JP2009143303A - Frame structure of construction equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the workability when repairing a damaged side frame. <P>SOLUTION: A frame structure is configured such that a repairing hole 30 through which an external wall plate 25 is repaired is formed in an internal wall plate 26 of a left side frame 24 constituted with the external wall plate 25 and the internal wall plate 26. Thus, even if the external wall plate 25 of the left side frame 24 generates a dent 31, such as a collision scar, by collision to an obstacle surrounding it, a repairing tool W is inserted inside the left side frame 24, for example, through the repairing hole 30 formed in the internal wall plate 26, to repair the scar by hammering the dent 31 on the external wall plate 25 from inside of the external wall plate 25 (on the side of the internal wall plate 26) using the tool W. Therefore, the workability when repairing the damaged left side frame 24 can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a frame structure for a construction machine that is suitably used for, for example, a hydraulic excavator, a hydraulic crane, and the like.

  In general, a hydraulic excavator as a representative example of a construction machine is a self-propelled lower traveling body, an upper revolving body that is swingably mounted on the lower traveling body, and can be raised and raised on the front side of the upper revolving body. An excavation work for earth and sand is performed by moving the working device up and down.

  In addition, the upper swing body balances the weight of the swing frame as a base, the cab disposed at the left front portion of the swing frame and defining the operator's cab, and the work device disposed at the rear end portion of the swing frame. And a building cover that is disposed on the front side of the counterweight and houses equipment such as an engine and a hydraulic pump.

  Here, the revolving frame includes a center frame having a bottom plate and left and right vertical plates erected on the bottom plate, and left and right side frames disposed on the left and right with the center frame interposed therebetween. These left and right side frames form the outer peripheral surface of the revolving frame (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 5-14252 Japanese Utility Model Publication No. 6-79851

  By the way, when the upper swinging body performs a swinging operation, an obstacle or the like existing around the hydraulic excavator collides with the side frame, so that the outer peripheral surface of the side frame has a dent (breakage) such as a partial collision mark. May occur. In this case, it is necessary to repair scars such as collision marks in order to maintain the appearance of the hydraulic excavator.

  On the other hand, in the prior art according to Patent Document 1, the side frame is attached to the center frame by welding or the like, and the front frame member is attached to the frame member using a bolt so as to be detachable. It consists of. As a result, even if a scar such as a collision mark occurs on the divided frame member, the divided frame member can be easily repaired by replacing the divided frame member with a new one and attaching it to the front frame member. .

  On the other hand, in the prior art disclosed in Patent Document 2, the corner cover is detachably attached to the front corner portion (corner corner portion) of the side frame by using a bolt, so that the corner cover collides with an obstacle and causes a collision mark or the like. Even if the dent is generated, a damaged corner portion of the side frame can be repaired by attaching a new corner cover to the corner portion of the side frame.

  However, although the prior art according to Patent Document 1 can easily attach a new divided frame member to the frame member using a bolt instead of the broken divided frame member, the frame member constituting the front side of the side frame is Since it is fixed to the center frame by welding or the like, the repair work is difficult.

  On the other hand, in the prior art disclosed in Patent Document 2, a new corner cover can be easily attached to the corner portion of the side frame using bolts instead of the damaged corner cover, but the side frame is welded to the center frame by welding or the like. Since it is fixed, when a portion other than the corner portion of the side frame is damaged, it is difficult to repair the damaged portion.

  For this reason, when the outer peripheral surface of the side frame fixed to the center frame by welding or the like causes a dent such as a collision mark, usually, for example, after cutting a damaged portion of the outer peripheral surface of the side frame, The repair work of the side frame is performed by fixing a plate material for repair to the cut portion by means such as welding. As a result, there is a problem that the number of work steps for repairing the damaged side frame increases, and the workability of the repair work is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and an object thereof is to provide a frame structure for a construction machine that can improve workability when repairing a damaged side frame.

  In order to solve the above-described problems, the present invention provides a center frame having a bottom plate and left and right vertical plates standing on the bottom plate, and left and right disposed on the left and right sides of the center frame. It is applied to the frame structure of a construction machine provided with a side frame.

  A feature of the configuration adopted by the invention of claim 1 is that the side frame includes an outer wall plate that forms an outer peripheral surface of the frame structure, and an inner wall plate that forms a closed cross-sectional space between the outer wall plate and the outer wall plate. The inner wall plate of the side frame is provided with a repair hole for repairing the outer wall plate from the inner wall plate side.

