JP4704858B2 - 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 in which a boom of a working device is positioned on the right side of a floor member and supported by a frame.

  In general, a hydraulic excavator as a construction machine includes a small hydraulic excavator called a mini excavator suitable for work in a narrow work site. This small hydraulic excavator is composed of a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a work device that is provided on the upper revolving body so as to be able to move up and down. ing.

  The upper swing body of the excavator is attached to the swing frame that forms a support structure, the engine mounted on the rear side of the swing frame, and the rear end portion of the swing frame that is located on the rear side of the engine. A counterweight, a floor member provided on the left side of the revolving frame located on the front side of the engine, a driver seat on which the operator is seated, and an upper portion of the driver seat A building such as a canopy and a cab, and an exterior cover that is located on the right side of the building and is provided on a revolving frame and covers a fuel tank, a hydraulic oil tank, and the like are roughly configured.

  On the other hand, there are two types of small-sized hydraulic excavators, called swing-type hydraulic excavators and mono-boom-type or offset-type hydraulic excavators. Here, the swing-type hydraulic excavator is provided with a swing post at the front end portion of the swing frame, and a boom foot portion of the work device is provided on the swing post so that the boom foot portion can be moved up, down, left, and right. Is arranged in front of the driver's seat (see, for example, Patent Document 1).

  On the other hand, mono-boom type or offset-type hydraulic excavators are provided with a boom foot part of the work device that can be moved up and down on the front side of the left and right vertical plates constituting the revolving frame. It arrange | positions at the right side of a seat (for example, refer patent document 2).

Japanese Patent Laid-Open No. 10-331657 JP-A-9-209401

  These small excavators, called mini excavators, need to organize the upper swing body in a compact manner so that the upper swing body can turn in a narrow work site. It is formed in a circular shape so as to be almost contained within. Further, when the size of the upper swing body is reduced, the swing frame is also reduced, so that a space for installing devices such as an engine and a control valve is reduced on the swing frame. For this reason, in the small hydraulic excavator, devices such as an engine and a control valve are disposed using the space below the floor member. However, if devices such as an engine and a control valve are arranged below the floor member, it is difficult to reach when performing maintenance work, inspection work, etc., and visual observation becomes difficult.

  Therefore, the small hydraulic excavator is moved up and down on the rear side with the floor member as a support point so that maintenance work and inspection work can be performed on equipment such as engines and control valves installed on the lower side of the floor member. Some are configured to perform tilting operation (tilt up, tilt down) (see, for example, Patent Document 3, Patent Document 4, and Patent Document 5).

JP-A-6-320962 JP 2000-72048 A International Publication No. WO2005 / 025968 Pamphlet

  By the way, the hydraulic excavator by patent invention 5 among the patent documents 3-5 mentioned above is a swing type hydraulic excavator, Comprising: The floor member to which the driver's seat and the building were attached is arrange | positioned on a turning frame, Work apparatus Is located in front of the driver's seat. A tilt mechanism for tilting up and down the floor member is disposed on the right side of the floor member.

  Here, the tilt mechanism includes a guide rail that extends forward and rearward along the right side surface of the building and is swingably attached to the revolving frame with the rear end side in the length direction as a swing fulcrum. The moving member is provided in the middle part and attached to the floor member, and the operation unit is provided on the distal end side in the length direction and moves the moving member to tilt the floor member. In this case, the tilt mechanism is arranged with the tip side facing downward so that an operator can stand on the ground and operate the operation unit.

  As described above, since the working device is disposed in front of the driver's seat, the swing hydraulic excavator can secure a space for disposing the tilt mechanism on the right side of the floor member. Thereby, the tilt mechanism can operate the operation unit by an operator standing on the ground without being obstructed by the boom or the like of the work device.

  However, since the working device is disposed on the right side of the driver's seat in the mono boom type or offset type hydraulic excavator, there is only a slight gap between the right side portion of the floor member and the boom foot of the working device. For this reason, if an attempt is made to provide a tilt mechanism similar to Patent Document 5 in a mono-boom type or offset-type hydraulic excavator, the operation part of the tilt mechanism disposed downward will enter the gap between the floor member and the boom foot. There is a problem that it is difficult to provide this tilt mechanism in a mono boom type or offset type hydraulic excavator.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a floor member, a boom of the working device, and a boom of the working device even in the case of a construction machine in which the boom of the working device is arranged on the right side of the floor member. Another object of the present invention is to provide a construction machine in which a tilt mechanism can be disposed in the gap, and an operation unit of the tilt mechanism can be operated from above the boom of the work device.

  A construction machine according to the present invention includes a bottom plate, a frame having left and right vertical plates erected on the bottom plate, a boom and an arm rotatably supported by the boom, and a foot portion of the boom. A working device positioned on the front side of the left and right vertical plates and supported so as to be able to move up and down; and a floor member located on the left side of the boom of the working device and provided on the frame. .

In order to solve the above-described problem, the feature of the configuration of the invention of claim 1 is that the floor member is configured to be tiltably supported on the frame with the front side as a support point. Between the boom and the floor member, there is disposed a tilt mechanism that extends in the front and rear directions and tilts the floor member up and down around the support point. The tilt mechanism has a rear end in the length direction. A swing fulcrum mounted on the frame so as to be swingable, a moving fulcrum provided in the middle of the length direction and attached to the floor member, and the movement provided on the front end side in the length direction And an operation part that tilts the floor member by moving a fulcrum, and the operation part of the tilt mechanism is arranged at a height position where the boom and the arm can be operated in a folded state in a transport posture. It lies in the fact was.

