JP2014047564A - Construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the posture of an operator when performing oil-feeding work in the middle of a step.SOLUTION: An article storage case 12 is provided with a stair-like upper stage step 16 having a plurality of stages and a handrail 17. The handrail 17 is constituted of a lower handrail part 18, an upper handrail part 20, a handrail connection member 23, and an auxiliary handrail part 30. The auxiliary handrail part 30 extends vertically at a position set aside to vertical plates 5B, 5C side from an arrangement position of the lower handrail part 18, an upper end side of the auxiliary handrail part 30 is fixed to the handrail connection member 23, and a lower end side thereof is fixed to a middle stage step plate 16B among the upper stage step 16. Thus, when an operator 51 squats down on the upper stage step 16 for oil-feeding work or the like, the auxiliary handrail part 30 is disposed at a position where it is easily grasped. Therefore, a working posture of the operator can be stabilized and the oil-feeding work can be smoothly and safely performed.

Description

  The present invention relates to a construction machine such as a hydraulic excavator and a wheel loader, and more particularly to a construction machine provided with a handrail gripped by an operator who moves up and down steps provided on an upper swing body.

  In general, a hydraulic excavator, which is a representative example of a construction machine, is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and can be raised and raised on the front side of the upper revolving body. And a working device provided.

  Further, the upper swing body includes a swing frame that forms a support structure member, an engine mounted on the rear side of the swing frame, and a cab provided on the left front side of the swing frame so as to follow the left side of the working device. And a driver's seat on which an operator is seated is provided in the cab.

  The revolving frame is provided with an oil storage tank such as a fuel tank for storing fuel to be supplied to the engine and a hydraulic oil tank for storing hydraulic oil to be supplied to and discharged from the working device, which is located on the right side of the working device. An article storage case for storing a tool box, a control valve, and the like is provided on the front side of the.

  By the way, there is known a hydraulic excavator provided with a stepped step on the front side of the article storage case, and an operator moves the step up and down to supply a fuel tank or a hydraulic oil tank provided on the upper surface. Fuel and hydraulic oil can be replenished from the mouth (see, for example, Patent Document 1 and Patent Document 2).

JP 2005-98013 A JP 2007-46405 A

  By the way, in the steps according to Patent Document 1 and Patent Document 2 described above, a handrail for assisting worker's safety and raising / lowering is provided along the step between the front end of the swivel frame and the oil storage tank. ing.

  However, these handrails are not necessarily arranged at positions where the operator can easily grasp them in accordance with the steps of the respective steps. In addition, since the oil storage tank refueling port is provided at the position where the step has been completed, the operator, when refueling the fuel tank or the hydraulic oil tank, does not complete the step, You may be crouching on the way and refueling.

  Here, the handrail for raising and lowering according to Patent Document 1 and Patent Document 2 described above has a height dimension that is easy to grip when raising and lowering each step in a posture in which the worker stands up. Therefore, when refueling work in a crouched posture in the middle of a step, it is difficult for the operator to grasp because the height of the handrail is too high, and even if it is grasped, a sufficiently stable posture There is a problem that it is difficult to ensure.

  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 make it easy to move up and down the step and to improve safety when squatting in the middle of a step to perform a refueling operation. It is to provide a construction machine that can.

  A construction machine according to the present invention includes 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. The upper revolving body has a flat bottom plate and left and right vertical plates extending forward and rearward on the bottom plate, and is provided with a bracket for attaching the working device to the front end of each vertical plate A frame, an engine mounted in a laterally extending state in the left and right directions on the rear side of the revolving frame, and a left plate and a right side of the revolving frame sandwiching a vertical plate of the revolving frame. A cab provided on the front side, an oil storage tank located on the front side of the engine and disposed on the other side in the left and right directions with the vertical plate of the revolving frame interposed therebetween, a front side of the oil storage tank and the revolving frame of the revolving frame Provided on the opposite side of the cab across the vertical plate And a goods container case.

