JP2009235797A - Structure of control section of work machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily attach and detach a first valve and a second valve to and from a steering bracket and easily maintain these valves. <P>SOLUTION: A control stand 21 is secured to a frame 6. An operator's seat 8 is disposed on the control stand 21. A control device 23 is disposed on one side of the operator's seat 8. The control device 23 comprises the first valve 46 and the second valve 47 on the control bracket 45. A plurality of projections 45a-45d project from the control bracket 45 from a vertical wall 45A vertically installed on the control stand 21 to the side. Mounting parts 50, 51 for mounting the first valve 46 and the second valve 47 from the left side and the right side are formed on the projections 45a-45d, respectively. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control unit structure of a work machine such as a backhoe, a skid loader, or a truck loader used for construction work, civil engineering work, and the like.

  In this type of prior art, an excavator is provided at the front of a swivel mounted on a traveling device so as to be able to swivel about a vertical axis, a control table is fixed on the swivel, and a driver's seat is placed on the control table. The engine is mounted on the rear of the swivel, the hydraulic oil tank is mounted on the right side of the swivel, a partition wall is provided between the hydraulic oil tank and the driver's seat, and left and right sides of the driver's seat. The left and right steering device is equipped with a main control valve that is operated by an operation lever so that the swivel can be turned and the boom, arm, bucket, etc. of the excavator can be operated. (For example, refer to Patent Document 1).

The right steering device is for operating the boom and bucket of the excavator, and a box-shaped control bracket is fixed to a control table equipped with only a driver's seat through a stay, and a main control valve is attached to the control bracket. A work tool operation valve for operating the dozer is attached to the opposite side of the bracket to the driver's seat.
JP 2002-149255 A

The right steering device of the above prior art has a wide left and right width because the steering bracket is box-shaped, and the maintenance is such that the main steering valve, the work tool operation valve, etc. are attached and detached while connected to the hose while the steering bracket is fixed. It has become difficult to do.
An object of the present invention is to provide a control structure for a working machine that can solve the problems of the conventional technology.
According to the present invention, the first valve and the second valve are supported by the cantilever in a cantilever manner and can be attached from the side so that the first valve and the second valve can be easily attached / detached and maintained. An object is to provide a partial structure.

Specific means for solving the problems in the present invention are as follows.
Firstly, a control table 21 is fixed on the fuselage 6, a driver's seat 8 is arranged on the control table 21, and a control device 23 is arranged on one side of the driver's seat 8. Is provided with a first valve 46 and a second valve 47 in the steering bracket 45,
The control bracket 45 projects a plurality of protrusions 45a to 45d laterally from a vertical wall 45A provided upright on the control table 21, and the first valve 46 and the second valve are projected to the plurality of protrusions 45a to 45d. The attachment parts 50 and 51 to which 47 is attached from the left and right sides are formed.

Secondly, the control bracket 45 has a plurality of protrusions 45a to 45d projecting from the vertical wall 45A to the driver's seat 8 side by integral molding, and the mounting portion 50 of the first valve 46 is located on the driver's seat 8 side. The front opening has an attachment opening 50a, and the attachment portion 51 of the second valve 47 has an attachment opening 51a on the side of the driver's seat 8 side.
Thirdly, the control device 23 is attached to the upper surface of the control table 21 from above.
[Action]
The control bracket 45 has a plurality of protrusions 45a to 45d protruding from the vertical wall 45A standing on the control table 21 to the side, and the first valve 46 and the second valve 47 are attached thereto. And the second valve 47 are supported in a cantilevered manner, and can be detached from the side. The first valve 46 and the second valve 47 can be easily detached and maintained, and the area occupied by the control unit can be made compact. it can.

The steering bracket 45 can be easily manufactured by integrally forming the vertical wall 45A and the plurality of projecting portions 45a to 45d, and is attached to the mounting portion 50 of the first valve 46 and the mounting portion 51 of the second valve 47. Since the mounting openings 50a and 51a are respectively formed, the first valve 46 and the second valve 47 can be easily inserted / removed from the side instead of the vertical direction, and maintenance is facilitated.
Since the control device 23 is attached to the upper surface of the control table 21 from above, the control device 23 can be easily attached and detached, no dead space is created below the control device 23, and the area occupied by the control unit is compact. Can be.