According to a second aspect of the present invention, the tilt mechanism includes a guide rail that is attached to the frame so that the rear end side can swing upward and downward as the swing fulcrum, and the front end side is a free end and extends forward. A tip portion extending along the guide rail serves as the operation portion, and a screw shaft that is rotatably attached in a state of being positioned in the length direction of the guide rail, and is rotatably attached to the floor member side. A moving member that serves as a moving fulcrum that moves forward and backward along the guide rail in a state of being screwed to the screw shaft, and the moving member is positioned higher than the rear end side of the guide rail. The arrangement is such that the guide rail is inclined upward toward the distal end side.

According to a third aspect of the present invention, an engine is provided on the rear side of the frame, and a support member that supports the rear side of the floor member is provided across the engine, and the support member is provided with the tilt mechanism. The bracket for supporting the rear end side so as to be swingable is provided at a position higher than the engine.

According to invention of Claim 4 , the bracket of the said supporting member exists in the position which becomes the right outer side of the said floor member.

According to the invention of claim 5 , the rear end side of the tilt mechanism is connected to the bracket of the support member using a connection pin so as to be swingable, and the bracket and the connection pin are connected to the rear end side of the tilt mechanism. In other words, a cover that covers the vicinity of the device is detachably provided.

According to the first aspect of the present invention, when the floor member is tilted up, the construction machine is stabilized by taking the transport posture in which the boom is lowered forward while folding the arm of the working device to the front side (boom side). Let In this state, the operator operates the operation unit provided on the tip side of the tilt mechanism to move the moving fulcrum attached to the floor member to the tip side. At this time, the operation unit of the tilt mechanism is positioned higher than the upper surface of the boom in a state in which the boom and the arm are folded in the transportation posture. Without being disturbed by the boom, it is possible to easily operate the operation unit from the upper side of the boom of the working device with an easy posture.

  As a result, even when only a narrow gap can be formed between the boom and the floor member, such as a construction machine equipped with a mono-boom type or offset type working device, the tilt mechanism arranged in this gap has its operation part Therefore, the operation portion can be easily and reliably operated, and workability when the floor member is tilted can be improved.

According to the invention of claim 2 , the moving member can be moved along the guide rail by rotating the screw shaft by the operating portion. At this time, the floor member can be tilted up by moving the moving member toward the distal end side of the guide rail away from the swing fulcrum.

  Here, since the guide rail is inclined upward toward the front end side so that the moving member (moving fulcrum) is higher than the rear end side (swinging fulcrum), the moving member tilts up on the rear side of the floor member. It is possible to move to the upper side or the front side which is almost the same as the direction of the movement. Therefore, the force for moving the moving member with the screw shaft can be efficiently applied as the force for tilting up the floor member.

  In addition, since it is inclined upward so that the front end side is higher than the rear end side of the guide rail, for example, by riding on the boom of the working device, it is easy to move from the upper side of the boom to the operating portion of the screw shaft A hand can be extended and operativity can be improved. Furthermore, since the screw shaft is used to move the moving member, the moving member can be moved along the guide rail by rotating the screw shaft. Thereby, the tilt angle of the floor member can be arbitrarily set by adjusting the rotation amount of the screw shaft.

According to the invention of claim 3 , the support member is provided on the rear side of the frame so as to straddle the engine, and the bracket for supporting the rear end side of the tilt mechanism is provided on the support member. It can be attached to the support member at a position higher than the engine. Thus, the rear end side of the tilt mechanism can be attached so as to be swingable upward and downward using the bracket of the support member, and the assembling workability of the tilt mechanism can be improved. Moreover, since the rear end side of the tilt mechanism is mounted at a position higher than the engine, it is easy to reach and the tilt mechanism can be easily attached and removed.

According to the invention of claim 4 , since the rear end side of the tilt mechanism is arranged at a position higher than the engine on the right outside of the floor member, the rear end side of the tilt mechanism is arranged at a position that can be reached from the outside. can do. As a result, when the tilt mechanism is attached and removed, it is possible to easily reach the rear end side of the tilt mechanism to work, and the workability of the tilt mechanism assembly work, maintenance work, etc. can be improved. .

According to the fifth aspect of the present invention, when the cover is attached to the rear end side of the tilt mechanism, the bracket and the connection pin of the support member can be covered by the cover, so that the connection pin is protected from mischief. Can do. On the other hand, since the connecting pin can be exposed by removing the cover, it is possible to easily perform the attaching operation and the removing operation of the tilt mechanism. Thereby, it is possible to prevent a situation where the tilt mechanism is inadvertently removed while improving workability such as assembly work and maintenance work, and to improve reliability.

  Hereinafter, a construction machine according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 15 by taking an offset hydraulic excavator with a canopy specification as an example.

  In FIG. 1, reference numeral 1 denotes a canopy-spec offset hydraulic excavator. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and an upper revolving body mounted on the lower traveling body 2 so as to be pivotable. 3 and an offset type working device 4 provided on the front side of the upper swing body 3 at a middle position between the left and right so as to be able to move up and down.

  Here, the working device 4 includes a lower boom 4A in which a foot part 4A1 on the base end side is supported by front vertical plates 5B and 5C of a revolving frame 5 which will be described later, and a left and right direction at the distal end of the lower boom 4A. The upper boom 4B is swingably connected to the front end of the upper boom 4B, the arm support member 4C is swingably connected to the front end of the upper boom 4B in the left and right directions, and the upper end of the arm support member 4C is rotated upward and downward. The arm 4D is movably connected, a bucket 4E rotatably attached to the tip of the arm 4D, a boom cylinder 4F, an arm cylinder 4G, and a bucket cylinder 4H. In addition, a link mechanism 4J that always holds the arm 4D parallel to the lower boom 4A is provided between the tip of the lower boom 4A and the arm support member 4C.

  Further, the lower boom 4A of the work device 4 is pivoted upward, downward, forward, or rearward in the pin holes 5B1, 5C1 of the left and right front vertical plates 5B, 5C of the revolving frame 5 described later. Pin-coupled as possible.

