JP4522379B2 - Swivel work machine - Google Patents

Description

  The present invention relates to a turning work machine such as a backhoe.

Some turning work machines such as backhoes are provided with a driver's seat on a turntable and a steering box provided with a steering lever in front of the driver's seat (for example, Patent Literature 1 or Patent Literature 2).
In this type of conventional turning work machine, a pair of left and right control levers are mounted on the control box so as to protrude upward, and a pilot valve unit is mounted below the control lever in the control box. There is one in which a control valve unit is mounted via a support frame at a distant position (for example, Patent Document 1).

In another conventional turning work machine, a turning frame is erected and fixed on a slewing base, and a steering lever is mounted on the upper end of the standing and fixing turning frame so as to protrude upward. There is one in which a pilot valve unit is mounted below and a control valve unit 88 is mounted on the lower end of the control frame 77 (for example, Patent Document 2).
JP 2002-61229 A JP 2002-285588 A

  Therefore, in the former case, after the steering box and the control valve unit incorporating the pair of control levers and the pilot valve unit are separately mounted on the swivel, respectively, the control box side and the control valve unit side There is a problem that it is necessary to assemble a link, a hose, etc. between them, and that the assembly of the steering mechanism is very troublesome and the work process of the assembly increases.

  In the latter case, after assembling all of the control lever, pilot valve unit, control valve unit, etc. to the control frame, it is difficult to stand the control frame on the swivel. After that, it is necessary to attach the control valve unit etc. to the control frame and assemble the link and hose between the pilot valve unit side and the control valve unit side. There was a problem that the assembly work process increased.

  In view of the above problems, the present invention is such that the assembly of the steering mechanism portion is simple and the number of assembly work steps is reduced.

The technical means of the present invention for solving this technical problem is a turning work machine in which a driver's seat is provided on a swivel base and a control box provided with a control lever is provided in front of the driver's seat.
The control box has a control frame. The control lever is mounted on the upper end of the control frame so that it protrudes upward, the pilot valve unit is mounted below the control lever of the control frame, and the control valve unit is mounted on the lower end of the control frame. The swivel base is provided with support legs for fixing the control frame, and the control frame is placed between the pair of support legs in a state where the control lever, the pilot valve unit and the control valve unit are mounted. And can be fixed with fasteners such as bolts ,
In addition to the control lever, a dozer lever for operating the dozer is provided at the top of the control frame, and a switch for switching the traveling speed between two speeds is provided at the head of the dozer lever .

According to another technical means of the present invention, the control frame includes a horizontal frame, a pair of left and right upper vertical frames protruding upward from the horizontal frame, and an upper frame connected between upper ends of the pair of left and right upper vertical frames. And a pair of left and right lower vertical frames protruding downward from the horizontal frame,
A plurality of control levers are supported on the upper frame of the control frame so as to protrude upward, and a pilot valve unit is attached to the lower surface of the upper frame so that the pilot valve of the pilot valve unit can be operated by the control lever. The control valve unit is supported between the pair of left and right lower vertical frames, and the both ends of the horizontal frame of the control frame are placed between the pair of left and right support legs and fixed by the fasteners .
A support member for supporting various electrical components is attached to the upper front side of the control frame, and the various electrical components and the support member are covered with a cover member of the control box together with the control frame .

Further, according to another technical means of the present invention , a mounting plate is connected and fixed between front lower portions of the pair of lower vertical frames, a multi-valve is mounted on the front side of the mounting plate, and a control valve is mounted on the rear side of the mounting plate. The unit is attached .

  According to the present invention, the control lever, the pilot valve unit, and the control valve unit are mounted on the control frame, and after the link and the hose are assembled between the pilot valve unit side and the control valve unit side, the control frame is It can be mounted between a pair of support legs and can be easily fixed with a fastener such as a bolt, and the assembly of the steering mechanism portion is simple and the assembly work process is reduced.