  According to the present invention, the first valve and the second valve can be easily attached to and detached from the control bracket.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIGS. 19 and 20, reference numeral 1 denotes a backhoe exemplified as a work machine (swivel work machine). The backhoe 1 includes an upper swing body (upper structure) 2, a lower travel device 3 of the swing body 2, It mainly comprises a dozer device 5 as a work tool attached to the front portion of the traveling device 3 and an excavation device 7 as a work device attached to the front portion of the swivel body 2.
The traveling device 3 includes a crawler wound around an idler disposed on one side of the front and rear, a drive wheel disposed on the other side, and a plurality of wheels disposed between the idler and the drive wheel. A crawler type traveling device is employed in which crawler traveling bodies 4 each including a belt are provided on both left and right sides, and the driving wheels of the left and right crawler traveling bodies 4 are respectively driven by hydraulic traveling motors.

The dozer device 5 is mounted on the front portion of the traveling device 3 so as to be swingable up and down, and is swung up and down by a dozer cylinder formed of a hydraulic cylinder.
The swivel body 2 has a swivel base (machine body) 6 that is supported on the travel device 3 so as to be swivel about the longitudinal axis X and that can be swung left and right by a hydraulic swivel motor. A driver's seat 8 is arranged at the approximate center in the front-rear direction on 6, the engine E is mounted on the rear of the swivel 6, and the hydraulic oil tank T and the control valve Q are mounted on the right side of the swivel 6. A horizontal partition wall 11B is provided between T and the driver's seat 8, and steering devices 22 and 23 are disposed on the left and right sides of the driver's seat 8, respectively.

The swivel base 6 is equipped with an excavator 7 at the front, and a counterweight W in addition to the engine E at the rear to balance the weight with the excavator 7 and the like.
The engine room in which the engine E, the hydraulic pump, the air cleaner, and the like on the rear side of the swivel base 6 are arranged is partitioned by a front and rear partition wall 11A that is fixed between the driver seat 8 and the rear side and the left side are rear. The hood 10A and the left cover body 10B are respectively covered.
The tank room in which the hydraulic oil tank T, the control valve Q, the radiator and the like on the right side of the swivel base 6 are arranged is partitioned by a horizontal partition wall 11B that is fixed to the driver's seat 8 on the left side. Are covered by the right cover body 10C.

In the excavator 7, a swing bracket 13 is supported by a support bracket 12 fixed to the front part of the swivel base 6 so that the swing bracket 13 can swing left and right around a vertical axis. The swing bracket 13 is supported by a hydraulic swing cylinder. Is swung.
The excavator 7 includes a boom 14 that is swingably supported by a swing bracket 13 in an up-and-down direction, an arm 15 that has a base side swingably supported on the distal end side of the boom 14, and a distal end side of the arm 15. The bucket 16 is attached so as to be able to perform a squeeze / dump operation, and can be operated by a boom cylinder 17, an arm cylinder 18, and a bucket cylinder 19 each made of a hydraulic cylinder.

1-3 and 18-20, the control part S on the turntable 6 is partitioned by the front and rear partition walls 11A and the horizontal partition wall 11B, and the driver's seat 8 is on the front side of the front and rear partition walls 11A and sideways. A pair of left and right traveling operation levers SL and SR for operating the left and right crawler traveling bodies 4 separately or simultaneously are disposed in front of the driver's seat 8 and arranged on the left side of the partition wall 11B. There are betals.
A cabin 20 surrounding the control unit S is mounted on the swivel base 6. The cabin 20 has a rear lower portion formed by the front and rear partition walls 11A. Although the right side wall of the cabin 20 exists, the horizontal partition wall 11B may also be used. An opening / closing door 20 </ b> A is provided at the entrance / exit 20 a of the cabin 20.

Instead of the cabin 20, a two-poster-type lops or a four-poster type canopy (a driver's seat protection device with an awning) may be mounted.
1 to 7, the control unit S has a control table 21 provided on a turntable 6, and a driver's seat 8 and left and right control devices 22 and 23 are mounted on the control table 21. The driver's seat 8, the left steering device 22 and the right steering device 23 are each independently configured and assembled.
The control table 21 has a U-shape that is open downward when viewed from the front, and has a substantially flat upper surface portion 21A and left and right leg portions 21L and 21R, and is below the upper surface portion 21A and between the left and right leg portions 21L and 21R. The storage space 21B is open to the front, and the vehicle equipment K is stored in the storage space 21B.

