JP2011184920A - Working arm for construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance workability when attaching an attachment member for an attached component to a working arm made of a box body. <P>SOLUTION: Through-holes 28, which comprise a cover body through-hole 28A and a mounting member through-hole 28B are provided in right and left side surfaces 22D and 22C of an arm body 22 constituting an arm 21, respectively; and a cover body 29 inserted into the arm body 22 through the through-hole 28 is fixed to the arm body 22 by means of a bolt 31. Thus, the through-hole 28 is closed with the cover body 29; and the attachment member 30 provided integrally with the cover body 29 can be fixed to the arm body 22 via the cover body 29. This can dispense with, for example, the operation of working an internal thread hole in the arm, the operation of casting an internal thread member into the arm when cast-molding the arm, and the operation of welding a screw seat member to the arm, and can enhance the workability when attachment the attaching member 30 to the arm 21. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a construction machine working arm that is preferably used as a boom, an arm, or the like that constitutes a working device of a hydraulic excavator, for example.

  In general, a hydraulic excavator as a representative example of a construction machine includes a crawler-type lower traveling body and an upper revolving body that is turnably mounted on the lower traveling body to form a self-propelled vehicle body. A working device is provided on the front side of the head so as to move up and down. And a hydraulic excavator performs excavation work of earth and sand, etc. using a working device, turning an upper revolving structure.

  Here, the excavator working device includes a boom whose base end side is rotatably attached to the upper swing body, an arm that is rotatably attached to the distal end side of the boom, and a pivoting side toward the distal end side of the arm. The bucket is roughly constituted by a movably attached bucket, a boom cylinder, an arm cylinder, and a bucket cylinder.

  The boom and the arm as the construction machine working arm are usually formed as a box body surrounded by an upper surface, a lower surface, a left side surface, and a right side surface and closed inside. Thereby, the boom and the arm can maintain sufficient strength against excavation work and the like while reducing the weight (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 6-220881

  By the way, hydraulic excavator working devices are provided with hydraulic piping for supplying pressure oil to boom cylinders, arm cylinders, bucket cylinders, and external devices such as hand breakers (rock drills) and tampers (consolidators). A hydraulic pipe (hereinafter referred to as an extra pipe) for supplying pressure oil to the hydraulic equipment is provided. In this case, the proximal end side of the extra piping is connected to a hydraulic pump via a control valve or the like, and the distal end side of the extra piping is usually fixed to the side surface of the arm using a bolt or the like.

  For example, when excavating soil using a hydraulic excavator, if the ground or rock to be excavated is hard, connect the hydraulic hose of the hand breaker to the tip of the extra piping, and the hand breaker A method of crushing the bedrock is adopted. Thereby, after crushing hard ground or the like, the ground can be excavated efficiently by the bucket of the excavator.

  By the way, when fixing an extra pipe as an accessory to the arm of a hydraulic excavator, a bolt hole (female screw hole) is screwed on the side of the arm, and a pipe fixing tool is attached using a bolt screwed into the bolt hole. By attaching, the extra pipe is fixed between the pipe fixing tool and the screw seat.

  However, the arm of the hydraulic excavator is configured by a box body whose inside is closed. For this reason, for example, when screwing a bolt hole on the side surface of the arm, it is necessary to form a bolt hole around the lower hole after drilling a lower hole on the side surface of the arm. Therefore, it takes a lot of time to install, and there is a problem that the workability is lowered.

  Further, when an arm made of a box body is formed using a casting means, it is conceivable to cast a female screw member such as a nut when casting the arm. However, in this case, there is a problem that looseness and rust are likely to occur at the boundary between the molten metal for the arm and the nut, and the mounting strength of the female screw member to the arm is reduced.

  Furthermore, it is conceivable to prepare a block-shaped screw seat member in which a bolt hole is screwed and fix the screw seat member to the side surface of the arm by welding. However, when the arm is cast using, for example, cast iron or the like, there is a problem that it is difficult to weld the screw seat member to the arm itself.

  The present invention has been made in view of the above-described problems of the prior art, and can securely attach an attachment member for an accessory part to a box body constituting a work arm, and improve workability when attaching the attachment member. It is an object of the present invention to provide a working arm for a construction machine that can be used.

  In order to solve the above-described problems, the present invention is a construction machine that is formed as a box body that is surrounded by an upper surface, a lower surface, a left side surface, and a right side surface and is closed inside, and constitutes a part of a work device mounted on the construction machine. Applicable to working arms.

