JP5901015B2 - Hydraulic work machine - Google Patents

Description

  The present invention relates to a technical field of a hydraulic working machine such as a hydraulic excavator.

In general, a hydraulic working machine such as a hydraulic excavator is provided with various hydraulic actuators for driving a working unit and a traveling unit. For example, a hydraulic excavator is used as a valve unit for controlling the operation of the hydraulic actuator. Then, a pilot-actuated control valve that performs oil supply / discharge control on the hydraulic actuator and a pilot that outputs pilot pressure to the control valve based on the operation of an operation tool (operation lever or operation pedal) disposed in the cab. Valves are widely used.
By the way, when a hydraulic working machine such as a hydraulic excavator is operated at a disaster occurrence site or the like where safety cannot be ensured, it may be configured to be remotely operated using a radio signal. In this case, it is required that the hydraulic work machine can be operated by any of the boarding operation and the remote operation in which the operator gets on and operates the hydraulic work machine. Therefore, in the hydraulic work machine using the control valve and the pilot valve as described above, an electromagnetic valve that operates by an electrical signal output based on a remote operation and outputs a pilot pressure, and an output from the electromagnetic valve. Equipped with a shuttle valve that selects the high pressure side of the pilot pressure output from the pilot valve and the pilot pressure output from the pilot valve and outputs it to the control valve. However, in this case, when the solenoid valve and the shuttle valve are arranged in the cab, a space for arranging these valves and a hydraulic hose for connecting the valves to each other must be secured in the cab. There is a problem that the installation space of other devices in the minute operation room and the living space of the operator become narrow.
Therefore, conventionally, a hydraulic signal output device in which a pilot valve, a solenoid valve, and a shuttle valve are integrally incorporated is formed, and the hydraulic signal output device is built in a console (lever stand) to which an operation lever is attached. There is known a technique capable of reducing the mounting space for hydraulic equipment in the cab (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2002-221201

  By the way, for example, when there is an emergency request from a disaster area, a standard hydraulic work machine that cannot be operated by remote operation may be changed to a remote operation compatible specification that can be operated by remote operation. In such a case, in Patent Document 1, after removing the console, the pilot valve incorporated for the standard specification is removed, the above-described hydraulic signal output device is incorporated, and then the console is attached to the cab again. Therefore, it takes time to remove and install the console to change the specifications. Furthermore, for example, in a hydraulic excavator, pilot valves are provided in the left and right consoles corresponding to the left and right operation levers, respectively, and pilot valves are provided respectively below the floor of the cab corresponding to the left and right traveling pedals. Therefore, it is necessary to replace these four pilot valves with hydraulic signal output devices, and there is a problem that it takes more time to change the specifications. In addition, since the hydraulic hose must be removed from the pilot valve in the cab and connected to the hydraulic signal output device, there is a problem that oil leaks into the cab. Furthermore, when the hydraulic signal output device fails, there is a risk of oil leakage in the cab, and when performing maintenance such as repair or inspection of the hydraulic signal output device, the console must be removed and installed. There is also a problem that the maintenance work takes time, and there are problems to be solved by the present invention.

SUMMARY OF THE INVENTION The present invention was created in view of the above-described circumstances to solve these problems. The invention of claim 1 is a hydraulic actuator and a pilot that performs oil supply / discharge control for the hydraulic actuator. A hydraulic working machine comprising an actuated control valve and a pilot valve that operates by operation of an operating tool arranged in a cab and outputs pilot pressure to the control valve. In the configuration that can be changed between a standard specification that cannot be operated by operation and a remote operation compatible specification that can be operated by remote operation, in the standard specification, the operation detection for guiding the pilot pressure output from the pilot valve to the pilot pressure detection means the operation detection valve block use valve is incorporated is provided, the the manipulation sensing valve block While disposed below the cab floor in a freely state removable from the hydraulic pipe connected to the hydraulic pipes, and a control valve connected to the pilot valve, the remote control corresponding specifications, based on the remote control output A solenoid valve that operates in response to an electrical signal to output a pilot pressure, and selects a high pressure side from among a pilot pressure output from the solenoid valve and a pilot pressure output from the pilot valve, and outputs the selected control valve to the control valve A remote control valve block in which a shuttle valve that operates and an operation detection valve for guiding a pilot pressure output from an electromagnetic valve or a pilot valve to a pilot pressure detection means are integrated, and the remote operation valve the block, in place of the operation detection valve block provided by the standard, against the pilot valve Hydraulic pipe to be, and a hydraulic working machine, characterized in that disposed below the connected to hydraulic pipe cab floor surface to be connected to the control valve was.

