JPH09235759A - Control circuit of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a sufficient operational responsiveness in both attachment and movable actuation part and improve the operational responsiveness when both are simultaneously operated. SOLUTION: This control circuit is provided with a main fluid hydraulic circuit 101 with the first hydraulic pump 1A operating actuators 34, 65 for driving an attachment and a movable actuation part, the second hydraulic pump 1B operating an actuator for driving a construction machine, control valves 12, 13, and a control valve for the construction machine, hydraulic circuits 107 108 of the pilot fluid for the construction machine, and an auxiliary fluid hydraulic circuit 104 supplying the hydraulic oil from the second hydraulic pump 1B to the actuators 34, 65. And further, the circuit is provided with a control structure 46 to control the supply condition of the hydraulic oil from the second hydraulic pump 1B to the control valve side for the attachment and/or to the control valve side for the movable actuation part, and an auxiliary control valve 11 so as to be controlled to supply the hydraulic fluid from the second hydraulic pump 1B to the auxiliary hydraulic pressure circuit side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic circuit of a working machine such as a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art Conventionally, in a construction machine such as a hydraulic excavator, as shown in FIG. 5, a construction machine main body (work machine main body) 50 with a driving operation room 64 is freely rotatable on a lower traveling body 61 in a horizontal plane. It is provided in. A boom 51 is pivotally attached to the construction machine main body 50 by a pin 51A so as to be vertically rotatable, and a pin 54A is attached to the tip of the boom 51.
As a result, the stick 54 is pivotally attached in a vertically rotatable manner. Since the boom 51 and the stick 54 are formed in an arm shape, they are also referred to as an arm portion. Further, the movable attachment 30 is pivotally attached to the tip of the stick 54 by a pin 30c so as to be vertically rotatable. The tip of the movable attachment 30 is provided with claw-shaped members 30a and 30b, and in particular, the lower member 30a is an unmovable upper member 30b.
Since it can be movably provided so as to come in contact with and away from, it is hereinafter referred to as a movable operation part. The movable operation part 30a may be mounted on the upper side and the non-movable member 30b may be mounted on the lower side. Further, the lower member 30a and the upper member 30b
Both of them may be configured as movable operation parts.

A boom drive hydraulic cylinder device (boom drive actuator) 52 for driving the boom 51 is provided between the construction machine body 50 and the boom 51. A stick drive hydraulic cylinder device (stick drive actuator) 55 for driving the stick 54 is provided between the boom 51 and the stick 54. Further, an attachment driving hydraulic cylinder device (attachment driving actuator) 34 for driving the attachment 30 is provided between the stick 54 and the attachment 30, and the attachment 30 is further provided.
Between the movable operating portion 30a and the movable operating portion 30a.
A hydraulic cylinder device for driving a movable operation portion (actuator for driving a movable operation portion) 65 for driving the actuator is provided.

Further, the attachment driving hydraulic cylinder device 34 is pivotally attached to the attachment 30 via rods 58 and 59. In order to control each of these hydraulic cylinder devices, a working machine hydraulic circuit (working machine main fluid pressure circuit) 101 as shown in FIG. 4 is provided. In the hydraulic circuit diagram of FIG. 4, particularly, the part relating to the control of the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65 is mainly shown. As shown in FIG. 4, the hydraulic circuit 101 includes a first circuit unit 10 having a first hydraulic pump (first fluid pressure pump) 1A.
2 and a second circuit portion 103 having a second hydraulic pump (second fluid pressure pump) 1B.

In the first circuit section 102, oil passages 5, 18, 2 are provided.
0, 27, 31, etc., and the control valve 12 for movable operation parts and the control valve 13 for attachment which are interposed in these oil passages, the control valve 6 for straight traveling, the control valve 8 for right traveling motor 8, the boom. The control valve 14 for sticks, the control valve 15 for sticks, etc. are provided. In the second circuit unit 103, the oil passages 4, 16 and the like,
A left traveling motor control valve 7, a swing motor control valve 9, a stick control valve 10, a boom control valve 11 and the like are provided in these oil passages. The control valve 6
˜15 are stored in the control unit 3.

Here, since the control valve 12 for the movable operating portion and the control valve 13 for the attachment are focused, control valves other than the control valve 12 for the movable operating portion and the attachment control valve 13, that is, the control valve 6 for straight traveling. , Left traveling motor control valve 7, right traveling motor control valve 8, swing motor control valve 9, boom control valves 11 and 14, stick control valve 1
Control valves such as 0 and 15 are called working machine control valves to distinguish them from the movable operating part control valve 12 and the attachment control valve 13.

A pilot hydraulic circuit for working machine (pilot fluid pressure circuit for working machine) is provided to control the control valves 6 to 15. In FIG. 4, only the pilot hydraulic circuits relating to the movable operating part control valve 12 and the attachment control valve 13 are shown by broken lines, and the pilot hydraulic circuits 22, 2 are provided in the pilot hydraulic circuit for the working machine.
3, 25, 26, a pilot pump 2, and a pilot control valve (not shown) are provided.

Among them, the pilot control valve is provided with an attachment operating device 2 so as to interlock with an attachment operating lever 24a as an attachment operating member.
The one for attachment equipped in 4 and the operation pedal 21 for the movable operation part as the operation member for the movable operation part
There is one for the movable operation part provided in the operating device 21 for the movable operation part so as to interlock with a.

With such a configuration, the attachment 3
In order to operate 0 or the movable operating portion 30a, the attachment operating member 24a and the movable operating portion operating member 21a in the driving operation room 64 are operated so that the pilot hydraulic pressure passes through the pilot oil passages 22, 23, 25, 26. The attachment control valve 13 and the movable operation part control valve 12 are actuated to drive the attachment control valve 13 and the movable operation part control valve 12 to a desired position. As a result, the hydraulic oil of the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65 is adjusted to be supplied and discharged, and these cylinder devices 34 and 65 are driven to expand and contract to a required length.

For example, in order to lower the attachment 30, the attachment driving hydraulic cylinder device 34 may be extended. In this case, the pilot oil pressure is applied to the attachment control valve 13 through the pilot oil passage 25. As a result, the attachment control valve 13
The spool position is the attachment lowering position, and the hydraulic oil from the first hydraulic pump 1A is supplied to one chamber of the attachment driving hydraulic cylinder device 34 through the oil passages 5, 31, 32. On the other hand, the hydraulic oil in the other chamber of the attachment driving hydraulic cylinder device 34 is transferred to the oil passages 33, 2
It is discharged to the reservoir tank 19 via 0. As a result, the attachment driving hydraulic cylinder device 34 extends, while the attachment 30 is rotated downward as indicated by the arrow a.

On the contrary, in order to raise the attachment 30, the hydraulic cylinder device 34 for driving the attachment may be contracted. In this case, the pilot oil pressure is applied to the attachment control valve 13 through the pilot oil passage 25. As a result, the spool position of the attachment control valve 13 becomes the attachment raising position,
The hydraulic oil from the hydraulic pump 1A is supplied to the other chamber of the attachment driving hydraulic cylinder device 34 through the oil passages 5, 31, 33. On the other hand, the hydraulic oil in the one chamber of the attachment driving hydraulic cylinder device 34 is transferred to the oil passages 32, 20.
And then discharged to the reservoir tank 19. This allows
While the attachment driving hydraulic cylinder device 34 contracts, the attachment 30 is rotated upward as indicated by the arrow b.