  In order to solve the above-described problem, the feature of the configuration adopted by the invention of claim 1 is provided between the front end of the swivel frame and the oil storage tank so as to be positioned on the front side of the article storage case. A lowermost step, a plurality of upper steps provided between the lowermost step and the oil storage tank and provided stepwise on the front surface of the article storage case, and left and right of the article storage case A handrail is provided between a front end of the swivel frame and the oil storage tank along an outer side of the direction, and is gripped by an operator who moves up and down each step, and the handrail has a lower end on the swivel frame. A lower handrail part that is fixed to the front end of the article storage case, the middle part extends along the left and right outer sides of the article storage case and extends above the article storage case, and the upper end extends in the vicinity of the uppermost step. , A handrail connecting member with the upper end side of the lower handrail portion fixed, a front end side fixed to the handrail connecting member, and a midway portion extending rearward at an upper position of the oil storage tank and bent toward the cab. An upper handrail portion whose side is fixed to the upper surface side of the oil storage tank, and an upper end side that extends upward and downward at a position closer to the vertical plate side than an arrangement position of the lower handrail portion is the handrail The lower end side is fixed to the connecting member, and the auxiliary handrail portion is fixed to one of the upper steps.

  According to a second aspect of the present invention, the upper handrail portion includes a front support whose lower end is fixed to the article storage case and extends upward, and whose upper end is fixed to the handrail connecting member, and whose front end is the handrail connecting member. A horizontal strut that is fixed and extends rearward at an upper position of the oil storage tank from the upper end side of the front strut and bends toward the cab, and a lower end side that extends downward from the rear end side of the horizontal strut toward the oil storage tank. It is constituted by a rear support fixed to the upper surface of the oil storage tank.

  According to a third aspect of the present invention, the auxiliary handrail portion is located on a side of the worker when the worker squats on the upper step and supplies fuel from a supply port provided on an upper surface of the oil storage tank. It is in the configuration.

  According to a fourth aspect of the present invention, the upper step is composed of three steps of a lower step plate, a middle step plate, and an upper step plate, and a lower end side of the auxiliary handrail portion is the middle step of the upper step. It is in the structure which attaches to a board.

  According to the first aspect of the present invention, in the middle portion of the lower handrail portion disposed between the front end of the swivel frame and the oil storage tank, the inner side (vertical plate) on the left and right sides of the lower handrail portion. Auxiliary handrails extending upward and downward on the side) are provided separately. As a result, when the worker moves up and down between the ground and the oil storage tank using each step as a foothold, the worker can securely grip the lower handrail portion, the upper handrail portion, and the auxiliary handrail portion. Each step can be moved up and down safely.

  Further, for example, when the worker squats down during the upper step and performs the refueling operation, the work posture can be stabilized by grasping the auxiliary handrail portion, so that the safety of the refueling operation can be improved.

  Further, the upper handrail portion extends rearward at an upper position of the oil storage tank, and a midway portion is bent toward the cab. As a result, when the worker has gone up the upper step, the periphery of the worker can be surrounded by the upper handrail portion, and safety during lifting can be improved.

  Furthermore, the handrail is divided and formed by a lower handrail portion, an upper handrail portion, and an auxiliary handrail portion.The lower handrail portion, the upper handrail portion, and the auxiliary handrail portion are: It is connected by a handrail connecting member. Thereby, since each handrail part can be conveyed easily and a handrail can be easily attached to a construction machine, the workability | operativity at the time of attaching a handrail can be improved. In addition, the strength of the entire handrail can be increased by disposing the auxiliary handrail portion at an intermediate portion of the lower handrail portion.

  According to the invention of claim 2, the upper handrail portion is formed in a substantially inverted U shape as a whole by the front strut, the horizontal strut, and the rear strut, and the handrail connecting member is horizontal with the upper end side of the front strut. It is fixed to the front end side of the column. Thereby, since the upper end side of a lower handrail part can be supported by the front support | pillar of an upper handrail part, the intensity | strength of the whole handrail can be raised.

  According to the third aspect of the present invention, when the worker performs the refueling operation with respect to the oil storage tank in a posture in which the worker crouches on the upper step, the worker easily holds the auxiliary handrail portion in the squatting posture. Thus, a stable posture can be maintained, and the refueling operation can be performed smoothly and safely.