Hereinafter, the embodiment in which the present invention is applied to an ultra-small turning work machine 1 will be described in detail with reference to the drawings.
As shown in FIGS. 1 and 2, the turning work machine 1 according to the present invention includes an upper turning body 2 and a lower traveling body 3.
The lower traveling body 3 rotatably supports the idler 6, the driving wheel 7, and the plurality of rolling wheels 8 on the side frames provided on the left and right sides of the track frame 5, and the idler 6, the driving wheel 7, and the rolling wheel. The crawler belt 9 is wound around the crawler belt 9, and the crawler belt 9 is allowed to travel in the front-rear direction by rotating the driving wheel 7 by a traveling hydraulic motor so that the crawler belt 9 can circulate and rotate. A traveling device is adopted. The track frame 5 supports the left and right side frames so as to be movable in the left-right direction, and can be expanded / contracted to the left / right by an expansion / contraction hydraulic cylinder (not shown). It is a leg.

In addition, a dozer 10 is provided in front of the lower traveling body 3.
The upper swivel body 2 is composed of a swivel base 11 that is pivotally supported by the lower traveling body 3 about a vertical axis, and a work device 12 that is attached to and supported by the swivel base 11.
The work device 12 includes a boom 14 supported on the swivel base 11 so as to be swingable about the left and right axes, an arm 15 connected to the tip of the boom 14 so as to be swingable about the left and right axes, And a bucket 16 that is pivotably connected to the distal end portion about the left and right axis.

The boom 14 is driven to swing up and down by a boom cylinder 17 interposed between the boom 14 and the arm 15 is driven back and forth by an arm cylinder 18 interposed between the boom 14 and the boom 14. The bucket 16 is driven and swung by a bucket cylinder 19 interposed between the bucket 15 and the arm 15.
The boom 14 includes a first boom member 20 supported by the swivel base 11, a second boom member 21 connected to the distal end portion of the first boom member 20 so as to be swingable left and right around a support shaft, A support bracket 22 is provided at the distal end of the second boom member 21 so as to be swingable left and right around the support shaft. The base end of the arm 15 is connected to the support bracket 22.

  A linkage link 23 is attached across the vicinity of the tip of the first boom member 20 and the support bracket 22. One end of the linkage link 23 is pivotally supported by a pair of upper and lower mounting brackets 24 projecting from the first boom member 20 so as to be swingable around the support shaft, and the other end of the linkage link 23 is supported by the support bracket 22. Are pivotally supported around a support shaft by a pair of upper and lower mounting brackets 25 projecting therefrom. Thereby, the linkage link 23, the first boom member 20, the second boom member 21, and the support bracket 22 constitute a parallel four-link. The parallel quadruple link can translate (offset) the arm 15 in the left-right direction by swinging the second boom member 21 left and right with respect to the first boom member 20 by the offset cylinder 26. Yes.

  The swivel base 11 includes a swivel frame 30 shown in FIG. 4 supported by the lower traveling body 3. As shown in FIGS. 1 to 3, the swivel base 11 includes a support unit 31 that supports the work device 12, and includes a control unit 32 on one side (left side) of the support unit 31, and further supports the support unit 31. A housing space 34 for housing a plurality of vehicle devices is provided on the other side (right side) of the portion 31. An engine room 33 for accommodating the engine E is provided at a position behind the support portion 31, the steering portion 32, and the accommodation space 34.

  As shown in FIG. 4, the swivel frame 30 includes a swivel substrate 35 that forms the bottom plate of the swivel base 11. The swivel board 35 is made of a thick plate material and has a cutout circular shape formed by cutting out the front part and the side part. Further, as shown in FIG. 1, the substantially central portion of the turning board 35 is supported by the track frame 5 of the lower traveling body 3 through a turning bearing 27 so as to be turnable.

