JP2011116546A - Grapple bucket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grapple bucket having improved workability by reducing its planar-view area in the opened state without reducing its gripping capacity. <P>SOLUTION: A plurality of pawls 4 each having an inner face arcuate in the side view are mounted on a frame 2 in a closeable manner. The inner face of each pawl 4 is mounted with a blade 16 wider than the inner face of the pawl. The blades 16 each have a horizontal cross section shaped straight in the state that a shell is closed, the right and left ends of the adjacent blades neighbor each other or abut on each other. The blades 16 have cut-off portions 16b in both right and left ends. The cut-off portions 16b are each provided along a line parallel to a line between the front ends of the adjacent pawls in a planar view in the state that the shell is opened. Additional plates 18 are each provided with one arcuate side fixed along the cut-off portion 16b. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention includes, for example, a frame attached to an arm or the like of a work machine, a claw attached to the periphery of the frame so as to be openable and closable, and a wide blade welded to the arcuate inner surface of the claw (hereinafter referred to as a combination of the claw and the blade). And a blade structure suitable for a semi-sealed or sealed grapple bucket in which the distance between adjacent blades is small when the shell is closed.

  The grapple bucket is attached to the tip of a movable movable support such as an articulated arm of a work machine, and is used when unloading a load loaded on a truck bed or loading a load on a truck or the like. Such a grapple bucket includes a frame attached to the tip of an arm or the like, a plurality of claws attached to the periphery of the frame so as to be openable and closable, and blades wider than the claws and welded to the claws. And when the load | holding goods hold | gripped and conveyed with the shell comprised from a nail | claw and a blade | wing consist of a comparatively small particle-like thing like earth and sand, a metal grain, etc., it is disclosed by patent document 1, for example As described above, a semi-sealed or hermetically sealed grapple bucket is used in which the blades provided on the claws are wider than general ones, and the distance between adjacent blades is narrowed or eliminated when the shell is closed.

JP-A-7-53175

  In the device described in Patent Document 1, the vertical cross-sectional shape of each blade has an arc shape, the horizontal cross-sectional shape also has an arc shape, and the horizontal cross-sectional shape of an assembly of a plurality of blades in a closed state has a circular shape. It is composed. However, it is not easy in manufacturing to form both the vertical and horizontal cross-sectional shapes of the blades in an arc shape. In addition, if the horizontal cross-sectional shape of the blade is formed in an arc shape, the volume in a state where the shell is closed is smaller than the volume when the horizontal cross-sectional shape of the blade is formed linearly. For this reason, for the purpose of gripping and transporting a baggage having a granular shape, the horizontal cross-sectional shape of the blade is linear, and the horizontal cross-sectional shape of the blade assembly when the claws are closed is, for example, a quadrangular shape. It is preferable to configure the shell so as to form a polygon.

  However, if the horizontal cross-sectional shape of the blade assembly when the claws are closed forms a polygon such as a quadrangle, for example, in the case of a semi-sealed or sealed grapple bucket due to the presence of the blade. The area in plan view of the entire shell with the claws open is widened. For this reason, for example, in order to grip a load loaded on the truck bed, even if an attempt is made to grip the luggage by lowering the shell into the truck bed with the shell open, the shell area in the opened state is large. It becomes difficult to put the shell into the loading platform. In addition, if the shell is reduced in size to solve such problems, the volume of luggage that can be accommodated in the shell by a single gripping operation is reduced, resulting in poor work efficiency.

  In view of the above problems, the present invention provides a grapple bucket in which a wide blade is provided on the inner surface of a claw, and the grapple that does not reduce gripping capacity while reducing the area in plan view in an open state and improving workability. The purpose is to provide buckets.

The grapple bucket of claim 1
A frame attached to the movable support;
A plurality of claws attached to the frame so as to be openable and closable, and having an arcuate side view of the inner surface;
The blades attached to the inner surface of each of the claws, wherein the blades are wider than the inner surface of the claws and the shell is closed, the horizontal cross-sectional shape is linear, and the left and right ends of adjacent blades are close to each other or Abutting blades;
A missing portion provided on the left and right ends of the blade, and removed along a line parallel to the line connecting the tips of adjacent claws in a plan view with the shell open;
An additional plate having an arcuate side and fixed on the side along the cutout portion is provided.

The grapple bucket of claim 2 is the grapple bucket of claim 1,
The additional plate is characterized in that the shell is in a horizontal posture and is vertical in an open state.

