is mounted on the tip of the arm of the power shovel, the frame 2 swings around the bucket pin hole 5 due to the forward / backward movement of the front link connected to the link pin hole 6. Below the upper jaw 3, a lower jaw 8 whose base end is pivotally attached to the frame 2 with a fulcrum pin 7 is opposed to open and close freely. A hydraulic cylinder 9 having a trunnion structure for connecting the lower jaw 8 and the base end of the frame is built in the frame 2, and the lower jaw 8 is opened and closed with respect to the upper jaw 3 by the reciprocating operation of the hydraulic cylinder. . As shown schematically in FIG. 2, the upper jaw 3 is a structure in which a plurality of steel plates are welded in a cross-girder shape, and a lattice-shaped opening 17 exists between the steel plates.
In the crushing portion of the lower jaw 8, a number of crushing teeth 18 are planted facing the opening 17 of the upper jaw 3. The crushed concrete waste is pushed out from the lattice-shaped opening 17 of the upper jaw 3 without clogging. [0016] Rebar cutting blades 11a and 11b are fixedly provided behind the opposing portion (crushing portion) of the upper jaw 3 and the lower jaw 8, respectively. When the lower jaw 8 is closed, the cutting blades 11a and 11b are connected to each other. Can cut through the rebar. Reinforcing bars that protrude or bend from the concrete mass and obstruct the work are the cutting blades 11a and 1b.
The cutting is performed at 1b so that the crushing operation and the loading operation are performed smoothly. Below the hydraulic cylinder 9, a magnet 15 housed in a cylindrical protective case 14 is mounted downward by bolting its mounting plate 16 to the lower side 13 of the side plate of the frame. The coil of the magnet is connected to the battery of the power shovel via a switch provided in the driver's seat of the power shovel. The processing of concrete blocks and reinforcing bars after dismantling of a reinforced concrete building using the crusher is typically performed as follows. A crusher is attached to the tip of the arm of the power shovel, and the concrete mass piled up at the demolition site is crushed while cutting the reinforcing bars as appropriate, and then loaded into a dump truck. Further, the rebar left in a state sandwiched between the upper jaw and the lower jaw after crushing is loaded on another dump truck. Rebar scrap scattered at the work site when crushing concrete or cutting a reinforcing bar is adsorbed by appropriately energizing the magnet 15 and causing the magnet to approach the scattering site, and is loaded onto the dump truck carrier for transporting the reinforcing bar. By stopping the power supply to the magnet on the
Load.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a crusher according to an embodiment of the present invention, in which a magnet mounting portion is sectioned. FIG. 2 is a schematic plan view of an upper jaw of the crusher shown in FIG. FIG. 4 is an explanatory view showing a work state of a rebar scrap collecting operation by the crusher according to the present invention. FIG. 4 is an explanatory view showing a work state of a rebar scrap collecting operation using a conventional crusher. Upper jaw 4 Bracket 11 Rebar cutting blade 15 Magnet

Claims (1)

Claims: 1. A frame (2) integrally provided with an upper jaw (3) at an upper end thereof and having a base end swingably connected to an end of an arm of a power shovel; 2) pivoted to the upper jaw
(3) In a crusher of a power shovel provided with a lower jaw (8) for crushing a concrete mass and a magnet (15) for adsorbing a cut piece of a reinforcing bar, the magnet (15) is used for a frame (2). A crusher for a power shovel, which is mounted downward at a lower portion of a base end side.