JPH09105148A - Work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible for a single machine to execute two types of work and execute work while monitoring two working machines, slewing around a driver seat. SOLUTION: A first working machine A and a second working machine B are mounted on the upper part of a chassis 12, thereby enabling two types of work to be executed. A driver seat 40 provided with a seat 44 and an operating member is turnably mounted, thereby forming the seat 44 in one posture directed at the first working machine A and the other posture directed at the second working machine B, allowing a worker to execute work, while monitoring two working machines.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine used for road construction, structure dismantling construction, construction foundation construction and the like.

[0002]

2. Description of the Related Art As a working machine used for road construction, structure dismantling construction, and foundation construction work of construction, an upper body is rotatably attached to a lower body equipped with a traveling body, and a boom is vertically moved on the upper body. BACKGROUND ART There are known small hydraulic excavators, medium-sized and large hydraulic excavators in which a boom is swingably mounted, an arm is swingably coupled to the boom, and a bucket is vertically swingably mounted on the arm.

[0003]

Although such a hydraulic excavator is used for bucket work such as excavation and loading,
In the above-mentioned construction, other work such as breaker work, crusher work and nibler work is often performed at the same time as the shovel work.

Conventionally, in such a case, instead of the bucket at the end of the arm, another hydraulic excavator equipped with a breaker, a crusher, a nibler or the like as an attachment and two hydraulic excavators are simultaneously put in, or after the excavator work is completed. Whether to replace the bucket with another attachment and do other work.

In the case of small-scale construction or construction in a narrow spilled area, the former are obstructed by the hydraulic excavators, and must be used with a low operating rate. In the latter case, one work must be completed and another work must be performed, and the work becomes a series, and in the case of shredded work in which bucket work and other work are repeated alternately, attachment replacement is very troublesome and time loss. Is large.

In order to solve this problem, the applicant first mounted the first working machine on the front portion of the upper vehicle body so as to be vertically swingable, and vertically swinging the second working machine on the rear portion of the upper vehicle body. I applied for a work machine that was freely installed.

[0007]

With such a work machine, one work machine can perform two types of work. However, since the work machines are attached to the front and rear parts of the upper car body so that they can be swung up and down, the operator operates the front facing or the rear facing, which is very troublesome and the safety of the surroundings. It will be difficult to confirm.

Therefore, an object of the present invention is to provide a working machine capable of solving the above-mentioned problems.

[0009]

According to a first aspect of the present invention, an upper vehicle body 12 is rotatably attached to a lower vehicle body 11 equipped with a traveling body 10, and the upper vehicle body 12 is at a position substantially opposite to a center of turning. First with different working tools
The working machine A and the second working machine B are respectively mounted so as to be vertically swingable, and a seat 44 and a control member are mounted on the floor 43 to form a driver's seat 40. The floor 43 of the driver's seat 40 is attached to the upper vehicle body 12, The seat 44 is rotatably attached to the upper body 12 and the floor 43 in a first posture in which the seat 44 substantially faces the first working machine A and in a second posture in which the seat 44 substantially faces the second working machine A. The working machine is characterized in that a turning mechanism 46 is provided across the working machine.

According to the first invention, the first working machine A and the second working machine A
Since different work can be performed depending on the work machine B, one work machine can perform two types of work. Further, if the driver's seat 40 is turned to the first posture, the operator sitting on the seat 44 can see the first work implement A in a comfortable posture, and if the driver's seat 40 is turned to the second posture, the operator can sit on the seat 44. The operator sitting at can see the second work implement B in a comfortable posture. Therefore, since it is possible to work while looking at the first working machine A and the second working machine B in a comfortable posture, the operation is very easy and the safety of the surroundings can be easily confirmed.

A second invention is a working machine in which the first working machine A and the second working machine B of the first invention are attached to the upper vehicle body 12 in a left-right swing type or an offset type.

According to the second aspect of the invention, when the working machine is rocked to the left or right or offset by excavating a gutter or the like, the work can be facilitated by turning the seat 44.

In a third aspect of the present invention, the turning center of the driver's seat 40 in the first and second aspects of the invention is set at the mounting portion of the first working machine A and the second portion.
It is a working machine that is offset with respect to a straight line connecting the mounting portions of the working machine B.