The grapple bucket according to claim 3 is the grapple bucket according to claim 1 or 2,
A shell is formed by attaching four claws to the frame.

  According to the first aspect of the present invention, the left and right end portions of the blade in plan view with the shell opened are removed along a line parallel to the line connecting the tips of the claws. The area in plan view with the shell opened can be reduced. For this reason, in order to load or unload granular cargo loaded on the truck bed or transfer it to another means of transport, when the shell is opened and placed in the bed, it is easy to insert the shell into the bed and workability Will improve.

  In addition, since an additional plate is provided in the blade notch, the leakage of luggage from the shell in the process of closing the shell is prevented by this additional plate, and the capacity of the shell is increased despite the provision of the notch. There is almost no decrease. In other words, the size of the shell, including the size of the claws, had to be reduced in order to smoothly perform operations such as loading and unloading from the truck bed, but without reducing the size of the claws. A grapple bucket that can be smoothly loaded and unloaded can be provided. For this reason, it is possible to provide a grapple bucket capable of carrying out the cargo handling work efficiently without reducing the gripping capacity of the shell.

  In addition, the additional plate provided at the blade notch part moves toward the inside of the shell in the process of closing the shell, and the blade part provided with this additional plate has a straight edge of the blade and is in the shell closing direction. On the other hand, since the additional plate portion forms an acute angle, the resistance when gripping the load is reduced, and the gripping operation becomes smooth. In addition, since the additional plate serves as a reinforcing plate, the strength of the shell can be increased, and the weight of the shell can be reduced.

  According to the second aspect of the present invention, since the additional plate is configured to be vertical in a state where the shell is in a horizontal position and opened, the absence of the blade is parallel to the line connecting the tips of adjacent claws. Assuming a polygon composed of a line that includes a part of the part, the additional plate does not protrude outward from the polygon, and the area in plan view of the shell in a state where the shell is opened can be reduced. it can.

  According to the invention of claim 3, since the shell is constituted by four claws, the polygon is constituted by a line that is parallel to a line connecting between the tips of adjacent claws and includes a part of the blade lacking part. Becomes a quadrangle. This quadrilateral shape has a larger area reduction effect due to the provision of the cut-out part, compared to the pentagonal shape, and a gripping capacity suitable for a quadrangular cargo bed when unloading the cargo from the truck bed. A large shell can be constructed.

It is a perspective view which shows one Embodiment of the grapple bucket by this invention in a shell closed state. It is a side view which shows the grapple bucket of this Embodiment in a shell open state. It is a top view which shows the grapple bucket of this Embodiment in a shell open state. It is a bottom view which shows the grapple bucket of this Embodiment in a shell closed state. It is the perspective view which looked at the shell of the grapple bucket of this Embodiment from diagonally upward. It is the perspective view seen from diagonally upward as the state which opened the shell of this Embodiment. It is the perspective view seen from diagonally downward as the state which opened the shell of this Embodiment. It is the bottom view seen from the bottom as the state which opened the shell of this Embodiment. It is a top view which shows the state which made the grapple bucket of this Embodiment shell open, and was located on the loading platform of a truck. It is a horizontal sectional view showing a state during the shell closing operation of the grapple bucket of the present embodiment.

  1 is a perspective view showing an embodiment of the grapple bucket of the present invention in a closed state, FIG. 2 is a side view showing the grapple bucket in a shell open state, and FIG. 3 is a plan view showing the grapple bucket in a shell open state. It is. The grapple bucket includes an upper frame 1 attached to a movable support body of a working arm such as a hydraulic excavator (not shown), and a cylindrical lower frame 2 attached to the lower portion of the upper frame 1 with a structure described later. A plurality of brackets 3 provided around the lower frame 2 at equal intervals in the circumferential direction, a claw 4 having a hollow structure attached to each bracket 3, and being accommodated in each claw 4. The claw opening / closing hydraulic cylinder 5 (see FIG. 2) is provided. Although this embodiment shows an example in which four claws 4 are provided, the present invention can be applied to a grapple bucket in which 3 to 5 claws 4 are provided.

  The upper frame 1 has a turning device 8 for turning the lower frame 2 by a turning motor 6 (see FIG. 3), and a bracket 9 provided on the turning device 8, and the bracket 9 is a working arm or the like. A boss 10 for pinning a movable support (not shown) and a grapple bucket rotating hydraulic cylinder (not shown) attached to the movable support via a link (not shown). And a boss 11. Note that the grapple bucket of the present invention can be realized as a structure in which the grapple bucket is not attached to the movable support body so as to be rotatable by a hydraulic cylinder, but is suspended. Further, the hydraulic cylinder 5 may be attached to the upper portion of the claw 4 instead of the inside of the claw 4.