  According to the invention of claim 4, when the operator squats with the right foot on the middle step plate and the left foot on the lower step plate, the auxiliary handrail portion that extends upward and downward just in the vicinity of the operator's left arm. Is disposed. Thereby, the worker can hold the auxiliary handrail portion with the left hand, and can support his / her body and maintain a stable working posture.

It is a front view which shows the hydraulic excavator applied to embodiment of this invention. It is an enlarged plan view showing a hydraulic excavator. It is a right view which shows a hydraulic excavator in the state which removed the working device. It is a top view which shows the turning frame carrying an engine. It is a perspective view which shows a hydraulic excavator in the state which removed the working device. FIG. 6 is an enlarged perspective view of a part (VI) in FIG. 5 showing an article storage case, a handrail, a hydraulic oil tank, a fuel tank, and the like. It is a front view which shows the handrail attached to a hydraulic shovel alone. It is the right view which looked at the handrail from the arrow VIII-VIII direction in FIG. It is a perspective view which shows a handrail alone. FIG. 10 is an enlarged perspective view of a handrail connecting member, an upper handrail portion, an auxiliary handrail portion, a lower handrail portion, a protruding portion, and the like as seen from the direction of arrows XX in FIG. 9. It is a disassembled perspective view which shows the state which removed the auxiliary handrail part, the lower handrail part, the protrusion part, etc. from the handrail connection member. It is an enlarged front view which shows the state in which an operator supplies fuel to a fuel tank. It is the same perspective view as FIG. 9 which shows the modification of the handrail used for the construction machine of this invention. It is a disassembled perspective view similar to FIG. 11 which shows the state which removed the auxiliary handrail part, the upper handrail part, the protrusion part, etc. from the handrail connection member.

  Hereinafter, as a construction machine according to an embodiment of the present invention, a crawler type hydraulic excavator will be described as an example and described in detail with reference to FIGS.

  In FIG. 1, reference numeral 1 denotes a hydraulic excavator as a construction machine used for earth and sand excavation work and the like. This hydraulic excavator 1 is a self-propelled crawler-type lower traveling body 2, is rotatably mounted on the lower traveling body 2, and an upper revolving body 3 that forms a traveling body together with the lower traveling body 2, The working device 4 is configured roughly on the front side of the upper swing body 3 so as to be movable up and down.

  The upper swing body 3 is generally constituted by a swing frame 5, a counterweight 6, an engine 7, a cab 9, a hydraulic oil tank 10, a fuel tank 11, an article storage case 12, and the like, which will be described later.

  Reference numeral 5 denotes a turning frame as a support structure. As shown in FIG. 4 and the like, the swivel frame 5 is provided with a thick flat plate-like bottom plate 5A extending in the front and rear directions, and standing on the bottom plate 5A, with a predetermined interval in the left and right directions. A left vertical plate 5B and a right vertical plate 5C extending in the rearward direction, and a plurality of extended beams 5D arranged from the vertical plates 5B and 5C outward in the left and right directions and spaced apart in the rearward direction. The left side frame 5E and the right side frame 5F are located outside the left and right directions, attached to the tip of each overhanging beam 5D, and extended in the front and rear directions. A bracket 5G for attaching the work device 4 is provided at the front end of each vertical plate 5B, 5C, and the work device 4 is pin-coupled to the bracket 5G, so that the work device 4 is attached to the revolving frame 5.俯 It is mounted so that it can move up and down.

  Reference numeral 6 denotes a counterweight attached to the rear end portion of the revolving frame 5, and the counterweight 6 balances the weight with the work device 4. Here, the hydraulic excavator 1 is formed as a small rear turning type hydraulic excavator in which the turning radius from the turning center of the upper turning body 3 to the rear surface of the counterweight 6 is reduced. Therefore, the rear surface of the counterweight 6 is formed in an arc shape centered on the turning center of the upper swing body 3 as viewed from above, and the counterweight 6 is disposed at a position close to the swing center of the upper swing body 3. .

