JP2015155595A - Handrail device of work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a handrail device of a work machine capable of improving safety of work by securing a required height of a handrail, when an operator executes work on an upper turning body.

SOLUTION: A turning frame 5 is installed on a lower travel body 3 via a turning device 4, and an operator cab 7 is mounted on one side of a front part on the turning frame 5. A power unit is mounted on a rear part of the turning frame 5. A handrail 22 of projecting an apex part upward from an upper surface of an upper turning body 13, is erected in an outside part on the opposite side of a mounting part of the operator cab 7 in the upper turning body 13. An upper surface of the upper turning body 13 inside of the handrail 22, is used as a passage 18 of reaching on the power unit. The handrail 22 is formed as a divided structure of a lower handrail 23 fixed to the upper turning body 13 and an upper handrail 24 installed on this lower handrail 23. The upper handrail 24 is installed to the lower handrail 23 so as to be undulated on the inside of the upper turning body 13. When bringing down the upper handrail 24, the passage 18 is cut off by the upper handrail 24.

COPYRIGHT: (C)2015,JPO&INPIT

Description

  The present invention relates to a handrail device for a working machine such as a hydraulic excavator, and more particularly to a handrail device provided on the opposite side of a cab in an upper swing body so as to protrude from the upper surface of the upper swing body.

  In a working machine such as a hydraulic excavator or a crane, a turning frame is installed on a lower traveling body via a turning device, and a work front is attached to a substantially central portion of the front part of the turning frame. The cab is mounted on one side of the front part of the swivel frame, and a power unit including a prime mover such as an engine and a hydraulic pump driven by the prime mover is mounted on the rear part of the swivel frame. The power unit is covered with a building. To do. In such a working machine, for maintenance and inspection of the equipment such as the prime mover included in the building, climb to the upper swing body from the front side opposite to the cab mounting section of the swing frame, and Open the cover and perform maintenance and inspection work on the motor and other equipment.

  In such a working machine, the upper surface of the upper swing body described above constitutes a passage that extends from the front to the rear in the front-rear direction on the upper swing body. In order to ensure safety when the worker walks on such an upper swing body, a handrail is provided on the outer side opposite to the cab so as to protrude on the upper swing body (for example, Patent Document 1). reference).

  As described in Patent Document 1, when the work implement becomes relatively large, the top of the handrail protruding on the upper swing body is higher than the top of the cab, and when the work implement is mounted on a transport truck and transported, The height of the handrail exceeds the transport limit height. For this reason, in the working machine described in Patent Document 1, the handrail protruding on the upper swing body is divided into a lower handrail and an upper handrail, and the upper handrail is connected to the lower handrail so as to be extendable in the vertical direction. Yes. And by lowering the upper handrail during transportation, the total height of the height of the work equipment added to the height of the platform of the transport truck will be less than the transport limit height, and conversely, during the work, the upper handrail will be raised, The upper handrail is fixed to the lower handrail.

JP-A-9-242122

  However, as described in Patent Document 1, in the case where the handrail is configured to be vertically extendable, when performing maintenance and inspection of the power unit or the like, forgetting to extend the handrail, the handrail protects the worker. There is a risk that it will no longer play a role. Also, in the case of a structure in which the upper handrail is fixed to the lower handrail with bolts, a fixing tool is required, so the work of fixing and separating becomes troublesome, and maintenance and inspection work can be performed with the upper handrail lowered. There is also a risk of doing it.

  In view of the above-described problems of the prior art, the present invention provides a working machine capable of improving the safety of work by ensuring a necessary height of a handrail when an operator works on an upper swing body. An object is to provide a handrail device.

The handrail device of the working machine according to claim 1 is provided with a turning frame on a lower traveling body via a turning device,
A driver's cab is mounted on one side of the front part on the swivel frame, and a power unit is mounted on the rear part.
A handrail whose top protrudes upward from the upper surface of the upper swing body on the outer side of the upper swing body on the side opposite to the mounting portion of the driver's cab,
In the handrail device of the working machine that uses the upper surface of the upper swing body inside the handrail as a passage extending from at least an intermediate portion in the front-rear direction of the upper swing body to the power unit,
The handrail has a divided structure composed of a lower handrail fixed to the upper swing body and an upper handrail attached to the lower handrail,
The upper handrail is attached to the inner side of the upper revolving body with respect to the lower handrail so as to be able to undulate,
When the upper handrail is tilted inside the upper swing body, the passage is blocked by the upper handrail.

