JP5259470B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with a maintenance opening in a footrest portion of a floor member.

  For example, a hydraulic excavator, which is one of construction machines, is provided with a lower traveling body, an upper revolving body provided on the lower traveling body so as to be capable of swiveling, and a boom, an arm, and a work provided on the upper revolving body. And a multi-joint type working device including a tool (for example, a bucket) (see, for example, Patent Document 1). The upper revolving structure includes a revolving frame forming a support structure, a floor member provided on the revolving frame, and a driver seat attached on the floor member and seated by an operator. In addition, a footrest portion on which the operator's feet are placed is formed on the front side of the driver's seat, and a maintenance opening is formed on the footrest portion so that maintenance work of the devices arranged below the floor member can be performed. Has been. A maintenance cover is detachably attached to close the maintenance opening of the floor member.

Japanese Utility Model Publication No. 6-32271 (see FIG. 4 and the like)

  The maintenance cover described in Patent Document 1 is formed of a flat plate. Here, the maintenance cover needs to be formed with sufficient strength because the entire weight of the operator acts when the operator gets on. However, if the plate thickness is increased in order to increase the strength of the maintenance cover, the weight increases. For this reason, for example, when a maintenance operation is performed, there is a problem that it takes time and effort to attach and detach the maintenance cover. Further, although not described in Patent Document 1, a floor mat is laid so as to cover the entire footrest including the maintenance cover, and this floor mat is generally constituted by a single sheet. Therefore, for example, when performing the work of attaching and detaching the maintenance cover, there arises a problem that it takes time to remove the floor mat.

  The objective of this invention is providing the construction machine which can handle a maintenance cover and a floor mat easily at the time of a maintenance work etc., and can improve workability | operativity.

(1) In order to achieve the above object, the present invention includes a lower traveling body, an upper revolving body that is turnable on the lower traveling body, and a working device that is provided on the upper revolving body so as to be able to rise and fall. The upper revolving structure includes a revolving frame forming a support structure, a floor member provided on the revolving frame, to which a driver's seat is attached and forming an operator's footrest on a front side of the revolving frame, A maintenance opening formed in the footrest portion of the floor member so that maintenance of the devices arranged on the lower side can be performed, and a plurality of bolts are attached to the floor member so as to close the maintenance opening. It possesses a maintenance cover mounted for, and a laid floor mat as including the maintenance cover covering the footrest section of the floor member, the floor mat , Made from the front mat and rear mats are divided in the longitudinal direction, and configured such that the possible desorption operations of the maintenance cover being removed only the rear mats out of the front mat and the rear mat construction The maintenance cover includes a central folded plate having a concave-convex cross section in the front-rear direction, a left folded plate having a rising portion joined to the left side of the central folded plate, and the central folded plate. A right bent plate joined to the right side and having a rising portion, and the front mat and the rear mat have support portions that are formed on the lower surface side and arranged in a lattice shape and project downward. The lattice-shaped support portion of the rear mat is configured to cut off the central bent plate of the maintenance cover so that movement in the front-rear direction is restricted by the central bent plate of the maintenance cover. The rising portion of the left bent plate and the right bent plate are formed so as to correspond to an uneven shape, and the left and right bent plates of the maintenance cover are restricted in movement in the left-right direction. It is formed to extend between the rising portions of the right bent plate.

  (2) In the above (1), preferably, the rear mat is disposed at the rear end of the front mat so that a gap and a step between the rear end of the front mat and the front end of the rear mat do not occur. Forming a stepped portion for receiving the front end portion.

  Thereby, the clearance gap between the rear-end part of a front mat and the front-end part of a rear mat can be eliminated, and it can prevent that gravel etc. fall from the clearance gap.

  (3) In the above (1) or (2), preferably, the rear end portion of the front mat is formed in a concavo-convex shape in the left-right direction, and the front end portion of the rear mat is fitted in the left-right direction so as to be fitted thereto. It is formed in an uneven shape.

