JP4291219B2 - Construction machinery - Google Patents

Description

  The present invention relates to construction of, for example, a hydraulic excavator and a hydraulic crane, and more particularly to a construction machine in which a floor plate can be tilted with respect to a frame.

  Generally, a hydraulic excavator as a construction machine is provided with a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an upside-down movable structure on the front side of the upper revolving body. And a working device.

  In addition, the upper swing body is provided on the swing frame with a swing frame having a working device attached to the front side, a counterweight attached to the rear end side of the swing frame, and a front side of the counterweight. And a driver seat on which the driver is seated, a canopy that covers the driver seat from above, a cab that surrounds the driver seat, and the like.

  By the way, the hydraulic excavator has a small hydraulic excavator called a mini excavator suitable for work in a narrow work site. In this small hydraulic excavator, there is little space for installing equipment such as a control valve and a swing motor. These devices are arranged below the floor plate in the revolving frame.

  Here, as a small hydraulic excavator according to the prior art, the front end side of the floor board is attached to the front end side of the swivel frame via the tilt support mechanism, so that the rear side of the floor board is located above the swivel frame together with the driver's seat. A device that can be tilted (tilted up) is known (for example, see Patent Document 1).

JP 2000-72048 A

  According to this conventional hydraulic excavator, a large working space can be secured between the floor plate and the swivel frame by tilting the rear side of the floor plate upward with respect to the swivel frame. It is possible to improve workability when performing maintenance work on devices such as control valves disposed on the side.

  By the way, the above-described conventional hydraulic excavator is provided with a frame cover that surrounds the periphery of the swivel frame, and the frame cover covers the devices disposed below the floor plate, thereby allowing the overall appearance of the hydraulic excavator to be covered. It is designed to enhance the aesthetics (design).

  On the other hand, since the conventional hydraulic excavator is provided with a tilt support mechanism between the front end side of the swivel frame and the front end side of the floor plate, the tilt support mechanism is covered from the front side using a cover or the like. It is necessary to ensure the design of the hydraulic excavator.

  On the other hand, for example, it is conceivable to configure the tilt support mechanism to be covered from the front side by extending a portion of the frame cover provided on the turning frame that covers the turning frame from the front side.

  However, in this case, when the floor plate is tilted with respect to the revolving frame, the front end portion of the floor plate or the canopy support column erected on the floor plate interferes with the frame cover and breaks it. There is a problem that it ends up.

  For this reason, the tilt angle of the floor plate with respect to the swivel frame is limited, and even if the floor plate is tilted, a sufficient working space cannot be secured between the rear side of the floor plate and the swivel frame, and the floor plate There is a problem in that workability when performing maintenance on the devices arranged on the lower side of the apparatus is lowered.

  The present invention has been made in view of the above-described problems of the prior art, and can cover the tilting support mechanism disposed between the frame and the floorboard, and can set the tilting angle of the floorboard relative to the frame to be large. It aims to provide a construction machine that can be used.

  In order to solve the above-described problems, the present invention provides a frame to which a working device is attached, a floor plate supported to be tiltable on the frame via a tilt support mechanism provided at a front portion of the frame, It is applied to a construction machine provided with a driver seat on which a driver is seated.

The feature of the configuration invention of claim 1 is employed, the front end of the frame is positioned below the floor plate provided frame cover for covering the frame from the front, the front end of the floor plate, located above the said frame cover, on to the floor with independent to the said frame cover, a slidable floor plate front cover provided downward, when the floorboards is fixed on the frame, The floorboard front cover is fixed at a lower end position with respect to the floorboard, covers the tilt support mechanism from the front side, and when the floorboard tilts with respect to the frame with a front side portion as a fulcrum, the floorboard front cover is The present invention is configured to avoid the interference between the floor plate front cover and the frame cover by sliding upward with respect to the floor plate .

The invention of claim 2 is such that the floorboard front cover is attached to the floorboard using a fastening member, the floorboard front cover is provided with a long hole through which the fastening member is inserted and extends upward and downward, and the floorboard front cover is fastened. By loosening the member, it is guided by the long hole and slid upward and downward.