  According to a first aspect of the present invention, at least one of the four surfaces constituting the box body is provided with a through-hole penetrating the surface, and through the through-hole from the outer surface side of the box body. A lid that is inserted on the inner surface side and is attached to the box body with the through hole closed from the inner surface side of the box body, and an attachment for attaching an accessory to the box body on the outer surface side of the lid body It is in the structure which provides a member.

  The invention of claim 2 is that the box body is integrally formed as a cast structure together with the through hole using a casting means.

  According to a third aspect of the present invention, the through-hole includes a lid body passage hole having a dimension through which the lid body can pass and an attachment member passage hole having a dimension through which the attachment member can pass. The lid body is composed of a short portion having a length smaller than the lid passage hole and a long portion having a length larger than the lid passage hole; Bolt holes are provided at positions corresponding to the lid passage holes on both ends of the portion, and the bolts inserted into the lid passage holes in the state where the through holes are closed by the lid body are screwed into the bolt holes. It is in the configuration.

  According to a fourth aspect of the present invention, the mounting member includes a fixed portion fixed to the outer surface side of the lid body, and a mounting seat that faces the outer surface of the lid body from the fixed portion with a gap and serves as a mounting seat for the accessory part. And the mounting seat is engaged with the peripheral edge of the through hole when the lid is inserted into the inner surface of the box through the through hole. It is in the structure which suppresses falling to the inside of.

  According to the first aspect of the present invention, the lid body is inserted into the block body through the through hole provided in the block body, and the through hole is blocked from the inner surface side of the block body by the lid body. A lid can be attached. Thereby, the attachment member provided in the outer surface side of the cover body can be reliably fixed to the block body through the cover body.

  Therefore, for example, the work of screwing a bolt hole into the block body as in the prior art, the work of casting the female screw member into the block body when casting the block body, the work of welding the screw seat member to the block body, etc. are unnecessary. Therefore, workability when attaching the attachment member for the accessory part to the block body can be improved. In addition, by closing the through hole provided in the block body with the lid body, it is possible to reliably suppress the intrusion of earth and sand, rainwater, etc. into the block body through the through hole, thereby extending the life of the block body. Can do.

  According to invention of Claim 2, when forming a block body using a casting means, a through-hole can be integrally formed in this block body. As a result, it is not necessary to form a through hole in the cast block body by post-processing, and the attachment member for the accessory part can be fixed to the block body using the through hole integrally formed in the block body. The workability when attaching the mounting member to the block body can be further enhanced.

  According to the invention of claim 3, the attachment member is provided by the cover member passing through the cover member passage hole of the through hole, and the attachment member provided on the cover member passing through the attachment member passage hole of the through hole. The lid body can be easily inserted from the outer surface side to the inner surface side of the box body. In this case, since the long portion of the lid body is larger in length than the lid body passage hole, the through hole can be reliably closed by the long portion of the lid body inserted on the inner surface side of the block body. Then, the bolt inserted through the lid passage hole is screwed into the bolt holes provided at both ends of the long portion, so that the lid and the mounting member are blocked while the through hole is closed by the lid. Can be securely fixed to the body.

  According to the invention of claim 4, since a gap is formed between the mounting seat portion of the mounting member and the outer surface of the lid body, when the lid body is inserted into the inner surface side of the box body, the mounting seat portion is It can engage with the peripheral edge of the through hole. As a result, it is possible to prevent the lid body from being accidentally dropped into the block body when the lid body is fixed to the block body, and workability when the lid body and the mounting member are fixed to the block body. Can be increased.

1 is a front view showing a hydraulic excavator according to a first embodiment of the present invention. It is a front view similar to FIG. 1 which shows the state which connected the hand breaker to the front-end | tip part of extra piping. It is a front view of the principal part expansion which shows the arm in FIG. 1, a through-hole, a cover body, etc. FIG. 4 is an enlarged cross-sectional view of an arm, a through hole, a lid, an extra pipe, and the like when viewed from the direction of arrows IV-IV in FIG. It is a perspective view which shows an arm alone. It is sectional drawing which looked at the arm from the arrow VI-VI direction in FIG. It is a front view which expands and shows a through-hole. It is a perspective view which shows a cover body and an attachment member. It is a front view which expands and shows a cover body and an attachment member. It is the side view which looked at the cover body and the attachment member from the arrow XX direction in FIG. It is a disassembled perspective view which shows a through-hole, a cover body, an attachment member, extra piping, etc. It is a front view which shows the state which inserts a cover body and an attachment member into the inside of an arm through a through-hole. It is a front view which shows the state which made the cover body inserted in the inside of an arm face the side surface of an arm. It is a front view which shows the state which closed the through-hole by rotating a cover body. It is a front view which shows the state which bolted the cover body to the side surface of the arm. It is a front view which shows the through-hole by 2nd Embodiment. It is a front view which shows the state which obstruct | occluded the through-hole by 2nd Embodiment with the cover body. It is a front view which shows the through-hole by 3rd Embodiment. It is a front view which shows the state which obstruct | occluded the through-hole by 3rd Embodiment with the cover body.

