JP4329245B2 - Box-shaped cross-section structure and work attachment applied to work attachments for construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a box-shaped cross-sectional structure mainly applied to a work attachment of a construction machine such as a hydraulic excavator and a work attachment to which the box-shaped cross-sectional structure is applied.
[0002]
[Prior art]
FIG. 6 shows a hydraulic excavator that is called an in-vehicle-width turning type excavator. In the figure, 1 is an in-vehicle turning excavator, 2 is a lower traveling body, 3 is an upper turning body, 4 is a work attachment, 5 is a proximal boom, 6 is an offset boom, 7 is a front boom, 8 is an arm, 9 is Buckets, 10 are boom cylinders, 11 is an offset cylinder pivotally supported by the proximal boom 5 and the offset boom 6, 12 is a link rod pivotally supported by the proximal boom 5 and the front boom 7, 13 is an arm cylinder, and 14 is A bucket cylinder 15 is a proximal-side offset pivot shaft, and 16 is a front-side offset pivot shaft. In the in-vehicle swivel excavator 1 as shown in the figure, the boom cylinder 10, the arm cylinder 13, and the bucket cylinder 14 rotate the work attachment 4 in the front-rear (vertical) direction, as well as the proximal boom 5, the offset boom 6, By operating a four-bar link composed of the front boom 7 and the link rod 12 by the offset cylinder 11, the front-rear direction center line of the arm 8 (front boom 7) is set with respect to the front-rear direction center line of the proximal boom 5. It is possible to offset the movement in parallel.
[0003]
[Problems to be solved by the invention]
FIG. 7 is a view of the work attachment 4 of FIG. 6 as viewed from the opposite side. Since the offset cylinder 11 and the link rod 12 are collectively arranged on the left side in the longitudinal direction of the machine in the in-vehicle turning type excavator 1, nothing is arranged on the right side of the offset boom. When excavating a side groove on the right side of the fuselage with this type of in-vehicle swivel excavator 1, the offset cylinder 11 and the link rod 12 are arranged on the left side of the visible offset boom 6 so that the excavated groove wall, dredging, etc. Although there is a low risk of damage caused by contact with the offset cylinder 11 or the link rod 12, the right side surface portion of the offset boom 6 may come into contact with the excavated groove wall or the like, and may be damaged. On the side of the offset boom 6, there are many cases where a company name or the like is written, and there is a problem that this cannot be read.
[0004]
FIG. 8 is a view showing a CC cross section of FIG. In the figure, 6a is an offset boom, 20 is an upper plate, 21 is a lower plate, 22 and 23 are side plates, and a box-shaped cross section is formed by welding the upper plate 20, the lower plate 21, and the side plates 22 and 23. Yes. According to this offset boom 6a, since both side edges of the upper plate 20 and the lower plate 21 protrude laterally from the side plates 22 and 23, the side plates 22 and 23 are brought into contact with obstacles such as groove walls to some extent. Although it can be prevented, troubles such as positioning during welding, temporary assembly, and welding work occur in the production process.
[0005]
In order to solve this problem, like the offset boom 6b shown in FIG. 9 (corresponding to the CC cross section in FIG. 6), the upper plate 25, the side plate 26, and the lower plate 27 are joined together by bending the plate material. It has been considered to have a body shape and a U-shape in cross section. However, according to this, since the side plate 28 is inserted between the upper plate 25 and the lower plate 27, dimensional accuracy is required for bending.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, the first component member and the second component member, each of which has an L-shaped cross section, are joined so that the inner angles thereof face each other, and the first component member or the second component member One end edge protruded to the side. According to this, since the protruded edge part contacts an obstacle, such as a groove wall, it can prevent that a side part contacts and is damaged. Moreover, since it is a combination of L-shapes, a slight margin can be obtained in the dimensional system, and the production efficiency can be improved.
[0007]
According to a second aspect of the present invention, the first component member is formed by bending a thick plate material than the second component member, and one end edge of the first component member protrudes laterally. As a result, the high-strength, thick first constituent member protrudes laterally, so that damage when contacting with an obstacle such as a groove wall can be reduced. Moreover, since the second component member can be made thinner than the first component member, an increase in weight can be suppressed.