  Each bracket 3 has a box structure having left and right vertical plates and a top plate. The claw 4 has left and right side plates 4a having outer and inner edges formed in an arc shape, and outer surface plates 4b welded on both sides to the outer edges of these side plates 4a and 4a. These side plates 4a and outer plates 4b and the blade | wing 16 mentioned later comprise in a box shape. A lid 14 is attached to the side surface plate 4a and the outer surface plate 4b to be removed when the hydraulic cylinder 5 or the hydraulic piping is attached / detached or the inside is cleaned. The base part of the nail | claw 4 is externally fitted to each bracket 3, and the nail | claw 4 is rotatably attached by the pin 12 penetrated by the nail | claw 4 or the bracket 3. FIG. Further, one end portion of the hydraulic cylinder 5 is rotatably connected to the upper portion of the bracket 3 by a pin 13. The other end of the hydraulic cylinder 5 is connected to the side plates 4a and 4a by a pin 15 inserted into a boss provided on the side plate 4a.

  The blade 16 is attached to the inner edge of the side plate 4a by welding or the like. In order to realize this mounting structure, the blade 16 has an arcuate vertical cross-sectional shape and a linear cross-sectional shape. Each blade 16 is wider than the width of the claw 4, and the left and right ends of the blade 16 are welded with a structure protruding left and right from the side plate 4a. When the hydraulic cylinder 5 is contracted, the grapple bucket opens the claw 4, that is, the shell as shown in FIGS. 2 and 3. On the contrary, when the hydraulic cylinder 5 is extended, FIGS. 1, 4 (bottom view), As shown in FIG. 5 (perspective view), the pawl 4 or the shell can be closed. In a state where the shell is closed, the adjacent blades 16 and 16 are close to each other (semi-sealed type) or abutted (sealed type). Among these, the present invention is suitably applied to a sealed grapple bucket. Here, in order to express the degree of sealing numerically, when viewed from the lower surface with the shell closed as shown in FIG. 4, the horizontal width of the blade 16 (if the additional plate 18 is included, the additional plate 18 is included). When the width including the width of 18) is a and the distance between adjacent blades 16 and 16 (the gap when the gap is formed by the additional plates 18 and 18) is b, the shell to which the present invention is applied is It is preferable that a / (a + b) ≧ 0.8.

  6 to 8 are views of the claw 4 and the blade 16 viewed from various directions in a state where the claw 4 is opened. Among these drawings, FIG. 6 is a perspective view as viewed obliquely from above, FIG. 7 is a perspective view as viewed from obliquely below, and FIG. 8 is a view as viewed from below. As shown in these drawings, the claw 4 and the tip of the blade 16 are formed in a tapered shape so that the width in the inner and outer directions and the width in the left and right direction become narrower toward the tip. The blade 16 has a shape in which the width of the intermediate portion 16a is the widest.

  As shown in FIGS. 5 to 8, each vane 16 is provided with a notch 16b from the vicinity of the tip to the middle. As shown in FIG. 3, the notch 16 b of the blade 16 has a notch in the line 20 parallel to the line connecting the tips of the adjacent claws 4, 4 in a plan view with the claws 4 open. 16b is formed along. An additional plate 18 is welded to each notch 16b. That is, as shown in FIG. 6, the additional plate 18 has an arc shape in which the arc-shaped portion 18 a on one side matches the inner surface of the notched portion 16 b of the blade 16, and the arc-shaped portion 18 a extends along the inner surface of the notched portion 16 b. Fix by welding. The side 18b on the other side of the additional plate 18 is linear.

  As shown in FIG. 9, in the present embodiment, the additional plate 18 is welded so as to be vertical in a state where the grapple bucket is in a horizontal posture and the claw 4 is opened.

  In FIG. 3, 16c shows the area | region removed from the blade | wing of the conventional shell by this invention. That is, the structure with the region 16c added is a conventional blade structure. The length L1 of one side of the quadrangle surrounded by the line 20 in the case of providing the notch portion 16b is the left and right end portions of the blade 16 in the case of having the removed region 16c as in the conventional shell. It is shorter than the length L2 of one side of the quadrangle surrounded by the line 21 that connects them, and the area in plan view is narrowed.