  Thereby, it is possible to prevent lateral displacement between the front mat and the rear mat, and it is possible to prevent gravel and the like from dropping from a gap caused by the displacement.

  (4) In any one of the above (1) to (3), preferably, the maintenance cover has a drainage hole penetrating in the vertical direction, and the rear mat is used for draining the maintenance cover. It has a plug portion protruding downward so as to close the hole.

  For example, when the drainage hole of the maintenance cover is not blocked, hot air heated by the heat generated by the devices arranged below the floor member may enter the cab. On the other hand, in the present invention, by closing the drainage hole with the plug portion of the rear mat, hot air can be prevented from entering, and the rear mat can be prevented from being displaced.

  According to the present invention, the maintenance cover and the floor mat can be easily handled during maintenance work or the like.

It is a side view showing the structure of the small hydraulic excavator by one Embodiment of this invention. It is a perspective view showing the detailed structure of an upper revolving structure. It is the elements on larger scale of the III section in FIG. It is a top view showing the detailed structure in the driver's cab of an upper revolving structure. It is a top view showing the state which removed the floor mat from the upper turning body shown in FIG. It is a top view showing the state which removed the maintenance cover from the upper revolving structure shown in FIG. It is a top view showing the state which removed the floor member from the upper revolving structure shown in FIG. 6, and shows the apparatus arrange | positioned under the floor member. It is a top view showing the structure of a floor member. It is a top view showing the assembly | attachment state of a floor member and a maintenance cover. It is a top view showing the assembly | attachment state of a floor member, a maintenance cover, and a floor mat. It is sectional drawing in the cross section XI-XI in FIG. It is sectional drawing in the cross section XII-XII in FIG. It is a perspective view showing the structure of a maintenance cover. It is a disassembled perspective view showing the structure of a maintenance cover. It is a top view showing the structure of a floor mat. It is an exploded plan view showing the structure of a floor mat. It is a perspective view showing the structure of the maintenance cover by the 1st modification of this invention. It is sectional drawing showing the structure of the maintenance cover by the 2nd modification of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the overall structure of a small hydraulic excavator according to an embodiment of the present invention. FIG. 2 is a perspective view showing the detailed structure of the upper swing body (however, for convenience, the illustration of the door and the floor mat is omitted), and FIG. 3 is a partially enlarged view of a portion III in FIG. In the following, when the operator is seated in the driver's seat with the excavator shown in FIG. 1, the front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (toward the paper surface in FIG. 1). The front side and the right side (the back side as viewed in FIG. 1) are simply referred to as the front side, the rear side, the left side, and the right side.

  1 to 3, a hydraulic excavator 1 includes a lower traveling body 2, an upper revolving body 4 that is turnably mounted on the lower traveling body 2 via a revolving device 3, and a support for the upper revolving body 4. A swing frame 6 constituting a structure, a swing post 33 attached to the swing frame 6 so as to be rotatable in a horizontal direction, and a swing post 33 provided on the swing post 33 so as to be rotatable in a vertical direction (can be raised and lowered). The articulated work device 5, the floor member 13 provided on the left front part on the revolving frame 6, the cab 21 that forms the cab on the floor member 13, and the revolving frame 6 other than the cab 21 The outer cover 7 is detachably attached, and the counterweight 8 is provided on the rear side of the revolving frame 6. Although not shown, an engine, a hydraulic pump, and the like are mounted on the rear side of the swing frame 6, and a fuel tank, a hydraulic oil tank, and the like are mounted on the right side of the swing frame 6. Covered with.

  The lower traveling body 2 includes a substantially H-shaped track frame 2A, left and right idler wheels 2B rotatably supported in the vicinity of the left and right front ends of the track frame 2A, and the vicinity of the left and right rear ends of the track frame 2A. The left and right drive wheels 2C supported rotatably, the left and right driving hydraulic motors (not shown) for driving the left and right drive wheels 2C, and the idler wheel 2B and the drive wheel 2C, respectively. And left and right crawler belts (crawlers) 2D. The turning device 3 is provided between the center portion of the track frame 2A and the turning frame 6, and is operated by a turning hydraulic motor 10 (see FIG. 7) described later.

