JP3654539B2 - Work machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work machine used for road construction, structure dismantling work, foundation work of a construction, and the like.
[0002]
[Prior art]
As a work machine used in road construction, structure dismantling work, and foundation work for construction, the upper car body is pivotably attached to the lower car body with the traveling body, and the boom is attached to the upper car body so that it can swing up and down. A small hydraulic excavator, a medium-sized hydraulic excavator, and a large hydraulic excavator in which an arm is connected to the boom so as to be swingable up and down, and a bucket is rotatably mounted on the arm are known.
[0003]
[Problems to be solved by the invention]
Such a hydraulic excavator performs bucket work such as excavation and loading. In the above-described construction, other work such as breaker work, crusher work, and nibler work is often performed simultaneously with the excavator work.
[0004]
Conventionally, in such a case, instead of the bucket at the end of the arm, two other hydraulic excavators and hydraulic excavators equipped with breakers, crushers, nibblers, etc. as the attachment are put in at the same time, or after the excavator work is finished The other thing to do was to replace the attachment.
[0005]
In the case of small-scale construction or narrow-floor construction, the former has to be used in such a way that hydraulic excavators get in the way or have a low operation rate. In the latter case, it is unavoidable to move to another work after one work is completed, and in the case of a chopping work where the bucket work and the other work are repeated alternately, the attachment replacement is very troublesome and time loss occurs. Is big.
[0006]
In order to solve this problem, the present applicant firstly attaches the first work machine to the front part of the upper vehicle body so as to be able to swing up and down, and attaches the second work machine to the rear part of the upper vehicle body so as to be able to swing up and down. Filed a working machine.
[0007]
[Problems to be solved by the invention]
With such a work machine, two types of work can be performed with one work machine.
However, since the work implements are mounted on the front and rear of the upper car body so that they can swing up and down, the operator can operate facing forward or facing backwards, which is very cumbersome and the safety of the surroundings. It will be difficult to confirm.
[0008]
Therefore, an object of the present invention is to provide a work machine that can solve the above-described problems.
[0009]
[Means for solving the problems and effects]
In the first invention, an upper vehicle body 12 is turnably attached to a lower vehicle body 11 provided with a traveling body 10, and a first work machine having different work tools at positions substantially opposed to the turning center in the upper vehicle body 12. A and the second work machine B are mounted so as to be swingable up and down,
A seat 44 and a steering member are attached to the floor 43 to form a driver seat 40.
The floor 43 of the driver's seat 40 is placed on the upper vehicle body 12 in a first posture in which the seat 44 is substantially directed to the first work machine A and a second posture in which the seat 44 is substantially directed to the second work machine A. It can be swiveled over,
A turning mechanism 46 is provided across the upper body 12 and the floor 43 ,
The work machine is characterized in that the turning center of the driver's seat 40 is offset to the left side with respect to a straight line connecting the attachment portion of the first work machine A and the attachment portion of the second work machine B.
[0010]
According to the first invention, since different work can be performed by the first work machine A and the second work machine B, two kinds of work can be performed by one work machine.
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 machine A with a comfortable posture, and if the driver's seat 40 is turned to the second posture, the seat 44 is turned. The operator sitting on the machine can see the second work machine B in an easy posture.
Therefore, since the work can be performed while looking at the first work machine A and the second work machine B in an easy posture, the operation is very easy and the surrounding safety can be easily confirmed.
Further, since the turning center of the driver's seat 40 is offset to the left side with respect to the straight line connecting the mounting portion of the first work machine A and the mounting portion of the second work machine B, the floor 43 does not rotate 180 degrees. Both operators sitting on the seat 44 can see the first work machine A and the second work machine B in an easy posture.
Therefore, the turning angle of the driver's seat 40 can be set to an angle smaller than 180 degrees.
[0015]
In the second invention , a cylindrical body 58 is attached to the upper vehicle body 12 in the first invention so as to be rotatable about the vertical axis, and the floor 43 of the driver's seat 40 is attached to the cylindrical body 58. This is a work machine in which a turning cylinder 61 is connected over the upper vehicle body 12 to form a turning mechanism 46 of the driver's seat 40.
[0016]
According to the second invention , the driver's seat 40 can be turned by extending and retracting the turning cylinder 61, so that the structure becomes simple.