According to the third aspect of the invention, since the operator sitting on the seat 44 looks at the first working machine A and the second working machine B at an angle, the seat 44 is correctly oriented.
The first working machine A and the second working machine B can be seen without pointing at the second working machine B. Therefore, the turning angle of the driver's seat 40 can be made smaller than 180 degrees, and the driver's seat 40 can be turned by the cylinder.

In a fourth aspect of the present invention, a tubular body 58 is rotatably attached to the upper vehicle body 12 in the first, second and third aspects so as to be rotatable about a vertical axis, and the floor 43 of the driver's seat 40 is attached to the tubular body 58. Is attached, and a turning cylinder 61 is connected across the tubular body 58 and the upper vehicle body 12 to form a turning mechanism 46 of the driver's seat 40.

According to the fourth aspect of the invention, the swiveling cylinder 61 is provided.
Since the driver's seat 40 can be turned by expanding and contracting, the structure is simplified.

A fifth aspect of the present invention includes a fixed ring 110 fixed to the upper vehicle body 12 of the first, second and third aspects, and a movable ring 111 rotatably supported by the fixed ring 110 and fixed to the floor 43. The working machine is a turning mechanism 46 that is mounted on the upper vehicle body 12 and uses a turning motor 113 that rotates a movable ring 111.

According to the fifth invention, the driver's seat 40 is set to 360
Since the seat 44 can be turned, the seat 44 can be properly oriented toward the first working machine A and the second working machine B.

A sixth aspect of the present invention is the first, second, third, fourth,
The push-pull cable 71 and the hydraulic hose 80 arranged between the lower part of the floor 43 of the driver's seat 40 and the upper part of the upper vehicle body 12 in the fifth aspect of the invention are curved in an arc shape around the turning mechanism 46. It is a working machine that is installed.

According to the sixth invention, the push cable 7
1. The hydraulic hose 80 can be compactly housed and arranged in the lower part of the floor 43, and when the driver's seat 40 turns, the hydraulic hose 80 is displaced so as to be caught around the turning mechanism 46, and the push-pull cable 71 and the hydraulic hose 80 are moved. No damage.

A seventh aspect of the invention is to provide two circuits for supplying the pressure oil discharged from the hydraulic pump 90 of the fourth, fifth and sixth aspects to the swing cylinder 61 or the swing motor 113.
It is a working machine provided with means for short-circuiting the two circuits to communicate with the tank.

According to the seventh aspect of the invention, the communication means is used to
When the two circuits are short-circuited to communicate with the tank, the turning cylinder 61 or the turning motor 113 is operated by an external force. Therefore, the driver's seat 40 can be manually turned when the hydraulic pump 90 is in a state of not discharging the pressure oil.

An eighth aspect of the invention is to rotate two circuits for supplying the pressure oil discharged from the hydraulic pump 90 of the fourth, fifth, sixth and seventh inventions to the orbiting cylinder 61 or the orbiting motor 113. The working machine is provided with a double pilot check valve 98 for preventing backflow of pressure oil from the working cylinder 61 or the turning motor 113.

According to the eighth invention, the swiveling cylinder 61.
Alternatively, the turning motor 113 can be reliably prevented from operating by an external force, and the driver's seat 40 does not turn under its own weight even if the working machine is left on a sloping ground for a long time.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, a lower vehicle body 11 provided with a traveling body 10 and an upper vehicle body 12 have a turning mechanism a.
The first bracket 13 and the second bracket 14 are integrally provided so as to face each other, for example, at a front portion and a rear portion, which are opposed to each other with the turning center 12a of the upper vehicle body 12 as a boundary. .

A mounting body 16 is mounted on the first bracket 13 so as to be swingable about a vertical axis. A swinging link 17 provided on the mounting body 16 and a swinging cylinder 18 are connected to the upper vehicle body 12. There is a boom 1 on the mounting body 16.
9 is mounted on the boom cylinder 20 so as to be vertically swingable,
An arm 21 is attached to the boom 19 by an arm cylinder 22 so as to be vertically swingable, and a bucket 23, which is a work tool, is attached to the arm 21 by a work tool cylinder 24, so that the bucket 23 is vertically swingable. 1 Working machine A is configured. The first working machine A is of a left-right swing type, but may be of a left-right offset type.