Further, the movable operating portion 30a is raised (that is, it is driven to the closing side so as to approach the claw portion 30b).
In order to do so, the movable operating part driving hydraulic cylinder device 65 may be extended. In this case, the pilot hydraulic pressure is applied to the movable operating part control valve 12 through the pilot oil passage 23. As a result, the spool position of the movable operating part control valve 12 becomes the movable operating part raising position, and the hydraulic oil from the first hydraulic pump 1A passes through the oil passages 5, 27, 29, and the movable operating part driving hydraulic cylinder. It is supplied to one chamber of the device 65. On the other hand, the hydraulic oil in the other chamber of the movable operating portion driving hydraulic cylinder device 65 is discharged to the reservoir tank 19 through the oil passages 28 and 20. As a result, the movable operating portion 30a is rotated upward as shown by the arrow c while the movable operating portion driving hydraulic cylinder device 65 extends.

On the contrary, in order to lower the movable operating portion 30a (that is, to drive the movable operating portion 30a to the opening side so as to be separated from the claw portion 30b), the movable operating portion driving hydraulic cylinder device 65 may be contracted. In this case, the pilot oil passage 22
The pilot hydraulic pressure is applied to the movable operating part control valve 12 through. As a result, the spool position of the movable operating part control valve 12 becomes the movable operating part lowering position, and the hydraulic oil from the first hydraulic pump 1A passes through the oil passages 5, 27, 28, and the movable operating part driving hydraulic cylinder. The device 65 is supplied to another room. On the other hand, the hydraulic oil in one chamber of the hydraulic cylinder device 65 for driving the movable operating part is discharged to the reservoir tank 19 via the oil passages 29 and 20. As a result, the hydraulic cylinder device 65 for driving the movable operating portion contracts,
The movable operation part 30a is rotated downward as shown by the arrow d.

Furthermore, the hydraulic cylinder device 34 for driving the attachment and the hydraulic cylinder device 65 for driving the movable operating part are provided.
In order to maintain the current state of the control valve, the pilot hydraulic pressure is appropriately applied to the attachment control valve 13 and the movable operation part control valve 12 to adjust the spool positions of the attachment control valve 13 and the movable operation part control valve 12. It may be set to a neutral position (hydraulic pressure supply / discharge passage cutoff position). As a result, the supply and discharge of hydraulic oil in the oil chambers of the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65 are stopped, and the attachment 30 and the movable operating part 30a are held at their current positions.

By the way, in order to operate a work machine other than the attachment 30 and the movable operation part 30a, for example, the boom 51, the stick 54, etc., a work machine operation member (not shown) in the operation operation room 64 is operated to operate the pilot hydraulic pressure. Is operated on each work machine control valve to drive each work machine drive actuator (not shown in FIG. 4). For example, the hydraulic fluid (pressure working fluid) supplied from the first hydraulic pump 1A and the second hydraulic pump 1B is supplied to the working machine driving actuator via the working machine control valve and discharged from the working machine driving actuator. The hydraulic oil thus discharged is discharged to the reservoir tank 19.

When all the working machine operating members are neutral, the hydraulic oil supplied from the first hydraulic pump 1b is discharged to the reservoir tank 19 through the oil passages 5 and 18, and supplied from the second hydraulic pump 1a. The hydraulic oil is discharged to the reservoir tank 19 through the oil passages 4 and 16. In the construction machine configured as described above, the working machine is moved by the lower traveling body 61 to roughly determine the position of the target object 63 such as rock or concrete to be worked. Next, the attachment 30 is driven to adjust the final position with respect to the target 63, and at the same time, the movable operating portion 30a is driven to crush the target 63. That is, in this case, by operating the attachment operating member and the movable operating portion operating member at the same time, the pilot hydraulic pressure is applied to the attachment control valve 13 and the movable operating portion control valve 12, and the attachment driving hydraulic cylinder device 34 is operated. The hydraulic cylinder device 65 for driving the movable operating portion is expanded / contracted to drive the attachment 30 and the movable operating portion 30a. At this time, the simultaneous operability of the movable operation part 30a and the attachment 30 becomes important.

[0017]

By the way, in the work machine control circuit of the conventional work machine as described above, both the hydraulic pressure for driving the attachment and the hydraulic pressure for driving the movable operating part are the first.
Since the hydraulic oil is supplied from the hydraulic pump 1A, when the attachment operating member 24a and the movable operating portion operating member 21a are simultaneously operated, the attachment driving hydraulic cylinder device 34 and the movable operating portion driving hydraulic cylinder device 65 are operated. Of these, hydraulic oil is supplied in order from the one that requires less pressure for driving, and the supplied oil is driven in order. Therefore, even if the attachment operating member 24a and the movable operating portion operating member 21a are simultaneously operated, the attachment 30 and the movable operating portion 30a are operated.
Both of them do not operate at the same time, and it is difficult to obtain a sufficient operation speed, and there is a problem that they do not have good operation response at the time of simultaneous operation.

The present invention has been devised in view of the above problems, and secures sufficient operation responsiveness for both the attachment and the movable operation part, and particularly, for the operation responsiveness when these are operated at the same time. An object of the present invention is to provide a work machine control circuit for a work machine that can be improved.

[0019]

For this reason, the working machine control circuit of the working machine of the present invention (claim 1) is equipped with a movable attachment having a movable actuation portion which is attached to the arm portion such that the posture thereof can be changed. In the working machine described above, an attachment driving actuator for driving the attachment, a movable operating portion driving actuator for driving the movable operating portion of the attachment, the attachment driving actuator, and the movable operating portion driving actuator. A first fluid pressure pump for pressurizing a pressure working fluid for driving an actuator;
An attachment control valve for controlling the supply state of the pressure working fluid from the fluid pressure pump to the attachment driving actuator, and a supply state of the pressure working fluid from the first fluid pressure pump to the movable working portion driving actuator And a working machine driving actuator for driving the working machine other than the attachment and the movable working section, and a pressure working fluid for driving the working machine driving actuator. A working machine main fluid pressure circuit having at least a second fluid pressure pump for pressurizing and a working machine control valve for controlling a supply state of a pressure working fluid from the second fluid pressure pump to the working machine actuator are provided. At the same time, a pilot pump that generates a control pressure fluid and a control pressure fluid from the pilot pump In order to control the supply state to the attachment control valve, the movable operating part control valve, and the working machine control valve, a plurality of working machine operating members including an operating member for operating the attachment and the movable working part described above are interlocked. A pilot fluid pressure circuit for a working machine having at least a pilot control valve, wherein the pressure working fluid from the second fluid pressure pump is passed through the attachment control valve and the movable working part control valve. An auxiliary fluid pressure circuit that can be supplied to the drive actuator and the movable actuation part drive actuator, and the pressure actuation fluid from the second fluid pressure pump to the attachment control valve side and / or the movable actuation part control valve side. To control the supply state, the control valve mechanism interposed in the auxiliary fluid pressure circuit, the attachment, and the movable operation part are operated. An auxiliary control valve that is controlled to supply the pressure working fluid from the second fluid pressure pump to the auxiliary fluid pressure circuit side by a pilot control valve that is interlocked with the operating member that operates. There is.

Further, a working machine control circuit for a working machine according to the present invention (claim 2) is the control circuit according to claim 1, wherein the control valve mechanism supplies the pressure working fluid from the second fluid pressure pump. It is characterized in that it is configured as a flow rate control valve mechanism for controlling the flow rate to be distributed to the attachment control valve side and the movable operation part control valve side.