  Then, the work device 4 translates (offsets) the arm 4D in the left and right directions with respect to the lower boom 4A, and rotates the arm 4D and the bucket 4E while moving the lower boom 4A up and down in this state. Etc. can be excavated.

  In addition, as shown in FIGS. 1 and 2, the working device 4 is suitable for transportation by folding the bucket 4E and the arm 4D so as to be held in front, and lowering the lower boom 4A etc. to the front side. A stable posture (hereinafter referred to as a transportation posture) can be taken. This transport posture is used to stabilize the excavator 1 even when the floor member 9 and the like are tilted up by a tilt mechanism 20 described later. Furthermore, in a state where the working device 4 is in the transport posture, the tilt mechanism 20 can be operated on the upper side of the lower boom 4A.

  Further, as shown in FIG. 3, the working device 4 takes a turning posture for turning with a small radius by raising the lower boom 4A or the like upward or rearward while holding the bucket 4E and the arm 4D. be able to. At this time, the tilt mechanism 20 to be described later has the operation portion 24B of the screw shaft 24 disposed in front of the lower boom 4A.

  On the other hand, as shown in FIG. 4, the upper turning body 3 is formed in a substantially circular shape when viewed from above so that it can turn substantially within the vehicle width of the lower traveling body 2. The upper swing body 3 includes a swing frame 5, an engine 6, a hydraulic pump, a control valve (not shown), a floor member 9, a driver's seat 14, a canopy 17, a floor support mechanism 18, a tilt mechanism 20, A protective cover 26, a hydraulic oil tank 27, a fuel tank 28, and the like are included.

  Reference numeral 5 denotes a turning frame constituting a support structure of the upper turning body 3. As shown in FIGS. 5, 6, etc., the swivel frame 5 is located at the middle between the bottom plate 5A extending in the front and rear directions at the center and the left and right directions of the bottom plate 5A. Left front vertical plate 5B extending in the direction, right front vertical plate 5C standing in parallel on the right side of the left front vertical plate 5B, and a rear end portion of each front vertical plate 5B, 5C. A horizontal plate 5D extending in the left and right directions, a left rear vertical plate 5E extending from the left side of the horizontal plate 5D to the rear side, and a right erected in parallel on the right side of the left rear vertical plate 5E Rear vertical plate 5F, arc-shaped left guard member 5G provided on the left side, arc-shaped right guard member 5H provided on the right side, and work provided at the front position between the front vertical plates 5B and 5C. A boom cylinder bracket 5J to which the boom cylinder 4F of the device 4 is attached is generally configured. Further, the left and right front vertical plates 5B and 5C located on the front side of the left and right vertical plates are provided with pin holes 5B1 and 5C1 to which the foot portion 4A1 of the lower boom 4A of the work device 4 is attached so as to be able to move up and down. It has been.

  Further, a floor support plate 5K extending in the left and right directions is provided above the front portion of the left guard member 5G, and the floor support plate 5K has a front portion of the floor member 9 via a floor support mechanism 18 described later. Is pivotally mounted. A support member 7 is attached to the rear side of the revolving frame 5 so as to straddle an engine 6 described later.

  Reference numeral 6 denotes an engine (see FIGS. 5, 7, and 8) mounted on the rear side of the revolving frame 5, and the engine 6 is disposed in a horizontally placed state extending in the left and right directions. A hydraulic pump (not shown) driven by the engine 6 is provided on the left side of the engine 6. Here, the engine 6 is arranged in the front side so as to enter the lower side of the floor member 9 in a state where a floor member 9 described later is supported by the support member 7. Thereby, the installation space on the revolving frame 5 is used effectively, and the upper revolving structure 3 is reduced in size.

  Reference numeral 7 denotes a support member fixed to the rear side of the revolving frame 5, and the support member 7 constitutes a part of the revolving frame 5. Also. The support member 7 is attached to the rear side of the turning frame 5 so as to straddle the engine 6 in order to support the rear side of a floor member 9 described later. As shown in FIGS. 8 and 11, the support member 7 is positioned above the engine 6 and extends left and right, and supports the rear building mounting plate 12 </ b> D of the floor member 9 from below. And a plurality of, for example, four columns 7B, 7C, 7D, and 7E that support the base 7A above the engine 6, and the lower ends of the columns 7B, 7C, 7D, and 7E are respectively It is attached to the swivel frame 5.

  Further, a pair of guide rail mounting brackets 7F and 7G are provided on the front side of the base 7A at a position on the right outside of the floor member 9. Each of the guide rail mounting brackets 7F and 7G has pin holes 7F1 and 7G1 protruding forward in the left and right directions and penetrating in the left and right directions as shown in FIG. A screw hole 7G2 is formed in the right bracket 7G, and a bolt 23 for fixing a flange portion 22A of the connecting pin 22 described later is screwed into the screw hole 7G2.

  Reference numeral 8 is a counterweight (see FIGS. 1 to 4) which is located on the rear side of the engine 6 and is attached to the rear end portion of the revolving frame 5. The counterweight 8 balances the weight with the work device 4. Thus, it has a convex curved shape extending in an arc shape in the left and right directions.

  Reference numeral 9 denotes a floor member, and the floor member 9 is located on the left side of the revolving frame 5 and located on the front side of the engine 6. The floor member is disposed on the left side of the lower boom 4A of the work device 4 with the left front vertical plate 5B interposed therebetween. The floor member 9 is configured to be tiltable up and down (can be tilted) with the front portion as a support point. Further, as shown in FIGS. 12 and 13, the floor member 9 is roughly constituted by a footrest plate 10, a lever / pedal mounting plate 11, a driver seat base 12, a connection bracket 13 and the like which will be described later.

  Reference numeral 10 denotes a footrest laid on the feet of an operator seated on a driver's seat 14 described later. The footrest plate 10 is formed in a substantially rectangular shape elongated in the left and right directions, and the left side thereof is formed in an arc shape.