  Reference numeral 7 denotes an engine provided on the rear side of the swing frame 5 and located on the front side of the counterweight 6. The engine 7 is configured as a diesel engine, and is placed on the revolving frame 5 in a horizontally placed state extending leftward and rightward as shown in FIG. A hydraulic pump 8 is attached to the right side of the engine 7. The hydraulic pump 8 is driven by the engine 7 so that hydraulic oil from a hydraulic oil tank 10 to be described later is supplied to the hydraulic actuator as pressure oil. Are discharged.

  Reference numeral 9 denotes a cab provided on the left side (one side) in the left and right directions across the vertical plates 5B and 5C of the revolving frame 5 and provided on the front side of the revolving frame 5. The cab 9 is to be boarded by an operator, and a driver's seat on which the operator is seated, various operation levers, an air conditioner and the like (all not shown) are arranged.

  Reference numeral 10 denotes a hydraulic oil tank as an oil storage tank disposed on the right side (the other side) in the left and right directions with the vertical plates 5B and 5C of the revolving frame 5 sandwiched between the front side of the engine 7. The hydraulic oil tank 10 is formed as a rectangular parallelepiped pressure-resistant tank extending in the upward and downward directions. A supply port 10 </ b> B for supplying hydraulic oil is provided on the upper surface 10 </ b> A of the hydraulic oil tank 10.

  Reference numeral 11 denotes a fuel tank as an oil storage tank adjacent to the hydraulic oil tank 10 and disposed on the right side in the left and right directions with the vertical plates 5B and 5C of the revolving frame 5 interposed therebetween. The fuel tank 11 is formed as a rectangular parallelepiped pressure-resistant tank extending in the upward and downward directions, and can store fuel sufficient for working for a specified operating time. Further, a supply port 11 </ b> B for supplying fuel is provided on the upper surface 11 </ b> A of the fuel tank 11.

  An article storage case 12 is provided on the right front side of the revolving frame 5 and is located on the front side of the hydraulic oil tank 10 and the fuel tank 11. A control valve or the like (not shown) is accommodated in the article storage case 12. The article storage case 12 is roughly constituted by a left side plate 13, a right side cover 14, and an upper step 16 which will be described later.

  Reference numeral 13 denotes a left side plate constituting the left side of the article storage case 12. The left side plate 13 is erected from the bottom plate 5A of the revolving frame 5 and faces the right vertical plate 5C with a slight gap while forming the same plane as the left side of the hydraulic oil tank 10 in the state where the hydraulic oil tank 10 is formed. 10 extends from the front surface toward the front end of the revolving frame 5.

  Reference numeral 14 denotes a right side cover that constitutes the right side of the article storage case 12. The right side cover 14 is disposed outside the upper swing body 3 and faces the left side plate 13 with an interval in the left and right directions. Yes. Here, the right side cover 14 is provided on the front side of the revolving frame 5 and can be opened and closed. A front opening / closing cover 14A and an openable rear opening / closing cover 14B positioned between the front opening / closing cover 14A and the right side surface of the fuel tank 11. And an inclined plate 14C extending obliquely upward from the upper end side of the rear opening / closing cover 14B toward the right end of an upper step plate 16C described later.

  Reference numeral 15 denotes a lowermost step provided on the front side of the article storage case 12. The lowermost step 15 is formed in a flat box shape and is provided to protrude from the front end of the revolving frame 5.

  Reference numeral 16 denotes a plurality of stepped upper steps constituting the upper surface and the front surface of the article storage case 12. The upper step 16 extends forward and rearward between the front surface of the hydraulic oil tank 10 and the upper end of the front surface of the fuel tank 11 and the front end of the swivel frame 5, and is located above the left side plate 13 and the upper side of the right side cover 14. And is blocking. Here, the upper step 16 is composed of three steps, a lower step plate 16A disposed above the lower step 15, a middle step plate 16B disposed above the lower step plate 16A, and the middle step The upper step plate 16C as the uppermost step disposed between the step plate 16B and the upper surfaces of the hydraulic oil tank 10 and the fuel tank 11 is configured.