On the upper surface of the control table 21, a placement portion 21a of the driver's seat 8, a placement portion 21b of the left steering device 22, and a placement portion 21c of the right steering device 23 are formed, and the respective placement portions 21a to 21c. The driver's seat 8, the left steering device 22, and the right steering device 23 are mounted on 21c, and are fixed by fasteners such as bolts. The driver's seat 8 is wider than the cushion 8B in the lateral width of the seat surface of the seat 8A.
The left leg portion 21L substantially corresponds to the left side surface of the left steering device 22, the right leg portion 21R substantially corresponds to the right side surface of the right steering device 23, and the right steering device from the left side surface of the left steering device 22. The entire range up to the right side surface of 23 is formed on the control table 21.

That is, the left steering device 22 is disposed on the left side of the driver's seat 8, the surface opposite to the driver's seat 8 side is close to the left end of the control table 21 in the left-right direction, and the right steering device 23 is It is arranged on the right side of the driver's seat 8, and the surface on the opposite side to the driver's seat 8 side is close to the right end of the cab 21 in the left-right direction.
The cockpit 21 is made of sheet metal and has a driver seat mounting portion 21a, a left steering device mounting portion 21b (one steering device mounting portion), and a left leg portion 21L (one leg portion). 1 member P1, and the 2nd member P2 which has the right steering device mounting part 21c (the other steering device mounting part) and the right leg part 21R (the other leg part), The driving | operation of the 1st member P1 The end portion of the seat placement portion 21a and the end portion of the right steering device placement portion 21c of the second member P2 are vertically overlapped and connected via bolts or the like.

  The second member P2 is disposed on the rear side of the partition plate P2a at the end on the first member P1 side, the intermediate plate P2b that is connected to the partition plate P2a and the right leg portion 21R, and partitions the upper and lower sides. A back plate P2c (shown in FIGS. 6 and 16), and the storage space 21B is divided into a space inside the first member P1 and a space inside the second member P2, An air conditioner device K1 is arranged as a vehicle device K inside, and an electric box K2 containing a relay, a fuse and the like is arranged inside the second member P2. Further, other vehicle equipment K can be accommodated inside the second member P2.

The storage space 21B inside the first member P1 is a wide space from the lower side of the driver's seat 8 to the lower side of the left steering device 22, and the air conditioner device K1 can store a large one, and the second member P2 Since the internal storage space 21B is partitioned from the space where the air conditioner K1 is arranged by the partition plate P2a, the intermediate plate P2b, and the back plate P2c, it becomes an optimum environment for storing equipment such as the electric box K2 that dislikes heat, moisture, and the like. ing.
The left steering device 22 can be turned upward (upward) via a turning mechanism 29. This is because the left side of the driver's seat 8 (the diagonally left front side of the driver's seat 8, that is, the front side of the left steering device 22) is the entrance / exit 20 a, so that the left steering device 22 is not disturbed. By turning upward, the entrance / exit 20a can be retreated to be wide.

1 to 4 and 6 to 14, the left control device 22 supports a control box 26 on a support bracket 25 fixed to the control table 21 via a horizontal shaft 27, and the left control valve is supported on the control box 26. 28 and a rotation mechanism 29 are provided.
The support bracket 25 has a substantially inverted T-shape when viewed from the front, and includes a horizontal mounting portion 25A and a support portion 25B erected from a midway in the left-right direction of the mounting portion 25A. 21 is mounted and fixed on the upper surface portion 21A.
The mounting portion 25A and the rotation mechanism 29 of the support bracket 25 are located within the left-right width of the control box 26, and the rotation mechanism 29 is positioned higher than the mounting portion 25A.

The control box 26 is welded with a right plate member 26b forming a right side wall and a back wall on a left plate member 26a forming a left side wall, and a mounting plate 26c is fixed to a front portion thereof, and is attached to an inner surface of the right side wall of the right plate member 26a. The bearing plate 26d is fixed and formed in a box shape, and the left side surface of the left plate member 26a is arranged so as to be substantially flush with the left leg portion 21L of the control table 21 or close in the left-right direction. The interval between the left and right plate members 26a, 26b is narrower than the width of the mounting plate 26c.
In this steering box 26, a mounting portion 26A for the left steering valve 28 is formed on the front upper mounting plate 26c. The mounting portion 26A is a left front side portion of the left steering valve 28 (a front side portion opposite to the driver's seat 8 side). ), A mounting opening 26B that is mounted at three points, the left rear side and the right rear side, and that opens to the right front side from the left front side to the right rear side, and through this mounting opening 26B, the driver's seat The left control valve 28 can be inserted and removed from the front right side which is the 8 side. The left control valve 28 is a pilot valve for turning and arm operation, and is operated by a left operation lever 30.