The handrail device for a work machine according to claim 2 is the handrail device for the work machine according to claim 1,
A mounting plate is provided at the base of the upper handrail,
A bracket for pivotally mounting the base part of the upper handrail to the lower handrail is provided,
A pin hole for fixing the upper handrail is provided in the bracket and the mounting plate,
A fixing pin that is inserted into each pin hole of the mounting plate and the bracket and fixes the upper handrail in a standing posture or a lying posture is provided to be movable with respect to the guide tube fixed to the mounting plate. Features.

The handrail device for a work machine according to claim 3 is the handrail device for the work machine according to claim 2,
The bracket or the mounting plate is provided with a vertically long slot, and the mounting plate or the bracket is provided with a shaft that is slidably fitted into the slot.
In the state where the upper handrail is erected and the fixing pin is separated from the pin hole of the bracket, the upper handrail can move up and down, and in the state where the upper handrail is pulled up, the upper handrail is centered on the axis. It is characterized by being able to fall inside the upper swing body.

  According to the first aspect of the present invention, since the upper handrail is attached to the lower handrail so as to be able to undulate inside the upper swing body, the height of the lower handrail when the work implement is mounted on the transport truck is determined as the transport height. It is possible to clear the transport limit height by defeating the upper handrail below the limit. In addition, it is impossible to go to the power unit when the upper handrail is tilted, and it is possible to pass only when the upper handrail is raised, so the handrail is always lifted during maintenance and inspection, improving safety. To do.

  In the invention of claim 2, since the upper handrail can be fixed to the lower handrail only by operating the fixing pin, it is not necessary to use a tool when raising and lowering the upper handrail. Further, it is not necessary to remove the upper handrail, and management becomes easy.

The invention of claim 3 is a structure in which the upper handrail can be raised and lowered only when the upper handrail is pulled up. According to this structure,
The projecting width of the bracket to the inside of the upper swing body can be narrowed, and the connecting portion between the lower handrail and the upper handrail can be configured compactly.

It is a side view which shows an example of the working machine to which the handrail apparatus of this invention is applied in a transport state. It is a top view of the working machine of FIG. It is a front view which abbreviate | omits the work front of the working machine of FIG. It is a front view which shows the handrail apparatus of this embodiment. It is E arrow line view of FIG. It is the elements on larger scale of FIG. It is a figure which isolate | separates and shows the upper handrail and lower handrail which are shown in FIG. It is the elements on larger scale of FIG. In this embodiment, it is E arrow equivalent view which shows only the bracket of a lower handrail. In this embodiment, it is an E arrow equivalent view which shows the attachment part to the lower handrail of an upper handrail. It is a front view which shows the handrail of this embodiment in an upper handrail raising state. It is a front view which shows the handrail of this embodiment in an upper handrail fall state. In this embodiment, it is a top view which shows a part of upper revolving body in a handrail fall state.

  1 is a side view showing an example of a working machine to which the handrail device of the present invention is applied in a transported state, FIG. 2 is a plan view of the working machine of FIG. 1, and FIG. 3 is a work machine of FIG. FIG. In these drawings, 1 is a work machine, and 2 is a transport truck on which the work machine 1 is mounted. The work machine 1 installs a turning frame 5 on a lower traveling body 3 via a turning device 4, and attaches a working front 6 to a front mounting portion 5 a provided at the center of the front portion of the turning frame 5. The cab 7 is mounted on one side of 5 (left side in the illustrated example).

  A power unit composed of a prime mover such as an engine or a hydraulic pump (not shown) is mounted on the rear portion of the swing frame 5, and this power unit is covered with a building 8 (see FIG. 2). A weight 9 is mounted. In FIG. 2, 8a is a cover which covers a motor | power_engine, This cover 8a can be opened and closed centering on the hinge 8b. A cover 8c covers a hydraulic pump or the like driven by a prime mover. Reference numeral 8d denotes a part of the building where an operator rides during maintenance inspection and repair of the prime mover and the like.

  Reference numeral 10 denotes a fuel tank, and 11 denotes a hydraulic oil tank. These are mounted on the revolving frame 5 on the opposite side (right side) of the cab 7 and on the front portion of the revolving frame 5. Reference numeral 12 denotes a driving motor (not shown) provided in the lower traveling body 3, a turning motor (not shown) of the turning device 4, and an actuator (hydraulic cylinders 15a, 16a, 17a described later) for operating the working front 6. This is a front cover that covers equipment such as a control valve (not shown). The upper swing body 13 is configured by the swing frame 5 and the devices indicated by reference numerals 7 to 12 mounted on the swing frame 5.