  Reference numeral 11 denotes a lever / pedal attachment plate attached to the front end of the footrest plate 10. The lever / pedal mounting plate 11 is formed as a plate extending in the left and right directions, and a travel lever / pedal 15 described later is mounted thereon. Further, a front building attachment plate 11A is attached to the front end of the lever / pedal attachment plate 11, and a front portion of a canopy 17 described later is attached to the front building attachment plate 11A.

  Reference numeral 12 denotes a driver seat base that is provided on the rear side of the footrest plate 10 and supports the driver seat 14. The driver seat pedestal 12 is formed in a step shape in which the rear side becomes higher in order to allow the engine 6 and the like to enter the lower side thereof. The driver seat base 12 includes a rising wall 12A that rises from the rear side of the footrest plate 10, a driver seat support plate 12B that extends rearward from the upper end of the rising wall 12A, and a rear side of the driver seat support plate 12B. A back plate portion 12C extending obliquely upward from the end, a rear building mounting plate 12D projecting rearward from the upper end portion of the back plate portion 12C, and a rear side from the right front position of the driver seat support plate 12B It is generally configured by an inclined plate 12E extending obliquely toward the right front end of the building mounting plate 12D.

  Here, the rear building mounting plate 12 </ b> D is detachably bolted to the base 7 </ b> A of the support member 7 attached to the rear side of the revolving frame 5. A rear portion of a canopy 17 described later is attached to the upper side of the rear building attachment plate 12D. Furthermore, since the inclined plate 12E is for attaching a moving member 25 of the tilt mechanism 20 described later, it is formed with sufficient strength to support the weight when the floor member 9 is tilted up.

  Reference numeral 13 denotes a connection bracket provided on the inclined plate 12E of the driver seat base 12 constituting the floor member 9. The connection bracket 13 is formed as a triangular strength member that protrudes from the front side to the upper side, and a sleeve 13A is inserted into the distal end side so as to penetrate in the left and right directions. And as shown in FIG. 14, the connection bracket 13 supports the moving member 25 of the tilt mechanism 20 in the sleeve 13A so that rotation is possible.

  Reference numeral 14 denotes a driver seat (see FIGS. 2 and 7) provided on the driver seat base 12 of the floor member 9, and the driver seat 14 is seated by an operator. A traveling lever / pedal 15 is disposed on the front side of the driver's seat 14, and a working lever 16 (only the right side is shown) is disposed on both the left and right sides of the driver's seat 14.

  Reference numeral 17 denotes a canopy as a building provided on the floor member 9, and the canopy 17 is disposed on the left side of the lower boom 4 </ b> A of the working device 4 with the left front vertical plate 5 </ b> B interposed therebetween. The canopy 17 covers the upper side and the right side of the driver's seat 14. Further, the canopy 17 is provided between the driver's seat 14 and the work device 4 so as to stand upright from the right side portion 17A covering the driver's seat 14 from the right side, and extends from the upper end side of the right side portion 17A to the left side. The upper surface portion 17 </ b> B is generally configured. Further, the canopy 17 has a right front pillar 17C, a left rear pillar (not shown), and a right rear pillar 17D. The canopy 17 has a front right pillar 17C as a front part attached to the front building attachment plate 11A of the lever / pedal attachment plate 11 constituting the floor member 9, and a left rear pillar and a right rear pillar 17D as rear parts. The driver seat base 12 is attached to the rear building mounting plate 12D.

  Reference numeral 18 denotes two sets of floor support mechanisms (only the right side is shown in FIG. 8) provided as support points on the front side of the revolving frame 5. The floor support mechanism 18 supports the front portion of the floor member 9 to be tiltable at the front end portion of the revolving frame 5 and is arranged to be separated in the left and right directions. Each floor support mechanism 18 is attached to a support base 18A attached to the floor support plate 5K of the revolving frame 5 and the front building attachment plate 11A of the lever / pedal attachment plate 11 so as to sandwich the support base 18A. A pair of mounting brackets 18B (shown only on the right side) and pins 18C that rotatably connect the mounting brackets 18B to the support base 18A are roughly configured.

  Thereby, as shown in FIG. 15, each floor support mechanism 18 tilts the floor member 9 and the canopy 17 upward or frontward or tilts down or downwards around the pin 18C. can do.

  Reference numeral 19 denotes an exterior cover provided on the right side of the swivel frame 5. The exterior cover 19 is located on the right side of the right front vertical plate 5C of the swivel frame 5, and the rear side extends to the counterweight 8, as shown in FIG. Has been. The exterior cover 19 covers a later-described hydraulic oil tank 27, fuel tank 28, and the like mounted on the right side of the revolving frame 5.

  Next, reference numeral 20 denotes a tilt mechanism according to the present embodiment, and the tilt mechanism 20 is disposed between the lower boom 4 </ b> A of the work device 4 and the floor member 9. Here, in the small swing hydraulic excavator 1 provided with the offset type work device 4, it is difficult to secure a space between the lower boom 4A of the work device 4 and the floor member 9, and the tilt mechanism 20 is disposed at this position. In such a case, the lower boom 4A, the exterior cover 19 and the like are in the way, making operation difficult.

  However, the tilt mechanism 20 according to the present embodiment tilts down the floor member 9 and the canopy 17 as shown in FIGS. 1, 2, and 7 so that an operation portion 24B of the screw shaft 24 described later can be easily operated. In this state, the operation unit 24B is placed in a position higher than the lower boom 4A of the working device 4 in the transporting posture with the operation unit 24B lying on the front side. Further, as shown in FIG. 3, the tilt mechanism 20 has the operation unit 24B disposed on the front side of the raised lower boom 4A when the working device 4 is in a turning posture.