A mounting body 25 is mounted on the second bracket 14 so as to be swingable about a vertical axis, and a swinging link 26 provided on the mounting body 25 and a swinging cylinder 27 are connected across the upper vehicle body 12. A first boom 28 is vertically swingably attached to the attachment body 25 by a first boom cylinder 29, and a second boom 30 is vertically swingable by a second boom cylinder 31 on the first boom 28. An arm 32 is attached to the second boom 30 by an arm cylinder 33 so as to be vertically swingable, and a mixing agitator 34 as a work tool is attached to the arm 32 by a work tool cylinder 35 so as to be vertically rotatable. And constitutes a swing-type second working machine B.
The second work machine B is of a left-right swing type, but may be of a left-right offset type.

The mixing / stirring machine 34 comprises a rotor cover 36 and a rotor 37 for mixing / stirring rotatably mounted thereon.
An arm 32 and a link 39 are connected to a bracket 38 fixed to the rotor cover 36 so that when the piston rod 35a of the work implement cylinder 35 expands and contracts, the rotor cover 36 rotates up and down.

A driver's seat 40 and a main driving device 41 are attached to the opposite positions orthogonal to the first and second brackets 13 and 14 with the turning center 12a of the upper body 12 as a boundary, for example, the left side and the right side. is there. The main drive device 41 is covered with a cover body 42. The cab 40 is on the floor 43
The seat 44 and operation members such as the operation lever 45 are attached to the. The floor 43 is attached to the upper vehicle body 12 so as to be turnable by a turning mechanism 46.

The driver's seat 40 and the main driving device 41 are separated from each other in the left-right direction, and the driver's seat 40 on the upper surface of the upper vehicle body 12 is separated.
A space C is formed between the main drive device 41 and the main drive device 41.
This space portion C is located at the turning center 12a of the upper vehicle body 12 and is continuous from the front portion to the rear portion of the upper vehicle body 12, and the width b of the space portion C is the lower portion of the first working machine A (boom 19).
Also, the width is slightly wider than the width of the lower part (first boom 28) of the second work machine B.

A hydraulic oil tank 47 is attached to the left side portion of the upper body 12, that is, to the rear portion of the floor 43. The hydraulic oil tank 47 is designed so as not to interfere when the floor 43 turns. A fuel tank 48 is attached near the cover body 42 in the space C. The fuel tank 48 does not interfere with the boom 19 of the first working machine A.

Since this is the case, the first working machine B of the first working machine B
・ Mixing agitator 3 by swinging the second booms 28, 30 upward
4 is above the ground, the floor 43 is in the forward posture of FIG. 1, and the boom 19 and the arm 21 of the first working machine A are rocked up and down, and the bucket 23 is rocked up and down. Perform bucket work. At this time, since the operator sitting on the seat 44 faces substantially forward, the operator can easily operate while watching the first working machine A.

The boom 19 of the first working machine A is swung upward to bring the bucket 23 to a position above the ground, and the floor 43 is placed in a substantially rearward posture as shown by a phantom line in FIG. The first and second booms 28, 30 and the arm 32 are swung downward to perform the mixing and stirring operation by the mixing and stirring machine 34. At this time, since the operator sitting on the seat 44 faces almost rearward, the operator can easily operate it while looking at the second working machine B.

At this time, since the second working machine B has the first and second booms 28 and 30 and the arm 32, the first and second booms 28 and 30 and the arm 32 are placed in a substantially horizontal state to perform mixing and stirring. The machine 34 can be moved farther than the upper vehicle body 12 and the working range is widened.

As described above, since the bucket work and the mixing and agitation work can be performed by one working machine, road construction and foundation construction of the construction can be efficiently performed.

Further, since the first working machine A and the second working machine B are positioned substantially opposite to each other with the turning center 12a of the upper vehicle body 12 as a boundary, the working machines are working with one working machine. The other working machine serves as a counterweight and can improve the stability of the vehicle body.

Moreover, when one working machine is working, the other working machine is extended to play the role of the variable position counterweight and the stability of the vehicle body can be improved. The range can be expanded.