  The work front 6 includes a boom 15, an arm 16, a bucket 17, and hydraulic cylinders 15a, 16a, and 17a for raising and lowering these. In addition, in order to perform an operation different from the excavation operation performed by the hydraulic excavator, the operation may be performed by attaching another work tool to the arm 16 instead of the bucket 17.

  Next, a passage provided on the upper swing body 13 will be described. Reference numerals 19 a to 19 c are steps provided on the front cover 12, and are provided for raising and lowering the building 8, the fuel tank 10, and the hydraulic oil tank 11. 20 is a handrail used when an operator goes up and down by placing his / her feet on these steps 19a to 19c. The handrail 20 has a lower end fixed to the revolving frame 5 and an upper portion fixed to the front cover 12. Install. In FIG. 2, reference numeral 18 denotes a passage from the ground to the building portion 8 d where an operator rides for maintenance and inspection of the prime mover and the like. In this embodiment, the passage 18 is a front portion of the upper swing body 13. Is provided.

  Reference numeral 22 denotes a handrail provided so that the top portion projects onto the fuel tank 10 so as to be continuous with the handrail 20. The handrail 22 includes a lower handrail 23 and an upper handrail 24. As shown in FIGS. 1 and 3, when the upper handrail 24 is raised, the top portion of the upper handrail 24 is mounted on the transport truck 2. Is set higher than the transport limit height H.

  4 is a front view of the handrail 22, and FIG. 5 is a view as viewed from the direction of arrow E in FIG. 4. As shown in FIG. 5, the lower handrail 23 has a horizontal pipe portion 23b at the top of the vertical pipe portion 23a. As shown in FIG. 4, the lower handrail 23 passes a bolt 25 through a leg plate 23 c welded to a root portion of the vertical pipe portion 23 a, and the bolt 25 is screwed to a mounting seat 10 a provided on the upper surface of the fuel tank 10. Screw into the hole and fix.

  A bracket 26 for attaching the base portion of the upper handrail 24 is fixed by welding (or bolts) on the inner side of the upper part of the left and right vertical pipe portions 23a of the lower handrail 23 (the left side on the cab 7 side). The upper handrail 24 integrally has a horizontal pipe portion 24b at the top of the left and right vertical pipe portions 24a, and a mounting plate 27 for attaching the upper handrail 24 to the bracket 26 so as to be able to fall inward is provided at the root of the vertical pipe portion 24a. Provide. Further, the coupling frame 24c is attached between the left and right mounting plates 27, 27 by welding both ends thereof.

  6 is a front view showing the coupling structure of the bracket 26 and the mounting plate 27, FIG. 7 is an exploded front view thereof, FIG. 8 is a view corresponding to the arrow E showing the coupling structure of the bracket 26 and the mounting plate 27, and FIG. FIG. 10 is a view corresponding to E arrow showing an attachment portion to the lower handrail 23 of the upper handrail 24. FIG.

  As shown in FIGS. 6 to 9, the bracket 26 includes a back plate portion 26 a that is fixed to the lower handrail 23, a bottom plate portion 26 b, and a front plate portion 26 c that is raised below the back plate portion 26 a from the tip of the bottom plate portion 26 b. And a back plate portion 26a, a bottom plate portion 26b, and a front plate portion 26c and a vertical plate portion 26d having a peripheral portion welded thereto. A shaft 26e for rotatably mounting the mounting plate 27 is fixed to the upper portion of the vertical plate portion 26d so as to protrude from both sides of the vertical plate portion 26d. Reference numerals 26f and 26g denote pin holes into which the below-described fixing pins 29 are inserted. One pin hole 26f inserts the fixing pin 29 when the upper handrail 24 is raised, and the other pin hole 26g is the upper handrail. The fixing pin 29 is inserted when the 24 is tilted inside the upper swing body 13.

  The mounting plate 27 provided at the root portion of the upper handrail 24 includes an L-shaped upper plate portion 27a welded to the root portion of the upper handrail 24, and two vertical plate portions 27b and 27b welded to the upper plate portion 27a. Prepare. The vertical plate portions 27b and 27b are fitted so as to sandwich the vertical plate portion 26d of the bracket 26 therebetween. Reference numeral 27c denotes a vertically long hole provided in each vertical plate portion 27b, and a shaft 26e provided in the bracket 26 is slidably fitted into the long hole 27c. Reference numeral 27 d denotes a pin hole provided in the vertical plate portion 27 b for inserting the fixing pin 29.

