JP2014080764A - Small-sized attachment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized attachment in which the number of components is decreased, and which is easy to be assembled and includes: a rotation mechanism of which the smooth rotation can be expected.SOLUTION: A small-sized attachment comprises: a drive mechanism section which is formed from a bracket for mounting to a work machine such as a power shovel and a hydraulic cylinder fixed to the bracket; a work mechanism section in which rear ends of two work arms including cutting blades in the front ends thereof are pivoted to a work arm support and which is configured by pivoting one end of a link mechanism for mounted in a distal end of a piston rod of the hydraulic cylinder for opening/closing the work arm to the intermediate part thereof; and a rotation mechanism section which is interposed between the drive mechanism section and the work mechanism section and formed from a ball bearing for connecting the drive mechanism section and the work mechanism section in a rotatable manner. The bracket and an outer casing of the hydraulic cylinder are fixed by welding or bolt fastening to any one of bracket mounting plates provided on top and side faces of the outer casing of the hydraulic cylinder.

Description

  The present invention relates to a small attachment that is attached to a working machine such as a power shovel to cut or crush steel or wood.

In a crushing device or cutter that is attached to a work machine such as a power shovel and crushes the structure and cuts steel materials, etc., a pair of arms with a crushing blade provided at the tip and pivotally attached to the work arm support is a hydraulic cylinder. It is configured to open and close. Conventionally, there are two hydraulic cylinders that are pivotally attached to both ends of the hydraulic cylinder mainly at the other end of each of the arm support and the pair of arms whose intermediate portions are pivotally attached to the arm support. The equipment is large and heavy, and there is a problem that it is difficult to work in a narrow place. Further, since the angle at which the crushing blade sandwiches the non-crushable material changes at any time, the arm support and a bracket for attaching the crusher and the cutter to the working machine such as the power shovel are configured to be rotatable, There were also problems based on the use of swivel joints and the installation of hydraulic hoses for supplying hydraulic pressure to the two hydraulic cylinders.
As a solution to the above problem, “the hydraulic cylinder is arranged perpendicular to the arm opening and closing direction, the outer cylinder of the hydraulic cylinder is fixed to the bracket in a non-rotatable manner, and the arm support is rotatable with respect to the bracket. The invention of the structure crushing apparatus attached to “A” is disclosed in Patent Document 1 (Japanese Patent No. 2554562).