Furthermore, a working machine control circuit for a working machine according to the present invention (claim 3) is the control circuit according to claim 1,
The control valve mechanism is configured as a switching control valve mechanism that performs switching control so as to supply the pressure working fluid from the second fluid pressure pump to either the attachment control valve side or the movable operation part control valve side. It is characterized by

In addition, the working machine control circuit of the working machine of the present invention (claim 4) is the control circuit according to any one of claims 1 to 3, wherein the working machine control valve is the auxiliary control valve. The control valve for the working machine is also used as the attachment,
The supply of the pressure working fluid from the second fluid pressure pump to the working machine actuator is stopped by the pilot control valve that is interlocked with the operating member that operates the movable working portion, so that the second fluid pressure pump It is characterized in that the pressure working fluid is configured to be supplied to the auxiliary fluid pressure circuit side.

Further, a working machine control circuit of the working machine of the present invention (claim 5) is the control circuit according to claim 4,
A working machine pilot fluid pressure circuit includes a first pilot fluid pressure circuit for the working machine control valve that also serves as the auxiliary control valve, and a first pilot fluid pressure circuit for the attachment control valve and the movable operation part control valve. Two pilot fluid pressure circuits are included, and the first pilot fluid pressure circuit and the second pilot fluid pressure circuit are connected via a shuttle valve.

A work machine control circuit for a work machine according to the present invention (claim 6) is the control circuit according to any one of claims 1 to 3, wherein the auxiliary fluid pressure circuit is configured as an external piping circuit. It is characterized by that. Further, in a work machine control circuit for a work machine according to the present invention (claim 7), in the control circuit according to claim 2, the flow control valve mechanism includes a control valve side auxiliary fluid pressure circuit portion for attachment and a movable operating portion. The control valve side auxiliary fluid pressure circuit section is provided with a flow rate control orifice respectively interposed therein.

Further, the working machine control circuit of the working machine of the present invention (claim 8) is the control circuit according to claim 3, wherein the switching control valve mechanism is movable with the auxiliary fluid pressure circuit part on the control valve side for attachment. Control valve side for actuating portion is configured as a switching valve interposed in the auxiliary fluid pressure circuit portion, and the switching valve is provided from the first fluid pressure pump to the control valve side for attachment and the control valve side for movable operating portion. It is characterized in that it is configured to be switched by the pressure of the pressure working fluid supplied to the.

A working machine control circuit for a working machine according to the present invention (claim 9) is the control circuit according to claim 8, wherein the auxiliary fluid pressure circuit includes a check valve upstream of the switching valve. It is characterized by that.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG.
1 shows a work machine control circuit of a work machine as an embodiment, FIG. 1 is a work machine control hydraulic circuit diagram for explaining the configuration, and FIG. 2 is another structure example of a flow control valve mechanism. It is a figure, and in FIG. 1 and FIG. 2, the same code | symbol as FIG. 4 shows a substantially similar part.

The working machine to which the present embodiment is applied is also a construction machine such as a hydraulic excavator as shown in FIG. 5, and this construction has already been described, but as shown in FIG. A construction machine main body (work machine main body) 50 with a driving operation room 64 is rotatably provided on a traveling body 61 in a horizontal plane, and a boom 51 is pivotally mounted on the construction machine main body 50 so as to be vertically rotatable. The boom 54 and the stick 54 are pivotally attached to the tip of the boom 51 so as to be rotatable in the vertical direction. The boom 51 and the stick 54 form an arm portion. The movable attachment 30 is attached to the tip of the stick 54. Is rotatably pivoted in the vertical direction, and a movable claw-shaped member 30a that is not movable upward and a movable claw-shaped member (movable operating portion) 30b that is movable downward are provided at the tip of the movable attachment 30. Which it is equipped. It should be noted that a non-movable claw-shaped member 30a may be provided below and a movable claw-shaped member 30b may be provided above. Further, both the lower member 30a and the upper member 30b may be configured as movable operation parts.

A boom drive hydraulic cylinder device (boom drive actuator) 52 is provided between the construction machine main body 50 and the boom 51, and a stick drive hydraulic cylinder device (boom drive actuator) 52 is provided between the boom 51 and the stick 54. A hydraulic cylinder device (stick driving actuator) 55 is provided, and between the stick 54 and the attachment 30,
An attachment driving hydraulic cylinder device (attachment driving actuator) 34 is provided. Further, between the attachment 30 and the movable operating portion 30a, a movable operating portion driving hydraulic cylinder device (movable operating portion driving actuator) 65 for driving the movable operating portion 30a is provided.

Further, the attachment driving hydraulic cylinder device 34 is pivotally attached to the attachment 30 via rods 58 and 59. Further, in order to control each hydraulic cylinder device, a working machine hydraulic circuit (working machine main fluid pressure circuit) 101 as shown in FIG. 1 is provided. In the hydraulic circuit diagram of FIG. 1, particularly, a part relating to the control of the attachment driving hydraulic cylinder device 34 as the attachment driving actuator and the movable working part driving hydraulic cylinder device 65 as the movable working part driving actuator is mainly shown. There is.

As shown in FIG. 1, the hydraulic circuit 101 includes a first circuit portion 102 having a first hydraulic pump (first fluid pressure pump) 1A and a second hydraulic pump (second fluid pressure pump) 1.
And a second circuit portion 103 having B. Also,
An auxiliary hydraulic circuit (auxiliary fluid pressure circuit) 104 is attached to the second circuit portion 103. The auxiliary hydraulic circuit 1
04 may be attached as an external piping circuit. Thereby, the working machine can be easily improved.

In the first circuit section 102, oil passages 5, 18, 2 are provided.
0, 27, 31, etc., and the control valve 12 for movable operation parts and the control valve 13 for attachment which are interposed in these oil passages, the control valve 6 for straight traveling, the control valve 8 for right traveling motor 8, the boom. The control valve 14 for sticks, the control valve 15 for sticks, etc. are provided. In the second circuit unit 103, the oil passages 4, 16 and the like,
A left traveling motor control valve 7, a swing motor control valve 9, a stick control valve 10, an auxiliary control valve 11 which also serves as a boom control valve, and the like are provided in these oil passages. In the auxiliary hydraulic circuit 104, an oil passage 45, an oil passage (control valve side auxiliary fluid pressure circuit portion for attachment) 47, an oil passage (control valve side auxiliary fluid pressure circuit portion for movable operation part) 48,
A flow rate control valve mechanism (control valve mechanism) 46 interposed in these oil passages 47 and 48 is provided. The control valves 6 to 15 are housed in the control unit 3.

Since the control valve 12 for the movable operating portion and the control valve 13 for the attachment are focused here, the control valves other than the control valve 12 for the movable operating portion and the control valve for the attachment 13, that is, the control valve 6 for straight traveling. , Control valve 7 for left traveling motor, control valve 8 for right traveling motor, swing motor control valve 9, auxiliary control valve 11 which also functions as a boom control valve, boom control valve 14, stick control valves 10, 15 The control valve is called a working machine control valve to distinguish it from the movable operation part control valve 12 and the attachment control valve 13.

Here, the attachment control valve 13 is
The spool can be switched between three stages (attachment raising position, neutral position, attachment lowering position). At the attachment raising position, the hydraulic oil (pressure working fluid) from the first hydraulic pump 1A is supplied to one chamber of the attachment driving hydraulic cylinder device 34 via the oil passage 33, and the attachment driving position is driven via the oil passage 32. The hydraulic oil is discharged from the other chamber of the hydraulic cylinder device 34 to the reservoir tank 19 side. At the attachment lowering position, the hydraulic oil from the first hydraulic pump 1A is passed through the oil passage 32.
The hydraulic oil is supplied to the other chamber of the attachment driving hydraulic cylinder device 34 via the oil passage 33, and the working oil is discharged from one chamber of the attachment driving hydraulic cylinder device 34 to the reservoir tank 19 side via the oil passage 33. At the neutral position, the supply and discharge of hydraulic oil to and from the attachment driving hydraulic cylinder device 34 is stopped.