  Thus, the operator can easily ascend on the upper swing body 3 by stepping on the step plates 16A, 16B, 16C of the lowermost step 15 and the upper step 16 in order from the lower traveling body 2. it can.

  Next, the handrail 17 to be gripped when the worker moves up and down to the lowermost step 15 and the upper step 16 will be described.

  Reference numeral 17 denotes a handrail fixedly provided between the front end of the swivel frame 5 and the hydraulic oil tank 10 along the outside of the article storage case 12. The handrail 17 is secured when the worker moves up and down on the upper swing body 3 using the lower step 15 and the upper step 16 as a foothold, thereby ensuring safety during the raising and lowering. The handrail 17 is roughly constituted by a lower handrail portion 18, an upper handrail portion 20, a handrail connecting member 23, a protruding portion 26, and an auxiliary handrail portion 30, which will be described later.

  Reference numeral 18 denotes a lower handrail portion constituting the lower portion of the handrail 17. The lower handrail portion 18 has a lower end fixed to the front end of the revolving frame 5, a midway portion extending above the article storage case 12, and an upper end extending to the vicinity of the upper step plate 16 </ b> C of the upper step 16. ing. Here, the lower handrail portion 18 is formed by bending a cylindrical pipe member or the like, and the lower end side is fixed to the right side of the lowermost step 15 at the front end of the swivel frame 5 by a bolt 19, and left and right directions. The lower column 18A extending substantially horizontally toward the outside (right side) of the lower column, the vertical column 18B extending upward from the tip of the lower column 18A, and the diagonally upward direction along the article storage case 12 from the upper end of the vertical column 18B The slanting column 18C extends to the rear, and the upper column 18D extends substantially horizontally from the front end of the slanting column 18C to the rear and is fixed to a handrail connecting member 23 described later.

  Reference numeral 20 denotes an upper handrail portion constituting the upper portion of the handrail 17. The upper handrail portion 20 is formed in a substantially inverted U shape by bending a cylindrical pipe member or the like, and is provided between the article storage case 12 and the hydraulic oil tank 10. Specifically, the upper handrail portion 20 has a lower end fixed on the inclined plate 14C of the right side cover 14 constituting the article storage case 12 and extends upward, and the upper end is bent obliquely upward toward the rear. The front strut 20A, the horizontal strut 20B extending rearward from the upper end side of the front strut 20A at the upper position of the fuel tank 11 and bent in an L shape toward the cab 9, and the rear strut side of the horizontal strut 20B. The rear strut 20 </ b> C extends downward toward the oil tank 10 and has a lower end fixed to the upper surface 10 </ b> A of the hydraulic oil tank 10. In the present embodiment, the horizontal support 20B is bent in an L shape. However, the present invention is not limited to this, and may be a V shape or a curved shape, for example.

  A front fixing plate 20D inclined at the same inclination angle as the inclined plate 14C of the right side cover 14 is fixed to the lower end of the front support 20A. The front fixing plate 20D is attached to the right side cover 14 using bolts 21. It is fixed to the inclined plate 14C.

  A rear fixing plate 20E parallel to the upper surface 10A of the hydraulic oil tank 10 is fixed to the lower end of the rear column 20C. The rear fixing plate 20E is attached to the upper surface 10A of the hydraulic oil tank 10 using bolts 22. It is fixed.

  Reference numeral 23 denotes a handrail connecting member positioned above the article storage case 12, and the handrail connecting member 23 connects the lower handrail portion 18 and the upper handrail portion 20. Here, the handrail connecting member 23 is formed by bending a flat thin plate material, and is fixed to a portion where the front strut 20A and the horizontal strut 20B of the upper handrail portion 20 intersect by welding or the like. Specifically, the handrail connecting member 23 includes a substantially triangular side surface portion 23A located on the outer side (right side) in the left and right directions, and an inner side in the left and right directions (cab 9 side) from the upper end side of the side surface portion 23A. ) Toward the left side and the right side from the front end side of the side surface part 23A, and obliquely forward from the tip side of the extension part 23C. The auxiliary handrail fixing portion 23D having a substantially triangular shape extending in the direction.