  Hereinafter, an embodiment of a construction machine working arm according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the working arm is applied to an arm of a hydraulic excavator.

  1 to 15 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. A vehicle body of the hydraulic excavator 1 is mounted on a self-propelled crawler type lower traveling body 2 and on the lower traveling body 2 so as to be turnable. And the upper revolving body 3. A working device 10 to be described later is provided on the front side of the upper swing body 3 so as to be able to move up and down, and the working device 10 is used for excavating earth and sand.

  Reference numeral 4 denotes a revolving frame serving as a base of the upper revolving structure 3, and a support bracket 4 </ b> A for supporting a work device 10 described later is provided on the front end side of the revolving frame 4. A counterweight 5 that balances the weight of the working device 10 is disposed on the rear end side of the revolving frame 4.

  6 is an exterior cover provided on the revolving frame 4, and the exterior cover 6 is disposed so as to extend from above the counterweight 5 toward the front side of the revolving frame 4. And the exterior cover 6 is formed as a prone cover which covers mounted equipments (all not shown), such as heat exchangers, such as an engine and a radiator, and a hydraulic pump, from the upper side, for example.

  Reference numeral 7 denotes a driver seat disposed on the upper surface side of the exterior cover 6, and the driver seat 7 is seated by an operator. In addition, a floor board 8 is provided on the front side of the exterior cover 6 so as to be located above the revolving frame 4, and the operator gets on and off the driver's seat 7 using the floor board 8 as a scaffold. Further, on the front side of the floor board 8, a lever stand 9 having a traveling lever 9A, a working lever 9B, and the like is erected.

  Reference numeral 10 denotes a swing type work device provided on the front side of the upper swing body 3 so as to be able to move up and down. The work device 10 is attached to a support bracket 4A of the swing frame 4 so as to be swingable left and right. A swing post 11, a boom 12 whose base end side is rotatably attached to the swing post 11, and an arm 21 described later that is rotatably attached to the distal end side of the boom 12 using a connecting pin 13. The bucket 21 is generally constituted by a bucket 15 that is rotatably attached to the distal end side of the arm 21 using a connecting pin 14.

  In this case, the boom 12 and an arm 21 which will be described later constitute a working arm, and the boom 12 is surrounded by an upper surface 12A, a lower surface 12B, left and right side surfaces 12C (only the left side surface is shown), and the inside is closed. It is formed as a rectangular box.

  A swing cylinder (not shown) that swings the swing post 11 left and right is provided between the swing frame 4 and the swing post 11, and between the swing post 11 and the boom 12, A boom cylinder 16 is provided for rotating the boom 12 (back and up). Further, an arm cylinder 17 that rotates the arm 21 is provided between the boom 12 and the arm 21, and a bucket that rotates the bucket 15 via the bucket link 18 is provided between the arm 21 and the bucket 15. A cylinder 19 is provided.

  The boom cylinder 16 is connected to a boom cylinder hose 16 </ b> A that supplies and discharges pressure oil to the boom cylinder 16. The arm cylinder 17 supplies and discharges pressure oil to and from the arm cylinder 17. A hose 17A is connected. The bucket cylinder 19 is connected to a bucket cylinder hose 19 </ b> A for supplying and discharging pressure oil to and from the bucket cylinder 19.

  Next, reference numeral 21 denotes an arm as a working arm used in the present embodiment, and the arm 21 is rotatably attached to the tip end side of the boom 12 via a connecting pin 13. Here, as shown in FIGS. 5 and 6, the arm 21 includes an arm main body 22, a boom connection boss 24, a bucket connection boss 25, a bucket link connection boss 26, left and right cylinder brackets 27, left and right, as will be described later. For example, a cast structure is formed integrally using a casting means.

  Reference numeral 22 denotes an arm main body that constitutes a main body portion of the arm 21. The arm main body 22 includes an upper surface 22A and a lower surface 22B that face upward and downward, a left side 22C and a right side 22D that face left and right. It is surrounded and formed. Thereby, the arm main body 22 is formed as a box body extending in the front and rear directions with a substantially square cross-sectional shape, and the inside of the arm main body 22 is a closed arm inner space 23. Also, through holes 28 described later are formed in the left side surface 22C and the right side surface 22D of the arm body 22, respectively.