Japanese Patent No. 2554562

The mechanism for rotatably mounting the arm support in the invention of Patent Document 1 is disclosed in paragraphs [0024] to [0026] and [0028] of the specification in “[0024] (hydraulic cylinder 4)”. An annular body 38 having a through-hole 36 and a stepped circumferential groove 37 and having an axially cross-sectional “L” shaped bush 35 fitted in the outer peripheral flange 35 of the outer cylinder 32, It is inserted from the non-cylinder head side.
[0025] The outer cylinder 32 in which the annular body 38 is inserted into the outer peripheral flange 35 is inserted into the annular body 27 of the working machine bracket 5 from the side opposite to the cylinder head. Further, during this insertion operation, the inner peripheral surface of the annular body 27 is inserted. The key 41 is fitted between the key groove 31 engraved on the key and the key groove 40 engraved on the outer peripheral surface of the outer cylinder 32 so that the outer cylinder 32 is against the annular body 27 of the work implement bracket 5. The outer cylinder 32 is made non-rotatable, and the female threads 42 and 43 are fastened to the male threads engraved on the outer periphery of the substantially central portion of the outer cylinder 32 so that the outer cylinder 32 is connected to the annular body 27 of the work implement bracket 5. Fixed so that it cannot move in the axial direction.
[0026] The female screw 43 is not for fastening the outer peripheral flange 35 of the outer cylinder 32, the bush 39, the annular body 38, and the annular body 27 of the working machine bracket 5 together in the axial direction. The female screw 43 is fixed in the axial position by a fastening force with the female screw 42, and holds the bush 39, the annular body 38, and the annular body 27 with a margin from the outer peripheral flange 35. Reference numeral 38 is rotatable with respect to the outer cylinder 32 and the work implement bracket 5.
[0028] A bush 46 equivalent to the bush 39 is fitted in the stepped circumferential groove 26 of the annular flange 11 of the arm support 6, and the annular flange 11 is fitted to the outer peripheral flange 35 of the outer cylinder 32 to form an annular shape. By fastening the outer peripheral portion of the body 38 and the outer peripheral portion of the annular flange 11 with bolts 47, the arm support 6 is attached to the work implement bracket 5 so as to be rotatable and immovable in the axial direction. ]
2 and collating with FIG. 2 of the drawing, the annular body 38 and the annular flange 11 of the arm support body are fitted and arranged above and below the outer peripheral flange 35 of the outer cylinder 32 of the cylinder 4. It is formed by fastening the outer peripheral portion with a bolt 47, and when fastening both, the axial position of the annular body 38 disposed on the outer peripheral flange 35 of the outer cylinder 32 of the cylinder 4 is fixed. An annular body 27 and female threads 42 and 43 for fixing the annular body 27 are provided, and an “L” -shaped bush is interposed between the outer cylinder 32 of the cylinder 4 and the annular body 38 and the annular body 11. I can understand that it is.
As described above, the mechanism for pivotally mounting the arm support according to the invention of Patent Document 1 has a large number of components and requires time for assembly, and the rotation is mainly performed outside the cylinder 4. Since the sliding is performed between the outer peripheral flange 35 of the cylinder 32 and the annular body 38 and the bush fitted inside the annular body 11, the smooth rotation may be impaired by the sliding resistance and wear with the bush. And there are problems such as the need for periodic replacement of the bush.
The present invention has been made in view of the above problems, and provides a small cutter device having a rotation mechanism that has a small number of components, is easy to assemble, and can be expected to rotate smoothly.

The present inventor has solved the above problems by the following means.
(1) A small attachment for crushing a structure attached to a work machine such as a power shovel,
A drive mechanism portion comprising a bracket for mounting on a work machine such as the power shovel, and a hydraulic cylinder having an outer cylinder fixed to the bracket;
Two working arms each having a cutting blade for cutting an object to be cut at the front end are pivotally attached at their rear ends to a work arm support, and are attached to the front end of a piston rod of the hydraulic cylinder at an intermediate portion. A working mechanism formed by pivotally attaching one end of a link mechanism that opens and closes;
A small attachment comprising: a rotation mechanism portion that is interposed between the drive mechanism portion and the work mechanism portion so that the work mechanism portion is rotatably connected to the drive mechanism portion.
(2) The rotating mechanism is a ball bearing in which an inner ring and an outer ring are fixed to a flange provided at a lower end of an outer cylinder of the hydraulic cylinder and an annular flange at an upper end of the working arm support. The small attachment according to the preceding item (1), characterized in that
(3) The work arm of the work mechanism section has a crushing blade for crushing the material to be crushed instead of the cutting blade, or a material for gripping, transporting and moving a material such as steel or wood. The small attachment according to item (1) or (2), wherein the small attachment has a gripping blade.
(4) The bracket is fixed to the outer cylinder of the hydraulic cylinder by welding, or a square bracket mounting plate welded to the upper part of the hydraulic cylinder, or a square bracket welded to the side surface via a rib The small attachment according to any one of (1) to (3), wherein the attachment plate is bolted to either one of the mounting plates.