  And as shown in FIG. 11, the insertion hole 23E penetrated toward the back surface 23A2 from the surface 23A1 is drilled in two places along the front and back direction at the upper end side of the side surface portion 23A. The upper end side of the lower handrail portion 18 is fixed to the handrail connecting member 23 by a bolt 24 inserted through the insertion hole 23E and the rear end side of the upper column 18D of the lower handrail portion 18.

  In addition, a hollow cylindrical body 25 into which a protruding portion 26 to be described later is inserted is fixed to the back surface 23C1 of the extending portion 23C by welding or the like. On the other hand, an insertion hole 23F is formed on the lower end side of the auxiliary handrail fixing portion 23D.

  Reference numeral 26 denotes a protruding portion protruding upward from the handrail connecting member 23. The protruding portion 26 is formed of a cylindrical pipe material having the same outer diameter as that of the upper handrail portion 20, and the lower end side is a handrail. It is inserted into a cylindrical body 25 provided on the connecting member 23 and fixed by a bolt 27 (see FIG. 10). The protrusion 26 is to be gripped when the worker ascends from the upper step plate 16 </ b> C of the upper step 16 onto the upper swing body 3.

  A mirror 28 is attached to the vertical column 18B of the lower handrail 18 so that an operator seated in the driver's seat in the cab 9 can visually recognize the rear side of the right side surface of the upper swing body 3. Further, a mirror 29 is attached to the horizontal column 20B of the upper handrail portion 20 so that an operator seated in the driver's seat in the cab 9 can visually recognize the front side of the right side surface of the upper swing body 3.

  Reference numeral 30 denotes an auxiliary handrail portion provided between the handrail connecting member 23 and the upper step 16, and the auxiliary handrail portion 30 is located on the right side of the turning frame 5 with respect to the position where the lower handrail portion 18 is disposed. It extends upward and downward at a position shifted to the vertical plate 5C side. Here, the auxiliary handrail portion 30 is formed of a cylindrical pipe material having the same outer diameter as the lower handrail portion 18 and the upper handrail portion 20. The auxiliary handrail portion 30 has an upper end fixed to the auxiliary handrail fixing portion 23D of the handrail connecting member 23, and a lower end above the middle step plate 16B of the upper step 16 obliquely downward toward the right vertical plate 5C side. 30A, and the vertical column 30B that extends downward from the lower end side of the oblique column 30A and the lower end side is fixed to the middle step plate 16B.

  An upper fixing plate 30C made of a rectangular thin plate material is fixed to the upper end side of the oblique column 30A, and a through-hole 30D is formed in a substantially central portion of the upper fixing plate 30C. And the upper end side of the auxiliary handrail 30 is handrailed by the bolt 31 inserted through the through hole 30D of the upper fixing plate 30C and the insertion hole 23F provided in the auxiliary handrail fixing portion 23D of the handrail connecting member 23. The structure is fixed to the connecting member 23.

  On the other hand, a lower fixing plate 30E made of a rectangular thin plate material is fixed to the lower end side of the vertical column 30B, and two through holes 30F are provided in the lower fixing plate 30E. Then, the lower fixing plate 30E is brought into contact with the middle step plate 16B of the upper step 16 and the bolt 32 is inserted into the through hole 30F and fastened, whereby the lower step side of the auxiliary handrail portion 30 is connected to the upper step 16. It is set as the structure which can be fixed to.

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, a refueling operation of the hydraulic excavator 1 will be described with reference to FIG.

  First, the worker 51 has an oil supply hose 52 connected to a tank (not shown) such as an oil vehicle, for example, and goes up on the crawler of the lower traveling body 2 located on the right side of the hydraulic excavator 1, and the handrail 17 While grasping the lower handrail 18, the lower step plate 15 moves upward on the article storage case 12 using the lower step plate 16 </ b> A and the middle step plate 16 </ b> B as the scaffolding. Then, for example, the worker 51 crouches forward with his left foot on the lower step plate 16A and his right foot on the middle step plate 16B, and removes the lid of the supply port 11B provided on the upper surface 11A of the fuel tank 11, The fuel can be supplied to the fuel tank 11 by inserting the nozzle 52 </ b> A of the fuel supply hose 52.