  According to a second aspect of the present invention, the side frame is formed by joining the outer wall plate having a substantially C-shaped or horizontal U-shaped cross section and the flat inner wall plate rising upward and downward. It is configured as a hollow frame body having a substantially D-shaped cross-sectional shape, and at least an upper end side of the outer wall plate is provided with a flange portion projecting inward from the upper end portion of the inner wall plate toward the center frame. It is in that.

  According to the first aspect of the present invention, even when the outer wall plate of the side frame configured as a hollow frame body collides with an obstacle or the like around the side wall, even if a dent (breakage) such as a collision mark occurs, for example, the inner wall By inserting a repair tool into the closed cross-section space of the side frame through the repair hole provided in the plate, this tool is used to knock out the dent of the outer wall plate from the inner side of the outer wall plate (inner wall plate side) for repair. be able to.

  Therefore, for example, when a dent such as a collision mark occurs in the outer wall plate, after cutting out the dent portion, the repair plate material is fixed to the cut portion by means such as welding. , Work man-hours can be reduced. As a result, workability when repairing a damaged side frame can be greatly improved.

  According to the second aspect of the present invention, by providing the flange portion projecting inward from the upper end portion of the inner wall plate toward the center frame on the upper end side of the outer wall plate, for example, rain water and washing water are provided on the upper end side of the outer wall plate. Even if it falls, the rainwater or the like can be prevented from flowing downward along the inner wall plate joined to the upper end side of the outer wall plate by the flange protruding from the inner wall plate. Thereby, rain water, washing water, etc. can be prevented from entering the side frame through the repair hole provided in the inner wall plate, and the life of the side frame can be extended.

  Moreover, when joining the upper end side of an outer wall board and the upper end part of an inner wall board by welding, a welding leg length can be increased by the part which provided the collar part. Thereby, the joint strength of an outer wall board and an inner wall board can be raised, and the intensity | strength of the whole side frame can be raised.

  Hereinafter, embodiments of the frame structure of a construction machine according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example the case of application to a swing frame of a hydraulic excavator.

  In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and turns on the lower traveling body 2 via a turning wheel 3. The upper swing body 4 is mounted in a slidable manner, and the offset boom type working device 5 is provided on the front side of the upper swing body 4 so as to be movable up and down.

  The hydraulic excavator 1 is a so-called ultra-small swing excavator, for example. When the upper swing body 4 performs a swing operation on the lower traveling body 2, the work device 5 and the upper swing body 4 are in the lower portion. It is configured to fit within the vehicle width of the traveling body 2.

  Here, the upper swing body 4 is disposed on the left side of the front portion of the swing frame 11 which will be described later as a base, the cab 6 defining the cab, and the rear end side of the swing frame 11. A counterweight 7 which is disposed and balances the weight with the working device 5; and a building cover 8 which is disposed on the front side of the counterweight 7 and accommodates equipment (not shown) such as an engine and a hydraulic pump. It is roughly constituted by.

  In addition, the work device 5 includes a lower boom 5A that is pivotally connected to the front side of a turning frame 11 described later, and an upper boom that is pivotally connected left and right to the tip side of the lower boom 5A. 5B, an arm support 5C pin-coupled to the front end side of the upper boom 5B so as to be pivotable left and right, a link rod 5D connecting the lower boom 5A and the arm support 5C, and an arm support An arm 5E that is pin-coupled to 5C so as to be able to move up and down, a bucket 5F that is pivotally coupled to the tip of the arm 5E, and a boom cylinder 5G, an offset cylinder 5H, an arm cylinder 5I, and a bucket cylinder 5J It is roughly structured.

  Reference numeral 11 denotes a revolving frame as a frame structure, and the revolving frame 11 is a base of the upper revolving structure 4. Here, as shown in FIG. 2, the revolving frame 11 is located at the center of the left and right directions and extends in the front and rear directions, which will be described later, and the left and right sides of the center frame 12. The left and right side frames 24, 32 and the like are provided, and form a strong support structure.

  Reference numeral 12 denotes a center frame that constitutes the left and right center portions of the revolving frame 11, and the center frame 12 includes a bottom plate 13, a left vertical plate 14, which will be described later, and a bottom plate that is erected on the upper left side of the bottom plate 13. 13 is composed of a left vertical plate 14 standing on the right side of the upper surface 13 and a right vertical plate 15 described later facing in the left and right directions.

  Here, the bottom plate 13 serves as a base of the center frame 12, and is formed as a substantially rectangular plate extending in the front and rear directions using a thick steel plate or the like. The left vertical plate 14 and the right vertical plate 15 are fixedly provided on the upper surface side of the bottom plate 13, and the swiveling wheel 3 is attached to the lower surface side of the bottom plate 13.