  With the invention of claim 1, when changing from the standard specification to the specification for remote operation, a simple operation of removing the operation detection valve block and installing the remote operation valve block below the floor of the cab The specification can be changed by this, which can greatly contribute to the simplification and time reduction of the specification changing work. Furthermore, in this case, the hydraulic piping removed from the operation detection valve block may be connected to the remote control valve block as it is, so there is no change or addition of the hydraulic piping, and the hydraulic piping is removed or connected in the cab. Since it is performed below the floor surface, the possibility of oil leaking into the cab can be reliably avoided. In addition, it is not necessary to secure the space for installing the solenoid valve and shuttle valve in the driver's room where there is not enough space. There is no possibility that various apparatus devices will interfere with the work, and there is no possibility of oil leaking into the cab, which can greatly contribute to the improvement of the workability of the maintenance work.

It is a side view of a hydraulic excavator. It is an operation system hydraulic circuit diagram of standard specifications. FIG. 3 is an operation system hydraulic circuit diagram of a remote operation compatible specification. It is a figure which shows the attachment state of the valve block for remote control.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a hydraulic excavator which is an example of a hydraulic working machine. The hydraulic excavator 1 includes a crawler type traveling body 2 and an upper revolving body 3 which is rotatably supported above the traveling body 2. The front working unit 4 is mounted on the upper swing body 3, and the front working unit 4 includes a boom 5, an arm 6, a bucket 7, and the like. The left and right traveling motors (not shown) for driving the traveling body 2, the turning motor (not shown) for turning the upper turning body 3, the boom 5, the arm 6, and the bucket 7 are moved up and down, respectively. Various hydraulic actuators such as a boom cylinder 8, an arm cylinder 9, and a bucket cylinder 10 for swinging are provided.

  Reference numeral 11 denotes a driver's cab provided in the upper swing body 3, and a driver's seat 12 on which an operator sits is disposed in the operator's cab 1, and the boom cylinder 8, the arm cylinder 9, Left and right operation levers 13 are provided as operation tools for driving the bucket cylinder 10 and the turning motor, and left and right travel operation tools 14 (travel operation) as operation tools for driving the traveling body 2. A lever 14a and a traveling pedal 14b) are provided. The left and right operating levers 13 are joystick levers that can operate two hydraulic actuators by swinging back and forth and left and right. In the present embodiment, the left operating lever 13 includes the boom cylinder 8 and the bucket. The operation lever 13 on the right side is set for operating the cylinder 10 and the swinging motor for operating the cylinder 10 and the turning motor.

  The left and right operation levers 13 are respectively attached to and supported by left and right consoles 15 disposed on the left and right sides of the driver's seat 12, and the left and right consoles 15 are based on the operation of the left and right operation levers 13. Operated boom, bucket, arm, and turn pilot valves 16A, 16B to 19A, 19B are provided. In the present embodiment, the left console 15 is equipped with a boom pilot valve 16A, 16B and a bucket pilot valve 17A, 17B that are integrally assembled and unitized. Further, the right console 15 includes arm pilot valves 18A and 18B and swivel pilot valves 19A and 19B which are integrally assembled and unitized. The hydraulic hose 22 connected to the boom, bucket, arm, and swivel pilot valves 16A, 16B to 19A, 19B is pulled out from below the console 15 and penetrates the floor surface 23 of the cab 11. It is connected to an operation detection valve block 24 or a remote operation valve block 25, which will be described later, disposed below the floor surface 23 of the cab 11 (see FIG. 1 for remote operation). The valve block 25 is shown).

  The left and right traveling operation tools 14 are attached to and supported by the floor 23 of the cab 11, and the left and right traveling operation tools 14 are operated under the left and right traveling operation tools 14. The left and right traveling pilot valves 20 </ b> A, 20 </ b> B, 21 </ b> A, 21 </ b> B that operate based on the above are arranged in a state of projecting below the floor surface 23 of the cab 11. The hydraulic hose 26 connected to the left and right traveling pilot valves 20A, 20B, 21A, and 21B extends rearward below the floor surface 23 of the cab 11 and is connected to the operation detection valve block 24 or the remote control. It is connected to the operation valve block 25.

  Here, the hydraulic excavator 1 can be changed to a standard specification in which the hydraulic excavator 1 cannot be operated by remote operation and a remote operation compatible specification in which the hydraulic excavator 1 can be operated by remote operation. In the case of the standard specification, an operation detection valve block 24 is disposed below the floor 23 of the cab 11, while in the case of the specification for remote operation, the operation detection valve block 24 is replaced. A remote operation valve block 25 is arranged.

