JPH04193413A - Cut-off device for metal material and the like - Google Patents

Abstract

PURPOSE:To enable pressingly contact of movable jaws without a particular device to prevent a press-contact device to be caught with crushed object by pressing a movable jaw side edge part fitted with a movable cutting edge against the cutting edge side of a fixed jaw through pressing force of a press-contact means provided on the opposing part of a movable cutting edge fitting part. CONSTITUTION:One part of hydraulic oil of a hydraulic cylinder actuating to bite together movable jaws 13 is supplied to a hydraulic cylinder 17 through a hydraulic oil circuit 20. Hereby, the rod 17a of the cylinder 17 presses a pressure receiving part 13a. This pressing force is transmitted to the movable jaw 13 side as rotational moving moment around a rotating shaft 14 as a supporting point. Therefore, the pressing force P1 of the cylinder 17 is transmitted as pressing force P2 to press a movable cutting edge 15 against a fixed cutting edge 16 side. Hereby, good cutting can be always performed, because clearance is not generated between the movable cutting edge 15 and the fixed cutting edge 16 regardless of wear of the cutting edges 15, 16. When high oil pressure is needed due to large thickness of a cutting object, the pressing force P2 automatically becomes correspondingly high, and cuts it while pressing stronger.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for cutting metal materials, etc., and particularly for cutting metal waste materials such as reinforcing bars and metal plates generated when dismantling concrete structures etc. This invention relates to a cutting device suitable for cutting.

[Conventional technology]

2. Description of the Related Art A crusher having a fixed jaw and a movable jaw that engages with the fixed jaw is used as one of the devices for dismantling concrete structures such as buildings and concrete chimneys. This type of shredding machine can handle metal plates generated during demolition processing,
In order to cut the reinforcing bars exposed by crushing concrete, many have blades attached to the base of both jaws for cutting these metal materials.

FIG. 6 shows an example of this type of crusher.

1 is a fixed jaw, 2 is a movable jaw rotatably attached to the fixed jaw 1 via a shaft 3, and 4 is a hydraulic cylinder for opening and closing the movable jaw 2. This crusher is attached to an arm of a construction machine by a bracket part 1a, and by operating a movable jaw 2, the fixed jaw 1 and the movable jaw 2 crush objects to be crushed.

Next, reference numeral 5 is a blade attached to the base of the movable jaw 2, and reference numeral 6 is a blade attached to the base of the fixed jaw 1 so as to face this blade 5. By engaging these blades 5 and 6, the object is cut. Note that these blades are provided only on one side of the fixed jaws 1 and 2 so that the object can be cut to any desired length. By configuring the crusher in this manner, the blades 5 and 6 are used to appropriately cut exposed reinforcing bars and the like when crushing the object.

[Problem to be solved by the invention]

When the crusher with the above-mentioned configuration is used to cut reinforcing bars etc. for a long time, these blades 5 and 6 gradually wear out.
A gap is created between the two, making it difficult to cut the object, or in extreme cases, the object gets caught in the gap, making it difficult to open and close the jaw.

For this reason, a pressurizing mechanism as shown in FIG. 5 has been proposed.

Reference numeral 7 in the figure indicates a pressurizing means for the blade 5 attached to the movable jaw 2 side. This pressurizing means 7 consists of a casing 7a protruding from the inside of the movable jaw 2, and a plate spring 7b, which is the main body of the pressurizing means, disposed inside the casing a, and utilizes the elastic force of the plate spring 7b. The blade 5 is brought into pressure contact with the blade 6 side of the fixed jaw 1. This allows double-edged blades 5 and 6
Even if the blade 5 is worn out, the blade 5 is always pressed against the blade 6 side, and no gap is created between the two, so that good cutting can be expected at all times.

A structure has also been proposed in which a hydraulic cylinder is provided as a pressure means in place of the leaf spring at the portion where the leaf spring is arranged.

Although the above-described configuration has the above-mentioned advantages, the following problems have also been pointed out, and solutions to these problems are desired.

First, since a large casing 7a is protruded inside the fixed jaw 2, it often happens that crushed objects such as concrete pieces get caught in the casing area.

Further, due to its nature, the leaf spring 7a applies a preset elastic force to the blade 5.
is pressed all the time, so the pressing force cannot be changed as appropriate during cutting. For this reason, when cutting a thin steel plate, etc., the pressure force of the blade 5 may be unnecessarily large (or, conversely, when cutting a thick material, there is a risk that the pressure force may be insufficient. If the structure is such that the blade is pressed using the blade, the pressing force of the blade 5 can be adjusted, but the operator must set the pressing force in which case and how much.This setting work This method is very troublesome and requires skill, so it is not practical to adjust the pressure force, and in reality there is no advantage to using hydraulic pressure.For these reasons, only the device using the leaf spring has been put into practical use. ing.