According to the first aspect of the present invention, the floor board front cover is provided on the front end side of the floor board independently of the frame cover and slidable upward and downward with respect to the floor board. Thus, when the floor board is not tilted with respect to the revolving frame, the floor board front cover is fixed at the lower end position with respect to the floor board, and the tilting support mechanism can be covered from the front side by the floor board front cover. The aesthetics (design) of the external appearance of the excavator can be improved. In this case, since it is not necessary to extend the frame cover upward to cover the tilt support mechanism, when the floor plate is tilted with respect to the revolving frame, the floor plate front cover is slid upward with respect to the floor plate, By previously separating the floorboard front cover from the frame cover, it is possible to prevent the tilted floorboard, the floorboard front cover and the like from interfering with the frame cover. Therefore, since the tilt angle of the floor plate with respect to the swivel frame can be set large and a large work space can be secured between the floor plate and the swivel frame, the workability during maintenance for the devices arranged below the floor plate can be secured. Can be increased.

Further , according to the invention of claim 1 , since the floorboard front cover is slidably attached to the floorboard in the upward and downward direction, the floorboard is used as a fulcrum with the front side portion of the floorboard as a fulcrum during maintenance work, for example. By sliding the floorboard front cover in advance when tilting it, the floorboard front cover and the frame cover are reliably prevented from interfering without removing the floorboard front cover from the floorboard. Can do. In addition, when the maintenance work is completed and the floorboard is placed on the revolving frame, the tilting support mechanism can be covered by the floorboard front cover by sliding the floorboard front cover downward, and the appearance of the hydraulic excavator is improved. Aesthetics can be enhanced.

According to the invention of claim 2 , since the floor plate front cover is provided with a long hole extending upward and downward, and the floor plate front cover is attached to the floor plate using the fastening member inserted through the long hole, the fastening member is By loosening, the floorboard front cover can be easily slid upward and downward while being guided by the long hole.

  Hereinafter, an embodiment of a construction machine according to the present invention will be described in detail with reference to FIGS. 1 to 12 by taking a small hydraulic excavator as an example.

  In the drawing, reference numeral 1 denotes a canopy-type hydraulic excavator as a construction machine. The hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2 and an upper swing that is mounted on the lower traveling body 2 so as to be able to pivot. A work device 30 described later is provided on the front side of the upper swing body 3.

  Here, as shown in FIG. 2, the upper revolving unit 3 is formed in a substantially circular shape when viewed from above so that it can substantially turn within the vehicle width of the lower traveling unit 2. The upper swing body 3 includes a swing frame 4, an engine 8, a floor plate 16, a driver's seat 21, a canopy 23, a tilt support mechanism 24, a floor plate tilt mechanism 25, and the like, which will be described later.

  Reference numeral 4 denotes a revolving frame that serves as a base of the upper revolving structure 3, and the revolving frame 4 is firmly supported by a center frame 5, a left side frame 6, a right side frame 7, and the like described later, as shown in FIGS. It is configured as a structure.

  Reference numeral 5 denotes a center frame that constitutes the central portion of the revolving frame 4. The center frame 5 is formed in a flat plate shape and extends in a front and rear direction, and a front plate and a rear plate 5A that are erected on the upper surface side of the bottom plate 5A. A left vertical plate 5B and a right vertical plate 5C extending in the direction, and a cylindrical support bracket 5D that is provided at the front ends of the left and right vertical plates 5B and 5C and supports a swing post 30A of the working device 30 described later, Located at the front and rear intermediate portions of the bottom plate 5A, provided on the bottom plate 5A and extending to the left and right, the rear horizontal beam 5E, and the left and right vertical plates 5B and 5C are provided at the front upper ends. The front side beam 5F extends in the left and right directions in parallel with the left side frame 6 and the like. A frame-side bracket 24A of the tilt support mechanism 24 described later is attached on the front transverse beam 5F. As shown in FIG. 4, a flat under cover 5G is provided between the bottom plate 5A and the left and right side frames 6 and 7, and a control valve, which will be described later, is provided on the upper surface side of the under cover 5G. 11 etc. are arranged.

  Reference numeral 6 denotes a left side frame disposed on the left side of the center frame 5, and the left side frame 6 is formed using a cylindrical pipe material having a substantially D-shaped cross section. The left side frame 6 has a left frame portion 6A that extends in the front and rear directions while being curved in an arc shape, and is bent from the front end side of the left frame portion 6A to the right and is linearly directed toward the center frame 5. The front frame portion 6B is parallel to the front horizontal beam 5F of the center frame 5.