  Reference numeral 30 denotes a guide cylinder in which a fixing pin 29 is slidably fitted. The guide cylinder 30 is fixedly attached to the coupling frame 24c by welding (or may be bolted). Reference numeral 29a denotes a knob-like operation portion provided so as to project from the fixing pin 29 in the radial direction. Reference numeral 30a denotes a guide groove provided in the longitudinal direction of the guide tube 30 to guide the operation portion 29a so as to be slidable. Reference numeral 30b denotes a fixing groove into which the operation portion 29a is fitted when the fixing pin 29 is inserted into the pin hole 26f or 26g of the bracket 26 and the upper handrail 24 is fixed. Reference numeral 30c denotes a fixing groove into which the operation portion 29a is fitted in order to maintain the state in which the fixing pin 29 is extracted from the pin hole 26f or 26g of the bracket 26 and the upper handrail 24 can be rotated.

  In this configuration, when the work machine is working, the upper handrail 24 is set in an upright state as shown by a solid line in FIG. At this time, as shown in FIGS. 6 and 8, the vertical plate portion 26d of the bracket 26 is sandwiched between the two vertical plate portions 27b and 27b of the mounting plate 27, and the vertical direction of the mounting plate 27 is set. The plate portions 27b and 27b are fitted into a portion of the bracket 26 surrounded by the back plate portion 26a, the bottom plate portion 26b, and the front plate portion 26c. The fixing pin 29 is maintained in an upright state by being inserted into the pin hole 26 f of the bracket 26 through a pin hole 27 d provided in one vertical plate portion 27 b of the mounting plate 27.

  When the work implement is mounted on the transport truck 2 as shown in FIG. 1 and transported, the upper swing body as shown by a two-dot chain line in FIG. 4 is used so that the handrail 22 does not exceed the transport limit height H. Tilt inside 13 and transport. In this case, the operation portion 29 a of the fixing pin 29 is pinched and removed from the fixing groove 30 b of the guide groove 30, the operation portion 29 a is moved along the guide groove 30 a, and the fixing pin 29 is pulled out from the pin hole 26 f of the bracket 26. And the operation part 29a is fitted in the fixing groove 30c, and the state where the fixing pin 29 is pulled out from the pin hole 26f is maintained.

  Next, when a force is applied in the pulling direction of the upper handrail 24 as indicated by an arrow Y in FIG. 11, the upper handrail 24 is lifted while the long hole 27c provided in the mounting plate 27 slides on the shaft 26e of the bracket 26. . In a state where the lower end of the long hole 27 c is pulled up to a height at which it abuts on the shaft 26 e of the bracket 26, the vertical plate portion 27 b comes out slightly above the front plate portion 26 c of the bracket 26.

  When the upper handrail 24 is rotated as indicated by the arrow R from this state, the upper handrail 24 and the upper handrail 24 bracket 26 are centered on the shaft 26e of the upper handrail 24 bracket 26 and fall on the inner side of the upper swing body 13. When the upper handrail 24 is tilted in this manner, the upper plate portion 27a provided at the base portion of the upper handrail 24 is placed on the front plate portion 26c of the bracket 26 as shown in FIG. In this state, the pin hole 26g of the bracket 26 is configured to coincide with the pin hole 27d of the vertical plate portion 27b. Therefore, the operation portion 29 a of the fixing pin 29 is pinched, the fixing pin 29 is slid along the guide groove 30 a in the guide tube 30, and the fixing pin 29 is inserted into the pin hole 26 g of the bracket 26. In this state, as shown in FIG. 13, the upper handrail 24 blocks the passage 18 to the rear power unit side on the upper swing body 13.

  Thus, in a state where the passage 18 is blocked by the upper handrail 24, the operating portion 30a is turned in the circumferential direction of the guide tube 30 to fit the operating portion 30a into the fixing groove 30b, whereby the fixing pin 29 is pinned by vibration or the like. Prevents it from falling off 20g. Thus, in the state in which the upper handrail 24 is tilted, the upper handrail 24 is lower than the top of the lower handrail 23, so that the handrail 22 can be set to a transport restriction height H or less.

  As described above, since the upper handrail 24 is attached to the lower handrail 23 so as to be able to rise and fall inside the upper swing body 13, the upper handrail 24 is tilted when the work implement 1 is mounted on the transport truck 2. This makes it possible to clear the transport limit height H. Further, when the upper handrail 24 is tilted, the passage 18 to the power unit side in the upper swing body 13 cannot be moved, and the passage can be performed only when the upper handrail 24 is raised. For this reason, the worker is forced to move to the rear portion of the upper swing body 13 after setting up the upper handrail 24, and in the maintenance inspection work, the upper handrail 24 is always lifted up and the safety is improved.