  The tilt mechanism 20 tilts the rear side of the floor member 9 around the pin 18C of the floor support mechanism 18 as shown in FIGS. 11 and 14, the guide rail 21, the connecting pin 22, the screw shaft 24, the moving member 25, etc., which will be described later, are roughly configured.

  As a result, the tilt mechanism 20 uses a connecting pin 22 (described later) provided on the rear end side of the guide rail 21 as a swing fulcrum, and moves the moving member 25 attached to the floor member 9 side in the middle of the guide rail 21. As the moving fulcrum, when the moving member 25 is displaced to an arbitrary position along the guide rail 21, the floor member 9 is tilted up and down (tilted) in accordance with the displacement amount of the moving member 25. .

  21 is a guide rail whose rear end side is mounted on the guide rail mounting brackets 7F and 7G of the support member 7 so as to be swingable upward and downward. The guide rail 21 has a free end and a rear end side. A moving member 25 (described later) is linearly guided to the side. As shown in FIG. 14, the guide rail 21 is provided with a rear end mounting portion 21A which is swingably mounted on the guide rail mounting brackets 7F and 7G described above so as to swing upward and downward, and upward and downward. And a pair of rail portions 21B extending in parallel from the rear end mounting portion 21A in a state of being spaced apart from each other, and a front end connecting plate 21C provided by connecting the front end portions of the rail portions 21B. As a rectangular frame. Further, a shaft insertion hole 21D through which the distal end side of the screw shaft 24 penetrates is formed in the distal end connecting plate 21C between the rail portions 21B. On the other hand, the rear end portion of the rear end attachment portion 21A is provided with a pin insertion hole 21E through which a later-described connecting pin 22 is inserted.

  Reference numeral 22 denotes a connecting pin for mounting the guide rail 21 to the guide rail mounting brackets 7F and 7G of the support member 7 so as to be swingable. The connecting pin 22 constitutes a swing fulcrum of the guide rail 21. Further, the connecting pin 22 is provided with an oblong flange portion 22A at a position facing the right bracket 7G, and a bolt insertion hole 22B for preventing rotation is formed in the flange portion 22A.

  When the guide rail 21 is attached to the support member 7 using the connecting pin 22, the rear end mounting portion 21A of the guide rail 21 is disposed between the brackets 7F and 7G, and in this state, the pin holes 7F1, 7G1, By inserting the connecting pin 22 so as to penetrate through the pin insertion hole 21E, the guide rail 21 can be attached to the front side of the support member 7 so as to be swingable upward and downward. Further, the bolt insertion hole 22B provided in the flange portion 22A of the connection pin 22 is aligned with the screw hole 7G2 of the bracket 7G, and the connection pin 22 is prevented from rotating by screwing the bolt 23 into the screw hole 7G2. , It can be kept in a retaining state. On the other hand, when removing the guide rail 21 from the support member 7, the guide rail 21 can be removed by loosening the bolt 23 and pulling the connecting pin 22 to the right.

  Here, when the guide rail 21 is attached to or removed from the support member 7, as shown in FIG. 10, the hand is easily extended to the connecting pin 22 and the bolt 23 by removing a protective cover 26 described later. And a sufficient working space can be secured around it. Therefore, in the hydraulic excavator 1 according to the present embodiment, it is not necessary to tilt up the floor member 9 and the like when attaching and removing the tilt mechanism 20.

  Reference numeral 24 denotes a screw shaft provided between the rail portions 21B of the guide rail 21 and extending along the rail portions 21B. The screw shaft 24 is formed as a rod-like body having a thread on the outer periphery, and is screwed into a screw hole 25C of a moving member 25 described later. The screw shaft 24 is rotatably attached in a state where the rear end side is a free end 24A and the front end side is positioned in the axial direction on the front end connecting plate 21C of the guide rail 21.

  Further, the distal end portion of the screw shaft 24 projects from the distal end connecting plate 21C to the front side to form an operation portion 24B. For example, the operation portion 24B has a hexagonal shape similar to a bolt head, so that a screw tightening tool (not shown) such as an impact wrench can be connected from the outside. Further, the screw shaft 24 can arbitrarily adjust the angle when the floor member 9 is tilted up according to the amount of rotation thereof, so that the work space corresponding to the inspection work, the maintenance work, the attachment / detachment work of the equipment, etc. is appropriately set. Can get to.

  Here, the operating portion 24B of the screw shaft 24 is positioned higher than the connecting pin 22 because the guide rail 21 is inclined upward toward the front side so that the front end connecting plate 21C side is higher than the rear end attaching portion 21A side. Thus, as shown in FIGS. 1 and 2, the lower boom 4A, the arm 4D and the like of the work device 4 are arranged at a height position where they can be operated in the transport posture. Thereby, the operator can operate the operation part 24B of the screw shaft 24 by getting on the upper side of the lower boom 4A of the work device 4, for example. Further, the operation portion 24B of the screw shaft 24 is arranged at an operable position on the front side of the lower boom 4A even when the working device 4 takes a turning posture as shown in FIG.

  Reference numeral 25 denotes a moving member constituting a moving fulcrum of the tilt mechanism 20, and the moving member 25 is attached to the screw shaft 24 and is attached to the connection bracket 13 of the floor member 9. The moving member 25 is positioned in the middle of the guide rail 21 and linearly moves (displaces) along the guide rail 21 to the front end side or the rear end side when the screw shaft 24 is rotationally driven. .

  Further, as shown in FIG. 14, the moving member 25 is provided with a columnar shaft body 25A extending in the left and right directions and an enlarged diameter at one end of the shaft body 25A opposite to the floor member 9. The flange 25B, a screw hole 25C that is located on one side of the shaft body 25A, penetrates in the diameter direction of the shaft body 25A, and is threaded on the inner peripheral side, and the shaft body 25A A retaining washer 25D disposed facing the other end surface, and a bolt 25E screwed to the other end portion of the shaft body 25A to fix the washer 25D to the other end surface of the shaft body 25A; It is roughly constituted by.