Further, the first and second working machines A and B are attached to the front and rear portions of the upper body 12 with the turning center 12a as a boundary, whereby the vehicle stability in the front-rear direction is improved, and the upper body 12 is also provided. Since the driver's seat 40 and the main driving device 41 are attached to the left and right sides of the turning center 12a of the vehicle, the vehicle stability in the left-right direction is improved, and the vehicle stability is excellent. The second working machines A and B are separated from the driver's seat 40 in the left-right direction, and the visibility of the operator of the seat 44 is good.

Further, the turning center of the driver's seat 40 is displaced leftward with respect to the straight line connecting the mounting portion of the first working machine A and the mounting portion of the second working machine B, and the seat 44 is aligned with the straight line. On the other hand, since it is shifted to the left side, the operator sitting on the seat 44 can see the first working machine A and the second working machine B in a comfortable posture without rotating the floor 43 by 180 degrees. As a result, the turning angle of the driver's seat 40 can be made smaller than 180 degrees.

Further, since the hydraulic oil tank 47 is mounted near the rear portion of the left side portion of the upper vehicle body 12, the vehicle stability in the left-right direction is further improved.

By swinging the first working machine A and the second working machine B upward, the lower part of the first working machine and the lower part of the second working machine are housed in the space C. . As a result, the first working machine A and the second working machine B are less likely to project from the upper vehicle body 12, and even if the upper swing body 12 is swung in a narrow place, the first and second working machines A and B are obstructed. The minimum turning radius can be reduced without interfering with objects.

As shown in FIG. 2, the outer surface of the upper vehicle body 12 is substantially arcuate about the turning center 12a and is located within the width between the pair of traveling bodies 10. The first bracket 13 and the second bracket 14 are located within the maximum turning locus c on the outer surface of the upper vehicle body 12. Although the mounting body 16 and the mounting body 25 slightly project from the maximum turning radius c,
It is positioned within the maximum turning radius c by being rocked by the rocking cylinders 18, 27.

Since this is the case, the upper vehicle body 12 can be turned within the width of the pair of traveling bodies 10 while the mounting bodies 16 and 25 are swung, so that a very small turn can be made and the mounting body 1
When not swinging 6, 25, the operator mounts the mounting body 1
It suffices to turn while taking care not to interfere with the obstacles 6 and 25, and it is not necessary to pay attention to the turning operation.

Next, the structure for turning the driver's seat 40 will be described.

As shown in FIGS. 3 and 4, the upper vehicle body 12 is formed by fixing a left side frame 51 and a right side frame (not shown) to an intermediate frame 50, and swinging the lower surface of the intermediate frame 50. A fixed ring 52 constituting the mechanism a is fixed, and a movable ring 54 is rotatably supported by the fixed ring 52 via a bearing 53. The movable ring 54 is attached to the lower vehicle body 11 and the intermediate frame 50 A pinion rotated by a motor attached to is fitted to the inner teeth 54a of the movable ring 54, and the upper body 12 turns with respect to the lower body 11 by driving the motor.

A fixed ring 55 is fixed to the upper surface 51a of the left side frame 51, and a movable ring 57 is rotatably supported by the fixed ring 55 via a bearing 56. The lower portion of the tubular body 58 is fixed to the movable ring 57, and the upper portion of the tubular body 58 is fixed to the floor 43. A turning cylinder 61 is connected across a bracket 59 of the tubular body 58 and a bracket 60 attached to the upper surface 50a of the intermediate frame 50.

As a result, by expanding and contracting the swiveling cylinder 61, the floor 43 is swung together with the tubular body 58, and thus the swivel mechanism 46 is constituted.

A switch panel 62 is attached to the left side of the seat 43 on the floor 43, and an operation panel 63 is attached to the right side.

The hydraulic oil tank 57 is the left side frame 5
1, the mounting portion 62 below the upper surface 51a near the rear portion
It is attached with a bolt 63. As a result, the height from the upper surface 51a of the left side frame 51 to the upper surface of the hydraulic oil tank 47 becomes lower than the total height of the hydraulic oil tank 47.