Therefore, the first hydraulic pump 1A, the attachment control valve 13, the attachment driving hydraulic cylinder device 34, and the reservoir tank 19 are connected to each other through an oil passage. The movable operation part control valve 12 can switch the spool in three stages (movable operation part raising position, neutral position, movable operation part lowering position). The movable operating portion raising position supplies the hydraulic oil from the first hydraulic pump 1A to one chamber of the movable operating portion driving hydraulic cylinder device 65, and stores the operating oil from the other chamber of the movable operating portion driving hydraulic cylinder device 65. It is discharged to the tank 19 side. The movable operating portion lowering position supplies the operating oil from the first hydraulic pump 1b to the other chamber of the moving operating portion driving hydraulic cylinder device 65, and stores the operating oil from one chamber of the moving operating portion driving hydraulic cylinder device 65. It is discharged to the tank 19 side. At the neutral position, the supply and discharge of hydraulic oil to and from the hydraulic cylinder device 65 for driving the movable operating part is stopped.

For this reason, the first hydraulic pump 1A, the movable operating part control valve 13, the movable operating part driving hydraulic cylinder device 65, and the reservoir tank 19 are mutually connected via an oil passage. Auxiliary control valve 1 that also functions as a boom control valve
1 stops the supply of the hydraulic oil from the second hydraulic pump 1B to the boom driving hydraulic cylinder (one of the working machine actuators) 52, so that the hydraulic oil from the second hydraulic pump 1B is fed to the auxiliary hydraulic circuit 104 side. It is controlled to supply to. Here, the boom control valve 11, which is one of the work machine control valves, also serves as an auxiliary control valve, but another work machine control valve may also serve as an auxiliary control valve. In addition, for example, a dedicated auxiliary control valve 11 may be provided in the branch path C.

The auxiliary control valve 11 is capable of switching the spool in three stages (the auxiliary fluid pressure circuit side switching position, the neutral position, and the boom drive hydraulic cylinder supply position). At the auxiliary fluid pressure circuit side switching position, the supply of hydraulic oil from the second hydraulic pump 1B to the boom driving hydraulic cylinder 52 is stopped, and the hydraulic oil from the second hydraulic pump 1B is fed to the auxiliary hydraulic circuit (auxiliary fluid pressure circuit). It is supplied to the 104 side. At the boom drive hydraulic cylinder supply position, the hydraulic fluid from the second hydraulic pump 1B is used to control another boom drive control valve (not shown) and the boom drive hydraulic cylinder 52.
To be supplied to The neutral position is the second hydraulic pump 1.
The hydraulic fluid from B is not particularly controlled.

The flow control valve mechanism 46 is used for the second hydraulic pump 1.
The hydraulic oil from B is arbitrarily distributed to the attachment control valve 13 side and the movable operation part control valve 12 side, and the attachment control valve side auxiliary fluid pressure circuit part 47 of the auxiliary hydraulic circuit 104, the movable operation part The flow rate control orifices 46a and 46b, which are respectively interposed in the control valve side auxiliary fluid pressure circuit portion 48, are integrally configured.

Further, it is preferable that the flow control orifice has a pressure compensation. Further, the flow control orifice 4
6a and 46b are not necessarily integrated as a flow control valve mechanism 46.
As shown in FIG. 2, the flow rate is separately provided to the attachment control valve side auxiliary fluid pressure circuit portion 47 of the auxiliary hydraulic circuit 104 and the movable operation part control valve side auxiliary fluid pressure circuit portion 48 as shown in FIG. Control orifices 46a, 46b
May be provided to configure the flow control valve mechanism 46.

Furthermore, a work machine pilot hydraulic circuit (work machine pilot fluid pressure circuit) is provided to control the control valves 6 to 15. In FIG. 1, only the pilot hydraulic circuit relating to the movable control valve 12, the attachment control valve 13, and the auxiliary control valve 11 that also functions as the boom control valve is indicated by broken lines. The work machine pilot hydraulic circuit includes a first pilot hydraulic circuit 108 and a second pilot hydraulic circuit 107. The first pilot hydraulic circuit 108 controls the auxiliary control valve 11 by causing the pilot hydraulic pressure (control pressure fluid) to act on the auxiliary control valve 11 that also functions as a boom control valve.
49, a pilot pump 2, a pilot control valve (not shown), and an on / off control valve 41 interposed in the pilot oil passages 42, 49.

The second pilot hydraulic circuit 107 controls the attachment control valve 13 by applying a pilot hydraulic pressure to the attachment control valve 13 to control the attachment pilot hydraulic circuit (pilot fluid pressure circuit) 105.
And a movable operating part pilot hydraulic circuit 106 for controlling the movable operating part control valve 12 by causing the pilot hydraulic pressure to act on the movable operating part control valve 12.

Attachment pilot hydraulic circuit 10
5, pilot oil passages 25 and 26, a pilot pump 2, a pilot control valve (not shown), and a shuttle valve 37 interposed in the pilot oil passages 25 and 26 are provided. Here, the pilot control valve is attached to the attachment operating device 24 so as to interlock with the attachment operating lever 24a serving as an attachment operating member.
It is equipped within.

Pilot hydraulic circuit 106 for movable operation part
Is the pilot oil passages 22 and 23 and the pilot pump 2
, A pilot control valve (not shown), and a shuttle valve 35 provided in the pilot oil passages 22 and 23. Here, the pilot control valve is provided in the movable operating portion operating device 21 so as to interlock with the movable operating portion operating pedal 21a serving as the movable operating portion operating member.

The first pilot hydraulic circuit 108 and the second pilot hydraulic circuit 107 are connected to the pilot oil passage 3
6, 38, the shuttle valve 39 provided in the pilot oil passages 36, 38, 40, and the pilot oil passage 40. Here, the shuttle valve 37 moves any of the pilot oil pressures supplied through the pilot oil passage 25 and the pilot oil passage 26 when the pilot oil passage 25 and the pilot oil passage 26 are connected by the movement of the ball-shaped valve element. The larger pilot oil pressure can be supplied to the pilot oil passage 38. Due to the movement of the ball-shaped valve element, the shuttle valve 35 has a larger one of the pilot oil pressures supplied through the pilot oil passage 22 and the pilot oil passage 23 when the pilot oil passage 22 and the pilot oil passage 23 are connected. The pilot oil pressure can be supplied to the pilot oil passage 36. The shuttle valve 39 moves the ball-shaped valve element so that the pilot oil passage 38 and the pilot oil passage 36 are connected when the pilot oil passage 38 and the pilot oil passage 36 are connected.
The pilot oil pressure, whichever is larger, of the pilot oil pressures supplied through the pilot oil passage 36 can be supplied to the pilot oil passage 36.

Further, the on / off control valve 41 receives the pilot hydraulic pressure for boom control and controls the connection / disconnection of the pilot oil passage 42. The work machine control circuit of the work machine according to the present embodiment is configured as described above, and thus operates as follows. First, the attachment 30
In order to operate, the operation lever 24a for the attachment in the operation operation room 64 is operated to operate the pilot control valve interlocking with the operation lever 24a for the attachment. Thereby, the supply state of the pilot hydraulic pressure from the pilot pump 2 is controlled, the pilot hydraulic pressure is made to act on the attachment control valve 13 through the pilot oil passage 25 or the pilot oil passage 26, and the attachment control valve 13 is moved to a desired position. To drive. As a result, the hydraulic fluid of the attachment driving hydraulic cylinder device 34 is adjusted to be supplied or discharged, and the cylinder device 34 is driven to expand and contract to a required length.

