KR100874372B1 - Crank preventing device of arm of shears - Google Patents

Abstract

A movable arm gap preventing apparatus of a hydraulic shear is provided to keep a sliding guide supporting a movable arm in close contact with the movable arm by moving the sliding guide toward the movable arm when the sliding guide is worn by friction. A movable arm gap preventing apparatus of a hydraulic shear which comprises a movable arm(3) which is pivotally mounted on a fixed body(2) by a fixing pin(4) inserted between leading ends(2a,2b) of the fixed body, a hydraulic cylinder(5) mounted on the back side, and a fixed blade(21) and a movable blade(31) which are replaceable comprises: a housing connecting part with female screw thread, a guide housing, a rectangular head unit(84) which is formed to be protruded, and a sliding guide(6).

Description

Crank preventing device of arm of shears}

1 is a front view of a small and medium hydraulic cutter of an embodiment for explaining the present invention

2 is a cross-sectional view taken along the line A-A of FIG.

Figure 3 is an exploded perspective view of the movable arm gap prevention device of the present invention

Figure 4 is a front view of a large hydraulic cutter of another embodiment of the present invention

5 is a cross-sectional view taken along the line B-B of FIG.

6 is a prior art

7 is a cross-sectional view of the prior art

※ Explanation of code for main part of drawing

1a: Medium and small hydraulic cutter 1b: Large hydraulic cutter

2: fixed body 2a, 2b: both ends

21: fixed blade 3: movable arm

31: movable blade 4: fixed pin

5: hydraulic cylinder 6: sliding guide

61 fastening screw hole 7 housing fastening portion

71: internal thread 8: guide housing

81: Male thread 82: Tightening bolt

83: through hole 84: square head

9: anti-rotation plate 91: anti-rotation hole

92: long hole 93: fixing bolt

Utility Model Registration No. 381253

The present invention is to cut the cutting object by preventing the movable arm to open when operating the movable arm of the hydraulic cutting machine (Shear) to remove the reinforcing steel or steel beams in the concrete when dismantling old reinforced concrete buildings or constructions The present invention relates to a movable arm spreading prevention device of a hydraulic cutter for smooth operation.

In general, an excavator, which is one of construction equipment, is equipped with a bucket for digging ground or moving soil or sand, a hydraulic breaker for breaking a rock, a hydraulic crusher for breaking a wall of a concrete building, and a hydraulic cutter. Can be used for multipurpose.

Excavators used for multi-purpose as described above are divided into large, medium, and small, the hydraulic cutter is used a large hydraulic cutter used for a large excavator and a medium, small hydraulic cutter used for medium and small excavators.

As shown in FIG. 6, the hydraulic cutter 100 of the prior art is rotatably assembled to the fixed body 101 by the movable arm 102 with the hinge pin 103 as the rotating shaft. A hydraulic cylinder 106 is installed between the hinge pin 103 and the flange 104 as a middle portion of the fixed body 101 so as to be rotatable using the turning cover 105 as a starting point. The front end of the piston rod 107 of the hydraulic cylinder 106 is connected to the connecting pin 108 at the rear end of the movable arm 102.

Therefore, when the hydraulic cylinder 106 is operated to move the piston rod 107 in and out, the movable arm 102 is configured to rotate with the hinge pin 103 as the starting point, and the fixed body 101 The flange 104 is equipped with a bulk cap 109 for connecting to the boom of the excavator, and the bulk cap 109 is mounted by a hydraulic rotating device (not shown) mounted inside the fixed body 101. It has a structure that can be rotated left and right by the rotating plate 110 to rotate left and right.

And the blade fixing fixtures 111 and 112 are formed at the front end of each of the fixed body 101 and the movable arm 102, and the fixed blade 113 and the movable blade to each of the blade holders 111 and 112 described above. 114 is replaceably mounted.

However, since the hydraulic arm 100 of the related art configured as described above has a structure in which the movable arm 102 rotatably assembled to the fixed body 101 is supported only by the hinge pin 103, cuts such as rebars In order to cut the water P, the cutting object P is placed between the fixed blade 113 and the movable blade 114, and then the movable arm 102 is rotated to the fixed blade 113 to operate. When the movable blade 114 is applied to the cutting object (P) when the cutting pressure as shown in FIG. 5, the movable blade 114 acts to open in the opposite direction of the fixed blade 113 by the reaction. In addition, the fixed blade 113 also acts to open in the opposite direction of the movable blade 114, which causes the movable arm 102 to open in the opposite direction of the fixed blade 113, thus appearing When the movable arm 102 cuts the cutting object P, a phenomenon occurs If the cutting object (P) is not cut smoothly as well as the phenomenon that the movable arm 102 twists the hinge pin (103), the cutting function of the hydraulic cutter (100) is significantly reduced, In addition, the service life of the hinge arm 103, the movable blade 114, etc., including the movable arm 102 is reduced.