The backrest portion 44a of the seat 44 and the upper portion of the operation panel 63 are higher in hydraulic oil tank 47 than in the floor 43.
It projects to the side so as not to interfere with the hydraulic oil tank 47. As a result, the hydraulic oil tank 47, the backrest portion 44a of the seat 44, and the upper portion of the operation panel 63 overlap each other in the front-rear direction without reducing the total height of the hydraulic oil tank 47. The space for mounting the seat 40 and the hydraulic oil tank 47 in the front-rear direction can be reduced.

As described above, the turning cylinder 61
If the operator is in the retracted state, the driver's seat 40 is in the forward-facing posture shown in FIG.
You can operate it while looking at it in a comfortable position.

Further, when the turning cylinder 61 is extended, the driver's seat 40 turns by about 120 degrees into a substantially rearward posture as shown in FIG. 5, and the operator sitting on the seat 44 looks at the second work implement B in a comfortable posture. You can operate it while

One end surface 4 of the floor 43 on the seat 44 side
The corner portion closer to the center of the turning center 46a in 3a is not a right angle but a slant. The distance from the end surface 64 of the oblique corner to the turning center 46a is made slightly shorter than the distance from the turning center 46a to the one end surface 43a.

Because of this, even if the gap between the one end surface 43a of the floor 43 and the hydraulic oil tank 57 is reduced, the hydraulic oil tank 57 and the floor 4 are rotated when the floor 43 is swung.
3 does not interfere.

The operating lever 45 is, as shown in FIG.
The hydraulic pilot valve 70 is operated, and an operation valve (not shown) is switched and operated by a push-pull cable 71. An electric cable 72 is connected to a controller provided on the operation panel 62.

As shown in FIG. 6, the electric cable 72 is inserted through the hollow portions of the tubular body 58, the movable ring 57 and the fixed ring 55 to be connected to an electric control device. In this way, the electric cable 72 will not be twisted when the floor 43 is turned.

As shown in FIGS. 6 and 7, the push-pull cable 71 is arranged so as to be curved in an arc shape along the outer periphery of the cylindrical body 58, and one end portion 71a thereof is provided with a lever 73, a rod 74, and
It is linked to the operation lever 45 via the lever 75 and the like. The other end portion 71b of the push-pull cable 71 is linked to an operation valve or the like (not shown).

Specifically, the middle portion of the push-pull cable 71 is fixed to the upper vehicle body side by the first clamp jig 75, and is made to make about one turn around the tubular body 58 from the fixed portion, and that portion is fixed. It is fixed to the floor 43 by the second clamp jig 76, and the end portion 71a is connected to the arm swung by the lever 73 by making the portion near the one end from the fixed portion into an arc shape.

In this way, the push-pull cable 71 is compactly arranged under the floor 43, and the floor 43 is rotated clockwise from the forward-facing posture shown in FIG.
When the push-pull cable 71 is turned by 20 degrees, the push-pull cable 71 is displaced so as to be wound around the tubular body 58, so that the push-pull cable 71 is not damaged.

A plurality of hydraulic hoses 80 are connected to the hydraulic pilot valve 70. These hydraulic hoses 80 are collectively fixed to the floor 43 by a first hose clamp jig 81, and the fixed portion and the subsequent parts thereof are made to make a half turn around the tubular body 58, and the second hose clamp jig 82 is used for the left side. It is fixed to the partial frame 51. The hydraulic hoses 80 between the first hose clamp jig 81 and the second hose clamp jig 82 are collectively inserted in a thick hose 83.

Because of this, the hydraulic hose 80 is compactly arranged under the floor 43, and
Since the hydraulic hose 80 is displaced so as to be wound around the tubular body 58 when it is turned to the right by approximately 120 degrees from the forward facing posture shown in FIG. 7, the hydraulic hose 80 is not damaged.

Since the push-pull cable 71 and the hydraulic hose 80 are vertically overlapped with each other, a partition plate 84 is provided as shown in FIG. This prevents the push-pull cable 71 and the hydraulic hose 80 from rubbing against each other and being damaged.

Next, a hydraulic circuit for supplying pressure oil to the turning cylinder 61 will be described. As shown in FIG. 8, the hydraulic pump 9
In the discharge passage 91 of 0, a turning valve 92 and another hydraulic actuator valve 93 are provided. Swing valve 92
Is the first position B when the pilot pressure is supplied from the hydraulic pilot valve 94 to the first pressure receiving unit 92a, is the second position B when being supplied to the second pressure receiving unit 92b, and is the neutral position C otherwise. .