  Here, a boom connecting boss 24 is integrally provided at a rear end portion where the upper surface 22A and the lower surface 22B of the arm body 22 intersect, and the boom connecting boss 24 is connected to the front end side of the boom 12 via the connecting pin 13. It is pin-coupled so that it can rotate. Further, a bucket connecting boss 25 is integrally provided at a front end portion where the upper surface 22A and the lower surface 22B of the arm body 22 intersect, and the bucket connecting boss 25 is a pin that allows the bucket 15 to rotate via the connecting pin 14. It is the composition which is combined. Further, a bucket link connection boss 26 is integrally provided at a position spaced from the bucket connection boss 25 toward the boom connection boss 24, and the bucket link connection boss 26 is pin-coupled so that the bucket link 18 can rotate. It has a configuration.

  Reference numeral 27 denotes left and right cylinder brackets disposed on the base end side of the arm main body 22. These left and right cylinder brackets 27 are integrally formed on the left and right left side surfaces 22C and 22D of the arm main body 22, respectively. It consists of a plate-like body. Here, each cylinder bracket 27 is provided with a bucket cylinder connecting boss 27A and an arm cylinder connecting boss 27B separated from each other in the front and rear. The bottom side of the bucket cylinder 19 is pivotally connected to the left and right bucket cylinder connection bosses 27A, and the rod side of the arm cylinder 17 is rotatable to the left and right arm cylinder connection bosses 27B. It is configured to be pin-coupled.

  Here, the arm 21 is configured as a cast structure integrally formed by using a casting means, and when the arm 21 is cast, holes necessary for manufacturing are arranged on the side surface. In this state, the molten metal is poured into the mold to integrally form the arm 21 including the arm main body 22, the boom connecting boss 24, the bucket connecting boss 25, the bucket link connecting boss 26, the left and right cylinder brackets 27, and the like. It has a configuration that can.

  Reference numeral 28 denotes through holes provided in the left and right side surfaces 22C and 22D of the arm body 22, respectively. Here, the through-hole 28 is formed integrally with the left and right side surfaces 22C and 22D of the arm main body 22 when the arm 21 is formed using casting means.

  That is, the through hole 28 is formed integrally with the left and right side surfaces 22C and 22D of the arm main body 22 by utilizing holes necessary when the arm 21 is cast as described above. In this case, since the left and right through holes 28 have the same shape, the through hole 28 formed in the left side surface 22C will be described below.

  Here, the through hole 28 penetrates the left side surface 22 </ b> C of the arm body 22 and opens into the arm internal space 23 of the arm body 22. In this case, as shown in FIGS. 5 to 7, the lid body passage hole 28 </ b> A extending in the direction (upward and downward) orthogonal to the longitudinal direction of the arm body 22, and the arm body 22 perpendicular to the lid body passage hole 28 </ b> A. The mounting member passage hole 28B extending in the longitudinal direction (front and rear directions) is formed as a cross-shaped hole as a whole. And the cover body passage hole 28A of the through-hole 28 has a dimension through which a later-described cover body 29 can pass, and the attachment member passage hole 28B has a dimension through which a later-described attachment member 30 can pass.

  In this case, as shown in FIG. 7, the dimension A1 in the longitudinal direction (upward and downward) of the lid passage hole 28A is set larger than the dimension B1 in the longitudinal direction (front and rear) of the attachment member passage hole 28B. (A1> B1). Further, the dimension A2 in the width direction (front and rear directions) of the cover body passage hole 28A is set smaller than the dimension B2 in the width direction (upward and downward direction) of the attachment member passage hole 28B (A2 <B2). .

  Reference numeral 29 denotes a lid that is detachably attached to the left side surface 22C and the right side surface 22D of the arm main body 22. The lid body 29 has through holes 28 provided on the left and right side surfaces 22C, 22D. Is closed from the inner surface side (arm inner space 23 side) of the arm body 22. In this case, since the left and right lid bodies 29 have the same shape, the lid body 29 attached to the left side surface 22C will be described below.

  Here, as shown in FIGS. 8 to 10, the lid body 29 is formed in a substantially rhombic flat plate shape using a steel plate material or the like, and has a length dimension smaller than the lid body passage hole 28 </ b> A of the through hole 28. The short dimension part 29A and the long dimension part 29B whose length dimension is larger than the cover body passage hole 28A are comprised. Bolt holes (female screw holes) 29C penetrating in the plate thickness direction are respectively screwed on both ends of the long portion 29B of the lid body 29 in the length direction. 31 is configured to be screwed together.

  In this case, as shown in FIG. 9, the dimension C1 of the short portion 29A of the lid 29 is set smaller than the dimension A1 of the through hole 28 in the longitudinal direction of the lid passage hole 28A (C1 <A1). The dimension C2 of the long portion 29B of the body 29 is set to be larger than the dimension A1 in the longitudinal direction of the cover body passage hole 28A of the through hole 28 (C2> A1).