[0017]
The third invention is a fixed ring 110 fixed to the upper vehicle body 12 in the first invention, a movable ring 111 rotatably supported on the fixed ring 110 and fixed to the floor 43, and attached to the upper vehicle body 12 to be movable. This is a working machine having a turning mechanism 46 by a turning motor 113 that rotates a ring 111.
[0018]
According to the third invention, the driver's seat 40 can be rotated 360 degrees, so that the seat 44 can be properly oriented toward the first work machine A and the second work machine B.
[0021]
In the fourth invention, the discharge pressure oil of the hydraulic pump 90 in the second or third invention is used for the contraction chamber 61a and the extension chamber 61b of the turning cylinder 61 or the first port 113a and the second port 113b of the turning motor 113 . Is a work machine provided with means for short-circuiting the two circuits and communicating with the tank.
[0022]
According to the fourth aspect of the invention, the two cylinders are short-circuited by the communicating means and communicated with the tank, so that the turning cylinder 61 or the turning motor 113 is operated by an external force.
Therefore, the driver's seat 40 can be turned manually by the time when the hydraulic pump 90 is in a state of not discharging pressure oil.
[0023]
According to a fifth aspect of the present invention, the discharge pressure oil of the hydraulic pump 90 in the second or third aspect is supplied to the contraction chamber 61a and the expansion chamber 61b of the turning cylinder 61 or the first port 113a and the second port 113b of the turning motor 113 . The working machine is provided with a double pilot check valve 98 for preventing the pressure oil from flowing backward from the turning cylinder 61 or the turning motor 113 in the two circuits supplied to.
[0024]
According to the fifth aspect of the present invention, it is possible to reliably prevent the turning cylinder 61 or the turning motor 113 from operating with an external force, and the driver's seat 40 can turn with its own weight even if the work machine is left on an inclined place for a long period of time. Absent.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIGS. 1 and 2, an upper vehicle body 12 is attached to a lower vehicle body 11 provided with a traveling body 10 so as to be able to turn by a turning mechanism a, and substantially opposite positions with a turning center 12 a of the upper vehicle body 12 as a boundary. For example, the first bracket 13 and the second bracket 14 are integrally provided to be opposed to each other at the front portion and the rear portion.
[0026]
An attachment body 16 is attached to the first bracket 13 so as to be swingable about a vertical axis, and a swinging link 17 provided on the mounting body 16 and a swing cylinder 18 are connected across the upper vehicle body 12. A boom 19 is attached to the mounting body 16 by a boom cylinder 20 so as to be swingable up and down, and an arm 21 is attached to the boom 19 so as to be swingable up and down by an arm cylinder 22, and a bucket as a work tool is attached to the arm 21. 23 is attached to the work tool cylinder 24 so as to be rotatable up and down, and constitutes a first work machine A that is vertically swingable. The first work machine A is a left-right swing type, but may be a left-right offset type.
[0027]
An attachment body 25 is attached to 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 swing cylinder 27 are connected across the upper vehicle body 12. A first boom 28 is attached to the mounting body 25 by a first boom cylinder 29 so as to be swingable up and down, and a second boom 30 is attached to the first boom 28 by a second boom cylinder 31 so as to be swingable up and down. An arm 32 is attached to the second boom 30 by an arm cylinder 33 so as to be swingable up and down, and a mixing stirrer 34 as a work tool is attached to the arm 32 so as to be pivotable up and down by a work tool cylinder 35 and swings. The 2nd working machine B of type | formula is comprised. The second work machine B is a left-right swing type, but may be a left-right offset type.
[0028]
The mixing stirrer 34 includes a rotor cover 36 and a rotor 37 for mixing and stirring that is rotatably mounted. An arm 32 and a link 39 are connected to a bracket 38 fixed to the rotor cover 36, and the piston of the work tool cylinder 35. When the collar 35a is expanded and contracted, the rotor cover 36 is rotated up and down.
[0029]
A driver's seat 40 and main driving equipment 41 are attached to opposite positions orthogonal to the first and second brackets 13 and 14 with respect to the turning center 12a of the upper vehicle body 12, for example, at the left side and the right side. The main drive device 41 is covered with a cover body 42.