The turning valve 92 and the turning cylinder 61 are connected via a communication valve 95, and when the turning valve 92 is set to the communication position D and the turning valve 92 is set to the first position B, pressure oil is supplied to the compression chamber 61a. When the second position B is set, the extension chamber 6
When pressure oil is supplied to 1b and the neutral position C is set, the compression chamber 61
a, the expansion chamber 61b is closed.

Therefore, by setting the turning valve 92 from the neutral position C to the first position A and the second position B, the turning cylinder 61 expands and contracts and the driver's seat 40 can turn by its own weight. it can.

When the communication valve 95 is set to the short-circuit position E and the stop valve 96 is opened to communicate with the tank 97, the compression chamber 61a and the expansion chamber 61b communicate with the tank 97, and the swiveling cylinder 61 expands and contracts by an external force. . As a result, the driver's seat 40 can be manually turned in the event of engine failure, stop, or hydraulic pump 90 failure.

With the above hydraulic circuit, the turning valve 9
When 2 is set to the neutral position c, the pressure oil in the compression chamber 61a and the expansion chamber 61b of the turning cylinder 61 may leak from the turning valve 92 to the tank, and if the working machine is left on the sloping ground for a long time, the driver's seat 40 May rotate under its own weight, so as shown in FIG.
Is provided. In this way, it is possible to reliably prevent the pressure oil from flowing from the turning cylinder 61 to the turning valve 92, so that the driver's seat 40 does not turn under its own weight even if the working machine is left on the slope for a long period of time.

FIG. 10 shows a third embodiment of the hydraulic circuit, in which the first and second pilot circuits 99 and 100 connected to the output side of the hydraulic pilot valve 94 are connected to the communication valve 95 to output the hydraulic pilot valve 94. The turning cylinder 61 is extended and contracted by the pressure oil.

In this way, the swiveling valve is not needed, and the cost can be reduced.

In this case, the double pilot check valve 98 is provided in the first and second pilot circuits 99 and 100, and when the hydraulic pilot valve 94 is not operated, the pressure oil flows from the turning cylinder 61 to the hydraulic pilot valve 94. To prevent the driver's seat 40 from turning due to its own weight on a sloping ground.

Next, a second embodiment of the turning mechanism 46 will be described. As shown in FIGS. 11 and 12, the fixed ring 110 is fixed to the upper vehicle body 12 (the left side frame 51, the movable ring 111 is rotatably supported by the fixed ring 110 by the bearing 112, and the movable ring 111 is fixed to the floor. It is fixed to the lower surface of 43. The pinion 115 is rotated by the turning motor 113 attached to the left side frame 51 via the speed reducer 114, and the pinion 115 is rotated to the inner teeth 11 of the movable ring 111.
Fit to 6.

With this arrangement, the floor motor 43 can be turned 360 degrees by driving the turning motor 113, and the seat 44 can be placed in the forward posture and the backward posture.

In this case, the swivel joint 117 is attached to the center of rotation. This swivel joint 117
Can transmit pressure oil and electricity between the fixed portion 118 and the rotating portion 119. The fixed portion 118 is attached to the left side frame 51 and the rotating portion 119 is fixed to the floor 43. In this way, the floor 43 and the left side frame 5
It is possible to transmit pressure oil and electricity to and from 1.

FIG. 13 is a hydraulic circuit diagram of the turning motor 113, which is similar to the turning cylinder 61. In this case, the turning valve 92 is set to the first position B and the second position B, so that the first port 113 of the turning motor 113 is moved.
a, the pressure oil is supplied to the second port 113b to rotate normally and reversely.

[Brief description of the drawings]

FIG. 1 is an overall front view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a detailed front view of a driver seat mounting portion.

FIG. 4 is a detailed plan view of a driver seat mounting portion.

FIG. 5 is a plan view showing a turning state of a driver's seat.

FIG. 6 is a front view showing the connection of a push-pull cable and a hydraulic hose to the driver's seat.

FIG. 7 is a plan view showing a connection of a push-pull cable and a hydraulic hose to a driver's seat.

FIG. 8 is a hydraulic circuit diagram of a turning cylinder.