  Reference numeral 30 denotes an attachment member 30 that is integrally provided in the central portion of the lid 29. The attachment member 30 attaches accessory parts such as an extra pipe 33 described later. Here, as shown in FIGS. 8 to 10, the mounting member 30 is composed of a block body formed substantially in a T shape as a whole, and is fixed to the outer surface 29 </ b> D of the lid body 29 by means of welding or the like. A fixing portion 30A, a mounting seat portion 30B extending from the fixing portion 30A in the longitudinal direction of the lid body 29 and facing the outer surface 29D of the lid body 29 with a gap, and both longitudinal sides of the mounting seat portion 30B across the fixing portion 30A And two bolt holes (female screw holes) 30C screwed to each other.

  In this case, the dimension D1 in the longitudinal direction of the attachment member 30 is set smaller than the dimension B1 in the longitudinal direction of the attachment member passage hole 28B of the through hole 28 (D1 <B1), and the dimension D2 in the width direction of the attachment member 30 is The width dimension B2 of the attachment member passage hole 28B of the through hole 28 is set smaller than the width dimension A2 of the cover body passage hole 28A (A2 <D2 <B2).

  Thus, as shown in FIG. 12, the lid 29 and the attachment member 30 are attached to the lid passage hole 28A and the attachment member 30 in a state where the short portion 29A of the lid body 29 is aligned with the lid passage hole 28A of the through hole 28. The arm main body 22 can be inserted from the outer surface side to the inner surface side through the member passage hole 28B. In addition, as shown in FIG. 13, the lid 29 and the attachment member 30 can be reversed in the arm inner space 23 of the arm main body 22 so that the lid 29 faces the inner surface of the left side surface 22 </ b> C of the arm main body 22. . Further, as shown in FIG. 14, the lid 29 is rotated in a state of facing the left side 22 </ b> C, the through hole 28 is closed by the lid 29, and the attachment member 30 is moved through the through hole 28 to the outer surface of the left side 22 </ b> C. It can be made to project to the side.

  On the other hand, as shown in FIG. 4, the distance T1 between the mounting seat 30B of the mounting member 30 and the outer surface 29D of the lid 29 is based on the thickness dimension T2 of the left side surface 22C of the arm body 22 in which the through hole 28 is formed. Is also set larger (T1> T2).

  Accordingly, when the lid 29 is inserted into the inner surface side (arm inner space 23 side) of the arm body 22 through the through hole 28 and rotated from the position shown in FIG. 13 to the position shown in FIG. When the mounting seat portion 30B is engaged with the peripheral portions of the lid body passage hole 28A and the attachment member passage hole 28B of the through hole 28, the lid body 29 and the attachment member 30 are dropped into the arm body 22. The configuration can be suppressed.

  Reference numeral 31 denotes two bolts for attaching the lid body 29 to the left side surface 22 </ b> C of the arm body 22. Each of the bolts 31 is inserted into both end portions of the lid body passage hole 28 </ b> A constituting the through hole 28. Screwed into the bolt hole 29C. Thereby, the lid 29 is fastened to the left side 22C of the arm body 22 by the bolt 31 in a state where the lid body passage hole 28A and the attachment member passage hole 28B of the through hole 28 are closed from the inner surface side of the arm body 22. The The attachment member 30 is configured to protrude to the outer surface side of the arm body 22 through the through hole 28.

  Reference numeral 32 denotes a pipe fixture attached to the attachment seat 30B of the attachment member 30. The pipe fixture 32 is formed by using a thin steel plate material or the like, and an extra pipe 33 which will be described later with the attachment seat 30B. Is fixed. Here, a semicircular arc-shaped curved portion 32A is provided in the central portion in the longitudinal direction of the pipe fixture 32, and bolt insertion holes 32B are formed on both end sides of the curved portion 32A.

  Reference numeral 33 denotes two extra pipes as accessory parts disposed in the work apparatus 10, and each extra pipe 33 is used for operating an external hydraulic device such as a hand breaker 35 described later, as shown in FIG. 1. Pressure oil is supplied. Here, each extra piping 33 is comprised by the hydraulic hose, for example, The base end side is connected to the hydraulic pump (all are not shown) via the control valve etc.