The following effects can be exhibited by the small attachment of the present invention.
<1> A small attachment according to the present invention includes a drive mechanism unit including a bracket for mounting on a work machine such as the power shovel, and a hydraulic cylinder having an outer cylinder fixed to the bracket.
Two working arms each having a cutting blade for cutting a workpiece at the tip are pivotally attached to the arm support at the rear end, and are attached to the tip of the piston rod of the hydraulic cylinder at the middle to open and close the work arm. A working mechanism part pivotally attached to one end of the link mechanism,
The working mechanism unit is interposed between the driving mechanism unit and the working mechanism unit, and the working mechanism unit is connected to the driving mechanism unit so as to be pivotable.
The rotation mechanism is a ball bearing in which an inner ring and an outer ring are fixed to a flange provided at the lower end of the outer cylinder of the hydraulic cylinder and an annular flange at the upper end of the working arm support. Therefore, it is possible to provide a small attachment that is easy to assemble and that can be smoothly rotated over a long period of time.
<2> For the work arm of the work mechanism section having a crushing blade for crushing the material to be crushed, instead of the cutting blade, or holding and transporting and moving a material such as steel or wood A small attachment that has a gripping blade and can be adapted to various construction work can be provided.
<3> The bracket and the outer cylinder of the hydraulic cylinder are fixed by welding, a square bracket mounting plate welded to the top of the hydraulic cylinder, or a square bracket welded to the side surface via a rib. Since it is configured to be bolted to one of the mounting plates, especially in the latter case, the attachment position of the small attachment to the hydraulic cylinder can be changed according to the situation at the work site, and the space at the work site can be changed. And efficient cutting, crushing, or gripping operations can be performed.

The front view (a) which shows the state where the work arm of the small attachment of the present invention was opened, and the front view (b) of the state where the work arm was closed Front view (a) and side view (b) with the working arm closed Sectional view of rotating mechanism Front view of a small attachment with a bracket attached to the side of the cylinder

The form for implementing the small attachment of this invention is demonstrated based on the figure of an Example.
FIG. 1 is a front view showing a state in which the work arm of the small attachment of the present invention is opened, a front view in a state in which the work arm is closed, and FIG. 2 is a front view in a state in which the work arm is closed. (A) and side view (b), FIG. 3 is an enlarged cross-sectional view of the rotation mechanism, and FIG. 4 is a front view of a small attachment with a bracket attached to the side surface of the cylinder.
In the figure, 1 is a bracket, 2 is a hydraulic cylinder, 2a is a piston rod, 2b is a flange, 2c is an outer cylinder, 3 is a work arm, 3a is a cutting blade, 4 is a work arm support, 4a is an annular flange, and 5 is a link. Mechanism, 5a is a link arm, 5b is a connecting arm, 6 is a ball bearing, 6a is an inner ring, 6b is an outer ring, 7 is a link mechanism fixture, 8, 8 'are bolts, 20, 20' are bracket mounting plates, 21 is Bolts 22 are ribs.

The small attachment according to the present invention includes a drive mechanism unit including a bracket 1 for mounting on a work machine such as a power shovel, and a hydraulic cylinder 2 fixed to the bracket 1.
Two working arms 3 and 3 each having a cutting blade 3a for cutting an object to be cut at the tip are pivotally attached to the arm support 4 at their rear ends, and at the tip of the piston rod 2a of the hydraulic cylinder 2 at the middle. A working mechanism portion that is mounted and pivotally attached to one end of a link mechanism 5 that opens and closes the working arms 3 and 3;
The working mechanism is interposed between the driving mechanism and the working mechanism, and the working mechanism is configured to be pivotably connected to the driving mechanism.

In the embodiment shown in FIGS. 1 and 2, the bracket 1 and the hydraulic cylinder 2 are fixed to a square bracket welding plate 20 welded to the upper surface of the outer cylinder 2 c of the hydraulic cylinder 2. Although it is made by fastening at 21, this fixing does not prevent it from being made by welding as required.
Then, as shown in the cross-sectional view of FIG. 3, the rotating mechanism portion has an upper portion of the inner ring 6a of the ball bearing 6 fixed to a flange 2b provided at a lower end portion of the outer cylinder 2c of the hydraulic cylinder 2. The lower part of the outer ring 6b of the ball bearing 6 is fixed to an annular flange 4a provided at the upper end of the arm support 4.
In this embodiment, the working arms 3 and 3 are described as having cutting blades 3a. However, as can be seen in the matters described in claim 3, the working arms include crushing blades that crush the material to be crushed. Even if it has a gripping blade for gripping and transporting and moving materials such as steel and wood, it has the same structure except for the shape of the blade, and the cutting blade 3 is crushed What is necessary is just to read as a blade or a gripping blade.