Further, in order to operate the movable operation part 30, the operation pedal 21 for the movable operation part in the driving operation room 64 is used.
By operating a, the operation pedal 21 for the movable operation part
Operate the pilot control valve that is linked with a. By this, the supply state of the pilot oil pressure from the pilot pump 2 is controlled, and the pilot oil pressure is controlled by the pilot oil passage 2
2 or the pilot oil passage 23 to act on the movable operating part control valve 12 to drive the movable operating part control valve 12 to a desired position. As a result, the hydraulic fluid of the movable operating part driving hydraulic cylinder device 65 is adjusted to be supplied or discharged, and the cylinder device 65 is driven to expand and contract to a required length.

For example, in order to lower the attachment 30 and simultaneously raise the movable operating portion 30a (that is, to drive the movable operating portion 30a toward the closing side so as to approach the claw portion 30b), the hydraulic cylinder device 34 for driving the attachment and the movable operating portion. The driving hydraulic cylinder device 65 may be extended at the same time. In this case, the attachment operation lever 24a and the movable operation part operation pedal 21 in the driving operation room 64
By operating a at the same time, the pilot oil pressure is applied to the attachment control valve 13 through the pilot oil passage 25, and the pilot oil pressure is applied to the movable operating part control valve 12 through the pilot oil passage 23.

At this time, the pilot oil passage 25 and the pilot oil passage 26 are connected to the pilot oil passage 38 via the shuttle valve 37. In this case, the pilot oil passage 2
Since the pilot oil pressure of No. 5 is higher than the other, the pilot oil pressure is supplied from the pilot oil passage 25 to the pilot oil passage 38 by the action of the shuttle valve 37. Similarly, the pilot oil passage 23 and the pilot oil passage 22 are connected to the pilot oil passage 36 via the shuttle valve 35. In this case, the pilot oil pressure of the pilot oil passage 23 becomes larger, so the shuttle valve 35 By the action of, the pilot oil pressure is supplied from the pilot oil passage 23 to the pilot oil passage 38.

Further, the pilot oil passage 38 and the pilot oil passage 36 are the pilot oil passage 42 and the shuttle valve 39.
The larger pilot hydraulic pressure of the pilot hydraulic passage 38 and the pilot hydraulic passage 36 is supplied to the pilot hydraulic passage 42 by the action of the shuttle valve 35. . At this time, since the pilot hydraulic pressure for boom control is not supplied, the on / off control valve 41 is turned on, and the pilot hydraulic pressure is supplied as it is to the auxiliary control valve 11 that also serves as the boom control valve.

Therefore, the pilot oil pressure is applied to the attachment control valve 13 through the pilot oil passage 25, the pilot oil pressure is applied to the movable operating part control valve 12 through the pilot oil passage 23, and the pilot oil passage 38 or the pilot oil passage is provided. Through the 36 and the pilot oil passage 42, the pilot oil pressure is also applied to the auxiliary control valve 11 that also serves as the boom control valve.

As a result, the position of the spool of the auxiliary control valve 11 which also functions as the boom control valve becomes the switching position on the auxiliary hydraulic circuit side, and the hydraulic oil is supplied from the second hydraulic pump 1B to the boom driving hydraulic cylinder. The hydraulic oil from the second hydraulic pump 1B is stopped by this, and the auxiliary hydraulic circuit 104
Is supplied to the hydraulic fluid from the first hydraulic pump 1A and is arbitrarily distributed by the flow rate control valve mechanism 46.

As a result, the attachment control valve 13
The spool position of is the attachment lower position,
The hydraulic oil from the first hydraulic pump 1A and the second hydraulic pump 1B is supplied to one chamber of the attachment driving hydraulic cylinder device 34 via the oil passages 5, 31, 32. On the other hand, the hydraulic oil in the other chamber of the attachment-driving hydraulic cylinder device 34 passes through the oil passages 33 and 20 and flows into the reservoir tank 19.
Is discharged to As a result, the attachment driving hydraulic cylinder device 34 extends while the attachment 30
Is rotated downward as indicated by arrow a.

Further, the position of the spool of the movable actuating part control valve 12 becomes the movable actuating part raising position, and the working oil from the first hydraulic pump 1A and the second hydraulic pump 1B flows through the oil passages 5, 27 and 29. After that, it is supplied to one chamber of the hydraulic cylinder device 65 for driving the movable operation part. On the other hand, when the hydraulic oil in the other chamber of the hydraulic cylinder device 65 for driving the movable operating part is
It is discharged to the reservoir tank 19 through the oil passages 28 and 20. As a result, the movable operating portion 30a is rotated upward as shown by the arrow c while the movable operating portion driving hydraulic cylinder device 65 extends.

Therefore, in addition to the hydraulic oil from the first hydraulic pump 1A, the hydraulic oil from the second hydraulic pump 1B is supplied to the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65. Therefore, it is possible to secure a sufficient operation speed of the attachment 30 and the movable operation part 30a and improve the operation responsiveness.

On the contrary, in order to raise the attachment 30 and simultaneously lower the movable operating portion 30a (that is, drive it to the open side away from the claw portion 30b), the hydraulic cylinder device 34 for driving the attachment and the movable operation. The part drive hydraulic cylinder device 65 may be contracted at the same time. In this case, the attachment operation lever 24a and the movable operation part operation pedal 21 in the driving operation room 64
By operating a at the same time, the pilot oil pressure is applied to the attachment control valve 13 through the pilot oil passage 26, and the pilot oil pressure is applied to the movable operating part control valve 12 through the pilot oil passage 22.

At this time, the pilot oil passage 25 and the pilot oil passage 26 are connected to the pilot oil passage 38 via the shuttle valve 37. In this case, the pilot oil passage 2
Since the pilot hydraulic pressure of 6 is higher, the pilot hydraulic pressure is supplied from the pilot oil passage 26 to the pilot oil passage 38 by the action of the shuttle valve 37. Similarly, the pilot oil passage 22 and the pilot oil passage 23 are connected to the pilot oil passage 36 via the shuttle valve 35. In this case, the pilot oil pressure of the pilot oil passage 22 becomes larger, so the shuttle valve 35 By the action of, the pilot oil pressure is supplied from the pilot oil passage 22 to the pilot oil passage 38.

Further, since the pilot oil passage 38 and the pilot oil passage 36 are connected to each other via the pilot oil passage 42 and the shuttle valve 39, the operation of the shuttle valve 35 causes the pilot oil pressure and the pilot oil in the pilot oil passage 38 to be increased. The larger pilot oil pressure of the pilot oil pressures of the passage 36 is supplied to the pilot oil passage 42.
At this time, since the pilot hydraulic pressure for boom control is not supplied, the on / off control valve 41 is turned on, and the pilot hydraulic pressure is supplied as it is to the auxiliary control valve 11 that also serves as the boom control valve.

Therefore, the pilot oil pressure is applied to the attachment control valve 13 through the pilot oil passage 26, the pilot oil pressure is applied to the movable operating part control valve 12 through the pilot oil passage 22, and the pilot oil passage 38 or the pilot oil passage 38 is used. Through the oil passage 36 and the pilot oil passage 42, the pilot hydraulic pressure is also applied to the auxiliary control valve 11 that also serves as the boom control valve.