[0008]
According to a third aspect of the present invention, in the case where the one end edge of the first component member protrudes laterally and the second component member protrudes to the other side, The edge does not appear on the upper surface of the box-shaped cross-sectional structure, and the aesthetic appearance in the top view can be improved. Moreover, since unevenness does not occur on the upper surface, the retention of rainwater can be prevented.
[0009]
According to a fourth aspect of the present invention, there is provided a work attachment attached to an upper swing body that is pivotably connected to the lower traveling body so as to swing up and down, and the work attachment swings on the upper swing body. A proximal boom that is movably coupled; an offset boom that is pivotably coupled to the distal end of the proximal boom; a front boom that is pivotably coupled to the distal end of the offset boom; and the front An arm connected to the boom so as to be swingable in the vertical direction, and a link rod and an offset cylinder arranged on one side of the offset boom. The link rod includes the proximal boom and the front boom. lateral direction swingably connected to, the offset cylinder is connected pivotably to the base end boom and an offset boom, the link rod In a construction machine offset cylinders are arranged in the driver's seat side of the hydraulic excavator and the constructed box-like cross-sectional structure by the first component and the second component, as well it is applied to the offset boom, the first The link rod and the offset cylinder are arranged on the side plate portion of the component member, and the side edge portion of the first component member protrudes outward from the second component member, so that one end edge of the first component member is the first edge. 2 It was comprised so that it might protrude to the side of a structural member .
[0010]
The side surface on the driver's seat side where the link rod and offset cylinder of the offset boom are arranged does not come into contact with an obstacle by the link rod and offset cylinder (in general, in order to prevent damage to the link rod and offset cylinder, These are arranged on the driver's seat side of the construction machine for easy visual inspection.) The opposite side surface of the offset boom may be damaged by contacting with the groove wall, for example, when digging the side groove. According to the present invention, the side edge of the first component member is more than the second component member. Since it protrudes outward, it is possible to minimize scratches by contacting only this edge. Further, when the first component member is made thick and one end edge of the first component member protrudes toward the side surface, damage (deformation) due to contact can be further reliably suppressed. Furthermore, when configured in this way, the offset cylinder is pivotally supported by the first component member, so that the offset cylinder pushes the thick, high-strength first component member, and deformation can be prevented. Since the second component member is thinner than the first component member, the weight of the offset boom can be reduced. Thereby, the front weight of a construction machine can be reduced and an airframe balance can be improved.
[0011]
According to a fifth aspect of the present invention, the link rod has a box-shaped cross-sectional structure disposed in parallel with the offset boom, and the offset cylinder is disposed between the offset boom and the link rod. Even if the link rod has a box-shaped cross-section, the offset boom is configured by two offset booms arranged in parallel, and an offset cylinder is installed between them. Since the side edge of the first component of the offset boom protrudes outward from the second component, only this edge contacts the obstacle such as the groove wall to minimize scratches. Can be suppressed. Further, when the first component member is made thick and one end edge of the first component member protrudes toward the side surface, damage (deformation) due to contact can be further reliably suppressed. Furthermore, when configured in this way, the offset cylinder is pivotally supported by the first component member, so that the offset cylinder pushes the thick, high-strength first component member, and deformation can be prevented. Since the second component member is thinner than the first component member, the weight of the offset boom can be reduced. Thereby, the front weight of a construction machine can be reduced and an airframe balance can be improved.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a first embodiment of the present invention. In the figure, components that are the same as those in the prior art are denoted by the same reference numerals. In the figure, 1 ′ is a hydraulic excavator, 4 ′ is a work attachment, and 50 is an offset boom. FIG. 2 is a cross-sectional view taken along the line AA of FIG. In the figure, 51 is the first component member, 52 is the second component member, 53 is the lower plate portion of the first component member 51, 54 is the side plate portion of the first component member 51, and 55 is the side of the first component member 51. Side edge 56, upper edge of first component 51, 57 upper plate of second component 52, 58 side plate of second component 52, 59 below second component 52 A side edge portion, 60 is a side edge portion of the second component member 52, and 61 is an offset cylinder pivot bracket.