  Next, an operation system hydraulic circuit of the standard type hydraulic excavator 1 will be described with reference to the hydraulic circuit diagram of FIG. In FIG. 2, 16A, 16B to 21A, 21B are pilot valves for the boom, bucket, arm, turning, left and right traveling, 24 is a valve block for detecting operation, 28 is a pilot hydraulic pressure source, 29 is An oil tank 30 is a control valve unit.

  The control valve unit 30 includes a boom cylinder 8, a bucket cylinder 10, an arm cylinder 9, a swing motor, and a pilot-actuated boom, bucket, arm, and swivel that perform oil supply / discharge control for the left and right traveling motors, respectively. The left and right traveling control valves 31 to 36 are integrally assembled, and the control valve unit 30 is housed in a device housing room 37 provided behind the cab 11.

  Further, the pilot valves 16A, 16B to 21A, 21B for the boom, bucket, arm, turning, and left and right traveling use the left and right operation levers 13 and the left and right traveling operation tools 14 as described above. The pilot pressure is output to the control valves 31 to 36 for the boom, bucket, arm, turning, and left and right traveling. The pilot pressures output from the boom, bucket, arm, swivel, and left and right traveling pilot valves 16A, 16B to 21A, and 21B are used for the boom, bucket, arm, swivel, left and right. The control valves 31 to 36 are actuated by being input to the travel control valves 31 to 36, and oil supply to the boom cylinder 8, the bucket cylinder 10, the arm cylinder 9, the swing motor, and the left and right travel motors is performed. Each exhaust control is performed.

  On the other hand, the operation detection valve block 24 is arranged in the middle of the pilot oil passage from the pilot valves 16A, 16B to 21A, 21B to the control valves 31 to 36. A plurality of operation detection shuttle valves (corresponding to operation detection valves for guiding the pilot pressure output from the pilot valve of the present invention to the pilot pressure detection means) 38 are integrally incorporated. These operation detection shuttle valves 38 select the highest pressure among the pilot pressures output from the pilot valves 16A, 16B to 21A, 21B and guide it to a pressure switch 39 (corresponding to the pilot pressure detection means of the present invention). The pressure switch 39 detects the pilot pressure output from the pilot valves 16A, 16B to 21A, 21B. In this embodiment, the pressure switch 39 for detecting the pilot pressure output from the pilot valve 16A, 16B to 19A, 19B for the boom, bucket, arm, and turning, the pilot valve 20A for left travel, There are provided three pressure switches 39, a pressure switch 39 for detecting the output of the pilot pressure from 20B and a pressure switch 39 for detecting the output of the pilot pressure from the right travel pilot valves 21A, 21B. The detection signal of the pressure switch 39 is input to a controller (not shown) and used for control of engine auto-decel and parking brake.

  Here, as described above, the operation detection valve block 24 is disposed below the floor surface 23 of the cab 11, and the operation detection valve block 24 and the boom, bucket, arm, swivel The pilot valves 16A, 16B to 19A, 19B are connected via a hydraulic hose 22, and the operation detection valve block 24 and the left and right traveling pilot valves 20A, 20B, 21A, 21B are hydraulic hoses. 26 is connected. Further, the operation detection valve block 24 and the control valve unit 30 are connected via a hydraulic hose 40 disposed from below the floor surface 23 of the cab 11 to the equipment storage chamber 37.

  Next, the operation system hydraulic circuit of the hydraulic excavator 1 for remote operation will be described with reference to the hydraulic circuit diagram of FIG. 3. In FIG. 3, the boom, bucket, arm, turning, and left and right traveling Pilot valves 16A, 16B to 21A, 21B, pilot hydraulic power source 28, oil tank 29, control valve unit 30, and boom, bucket, arm, swivel, left and right traveling for incorporation into the control valve unit 30 Since the control valves 31 to 36 are the same as the standard specification described above, the description thereof is omitted.

  Further, in FIG. 3, reference numeral 25 denotes a remote operation valve block. The remote operation valve block 25 includes boom, bucket, arm, turning, left and right traveling solenoid valves 41A, 41B˜. 46A, 46B, boom valves, buckets, arms, swiveling, left and right traveling shuttle valves 47A, 47B to 52A, 52B, and a plurality of operation detecting shuttle valves 53 are integrally incorporated. .