Based on FIG.2 and FIG.3, the structure of the small attachment of this invention is demonstrated in detail.
a. As shown in FIG. 3, a flanged cylinder is fitted and fixed to the lower inner wall of the outer cylinder 2c of the hydraulic cylinder 2 to form a flange 2b on the outer cylinder 2c. The inner wall of the flanged cylinder has a smoothness that allows the piston rod 2a of the hydraulic cylinder 2 to enter and exit smoothly and freely rotate.
b. As shown in FIG. 3, the rotation mechanism portion is formed by a ball bearing 6 in which an inner ring 6 a and an outer ring 6 b have a step difference in the vertical direction.
c. In addition, as shown in FIG. 2, the working mechanism section has two working arms 3 and 3 each having a cutting blade 3a at the front end and two plate-like front and rear working arm supports 4 (side view). The ring arm 5a is pivotally attached to the middle part of the piston rod 2a of the hydraulic cylinder 2 at the center thereof by a link mechanism attachment 7 at the center thereof, and one end of each of the ring arms 5a is attached to both ends of the ring arm 5a. Is provided with a link mechanism 5 composed of two connecting arms 5b pivotally attached to the intermediate portion of the work arm 3 at the other end, thereby enabling the work arm 3 to be opened and closed.
In addition, the said connection arm is comprised by two plate-shaped bodies before and behind so that the said work arm 3 may be clamped (refer side view).
Further, an annular flange 4a for connecting to the rotating mechanism is provided at the upper end of the work arm support 4.
d. As shown in FIG. 3, the drive mechanism and the rotation mechanism are coupled to each other by connecting a flange 2 a formed on the outer cylinder 2 c of the hydraulic cylinder 2 and an inner ring 6 a of the ball bearing 6 of the rotation mechanism to a plurality of bolts 8. Is done by concluding in
Further, the rotating mechanism and the working mechanism are coupled by connecting the annular flange 4a provided at the upper end of the working arm support 4 and the outer ring 6b of the ball bearing 6 of the rotating mechanism with a plurality of bolts 8 '. Has been done.

The small attachment according to the present invention operates by attaching the bracket 1 to a working machine such as a power shovel and supplying hydraulic pressure to the hydraulic cylinder 2 from the working machine.
FIG. 1A shows a small attachment in a state where the piston rod 2a of the hydraulic cylinder 2 is pushed up into the outer cylinder 2c by the hydraulic pressure supplied to the lower part of the cylinder from the working machine and the cutting blade 3a of the work arm 3 is opened. Show.
In this state, when the workpiece is taken in between the two cutting blades and hydraulic pressure is applied from the top of the cylinder 2 to push down the piston rod 2a, the work arm 3 is moved by the link mechanism 5 attached to the tip of the piston rod 2a. Then, the pivoting shaft with the work arm support 4 is turned as a fulcrum, and the tip is rotated in the closing direction to cut the object to be cut by the cutting blade 3a at the tip.
Needless to say, when the work arm has a crushing blade, the crushing object is crushed, and when the work arm has a holding blade, the holding arm is held and moved and transported. Absent". FIG. 1B shows a small attachment with the work arm 3 closed.