  14 is a left vertical plate erected on the left side of the upper surface of the bottom plate 13. The left vertical plate 14 extends forward and rearward on the bottom plate 13 while facing the right vertical plate 15 described later in the left and right directions. Yes. Then, the front end side of the left vertical plate 14 is a working device mounting portion 14A raised in a mountain shape from the bottom plate 13, and the rear end side of the left vertical plate 14 is a counterweight mounting portion 14B.

  Reference numeral 15 denotes a right vertical plate standing on the right side of the upper surface of the bottom plate 13, and the right vertical plate 15 extends linearly in the front and rear directions while facing the left vertical plate 14 in the left and right directions. The front end side of the right vertical plate 15 is a working device mounting portion 15A raised in a mountain shape from the bottom plate 13, and the rear end side of the right vertical plate 15 is a counterweight mounting portion 15B.

  And the base end side of the lower boom 5A which comprises the working device 5 is pin-coupled to the working device attachment parts 14A and 15A of the left and right vertical plates 14 and 15 so that the left and right vertical plates 14 and 15 can rotate. The counterweight 7 is fixed to the 15 counterweight mounting portions 14B and 15B using bolts or the like.

  Reference numeral 16 denotes a front vertical plate that is provided in an inclined state between the front end side of the left vertical plate 14 and the front end side of the right vertical plate 15, and a cylinder bracket 16 </ b> A is provided on the upper surface side of the front vertical plate 16. The bottom of the boom cylinder 5G that constitutes the work device 5 is rotatably coupled to the cylinder bracket 16A. In addition, a plurality of (for example, four) engine mounting members 17, 17,... Are disposed on the rear side of the bottom plate 13 positioned between the left and right vertical plates 14 and 15, respectively. The engine (not shown) is configured to be supported.

  Reference numeral 18 denotes a lower left plate disposed on the left front side of the bottom plate 13. The lower left plate 18 is a narrow flat plate that is curved in an arc shape when viewed from above and extends in the front and rear directions. , 21 to the left side of the bottom plate 13. A left side frame 24 described later is fixed to the upper surface side of the lower left plate 18 by welding or the like.

  Reference numeral 19 denotes a lower right plate disposed on the right front side of the bottom plate 13. The lower right plate 19 is a flat plate having a substantially trapezoidal shape when viewed from above, and is fixed to a corner corner on the right front side of the bottom plate 13 by welding or the like. ing. A right side frame 32 described later is fixed to the upper surface side of the lower right plate 19 by welding or the like.

  Reference numerals 20 and 21 denote front and rear left projecting beams which are provided so as to project leftward from the center frame 12. The front left projecting beam 20 is fixed to the bottom plate 13 by welding or the like on the front side, and the front end side is provided on the left lower plate 18. It is fixed by welding or the like. On the other hand, the rear left protruding beam 21 is configured such that the proximal end side is fixed to the bottom plate 13 and the left vertical plate 14 by welding or the like, and the distal end side is fixed to a left side frame 24 described later. Further, both left and right ends of the rear left protruding beam 21 are cab support portions 21A and 21A for supporting the rear side of the cab 6 via a mount member (not shown).

  22 and 23 are front and rear right extending beams provided to extend rightward from the center frame 12, and the front right extending beam 22 is fixed to the bottom plate 13 and the right vertical plate 15 by welding or the like on the base end side, The distal end side is fixed to a right side frame 32 described later. On the other hand, the rear right extending beam 23 is configured such that the proximal end side is fixed to the bottom plate 13 and the right vertical plate 15 by welding or the like, and the distal end side is fixed to the right side frame 32.

  Next, the left side frame 24 and the right side frame 32 which are the main parts of this Embodiment are demonstrated.

  First, 24 is a left side frame, and this left side frame 24 is arranged on the left side with the center frame 12 interposed therebetween. Here, as shown in FIGS. 2 to 4, the left side frame 24 includes a left bent frame portion 24 </ b> A that extends in the front and rear directions while being curved in an arc shape when viewed from above, and a front end of the left bent frame portion 24 </ b> A. It is generally constituted by a left front frame portion 24B joined to the portion by welding or the like and extending toward the center frame 12 in the left and right directions.