The support portion 25B of the support bracket 25 is provided with a horizontal shaft 27 having a horizontal axis, and a boss portion 26C is formed by a left plate member 26a and a bearing plate 26d at the rear lower portion of the control box 26 of the left control device 22. The boss portion 26C is externally fitted to the horizontal shaft 27 so as to be rotatable about the axis, thereby allowing the left steering device 22 to rotate about the horizontal axis 27 about the horizontal axis. The horizontal shaft 27 is used as a pivot for the left steering device 22.
Further, a base portion of the cam body 33 is pivotally supported at the rear portion of the control box 26 via a pivot shaft 32, and the base portion of the unload lever 31 is fixed to the tip of the cam body 33. The unload lever 31 extends from the vicinity of the support portion 25B to the front upper side of the control box 26, and is arranged to be an obstacle to getting on and off.

A cam groove 34 is formed in the cam body 33 from the base side to the tip, and a guide pin 35 having a horizontal axis is projected from the support portion 25B of the support bracket 25. The cam groove 34 is fitted to 35 via a cam follower.
The cam groove 34 includes a first cam groove 34A formed on the base side and a second cam groove 34B extending from the first cam groove 34A to the distal end side. The first cam groove 34A is formed in an arc shape centered on the axis of the pivot 32, and the second cam groove 34B is in a state where the unload lever 31 is rotated from the position shown in FIG. 10 to the position shown in FIG. , It is formed to have an arc shape centered on the axis of the horizontal axis 27.

Since the pivot shaft 32 is located at the rear upper side of the horizontal shaft 27 and the guide pin 35 is located at the front upper side of the horizontal shaft 27 and at an intermediate height between the pivot shaft 32 and the horizontal shaft 27, the cam body 33 is pivoted 32. The cam groove 34 is formed to have a length capable of rotating the control box 26 at a necessary angle, for example, about 50 °.
A stay 37 is erected at the base of the cam body 33. The stay 37 has a return spring 38 interposed between the stay 37 and the mounting plate 26c of the control box 26, and can come into contact with a stopper 54 provided on the right plate member 26a. The unload lever 31 is biased in the push-down direction (counterclockwise in FIGS. 9 to 11) by the return spring 38.

A rotation detection means 55 including a limit switch is provided on the upper portion of the bearing plate 26d fixed to the right plate member 26a. A switch piece of the rotation detection means 55 is engaged with the stay 37.
The rotation detecting means 55 is connected to the electronic control unit of the left and right control devices 22 and 23, and operates an unload valve provided in the hydraulic circuit of the left and right control devices 22 and 23 when turned off. is there.
That is, when the unload lever 31 is pulled up and the guide pin 35 moves relatively in the first cam groove 34A of the cam body 33 from the proximal end to the distal end side (second cam groove 34B side), the stay 37 As the switch moves, the switch piece of the rotation detecting means 55 projects to detect that the unload lever 31 is lifted (unloaded state), and the left / right steering attachments 22 and 23 operate the swiveling arm, boom and bucket. Disable.

Further, a gas damper 39 for assisting the upper turning of the left steering device 22 is provided between the support portion 25B of the support bracket 25 and the control box 26 via pins 39a and 39b, and the cushion and the abutting portion. A use position contact means 41 and an avoidance position contact means 42 are provided.
Further, on the surface of the support bracket 25 on the driver's seat 8 side, first and second guide members 43A and 43B for guiding a hose connected to the left control valve 28 are provided. The first and second guide members 43A and 43B protrude toward the driver's seat 8 from the mounting portion 25A of the support bracket 25, but the lateral width of the cushioning tool 8B is formed narrower than the seat surface of the seat 8A. It does not become an obstacle to bring the left steering device 22 close to the seat 8A.