As shown in FIGS. 2 and 3, a counterweight 36 is attached and fixed to the rear portion of the turning board 35 via a weight attachment body.
Also, as shown in FIGS. 4 to 6, a pair of left and right vertical ribs 38L and 38R made of a plate material and arranged opposite to each other in the left-right direction are erected by welding or the like on the swivel board 35 on the right side from the left and right center. Has been. The pair of left and right vertical ribs 38 </ b> L and 38 </ b> R are provided from the front part to the middle part of the turning substrate 35. Further, the rear end portions of the pair of left and right vertical ribs 38L and 38R are connected to a lateral rib 39 extending in the left-right direction at the center portion in the front-rear direction of the turning substrate 35.

  As shown in FIGS. 1 and 2, the swivel board 35 is provided with a side cover 43 along the outer edge of the swivel board 35. The side cover 43 includes a first side cover member 43L extending from one (left side) vertical rib 38L to one side (left side) of the counterweight 35, and a counterweight 35 from the other (right side) vertical rib 38R. And a second side cover member 43R extending to the other side (right side).

In the engine room 33, the engine E is disposed horizontally, and a radiator and an oil cooler are disposed on the left side of the engine E. The accommodation space 34 is a space for accommodating vehicle equipment including an oil tank, a fuel tank, a battery, and the like, and is provided between the right vertical rib 38R and the second side cover member 43R.
The engine room 33 and the accommodation space 34 are covered with a bonnet 55. The bonnet 55 includes a side bonnet 56 that covers the accommodation space 34 from the front to the side, a front bonnet 57 that covers the engine room 33 from the front to the side, and a rear bonnet 58 that covers the engine room 33 from the rear. It has. The rear bonnet 58 is pivotally supported to be openable and closable toward the rear of the swivel base 11. Further, a tank cover 59 is provided above the side bonnet 56 so as to open and close the accommodation space 34.

  The control unit 32 is provided in front of the front bonnet 57. In addition, the control unit 32 includes a step 60 provided from the upper end of the first side cover member 43L to the left vertical rib 38L on the control unit side, and a control box 61 is provided at the front of the step 60. Is deployed. The front bonnet 57 is provided with a driver seat 62 through a seat support at a position facing the control box 61.

  As shown in FIGS. 1 and 2, a canopy 63 is provided at a position between the driver's seat 62 and the support portion 31. The canopy 63 includes a side wall portion 64 that partitions the driver seat 62 and the support portion 31, and a top plate portion 65 that projects in a cantilever shape from the upper end portion of the side wall portion 64 toward the upper side of the driver seat 62. It is configured. The side wall portion 64 is configured by bridging a plurality of beam members, a transparent or opaque resin plate, or the like between a pair of front and rear columns 66. Therefore, the swivel base 11 is provided with the driver's seat 62, the control box 61 is provided in front of the driver's seat 62, and the range from the driver's seat 62 to the control box 61 of the swivel base 11 is the control unit 32.

  As shown in FIG. 1 to FIG. 3 and FIG. 7, the control box 61 is arranged at the front part on the swivel base 3, and a lever arrangement part 68 in which an operation lever described later is arranged on the upper end surface of the control box 61. Is provided. A bulging portion 69 that bulges forward to widen the upper end surface of the maneuvering box 61 forward is provided on the upper portion of the maneuvering box 61, and a meter display portion 71 is provided on the upper end surface of the maneuvering box 61 corresponding to the bulging portion 69. The meter display unit 71 is provided in front of the lever arrangement unit 68. The meter display unit 71 is configured to display a plurality of meters such as the rotational speed of the engine E, hour meter, and the like by switching on a digital display. On the lower side of the rear surface of the control box 61, a concave surface portion 70 that is recessed forward is provided in order to widen a lower control space between the driver's seat 62 and the control box 61.