  The left bent frame portion 24 </ b> A is fixed to the lower left plate 18 and is fixed to the distal end sides of the left extension beams 20 and 21. On the other hand, the front end portion of the left front frame portion 24B joined to the left bent frame portion 24A is fixed to the bottom plate 13 of the center frame 12 or the like. A left cab support bracket 24C is disposed between the left bent frame portion 24A and the left front frame portion 24B, and a right cab support is provided between the left front frame portion 24B and the left vertical plate 14 of the center frame 12. A bracket 24D is disposed, and the front side of the cab 6 is supported by the left and right cab support brackets 24C and 24D.

  Here, the left bending frame portion 24A constituting the left side frame 24 has a substantially C-shaped, horizontal U-shaped, or substantially U-shaped cross-sectional shape as shown in FIGS. 11 has an outer wall plate 25 forming an outer peripheral surface and an inner wall plate 26 joined to the outer wall plate 25 in a flat plate shape that rises upward and downward, and has a substantially D-shaped cross-sectional shape as a whole. Is formed as a hollow frame body having a closed cross-sectional space 27. Further, both end portions in the length direction of the left bent frame portion 24A are closed.

  In this case, the outer wall plate 25 of the left bent frame portion 24A is formed by bending a thin steel plate material or the like into a substantially C shape, a horizontal U shape, or a substantially U shape, as shown in FIG. A rising surface 25A that rises upward and downward, an upper surface 25B that is bent horizontally from the upper end side of the rising surface 25A toward the inner wall plate 26, and a lower end side of the rising surface 25A toward the inner wall plate 26. The lower surface 25C is bent in the horizontal direction.

  On the other hand, the inner wall plate 26 of the left bent frame portion 24A is formed in a flat plate shape that rises vertically upward and downward using a thick steel plate material or the like made of a member different from the outer wall plate 25. As shown in FIG. 5, the upper end portion of the inner wall plate 26 is welded to the distal end side of the upper surface 25B of the outer wall plate 25, and the lower end portion of the inner wall plate 26 is welded to the distal end side of the lower surface 25C of the outer wall plate 25. Thus, a left bent frame portion 24A having a substantially D-shaped cross-sectional shape as a whole and having a closed cross-sectional space 27 formed between the outer wall plate 25 and the inner wall plate 26 is configured.

  The tip of the upper surface 25B of the outer wall plate 25 is an upper flange 25D that protrudes from the upper end of the inner wall plate 26 toward the center frame 12, and the tip of the lower surface 25C of the outer wall plate 25 is the lower end of the inner wall plate 26. The lower flange 25E protrudes from the center frame 12 side. For this reason, when the upper surface 25B of the outer wall plate 25 and the upper end portion of the inner wall plate 26 are welded, the weld leg length can be increased by the upper flange portion 25D provided at the tip portion of the upper surface 25B. When the lower surface 25C and the lower end portion of the inner wall plate 26 are welded, the weld leg length can be increased by the lower flange portion 25E provided at the front end portion of the lower surface 25C, so that the outer wall plate 25 and the inner wall plate 26 are joined. The structure can increase the strength.

  Next, the left front frame portion 24B that constitutes the left side frame 24 together with the left bent frame portion 24A also has a rising surface 28A, an upper surface 28B, a lower surface 28C, an upper flange portion 28D, and a lower flange portion, similarly to the left bent frame portion 24A. The outer wall plate 28 made of 28E and the inner wall plate 29 joined to the outer wall plate 28 form a hollow frame body having a closed cross-sectional space inside. And the both ends of the length direction of the left front frame part 24B are obstruct | occluded.

  Reference numeral 30 denotes one repair hole formed in the inner wall plate 26 constituting the left bent frame portion 24A. The repair hole 30 is, for example, an outer wall of the left bent frame portion 24A as shown by a two-dot chain line in FIG. When the plate 25 generates a dent 31 such as a collision mark or a depression mark, a tool W or the like for repairing the dent 31 is inserted and repaired from the inside of the outer wall plate 25 (inner wall plate 26 side) by the tool W. Is to be able to do.

  Therefore, for example, as shown in FIG. 5, the diameter A of the repair hole 30 is set to a value of about ½ with respect to the height dimension B of the inner wall plate 26, and the operator who performs the repair work It is configured so that a hand can be easily inserted into the closed cross-sectional space 27 between the outer wall plate 25 and the inner wall plate 26 through the hole 30.

  Further, the repair hole 30 is a portion fixed to the left lower plate 18 of the left side frame 24, that is, the left fixed to the left lower plate 18 of the left bent frame portion 24A and the left front frame portion 24B of the left side frame 24. It is formed only on the inner wall plate 26 of the bending frame portion 24A. Thereby, even when the repair hole 30 is formed in the inner wall plate 26, the strength of the left side frame 24 can be secured.