  The swing post 33 is rotated left and right by a swing hydraulic cylinder (not shown) to swing the working device 5 left and right. The work device 5 includes a boom 34 that is pivotably coupled to the swing post 33, an arm 35 that is pivotally coupled to the boom 34, and a bucket 36 that is pivotally coupled to the arm 35. Yes. The boom 34, the arm 35, and the bucket 36 are operated by a boom hydraulic cylinder 37, an arm hydraulic cylinder 38, and a bucket hydraulic cylinder 39, respectively. The bucket 36 can be replaced with another work tool (for example, a breaker).

  The cab 21 is configured as a box. Specifically, a rectangular base frame 21A that is a framework of the bottom, an inverted U-shaped left pillar 21B that is erected on the left end of the base frame 21A, and a right end of the base frame 21A Are provided between the left pillar 21B and the right pillar 21C, the inverted U-shaped right pillar 21C standing upright, the intermediate pillar 21D extending in the up-down direction located in the middle of the left pillar in the front-rear direction. The left side surface portion 21G provided between the front surface portion 21E, the rear surface portion 21F, the ceiling surface portion 21J, the right side surface portion 21H provided in the frame of the right pillar 21C, and the left pillar 21B on the rear side of the intermediate pillar 21D. And have. Further, a boarding / alighting opening 21K when an operator gets on and off the cab 21 is formed between the front side of the intermediate pillar 21D and the left pillar 21B. A door 21L (see FIG. 1) is attached to the intermediate pillar 21D via a hinge so as to open and close the entrance 21K. The base frame 21A is formed by welding a steel material having an L-shaped cross section, for example, to form a rectangular frame, and a plurality of base frames 21A are overlapped on the peripheral portion of the floor member 13 (only one is shown in FIG. 3). The bolts 22 are attached.

  Next, the detailed structure of the upper swing body 4 will be described.

  FIG. 4 is a plan view showing the detailed structure of the upper revolving unit 4 in the cab (however, for convenience, the cab 21 and the air conditioning duct are not shown). FIG. 5 is a plan view showing a state where the floor mat is removed from the upper swing body 4 shown in FIG. 4, and FIG. 6 is a plan view showing a state where the maintenance cover is removed from the upper swing body 4 shown in FIG. is there. FIG. 7 is a plan view showing a state in which the floor member 13 and the like are removed from the upper swing body 4 shown in FIG. 6, and shows devices arranged on the lower side of the floor member 13. FIG. 8 is a plan view showing the structure of the floor member 13.

  As shown in FIG. 7, the revolving frame 6 includes a bottom plate 6A, a left vertical plate 6B and a right vertical plate 6C that are provided on the bottom plate 6A and extend in the front-rear direction, and the bottom plate 6A and the vertical plates 6B and 6C. The left side frame 6 </ b> D and the right side frame 6 </ b> E are located on both the left and right sides and bent in a substantially L shape. Also, a pedestal-shaped front support member 6F that is positioned on the front side of the swing frame 6 and extends in the left-right direction, and a pedestal-shaped rear support that is positioned in the middle of the swing frame 6 in the front-rear direction and extends in the left-right direction. A member 6G is provided. And as shown in FIG. 6 etc., the floor member 13 is attached via the four anti-vibration mounts 14 on the support members 6F and 6G.

  As shown in FIG. 7, a center joint 9 is provided at the turning center of the bottom plate 6 </ b> A of the turning frame 6, and a turning hydraulic motor 10 is provided in the vicinity of the center joint 9. A control valve device 11 is provided on the left side of the left vertical plate 6B of the turning frame. The center joint 9, the turning hydraulic motor 10, and the control valve device 11 are devices disposed below the floor member 13.