  As shown in FIGS. 1 to 3 and FIGS. 7 to 11, the control box 61 includes a pair of left and right control levers 72 </ b> L and 72 </ b> R protruding upward from the lever arrangement portion 68 as an operation lever, and the control lever 27 </ b> L. , 27R and a pair of left and right traveling levers 73L, 73R, and a dozer lever 75 provided on the side of one control lever 72R. On the head of the dozer lever 75, a switch 76 for switching to the second speed for switching the traveling speed of the turning work machine 1 to the second speed is provided.

The control box 61 includes a control frame 77 and a cover member 78. The control frame 77 includes a horizontal frame 80, a pair of left and right upper vertical frames 81 protruding upward from the horizontal frame 80, and a pair of left and right upper vertical frames 81. And an upper frame 83 connected between the upper ends of the upper and lower frames, and a pair of left and right lower vertical frames 84 projecting downward from the horizontal frame 80.
A pair of control levers 72L and 72R are supported in an upward projecting manner on the upper frame 83 of the control frame 77, and pilot valve units 86L and 86R are attached to the lower surface side of the upper frame 83, and are controlled by the control levers 72L and 72R. The pilot valve units 86L and 86R can be operated, and a control valve unit 88 is supported between a pair of left and right lower vertical frames 84. As a result, the control valve unit 88 is attached to the lower part of the control frame 77, and a pair of control levers 72L and 72R are attached to the upper end portion of the control frame 77 so as to protrude upward, and the control levers 72L and 72R of the control frame 77 are mounted. A pilot valve unit 86 is attached below.

  A mounting plate 90 is connected and fixed between the front lower portions of the pair of lower vertical frames 84, and a multi-valve (or super change valve) 91 is mounted on the front side of the mounting plate 90, whereby the pilot valve unit 86L of the control frame 77 is mounted. , 86R, a multi-valve 91 is mounted. The multi-valve 91 is interposed in the path of pressure oil from the pilot valve units 86L and 86R to the control valve unit 88. By operating the operation part of the multi-valve 91, the multi-valve 91 is controlled from the pilot valve units 86L and 86R to the control valve unit 88. Is to change the operation pattern of the pair of control levers 72L and 72R.

As shown in FIGS. 4 to 6, a pair of left and right support legs 92 and 93 are provided at the front portion of the swivel base 11. Of the pair of support legs 92, 93, the right support leg 93 is configured by a support plate protruding leftward from the left vertical rib 38 </ b> L of the swivel base 11, and the left support leg 92 is swiveled by the swivel base 11. It is composed of an L-shaped support plate protruding upward from the substrate 35.
Both ends of the horizontal frame 80 of the control frame 77 are placed between the pair of left and right support legs 92 and 93 and fixed by a fastener 94 such as a bolt shown in FIGS. 4 and 5. The control frame 77 is detachably attached to the support legs 92, 93 projecting from each other by a fastener 94, and the control frame 77 is inserted into the swivel base 11 with the lower part of the control frame 77 inserted into the swivel base 11. , 93 and a control valve unit 88 provided at the lower part of the control frame 77 is disposed in the swivel base 11.

  As shown in FIGS. 8 and 10, various electric parts 96 such as a sensor, a switch, an indicator lamp, a horn, and a fuse are attached to a T-shaped support member 95, and the support member 95 is bolted to the front side of the control frame 77. Thus, various electrical components 96 are attached to the control frame 77 via the support member 95, and the electrical components 96 are concentrated on the front side of the control box 61.

  As shown in FIG. 7, the cover member 78 of the control box 61 includes a front cover 97, a rear cover 98, and an upper cover 99. The front cover 97, the rear cover 98, and the upper cover 99 are provided on the control frame 77, respectively. The electric parts 96 and the support member 95 are attached separately and covered with a cover member 78 (a front cover 97, a rear cover 98, and an upper cover 99) together with the control frame 77. Therefore, the lever arrangement portion 68 and the meter display portion 71 are formed on the upper surface side of the upper cover 99, the bulging portion 69 is formed across the upper cover 99 and the front cover 97, and the bulging portion 69 is formed inside. Various electrical components 96 are arranged in a concentrated manner. The concave portion 70 is formed on the rear surface side of the rear cover 98.