[Means to solve the problem]

The present invention has been constructed in view of the problems of the prior art shown above.
This device is configured such that a pressure contact means is provided at a portion substantially opposite to the attachment portion of the blade, and the pressing force of the pressure contact means presses the movable jaw side edge to which the blade is attached to the blade side of the fixed jaw. Further, if necessary, the hydraulic pressure of the pressing means is made the same as the hydraulic pressure supplied to the hydraulic means for rotating the movable jaw.

[Effect]

The pressing means, which is placed at a portion substantially opposite to the blade attachment part around the rotation axis that supports the movable jaw, uses its pressing force to fix the side edge of the movable jaw to which the blade is attached, using the rotation axis as a fulcrum. Press against the blade side of the jaw. At this time, by guiding a part of the hydraulic pressure supplied to the hydraulic means for rotating the movable jaw to this hydraulic means, the operation of the movable jaw and the pressing force of the blade are linked. In other words, if a large amount of hydraulic pressure is required for cutting due to the thickness of the object being cut, the hydraulic pressure applied to the pressing means will be correspondingly large, and the blade of the movable jaw will be pressed more strongly against the blade of the fixed jaw. do. On the other hand, when a large hydraulic pressure is not required for cutting, such as when cutting a thin object, the pressing force of the blade of the movable jaw is correspondingly small.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings.

In FIGS. 1 to 3, reference numeral 10 denotes a fixed jaw formed in connection with the crusher main body 11, and 12 denotes a bracket formed in connection with the main body 11 at the end opposite to the fixed jaw forming part. .

Reference numeral 13 denotes a movable jaw that is rotatably supported on the rotary shaft load 4 and is attached to the crusher main body 11 having a fixed jaw 10. A blade (hereinafter referred to as "movable blade") 15 for cutting reinforcing steel etc. is attached to one example of the base of the movable jaw 13, while a blade 15 facing the movable blade 15 is attached to one side of the base of the fixed jaw 10. Another blade (hereinafter referred to as a "fixed blade") 16 is attached to the position. Also, 18 is connected culm 1
9 is a hydraulic cylinder for rotating the movable jaw 13.

Next, FIG. 3 shows details of the bearing part of the movable jaw 13. In the movable jaw 13, a pressure-receiving portion 13 is formed at a portion of the movable jaw 13 that forms a bearing 13' through which the rotary shaft 14 is inserted, and is centered at a position that almost faces the mounting portion of the movable blade 15, with the rotary shaft 14 interposed therebetween.
a is formed in a substantially semicircular shape.

Reference numeral 17 denotes a hydraulic cylinder whose main body is fixed to the fixed jaw 10 and serves as a pressing means.As shown in FIG.
The rod 17a is inserted into the opening 1'O formed in the fixed jaw 10.
a is inserted so that its tip contacts the pressure receiving portion 13a and presses the pressure receiving portion 13a. In addition, at a position corresponding to the locus of the rod 17a formed relative to the pressure receiving part 13a by the rotation of the movable jaw 13,
(20) A groove 13b is formed in the pressure receiving portion 13a, and the tip portion of the rod 17a is positioned within this groove 13b. Further, a lubricant such as grease is applied within the groove 13b to ensure smooth sliding movement with the tip of the rod 17a.

Next, the hydraulic cylinder 17 is supplied with part of the hydraulic pressure of the hydraulic cylinder 18 for operating the movable jaw by a hydraulic circuit 20. Further, this hydraulic circuit 20 is provided with a valve 21, and the opening/closing operation of this valve can be controlled from the driver's seat for operating the crusher.

In the above configuration, the hydraulic cylinder 18 operates to engage the movable jaws 13 when cutting reinforcing bars, iron plates, etc.
A portion of the hydraulic fluid passes through the hydraulic circuit 20 to the hydraulic cylinder 17.
supplied to As a result, the rod 1 of the hydraulic cylinder 17
7a presses the pressure receiving portion 13a. This pressing force is transmitted to the movable jaw 13 side as a rotation moment about the rotation shaft 14 as a fulcrum. As a result, the hydraulic cylinder 17 as shown in FIG.
The pressing force P1 is transmitted as a pressing force P2 that presses the movable blade 15 against the fixed blade 16 side. Therefore, regardless of the degree of wear of the movable blade 15 and the fixed blade 16, no gap is created between the movable blade 15 and the fixed blade 16, and it is possible to perform good cutting at all times.

Moreover, the hydraulic cylinder 17 is a hydraulic cylinder 18 for movable jaw operation.
By sharing the hydraulic pressure with the press force P2, this pressure contact force P2 corresponds to the hydraulic pressure when cutting the object. That is, if a large hydraulic pressure is required for cutting due to the thickness of the object to be cut, etc., the pressing force P2 will automatically increase accordingly, and the movable blade 15 will be pressed more strongly against the fixed blade 16 side. to effectively cut the object. On the other hand, when a large hydraulic pressure is not required for cutting, such as when cutting a thin object, the pressing force P2 of the movable blade 15 is correspondingly reduced, and an unnecessarily large pressing force is not applied.