  The traveling hydraulic motor of the lower traveling body 2 is connected to the control valve device 11 via a center joint 9 and a hydraulic hose 12. The boom hydraulic cylinder 37, the arm hydraulic cylinder 38, the bucket hydraulic cylinder 39, the turning hydraulic motor 10, and the swing hydraulic cylinder are connected to the control valve device 11 via the hydraulic hose 12. The control valve device 11 has a plurality of hydraulic pilot spool valves that respectively control the flow of pressure oil from the hydraulic pump to the plurality of hydraulic actuators.

  Then, the corresponding hydraulic pilot type spool valves are switched by the operation of the left and right traveling operation levers / pedals 18 described later, and the left and right traveling hydraulic motors are driven. In addition, a corresponding hydraulic pilot spool valve is switched by an operation of an operation pedal 19 described later, and the swing hydraulic cylinder is driven. Also, the corresponding hydraulic pilot type spool valve is switched by the operation of a work operation lever 17 which will be described later, and the boom hydraulic cylinder 37, the arm hydraulic cylinder 38, the bucket hydraulic cylinder 39, and the turning hydraulic motor 10 are driven. It is supposed to be.

  As shown in FIG. 8, the floor member 13 is a rectangular flat plate, and the rear side portion is a driver seat mounting portion 13A. As shown in FIG. 6 and the like, a box-shaped driver seat mounting base 15 is bolted to the driver seat mounting portion 13 </ b> A of the floor member 13. The driver seat mount 15 supports a driver seat 16 on which an operator is seated, and accommodates an indoor unit or the like (not shown) of an air conditioner therein. Hot air or cold air from the indoor unit of the air conditioner is blown out, for example, toward the upper body of the operator, the feet, the front side of the operator's cab, etc. via the air conditioning duct (see FIG. 2 described above). . Further, on the left side of the driver's seat 16, a cross operation type operation control lever 17 for operating the arm 35 and the turning device 3 is provided. Further, on the right side of the driver's seat 16, a cross operation type operation control lever 17 for operating the boom 34 and the bucket 36 is provided.

  The intermediate portion to the front portion of the floor member 13 (in other words, the front portion of the driver's seat 16) is a footrest portion 13B on which the operator's feet are placed. In the front center part of the footrest portion 13B, the left and right traveling operation levers and pedals 18 (see also FIG. 2 described above) that can be operated with both hands and feet for operating the left and right traveling hydraulic motors, respectively, A pilot valve device 29 that generates an operation pilot pressure (hydraulic pressure) corresponding to the operation direction and operation amount of the travel operation lever / pedal 18 and outputs the operation pilot pressure to the control valve device 11 is provided. An operation pedal 19 for operating an optional hydraulic actuator (for example, a hydraulic motor built in a breaker mounted instead of the bucket 36) is provided on the left side of the traveling operation lever / pedal 18. . An operation pedal 19 for operating the swing post 33 is provided on the right side of the travel operation lever / pedal 18.

  As shown in FIG. 8 and the like, the left-side maintenance opening 13C and the right-side maintenance are provided in the footrest portion 13B of the floor member 13 (specifically, between the operation lever / pedal 18 for traveling and the driver seat mount 15). An opening 13D for use is formed. As shown in FIG. 6, the left maintenance opening 13 </ b> C is an opening for performing maintenance work such as the control valve device 11 and the hydraulic hose, and the right maintenance opening 13 </ b> D includes the center joint 9, the turning hydraulic motor 10, And an opening for performing maintenance work such as a hydraulic hose. As shown in FIG. 5, a maintenance cover 23 is detachably attached to the footrest portion 13 </ b> B of the floor member 13 using a plurality of bolts 28 in order to close the maintenance openings 13 </ b> C and 13 </ b> D. . Further, as shown in FIG. 4, a floor mat 43 is laid so as to cover the entire footrest portion 13 </ b> B of the floor member 13 including the maintenance cover 23. The floor mat 43 prevents the operator from slipping and prevents mud or the like falling from the operator's shoes from adhering to the floor member 13.

  Next, the structure of the maintenance cover 23 and the floor mat 43 which are the main parts of this embodiment will be described.