  The control valve unit 88 is a centralized arrangement of a number of control valves V for controlling pressure oil to a hydraulic actuator such as a swing motor for driving the upper swing body 2 and a cylinder for driving the work device 12. The many control valves V include a mechanically operated type and a pilot operated type. The pair of travel levers 73L, 73R and the dozer lever 75 are operation members that are relatively infrequently used, and are linked to a mechanically operated control valve V via a link and a rod. On the other hand, hydraulic actuators that require frequent and delicate operations such as the swing motor, boom cylinder 17, arm cylinder 18 and bucket cylinder 19 are pilots of pilot valve units 86L and 86R by a pair of left and right control levers 72L and 72R. It is controlled by a pilot operated control valve V through the valve. That is, each control valve V for controlling the swing motor, the boom cylinder 17, the arm cylinder 18 and the bucket cylinder 19 is of a pilot operation type, and is operated by a pair of left and right control levers 72L and 72R. The hydraulic circuit is configured to be switched by pilot pressure oil from the pilot valves of the units 86L and 86R.

  The pair of left and right control levers 72L and 72R are for controlling the working device 12, and of the pair of left and right control levers 72L and 72R, the left control lever 72L is swingable in the front-rear direction and the left-right direction. The left pilot valve unit 86L is supported by the casing, and the control valve V for turning and the control valve V for arm can be controlled by switching the pilot valve in the casing. Also, the right control lever 72R is supported by the casing of the right pilot valve unit 86R so as to be swingable in the front-rear direction and the left-right direction, and by switching the pilot valve in the casing, The boom control valve V and the bucket control valve V can be controlled.

The dozer lever 75 is for moving the dozer cylinder to move the dozer 10 up and down.
As shown in FIG. 2, an opening window 107 is provided at the front of the first side cover member 43L, and this opening window 107 corresponds to the control valve unit 88 and the multi-valve 91 provided in the control box 61, From here, adjustment operation of each control valve V of the control valve unit 88, operation of the multi-valve 91, and the like can be easily performed. Further, the operation pattern can be switched by the opening window 107. Further, by removing the first side cover member 43L from the swivel base 11, maintenance of each control valve V, hydraulic hose, etc. can be facilitated.

  As shown in FIG. 4 to FIG. 6 and FIG. 12, the support frame 108 is erected on the swivel board 35 of the swivel base 11 so as to be located on the side of the driver seat 62. The support frame 108 has a pedestal 109 at the lower end, and the support frame 108 is fixed to the swivel board 35 with bolts or the like via the pedestal 109. An accelerator lever 111 and an unload lever 112 are attached to the support frame 108 so as to be separated from each other in the front-rear direction and positioned on the side of the driver's seat 62, and below the accelerator lever 111 and the unload lever 112 of the support frame 108. In addition, a switching valve 113 is attached, and a switching lever 114 for operating the switching valve 113 is attached so as to be operated up and down. The switching valve 113 is fixed to a mounting plate 115 provided on the support frame 108.

  The accelerator lever 111 controls the rotation of the engine E. The unload lever 112 can be swung upward or forward. By operating the unload lever 112 upward, the unload valve is switched off, and the working device 12 (the arm 15, the boom 14 or the bucket) is operated by the control levers 72L and 72R. 16) Maneuver is disabled. Further, by operating forward, the unloading valve is switched on, and the working device 12 can be operated by the control levers 72L and 72R.

  The switching valve 113 is used to switch the vertical movement of the dozer 6 and the expansion / contraction of the crawler type traveling device. By the vertical operation of the switching lever 114, the vertical movement of the dozer 6 by the dozer cylinder and the crawler type by the expansion / contraction hydraulic cylinder. The circuit is configured to switch between the expansion / contraction operation of the traveling device. An anti-theft unit 117 is attached to the support frame 108. The anti-theft unit 117 is for preventing theft by disabling the operation of the traveling hydraulic motor or the like, for example, by operating the switches 118 and 119 attached to the support frame 108.