As a result, the position of the spool of the auxiliary control valve 11 that also functions as the boom control valve becomes the auxiliary hydraulic circuit side switching position, and the hydraulic oil is supplied from the second hydraulic pump 1B to the boom driving hydraulic cylinder. The hydraulic oil from the second hydraulic pump 1B is stopped by this, and the auxiliary hydraulic circuit 104
Is supplied to the side, is arbitrarily distributed by the flow control valve mechanism 46, and is added to the hydraulic oil from the first hydraulic pump 1A.

As a result, the attachment control valve 13
The spool position of is the attachment raising position,
The hydraulic oil from the first hydraulic pump 1A and the second hydraulic pump 1B is supplied to the other chamber of the attachment driving hydraulic cylinder device 34 via the oil passages 5, 31, 33. On the other hand, the hydraulic oil in one chamber of the attachment driving hydraulic cylinder device 34 passes through the oil passages 32 and 20 and flows into the reservoir tank 1.
It is discharged to 9. As a result, the attachment driving hydraulic cylinder device 34 contracts while the attachment 3
0 is rotated upward as indicated by arrow b.

Further, the position of the spool of the movable actuating part control valve 12 becomes the movable actuating part lowering position, and the working oil from the first hydraulic pump 1b and the second hydraulic pump 1a flows through the oil passages 5, 27, 28. After that, it is supplied to the other chamber of the hydraulic cylinder device 65 for driving the movable operation part. On the other hand, the hydraulic oil in one chamber of the hydraulic cylinder device 65 for driving the movable operating part is discharged to the reservoir tank 19 through the oil passages 29 and 20.
Thereby, the hydraulic cylinder device 65 for driving the movable operation part
While contracting, the movable operating portion 30a is rotated downward as indicated by the arrow d.

Therefore, in addition to the hydraulic oil from the first hydraulic pump 1A, the hydraulic oil from the second hydraulic pump 1B is supplied to the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65. Therefore, it is possible to secure a sufficient operation speed of the attachment 30 and the movable operation part 30a and improve the operation responsiveness.

In addition, the movable operating portion 30a is raised at the same time when the attachment 30 is raised (that is,
In the case of driving toward the claw portion 30b toward the closing side), the attachment 30 may be lowered at the same time as moving down the movable operating portion 30a (that is, driving toward the opening side away from the claw portion 30b). , A hydraulic cylinder device 34 for driving an attachment according to the same principle as the above-described operation example.
The hydraulic cylinder device 65 for driving the movable operating portion may be driven to expand and contract.

Of course, the operation lever 24a for the attachment and the operation pedal 2 for the movable operation part in the driving operation room 64
By operating 1a independently, the attachment 3
It is also possible to raise or lower the zero or the movable operating portion 30a. In this case, the attachment driving hydraulic cylinder device 34 or the movable operating part driving hydraulic cylinder device 65 may be extended / contracted as in the conventional case.

In this case as well, by the action of the auxiliary control valve 11 which also serves as the boom control valve, the hydraulic oil from the second hydraulic pump 1B is added to the hydraulic oil from the second hydraulic pump 1B in addition to the hydraulic oil from the first hydraulic pump 1A. Since it is supplied to the device 34 and the movable operating part driving hydraulic cylinder device 65, the operating speed of the attachment or the movable operating part can be controlled.

By the way, when the boom operation member (one of the working machine operation members) in the operation operation room 64 is operated,
The pilot oil pressure is supplied to the on / off control valve 41 through the boom control pilot oil passage 49, and the on / off control valve 41 is turned off. As a result, the pilot oil passage 42 is disconnected, and the pilot hydraulic pressure in the pilot oil passage 42 passes through the pilot oil passage 43.
It is discharged to 9. Further, the pilot hydraulic pressure is also supplied to the auxiliary control valve 11 that also functions as the boom control valve, the spool of the auxiliary control valve 11 is switched to the boom drive hydraulic cylinder supply position, and the operation from the second hydraulic pump 1B is performed. Oil will be supplied to other boom drive control valves and boom drive hydraulic cylinders.

In order to maintain the current states of the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65, the pilot hydraulic pressure is appropriately applied to the attachment control valve 13 and the movable operating part control valve 12. Then, the positions of the spools of the attachment control valve 13 and the movable actuating part control valve 12 may be set to the neutral position (hydraulic supply / discharge passage shutoff position). As a result, the supply and discharge of hydraulic oil from the attachment driving hydraulic cylinder device 34 and the movable operating portion driving hydraulic cylinder device 65 is stopped, and the attachment 34 and the movable operating portion 30a are held at their current positions. When the spool of the auxiliary control valve 11 is neutral, the control of the hydraulic oil from the second hydraulic pump 1B is not performed.

Thus, according to this embodiment,
In the case of performing the crushing work while adjusting the position of the target object 63 such as rock or concrete to be worked, conventionally, the attachment 30 and the movable working portion 30a are operated by the working oil supplied from one hydraulic pump 1A.
Of the hydraulic pump 1A, the hydraulic oil supplied from the other hydraulic pump 1B used to drive the work machine other than the attachment 30 and the movable operating portion 30a was added to the two hydraulic pumps 1A, By supplying the hydraulic oil supplied from 1B to the attachment driving hydraulic cylinder device 34 and the movable operating part driving hydraulic cylinder device 65, the hydraulic oil can be sufficiently supplied, and sufficient operation responsiveness is provided for both. To secure the operation speed, and especially to ensure sufficient hydraulic oil even when these are operated at the same time, to improve the drive speed of both, and to improve the operation responsiveness when the attachment 30 and the movable operation part 30a are operated at the same time. Can be done.

Next, the second embodiment will be described.
As shown in FIG. 3, the working machine control circuit of the working machine of this embodiment is different from that of the above-described first embodiment in an auxiliary hydraulic circuit (auxiliary fluid pressure circuit) 104. That is, in the present embodiment, the auxiliary hydraulic circuit 104 includes an oil passage 80, an oil passage (attachment control valve side auxiliary fluid pressure circuit portion) 81, an oil passage (movable actuation part control valve side auxiliary fluid pressure circuit portion) 82. When,
Switching control valve mechanism 9 interposed in these oil passages 81 and 82
0, and a check valve (check valve) 72.
The oil passage 80 is connected to the oil passage 4, and the second hydraulic pump 1
The hydraulic oil from B is sent. In addition, the oil passages 81 and 82
Is connected to the downstream side of the oil passage 80.

First, the switching control valve mechanism 90 performs switching control so that the hydraulic oil from the second hydraulic pump 1B is supplied to either the attachment control valve 13 side or the movable operation part control valve 12 side. Yes, it is constituted by on / off control valves (switching valves) 70, 71 interposed in oil passages 81, 82 of the auxiliary hydraulic circuit 104, respectively. These on / off control valves 70, 71 receive the pressure of the hydraulic oil supplied from the first hydraulic pump 1A to the attachment 30 or the attachment driving hydraulic cylinder 34, and the oil passages 81, 8
It is designed to perform 2 communication / interruption control.

Specifically, the on-side of the on / off control valve 70 and the off-side of the on / off control valve 71 are connected via an oil passage 83, and this oil passage 83 is further connected to an oil passage 82. ing. On the other hand, the off side of the on / off control valve 70 and the on side of the on / off control valve 71 are connected via an oil passage 84, and this oil passage 84 is further connected to an oil passage 81.

The hydraulic oil supplied from the first hydraulic pump 1A is supplied to the ON-side drive oil chamber (not shown) of the ON / OFF control valve 71 via the oil passage 81 and the oil passage 84b, and The oil is supplied to an off-side drive oil chamber (not shown) of the on / off control valve 70 via the oil passage 81 and the oil passage 84a. Further, the hydraulic oil supplied from the first hydraulic pump 1A is supplied to the off-side drive oil chamber (not shown) of the on / off control valve 71 via the oil passage 82 and the oil passage 83b, and also the oil passage 82. , Is supplied to an on-side drive oil chamber (not shown) of the on / off control valve 70 via the oil passage 83a.