  FIG. 9 is a plan view illustrating an assembled state of the floor member 13 and the maintenance cover 23, and FIG. 10 is a plan view illustrating an assembled state of the floor member 13, the maintenance cover 23, and the floor mat 43. 11 is a cross-sectional view taken along section XI-XI in FIG. 10, and FIG. 12 is a cross-sectional view taken along section XII-XII in FIG. FIG. 13 is a perspective view showing the structure of the maintenance cover 23, and FIG. 14 is an exploded perspective view. FIG. 15 is a plan view showing the structure of the floor mat 43, and FIG. 16 is an exploded plan view.

  The maintenance cover 23 includes a central bent plate 24, a left bent plate 25 welded to the left side of the central bent plate, a right front side bent plate 26 welded to the right side of the central bent plate 24, and It has a right rear bent plate 27, and is configured as a three-dimensional structure having an uneven cross-sectional shape.

  The central bent plate 24 constitutes most of the maintenance cover 23, and covers most of the maintenance openings 13 </ b> B and 13 </ b> C of the floor member 13. The central bent plate 24 is a member formed as a three-dimensional structure having a concavo-convex shape by performing a substantially right-angle bending process on a substantially rectangular steel plate, for example, along a bending curve extending in the left-right direction. . Specifically, it has a flat plate portion 24A and a protruding portion 24B having a U-shaped cross section that protrudes upward from the flat plate portion 24A and extends over the entire length of the flat plate portion 24A in the left-right direction. Note that a bolt insertion hole 24C through which the bolt 28 is inserted is formed in the flat plate portion 24A located on both outer sides (in other words, the front side and the rear side) of the two protrusions 24B. Further, in the flat plate portion 24A located between the two protrusions 24B, a drainage hole 24D penetrating in the vertical direction is formed at a position corresponding to the left maintenance opening 13C of the floor member 13, for example.

  And since the protruding part 24B extended in the left-right direction acts as a high intensity | strength rib, the center bending board 24 can endure the load from an upper side, and can suppress the bending | flexion of an up-down direction.

  The left bent plate 25 is a member formed as a three-dimensional structure having a concave-convex shape by bending a single steel plate cut into a substantially rectangular shape along a folding line extending in the front-rear direction. . Specifically, a gap (between the floor member 13 and the rising plate portion 25B that is bent and raised on the right side of the flat plate portion 25A and joined to the left side surface of the central bent plate 24 (see FIG. Specifically, the overlapping plate portion 25C bent so as to be offset on the left side of the flat plate portion 25A so as to form a gap dimension substantially the same as the thickness dimension of the base frame body 21A of the cab 21, and the overlapping plate portion And a non-slip portion 25D that is bent and raised on the left side of 25C. Note that a bolt insertion hole 25E through which the bolt 28 is inserted is formed in the flat plate portion 25A. Further, a cutout 25F is formed in the overlapping plate portion 25C in order to avoid interference with the bolt 22 that fixes the base frame 21A of the cab 21 to the floor member 13 (see also FIG. 3 described above).

  And since the rising board part 25B extended in the front-back direction acts as a high intensity | strength rib, the left bending board 25 can endure the load from an upper side, and can suppress a bending in an up-down direction. In addition, the overlapping plate portion 25C and the anti-slip portion 25D also function as an uneven bending portion, which contributes to increasing the strength of the left bent plate 25.

  Also, as shown in FIG. 12, the overlapping plate portion 25C is overlapped on the base frame 21A of the cab 21 fixed to the floor member 13, so that a part of the load acting on the maintenance cover 23 is a high strength base. The member 21A can be burdened.

  Further, as shown in FIG. 3 described above, the anti-slip portion 25D located on the side of the entrance 21K of the cab 21 has a plurality of protrusions 25D1 formed by forming notches at predetermined intervals in the front-rear direction at the upper end portion thereof. Is provided. Thereby, the operator can get on and off the cab without sliding his / her foot. Further, since the non-slip portion 25 </ b> D is provided integrally with the maintenance cover 23, it can be easily attached together with the maintenance cover 23.