  And the one end side of the length direction of the moving member 25 is arrange | positioned so that the movement between each rail part 21B of the guide rail 21 is possible. In this state, the screw shaft 24 is screwed into the screw hole 25C. Further, the other end side of the shaft body 25A is rotatably inserted into a sleeve 13A of the connection bracket 13 provided on the floor member 9. In this state, by fixing the washer 25D to the other end portion of the shaft body 25A with the bolt 25E, the shaft body 25A can be held in a state of being prevented from being detached from the sleeve 13A.

  Reference numeral 26 denotes a protective cover which is located on the right side of the base 7A of the support member 7 and is attached to the floor member 9 (see FIGS. 4 and 10). The protective cover 26 can be attached to and removed from the right side of the floor member 9 so as to cover the vicinity of the connecting pin 22 for connecting the guide rail 21 to the revolving frame 5 and the guide rail mounting brackets 7F and 7G of the support member 7. Is provided. The protective cover 26 includes a box-like body 26A that covers the right side portion of the base 7A from above, and a tongue piece 26B that extends from the front end of the box-like body 26A to the front side and covers the vicinity of the connecting pin 22 and the bolt 23. It is configured.

  Normally, by attaching the protective cover 26 and covering the connecting pin 22 and the bolt 23 with the tongue piece 26B, it is possible to prevent a situation in which the connecting pin 22 is removed by mischief. When the protective cover 26 is removed, the connecting pin 22 and the bolt 23 can be exposed to the right outside of the floor member 9 that can be easily reached, and the connecting pin 22 can be removed.

  Next, the attachment state of the tilt mechanism 20 to the support member 7 and the floor member 9 of the turning frame 5 will be described. First, the rear end attachment portion 21 </ b> A of the guide rail 21 is attached to the support member 7 of the revolving frame 5 by the connecting pin 22 so as to be swingable. On the other hand, the moving member 25 that moves along the guide rail 21 is inserted into the connection bracket 13 of the floor member 9.

  Here, as shown in FIG. 9, in the tilt mechanism 20, the center of the connecting pin 22 located on the rear end side of the guide rail 21 is the swing fulcrum O1, and the center of the moving member 25 is the moving fulcrum O2. In this case, since the rear side of the floor member 9 is tilted down and placed on the support member 7, the moving fulcrum O2 is arranged at a position higher than the swing fulcrum O1 by the height dimension H. The rail 21 is inclined upward toward the front side so that the tip connecting plate 21C side is higher than the rear end attachment portion 21A side. Further, the operation portion 24B of the screw shaft 24 is higher than the connecting pin 22 as a swing fulcrum, and is higher than the upper position of the lower boom 4A, that is, the height position at which it can be operated without being obstructed by the lower boom 4A in the transport posture. Placed in position.

  Accordingly, the direction when the moving member 25 is moved to the front end side along the guide rail 21 is the upper side or the front side, and therefore, the direction when the rear side of the floor member 9 is tilted up may be made substantially the same. it can. Therefore, the force when the screw shaft 24 is rotated can be efficiently applied as the force for moving the moving member 25, and the floor member 9, the driver's seat 14, the canopy 17 and the like can be tilted up with a light force. .

  Further, the lower boom 4A and the floor member 9 of the offset type working device 4 are arranged close to each other, and the tilt mechanism 20 is arranged using a slight gap. However, the tilt mechanism 20 is tilted upward so that the tip end side of the guide rail 21 becomes higher, so that the operation portion 24B of the screw shaft 24 is moved to the transport device 4 in the transport posture as shown in FIGS. It arrange | positions in the position higher than the lower boom 4A. Further, the operation portion 24B of the screw shaft 24 is disposed on the front side of the lower boom 4A of the working device 4 in the turning posture as shown in FIG. Accordingly, the tool can be connected to the operation portion 24B of the screw shaft 24 without being obstructed by the lower boom 4A, the outer cover 19 and the like of the work device 4, and the connected tool can be easily operated.

  The tilt mechanism 20 configured as described above is configured by connecting tools such as an impact wrench and a spanner to the operation portion 24B of the screw shaft 24 protruding on the lower boom 4A in a state where the offset working device 4 is in the transport posture. By rotating the screw shaft 24, the moving member 25 screwed to the screw shaft 24 is moved to the distal end side of the guide rail 21. Accordingly, the tilt mechanism 20 can increase the distance between the support member 7 on the revolving frame 5 side and the moving member 25. Therefore, as shown in FIG. 15, the floor member 9 to which the moving member 25 is connected is provided. It is possible to tilt up to the front side or the upper side around the floor support mechanism 18.

  On the other hand, the tilt mechanism 20 reduces the distance between the support member 7 and the moving member 25 by rotating the screw shaft 24 in the reverse direction and moving the moving member 25 to the rear end side of the guide rail 21. The floor member 9 can be tilted down from the rear side to the lower side.

  As shown in FIG. 5, 27 indicates a hydraulic oil tank disposed on the right side of the right front vertical plate 5 </ b> C of the revolving frame 5, and 28 indicates a fuel tank disposed on the front side of the hydraulic oil tank 27. Yes.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation when the upper swing body 3 is assembled will be described.

  First, the engine 6 is mounted on the rear side of the revolving frame 5, the support member 7 is attached to the revolving frame 5 so as to straddle the engine 6, and the hydraulic oil tank 27, the fuel tank 28, the exterior cover 19 and the like are attached. Further, the front portion of the floor member 9 is attached to the front side of the revolving frame 5 via the floor support mechanism 18, and the tilt mechanism 20 is attached to the support member 7 and the floor member 9.