When cutting an object to be cut with this small attachment, the object to be cut does not always exist perpendicular to the sliding surfaces of the two cutting blades 3a. In this case, since the cutting stress is applied to the object to be cut with an inclination angle, not only the cutting efficiency is lowered, but the object to be cut that is not fully cut can be cut into two cutting blades 3a. There is also a risk of being caught between the sliding surfaces. Therefore, when a rotating mechanism portion is interposed between the drive mechanism portion fixed to the work machine and the work mechanism portion having the work arm 3, when the two cutting blades 3a come into contact with the workpiece, the sliding surface The cutting mechanism is rotated together with the piston rod 2a so as to be orthogonal to the object to be cut, thereby constituting a working mechanism capable of performing a cutting work without causing the fear.
In addition, since the ball bearing 6 is used for the rotation mechanism, it can be smoothly rotated even by a slight difference in inclination angle between the object to be cut and the sliding surface of the cutting blade 3a. Can be provided.
Furthermore, since the hydraulic cylinder 2 is fixed to the bracket 1, a swivel joint is not required as compared with a conventional hydraulic cylinder provided between the arm support and the pair of working arms. Since the number of hydraulic cylinders has been reduced from two to one, the size and weight can be reduced, the production cost can be reduced, and problems such as wrapping of the hydraulic hose can be eliminated.

In the small attachment according to the present invention, the bracket 1 and the outer cylinder 2c of the hydraulic cylinder 2 are fixed to each other by welding or a rectangular bracket mounting plate 20 welded to the upper part of the hydraulic cylinder 2, or a rib 22 on the side surface. Since the bolts 21 are fastened to either one of the square bracket mounting plates 20 ′ welded via the above, in the latter case, the above-described use is made according to the situation at the work site. The bracket 1 is mounted by selecting one of the bracket mounting plates 20, 20 ′ on the upper surface or side surface of the hydraulic cylinder 2.
FIG. 4 shows a front view of the small attachment in a state in which the bracket 1 is attached to the bracket attachment plate 20 ′ welded to the side surface of the outer cylinder 2 c of the hydraulic cylinder 2 via the rib 22 with the bolt 21. In a work site where there is a structure or the like above and the use height of the arm of the work machine is limited, the use in this state is effective.

1: Bracket 2: Hydraulic cylinder 2a: Piston rod 2b: Flange 2c: Outer cylinder 3: Working arm 3a: Cutting / crushing blade 4: Working arm support 4a: Annular flange 5: Link mechanism 5a: Link arm 5b: Connecting arm 6: Ball bearing 6a: Inner ring 6b: Outer ring 7: Link mechanism attachment 8, 8 ': Bolt 20, 20': Bracket mounting plate 21: Bolt 22: Rib

Claims (4)

A small attachment for crushing a structure by attaching it to a work machine such as a power shovel,
A drive mechanism section comprising a bracket (1) for mounting on a work machine such as the power shovel, and a hydraulic cylinder (2) having an outer cylinder (2c) fixed to the bracket (1);
Two working arms (3, 3) each having a cutting blade (3a) for cutting an object to be cut at the front end are pivotally attached to the work arm support (4) at their rear ends, and the hydraulic cylinder ( 2) a working mechanism portion that is attached to the tip of the piston rod (2a) and that pivots on one end of a link mechanism (5) that opens and closes the working arm (3);
A small attachment comprising: a rotation mechanism portion that is interposed between the drive mechanism portion and the work mechanism portion so that the work mechanism portion is rotatably connected to the drive mechanism portion.   The rotating mechanism portion includes an inner ring on a flange (2b) provided at a lower end portion of an outer cylinder (2c) of the hydraulic cylinder (2) and an annular flange (4a) at an upper end portion of the work arm support (4). The small attachment according to claim 1, wherein the ball bearing (6) is fixed to the outer ring (6a).   The work arms (3, 3) of the work mechanism section have a crushing blade for crushing the material to be crushed, or a material such as steel or wood, instead of the cutting blade, and carry and move it. The small attachment according to claim 1, further comprising a gripping blade. The bracket (1) and the outer cylinder (2c) of the hydraulic cylinder (2) are fixed by welding or a square bracket mounting plate (20) welded to the upper part of the hydraulic cylinder, or a rib on the side surface. The small attachment according to any one of claims 1 to 3, wherein the attachment is made by tightening a bolt (21) to either one of the square bracket mounting plates (20 ') welded via.

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