In this way, the on / off control valves 70, 7
The hydraulic oil is supplied to each of the on-side and off-side oil chambers of No. 1 and the on / off control valve 7
The spools 0, 71 are pushed, and the spools of the on / off control valves 70, 71 are moved toward the side where the pressure of the supplied hydraulic oil is lower. That is, the on / off control valve 7
0 and 71 are from the first hydraulic pump 1A to the attachment 3
0 or the hydraulic fluid supplied to the attachment driving hydraulic cylinder 34 is switched so that the hydraulic fluid from the second hydraulic pump 1B is supplied to the higher pressure hydraulic fluid.

That is, from the first hydraulic pump 1A to the attachment 30 or the attachment driving hydraulic cylinder 34.
The situation in which the pressure supplied to the valve becomes high is a situation in which the load on these is increased, and one of the attachment 30 and the hydraulic cylinder 34 for driving the attachment that has a larger load is the hydraulic pressure of the hydraulic fluid to be supplied. This is because it can be considered that the higher the load and the higher the supplied hydraulic pressure, the more hydraulic oil is required.

Therefore, for example, when the pressure supplied from the first hydraulic pump 1A to the movable operating part driving hydraulic cylinder 65 is higher (that is, when the pressure in the oil passage 82 is higher), the on / off control is performed. The valve 71 is switched to the off side and the oil passage 81 is shut off, while the on / off control valve 70 is switched to the on side and the oil passage 82 is communicated with the first hydraulic pump 1A.
In addition to the hydraulic oil from the second hydraulic pump 1B, the hydraulic oil from the second hydraulic pump 1B is supplied to the movable operating portion driving hydraulic cylinder 65, so that a sufficient operating speed of the movable operating portion 30a is ensured and the steering response is improved. Can be improved.

On the other hand, when the pressure supplied from the first hydraulic pump 1A to the attachment driving hydraulic cylinder 34 is higher (that is, when the pressure in the oil passage 81 is higher), the on / off control valve 70 is turned off. While the oil passage 82 is shut off and the on / off control valve 71 is switched to the on side so that the oil passage 81 is communicated, the operation oil from the second hydraulic pump 1B is added to the hydraulic oil from the first hydraulic pump 1A. Since the oil is supplied to the attachment driving hydraulic cylinder 34, a sufficient operating speed of the attachment 30 can be secured and the operation response can be improved.

By the way, the check valve 7 is provided upstream of the on / off control valves 70 and 71 provided in the auxiliary hydraulic circuit 104.
2 are provided. The check valve 72 communicates the hydraulic fluid from the second hydraulic pump 1B, while the first hydraulic pump 1
The hydraulic oil from A is cut off to prevent the hydraulic oil from the first hydraulic pump 1A from flowing into the upstream side of the auxiliary hydraulic circuit 104.

The rest of the construction of the working machine control circuit of the working machine of this embodiment is the same as that of the first embodiment described above, so a description thereof will be omitted here. Further, the auxiliary hydraulic circuit 104 in the work machine control circuit of the work machine of the present embodiment may be attached as an external pipe. Since the work machine control circuit of the work machine according to the present embodiment is configured in this way, the attachment 30 and the movable operation portion 30a can be operated in the same manner as in the first embodiment described above, At this time, the hydraulic oil supplied to the auxiliary hydraulic circuit 104 by the second hydraulic pump 1B is moved by the ON / OFF control valves 70 and 71 as the switching control valve mechanism 90 to the movable operating part driving hydraulic cylinder 65 or the attachment driving hydraulic cylinder. Three
The second hydraulic pump 1A only for the one out of 4
The hydraulic oil from is added.

In this way, according to the present embodiment, as in the case of the above-described first embodiment, in the case where the crushing work is performed while the position of the target object 63 such as rock or concrete to be worked is adjusted. Conventionally, the attachment 30 and the movable operation part 30a were driven by the hydraulic oil supplied from one hydraulic pump 1A, but it is used to drive a work machine other than the attachment 30 and the movable operation part 30a. Other hydraulic pumps that had
Adding hydraulic oil supplied from B, two hydraulic pumps 1
By supplying the hydraulic oil supplied from A and 1B to the attachment driving hydraulic cylinder device 34 or the movable operating part driving hydraulic cylinder device 65, the hydraulic oil can be supplied to the cylinder device that does not have sufficient hydraulic oil during simultaneous operation. Can be sufficiently supplied, the drive speed of both can be improved, sufficient operation responsiveness can be secured for both, and the operation responsiveness when the attachment 30 and the movable operation portion 30a are operated simultaneously can be improved. Of.

In the above embodiment, the present invention is configured to operate using hydraulic pressure, but it is of course possible to configure to operate using other fluid pressure. Further, the present invention is applicable not only to construction machines such as hydraulic excavators, but also to various working machines.

Further, in the above embodiment, the auxiliary control valve is also used as the boom control valve 11, but the auxiliary control valve may be provided separately, and the auxiliary fluid pressure circuit may be configured as an external piping circuit. For example, it is convenient for improving conventional models.

[0082]

As described in detail above, according to the working machine control circuit of the working machine of the present invention (claims 1 to 9), the actuator for driving the attachment, the actuator for driving the movable operating portion, and the actuator for driving the attachment. And a first fluid pressure pump for pressurizing a pressure working fluid for driving a movable operating part driving actuator, an attachment control valve, a movable operating part control valve, a working machine actuator, and a working machine actuator Second fluid pressure pump for pressurizing the working fluid of pressure, a working machine main fluid pressure circuit having at least a working machine control valve, a pilot pump, a control valve for attachment of control pressure fluid from the pilot pump, and a movable Working machine operation member is interlocked to control the supply state to the control valve for operating part and the control valve for working machine In a work machine control circuit of a work machine having a work machine pilot fluid pressure circuit having at least a plurality of pilot control valves, the pressure actuating fluid from the second fluid pressure pump is used for the attachment driving actuator and movable operation. An auxiliary fluid pressure circuit capable of supplying to the site driving actuator is provided, and the supply state of the pressure working fluid from the second fluid pressure pump to the attachment control valve side and / or the movable operation site control valve side is set. An auxiliary control valve provided with a control valve mechanism interposed in the auxiliary fluid pressure circuit for controlling, and further controlled to supply the pressure working fluid from the second fluid pressure pump to the auxiliary fluid pressure circuit side. Is provided, in addition to the supply of the pressure working fluid from the first fluid pressure pump when simultaneously driving the attachment and the movable working part, It is possible to receive the supply of the pressure working fluid from the two-fluid pressure pump, so that when the attachment and the movable working part are simultaneously driven, the pressure working fluid necessary for both can be sufficiently secured, and as a result, the attachment. Also, since it is possible to secure a sufficient working speed for both when driving the movable operating part and the movable operating part at the same time, the work proceeds smoothly when the attachment and the movable operating part are driven at the same time and the position is adjusted to perform the crushing work. Therefore, there is an advantage that the operation response can be improved.

Further, since the working machine control valve also serves as the auxiliary control valve, it is possible to use the conventionally provided working machine control valve, and the auxiliary fluid pressure circuit is configured as an external piping circuit. Therefore, it is possible to easily improve the conventional working machine, and it is possible to obtain an effect that the working value is extremely high. In particular, by configuring the circuit as claimed in claims 3, 8 and 9, the fluid pressure can be distributed according to the degree to which the fluid pressure is required. Therefore, the working machine can be efficiently utilized. Can be operated more efficiently and with a good work balance.