  And the hose coupling 33A is provided in the front end side of each extra piping 33, and the hose coupling 33A of one extra piping 33 is the attachment member 30 attached to the left side 22C of the arm main body 22, as shown in FIG. The bolt 34 inserted into the bolt insertion hole 32 </ b> B of the pipe fixing tool 32 is screwed into the bolt hole 30 </ b> C of the mounting member 30 while being sandwiched between the pipe fixing tool 32 and the pipe fixing tool 32. And fixed to the left side 22C. Similarly, the hose joint 33A of the other extra pipe 33 is also fixed to the right side surface 22D via an attachment member 30 attached to the right side surface 22D.

  Reference numeral 35 denotes a hydraulic hand breaker (rock drill). The hand breaker 35 is an example of an external hydraulic device driven by hydraulic oil from a hydraulic pump (not shown) mounted on the hydraulic excavator 1. ing. Here, as shown in FIG. 1, the hand breaker 35 has a crushing bit 35A that vibrates up and down by a hydraulic exciter, and crushes hard ground or rock that cannot be excavated by the bucket 15 of the excavator 1. To do.

  Then, by connecting the two hydraulic hoses 35B connected to the hand breaker 35 to the hose joints 33A of the two extra pipes 33 fixed to the left and right side surfaces 22C and 22D of the arm body 22, respectively. The hand breaker 35 can be driven by hydraulic oil from a hydraulic pump (not shown) mounted on the excavator 1.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. When performing excavation work of earth and sand using the hydraulic excavator 1, an operator seated on the driver's seat 7 moves the travel lever 9A of the lever stand 9. Etc., the lower traveling body 2 is self-propelled to move the excavator 1 to the work site.

  Then, after the excavator 1 has moved to the work site, the operator operates the work lever 9B and moves the work device 10 up and down while turning the upper swing body 3 so that the bucket 15 can perform excavation work such as earth and sand. It can be carried out.

  Here, when there is hard ground or rock that cannot be excavated by the bucket 15 during excavation work, the arm 21 is configured with the operation of the work device 10 stopped as shown in FIG. A hydraulic hose 35 </ b> B of the hand breaker 35 is connected to the extra pipe 33 fixed to the arm body 22.

  And by supplying the pressure oil from the hydraulic pump mounted in the hydraulic excavator 1 to the hand breaker 35 through the extra pipe 33, the hand breaker 35 can be operated and the hard ground or the like can be crushed. In this way, after crushing hard ground or the like with the hand breaker 35, the hydraulic hose 35B of the hand breaker 35 is removed from the extra pipe 33, thereby smoothly excavating the ground again using the bucket 15 of the work device 10. be able to.

  Here, in the hydraulic excavator 1 according to the present embodiment, when the arm 21 is formed using casting means, the through holes 28 are integrally formed on the left and right side surfaces 22C and 22D of the arm body 22, and the through holes 28 are formed. The attachment member 30 for fixing the extra piping 33 is attached to the arm 21 using the above. Therefore, an operation of attaching the attachment member 30 to the left side surface 22C of the arm body 22 will be described with reference to FIGS.

  First, as shown in FIG. 12, the lid 29 integrally provided with the attachment member 30 is inserted into the inner surface side (arm inner space 23 side) of the arm body 22 through the through hole 28. In this case, the dimension C1 of the short portion 29A of the lid 29 is set smaller than the dimension A1 in the longitudinal direction of the lid passing hole 28A of the through hole 28, and the dimension D2 in the width direction of the mounting member 30 is The through hole 28 is set to be smaller than the width dimension B2 of the attachment member passage hole 28B. Therefore, as shown in FIG. 12, the lid 29 and the attachment member 30 are passed through the lid body passage hole 28A and the attachment member 30 by aligning the short portion 29A of the lid body 29 with the lid body passage hole 28A of the through hole 28. It can be inserted into the inner surface side of the arm body 22 through the hole 28B.

  Then, after inserting the lid body 29 and the attachment member 30 into the inner surface side of the arm body 22, the lid body 29 and the attachment member 30 are reversed within the arm internal space 23 of the arm body 22 as shown in FIG. 13. Let Accordingly, the lid 29 can be directly opposed to the left side surface 22 </ b> C of the arm body 22, and the attachment member 30 can be protruded to the outer surface side of the arm body 22 through the attachment member passage hole 28 </ b> B of the through hole 28.

  Next, as shown in FIG. 14, the lid body 29 and the attachment member 30 are rotated about 90 degrees with the lid body 29 facing the left side surface 22 </ b> C. Accordingly, the lid body passage hole 28A and the attachment member passage hole 28B of the through hole 28 are closed by the lid body 29, and each bolt hole 29C of the lid body 29 is connected to both end portions of the lid body passage hole 28A of the through hole 28. Can be aligned.