  As shown in FIGS. 1, 2, and 13, a cover body 121 that covers the upper side and the outer side of the support frame 108 is provided on the outer side of the driver seat 62. An operation recess 122 that is recessed inward is provided, and the switching lever 114 protrudes from the support frame 108 into the operation recess 122 through the insertion window 122 of the cover body 121 so as to be operable from the driver seat 62. The accelerator lever 111 and the unload lever 112 protrude from the support frame 108 through the insertion windows 124 and 125 of the cover body 121 and above the cover body 121, and the accelerator lever 111 and the unload lever 112 can be operated from the driver seat 62. Further, the switch 118 and the switch 119 can be exposed to the front side of the cover body 121 through the opening window 126 of the cover body 121, and the opening window 126 is closed by a lid body 127 provided on the cover body 121 so as to be freely opened and closed. ing.

  As shown in FIGS. 4 to 6, an interference preventing valve unit 133 is provided between the left end portion of the control box 61 of the swivel base 11 and the support frame 108. The interference prevention valve unit 133 is fixed to a support plate 135 projecting from the left end of the turning substrate 35 with bolts or the like. The interference prevention valve unit 133 is adapted to extend and contract the boom cylinder 17, the arm cylinder 18, and the bucket cylinder 19 so that the bucket 16 and the like of the work device 12 do not interfere with the canopy 63 on the control unit 32 side according to the adjustment operation of the operation unit. This is for regulating the operation.

  According to the above embodiment, the bulging portion 69 bulging forward is provided on the upper portion of the control box 61 so as to expand the upper end surface of the control box 61 back and forth. Since the meter display portion 71 is provided in front of the lever arrangement portion 68 corresponding to the above, an operation space around the driver seat 62 and around the control levers 72L and 72R can be secured, and the driver's residence Or the meter display part 71 can be installed without narrowing the control space. In addition, since the meter display unit 71 is located in front of the lever arrangement unit 68 of the control box 61, compared with the conventional case where the meter display unit is arranged on the side of the driver's seat, the turning work machine is operated. The visibility of the meter is improved.

  In addition, since a plurality of meters such as the rotation speed of the engine E and hour meter are switched and displayed on the meter display unit 71, electronic control parts can be used, and the number of parts of the meter display unit 71 can be increased. As a result, the meter display unit 71 can be made compact, and the maintainability can be improved. Furthermore, since the concave surface portion 70 that is recessed forward is provided on the lower side of the rear surface of the control box 61, the concave surface portion 70 effectively provides a lower control space between the driver's seat 62 and the control box 61. Can be expanded.

  The control frame 77 of the control box 61 is mounted between a pair of support legs 92 and 93 with the control levers 72L and 72R, the pilot valve units 86L and 86R, and the control valve unit 88 mounted thereon. Since the steering levers 72L and 72R, the pilot valve units 86L and 86R, and the control valve unit 88 are mounted on the steering frame 77, the pilot valve units 86L and 86R are connected to the control valve. After assembling a link, a hose, etc. between the unit 88 side, the steering frame 77 can be placed between a pair of left and right support legs 92, 93 and can be easily fixed with a fastener such as a bolt. Assembly of the mechanism part is easy and the assembly work process is reduced.

  In addition, the control frame 77 is placed and fixed between the pair of support legs 92 and 93 in a state where the lower part of the control frame 77 is inserted into the swivel base 11, and the control valve unit 88 provided at the lower part of the control frame 77. Is arranged in the swivel base 11, the control levers 72L and 72R, the pilot valve units 86L and 86R, and the control valve unit 88 can be arranged in a compact control frame 77, and the control box 61 is formed as small as possible. From this point, the driver's residence or maneuvering space can be expanded.