[Brief description of drawings]

FIG. 1 is a control hydraulic circuit diagram for explaining a configuration of a work machine control circuit of a work machine as a first embodiment of the present invention.

FIG. 2 is a view for explaining another configuration example of the flow rate control valve mechanism according to the first embodiment of the present invention, and is a view corresponding to a portion A in FIG. 1.

FIG. 3 is a control hydraulic circuit diagram for explaining a configuration of a work machine control circuit of a work machine as a second embodiment of the present invention.

FIG. 4 is a control hydraulic circuit diagram for explaining a configuration of a work machine control circuit of a conventional work machine.

FIG. 5 is a schematic side view showing a construction machine such as a hydraulic excavator when an attachment is attached.

[Explanation of symbols]

1A 1st hydraulic pump (1st fluid pressure pump) 1B 2nd hydraulic pump (2nd fluid pressure pump) 2 Pilot pump 3 Control unit 4 Oil passage 5 Oil passage 6 Straight traveling control valve 7 Left traveling motor control valve 8 Control valve for right traveling motor 9 Control valve for swing motor 10 Control valve for stick 11 Control valve for boom (auxiliary control valve that also serves as control valve for boom) 12 Control valve for movable operation part 13 Control valve for attachment 19 Reservoir tank 21 Movable operating part operating device 21a Movable operating part operating pedal 22, 23, 25, 26, 36, 38, 42, 49 Pilot oil passage 24 Attachment operating device 24a Attachment operating lever 30 Attachment 30a Movable operating part 30b Movable operating Part claws 30c, 51A, 54A pin 34 Attachmen Drive hydraulic cylinder (actuator for attachment drive) 35, 37, 39 Shuttle valve 41 On / off control valve 46 Flow control valve mechanism (control valve mechanism) 46a, 46b Flow control orifice 50 Construction machine body (work machine body) 52 Boom Hydraulic cylinder for driving (one of actuators for driving working machine) 58, 59 Rod 61 Lower traveling body 63 Target object 64 Driving operation room 65 Hydraulic cylinder for driving movable operation site (actuator for driving movable operation site) 70, 71 ON / OFF control valve (Switching valve) 72 Check valve (check valve) 80, 83, 83a, 83b, 84, 84a, 84b
Oil passage 81 Oil passage (attachment control valve side auxiliary fluid pressure circuit section) 82 Oil passage (movable actuation part control valve side auxiliary fluid pressure circuit section) 90 Switching control valve mechanism (control valve mechanism) 101 Working machine hydraulic circuit (Main fluid pressure circuit for working machine) 102 First circuit section 103 Second circuit section 104 Auxiliary hydraulic circuit (auxiliary fluid pressure circuit) 105 Pilot hydraulic circuit for attachment (Pilot fluid pressure circuit for attachment) 106 Pilot hydraulic pressure for movable working part Circuit (pilot fluid pressure circuit for movable operation part) 107 Second pilot hydraulic circuit 108 First pilot hydraulic circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Kubo 7-14 Wadamiyadori, Hyogo-ku, Kobe, Hyogo Prefecture Nishiryo Engineering Co., Ltd.

Claims (9)

[Claims] 1. A work machine equipped with a movable attachment having a movable operation portion, which is attached to an arm so as to be changeable in posture, and an attachment driving actuator for driving the attachment, and the movable operation of the attachment. A movable operating part driving actuator for driving a part, a first fluid pressure pump for pressurizing a pressure working fluid for driving the attachment driving actuator and the movable operating part driving actuator, and the first fluid pressure An attachment control valve that controls the supply state of the pressure working fluid from the pump to the attachment driving actuator, and a movable control valve that controls the supply state of the pressure working fluid from the first fluid pressure pump to the movable working portion driving actuator. With a control valve for the operating part In addition, a working machine driving actuator for driving a working machine other than the above-mentioned attachment and movable working part, and a second fluid pressure pump for pressurizing a pressure working fluid for driving the working machine driving actuator, A working machine main fluid pressure circuit having at least a working machine control valve for controlling a supply state of a pressure working fluid from the second fluid pressure pump to the working machine actuator is provided, and a control pressure fluid is generated. Operate the pilot pump and the attachment and the movable working part in order to control the supply state of the control pressure fluid from the pilot pump to the attachment control valve, the movable working part control valve and the working machine control valve. Pilot for a working machine having at least a plurality of pilot control valves interlocking with a working machine operating member including an operating member for A fluid pressure circuit is provided, and the pressure working fluid from the second fluid pressure pump is supplied to the attachment driving actuator and the movable working portion driving actuator via the attachment control valve and the movable working portion control valve. And an auxiliary fluid pressure circuit for controlling the supply state of the pressure working fluid from the second fluid pressure pump to the attachment control valve side and / or the movable operation part control valve side. The pressure control fluid from the second fluid pressure pump is supplied to the auxiliary fluid pressure circuit side by the control valve mechanism interposed and the pilot control valve that interlocks with the attachment and the operation member for operating the movable operation portion. A work machine control circuit for a work machine, comprising: an auxiliary control valve that is controlled to operate. 2. A flow control valve mechanism, wherein the control valve mechanism controls a flow rate to distribute the pressure working fluid from the second fluid pressure pump to the attachment control valve side and the movable operation part control valve side. The working machine control circuit for a working machine according to claim 1, wherein the working machine control circuit is configured as follows. 3. A switching control in which the control valve mechanism performs switching control to supply the pressure working fluid from the second fluid pressure pump to either the attachment control valve side or the movable operation part control valve side. The working machine control circuit of the working machine according to claim 1, wherein the working machine control circuit is configured as a valve mechanism. 4. The work machine control valve also serves as the auxiliary control valve, and the work machine control valve is provided with a pilot control valve that is interlocked with the attachment and the operation member for operating the movable operation part. By supplying the pressure working fluid from the second fluid pressure pump to the working machine actuator, the pressure working fluid from the second fluid pressure pump is supplied to the auxiliary fluid pressure circuit side. A working machine control circuit for a working machine according to any one of claims 1 to 3, wherein 5. A pilot fluid pressure circuit for a working machine, a first pilot fluid pressure circuit for the control valve for a working machine, which also serves as the auxiliary control valve, the control valve for an attachment, and the control for a movable operating part. A second pilot fluid pressure circuit for the valve, the first pilot fluid pressure circuit and the second pilot fluid pressure circuit being connected via a shuttle valve. Work machine control circuit of the described work machine. 6. The working machine control circuit for a working machine according to claim 1, wherein the auxiliary fluid pressure circuit is configured as an external piping circuit. 7. The flow rate control valve mechanism comprises flow rate control orifices respectively provided in the attachment control valve side auxiliary fluid pressure circuit section and the movable operation part control valve side auxiliary fluid pressure circuit section. The work machine control circuit for a work machine according to claim 2, wherein the work machine control circuit is provided. 8. The switching control valve mechanism is configured as a switching valve interposed in the attachment control valve side auxiliary fluid pressure circuit section and the movable operation site control valve side auxiliary fluid pressure circuit section, respectively, and the switching valve The valve is configured to be switched by the pressure of a pressure working fluid supplied from the first fluid pressure pump to the attachment control valve side and the movable operation part control valve side. The working machine control circuit of the working machine described in 3. 9. The work machine control circuit for a work machine according to claim 8, wherein the auxiliary fluid pressure circuit includes a check valve upstream of the switching valve.