  In this case, as shown in FIG. 4, the interval T1 between the mounting seat portion 30B of the mounting member 30 and the outer surface 29D of the lid 29 is set to be larger than the thickness dimension T2 of the left side surface 22C of the arm body 22. . As a result, when the lid 29 and the attachment member 30 are rotated from the position shown in FIG. 13 to the position shown in FIG. 14, the attachment member 30 attachment seat portion 30 </ b> B becomes the lid passage hole 28 </ b> A of the through hole 28 and Engage with the peripheral edge of the attachment member passage hole 28B. As a result, it is possible to prevent the lid body 29 and the attachment member 30 from being accidentally dropped into the arm body 22, and the bolt holes 29C of the lid body 29 can be securely attached to both ends of the lid body passage hole 28A. Can be aligned.

  Thus, with the through hole 28 closed by the lid 29, the bolt 31 is inserted from the outside of the arm body 22 into the lid passage hole 28A of the through hole 28, as shown in FIGS. The bolt 31 is screwed into the bolt hole 29C of the lid 29. Thus, the lid 29 and the attachment member 30 provided on the lid 29 are firmly attached to the arm 21 using the bolt 31 in a state where the through hole 28 is closed by the lid 29 from the inner surface side of the arm body 22. Can be fixed to.

  Thus, according to the present embodiment, the left and right side surfaces 22C and 22D of the arm main body 22 constituting the arm 21 are provided with the through holes 28 including the lid body passage holes 28A and the attachment member passage holes 28B. The lid body 29 inserted into the arm body 22 through the through hole 28 is fixed to the arm body 22 using the bolt 31, so that the through hole 28 is closed by the lid body 29 and is integrally formed with the lid body 29. The provided attachment member 30 can be fixed to the arm main body 22 via the lid 29.

  Therefore, for example, the work of screwing a bolt hole in the arm as in the prior art, the work of casting a female screw member into the arm when casting the arm, and the work of welding the screw seat member to the arm are made unnecessary. Therefore, workability when attaching the attachment member 30 to the arm 21 can be improved. In addition, by closing the through hole 28 provided in the arm body 22 with the lid 29, it is possible to reliably suppress the intrusion of earth and sand, rainwater, etc. into the arm body 22 through the through hole 28. 21 lifespan can be extended.

  Further, since the through hole 28 is formed integrally with the left and right side surfaces 22C and 22D of the arm body 22 when the arm 21 is formed using casting means, the left and right side surfaces 22C and 22D of the arm body 22 are integrally formed. On the other hand, it is not necessary to form the through hole 28 by post-processing. As described above, by attaching the attachment member 30 using the through hole 28 formed integrally with the arm main body 22, workability when attaching the attachment member 30 to the arm 21 can be further enhanced.

  Further, by setting the interval T1 between the mounting seat portion 30B of the mounting member 30 and the outer surface 29D of the lid body 29 to be larger than the thickness dimension T2 of the left side surface 22C of the arm body 22, the mounting seat portion of the mounting member 30 30B can be engaged with the peripheral edge of the through hole 28. Accordingly, when the lid body 29 and the attachment member 30 are rotated from the position shown in FIG. 13 to the position shown in FIG. 14, the lid body 29 and the attachment member 30 can be prevented from being accidentally dropped into the arm body 22. And the attachment member 30 can be securely attached to the arm 21.

  Next, FIGS. 16 and 17 show a second embodiment of the present invention. The feature of the present embodiment is that the through hole is divided into a linear lid member through hole and a circular attachment member passage hole. It is in the configuration. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numeral 41 denotes a through hole provided in each of the left and right side surfaces 22C and 22D of the arm body 22 (only the through hole 41 in the left side surface 22C is shown), and the through hole 41 is the first embodiment described above. Instead of the through hole 28 according to the embodiment, it is used in the present embodiment.

  Here, the through hole 41 is formed in a lid body passage hole 41A extending linearly in a direction (upward and downward direction) orthogonal to the longitudinal direction of the arm body 22 and an intermediate portion in the length direction of the lid body passage hole 41A. It is comprised by the circular attachment member passage hole 41B which crosses. The longitudinal dimension E1 of the lid passage hole 41A is set larger than the dimension C1 of the short portion 29A of the lid body 29 (E1> C1), and the diameter E2 of the attachment member passage hole 41B is set to the lid body 29. It is set to be smaller than the dimension C1 of the short portion 29A and larger than the dimension D1 in the longitudinal direction of the mounting member 30 (C1> E2> D1).