Therefore, the applicant of the present invention has proposed Utility Model Registration No. 381253 in order to solve all the problems in the conventional hydraulic cutting machine as described above.

The above prior art is a fixed plate and a plurality of gap adjusting plate and reinforcing bush, etc. are installed in order to be detachably mounted on one side of the fixed body of the movable arm gap prevention device, and a fixed support pin for substantially supporting the movable arm It has been pointed out that the number of assembly parts and the structure is complicated because it has a structure to be mounted, in particular, the prior art has only one side of the movable arm because the movable arm gap prevention device is mounted only on one side of the fixed body. The problem is that it does not prevent the movable arm from opening more completely.

The present invention was created in order to solve the above-mentioned problems in the prior art and the prior art, a sliding guide for reducing the number of assembly parts of the movable arm spreading prevention device, simplifying the structure, and directly supporting the movable arm. When the sliding guide is worn by the friction action, the sliding guide is moved toward the movable arm so that the sliding guide can be maintained in close contact with the movable arm at all times, thereby cutting the movable arm such as rebar with a hydraulic cutter. The movable arm is formed on both sides of the fixed body according to the type of hydraulic cutter, for example, large and medium and small hydraulic cutters, while forming a movable arm gap preventing device on both sides of the fixed body. By installing the device to prevent the gap from happening, The invention has been invented for a different purpose in order to be able to prevent them all efficiently.

The present invention as a means for pursuing the above object,

A fixed arm, a movable arm rotatably mounted by a fixing pin while being sandwiched between both ends of the fixed body, and mounted inside the rear side of the fixed body to reciprocally rotate the movable arm within a predetermined angle range. In the large and medium and small hydraulic cutting machine having a hydraulic cylinder, and a fixed blade and a movable blade which is replaceably attached to each of the fixed body and the movable arm to cut the cutting object,

A housing fastening part in which female threads are formed at both front ends of the fixed body;

A guide housing having a male screw screwed to the housing fastening portion;

A square head portion protruding from the guide housing to one surface of the guide housing so that the guide housing can be screwed and unscrewed;

Each of the plurality of through-holes which are positioned inside each of the front end portions of the fixed body to support both sides of the movable arm at the same time and penetrate toward the opposite side around the square head of the guide housing. A sliding guide having a plurality of fastening screw holes through which fastening bolts to be inserted are screwed together;

Characterized in that consisting of.

In addition, the rotation is detachably attached to the outer side of each of the two front end with the anti-rotation hole is formed so as to expose each square head of the guide housings screwed to the housing fastening portion formed on each of the front end of the fixed body to prevent rotation Characterized in that it further comprises a prevention plate.

In addition, in the case of the small and medium hydraulic cutters, both sliding guides for rotatably supporting both sides of the movable arm are formed at positions where the installation positions are shifted from each other, and the movable blades of the movable arm are adjacent to each other. One side sliding guide attached to one end is formed at the position biased forward from the upper side higher than the hinge pin, the other side sliding guide formed at the other end of the fixed body is formed at the position biased back from the upper side higher than the hinge pin It features.

In addition, in the case of the large hydraulic cutter, both side sliding guides for rotatably supporting both sides of the movable arm are characterized in that they are attached to each other in the symmetrical state on the upper end of both sides of the fixed body higher than the hinge pin.

Hereinafter, each embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view of a medium and small hydraulic cutter of an embodiment for explaining the present invention, Figure 2 is a cross-sectional view taken along the line AA of Figure 1, Figure 3 is an exploded perspective view of the movable arm gap prevention device of the present invention, Figure 4 Is a front view of a large hydraulic cutter of another embodiment of the present invention, Figure 5 is a cross-sectional view taken along line BB of FIG.

Reference numeral 1a denotes a medium and small hydraulic cutter, and 1b denotes a large hydraulic cutter, and the medium, small and large hydraulic cutters 1a and 1b are shown in the drawings. The hydraulic cutter 1a is shown, and the figure of FIG. 4 shows the large hydraulic cutter 1b, and each of the small and medium hydraulic cutters 1a and the large hydraulic cutter 1b shown in the drawing is different from the difference in appearance. The movable blade 31 of the movable arm 3 when cutting the cutting object such as rebar by rotating the movable arm 3 rotatably mounted to the fixed body 2 as described later due to structural differences or the like. In order to prevent the movable arm 3 from spreading in order to prevent the phenomenon of opening in the opposite direction of the fixed blade 21 of the fixed body 2, both ends 2a and 2b of the fixed body 2 are prevented. ) Of each arm The value positions are not the same. Therefore, the configuration of the movable arm gap prevention device and the installation position of the movable arm gap prevention device according to the medium / small hydraulic cutter 1a and the large hydraulic cutter 1b will be described.