  Reference numeral 7 denotes a right side frame disposed on the right side of the center frame 5, and the right side frame 7 is also formed using a cylindrical pipe material having a substantially D-shaped cross section. The right side frame 7 is curved in a circular arc shape and extends in the front and rear directions, and is bent from the front end side of the right frame portion 7A to the left and linearly toward the center frame 5. It is comprised by the front frame part 7B extended in this.

  Reference numeral 8 denotes an engine mounted on the rear side of the swivel frame 4. The engine 8 is positioned horizontally on the rear side of the rear horizontal beam 5E of the swivel frame 4 and extends leftward and rightward as shown in FIG. Arranged in a state. And the engine 8 is arrange | positioned so that it may enter into the lower side of the floor board 16 mentioned later, as shown in FIG. 6 and FIG. A heat exchanger 8A such as a radiator or an oil cooler is disposed on the right side of the engine 8, and a hydraulic pump 9 driven by the engine 8 is disposed on the left side of the engine 8.

  Reference numeral 10 denotes a tank provided on the right side of the swivel frame 4. The tank 10 includes a hydraulic oil tank 10A disposed on the front side of the heat exchanger 8A and a front side of the hydraulic oil tank 10A as shown in FIG. The fuel tank 10B is arranged.

  11 is a control valve provided on the left side of the turning frame 4, and the control valve 11 is disposed on an under cover 5 </ b> G provided between the bottom plate 5 </ b> A of the turning frame 4 and the left side frame 6. The control valve 11 is connected to the hydraulic pump 9, the hydraulic oil tank 10 </ b> A, and the like, and controls supply / discharge of hydraulic oil to / from various hydraulic devices provided in the hydraulic excavator 1.

  A support member 12 is provided on the rear side of the revolving frame 4 across the engine 8, and the support member 12 constitutes a part of the revolving frame 4 and supports the rear side of a floor plate 16 described later. . Here, as shown in FIGS. 4, 6, and 7, the support member 12 is positioned above the engine 8 and extends leftward and rightward, and the support base 12 </ b> A is disposed above the engine 8. The front left column 12B, the left rear column 12C, the right front column 12D, and the right rear column 12E are generally configured.

  In this case, the left front column 12B extends obliquely downward from the left end portion of the support base 12A toward the front, and the left rear column 12C extends vertically downward from the left end portion of the support base 12A (see FIG. 6). Further, the right front column 12D extends obliquely downward toward the front from the right end of the support base 12A while being bent in a substantially L shape so as to avoid the heat exchanger 8A (see FIG. 7). Furthermore, the right rear support 12E extends vertically downward from the right end of the support base 12A (see FIG. 4). And the mounting bracket 25A of the floor board tilting mechanism 25 mentioned later is attached to the right front column 12D.

  A counterweight 13 is located on the rear side of the engine 8 and is attached to the rear end of the turning frame 4 (bottom plate 5A). The counterweight 13 is arranged in the left and right directions as shown in FIGS. By forming a convex curved shape extending in an arc shape and being attached to the rear end portion of the revolving frame 4, a weight balance with the work device 30 described later is achieved.

  14 is an outer cover provided around a canopy 23 described later. The outer cover 14 extends forward from the left end side of the counterweight 13 as shown in FIGS. The left side cover 14A reaching the intermediate portion in the rearward direction, extends from the right end side of the counterweight 13 to the front, bends to the left side from the right front end portion of the swivel frame 4, and is located near the support bracket 5D of the swivel frame 4 Right side cover 14B reaching up to, an engine cover 14C that covers and opens an inspection opening (not shown) provided in the counterweight 13, and an upper side of the right side cover 14B that is located on the right side of the canopy 23 And a tank cover 14D disposed on the main body. The exterior cover 14 covers the engine 8, the heat exchanger 8A, the hydraulic pump 9, the tank 10 and the like mounted on the revolving frame 4.