The driver's cab 40 has a floor 43 with operating members such as a seat 44 and an operating lever 45 attached thereto. The floor 43 is attached to the upper vehicle body 12 so as to be turnable by a turning mechanism 46.
[0030]
The driver's seat 40 and the main drive device 41 are separated in the left-right direction, and a space C is formed between the driver's seat 40 and the main drive device 41 on the upper surface of the upper vehicle body 12. The 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. The width b of the space portion C is a lower portion of the first work implement A (boom 19) and It is slightly wider than the lower portion (the first boom 28) of the second work machine B.
[0031]
A hydraulic oil tank 47 is attached to the rear side of the left side of the upper vehicle body 12, that is, the rear side portion of the floor 43. The hydraulic oil tank 47 does not interfere when the floor 43 turns.
A fuel tank 48 is attached to the space C near the cover body 42. The fuel tank 48 does not interfere with the boom 19 of the first work machine A.
[0032]
Thus, the first and second booms 28 and 30 of the second work machine B are swung upward to bring the mixing agitator 34 to a position above the ground, and the floor 43 is set to the forward posture of FIG. The boom 19 and arm 21 of the work machine A are swung up and down, and the bucket 23 is swung up and down to perform bucket work such as excavation and loading. At this time, since the operator sitting on the seat 44 faces substantially forward, the operator can easily operate while looking at the first work machine A.
[0033]
The boom 19 of the first work machine A is swung upward to bring the bucket 23 to a position above the ground, and the floor 43 is in a substantially rearward position as indicated by a virtual line in FIG. 2 The mixing and stirring operation is performed by the mixing and stirring device 34 by swinging the booms 28 and 30 and the arm 32 downward. At this time, since the operator sitting on the seat 44 faces substantially rearward, it can be easily operated while looking at the second work machine B.
[0034]
At this time, since the second working machine B has the first and second booms 28 and 30 and the arm 32, the mixing stirrer 34 is set by bringing the first and second booms 28 and 30 and the arm 32 into a substantially horizontal state. It is possible to move farther than the upper vehicle body 12 and the work range is widened.
[0035]
Thus, since the bucket work and the mixing and stirring work can be performed with one work machine, road work and foundation work of the construction can be efficiently performed.
[0036]
In addition, since the first work machine A and the second work machine B are positioned substantially opposite each other with the turning center 12a of the upper vehicle body 12 as a boundary, when one work machine is working, the other work The machine can act as a counterweight and improve vehicle stability.
[0037]
In addition, when working on one work machine, the other work machine can be extended to play the role of a variable position counterweight, improving the stability of the vehicle body and expanding the work range of one work machine. it can.
[0038]
Further, the first and second work machines A and B are attached to the front and rear of the turning center 12a of the upper vehicle body 12 to improve the vehicle body stability in the front-rear direction, and the turning center of the upper vehicle body 12 is improved. Since the driver's seat 40 and the main drive device 41 are attached to the left and right sides with the boundary 12a as the vehicle body stability in the left-right direction is improved, the vehicle stability is excellent. The work machines A and B and the driver's seat 40 are separated in the left-right direction, and the visibility of the operator of the seat 44 is good.
[0039]
Further, the turning center of the driver's seat 40 is shifted to the left side with respect to the straight line connecting the mounting portion of the first work machine A and the mounting portion of the second work machine B, and the seat 44 is on the left side with respect to the straight line. Therefore, even if the floor 43 is not rotated 180 degrees, the operator sitting on the seat 44 can see the first work machine A and the second work machine B in an easy posture. Thereby, the turning angle of the driver's seat 40 can be made smaller than 180 degrees.
[0040]
Further, since the hydraulic oil tank 47 is attached to the left rear portion of the upper vehicle body 12, the vehicle stability in the left-right direction is further improved.
[0041]
Further, the lower work part of the first work machine and the lower work part of the second work machine are accommodated in the space C by swinging the first work machine A and the second work machine B upward.
As a result, the first work machine A and the second work machine B are reduced from protruding from the upper vehicle body 12, and the first and second work machines A and B are obstructed even if the upper swing body 12 is turned in a narrow place. The minimum turning radius can be reduced without interfering with objects.