  In addition to the control levers 72L and 72R, a dozer lever 75 for operating the dozer 6 is provided at the upper end of the control frame 77, and a switch 76 for switching the traveling speed to the second speed is provided on the head of the dozer lever 75. Therefore, when the engine E is started and the vehicle travels on the road or when the vehicle travels from the road to the dozer operation, the switch 76 on the head of the dozer lever 75 is pressed to change the travel speed from the first speed. The speed can be easily changed to the second speed or from the second speed to the first speed, and workability such as road running and dozer work can be improved.

  Various electrical components 96 are attached to the control frame 77 via a support member 95, and the various electrical components 96 and the support member 95 are covered by the cover member 78 of the control box 61 together with the control frame 77. Since the electrical component 96 is attached to the front side of the control frame 77 and the electrical component 96 is concentrated on the front side of the control box 61, the electrical component 96 can be easily attached, and the electrical component 96 is placed on the front side of the control box 61. It can be centrally and compactly arranged.

  The cover member 78 of the control box 61 has a front cover 97, a rear cover 98, and an upper cover 99, and the front cover 97, the rear cover 98, and the upper cover 99 are separately attached to the control frame 77, respectively. The front cover 97, the rear cover 98, and the upper cover 99 can be easily attached to and detached from the control frame 77, respectively, and only the necessary portions of the cover can be removed from the control frame 77 for maintenance and the like. Easy and convenient.

  Further, a support frame 108 is erected on the swivel base 11 on the side of the driver's seat 62. The support frame 108 is provided with an accelerator lever 111 for controlling the rotation of the engine E and control levers 72L and 72R. An unload lever 112 for disabling operation of the work device 12 is attached so as to be separated from the front and rear and located on the side of the driver's seat 62, and the accelerator lever 111 and the unload lever 112 of the support frame 108 are A switching valve 113 for switching the vertical movement of the dozer 6 and expansion / contraction of the lower traveling body 3 and a switching lever 114 for operating the switching valve 113 are mounted below the support frame 108. Install accelerator lever 111, unload lever 112, switching valve 113 and switching lever 114 After that, the support frame 108 to which the accelerator lever 111 and the unload lever 112 are attached may be erected on the swivel base 11 at the side of the driver's seat 62, and the accelerator lever 111, the unload lever 112, the switching The mounting of the valve 113 and the switching lever 113 to the swivel base 11 is very simple, and the number of steps for assembling each member can be reduced, and the accelerator lever 111, the unloading lever 112, the switching valve 113, and The switching lever 113 can be concentrated in the side of the driver's seat 62 and arranged compactly, which is very convenient.

  Further, a cover body 121 that covers the upper and outer sides of the support frame 108 is provided, and an operation recess 122 that is recessed rearward and inward is provided on the outer side of the front side of the cover body 121. Since the support frame 108 protrudes into the operation recess 122 so that the driver 62 can operate, the driver of the driver seat 62 can open the front opening of the operation recess 122 while the driver is sitting on the driver seat 62. Alternatively, the switching lever 114 can be easily operated by inserting a hand into the operation recess 122 from the outer side opening. In addition, the accelerator lever 111 and the unload lever 112 protrude above the cover body 121 from the support frame 108 so that they can be operated from the driver seat 62, so that the driver is sitting on the driver seat 62. The driver of the driver seat 62 can easily operate the accelerator lever 111 and the unload lever 112.

  In the above-described embodiment, the bulging portion 69 is provided on the front side of the control box 61, and the meter display portion 71 is provided in front of the lever arrangement portion 68. Instead, this is indicated by a chain line in FIG. As described above, a bulging portion 69 bulging rearward is provided on the upper portion of the control box 61 so as to widen the upper end surface of the control box 61 rearward, and a lever arrangement corresponding to the bulging portion 69 on the upper end surface of the control box 61 is provided. A meter display unit 71 may be provided behind the unit 68.