FIG. 9 is a hydraulic circuit diagram of a turning cylinder.

FIG. 10 is a hydraulic circuit diagram of a turning cylinder.

FIG. 11 is a front view showing a second embodiment of the turning mechanism.

FIG. 12 is a plan view showing a second embodiment of the turning mechanism.

FIG. 13 is a hydraulic circuit diagram of a turning motor.

[Explanation of symbols]

 A ... 1st working machine B ... 2nd working machine 10 ... Running body 11 ... Lower body 12 ... Upper body 40 ... Driver's seat 43 ... Floor 44 ... Seat 45 ... Operation lever 46 ... Slewing mechanism 47 ... Hydraulic oil tank 50 ... Intermediate Part claim 51 ... Left side frame 58 ... Cylindrical body 61 ... Revolving cylinder 71 ... Push-pull cable 80 ... Hydraulic hose 90 ... Hydraulic pump 92 ... Revolving valve 94 ... Hydraulic pilot valve 95 ... Communication valve 96 ... Stop valve 97 ... Tank 98 ... Double pilot check valve 110 ... Fixed ring 111 ... Movable ring 113 ... Swivel pump 117 ... Swivel joint

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Suzuki 1-3 Takaracho, Kashiwazaki-shi, Niigata Komatsu Est Co., Ltd. Headquarters factory (72) Takashi Otsu 1-3 Takaracho, Kashiwazaki-shi, Niigata Komatsu Est Co., Ltd. (72) Inventor Eiji Yamazaki 1-3 Takaracho, Kashiwazaki City, Niigata Prefecture Komatsu Est Co., Ltd.

Claims (8)

[Claims] 1. A first working machine A having an upper body 12 rotatably attached to a lower body 11 equipped with a traveling body 10 and provided with different working tools at positions substantially opposite to the center of turning of the upper body 12. And the second working machine B are mounted so as to be swingable up and down, respectively, and a seat 44 and a control member are mounted on the floor 43 and the driver's seat 4
0, the floor 43 of the driver's seat 40 is attached to the upper vehicle body 12,
A first posture in which the seat 44 almost faces the first work implement A,
A working machine characterized in that a seat 44 is mounted so as to be swivelable in a second posture substantially facing the second working machine A, and a turning mechanism 46 is provided between the upper vehicle body 12 and the floor 43. 2. The work machine according to claim 1, wherein the first work machine A and the second work machine B are attached to the upper vehicle body 12 in a left-right swing type or an offset type. 3. The working machine according to claim 1, wherein the turning center of the driver's seat 40 is offset with respect to a straight line connecting the mounting portion of the first working machine A and the mounting portion of the second working machine B. 4. A tubular body 58 is rotatably attached to the upper vehicle body 12 about a vertical axis, and a floor 43 of a driver's seat 40 is attached to the tubular body 58, and the tubular body 58 and the upper vehicle body 12 are extended. The work machine according to claim 1, 2 or 3, wherein the turning cylinder 61 is connected to form a turning mechanism 46 of the driver's seat 40. 5. A fixing ring 11 fixed to the vehicle body 12.
0, a movable ring 111 rotatably supported by the fixed ring 110 and fixed to the floor 43, and a turning motor 113 attached to the upper vehicle body 12 to rotate the movable ring 111 to form the turning mechanism 46. 2 or 3
The work machine described. 6. A push-pull cable 71 and a hydraulic hose 80 arranged between the lower portion of the floor 43 of the driver's seat 40 and the upper portion of the upper vehicle body 12 are curved in an arc shape around the turning mechanism 46. The working machine according to claim 1, 2 or 3 or 4 or 5, wherein 7. The two circuits for supplying the pressure oil discharged from the hydraulic pump 90 to the orbiting cylinder 61 or the orbiting motor 113 is provided with means for short-circuiting the two circuits to communicate with the tank. Or the working machine according to 5 or 6. Operating device. 8. The pressure oil is prevented from flowing backward from the rotation cylinder 6 or the rotation motor 113 to the two circuits for supplying the pressure oil discharged from the hydraulic pump 90 to the rotation cylinder 61 or the rotation motor 113. The work machine according to claim 4, 5 or 6 or 7, wherein a double pilot check valve 98 is provided.