[0013]
According to the present embodiment, the first component member 51 is formed by bending a relatively thick steel plate into an L shape in a cross-sectional view. An offset cylinder pivot bracket 61 is fixed to the side plate portion of the first component member 51 by welding. The second component member 52 is formed by bending a steel plate thinner than the first component member 51 into an L shape in a cross-sectional view. Further, the lower edge 59 of the second component 52 is in contact with the upper surface of the lower plate portion 53 of the first component 51, and the second component 52 is in contact with the upper edge 56 of the first component 51. The first component member 51 and the second component member 52 are fixed by welding so that the lower surface of the upper plate portion 57 is in contact.
[0014]
The operation of this embodiment will be described with reference to FIG. With such a configuration, the length of the welded portion can be shortened as compared with the prior art shown in FIG. 8, and the production efficiency and production cost can be suppressed. Also, the prior art shown in FIG. Thus, since strict dimensional management is not necessary, production efficiency can be improved.
[0015]
In this embodiment, the offset cylinder pivot bracket 61 is fixed to the side plate portion 54 of the thick first component member 51, and the offset cylinder 11 pushes and pulls the first component member 51 to swing the offset boom 50 left and right. Since they are moved, they are not deformed by the acting force of the offset cylinder 11. Further, since the second component member 52 is thinner than the first component member 51, the offset boom 50 can be reduced in weight, and the second component member 52 is not directly subjected to a large force. Even when formed by the above, deformation or the like does not occur.
[0016]
Further, since the side edge 55 of the thick first component member 51 projects outward from the side plate portion 58 of the second component member 52, when the excavator 1 performs side groove excavation, the groove wall Even if the offset boom is brought into contact with the side wall, the side edge 55 is only in contact with the side wall, and the large area of the side plate 58 is not damaged. In addition, since the offset cylinder 11 and the link rod 12 are normally arranged on the driver's seat side of the hydraulic excavator, it is possible to pay attention on the driver's seat side that can be visually observed. There is a low possibility that it will be deformed or damaged by contact with the surface. In this side plate portion 58, the name of the hydraulic excavator manufacturer, the name of the civil engineering contractor who is the user, the name of the rental contractor, etc., and the mark indicating these are often entered. Therefore, according to the configuration of the present embodiment, It is possible to prevent a situation in which these characters and marks are damaged and cannot be read.
[0017]
In addition, since only the upper plate portion 57 of the second component member 52 appears on the upper surface of the offset boom 50, it is possible to obtain an aesthetic appearance and to prevent stagnation of rainwater or the like because no step is generated.
[0018]
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a plan view of a work attachment according to the second embodiment. In the figure, 70 is a work touchment, 71 is a proximal boom, 72 is an offset boom, 73 is a front boom, 74 is an arm, 75 is a bucket, 76 is an arm cylinder, 77 is an offset cylinder, and 78 and 79 are offset cylinders 77. The offset cylinder pivot bracket 80 pivotally supports the first offset boom component structure 80, the second offset boom component structure 100, and the first offset boom component structure 80 or the second offset boom component structure 100. Either one corresponds to the link rod 12 in the first embodiment described above. Here, for convenience of explanation, it is assumed that the second offset boom constituent structure 100 corresponds to the link rod 12.
[0019]
In the present embodiment, as described above, the link rod is configured with a box-shaped cross-sectional structure to form the second offset boom constituting structure 100. The offset cylinder 77 is pivotally supported by the first offset boom constituent structure 80 and the second offset boom constituent structure 100, and the first offset boom constituent structure 80 and the second offset boom constituent structure are expanded and contracted by the offset cylinder 77. 100 swings to the left and right while maintaining a parallel state. As a result, the front-rear direction center line of the front boom 73 (arm 74) is offset in parallel to the front-rear direction center line of the base end boom 71. Note that one end of the offset cylinder 77 may be pivotally supported by the proximal boom or the front boom. Since the offset cylinder 77 is disposed between the first offset boom constituent structure 80 and the second offset boom constituent structure 100 having a strong box-shaped cross-sectional structure, the offset cylinder 77 is used as an obstacle such as a groove wall during excavation. It will not be damaged by contact.