[0042]
As shown in FIG. 2, the outer surface of the upper vehicle body 12 has a substantially arc shape centered on the turning center 12 a 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. The mounting body 16 and the mounting body 25 slightly protrude from the maximum turning radius c. However, the mounting body 16 and the mounting body 25 are positioned within the maximum turning radius c by swinging by the swing cylinders 18 and 27.
[0043]
Thus, the upper vehicle body 12 can be swung within the width of the pair of traveling bodies 10 with the mounting bodies 16 and 25 being swung, so that a very small turn is possible and the mounting bodies 16 and 25 are swung. If it does not move, the operator may turn while paying attention so that the mounting bodies 16 and 25 do not interfere with the obstacle, and need not be aware of the turning operation.
[0044]
Next, a structure for turning the driver's seat 40 will be described.
[0045]
As shown in FIGS. 3 and 4, the upper body 12 has a left frame 51 and a right frame (not shown) fixed to an intermediate frame 50, and a turning mechanism a is provided on the lower surface of the intermediate frame 50. A fixed ring 52 is fixed, and a movable ring 54 is rotatably supported on the fixed ring 52 via a bearing 53. The movable ring 54 is attached to the lower body 11 and attached to the intermediate frame 50. A pinion rotated by a motor is fitted to the inner teeth 54a of the movable ring 54, and the upper vehicle body 12 turns with respect to the lower vehicle body 11 by driving the motor.
[0046]
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 on the fixed ring 55 via a bearing 56. The lower part of the cylindrical body 58 is fixed to the movable ring 57, and the upper part of the cylindrical body 58 is fixed to the floor 43. A turning cylinder 61 is connected across the bracket 59 of the cylindrical body 58 and the bracket 60 attached to the upper surface 50a of the intermediate frame 50.
[0047]
Thus, the floor 43 is swung together with the cylindrical body 58 by extending and retracting the swiveling cylinder 61, thereby configuring the swivel mechanism 46.
[0048]
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.
[0049]
The hydraulic oil tank 57 is attached with a bolt 63 to a mounting portion 62 below the upper surface 51 a near the rear portion of the left side frame 51. Thereby, the height from the upper surface 51 a 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.
[0050]
The back portion 44 a of the seat 44 and the upper portion of the operation panel 63 protrude from the floor 43 toward the hydraulic oil tank 47 so as not to interfere with the hydraulic oil tank 47. As a result, the hydraulic oil tank 47 and the backrest portion 44a of the seat 44 and the upper portion of the operation panel 63 overlap in the front-rear direction without lowering the overall height of the hydraulic oil tank 47, so that the capacity of the hydraulic oil tank 47 is reduced without operation. The space for installing the seat 40 and the hydraulic oil tank 47 in the front-rear direction can be reduced.
[0051]
As described above, when the turning cylinder 61 is in the contracted state, the driver's seat 40 assumes the forward posture shown in FIG. 4, and the operator sitting on the seat 44 operates while looking at the first work machine A in an easy posture. it can.
[0052]
Further, when the turning cylinder 61 is extended, the driver's seat 40 turns almost 120 degrees as shown in FIG. 5 and has a substantially rearward posture, so that an operator sitting on the seat 44 can operate while looking at the second work machine B in an easy posture. .
[0053]
In addition, the corner portion closer to the center than the turning center 46a on the one end surface 43a on the seat 44 side of the floor 43 is not a right angle but an oblique direction. The distance from the oblique corner end face 64 to the turning center 46a is slightly shorter than the distance from the turning center 46a to the one end face 43a.
[0054]
Thus, 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 43 do not interfere when the floor 43 is turned.
[0055]
As shown in FIG. 6, the operation lever 45 operates a hydraulic pilot valve 70 or switches an operation valve (not shown) by a push-pull cable 71. The controller provided on the operation panel 62 is electrically connected. A cable 72 is connected.
[0056]
As shown in FIG. 6, the electric cable 72 is inserted through the hollow portions of the cylindrical body 58, the movable ring 57, and the fixed ring 55 and connected to the electric control device. In this way, the electric cable 72 is not twisted when the floor 43 is turned.
[0057]
As shown in FIGS. 6 and 7, the push-pull cable 71 is arranged in a circular arc along the outer periphery of the cylindrical body 58, and its one end 71a is connected via a lever 73, a rod 74, a lever 75, and the like. It links to the operation lever 45. The other end 71b of the push-pull cable 71 is linked to an operation valve (not shown).