It is a front view of the turning work machine which shows one embodiment of this invention. It is a left view of the turning work machine. It is a top view of the turning work machine of the state which removed the working device. It is a top view of the turntable. It is a front view of the turntable. It is a left view of the turntable. It is a left view of the same steering box. It is a left view of the state which removed the cover member of the control box. It is a top view in the state where the cover member of the control box was removed. It is a front view of the state which removed the cover member of the control box. It is a rear view in the state where the cover member of the control box was removed. It is a perspective view of lever parts, such as the support frame and an accelerator. It is a perspective view of the cover body front part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turning work machine 3 Undercarriage 10 Dozer 11 Turntable 12 Working device 61 Control box 62 Driver's seat 68 Lever arrangement part 69 Bulging part 70 Concave part 71 Meter display part 72L Control lever 72R Control lever 77 Control frame 78 Cover member 80 Horizontal frame 81 Upper vertical frame 83 Upper frame 84 Lower vertical frame 86L Pilot valve unit 86R Pilot valve unit 88 Control valve unit 91 Multi-valve 92 Support leg 93 Support leg 94 Fastener 95 Support member 96 Electrical component 97 Front cover 98 Rear cover 99 Upper cover 108 Support frame 111 Accelerator lever 112 Unload lever 113 Switching valve 114 Switching lever 117 Anti-theft unit 122 Operation recess

Claims (3)

A swivel work machine in which a driver's seat (62) is provided on the swivel base (11) and a control box (61) including a control lever (72L, 72R) is provided in front of the driver's seat (62).
The control box (61) includes a control frame (77). A control lever (72L, 72R) is mounted on the upper end of the control frame (77) so as to protrude upward, and the control lever (72L, 72L, 72) of the control frame (77) is mounted. 72R) The pilot valve units (86L, 86R) are mounted below, the control valve unit (88) is mounted at the lower end of the control frame (77), and the control frame (77) is fixed to the swivel base (11). Support legs (92, 93) are provided, and the control frame (77) is mounted with a control lever (72L, 72R), a pilot valve unit (86L, 86R) and a control valve unit (88). , Configured to be placed between a pair of support legs (92, 93) and fixed with a fastener (94) such as a bolt ,
In addition to the control levers (72L, 72R), a dozer lever (75) for operating the dozer (6) is provided on the top of the control frame (77). A turning work machine characterized by being provided with a switch (76) for second speed switching . The steering frame (77) is connected between the upper end of a horizontal frame (80), a pair of left and right upper vertical frames (81) protruding upward from the horizontal frame (80), and a pair of left and right upper vertical frames (81). An upper frame (83) and a pair of left and right lower vertical frames (84) protruding downward from the horizontal frame (80),
A plurality of control levers (72L, 72R) are supported on the upper frame (83) of the control frame (77) so as to protrude upward, and a pilot valve unit (86) is attached to the lower surface side of the upper frame (83). Thus, the pilot valve of the pilot valve unit (86) can be operated by the control levers (72L, 72R), and the control valve unit (88) is supported between the pair of left and right lower vertical frames (84). The both ends of the lateral frame (80) of the control frame (77) are placed between the supporting legs (92, 93) of the control frame and fixed by the fastener (94) .
A support member (95) for supporting the various electrical components (96) is attached to the upper front side of the control frame (77), and the various electrical components (96) and the support member (95) are connected to the control box (77) along with the control box (77). 61. The turning work machine according to claim 1, wherein the turning work machine is covered with a cover member (78) of 61) . A mounting plate (90) is connected and fixed between the front lower portions of the pair of lower vertical frames (84), a multi-valve (91) is mounted on the front side of the mounting plate (90), and the rear side of the mounting plate (90). The swing work machine according to claim 2 , wherein a control valve unit (88) is attached to the rotary work machine.

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