[0020]
4 is a cross-sectional view taken along line BB in FIG. In the figure, 81 is a first component member of the first offset boom component structure 80, 82 is a second component member of the first offset boom component structure 80, 83 is a lower plate portion of the first component member 81, and 84 is a first component member. 1 is a side plate portion of the first component member 81, 85 is a side edge portion of the first component member 81, 86 is an upper edge portion of the first component member 81, 87 is an upper plate portion of the second component member 82, and 88 is A side plate portion of the second component member 82, 89 is a lower edge portion of the second component member 82, and 90 is a side edge portion of the second component member 82. Reference numeral 101 denotes a first constituent member of the second offset boom constituent structure 100, reference numeral 102 denotes a second constituent member of the second offset boom constituent structure 100, reference numeral 103 denotes a lower plate portion of the first constituent member 101, and reference numeral 104 denotes a first constituent member. The side plate portion of the component member 101, 105 is the side edge portion of the first component member 101, 106 is the upper edge portion of the first component member 101, 107 is the upper plate portion of the second component member 102, and 108 is the first plate portion. A side plate portion of the second component member 102, 109 is a lower edge portion of the second component member 102, and 110 is a side edge portion of the second component member 102.
[0021]
The configuration and operation of this embodiment will be described with reference to FIGS. In each of the first offset boom constituent structure 80 and the second offset boom constituent structure 100, the first constituent members 81 and 101 are configured by bending a relatively thick steel plate into an L shape in a sectional view. . Further, offset cylinder pivot brackets 78 and 79 are fixed to the first plate members 81 and 101 by welding to the first offset boom component structure 80 and the second offset boom component structure 100, respectively. The second component members 82 and 102 are configured by bending a steel plate thinner than the first component members 81 and 101 into an L shape in a cross-sectional view. Further, the lower edge portions 89 and 109 of the second component members 82 and 102 are in contact with the upper surfaces of the lower plate portions 83 and 103 of the first component members 81 and 101, respectively. The first component members 81 and 101 and the second component members 82 and 102 are welded to the upper edge portions 86 and 106 so that the lower surfaces of the upper plate portions 87 and 107 of the second component members 82 and 102 are in contact with the upper edge portions 86 and 106, respectively. It is stuck.
[0022]
According to this embodiment, the same operation as that of the first embodiment described above can be obtained for each of the first offset boom constituent structure 80 and the second offset boom constituent structure 100. That is, the offset cylinder pivot brackets 78 and 79 are fixed to the side plates 84 and 104 of the thick first constituent members 81 and 101, respectively, and the offset cylinder 77 pushes and pulls the first constituent members 81 and 101. Since the offset boom 72 is swung left and right, it is not deformed by the acting force of the offset cylinder 77. Further, since the second component members 82 and 102 are thinner than the first component members 81 and 101, the offset boom 72 can be reduced in weight, and a large force is directly applied to the second component members 82 and 102. Therefore, even if it is formed of a thin steel plate, no deformation or the like occurs.
[0023]
Further, since the side edge portions 85 and 105 of the thick first constituent members 81 and 101 protrude outward from the side plate portions 88 and 108 of the second constituent members 82 and 102, respectively, the hydraulic excavator 1 is When performing side groove excavation, even if the offset boom 72 is brought into contact with the side wall of the groove wall, only the side edge 85 or 105 comes into contact with the side wall, and the wide area of the side plate portions 88 and 108 may be damaged. Absent. The side plate portions 88 and 108 are often filled with the name of the manufacturer of the hydraulic excavator, the name of the civil engineering contractor who is the user, the name of the rental contractor, etc., and a mark indicating them. Thus, it is possible to prevent a situation in which these characters and marks are damaged and cannot be read.