  At this time, the auxiliary handrail portion 30 of the handrail 17 is disposed on the side of the worker 51 (in the vicinity of the left arm) so as to extend upward and downward. As a result, the worker 51 can hold the auxiliary handrail portion 30 with the left hand in a state of squatting forward on the upper step 16, so that his / her body can be supported and a stable working posture can be maintained. it can.

  Thus, according to the present embodiment, the lower handrail portion 18 is disposed at an intermediate portion of the lower handrail portion 18 disposed between the front end of the swivel frame 5 and the hydraulic oil tank 10 and the fuel tank 11. Auxiliary handrail 30 that extends upward and downward at a position shifted to the vertical plates 5B and 5C side from the installation position is provided separately. Thus, when the worker 51 moves up and down between the ground and the hydraulic oil tank 10 and the fuel tank 11 using the lower step 15 and the upper step 16 as a scaffold, the worker 51 moves the lower handrail 18 and the upper The handrail portion 20 and the auxiliary handrail portion 30 can be reliably gripped, and the steps 15 and 16 can be moved up and down safely.

  Further, when the worker 51 crouches in the middle of the upper step 16 and performs the refueling operation to the fuel tank 11 or the like, the auxiliary handrail portion 30 is disposed at a position where the worker 51 is easy to grasp. By gripping the handrail 30, the worker 51 can stabilize the working posture, so that the refueling work can be performed smoothly and safely.

  Further, the upper handrail portion 20 extends rearward at the upper position of the fuel tank 11, and the intermediate portion is bent toward the cab 9. As a result, for example, when the worker 51 has moved up the upper step 16 in maintenance work or the like, the periphery of the worker 51 can be surrounded by the upper handrail portion 20, and safety during raising and lowering can be improved. it can.

  Further, the handrail 17 is divided and formed by a lower handrail portion 18, an upper handrail portion 20, and an auxiliary handrail portion 30, and these lower handrail portion 18, upper handrail portion 20 and auxiliary The handrail portion 30 is connected by a handrail connecting member 23. As a result, the handrail portions 18, 20, and 30 can be easily transported, and the handrail 17 can be easily attached to the excavator 1, thereby improving the workability when the handrail 17 is attached. be able to.

  Moreover, the strength of the handrail 17 as a whole can be increased by disposing the auxiliary handrail portion 30 at an intermediate portion of the lower handrail portion 18. Further, the upper handrail portion 20 is formed in a substantially inverted U shape as a whole by the front strut 20A, the horizontal strut 20B, and the rear strut 20C, and the handrail connecting member 23 is connected to the upper end side of the front strut 20A and the horizontal strut. It is fixed to the front end side of 20B. Thereby, since the upper end side of the lower handrail part 18 can be supported by the front strut 20A of the upper handrail part 20, the strength of the handrail 17 as a whole can be increased.

  In the present embodiment, the upper handrail portion 20 is formed in a substantially inverted U shape by the front strut 20A, the horizontal strut 20B, and the rear strut 20C, and the handrail connecting member 23 is provided on the upper handrail portion 20. The case of fixing by welding or the like has been described as an example. However, the present invention is not limited to this, and the upper handrail portion 42 of the handrail 41 is formed by the horizontal support post 42A and the rear support post 42B, for example, as in the modified example shown in FIG. 13 and FIG. The front end side of 42 </ b> A may be fixed to the handrail connecting member 23 with a bolt 43. In this case, the lower handrail portion 44 is formed in a substantially inverted U shape by the lower support 44A, the front vertical support 44B, the oblique support 44C, the upper support 44D, and the rear vertical support 44E. The handrail connecting member 23 is fixed to the rear end side of the side handrail portion 44 by welding or the like.

  Also in the modified example configured as described above, the weight of the handrail 41 can be increased because the rear vertical column 44E of the lower handrail portion 44 can support the entire weight of the handrail 41.