  In this case, the assembly work can be performed with the rear portion of the floor member 9 placed on the support member 7 without tilting up the floor member 9 or the like. That is, the guide rail mounting brackets 7F and 7G of the support member 7, the rear end mounting portion 21A of the guide rail 21 and the connecting pin 22 constituting the tilt mechanism 20 are easily accessible from the outside on the right outside of the floor member 9. Arranged to reach. Further, the connection bracket 13 and the moving member 25 of the floor member 9 are also arranged on the right side of the floor member 9 at a position that can be easily reached from the outside. Thereby, the assembling work of the tilt mechanism 20 can be performed in a state where the floor member 9 is tilted down.

  Next, the operation of the hydraulic excavator 1 assembled in this way will be described. First, the operator can sit on the driver's seat 14 and operate the traveling lever / pedal 15 in this state to allow the lower traveling body 2 to travel. Further, by operating the working lever 16, the working device 4 can be lifted and lowered to perform soil excavation work or the like.

  On the other hand, an operation for tilting up the floor member 9 in order to perform a maintenance operation of the excavator 1 will be described. In this case, it is possible to take a stable transportation posture by folding the lower boom 4A and the like so that the working device 4 is folded forward so that the bucket 4E and the arm 4D are held in front. Then, when the working device 4 is in the transport posture, the bolts and the like that attach the rear portion of the floor member 9 to the support member 7 of the revolving frame 5 are removed. Next, the operator rides on the lower boom 4A of the work device 4, and connects an impact wrench or the like to the operation portion 24B at the tip of the screw shaft 24 constituting the tilt mechanism 20 from above the lower boom 4A. Rotation drive.

  As a result, the moving member 25 can be moved to the front end side along the guide rail 21 by an external operation. Therefore, the floor member 9, the canopy 17 and the like to which the moving member 25 is attached are shown in FIG. Further, it is possible to tilt up from the floor support mechanism 18 toward the upper side or the front side.

  At this time, the direction when the moving member 25 is moved to the front end side along the guide rail 21 and the direction when the rear side of the floor member 9 is tilted up are substantially the same upper side or front side. Thus, the floor member 9 and the like can be tilted up.

  In the state where the floor member 9 is tilted up, maintenance work and the like of the engine 6 and the control valve can be performed. On the other hand, when the work is finished, the screw shaft 24 is rotationally driven in the reverse direction by the impact wrench, and the moving member 25 is moved to the rear end side along the guide rail 21, thereby moving the floor member 9 and the like downward or rearward. Can be tilted down.

  Thus, according to the present embodiment, the guide rail 21 that guides the moving member 25 with the tilt mechanism 20 is on the upper side so that the front end side is higher than the rear end side in a state where the floor member 9 is tilted down. It is tilted. As a result, the operating portion 24B of the screw shaft 24 can be operated with the lower boom 4A, the arm 4D, etc. of the work device 4 in the transport posture at a position higher than the connecting pin 22, as shown in FIGS. It can be placed in the position.

  As a result, the operator can use a tool such as an impact wrench from the upper side of the lower boom 4A to the operation portion 24B of the screw shaft 24 without being obstructed by the lower boom 4A of the work device 4 disposed in the vicinity of the right side of the floor member 9. Can be connected, the connected tool can be easily operated, and the workability of the tilting work can be improved. In addition, as shown in FIG. 3, the operating portion 24B of the screw shaft 24 is disposed on the front side of the lower boom 4A of the working device 4 in the turning posture, so that the tilting operation can be performed even in this turning posture. .

  Further, as shown in FIG. 9, the rear end attaching portion 21A of the guide rail 21 is attached to the floor member 9 side rather than the swing fulcrum O1 of the connecting pin 22 that swingably attaches to the support member 7 on the revolving frame 5 side. Since the moving fulcrum O2 of the moving member 25 that moves along the guide rail 21 in a state of being in a state of being placed is located at a position that is higher than the height dimension H, the guide rail 21 is located at the leading end connecting plate 21C from the rear end mounting portion 21A side. It can be inclined upward toward the front side so that the side becomes higher. Thereby, the direction when moving the moving member 25 to the front end side along the guide rail 21 can be set to substantially the same upper side or front side as the direction when the rear side of the floor member 9 is tilted up.

  Accordingly, the force when the screw shaft 24 is rotated can be efficiently applied as the force for moving the moving member 25, and the floor member 9 can be tilted up with a light force. The strength of the shaft 24, the moving member 25, etc. can be set low. Further, the screw shaft 24 of the tilt mechanism 20 can be easily rotated manually, and workability can be improved.

  Further, the guide rail mounting brackets 7F and 7G of the support member 7 to which the guide rail 21 is attached and the connection bracket 13 of the floor member 9 to which the moving member 25 is attached are easily accessible from the rear side or the right side of the canopy 17. Is arranged. As a result, the assembling work of the tilt mechanism 20 can be performed in a stable state in which the floor member 9 is tilted down without the floor member 9 etc. being tilted up. Workability can be improved.

  On the other hand, on the rear end side of the tilt mechanism 20, a protective cover 26 is provided on the right outer side of the floor member 9, and the guide rail mounting brackets 7 F and 7 G of the support member 7 and the connecting pin 22 are provided by the protective cover 26. Can be covered. Therefore, the protective cover 26 can prevent a situation in which the tilt mechanism 20 is tampered with, and can protect the tilt mechanism 20 and improve reliability.

  Further, since the tilt mechanism 20 uses the screw shaft 24 as means for moving the moving member 25, the angle when the floor member 9 is tilted up can be arbitrarily adjusted by the amount of rotation of the screw shaft 24. it can. As a result, the work space formed below the floor member 9 can be appropriately adjusted according to inspection work, maintenance work, attachment / detachment work, etc., so that unnecessary tilt work is omitted and workability is improved. be able to.