  Reference numeral 15 denotes a frame cover provided on the revolving frame 4 so as to be located below a floor plate 16 to be described later. The frame cover 15 is substantially L-shaped when viewed from above, as shown in FIGS. The front cover 14 </ b> A constituting the exterior cover 14 extends from the front end side to the front along the left side frame 6.

  Here, the frame cover 15 is also called, for example, a skirt cover, and is folded rightward from the left side surface portion 15A extending forward and rearward along the left frame portion 6A of the left side frame 6 and from the front end side of the left side surface portion 15A. The front surface portion 15B is bent and extends in the left and right directions along the front frame portion 6B of the left side frame 6. As shown in FIG. 10 and the like, the frame cover 15 extends upward and downward between the left side frame 6 and the front horizontal beam 5F of the center frame 5, and the devices such as the control valve 11 shown in FIG. The revolving frame 4 is covered from the left side and the front side.

  Reference numeral 16 denotes a floor plate provided on the left side of the revolving frame 4. As shown in FIGS. 5 to 7, the floor plate 16 has a front side portion on the front side of the revolving frame 4 via an inclination support mechanism 24 described later. The rear part is supported on the support base 12A of the support member 12 by using bolts, and is supported by the part (front transverse beam 5F) so as to be tiltable.

  Here, the floor board 16 has a flat plate shape extending in the horizontal direction, and rises upward from a rear side of the footrest board 17 and a footrest board 17 that serves as a place for a driver seated in a driver seat 21 described later. A partition plate 18, a building mounting plate 19 extending horizontally from the upper end of the partition plate 18 to which a later-described canopy 23 is mounted, and a side plate 20 rising upward from the right end side of the footrest plate 17. And is roughly composed.

  A support mechanism mounting plate 17A having an L-shaped cross-sectional shape and extending in the left and right directions is provided on the front end side of the footrest plate 17, and a tilt support described later is provided on the lower surface side of the support mechanism mounting plate 17A. A floor plate side bracket 24B of the mechanism 24 is fixed, and a screw seat 26 described later is fixed. As shown in FIGS. 6 and 7, the partition plate 18 has a horizontal driver seat support portion 18 </ b> A that supports a driver seat 21, which will be described later, and the driver seat support portion 18 </ b> A faces the upper side of the engine 8 backward. It extends toward. Further, the side plate 20 is formed in a substantially rectangular parallelepiped box shape that rises from the right end side of the footrest plate 17 along the partition plate 18, and a floor plate tilting mechanism 25 described later is provided on the upper end side of the side plate 20. A sleeve 20A for attaching the moving member 25D is fixed.

  The floor plate 16 is supported so that the support mechanism mounting plate 17A of the footrest plate 17 can be tilted on the front horizontal beam 5F of the revolving frame 4 via the tilt support mechanism 24, and the building mounting plate 19 is It is configured to be fixed to the support base 12A of the support member 12 provided on the rear side of the swivel frame 4 using bolts.

  Reference numeral 21 denotes a driver seat provided on the floor plate 16, and the driver seat 21 is supported on a driver seat support portion 18A of a partition wall plate 18 constituting the floor plate 16, as shown in FIGS. . The driver's seat 21 is seated by a driver who operates the hydraulic excavator 1, and a pair of left and right traveling control levers / pedals 22 operated by the driver are placed on the front side of the driver's seat 21. It arrange | positions in the state attached to the front part side of the board 17. FIG.

  Reference numeral 23 denotes a canopy which is provided on the floor board 16 so as to surround the driver's seat 21. The canopy 23 covers the driver's seat 21 from above. Here, as shown in FIGS. 1 and 2, the canopy 23 is formed as a four-column canopy including a left front column 23A, a left rear column 23B, a right front column 23C, a right rear column 23D, and a ceiling plate 23E.

  The left front column 23A and the right front column 23C of the canopy 23 are fixed to the support mechanism mounting plate 17A of the footrest plate 17 constituting the floor plate 16, and the left rear column 23B and the right rear column 23D of the capy 23 are the floor plate. 16 is fixed to a building mounting plate 19 that constitutes 16.