  On the other hand, the front end portion of the upper surface 25B of the outer wall plate 25 constituting the left bent frame portion 24A is an upper flange portion 25D protruding from the upper end portion of the inner wall plate 26 toward the center frame 12, and the repair hole 30 is formed on the upper flange portion. It is arranged at a position covered by 25D from above. Thereby, for example, even if rain water, washing water, or the like falls on the upper surface 25B of the outer wall plate 25, the rain water or the like flows downward from the upper surface 25B of the outer wall plate 25 along the inner wall surface 26. It is configured to be able to prevent rainwater and the like from entering the left bending frame portion 24A through the repair hole 30 provided in the inner wall plate 26, while being suppressed by the upper flange portion 25D protruding from the portion.

  Next, 32 is a right side frame, and this right side frame 32 is disposed on the right side with the center frame 12 in between. Here, as shown in FIGS. 2, 6, and 7, the right side frame 32 includes a right bending frame portion 32 </ b> A that extends in the front and rear directions while being curved in an arc shape when viewed from above, and the left bending frame portion. It is roughly constituted by a right front frame portion 32B joined to the front end portion of 32A by welding or the like and extending leftward and rightward toward the center frame 12.

  The right bent frame portion 32 </ b> A is fixed to the lower right plate 19 and is fixed to the distal end sides of the right extending beams 22 and 23. On the other hand, the front end portion of the right front frame portion 32B joined to the right bent frame portion 32A is fixed to the lower right plate 19 or the like.

  Here, the right bending frame portion 32A constituting the right side frame 32 has an outer wall plate 33 having a substantially C-shaped cross section and forming the outer peripheral surface of the revolving frame 11, as shown in FIGS. A hollow frame having a substantially D-shaped cross-section as a whole and a closed cross-section space 35 formed by an inner wall plate 34 which is formed in a flat plate shape rising upward and downward and joined to the outer wall plate 33. It is formed as a body, and both ends in the length direction are closed.

  In this case, the outer wall plate 33 of the right bending frame portion 32A is formed by bending a thin steel plate material or the like into a substantially C shape, and as shown in FIG. The upper surface 33B is bent horizontally from the upper end side of the rising surface 33A toward the inner wall plate 34, and the lower surface 33C is bent horizontally from the lower end side of the rising surface 33A toward the inner wall plate 34. It has become.

  On the other hand, the inner wall plate 34 of the right bending frame portion 32A is formed in a flat plate shape that rises vertically upward and downward using a thick steel plate material or the like made of a member different from the outer wall plate 33. The upper end portion of the inner wall plate 34 is welded to the distal end side of the upper surface 33B of the outer wall plate 33, and the lower end portion of the inner wall plate 34 is welded to the distal end side of the lower surface 33C of the outer wall plate 33. A right-bending frame portion 32 </ b> A is formed in which a closed sectional space 35 is formed between the outer wall plate 33 and the inner wall plate 34.

  Further, the front end portion of the upper surface 33B of the outer wall plate 33 is an upper flange portion 33D protruding from the upper end portion of the inner wall plate 34 toward the center frame 12, and the front end portion of the lower surface 33C of the outer wall plate 33 is the lower end portion of the inner wall plate 34. The lower flange portion 33E protrudes from the center frame 12 side. For this reason, the weld leg length between the upper surface 33B of the outer wall plate 33 and the inner wall plate 34 can be increased, the weld leg length between the lower surface 33C of the outer wall plate 33 and the inner wall plate 34 can be increased, and the outer wall plate 33 can be increased. And the inner wall plate 34 can be increased in bonding strength.

  Next, the right front frame portion 32B that constitutes the right side frame 32 together with the right bent frame portion 32A also has a rising surface 36A, an upper surface 36B, a lower surface 36C, an upper flange portion 36D, and a lower flange portion, similarly to the right bent frame portion 32A. The outer wall plate 36 made of 36E and the inner wall plate 37 joined to the outer wall plate 36 are formed as a hollow frame body having a closed section space inside, and both end portions in the length direction are closed.

  Reference numerals 38 and 38 denote two repair holes formed in the inner wall plate 34 constituting the right bent frame portion 32A. Each of the repair holes 38 has an outer wall plate 33 of the right bent frame portion 32A such as a collision mark, a depression mark, and the like. When a dent (breakage) occurs, a tool (not shown) for repairing the damaged portion is inserted, and the tool can be repaired from the inner side of the outer wall plate 33 (the inner wall plate 34 side). It is to make.