The horizontal shaft 27, the cam body 33, the unload lever 31, the return spring 38, the rotation detection means 55, the use position contact means 41, the avoidance position contact means 42, and the like constitute a rotation mechanism 29.
In the left steering device 22 configured as described above, the state shown in FIGS. 8 to 10 is a use position (normal work position) for performing work on the backhoe 1. The steering box 26 is restricted from rotating downward about the horizontal axis 27, and the left steering device 22 is held at the use position.

In the use position, the guide pin 35 is located at the base end of the first cam groove 34A, and the unload lever 31 is restricted by the stopper 54 from rotating counterclockwise in FIGS. 35 regulates the rotation of the control box 26 (left control device 22) about the horizontal axis 27 (particularly upward rotation).
Further, when the unload lever 31 is not operated at the use position, the unload lever 31 is in the unload release position, and the rotation detecting means 55 does not detect the upward rotation. , By turning the left operation lever 30 for turning / arming, the turning of the turntable 6 and the raising / lowering of the arm 15 can be operated, and the operation by the right steering device 23 for the boom / bucket can be operated. It is said.

When the cam body 33 rotates the unload lever 31 in the clockwise direction of FIGS. 8 to 10 from the use position, and the guide pin 35 is relatively positioned at the intersection of the first cam groove 34A and the second cam groove 34B. Since the guide pin 35 engages with the second cam groove 34B of the circular arc groove centered on the axis of the horizontal shaft 27, the control box 26 is allowed to rotate upward around the horizontal shaft 27, The rotation detection means 55 is turned off and the unloading state by the unload lever 31 is detected.
When the unloading lever 31 is further unrotated and further rotated upward together with the control box 26, the left control unit 22 is moved upwardly as shown in FIG. 11, and retracts upward so as to widen the entrance 20a. .

In this upward rotation state, even if the left operation lever 30 for the turn / arm is operated, the turntable 6 and the arm 15 are disabled, and the right control device 23 for the boom / bucket is operated. However, the boom 14 and the bucket 16 are disabled.
When the unload lever 31 is pulled up from the use position to the unloaded state, the steering box 26 is helped to turn upward around the horizontal axis 27 until the gas damper 39 reaches the maximum extended state. Then, it is held at the avoidance position by the avoidance position contact means 42.
1 to 3, 5 to 7, and 15 to 17, the right steering device 23 is provided with a steering valve (first valve) 46 and a work tool operating valve (second valve) 47 in the steering bracket 45. The right control valve 46 can be operated by a right operation lever 48, and the work tool operation valve 47 can be operated by a work operation lever 49.

The steering bracket 45 has a vertical wall 45A and a lower mounting portion 45B. The mounting portion 45B is mounted on the right steering device mounting portion 21c on the upper surface of the control table 21 from above and is bolted.
The vertical wall 45 </ b> A, which is in a standing posture on the cockpit 21, projects a plurality of protrusions 45 a to 45 d from the upper part to one side, that is, to the driver's seat 8 side. A first attachment portion 50 for attaching the right steering valve 46 is formed by the upper surface of the vertical wall 45A and the protrusions 45a and 45b, and a second attachment portion 51 for attaching the work tool operation valve 47 by the protrusions 45c and 45d. Is forming.

In the steering bracket 45, the mounting portion 45B, the vertical wall 45A, and the plurality of projecting portions 45a to 45d are integrally formed by die casting, and the projecting portion 45b and the projecting portion 45c are different in level, but are integrated. Protruding. On the surface of the vertical wall 45A on the driver's seat 8 side, a number of reinforcing rib protrusions 50e are formed to protrude vertically and horizontally below the protrusions 45a to 45d.
The right steering valve 46 is a pilot valve for a boom / bucket, and a control valve for the boom cylinder 17 and the bucket cylinder 19 can be controlled by a right operation lever 48, and a work tool operation valve 47 is used for the dozer device 5. It is a pilot valve, and a control valve for the dozer cylinder can be controlled by the work operation lever 49.