[0024]
In addition, since only the upper plate portions 87 and 107 of the second component members 82 and 102 appear on the upper surface of the offset boom 72, it is possible to obtain an aesthetic appearance and to prevent the retention of rainwater and the like because no step is generated. Can do.
[0025]
FIG. 5 is a cross-sectional view showing the third embodiment of the present invention, and corresponds to the AA cross section of FIG. 1 showing the first embodiment. In the figure, the same components as those in the first embodiment are denoted by the same reference numerals. 120 is an offset boom, 121 is a first component member, 122 is a second component member, 123 is a lower plate portion of the first component member 121, 124 is a side plate portion of the first component member 121, and 125 is a first component member 121. Side edge portions 126, 126 is an upper edge portion of the first component member 121, 127 is an upper plate portion of the second component member 122, 128 is a side plate portion of the second component member 122, and 129 is the second component member 122. The lower end edge portion, 130 is a side end edge portion of the second component 122, and 131 is an offset cylinder pivot bracket.
[0026]
According to this embodiment, the lower edge 129 of the second component 122 is fixed to the upper surface of the lower plate 123 of the first component 121 by welding, and the side plate 124 of the first component 121 is fixed. The side edge portion 130 of the second component member 122 is fixed to the rear surface side of the second member 122 by welding. According to this, since a step is generated on the upper surface of the offset boom 120, there is a possibility that stagnation of rainwater or the like may occur. However, with regard to assemblability, a further allowance is provided for dimensional accuracy than that of the first embodiment. Can do. That is, even if a slight dimensional error occurs during bending of the first component member 121 or the second component member 122, the first component member 121 and the second component member 122 can be reliably brought into contact and fixed by welding. Other operations are the same as those in the first embodiment.
[0027]
【The invention's effect】
According to the first aspect of the present invention, the first component member and the second component member, each of which has an L-shaped cross section, are joined so that the inner angles thereof face each other, and the first component member or the second component member Since one end edge protrudes to the side, the protruded edge portion comes into contact with an obstacle such as a groove wall first, so that the side surface portion can be prevented from coming into contact and being damaged. Moreover, since it is a combination of L-shapes, a slight margin can be obtained in the dimensional system, and the production efficiency can be improved.
[0028]
According to a second aspect of the present invention, the first component member is formed by bending a thick plate material than the second component member, and one end edge of the first component member protrudes laterally. Since it did in this way, since a strong 1st structural member with high intensity | strength protrudes sideways, the damage at the time of making it contact with obstacles, such as a groove wall, can be made small. Moreover, since the second component member can be made thinner than the first component member, an increase in weight can be suppressed.
[0029]
According to a third aspect of the present invention, in the case where one end edge of the first component member protrudes laterally and the second component member protrudes to the other side, the first component member The other end edge does not appear on the top surface of the box-shaped cross-sectional structure, and the aesthetics in top view can be improved. Moreover, since unevenness does not occur on the upper surface, the retention of rainwater can be prevented.
[0030]
Alternatively, according to the fourth aspect of the invention, the side surface on the driver's seat side where the link rod and the offset cylinder of the offset boom are arranged does not come into contact with the obstacle by the link rod and the offset cylinder (generally, In order to prevent damage to the link rod and offset cylinder, these are arranged on the driver's seat side of the construction machine for easy visual inspection.) The opposite side surface of the offset boom may be damaged by contacting with the groove wall, for example, when digging the side groove. According to the present invention, the side edge of the first component member is more than the second component member. Since it protrudes outward, it is possible to minimize scratches by contacting only this edge. Further, when the first component member is made thick and one end edge of the first component member protrudes toward the side surface, damage (deformation) due to contact can be further reliably suppressed. Furthermore, when configured in this way, the offset cylinder is pivotally supported by the first component member, so that the offset cylinder pushes the thick, high-strength first component member, and deformation can be prevented. Since the second component member is thinner than the first component member, the weight of the offset boom can be reduced. Thereby, the front weight of a construction machine can be reduced and an airframe balance can be improved.