  Here, as shown in FIGS. 6 and 7, the floor plate 16, the driver's seat 21, the travel operation lever / pedal 22, the canopy 23, and the like are configured as one unit mounted on the turning frame 4. . The floor plate 16 serving as the base of the unit is supported at the front side portion of the revolving frame 4 through a tilt support mechanism 24 described later, and is tilted up in the forward or upward direction (arrow in FIG. 7). (Direction A shown) and a tilt-down direction (direction indicated by arrow B in FIG. 7) which is rearward or downward.

  Reference numerals 24 and 24 denote left and right tilt support mechanisms provided between the front part of the revolving frame 4 and the front part of the floor board 16, and the tilt support mechanism 24 is as shown in FIGS. In addition, the floor plate 16 is supported so as to be tiltable with respect to the revolving frame 4 with the front side portion as a fulcrum.

  Here, as shown in FIG. 5 and the like, the tilting support mechanism 24 constitutes a frame side bracket 24A fixed to the upper surface side of the front transverse beam 5F constituting the revolving frame 4 and a footrest plate 17 of the floor board 16. A bifurcated floor plate side bracket 24B fixed to the lower surface side of the support mechanism mounting plate 17A and sandwiching the frame side bracket 24A from the left and right directions, and extending in the left and right directions, the frame side bracket 24A and the floor plate side bracket 24B. And a connecting pin 24C that is connected to be rotatable (tiltable).

  The left and right tilt support mechanisms 24 have the connecting pin 24C as a fulcrum and the floor plate 16 is tilted forward (upward in the direction of arrow A in FIG. 7) and tilted down downward or downward. It is tilted in the direction (the direction indicated by the arrow B in FIG. 7).

  Reference numeral 25 denotes a floor board tilting mechanism which is located behind the tilt support mechanism 24 and is provided between the revolving frame 4 and the floor board 16, and the floor board tilting mechanism 25 is shown in FIGS. As shown in the figure, it is provided at the right position of the floor board 16 so as to extend forward and backward.

  Here, the floor board tilting mechanism 25 includes a mounting bracket 25A attached to the right front column 12D of the support member 12 provided on the rear side of the revolving frame 4, and a base end side that rotates upward and downward to the mounting bracket 25A. A guide rail 25B that is movably attached and extends forward with a free end as a front end, a screw shaft 25C that is rotatably attached to the guide rail 25B in an axially positioned state, and the screw shaft 25C And a moving member 25D that moves along the guide rail 25B while being screwed together. The moving member 25D is configured to be rotatably attached to a sleeve 20A fixed to the side plate 20 of the floor plate 16 shown in FIG.

  Accordingly, by rotating the screw shaft 25C of the floor plate tilting mechanism 25 from the outside, the moving member 25D is displaced forward or backward along the guide rail 25B, and the displacement of the moving member 25D in the front and rear directions is reduced. Then, it is transmitted to the floor plate 16 through the sleeve 20A and the like. Thereby, the floor board 16 is tilted together with the driver's seat 21, the canopy 23, etc., with the connecting pin 24C of the tilting support mechanism 24 as a fulcrum as shown in FIG. 7 according to the moving direction and displacement amount of the moving member 25D. It is configured to tilt in the up direction (arrow A direction) or the tilt down direction (arrow B direction).

  In the state in which the floor plate 16 is tilted up to the maximum by the floor plate tilting mechanism 25, the floor plate 16 is tilted forward by the tilt angle α with respect to the swing frame 4, as shown in FIG. A large working space for easily performing maintenance work on the engine 8, the hydraulic pump 9, the control valve 11 and the like disposed below the floor plate 16 can be secured.

  26 and 26 are left and right screw seats fixed to the support mechanism mounting plate 17A of the footrest plate 17, and the screw seats 26 are provided on the support mechanism mounting plate 17A as shown in FIGS. It is fixed to the lower surface of the front end portion using means such as welding.

  Here, each screw seat 26 is formed by screwing a female screw hole in a plate body bent in a U-shape, and its front surface projects slightly forward from the front edge of the support mechanism mounting plate 17A. Yes. The left and right screw seats 26 are for receiving bolts 28 for attaching a floor plate front cover 27 described later.

  Reference numeral 27 denotes a floor plate front cover attached to the front end side of the footrest plate 17 (support mechanism mounting plate 17A) constituting the floor plate 16, and the floor plate front cover 27 is a revolving frame as shown in FIGS. 4 is disposed above the frame cover 15 attached to 4.