The steering bracket 45 is reinforced by providing rib protrusions 50e, so that the strength is ensured even in a cantilever structure with only the vertical wall 45A, even if it is formed in a sheet metal by die casting. Since there is no occurrence of such burrs and burrs, damage to the hose connected to the valve can be reduced, and the rib protrusion 50e itself serves as a hose guide.
The first mounting portion 50 of the right steering valve 46 has a mounting opening 50a in the front portion on the driver's seat 8 side, and the right steering valve 46 can be inserted and removed from the front on the driver's seat 8 side. The second mounting portion 51 of the valve 47 has a mounting opening 51a on the side portion on the driver's seat 8 side, and the work tool operating valve 47 can be inserted and removed from the side on the driver seat 8 side.

That is, the right control valve 46 and the work tool operation valve 47 can be attached to and detached from the control bracket 45 not from the vertical direction but from the left and right sides, respectively, with the hose connected.
Assembly, replacement, maintenance and the like of the right control valve 46 and the work tool operation valve 47 can be performed with the control bracket 45 and the driver's seat 8 attached to the control table 21.
With the right steering device 23 arranged as described above, the vertical wall 45A is positioned in the vicinity of the right leg portion 21R, and a work operation lever 49 is arranged on the right outside thereof, substantially above the right leg portion 21R. They are arranged close to the right side wall of the cabin 20.

When a lops device or a canopy device is mounted on the backhoe 1 instead of the cabin 20, the right steering device 23 is provided with a turning mechanism and can be turned upward by an unloading lever, like the left steering device 22. Also good.
In the present invention, the shape of each member and the positional relationship between the front, back, left, and right in the above embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.

For example, the backhoe 1 has a tank room such as a hydraulic oil tank T arranged on the right side of the fuselage 6, but a tank room is arranged on the left side of the fuselage 6, the arrangement of the hydraulic oil tank T and the driver's seat 8, and left and right steering. The arrangement of the devices 22 and 23 may be reversed left and right.
The work operation lever 49 is arranged on the right side of the vertical wall 45A of the control bracket 45. However, it may be arranged on the left side like the work tool operation valve 47. It is also possible to dispose the control unit 21 at the outermost end of the mounting part 21c, that is, directly above the right leg part 21R.

It is a front view which shows embodiment of this invention. It is the same top view. It is a perspective view of the principal part. It is the left side view. It is the same right view. It is a front view of a cockpit. It is a top view of a cockpit. It is a right view of a left steering device. It is a left view which shows the internal structure of a left steering device. It is an expansion left view which shows the internal structure of a left steering device. It is a left view which shows the state which the left steering device rotated upwards. It is a top view which shows the internal structure of a left steering device. It is a front view which shows the internal structure of a left steering device. It is a perspective view of a rotation mechanism. It is a perspective view of a right steering device. It is a right view which shows the steering bracket of a right steering apparatus. It is a perspective view of the same steering bracket. It is a whole perspective view of a control part. It is a whole top view of a turning work machine. It is a whole side view of a turning work machine.

Explanation of symbols

1 Backhoe (work machine)
2 swivel body 3 traveling device 5 dozer device 6 swivel base (airframe)
7 Excavator 8 Driver's Seat 20 Cabin 21 Control Board 22 Left Steering Device 23 Right Steering Device 45 Steering Bracket 45A Vertical Wall 45B Mounting Portion 45a to 45d Protrusion 46 Main Steering Valve (First Valve)
47 Work tool operation valve (second valve)
48 Right operation lever 49 Work operation lever 50 First mounting portion 51 Second mounting portion

Claims (3)

The control table (21) is fixed on the fuselage (6), the driver's seat (8) is arranged on the control table (21), and the control device (23) is arranged on one side of the driver's seat (8). The steering device (23) is provided with a first valve (46) and a second valve (47) on the steering bracket (45),
The control bracket (45) projects a plurality of protrusions (45a to 45d) laterally from a vertical wall (45A) standing on the control table (21), and the plurality of protrusions (45a to 45d). And a mounting portion (50, 51) for attaching the first valve (46) and the second valve (47) from the left and right sides.   The control bracket (45) has a plurality of protrusions (45a to 45d) projecting from the vertical wall (45A) toward the driver's seat (8) by integral molding, and the first valve (46) mounting portion ( 50) has a mounting opening (50a) at the front portion on the driver's seat (8) side, and the mounting portion (51) of the second valve (47) is mounted on the side portion on the driver's seat (8) side. The operating unit structure for a working machine according to claim 1, wherein   The operating unit structure for a working machine according to claim 1 or 2, wherein the operating device (23) is attached to the upper surface of the operating table (21) from above.

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