  Reference numeral 39 denotes one repair hole formed in the inner wall plate 37 constituting the right front frame portion 32B. The repair hole 39 is similar to each of the repair holes 38 described above, and the outer wall plate 36 of the right front frame portion 32B has a collision mark. When a dent such as a depression mark is generated, the damaged portion can be repaired from the inner side of the outer wall plate 36 (the inner wall plate 37 side).

  In this case, the diameter of each repair hole 38 is set to a value of about 1/2 with respect to the height dimension of the inner wall plate 34, and the diameter of the repair hole 39 is also approximately equal to the height dimension of the inner wall plate 37. The value is set to about 1/2. Each repair hole 38 is formed in the inner wall plate 34 of the right bent frame portion 32A fixed to the right lower plate 19 in the right side frame 32, and the repair hole 39 is a right front frame fixed to the right lower plate 19. Even when the repair holes 38 and 39 are formed in the inner wall plate 37 of the portion 32B, the strength of the right side frame 32 can be secured.

  On the other hand, the front end portion of the upper surface 33B of the outer wall plate 33 constituting the right bent frame portion 32A becomes an upper flange portion 33D protruding from the upper end portion of the inner wall plate 34, and each repair hole 38 is formed from above by the upper flange portion 33D. It is arranged in a covered position. Further, the tip of the upper surface 36B of the outer wall plate 36 constituting the right front frame portion 32B is an upper flange portion 36D protruding from the upper end portion of the inner wall plate 37, and the repair hole 39 is covered from above by the upper flange portion 36D. Placed in position. Thus, rainwater or the like can be prevented from entering the right bent frame portion 32A through the repair holes 38 by the upper flange portion 33D, and rainwater or the like can be prevented from entering the right front frame portion 32B through the repair holes 39. The configuration can be prevented by 36D.

  The hydraulic excavator 1 according to the present embodiment includes the revolving frame 11 as described above. The hydraulic excavator 1 self-travels to the work site by the lower traveling body 2 and then rotates the upper revolving body 4 while rotating the upper revolving body 4. By moving 5 up and down, earth and sand excavation work and the like can be performed.

  Here, when the upper swing body 4 performs a swing operation during excavation work of the hydraulic excavator 1, the outer peripheral surfaces of the left and right side frames 24 and 32 constituting the swing frame 11 exist around the hydraulic excavator 1. By colliding with an obstacle, a dent (breakage) such as a collision mark or a depression mark may occur.

  On the other hand, the revolving frame 11 according to the present embodiment is configured to improve workability when repairing the damaged left and right side frames 24 and 32. Hereinafter, the repair work will be described. The left bent frame portion 24A of the left side frame 24 will be described as an example.

  First, as the outer wall plate 25 constituting the outer peripheral surface of the left side frame 24 (left bent frame portion 24A) collides with an obstacle or the like, as shown by a two-dot chain line in FIG. The part generates a recess 31 such as a collision mark or a depression mark in a closed cross-sectional space 27 formed between the inner wall plate 26 and the inner wall plate 26.

  In this case, for example, the operator digs into the lower surface side of the revolving frame 11 and removes an under cover (not shown) that covers the revolving frame 11 from below. Then, the operator inserts a repair tool W into the closed cross-sectional space 27 through the repair hole 30 formed in the inner wall plate 26 of the left bending frame portion 24A, and the outer wall plate 25 recessed in the closed cross-sectional space 27 is inserted. The dent 31 is knocked out from the inner side (the inner wall plate 26 side) of the outer wall plate 25 by the tool W.

  In this way, the dent 31 of the outer wall plate 25 that is recessed in the closed section space 27 is hit from the inside (outer wall plate 26 side) of the outer wall plate 25 by the tool W inserted into the closed section space 27 through the repair hole 30. By taking out, the damaged outer wall plate 25 can be repaired as shown by a solid line in FIG. 5, and the appearance of the left side frame 24 can be maintained.

  Thus, according to the present embodiment, the tool W for repairing the recess 31 generated in the outer wall plate 25 is inserted into the inner wall plate 26 of the outer wall plate 25 and the inner wall plate 26 constituting the left side frame 24. A repair hole 30 is provided, and a tool for repairing a recess in the outer wall plates 33, 36 is inserted into the inner wall plates 34, 37 among the outer wall plates 33, 36 and the inner wall plates 34, 37 constituting the right side frame 32. The repair holes 38 and 39 are provided.