  In this embodiment, since the upper handrail 24 can be fixed to the lower handrail 23 only by operating the fixing pin 29, it is not necessary to use a tool when raising and lowering the upper handrail 24. Further, it is not necessary to remove the upper handrail 24, and management becomes easy.

  Further, in this embodiment, the upper handrail 24 is slidably fitted to the shaft 26e of the bracket 26 so that the elongated hole 27c provided in the vertical plate portion 27b of the mounting plate 27 is slid and the upper handrail 24 is pulled up. Can be undulated. According to this structure, the protrusion width to the inner side of the upper swing body 13 of the bracket 26 can be narrowed, and the joint portion between the lower handrail 23 and the upper handrail 24 can be configured compactly. Note that the structure in which the upper handrail 24 is attached to the lower handrail 23 so as to be movable up and down is not provided with the shaft 26e on the bracket 26, but the shaft is provided on the mounting plate 27 so that the shaft can slide on the bracket 26. A structure in which a long hole to be fitted is provided can also be adopted.

  Although the present invention has been described with reference to the embodiment, when the present invention is carried out, the structure in which the upper handrail 24 is attached to the lower handrail 23 so that it can be raised and lowered is simply the center of the mounting plate 27 with respect to the bracket 26. It is also possible to adopt a structure that undulates as Further, as a path reaching the power unit, a path provided inside the handrail on the upper surface of the upper swing body may be provided from an intermediate portion instead of a front portion in the front-rear direction of the upper swing body. Moreover, when implementing this invention, a various change and addition are possible not only in the said embodiment but in the range which does not deviate from the summary of this invention.

1: working machine, 2: transport truck, 3: lower traveling body, 4: turning device, 5: turning frame, 6: front for work, 7: cab, 8: building, 9: counterweight, 10: fuel tank 11: Hydraulic oil tank, 12: Front cover, 13: Upper turning body, 19a to 19c: Step, 20: Handrail, 22: Handrail, 23: Lower handrail, 24: Upper handrail, 26: Bracket, 26a: Back Plate part, 26b: Bottom plate part, 26c: Front plate part, 26d: Vertical plate part, 26e: Shaft, 26f, 26g: Pin hole, 27: Mounting plate, 27a: Upper plate part, 27b: Vertical plate part, 27c: Long hole, 27d: pin hole, 29: fixed pin, 29a: operation section, 30: guide tube, 30a: guide groove, 30b, 30c: fixed groove, 31: coupling frame

Claims (3)

A turning frame is installed on the lower traveling body via a turning device,
A driver's cab is mounted on one side of the front part on the swivel frame, and a power unit is mounted on the rear part.
A handrail whose top protrudes upward from the upper surface of the upper swing body on the outer side of the upper swing body on the side opposite to the mounting portion of the driver's cab,
In the handrail device of the working machine that uses the upper surface of the upper swing body inside the handrail as a passage extending from at least an intermediate portion in the front-rear direction of the upper swing body to the power unit,
The handrail has a divided structure composed of a lower handrail fixed to the upper swing body and an upper handrail attached to the lower handrail,
The upper handrail is attached to the inner side of the upper revolving body with respect to the lower handrail so as to be able to undulate,
A handrail device for a working machine, wherein the upper handrail is configured to block the passage when the upper handrail is tilted inside the upper swing body. In the handrail device of the working machine according to claim 1,
A mounting plate is provided at the base of the upper handrail,
A bracket for pivotally mounting the base part of the upper handrail to the lower handrail is provided,
A pin hole for fixing the upper handrail is provided in the bracket and the mounting plate,
A fixing pin that is inserted into each pin hole of the mounting plate and the bracket and fixes the upper handrail in a standing posture or a lying posture is provided to be movable with respect to the guide tube fixed to the mounting plate. A handrail device for a working machine. The handrail device for a work machine according to claim 2,
The bracket or the mounting plate is provided with a vertically long slot, and the mounting plate or the bracket is provided with a shaft that is slidably fitted into the slot.
In the state where the upper handrail is erected and the fixing pin is separated from the pin hole of the bracket, the upper handrail can move up and down, and in the state where the upper handrail is pulled up, the upper handrail is centered on the axis. A handrail device for a working machine, characterized in that it can fall on the inside of an upper swing body.

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