  The right front bent plate 26 and the right rear bent plate 27 are welded to each other to form a right bent plate. The right front bent plate 26 has a flat plate portion 26A and a rising portion 26B which is bent and raised on the left side of the flat plate portion 26A and joined to the right side surface of the central bent plate 24. Similarly, the right rear bent plate 27 has a flat plate portion 27A and a rising portion 27B which is bent and raised on the left side of the flat plate portion 27A and joined to the right side surface of the central bent plate 24. ing.

  And since the rising board part 26B extended in the front-back direction acts as a high intensity | strength rib, the right front side bending board 25 can endure the load from an upper side, and can suppress the bending | flexion of an up-down direction. Further, since the rising plate portion 27B extending in the oblique direction acts as a high-strength rib, the right rear bent plate 25 can withstand a load from the upper side and suppress vertical deflection.

  As described above, the maintenance cover 23 includes the protruding portion 24B of the central bent plate 24 extending in the left-right direction, the rising portion 25B of the left bent plate 25 extending in the front-rear direction, and the rising of the right front bent plate 26. And a rising portion 27B of the right rear bent plate 27 extending obliquely. Thereby, with respect to the load in the vertical direction, the strength is exhibited in any of the horizontal direction, the front-rear direction, and the diagonal direction, and the vertical deflection can be suppressed. Therefore, rigidity can be given to the whole in a balanced manner, and the thickness can be reduced by reducing the plate thickness.

  The floor mat 43 includes a front mat 44 and a rear mat 45 that are divided in the front-rear direction. The front mat 44 and the rear mat 45 are made of, for example, a rubber material.

  The rear mat 45 includes a horizontal surface portion 45A in which a substantially horizontal surface is formed, an inclined surface portion 45B in which an inclined surface inclined downward from the horizontal surface portion 45A toward the entrance 21K of the cab 21 is formed, It has a jetty portion 45C that is formed from the right side to the rear side of the surface portion 45A and protrudes upward. On the upper surface side of the horizontal plane portion 45A, a plurality of ridge portions 45D extending in the left-right direction are formed with a predetermined interval in the front-rear direction so as to prevent the operator from slipping.

  The front mat 44 is formed in a box-shaped pedestal portion 44A that covers the pilot valve device 29 fixed to the floor member 13, and is formed on both left and right sides of the pedestal portion 44A, and is inclined upward from the rear side toward the front side (in detail). Has an inclined surface portion 44B (inclined from the height position of the horizontal surface portion 45A of the rear mat 45 to the upper surface height position of the pedestal portion 44A) and a jetty portion 44C formed on the right side of the right inclined surface portion 44B. Yes. The pedestal 44 </ b> A of the front mat 44 is formed to be higher than the jetty 44 </ b> C of the front mat 44 and the jetty 45 </ b> C of the rear mat 45.

  An opening 44D through which the traveling operation pedal / brake 18 is inserted is formed in the pedestal portion 44A of the front mat 44. Further, an opening 44 </ b> E through which the operation pedal 19 is inserted is formed in the right inclined surface portion 44 </ b> B of the front mat 44. Further, a notch 44F through which the operation pedal 19 is inserted is formed in the left inclined surface portion 44B of the front mat 44, and a notch 45E through which the operation pedal 19 is inserted is also provided on the left side of the front end portion of the corresponding rear mat 45. Is formed. A jetty portion 44G is formed around the opening 44E and the cutout 44F of the front mat 44, and a jetty portion 45F is formed around the cutout 45E of the rear mat 45.

  Then, by forming the jetty portions 44C and 44G of the front mat 44 and the jetty portions 45C and 45F of the rear mat 45, for example, cleaning water is blown to the floor mat 21 laid on the footrest portion 13B of the floor member 13. When attached, the cleaning water is prevented from splashing around the floor mat 21. Further, the cleaning water on the rear mat 45 is guided to the entrance 21K of the cab 21 along the groove formed between the plurality of protrusions 45D, and is discharged to the outside.