  Thereby, even if the outer wall plate 25 of the left side frame 24 configured as a hollow frame body collides with a surrounding obstacle or the like to form a dent 31 such as a collision mark, the outer wall plate 25 is provided on the inner wall plate 26, for example. By inserting a repair tool W into the left side frame 24 through the repair hole 30, the tool W is used to knock out the recess 31 of the outer wall plate 25 from the inner side of the outer wall plate 25 (the inner wall plate 26 side). can do.

  Similarly, even if the outer wall plates 33 and 36 of the right side frame 32 have dents such as collision marks, a tool is inserted into the right side frame 32 through the repair holes 38 and 39 formed in the inner wall plates 34 and 37. Can be repaired by knocking out the dent from the inside of the outer wall plates 33 and 36 using this tool.

  Accordingly, for example, as in the prior art, after cutting out the recessed portion of the outer wall plate, the number of work steps is reduced compared to a repair operation in which a repair plate is fixed to the cut-out portion by means such as welding. be able to. As a result, even when the left and right side frames 24 and 32 are damaged, the workability when repairing the left and right side frames 24 and 32 can be greatly improved.

  Further, according to the present embodiment, the upper end portion of the upper surface 25B of the outer wall plate 25 constituting the left bent frame portion 24A of the left side frame 24 is protruded from the upper end portion of the inner wall plate 26 toward the center frame 12 side. The front end portion of the lower surface 25C of the outer wall plate 25 is a lower flange portion 25E that protrudes from the lower end portion of the inner wall plate 26 toward the center frame 12 side.

  For this reason, for example, even if rain water, washing water, or the like falls on the upper surface 25B of the outer wall plate 25, the rain water or the like flows downward from the upper surface 25B of the outer wall plate 25 along the inner wall surface 26. It is possible to prevent rainwater or the like from entering the left side frame 24 (left bent frame portion 24A) through the repair hole 30 provided in the inner wall plate 26 by suppressing the upper flange portion 25D protruding from the portion.

  Further, when welding the upper surface 25B of the outer wall plate 25 and the upper end portion of the inner wall plate 26, the welding leg length can be increased by the upper flange portion 25D provided at the tip of the upper surface 25B. When welding 25C and the lower end portion of the inner wall plate 26, the weld leg length can be increased by the lower flange portion 25E provided at the front end portion of the lower surface 25C, so that the outer wall plate 25 and the inner wall plate 26 are joined. The strength can be increased, and the strength of the entire left side frame 24 can be increased.

  Similarly, the tip of the upper surface 33B of the outer wall plate 33 constituting the right bent frame portion 32A of the right side frame 32 is an upper flange 33D, and the tip of the lower surface 33C of the outer wall plate 33 is a lower flange 33E. In addition, the front end portion of the upper surface 36B of the outer wall plate 36 constituting the right front frame portion 32B of the right side frame 32 is an upper flange portion 36D, and the front end portion of the lower surface 36C of the outer wall plate 36 is a lower flange portion 36E.

  For this reason, it is possible to prevent rainwater or the like from entering the right side frame 32 (right bent frame portion 32A) through the repair holes 38 provided in the inner wall plate 34 by the upper flange portion 33D. Further, rain or the like can be prevented from entering the right side frame 32 (right front frame portion 32B) through the repair hole 39 by the upper flange portion 36D.

  Moreover, when the outer wall plate 33 and the inner wall plate 34 of the right bent frame portion 32A are welded, the weld leg length can be increased by the amount of the upper flange portion 33D and the lower flange portion 33E provided on the outer wall plate 33. The joining strength between the outer wall plate 33 and the inner wall plate 34 can be increased. Further, when the outer wall plate 36 and the inner wall plate 37 of the right front frame portion 32B are welded, the welding leg length can be increased by the upper flange portion 36D and the lower flange portion 36E provided on the outer wall plate 36. The bonding strength between the plate 36 and the inner wall plate 37 can be increased. Thereby, the intensity | strength of the right side frame 32 whole can be raised.

  In the above-described embodiment, the left side frame 24 is configured by welding the left bent frame portion 24A and the left front frame portion 24B, and only one repair hole 30 is provided in the inner wall plate 26 of the left bent frame portion 24A. The case where is formed is illustrated.

  However, the present invention is not limited to this, and the repair hole 41 may be provided also in the inner wall plate 29 of the left front frame portion 24B, for example, as shown by a one-dot chain line in FIG. Alternatively, a left side frame in which a left bent frame portion and a left front frame portion are integrally formed may be used, and one or a plurality of repair holes may be provided in an inner wall plate of the left side frame.