  Here, as shown in FIG. 5, the floor plate front cover 27 is formed of a rectangular plate body extending left and right along the support mechanism mounting plate 17A of the footrest plate 17, and both left and right end sides are It curves in an arc shape toward the rear. Further, as shown in FIG. 10, the height dimension T1 in the upper and lower direction of the floor board front cover 27 is the height between the upper surface of the front transverse beam 5F constituting the revolving frame 4 and the upper surface of the support mechanism mounting plate 17A. It is set to be approximately equal to or slightly larger than the dimension T2.

  As shown in FIG. 10, the floor plate front cover 27 is mounted on a screw seat 26 fixed to the support mechanism mounting plate 17 </ b> A using a bolt 28 described later, so that it is substantially the same as the front surface portion 15 </ b> B of the frame cover 15. The tilt support mechanism 24 provided between the revolving frame 4 and the floor board 16 is covered from the front side in a state where a plane is formed.

  27A and 27A are long holes formed in the floor plate front cover 27 so as to be spaced apart in the left and right directions. These left and right long holes 27A are the left and right fixed to the support mechanism mounting plate 17A of the footrest plate 17. It is disposed at a position corresponding to the right screw seat 26 and extends upward and downward. The left and right elongated holes 27A are for inserting bolts 28 described later.

  Reference numeral 28 denotes a bolt as a fastening member for attaching the floor board front cover 27 to the floor board 16, and the bolt 28 is inserted into each long hole 27 </ b> A of the floor board front cover 27 through a washer 29 as shown in FIGS. 5 and 10. After that, the floor plate front cover 27 is sandwiched between the screw seats 26 by being screwed onto the screw seats 26 fixed to the floor plate 16 side.

  In this case, since the bolt 28 is inserted into the long hole 27A extending in the upward and downward directions, by loosening the bolt 28, the floor plate front cover 27 is inserted into the long hole 27A as shown in FIGS. Guided, you can slide up and down.

  When the floorboard front cover 27 is fixed at the lower end position shown in FIGS. 8 and 10, the tilt support mechanism 24 disposed between the revolving frame 4 and the floorboard 16 is covered from the front side, and the external appearance of the excavator 1 Aesthetics (design) can be improved. On the other hand, when the floorboard front cover 27 is fixed at the upper end position shown in FIGS. 9 and 11, even when the floorboard 16 is tilted (tilted up) with respect to the revolving frame 4, the floorboard front cover 27 and the frame cover 15 or the like. It has a configuration that can prevent interference.

  Reference numeral 30 denotes a swing type working device attached to the front end portion of the swing frame 4. The work device 30 includes a swing post 30A attached to the support bracket 5D of the swing frame 4 so as to be swingable left and right, and a boom. 30B, arm 30C, bucket 30D, etc. are used for excavating earth and sand.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. The hydraulic excavator 1 is self-propelled to the work place by the lower traveling body 2 and then lifts the working device 30 while turning the upper revolving body 3. By moving, excavation work such as earth and sand is performed by the working device 30.

  At this time, the floor board front cover 27 is fixed at the lower end position shown in FIGS. 8 and 10, and the tilting support mechanism 24 disposed between the revolving frame 4 and the floor board 16 by the floor board front cover 27. By covering from the front side, the aesthetics (design) of the external appearance of the hydraulic excavator 1 can be enhanced.

  Next, a case where maintenance work is performed on the excavator 1 will be described. The engine 8, the hydraulic pump 9, the control valve 11, and the like that are the objects of this maintenance work are disposed below the floor plate 16. For this reason, when performing maintenance work, it is necessary to tilt up the floor board 16 in the arrow A direction from the position shown in FIG. 6 to the position shown in FIG. 7 together with the driver's seat 21, the canopy 23, and the like.

  In this case, if the floor board 16 is tilted up with the floor board front cover 27 fixed at the lower end position shown in FIGS. 8 and 10, the floor board front cover 27 interferes with the frame cover 15 attached to the revolving frame 4. End up. For this reason, the operator loosens the bolt 28 that fixes the floor board front cover 27 at the lower end position, slides (moves) the floor board front cover 27 upward along the long hole 27A, and then attaches the bolt 28 again. By tightening, the floorboard front cover 27 is fixed to the upper end position shown in FIGS. 9 and 11.