  On the lower surface side of the rear mat 45, a support portion 45 </ b> G is formed that is arranged in a grid and protrudes downward so as to correspond to the cross-sectional uneven shape of the maintenance cover 23. As a result, the horizontal surface portion 45A of the rear mat 45 is maintained substantially horizontal even when a vertical load is applied. Also, on the lower surface side of the front mat 44, a support portion 44H is formed so as to be arranged in a grid and project downward. Thereby, the level | step difference of the rear-end part of the front side mat 44 and the front-end part of the rear side mat 45 is reduced. Further, a step portion 44J that receives the front end portion of the rear mat 45 is formed at the rear end portion of the front mat 44 (excluding the portion of the notch 44F). Thereby, a gap and a step between the rear end portion of the front mat 44 and the front end portion of the rear mat 45 are prevented from occurring. A substantially cylindrical plug portion 45H that protrudes downward and closes the drainage hole 24D of the maintenance cover 23 is formed on the lower surface side of the rear mat 45.

  Next, the operation in the case of performing maintenance work on the devices arranged below the floor member 23 will be described.

  First, only the rear mat 45 is removed while leaving the front mat 44, and the rear mat 45 is moved outside the cab 21 so as not to interfere with the work. Thereafter, the bolt 28 is loosened, the maintenance cover 23 is removed, and the maintenance cover 23 is moved to the outside of the cab 21 so as not to disturb the work. Then, maintenance work is performed on the devices (in detail, the center joint 9, the turning hydraulic motor 10, the control valve device 11 and the like) arranged below the floor member 23. When the maintenance work is completed, the maintenance cover 23 is attached to the floor member 13, and then the rear mat 45 is attached.

  Here, in this embodiment, since the maintenance cover 23 is a three-dimensional structure having a concavo-convex shape, the rigidity against a bending load or the like can be increased. Thereby, the weight of the maintenance cover 23 can be reduced compared with the case where it is set as the thick flat plate structure with equivalent rigidity, for example. The floor mat 43 includes a front mat 44 and a rear mat 45 that are divided in the front-rear direction, and is configured so that the maintenance cover 23 can be attached and detached with only the rear mat 45 removed. Thereby, compared with the case where it is not divided | segmented in the front-back direction, the magnitude | size of the mat | matte which must be removed when performing the removal | desorption operation | work of the maintenance cover 23 can be made small. Therefore, in the present embodiment, the maintenance cover 23 and the floor mat 43 can be easily handled at the time of maintenance work or the like, and workability can be improved.

  Further, by forming the stepped portion 44J that receives the front end portion of the rear mat 45 at the rear end portion of the front mat 44, the gap between the rear end portion of the front mat 44 and the front end portion of the rear mat 45 can be eliminated. It is possible to prevent gravel from falling through the gap. Further, as shown in FIG. 16 and the like, the rear end portion of the front mat 44 is formed in an uneven shape in the left-right direction, and the front end portion of the rear mat 45 is formed in an uneven shape in the left-right direction so as to be fitted thereto. Accordingly, it is possible to prevent the lateral displacement between the front mat 44 and the rear mat 45, and it is possible to prevent gravel and the like from dropping from the gap caused by the displacement.

  In addition, a depression of the central bent plate 24 of the maintenance cover 23 (specifically, a protrusion 24B of the central bent plate 24, a rising portion 25B of the left bent plate 25, a rising portion 26B of the right front bent plate 26, In addition, by providing the drain hole 24D in the flat plate portion 24A) surrounded by the rising portion 27B of the right rear bent plate 27, for example, cleaning water that tends to accumulate in the recess of the maintenance cover 23 during the cleaning operation of the floor member 13, etc. Can be drained. During normal operation, the drainage hole 24D of the maintenance cover 23 is closed by the plug portion 45H of the rear mat 45, so that the hot air heated by the heat generated by the devices arranged below the floor member 23 is generated in the cab. It is possible to prevent the rear mat 45 from being displaced.