[0058]
Specifically, the intermediate portion of the push-pull cable 71 is fixed to the upper vehicle body side by the first clamping jig 75, and is made to make one turn around the cylindrical body 58 from the fixing portion, and the portion is connected to the second body. The clamp jig 76 is fixed to the floor 43, and a portion closer to one end than the fixed portion is formed in an arc shape, and the one end 71a is connected to an arm swung by the lever 73.
[0059]
In this way, the push-pull cable 71 is compactly disposed below the floor 43, and the push-pull cable 71 is cylindrical when the floor 43 is turned approximately 120 degrees clockwise from the forward posture shown in FIG. The push-pull cable 71 is not damaged because it is displaced so as to be wound around the body 58.
[0060]
A plurality of hydraulic hoses 80 are connected to the hydraulic pilot valve 70. These hydraulic hoses 80 are fixed together on the floor 43 by a first hose clamp jig 81, and the left and right sides of the hydraulic hose 80 are fixed to the left side by a second hose clamp jig 82 by turning almost halfway around the cylindrical body 58. It is fixed to the part frame 51. Each hydraulic hose 80 between the first hose clamp jig 81 and the second hose clamp jig 82 is inserted into a thick hose 83 together.
[0061]
Thus, the hydraulic hose 80 is compactly disposed under the floor 43, and the hydraulic hose 80 is a cylindrical body 58 when the floor 43 is swung to the right from the forward posture shown in FIG. Therefore, the hydraulic hose 80 is not damaged.
[0062]
Since the push-pull cable 71 and the hydraulic hose 80 overlap vertically, a partition plate 84 is provided as shown in FIG. This can prevent the push-pull cable 71 and the hydraulic hose 80 from being rubbed and damaged.
[0063]
Next, a hydraulic circuit for supplying pressure oil to the turning cylinder 61 will be described.
As shown in FIG. 8, the discharge passage 91 of the hydraulic pump 90 is provided with a turning valve 92 and another hydraulic actuator valve 93. The turning valve 92 is set to the first position by supplying the pilot pressure from the hydraulic pilot valve 94 to the first pressure receiving portion 92a, is set to the second position by supplying the second pressure receiving portion 92b, and is otherwise neutral. It becomes position c.
[0064]
The turning valve 92 and the turning cylinder 61 are connected via a communication valve 95. When the communication valve 95 is set to the communication position D and the turning valve 92 is set to the first position A, pressure oil is supplied to the compression chamber 61a. When it is in the second position, pressure oil is supplied to the extension chamber 61b, and when it is in the neutral position C, the contraction chamber 61a and the extension chamber 61b are closed.
[0065]
Therefore, when the turning valve 92 is moved from the neutral position C to the first position A and the second position B, the turning cylinder 61 can be expanded and contracted and can be turned by the weight of the driver's seat 40.
[0066]
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 contraction chamber 61a and the expansion chamber 61b communicate with the tank 97, and the turning cylinder 61 expands and contracts by an external force. Thereby, the driver's seat 40 can be turned by human power when the engine fails or stops or the hydraulic pump 90 fails.
[0067]
In the above hydraulic circuit, when the turning valve 92 is set to the neutral position C, the pressure oil in the shrinking chamber 61a and the extending chamber 61b of the turning cylinder 61 may leak from the turning valve 92 to the tank. If the machine is left on the slope for a long time, the driver's seat 40 may turn by its own weight, so a double pilot check valve 98 is provided as shown in FIG. In this way, it is possible to surely 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 by its own weight even when the work machine is left on the slope for a long time.
[0068]
FIG. 10 shows a third embodiment of the hydraulic circuit. 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, and the pressure oil output from the hydraulic pilot valve 94 is shown. Thus, the turning cylinder 61 can be extended and contracted.
[0069]
This eliminates the need for a turning valve, thereby reducing costs.
[0070]
In this case, a double pilot check valve 98 is provided in the first and second pilot circuits 99 and 100 so that the hydraulic oil does not flow from the turning cylinder 61 to the hydraulic pilot valve 94 when the hydraulic pilot valve 94 is not operated. This prevents the driver seat 40 from turning due to its own weight on the slope.