  As a result, the floorboard front cover 27 is largely separated upward from the frame cover 15, so that even if the floorboard 16 is tilted up as described later, the floorboard front cover 27 is reliably prevented from interfering with the frame cover 15. Can do.

  In this manner, with the floorboard front cover 27 fixed at the upper end position, the operator uses a bolt or the like that fixes the building mounting plate 19 of the floorboard 16 to the support member 12 (support base 12A) of the revolving frame 4. Remove.

  Next, the operator rotates the screw shaft 25C of the floor board tilting mechanism 25 using an impact wrench or the like, and moves the moving member 25D to the tip side of the guide rail 25B. Then, the movement of the moving member 25D is transmitted to the floor plate 16 through the sleeve 20A and the like, so that the floor plate 16 is moved together with the driver's seat 21, the canopy 23 and the like with the connecting pin 24C of the tilt support mechanism 24 as a fulcrum. The rear side of the floor board 16 can be lifted up by tilting up.

  In this case, since the floor board front cover 27 is fixed in advance to the upper end position shown in FIG. 11, the floor board front cover 27 does not interfere with the frame cover 15 when the floor board 16 is tilted up. Thereby, the floor board 16 can be tilted up to the maximum by the floor board tilting mechanism 25. As shown in FIG. 7, the floor board 16 is tilted forward with respect to the turning frame 4 to the tilt angle α. A large working space can be ensured between the swing frame 4 and the revolving frame 4. As a result, the engine 8, the hydraulic pump 9, the control valve 11 and the like disposed below the floor plate 16 can be exposed to the outside greatly, and maintenance work for the engine 8 and the like can be performed in a large work space. Therefore, the workability of this maintenance work can be improved.

  Moreover, since the long hole 27A extending upward and downward is provided in the floor board front cover 27, the floor board front cover 27 is moved upward and downward along the long hole 27A simply by loosening the bolt 28 inserted into the long hole 27A. Can be moved to. For this reason, for example, the floor plate front cover 27 can be easily moved from the lower end position shown in FIG. 8 or the like to the upper end position shown in FIG.

  Next, after the maintenance work for the engine 8 or the like is completed, the screw shaft 25C of the floor plate tilting mechanism 25 is rotated in the reverse direction, so that the floor plate 16 is moved together with the driver's seat 21, the canopy 23, etc. It is possible to tilt down from the position shown in FIG. 6 to the position shown in FIG. Then, as shown in FIG. 6, the floor plate 16 can be fixed on the revolving frame 4 by fixing the building mounting plate 19 of the floor plate 16 to the support base 12 </ b> A of the support member 12 using bolts.

  After the floor plate 16 is fixed on the revolving frame 4, the bolt 28 fixing the floor plate front cover 27 at the upper end position is loosened, and the floor plate front cover 27 is moved downward along the long hole 27A. Then, the bolt 28 is tightened again. Thereby, the floorboard front cover 27 can be fixed to the lower end position shown in FIG. 8 and the like, and the tilting support mechanism 24 disposed between the revolving frame 4 and the floorboard 16 is secured by the floorboard front cover 27. Can be covered from the front side.

  Also in this case, the floor plate front cover 27 fixed at the upper end position can be slid downward along the long hole 27A simply by loosening the bolt 28, so that the floor plate front cover 27 is not removed from the floor plate 16. It can be easily moved to the lower end position.

  Thus, according to the present embodiment, the floor plate front cover 27 is provided on the front end side of the floor plate 16 independently of the frame cover 15 attached to the revolving frame 4. Thereby, the tilt support mechanism 24 disposed between the revolving frame 4 and the floor board 16 can be covered from the front side by the floor board front cover 27, and the aesthetics (design) of the external appearance of the hydraulic excavator 1 is improved. be able to.

  Further, a long hole 27A extending upward and downward is provided in the floor board front cover 27, and the floor board front cover 27 is slidably attached to the floor board 16 so as to be slidable upward and downward along a bolt 28 inserted through the long hole 27A. It is configured.