  In the above-described embodiment, the right side frame 32 is configured by welding the right bent frame portion 32A and the right front frame portion 32B, and the two repair holes 38 are formed in the inner wall plate 34 of the right bent frame portion 32A. The case where it forms and the one repair hole 39 is formed in the inner wall board 37 of the right front frame part 32B is illustrated.

  However, the present invention is not limited to this. For example, a repair hole may be provided in only one of the inner wall plates 34 and 37, and the right side frame in which the right bent frame portion and the right front frame portion are integrally formed. And one or a plurality of repair holes may be provided in the inner wall plate of the right side frame.

  Moreover, in embodiment mentioned above, the case where it applies to the turning frame 11 of the hydraulic shovel 1 provided with the offset boom type working device 5 is illustrated. However, the present invention is not limited to this, and can also be applied to a swing frame of a hydraulic excavator provided with a swing type work device, for example, as in a modification shown in FIG.

  That is, in FIG. 9, 51 is a hydraulic excavator provided with a swing type working device, and the hydraulic excavator 51 is mounted on the lower traveling body 52 and on the lower traveling body 52 so as to be capable of turning via a turning wheel 53. The upper revolving body 54 and a swing type working device 55 provided on the front side of the upper revolving body 54 are roughly configured. Here, the swing type working device 55 is provided on a swing post 57 provided on the tip side of the turning frame 56 constituting the upper turning body 54 so as to be swingable in the left and right directions. The present invention may be applied to the turning frame 56 of the excavator 51.

  Further, in the above-described embodiment, the case where the present invention is applied to the turning frame 11 of the crawler type hydraulic excavator 1 is described as an example. However, the present invention is not limited to this. For example, the present invention may be applied to a swing frame of a hydraulic excavator provided with a wheel-type lower traveling body. Further, in addition to the hydraulic excavator, it can be widely applied to frame structures of other construction machines such as a hydraulic crane, a wheel loader, and a tractor.

It is a front view which shows the hydraulic excavator provided with the turning frame by embodiment of this invention. It is a top view which shows a turning frame alone. FIG. 3 is a partially broken perspective view showing a left side frame, a left lower plate, a left overhanging beam, and the like of a turning frame. It is a disassembled perspective view which shows the left bending frame part, left front frame part, repair hole, etc. of a left side frame. It is sectional drawing which expanded the outer wall board of the left bending frame part, the inner wall board, the repair hole, etc. from the arrow VV direction in FIG. FIG. 3 is a partially broken perspective view showing a right side frame, a lower right plate, a right extension beam, and the like of a turning frame. It is a disassembled perspective view which shows the right bending frame part, right front frame part, repair hole, etc. of a right side frame. It is sectional drawing which expanded the outer wall board of the right bending frame part, the inner wall board, the repair hole, etc. from the arrow VIII-VIII direction in FIG. It is a front view of the hydraulic shovel which has a swing type working device provided with the turning frame by a modification.

Explanation of symbols

11, 56 Swivel frame (frame structure)
12 Center frame 13 Bottom plate 14 Left vertical plate 15 Right vertical plate 24 Left side frame 24A Left bending frame portion 24B Left front frame portion 25, 28, 33, 36 Outer wall plates 25A, 28A, 33A, 36A Rising surfaces 25B, 28B, 33B, 36B Upper surface 25C, 28C, 33C, 36C Lower surface 25D, 28D, 33D, 36D Upper collar part (collar part)
25E, 28E, 33E, 36E Lower heel (buttock)
26, 29, 34, 37 Inner wall plate 27, 35 Closed section space 30, 38, 39, 41 Repair hole 31 Recess W Tool

Claims (2)

A construction machine comprising: a center frame having a bottom plate and left and right vertical plates erected on the bottom plate; and left and right side frames disposed on the left and right sides of the center frame. In the frame structure,
The side frame is configured as a hollow frame body including an outer wall plate that forms an outer peripheral surface of the frame structure, and an inner wall plate that forms a closed cross-sectional space between the outer wall plate and the outer wall plate.
A frame structure for a construction machine, wherein the inner wall plate of the side frame is provided with a repair hole for repairing the outer wall plate from the inner wall plate side. The side frame has a substantially D-shaped cross-sectional shape by joining the outer wall plate having a substantially C-shaped or horizontal U-shaped cross-sectional shape and the flat inner wall plate rising upward and downward. Configured as a hollow frame body,
The frame structure for a construction machine according to claim 1, wherein a flange portion that protrudes inward from the upper end portion of the inner wall plate toward the center frame is provided on at least the upper end side of the outer wall plate.

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