  In the above-described embodiment, the central bent plate 24 of the maintenance cover 23 has been described by taking as an example a structure having two protrusions 24B extending over the entire length in the left-right direction of the flat plate portion 24A. It is not limited to this. That is, for example, like the central bent plate 32 of the maintenance cover 31 according to the first modification shown in FIG. 17, the protrusions 32B may be formed so as to be staggered on the flat plate portion 32A. Here, the number and arrangement of the protrusions are not limited to those illustrated, and can be appropriately set according to conditions such as the layout and operation mode in the cab 21.

  Further, in the above-described embodiment, the central bent plate 24 of the maintenance cover 23 has an example of a structure in which the ridge portion 24B having a U-shaped cross section (square shape) is formed so as to protrude upward from the flat plate portion 24A. However, this is not a limitation. For example, like the central bent plate 42 of the maintenance cover 41 according to the second modification shown in FIG. 18, a projecting portion 42B having a mountain-shaped cross section (triangular shape) is formed so as to protrude upward from the flat plate portion 42A. It is good. Here, the shape of the ridge portion is not limited to the exemplified one, and can be appropriately set depending on conditions such as a required strength distribution and a position on which an operator's foot is placed.

In the above-described embodiment, the maintenance cover 23 includes four members (specifically, the central bent plate 24, the left bent plate 25, the right front bent plate 26, and the right rear bent plate 27). However, the present invention is not limited to this. That is, the number of members constituting the maintenance cover can be appropriately set according to the overall shape, ease of assembly, and the like, and may be one, two, three, or five, for example. Specifically, but it may also the right front side bent plate 26 and the right rear side bent plate 27 is formed as a single member (the right bent plate). In such a case, the same effect as described above can be obtained.

  In the above description, the cab specification hydraulic excavator 1 including the cab 21 has been described as an application target of the present invention, but the present invention is not limited thereto. That is, for example, the present invention may be applied to a canopy-type hydraulic excavator provided with a canopy that covers the upper side of the driver's seat 16. Needless to say, the present invention may be applied to other construction machines such as a hydraulic crane and a wheel loader.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 4 Upper turning body 5 Working device 6 Turning frame 9 Center joint 10 Turning motor 11 Control valve device 13 Floor member 13A Driver seat mounting portion 13B Foot rest portion 13C Left side maintenance opening 13D Right side maintenance opening 16 Driver's seat 21 Cab 23 Maintenance cover 24D Drain hole 31 Maintenance cover 41 Maintenance cover 43 Floor mat 44 Front mat 44J Stepped portion 45 Rear mat 45H Plug portion

Claims (1)

A lower traveling body, an upper revolving body provided on the lower traveling body so as to be able to swivel, and a working device provided on the upper revolving body so as to be able to be raised and lowered,
The upper revolving structure includes a revolving frame that forms a support structure, a floor member that is provided on the revolving frame and that has a driver's seat and forms an operator's footrest on the front side thereof, and a lower side of the floor member A maintenance opening formed in the footrest portion of the floor member so that maintenance of the devices arranged in the floor can be performed, and the floor member can be attached and detached using a plurality of bolts so as to close the maintenance opening a maintenance cover that is attached, and a laid floor mat as including the maintenance cover covering the footrest section of the floor member possess,
The floor mat includes a front mat and a rear mat divided in the front-rear direction, and the maintenance cover can be attached and detached with only the rear mat removed from the front mat and the rear mat. configuration was a construction machine,
The maintenance cover includes a central bent plate having a concavo-convex cross section, a left bent plate joined to the left side of the central folded plate and having a rising portion, and joined to the right side of the central folded plate. Consists of a right bent plate having a rising part,
The front mat and the rear mat each have a support portion that is formed on the lower surface side and arranged in a lattice shape and projects downward.
The lattice-like support portion of the rear mat corresponds to the uneven shape of the cross section of the central folding plate of the maintenance cover so that movement in the front-rear direction is restricted by the central folding plate of the maintenance cover. Of the left bent plate and the right bent plate so that the left and right bent plates of the maintenance cover are restricted to move in the left-right direction. A construction machine, wherein the construction machine is formed to extend between the rising portion .

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