[0071]
Next, a second embodiment of the turning mechanism 46 will be described.
As shown in FIGS. 11 and 12, a fixed ring 110 is fixed to the upper vehicle body 12 (the left frame 51, a movable ring 111 is rotatably supported by a bearing 112 on the fixed ring 110, and the movable ring 111 is mounted on the floor. It fixes to the lower surface of 43. The pinion 115 is rotated through the reduction gear 114 with the turning motor 113 attached to the left side frame 51, and the pinion 115 is fitted to the internal teeth 116 of the movable ring 111.
[0072]
In this way, it is possible to turn the floor 43 by 360 degrees by driving the turning motor 113, and the seat 44 can be in the forward posture and the backward posture.
[0073]
In this case, the swivel joint 117 is attached to the turning center. The 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, pressure oil and electricity can be transmitted between the floor 43 and the left side frame 51.
[0074]
FIG. 13 is a hydraulic circuit diagram of the turning motor 113, which is the same as the turning cylinder 61. In this case, when the turning valve 92 is set to the first position A and the second position B, the pressure oil is supplied to the first port 113a and the second port 113b of the turning motor 113 to rotate forward and backward.
[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 connection of a push-pull cable and a hydraulic hose to a driver's seat.
FIG. 7 is a plan view showing 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 work machine B ... 2nd work machine 10 ... Running body 11 ... Lower vehicle body 12 ... Upper vehicle body 40 ... Driver's seat 43 ... Floor 44 ... Seat 45 ... Operation lever 46 ... Turning mechanism 47 ... Hydraulic oil tank 50 ... Middle Part claim 51 ... left side frame 58 ... cylindrical body 61 ... turning cylinder 71 ... push-pull cable 80 ... hydraulic hose 90 ... hydraulic pump 92 ... turning 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 ... Swing pump 117 ... Swivel joint

Claims (5)

An upper vehicle body 12 is turnably attached to a lower vehicle body (11) provided with a traveling body (10), and a first work machine provided with different work tools at a position substantially opposite to the turning center of the upper vehicle body (12). (A) and the second work machine (B) are mounted so as to be swingable up and down,
A seat (44) and a steering member are attached to the floor (43) to form a driver seat (40).
The floor (43) of the driver's seat (40) is placed on the upper vehicle body (12), the seat (44) is substantially in the first position toward the first work machine (A), and the seat (44) is almost in the first position. 2 It is attached so that it can turn over the second posture toward the work machine (A),
A turning mechanism (46) is provided across the upper vehicle body (12) and the floor (43),
A work characterized in that the turning center of the driver's seat (40) is offset to the left side with respect to a straight line connecting the attachment part of the first work machine (A) and the attachment part of the second work machine (B). machine. A cylindrical body (58) is attached to the upper vehicle body (12) so as to be rotatable about the vertical axis, and a floor (43) of a driver's seat (40) is attached to the cylindrical body (58). The work machine according to claim 1, wherein a turning cylinder (61) is connected to the upper body (12) to form a turning mechanism (46) of the driver seat (40) . A fixed ring (110) fixed to the vehicle body (12), a movable ring (111) rotatably supported by the fixed ring (110) and fixed to the floor (43), and an upper vehicle body (12). The work machine according to claim 1, wherein a turning mechanism (46) is constituted by a turning motor (113) for rotating the movable ring (111) . Discharge pressure oil from the hydraulic pump (90) is supplied to the shrinking chamber (61a) and the extension chamber (61b) of the turning cylinder (61 ) or the first port (113a) and the second port (113b) of the turning motor (113 ). The work machine according to claim 2 or 3, wherein means for short-circuiting the two circuits and communicating with the tank are provided in the two circuits supplied to .
Operating device. Discharge pressure oil from the hydraulic pump (90) is supplied to the shrinking chamber (61a) and the extension chamber (61b) of the turning cylinder (61 ) or the first port (113a) and the second port (113b) of the turning motor (113 ). The work machine according to claim 2 or 3, wherein a double pilot check valve (98) for preventing backflow of pressure oil from the turning cylinder (61) or the turning motor (113) is provided in the two circuits supplied to the rotating machine. .

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