  The second embodiment has the through-hole 41 as described above, and the basic action thereof is not particularly different from that according to the first embodiment described above. However, according to the present embodiment, it is possible to easily insert the operator's finger or the like into the through hole 41 by making the attachment member passage hole 41B circular. As a result, after the lid body 29 and the attachment member 30 are inserted into the inner surface side of the arm body 22 through the through hole 41, the lid body 29 in the arm body 22 can be easily moved to the position of FIG. When the attachment member 30 is fixed to the arm body 22 via the lid 29, workability can be improved.

  Next, FIGS. 18 and 19 show a third embodiment of the present invention, and the feature of this embodiment is that a diamond-shaped through hole that is slightly smaller than the lid 29 is used. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 51 indicates through holes provided in the left and right side surfaces 22C and 22D of the arm body 22 (only the through hole 51 in the left side surface 22C is shown), and the through hole 51 is the first embodiment described above. Instead of the through hole 28 according to the embodiment, it is used in the present embodiment.

  Here, the through hole 51 is formed in a rhombus that is slightly smaller than the lid body 29, and the lid body passage hole portion 51 </ b> A as a lid body passage hole extending in a direction orthogonal to the longitudinal direction of the arm body 22, and the arm body 22. It is comprised by the attachment member passage hole part 51B as an attachment member passage hole extended in the longitudinal direction. The dimension F1 of the lid body passage hole 51A is set larger than the dimension C1 of the short part 29A of the lid body 29 (F1> C1), and the dimension F2 of the attachment member passage hole 51B is It is set smaller than the dimension C1 of the short dimension part 29A (C1> F2).

  The third embodiment has the through-hole 51 as described above, and the basic action thereof is not particularly different from that according to the first embodiment described above. However, according to the present embodiment, since the operator's finger or the like can be easily inserted into the through hole 51, workability can be improved when the attachment member 30 is fixed to the arm body 22 via the lid 29. Can be increased.

  In each of the above-described embodiments, the case where the rhombic lid 29 having the short portion 29A and the long portion 29B is used is illustrated. However, the present invention is not limited to this. For example, an elliptical lid having a major axis and a minor axis may be used.

  In the first embodiment described above, the case where the lid 29 and the attachment member 30 are fixed to the arm 21 by using the through hole 28 provided in the arm 21 is illustrated. However, the present invention is not limited to this. For example, a through hole may be formed in the boom 12 and the lid 29 and the attachment member 30 may be fixed to the boom 12 using the through hole.

1 Hydraulic Excavator 10 Working Device 12 Boom (Working Arm)
12A Upper surface 12B Lower surface
12C Side 21 Arm (working arm)
22 Arm body 22A Upper surface 22B Lower surface 22C Left side surface 22D Right side surface 28, 41, 51 Through hole 28A, 41A Cover body passage hole 28B, 41B Attachment member passage hole 29 Cover body 29A Short part 29B Long part 29C Bolt hole 30 Attachment Member 30A Fixed part 30B Mounting seat part 31 Bolt 33 Extra piping (accessory part)
51A lid passage hole (lid passage hole)
51B Attachment member passage hole (attachment member passage hole)

Claims (4)

In the working arm for construction machinery, which is formed as a box body surrounded by the upper surface, the lower surface, the left side surface, the right side surface and closed inside, constituting a part of the working device mounted on the construction machine,
At least one of the four surfaces constituting the box body is provided with a through hole penetrating the surface,
The lid body is inserted from the outer surface side to the inner surface side of the box body through the through hole, and has a lid body attached to the box body in a state of closing the through hole from the inner surface side of the box body,
A construction machine working arm characterized in that a mounting member for attaching an accessory part to the box body is provided on an outer surface side of the lid body.   2. The construction machine working arm according to claim 1, wherein the box body is integrally formed as a cast structure together with the through hole using a casting means. The through-hole is constituted by a lid body passage hole having a dimension through which the lid body can pass and an attachment member passage hole having a dimension through which the attachment member can pass.
The lid is composed of a short portion having a length dimension smaller than the lid passage hole and a long portion having a length dimension larger than the lid passage hole,
Bolt holes are provided at both ends of the long portion of the lid body at positions corresponding to the lid body passage holes, and the bolts inserted through the lid body passage holes in a state where the through holes are closed by the lid body The work arm for a construction machine according to claim 1 or 2, wherein the work arm is configured to be screwed into the bolt hole. The mounting member comprises a fixed portion fixed to the outer surface side of the lid body, and a mounting seat portion that faces the outer surface of the lid body with a gap from the fixed portion and serves as a mounting seat for the accessory part,
The mounting seat portion is engaged with the peripheral portion of the through hole when the lid body is inserted into the inner surface side of the box body through the through hole, so that the lid body falls into the box body. The work arm for a construction machine according to claim 1, 2 or 3, wherein the construction arm is configured to suppress the movement.

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