  In the embodiment, the canopy-spec hydraulic excavator 1 in which the canopy 17 that covers the right side and the upper side of the driver's seat 14 is provided on the floor member 9 is illustrated. However, the present invention is not limited to this, and a cab 32 that covers the periphery and upper side of the driver's seat 14 is provided on the floor member 9 as a building, such as a hydraulic excavator 31 according to the first modification shown in FIG. It is good also as a structure.

  Further, in the embodiment, the offset hydraulic excavator 1 including the offset working device 4 as a construction machine has been described as an example. However, the present invention is not limited to this, and can also be applied to a mono-boom hydraulic excavator provided with a mono-boom working device 42, such as a hydraulic excavator 41 according to the second modification shown in FIG. .

  That is, the work device 42 provided in the mono-boom hydraulic excavator 41 is a standard work device that does not perform an offset operation, and is generally configured by a boom 42A, an arm 42B, a bucket 42C, and cylinders 42D, 42E, and 42F. Has been. The mono-boom working device 42 can be similarly applied to a canopy-type hydraulic excavator 31.

  In the embodiment, a hydraulic excavator 1 including a crawler type lower traveling body 2 is described as an example of a construction machine. However, the present invention is not limited to this, and can be applied to other construction machines such as a hydraulic excavator and a hydraulic crane including a wheel-type lower traveling body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a canopy-spec offset hydraulic excavator according to an embodiment of the present invention in a state where a working device is in a transport posture. It is a front view which shows the offset type hydraulic excavator of FIG. FIG. 2 is a front view showing the offset hydraulic excavator of FIG. 1 in a state where the working device is lifted to a small turning posture. It is a top view which expands and shows the offset hydraulic excavator of FIG. It is a top view which shows the upper turning body of the state which removed the counterweight, the canopy, the driver's seat, the exterior cover, etc. It is a top view which shows a turning frame. It is a front view which shows the upper turning body in the state which removed the counterweight, the tank, the exterior cover, etc. with a part of working apparatus in a transport position. It is an enlarged front view which expands and shows the upper turning body shown in FIG. It is a principal part enlarged front view which expands and shows the tilt mechanism and periphery in FIG. It is a perspective view of the principal part expansion which shows the state which removed the protective cover and exposed the connecting pin of the tilt mechanism. It is an external appearance perspective view which shows a supporting member and a tilt mechanism. It is a top view which shows a floor member alone. It is a perspective view which shows a floor member alone. It is a disassembled perspective view which shows a tilt mechanism with a supporting member and a part of floor member. It is a front view which shows the state which raised the floor member and the canopy by the tilt mechanism. It is a front view which shows the cab specification offset type hydraulic excavator by the 1st modification of this invention. It is a front view which shows the monoboom type hydraulic excavator of canopy specification by the 2nd modification of this invention.

Explanation of symbols

1,31,41 Excavator (Construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Upper revolving body 4,42 Work apparatus 4A Lower boom 4A1 Foot part 4B Upper boom 4C arm support member 4D Arm 4E Bucket 5 Turning frame 5A Bottom plate 5B Left front vertical plate 5C Right front vertical plate 6 Engine 7 Support member 7A Pedestal 7B 7E Prop 7F, 7G Guide rail mounting bracket 9 Floor member 10 Footrest plate 13 Connection bracket 14 Driver's seat 17 Canopy 18 Floor support mechanism (support point)
20 Tilt mechanism 21 Guide rail 22 Connecting pin 24 Screw shaft 24B Operation part 25 Moving member 26 Protective cover O1 Oscillating fulcrum O2 Moving fulcrum

Claims (5)

A frame having a bottom plate and left and right vertical plates erected on the bottom plate, a boom and an arm rotatably supported by the boom, and the foot portion of the boom is the left and right vertical plates In a construction machine comprising: a work device that is positioned on the front side of the work device and is supported so as to be able to move up and down; and a floor member that is located on the left side of the boom of the work device and provided on the frame.
The floor member is configured to be tiltably supported on the frame with a front side as a support point, and extends between the boom and the floor member of the working device in a front and rear direction so that the floor member is supported by the support point. A tilt mechanism that tilts up and down at the center is arranged.
The tilt mechanism is located on the rear end side in the length direction and is attached to the frame so as to be able to swing, a moving fulcrum provided at an intermediate portion in the length direction and attached to the floor member, An operation unit provided on the distal end side in the length direction and operating the tilting operation of the floor member by moving the movement fulcrum;
The construction machine according to claim 1, wherein the operation unit of the tilt mechanism is disposed at a height position where the boom and the arm can be operated in a folded state in a transport posture. The tilt mechanism is attached to the frame so that the rear end side can swing upward and downward as the swing fulcrum, the front end side is a free end, and extends along the guide rail. A screw shaft that is rotatably attached with the tip portion serving as the operation portion and positioned in the length direction of the guide rail, and a screw shaft that is rotatably attached to the floor member side and screwed to the screw shaft. A moving member that serves as a moving fulcrum that moves forward and backward along the guide rail,
The construction machine according to claim 1, wherein the moving member is disposed at a position higher than a rear end side of the guide rail, and thereby the guide rail is inclined upward toward the front end side. An engine is provided on the rear side of the frame, and a support member that supports the rear side of the floor member is provided across the engine.
The support member, the construction machine according bracket for supporting the rear end of the tilt mechanism swingably to claim 1 or 2 comprising a structure provided in a position higher than the engine. The construction machine according to claim 3 , wherein the bracket of the support member is disposed at a position on the right outside of the floor member. The rear end side of the tilt mechanism is connected to a bracket of the support member using a connection pin so as to be swingable, and a cover that covers the bracket and the vicinity of the connection pin can be attached to and detached from the rear end side of the tilt mechanism. The construction machine according to claim 3 , wherein the construction machine is configured to be provided in the construction.

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