  Thus, for example, when the floor plate 16 is tilted up with respect to the revolving frame 4 at the time of maintenance work, the floor plate front cover 27 is moved upward in advance without removing the floor plate front cover 27 from the floor plate 16. It is possible to reliably prevent the floor plate front cover 27 and the frame cover 15 from interfering with each other.

  For this reason, the inclination angle α of the floor plate 16 with respect to the revolving frame 4 can be set large, and a large work space can be secured between the floor plate 16 and the revolving frame 4. The workability during maintenance of the engine 8, the hydraulic pump 9, the control valve 11, etc. can be improved.

  In the above-described embodiment, the canopy-spec hydraulic excavator 1 in which the canopy 23 is mounted on the floor plate 16 is described as an example of the construction machine. However, the present invention is not limited to this, and may be applied to a cab-type hydraulic excavator provided with a cab 31 that covers the periphery of a driver's seat on a floor board, for example, as in a modification shown in FIG. In this case, the floor plate front cover 27 ′ can be attached to the lower end side of the front plate 31 A constituting the cab 31 by using the bolts 28 so as to be slidable upward and downward.

  In the above-described embodiment, the crawler type hydraulic excavator 1 is exemplified as the construction machine. However, the present invention is not limited thereto, and is widely applied to other construction machines such as a wheel type hydraulic excavator and a hydraulic crane. be able to.

1 is a front view showing a canopy-type hydraulic excavator to which an embodiment of the present invention is applied. It is the top view which looked at the hydraulic excavator from the upper part. It is a disassembled perspective view which shows the turning frame and frame cover of a hydraulic excavator. It is a top view which shows the state which has arrange | positioned an engine, a control valve, etc. to the turning frame of a hydraulic excavator. It is a disassembled perspective view which shows a floor board, a tilting support mechanism, a floor board front cover, etc. It is a front view which shows the upper revolving body which removed the exterior cover and the frame cover. FIG. 7 is a front view of the upper-part turning body in a state where the floor board, the canopy and the like are tilted up by the floor board tilting mechanism from the same position as in FIG. 6. It is a left view which expands and shows the upper turning body in FIG. 1 in the state which fixed the floor-plate front cover to the lower end position. FIG. 9 is a left side view similar to FIG. 8 showing the upper swing body with the floorboard front cover fixed to the upper end position. It is an expanded sectional view which looked at a turning frame, a frame cover, a floor board, a floor board front cover, etc. from the arrow XX direction in FIG. It is the expanded sectional view which looked at the state which fixed the floor board front cover to the upper end position, and tilted up the floor board from the same position as FIG. It is the same front view as FIG. 1 which shows the modification which attached the floor-plate front cover to the hydraulic excavator of a cab specification.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 4 Turning frame 5 Center frame 5F Front cross beam 6 Left side frame 7 Right side frame 15 Frame cover 16 Floor plate 17 Footrest plate 17A Support mechanism mounting plate 18 Bulkhead plate 18A Driver seat support portion 21 Driver seat 23 Canopy 24 Tilt Support Mechanism 25 Floor Plate Tilt Mechanism 26 Screw Seat 27, 27 'Floor Plate Front Cover 27A Long Hole 28 Bolt (fastening member)
30 working equipment 31 cab

Claims (2)

A frame on which a work device is mounted, a floor plate supported to be tiltable on the frame via a tilt support mechanism provided at a front portion of the frame, and a driver seated on the floor plate. In a construction machine comprising a seat,
Provided on the front end side of the frame is a frame cover that is located below the floor plate and covers the frame from the front side;
The front end of the floor plate, positioned above the said frame cover, on to the floor as well as independently slidable floor plate front cover downward provided the previous SL frame cover,
When the floorboard is fixed on the frame, the floorboard front cover is fixed at a lower end position with respect to the floorboard, and covers the tilt support mechanism from the front side,
When the floorboard tilts with respect to the frame with a front portion as a fulcrum, the floorboard front cover is slid upward with respect to the floorboard to avoid interference between the floorboard front cover and the frame cover ; Construction machine characterized by that. The floor board front cover is configured to be attached to the floor board using a fastening member, the floor board front cover is provided with a long hole through which the fastening member is inserted and extends downward, and the floor board front cover includes the fastening member. The construction machine according to claim 1, wherein the construction machine is configured to slide upward and downward while being guided by the elongated hole by loosening a screw.

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