[0031]
According to a fifth aspect of the present invention, the link rod has a box-shaped cross-sectional structure disposed in parallel with the offset boom, and the offset cylinder is provided between the offset boom and the link rod. since the arranged configuration, the link rod and box-shaped cross-sectional structure, constituted by parallel arranged offset boom as if two offset boom, when as the interior of the offset cylinder between them Even if there is, the side edge portion of the first component member of the offset boom protrudes outward from the second component member, so that only this edge portion is damaged by contacting an obstacle such as a groove wall. Can be minimized. Further, when the first component member is made thick and one end edge of the first component member protrudes toward the side surface, damage (deformation) due to contact can be further reliably suppressed. Furthermore, when configured in this way, the offset cylinder is pivotally supported by the first component member, so that the offset cylinder pushes the thick, high-strength first component member, and deformation can be prevented. Since the second component member is thinner than the first component member, the weight of the offset boom can be reduced. Thereby, the front weight of a construction machine can be reduced and an airframe balance can be improved.
[0032]
As described above, according to the present invention, when a construction machine such as a hydraulic excavator to which the present invention is applied performs groove excavation, for example, the box-shaped cross-sectional structure part constituting the work attachment is brought into contact with the groove wall. Even in this case, it is possible to reduce the surface that is damaged by contact, and even if the name of the manufacturer of the construction machine is written on the side surface, it can be prevented that the surface cannot be read due to damage. In addition, the work attachment can be reduced in weight and can be prevented from being damaged.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line AA of FIG.
FIG. 3 is a plan view of a work attachment showing a second embodiment of the present invention.
4 is a cross-sectional view taken along the line BB in FIG.
FIG. 5 is a cross-sectional view showing a third embodiment of the present invention.
FIG. 6 is a side view of a hydraulic excavator showing an embodiment of the prior art.
7 is a side view of the work attachment of the excavator of FIG. 6 as viewed from the opposite side.
8 is a cross-sectional view taken along the line CC of FIG.
FIG. 9 is a cross-sectional view showing another embodiment of the prior art.
[Explanation of symbols]
4, 4 ', 70 Work attachment 6, 6a, 6b, 50, 72, 120 Offset boom 11, 77 Offset cylinder 12 Link rod 51, 81, 101, 121 First component 52, 82, 102, 122 Second configuration Element

Claims (5)

 The first component member and the second component member, each of which has an L-shaped cross section, are joined so that the inner angles thereof face each other, so that one end edge of the first component member or the second component member protrudes laterally. A box-shaped cross-sectional structure applied to a work attachment of a construction machine, characterized by comprising.  2. The first component member is formed by bending a thick plate material than the second component member, and one end edge of the first component member protrudes laterally. A box-shaped cross-section structure applied to the work attachment of the described construction machine.  3. The construction machine according to claim 1, wherein one end edge of the first component member protrudes laterally and the second component member protrudes laterally. 4. Box-shaped cross-section structure applied to work attachments. A work attachment attached to an upper revolving body connected to a lower traveling body so as to be capable of swinging up and down, wherein the work attachment includes a base end boom connected to the upper revolving body so as to swing up and down. An offset boom coupled to the distal end of the proximal boom so as to be swingable in the left-right direction; a front boom coupled to the distal end of the offset boom so as to be swingable in the lateral direction; And a link rod disposed on one side of the offset boom and an offset cylinder, and the link rod is connected to the base end boom and the front boom so as to be swingable in the left-right direction. , the offset cylinder is connected pivotably to the base end boom and an offset boom, said link rod and offset cylinder oil In the construction machine which is arranged on the driver's side of the shovel, the constructed box-like cross-sectional structure by the first component and the second component, as well be applied to the offset boom, the side plate portion of the first component The link rod and the offset cylinder are arranged on the side, and the side edge of the first component member protrudes outward from the second component member, so that one end edge of the first component member is on the side of the second component member. The work attachment for a construction machine according to any one of claims 1 to 3, wherein the work attachment projects . The link rod is configured in the offset boom and arranged parallel to a box-shaped cross section, the offset cylinder, according to claim 4, characterized in that said disposed between the offset boom and the link rod Working equipment attachments.

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