Note that when only the crushing work is performed and no cutting work is performed, the hydraulic cylinder 17 is prevented from operating by closing the valve 21 of the hydraulic circuit 20.

Valve operation at this time can be performed extremely easily by button operation on a construction machine equipped with a crusher.

FIG. 4 shows another embodiment.

In this embodiment, a hydraulic cylinder 17 serving as a pressing means is attached to the inner side wall surface of the fixed jaw 10. That is, the main body of the hydraulic cylinder 17 is attached to the inner side wall surface 10b of the fixed jaw 10 that faces the movable jaw 13. This hydraulic cylinder 17 has a large internal piston diameter in order to generate a large pressing force with a short stroke. Incidentally, the stroke required to generate an appropriate pressure contact force against the movable blade 15 is in millimeters, or at most 1
It is extremely small, about 2 cm.

Therefore, the entire hydraulic cylinder 17 can be configured to have a flat shape with a small stroke, and can be sufficiently accommodated in the space. In the illustrated configuration, the movable jaw 1
The pressure receiving part 13a of 3 is moved inward than the configuration shown in FIG. There is no need to displace the pressure receiving part 13a if there is sufficient space to accommodate it.

In this embodiment, the hydraulic cylinder does not protrude outside the fixed jaw, and the inner wall surface 10b of the movable jaw 10 receives the reaction force applied to the hydraulic cylinder 17 when the pressure receiving part 13a is pressed by the rod 17a. There are advantages such as a large strength margin for the attachment portion of the hydraulic cylinder 17 to the hydraulic cylinder 17.

Although the present invention has been described above using a crusher for crushing concrete structures and the like as an example, it is of course possible to configure the present invention as a pure cutting device intended only for cutting.

〔effect〕

As specifically explained above, the present invention provides a pressure contact means using hydraulic pressure at a part substantially opposite to the attachment part of the movable blade around the rotation shaft that supports the movable jaw, and the pressing force of this pressure contact means Since the movable jaw side edge with the movable blade attached is configured to press against the blade side of the fixed jaw, it is possible to press the movable jaw without attaching a special device to the movable jaw side, and prevents debris from coming into contact with the pressure welding device. No problems such as getting caught.

In addition, by making the hydraulic pressure of the pressure contact means the same as the hydraulic pressure supplied to the hydraulic pressure means for rotating the movable jaw, the pressure contact force of the movable blade can be automatically adjusted in accordance with the force required for cutting.
There is no need to perform separate control to adjust the pressure contact force.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention, in which FIG. 1 is a side view of a device for cutting metal materials, etc., FIG. 2 is a partially cutaway front partial view of the device shown in FIG. 1, and FIG. 3 is a rotation of a movable jaw. A perspective partial view centered on the shaft portion, FIG. 4 is a partially cutaway front partial view of a cutting device for metal materials, etc. showing a second embodiment, and FIG. 5 is a part of the cutting device showing a conventional movable blade pressure welding means. 6 is a perspective view of the concrete crushing device. 10... Fixed jaw 13... Movable jaw 13'... Bearing 13a (of the movable jaw)... Pressure receiving part 14... Rotating shaft 15... Movable blade 16... Fixed blade 17...・Hydraulic cylinder 18 for pressing the pressure receiving part ・Hydraulic cylinder 20 for movable jaw operation ・Hydraulic circuit

Claims (4)

[Claims] (1) a fixed jaw, a movable jaw rotatably supported on the fixed jaw by a rotation shaft, a hydraulic cylinder for driving the movable jaw, a fixed blade attached to the fixed jaw; and a movable blade attached to a movable jaw, a pressing means is provided on the movable jaw at a position substantially opposite to the movable blade attachment part with the rotation axis in between, and the pressing means causes the rotation axis to be a fulcrum. A cutting device for metal materials, etc., characterized in that the movable blade is pressed against the fixed blade side. (2) By using a hydraulic cylinder as the pressing means and by connecting the hydraulic cylinder serving as the pressing means and the hydraulic cylinder for movable jaw driving through a hydraulic circuit, the hydraulic pressure for driving the movable jaw and the hydraulic pressure for pressing the movable blade are shared. 2. The apparatus for cutting metal materials, etc. according to claim 1. (3) Attach a movable blade to one side of the base of the movable jaw, form a pressure-receiving part for the movable jaw at a position that is almost opposite to the movable blade attachment part across the bearing through which the rotating shaft is inserted, and 3. The apparatus for cutting metal materials, etc. according to claim 1 or 2, wherein a rod of a hydraulic cylinder inserted through the pressure-receiving part presses the pressure-receiving part. (4) A hydraulic cylinder is arranged in the space between the inner wall of the fixed jaw and the pressure receiving part of the movable jaw, so that the reaction force applied to the hydraulic cylinder by the pressure of the pressure receiving part is received by the inner wall of the fixed jaw. An apparatus for cutting metal materials, etc. according to claim 1 or 2.