First, the embodiment of the movable arm spreading prevention device provided in the medium and small hydraulic cutter 1a is demonstrated.

The small and medium hydraulic cutter (1a) is a movable arm (3) inserted between the fixed body (2) and its front end (2a, 2b) is rotatably installed by a fixing pin (4), A hydraulic cylinder 5 for rotating the movable arm 3 is mounted inside the rear fixed body 2 of the fixing pin 4.

Each of the front end portions (2a) (2b) of the fixed body (2) is provided with a movable arm spreading prevention device for preventing the spreading of the movable arm (3), the movable arm spreading prevention device is a medium and small hydraulic cutting machine The movable arm 31 responds to the force that the movable blade 31 tries to open in the opposite direction of the fixed blade 21 when the cutting object is cut with a medium or small hydraulic cutter without significantly changing the structure of (1a). It is a device that can be made smoothly cutting operation of the cutting object by preventing the movable blade 31 from opening by preventing the movement).

To this end, each of the inner side of the two front end (2a) (2b) of the fixed body (2) is formed with a sliding guide (6), each of which is in close contact with the two sides of the movable arm (3) at the same time, the two front end (2a) Sliding guides 6 formed in each of the (2b) are to be formed in a position shifted from each other.

That is, the sliding guide 6 formed inside the one front end 2a of the fixed body 2 is in a biased front position biased forward from the upper side of the fixing pin 4 as shown in FIG. It is fixedly attached, and the sliding guide 6 formed inside the other end 2b of the fixed body is fixedly attached to a biased rearward position biased rearward from the upper side of the fixing pin 4.

The sliding guides 6 on both sides formed inside each of the front ends 2a and 2b of the fixed body 2 are formed in the housing fastening portion 7 formed to penetrate each of the front ends 2a and 2b. It is detachably attached to the guide housing 8 which is screwed to the female screw 71, and at the same time, the guide housing 8 enables forward movement toward the movable arm 3 from the inside of the two front ends 2a and 2b. Installed in a state. To this end, the outer circumferential surface of the guide housing 8 is formed with a male screw 81 which is screwed to the female screw 71 of the housing fastening portion 7 formed at each of the front end portions 2a and 2b. A plurality of through holes 83 through which the fastening bolts 82 penetrate are formed in 8, and the sliding guide 6 is formed at a position to be connected to the plurality of through holes 83. A plurality of fastening screw holes 61 in which the bolts 82 are screwed are formed.

In addition, a square head portion 84 protrudes from one surface of the guide housing 8 exposed to the outer surface of each of the two front ends 2a and 2b, and the square head portion 84 is formed using a tool such as a spanner. The guide housing 8 is screw-assembled to the housing fastening portion 7 in the direction of screwing and unscrewing, which is located inside each of the two front ends 2a and 2b to slide closely to support the movable arm 3. When the guide 6 is worn to some extent, and the movable arm 3 is not normally held in close contact, the square head 84 of the guide housing 8 is rotated in a screw tightening direction using a tool such as a spanner. In this case, the guide housing 8 moves toward the inside of each of the front ends 2a and 2b. As a result, the sliding guide 6 moves forward toward the movable arm 3 so that the movable arm 3 can be moved. Close support.

In addition, the movable arm gap prevention device of the present invention includes a housing fastening unit (eg, a housing housing) formed by mechanical vibration generated during operation of the hydraulic cutter by the guide housing 8 which closely supports the sliding guide 6 to the movable arm 3 as described above. The anti-rotation plate 9 is provided to prevent the screw from loosening in 7).

The anti-rotation plate 9 has an anti-rotation hole 91 for accommodating the square head 84 of the guide housing 8 in a state of being locked from rotation, and both ends 2a of the fixed body 2. (2b) a screw hole (23) for fixing the anti-rotation plate (9) in each, and the screw holes 23 formed in each of the two ends (2a) (2b) through the long hole (92) and the A fixing bolt 93 is provided to fix the anti-rotation plate 9 to each of the two front ends 2a and 2b.

Next, an embodiment of the movable arm spreading prevention device installed in the large hydraulic cutter 1b will be described.