  Therefore, as shown in the plan view of FIG. 9, when the shell is opened and put into the loading platform 23 in order to load or unload the granular load loaded on the loading platform 23 of the truck or to other transportation means, The shell can be easily inserted into the loading platform 23 and workability is improved.

  In other words, as shown in FIG. 9, when an operation such as holding and unloading a load from the loading platform 23 is performed from a state where the shell is opened, according to the conventional configuration, the shell including the size of the claw 4 and the blade 16 is included. Although the size has to be reduced, according to the configuration of the present embodiment, it is possible to provide a grapple bucket that can be smoothly loaded and unloaded without reducing the size of the claws 4 and the blades 16. For this reason, it is possible to increase the gripping capacity of the shell and to provide a grapple bucket that can efficiently carry out the cargo handling work.

  FIG. 10 shows the horizontal cross-sectional shape of the blade 16 during the operation of closing the shell of the present embodiment. When the blade 16 moves together with the claw 4 as shown by the arrow 24 in FIG. 10 as the shell is closed, the additional plate 18 is closer to the inner side of the shell, that is, makes an acute angle with the arrow 24. Leakage of luggage from inside the shell is prevented by this additional plate 18. For this reason, a load can be efficiently grasped.

  Further, the additional plate 18 provided in the notched portion 16b of the blade 16 is moved toward the inside of the shell in the process of closing the shell, and the blade 16 portion provided with the additional plate 18 has a straight edge at the blade 16; Further, since the portion of the additional plate 18 forms an acute angle with respect to the closing direction of the shell, the resistance when gripping the load is reduced, and the gripping operation becomes smooth. Further, since the additional plate 18 serves as a reinforcing plate, the strength of the shell can be increased, and the weight of the shell can be reduced.

  Further, in the present embodiment, as shown in FIGS. 2 and 3, the additional plate 18 is configured to be vertical as shown in FIGS. 7 and 8 when the shell is in a horizontal position and opened. Therefore, when assuming a polygon composed of a line 20 that is parallel to a line connecting the tips of adjacent claws and includes a portion 16b of the vane 16 in part, the additional plate 18 is external to the polygon. The area of the shell in plan view with the shell open can be reduced.

  In the present embodiment, since the shell is constituted by the four claws 4, the line 20 is parallel to the line connecting the tips of the adjacent claws 4 and 4 and includes the blade notch 16b in part. The polygon formed by becomes a quadrangle. For this reason, when the work is performed in a state where the four sides of the loading platform 23 of the truck having a quadrangular shape and the line 20 are parallel to each other, it is possible to work with a shell having a large gripping capacity. In addition, as the sealed grapple bucket, one having five claws 4 is also employed. However, when the number of claws 4 is four as in the present embodiment, the lacking portion 16b is provided. The area reduction effect is greater than in the case of a pentagon.

  When the present invention is implemented, various forms different from the above embodiments can be implemented. For example, the frame attached to the working arm or the like may be a vertically integrated frame that does not have the turning device 8. Further, the movable support for attaching the frame can be applied not only to the working arm but also to a grapple bucket having a structure in which the frame is attached to the movable support that moves along the rail, such as an overhead crane.

1: upper frame, 2: lower frame, 3: bracket, 4: claw, 5: hydraulic cylinder, 6: turning motor, 8: turning device, 9: bracket, 10, 11: boss, 12, 13, 15: pin 16: blade, 16a: intermediate part, 16b: missing part, 16c: removed area, 18: additional plate, 20: parallel line, 23: cargo bed

Claims (3)

A frame attached to the movable support;
A plurality of claws attached to the frame so as to be openable and closable, and having an arcuate side view of the inner surface;
The blades attached to the inner surface of each of the claws, wherein the blades are wider than the inner surface of the claws and the shell is closed, the horizontal cross-sectional shape is linear, and the left and right ends of adjacent blades are close to each other or Abutting blades;
Provided in the left and right ends of the blades, and in a plan view with the shell open, a notch portion removed along a line parallel to a line connecting the tips of adjacent claws;
A grapple bucket having an arcuate side and an additional plate fixed along the notch. The grapple bucket of claim 1,
The grapple bucket, wherein the additional plate has a vertical position when the shell is in a horizontal position and opened. The grapple bucket according to claim 1 or 2,
A grapple bucket characterized in that a shell is formed by attaching four claws to the frame.

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