  Further, in the present embodiment, the case where the lower column 18A of the lower handrail portion 18 is fixed to the front end of the revolving frame 5 and extends horizontally in the left and right directions has been described as an example. However, the present invention is not limited to this. For example, the lower column of the lower handrail portion 18 may be extended forward and backward from the lower end side of the vertical column 18B and directly fixed to the front end side of the revolving frame 5. . The same applies to the front vertical column 44B of the lower handrail portion 44 according to the modification.

  Furthermore, in each embodiment, the crawler type hydraulic excavator 1 has been described as an example of the construction machine. However, the present invention is not limited to this, and can be widely applied to other construction machines such as a wheel-type hydraulic excavator or a hydraulic crane having a lifting step.

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Working device 5 Revolving frame 5A Bottom plate 5B Left vertical plate 5C Right vertical plate 5G Bracket 7 Engine 9 Cab 10 Hydraulic oil tank (oil storage tank)
10A Upper surface 10B Supply port 11 Fuel tank (oil storage tank)
11A Upper surface 11B Supply port 12 Article storage case 15 Bottom step 16 Upper step 16A Lower step plate 16B Middle step plate 16C Upper step plate (upper step step)
17, 41 Handrail 18, 44 Lower handrail portion 20, 42 Upper handrail portion 20A Front strut 20B, 42A Horizontal strut 20C, 42B Rear strut 23 Handrail connecting member 30 Auxiliary handrail portion 51 Worker

Claims (4)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a work device provided on the upper revolving body so as to be able to be raised and lowered,
The upper swing body has a flat bottom plate and left and right vertical plates extending forward and rearward on the bottom plate, and a swing frame provided with a bracket for mounting the working device at the front end of each vertical plate. And an engine mounted in a horizontally placed state extending in the left and right directions on the rear side of the swivel frame, and a front side of the swivel frame located on one side of the left and right directions across the vertical plate of the swivel frame A cab provided on the front side of the engine, and an oil storage tank disposed on the other side in the left and right directions with the vertical plate of the revolving frame interposed therebetween, and a front side of the oil storage tank and the vertical direction of the revolving frame. In a construction machine provided with an article storage case provided on the opposite side of the cab across a plate,
Between the front end of the swivel frame and the oil storage tank, a lowermost step provided on the front side of the article storage case, and the article located between the lowermost step and the oil storage tank. A plurality of upper steps provided stepwise on the front surface of the storage case, and disposed between the front end of the swivel frame and the oil storage tank along the left and right outer sides of the article storage case, A handrail gripped by an operator who moves up and down each step is provided,
The handrail is
A lower end is fixed to the front end of the revolving frame, a midway portion extends along the left and right outer sides of the article storage case and extends above the article storage case, and the upper end extends near the uppermost step. Side railing,
A handrail connecting member to which the upper end side of the lower handrail portion is fixed;
An upper handrail portion in which a front end side is fixed to the handrail connecting member, a middle portion extends rearward at an upper position of the oil storage tank and is bent toward the cab, and a rear end side is fixed to an upper surface side of the oil storage tank;
The upper handpiece extends upward and downward at a position shifted to the vertical plate side from the position where the lower handrail portion is disposed, and the upper end is fixed to the handrail connecting member, and the lower end is one of the upper steps. Construction machine characterized by comprising an auxiliary handrail portion fixed to the frame.   The upper handrail portion includes a front support whose lower end is fixed to the article storage case and extends upward, and whose upper end is fixed to the handrail connection member, and whose front end is fixed to the handrail connection member and which is the upper end of the front support A horizontal column that extends rearward from the side at an upper position of the oil storage tank and bends toward the cab; and a lower end that extends downward from the rear end side of the horizontal column toward the oil storage tank and is fixed to the upper surface of the oil storage tank The construction machine according to claim 1, comprising a rear post.   The said auxiliary handrail part becomes a structure located in the said operator's side, when the said operator squats down on the said upper step and supplies oil from the supply port provided in the upper surface of the said oil storage tank. The construction machine according to 2. The upper step consists of three steps: a lower step plate, a middle step plate, and an upper step plate,
The construction machine according to claim 1, 2 or 3, wherein a lower end side of the auxiliary handrail portion is configured to be attached to the middle step plate of the upper step.

Images