Although the large hydraulic cutter 1b has an external and structural difference from the medium and small hydraulic cutters 1a described above, the same name and the same reference numerals as those of the medium and small hydraulic cutters are used for each component. Explain.

The large hydraulic cutter (1b) also has a movable arm (3) inserted between the fixed body (2) and its front end (2a) (2b) is rotatably assembled with a fixing pin (4), the fixing pin Inside the rear fixed body 2 of (4), a hydraulic cylinder 5 for rotating the movable arm 3 is mounted.

And the movable arm spreading prevention device installed in the large hydraulic cutter (1b) is formed to be symmetrical in the same position on both front ends (2a) (2b) of the fixed body (2) to closely support both sides of the movable arm (3) In this way, the movable arm spreading prevention device provided at each of the front end portions (2a) (2b) of the fixed body (2) of the large hydraulic cutter (1b) is described in the medium and small hydraulic cutter (1a) described above. It has the same structure as the one installed. Therefore, description of the movable arm spreading prevention device installed in the large hydraulic cutter 1b will be omitted.

On the other hand, the movable arm spreading prevention device of each embodiment configured as described above is a lubricating oil for reducing the frictional resistance between the sliding guide 6 and the movable arm 3 to be supported while directly in contact with both sides of the movable arm (3) In order to inject grease, the guide housing 8 is screw-assembled to detachably seal the inlet of the lubricant injection hole 85 and the lubricant injection hole 85 formed to be moved from the center of the square head 84 to the opposite side. A nipple 86 is provided, and a lubricating oil guide hole 62 is formed at the center of the sliding guide 6 to be connected to the lubricating oil injection hole 85.

The operation of the present invention configured as described above will be described.

First, the operation of the movable arm 3 to open when cutting the object to be cut by the medium and small hydraulic cutter 1a, is attached to the fixed body 2 of the medium and small hydraulic cutter 1a. Phenomena in which the movable blade 31 is opened to the opposite side of the fixed blade 21 when the movable blade 31 applies cutting pressure to the cutting object by rotating the movable arm 3 toward the fixed blade 21. In this case, the movable arm 3 is fixed to the front end side of the movable arm 3 to which the movable blade 31 is applied, which applies cutting force directly to the cutting object when viewed based on the fixing pin 4 of FIG. 1. On the other hand, the phenomenon that is going to be opened to the opposite side of the blade 21 is shown, while the rear end side of the movable pin 3 is to be opened to be opposite to the front side.

For this reason, in the present invention, the movable arm spreading prevention device is attached to each of the front end portions 2a and 2b of the fixed body 2 of the small and medium hydraulic cutter 1a, and the both end portions 2a and 2b. The movable arm spreading prevention device installed at the one end 2a adjacent to the movable blade 31 of the movable arm 3 is such that the front end of the movable arm 3 does not open in the opposite direction to the fixed blade 21. The support arm is installed in a state in which it is positioned in front of the fixing pin 4 as shown in FIG. 1, and the movable arm gap preventing device installed at the other end 2b is formed of the fixing pin 4. It is installed to be located in the rear.

Therefore, the sliding guide 6 of the movable arm spreading prevention device mounted on the one end 2a of the fixed body during the cutting operation of the cutting object by the medium and small hydraulic cutter 1a is in close contact with the front end of the movable arm 3. By supporting it, the front end side of the movable arm 3 does not open in the opposite direction to the fixed blade 21, and on the contrary, the sliding guide 6 of the movable arm gap preventing device mounted on the other end 2b is movable. By supporting the rear end side of the arm 3 closely, the rear end side of the movable arm 3 is supported so as not to open in the opposite direction of the movable blade 31, and thus the movable arm 3 is cut to the cutting object. In operation, the cutting object is smoothly cut in a state in which neither side is biased between the two ends (2a) and (2b) of the fixed body (2). Thus, the movable arm (3) is fixed at the fixing pin (4). Fixed by normal rotation (4) it will be a twisting action does not occur.

In addition, the large hydraulic cutter 1b is installed to be symmetrical at the same position on each of the front end portions 2a and 2b of the fixed body 2 by the movable arm gap preventing device due to its structural features. When cutting water, both sides of the movable arm 3 are held in close contact at the same time, thereby preventing the movable arm 3 from spreading.

On the other hand, the sliding guide 6 of the movable arm gap prevention device installed in each of the small, medium and large hydraulic cutters (1a) (1b) configured as described above on each of the front end (2a) (2b) of the fixed body (2) is The hydraulic cutters (1a) and (1b) described above are mounted inside each of the two front ends (2a) and (2b) so as to support both sides of the movable arm (3) in close contact with each other and to allow the rotation operation of the movable arm (3). Each time the movable arm 3 is rotated to cut the cutting object, the movable arm 3 and the sliding guide 6 are frictionally generated, and the movable arm 3 has excellent strength. While made of steel, the sliding guide 6 is made of brass. Therefore, the wear phenomenon generated when the movable arm 3 is rotated is displayed on the sliding guide 6.

Accordingly, the sliding guides 6 closely supporting the movable arms 3 so that the movable arms 3 do not open during the cutting operation of the cutting object by using the hydraulic cutters 1a and 1b described above. When a fine play occurs in the movable arm 3, the operator unscrews the fixing bolt 93 to which the anti-rotation plate 9 is attached. After separating and relaxing at (84) and then rotating the square head 84 in the screw tightening direction using a tool such as a spanner, the guide housing 8 rotates in the screw tightening direction at the housing fastening portion 7, respectively. The inside of the tip 2a, 2b is moved, and accordingly, the sliding guide 6 can be moved forward toward the movable arm 3 so that the worn sliding guide 6 is returned to the movable arm 3 again. To be able to hold on both sides As the sliding guide 6 is worn as described above, the movable guide of the present invention is prevented by rotating the guide housing 8 in the screw tightening direction to move the sliding guide 6 toward the movable arm 3. The device will always be able to closely support both sides of the movable arm (3).

The movable arm spreading prevention device of the present invention configured as described above is applicable to the medium, small and large hydraulic cutting machine because it can be applied in the same structure only in different installation positions at both ends of the fixed body of each of the small, medium and large hydraulic cutting machines. It provides the effect of making it possible to use it independently, and by supporting both sides of the movable arm at the same time, it can not only prevent the movable arm from opening, but also prevent the twisting of the fixing pin and the sliding guide. Is worn to some extent, the sliding guide can be moved forward by rotating the guide housing in a screw tightening direction to closely support both sides of the movable arm, thereby providing advantages such as extending the service life of the sliding guide.

Claims (4)

A movable arm 3 rotatably mounted by the fixing pin 4 while being sandwiched between the fixed body 2 and the two ends 2a and 2b of the fixed body, and the movable arm within a certain angle range. A hydraulic cylinder (5) mounted inside the rear side of the fixed body (2) and reciprocally rotated at each of the fixed body (2) and the movable arm (3) to be interchangeably attached to cut the cutting object. In the hydraulic cutting machine (1a) (1b) having the fixed blade 21 and the movable blade 31 to be A housing fastening portion 7 having female threads 71 formed on each of the front end portions 2a and 2b of the fixed body 2; A guide housing (8) having a male screw (81) screwed to the housing fastening portion (7); A square head 84 formed to protrude on one surface of the guide housing 8 so that the guide housing 8 can be screwed and unscrewed to the housing fastening portion 7; Located inside each of the front ends (2a) and (2b) of the fixed body (2) is installed to support both sides of the movable arm (3) at the same time, around the square head 84 of the guide housing (8) The sliding guide (6) is formed with a plurality of fastening screw holes 61 for screwing the fastening bolts 82 inserted through each of the plurality of through holes (83) formed in a state penetrating toward the opposite side in the ); Operation arm gaping prevention device of the hydraulic cutter, characterized in that the configuration. The method of claim 1, Rotation prevention to prevent the respective square heads 84 of the guide housings 8 screwed to the housing fastening portions 7 formed at each of the front end portions 2a and 2b of the fixed body 2 from being rotated. The ball (91) is formed with a movable arm gap prevention device of the hydraulic cutter, characterized in that it further comprises a rotation preventing plate (9) detachably attached to the outer side of each of the two front ends (2a) (2b). The method of claim 1, The hydraulic cutter 1a is formed at a position where the installation positions of the two sliding guides 6 for rotatably supporting both sides of the movable arm 3 are shifted from each other, and the movable blade 3 of the movable arm 3 One side sliding guide 6 attached to one side tip 2a of the adjacent fixed body 2 is formed at a position biased forward from the upper side of the fixed pin 4, and the fixed body 2 The other side sliding guide (6) formed on the other end (2b) of the movable arm of the hydraulic cutter, characterized in that formed in a position biased toward the rear from the upper side of the fixing pin (4). The method of claim 1, The hydraulic cutter 1b has both side ends 2a of the fixed body 2 having two sliding guides 6 formed on an upper side of the fixing pin 4 for rotatably supporting both sides of the movable arm 3. (2b) in the symmetrical state of the movable arm of the hydraulic cutter, characterized in that attached to each other.

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