  The boom, bucket, arm, swivel, left and right traveling solenoid valves 41A, 41B to 46A, 46B are wirelessly transmitted from the remote control tool when a remote control tool (not shown) is operated. It operates by an electrical signal output from a remote control controller (not shown, but mounted on a remote control compatible hydraulic excavator 1) that has received the transmitted operation command, and outputs a pilot pressure.

  The boom, bucket, arm, turning, left and right traveling shuttle valves 47A, 47B to 52A, 52B are boom, bucket, arm, turning, left and right traveling pilots. Pilot pressure output from the valves 16A, 16B to 21A, 21B and pilot pressure output from the solenoid valves 41A, 41B to 46A, 46B for boom, bucket, arm, turning, and left and right traveling The high pressure side is selected and output to the control valves 31 to 36 for boom, bucket, arm, turning, and left and right traveling (for example, boom shuttle valves 47A and 47B are pilots for boom). Select the high pressure side from the pilot pressure output from the valves 16A and 16B and the pilot pressure output from the boom solenoid valves 41A and 41B. Te, and outputs it to the boom control valve 31). Thus, when the pilot pressure is output from the pilot valves 16A, 16B to 21A, 21B by operating the left / right operation lever 13 or the left / right traveling operation tool 14, the pilot pressure is applied to the shuttle valves 47A, 47B. When the pilot pressure is output from the solenoid valves 41A, 41B to 46A, 46B while the remote control tool is operated while being selected by -52A, 52B and input to the control valves 31-36, the pilot pressure is The shuttle valves 47A, 47B to 52A and 52B are selected and input to the control valves 31 to 36, whereby the operator gets into the operator's cab 11 for left and right operation levers 13 or left and right traveling. What is the boarding operation for operating the operation tool 14 and the remote operation for operating the operation tool 14 by using a radio signal? It has to be able to steer the hydraulic excavator 1 in the operation.

  Further, a plurality of operation detection shuttle valves incorporated in the remote operation valve block 25 (corresponding to operation detection valves for guiding the pilot pressure output from the solenoid valve or pilot valve of the present invention to the pilot pressure detection means). ) 53 is for selecting the highest pressure among the pilot pressures output from the pilot valves 16A, 16B to 21A, 21B or the solenoid valves 41A, 41B to 46A, 46B and leading them to the pressure switch 39. The switch 39 detects the pilot pressure output from the pilot valves 16A, 16B to 21A, 21B and the electromagnetic valves 41A, 41B to 46A, 46B. The pressure switch 39 is the same as the pressure switch 39 provided as a standard specification, and is provided with three convenient ones. The detection signal of the pressure switch 39 is input to the controller, and the engine auto-decel And parking brake control.

  The remote operation valve block 25 removes the operation detection valve block 24 provided in the standard specification when the hydraulic excavator 1 is changed from the standard specification to the remote operation compatible specification. It replaces with 24 and is attached to the lower side of the floor 23 of the cab 11 via the bracket 27. At this time, by removing the hydraulic hoses 22, 26, 40 from the operation detection valve block 24 and connecting the hydraulic hoses 22, 26, 40 to the remote operation valve block 25, the remote operation valve block 25 and the boom The pilot valves 16A, 16B to 21A, 21B for bucket, arm, turning, and left and right traveling are connected via hydraulic hoses 22, 26, and the remote operation valve block 25 and the control valve unit 30 are connected. Is connected via a hydraulic hose 40.

  Here, the mounting state of the remote control valve block 25 is shown in FIG. 4, and in FIG. 4 and FIG. 1, reference numeral 54 denotes a cab mounting portion formed on the gantry frame (swing frame) of the upper swing body 3. The cab 11 is mounted and supported on the upper side of the cab mounting portion 54 via a mount (not shown). The remote control valve block 25 is attached to the lower side of the floor 23 of the cab 11 via the bracket 27 as described above. This can be performed from the lower side of the mounting portion 54 or by removing the under cover (guard) 55. In FIG. 1 and FIG. 4, electrical wiring connected to the solenoid valves 41 </ b> A, 41 </ b> B to 46 </ b> A, 46 </ b> B and the pressure switch 39 is omitted. In the case of the standard specification, an operation detection valve block 24 is attached instead of the remote operation valve block 25. The operation detection valve block 24 is mounted in the remote operation valve block 25. It is the same.

  In the present embodiment configured as described, the hydraulic excavator 1 includes various hydraulic actuators (in this embodiment, a boom cylinder 8, an arm cylinder 9, a bucket cylinder 10, a swing motor, and a traveling motor) and oils for these hydraulic actuators. By operating pilot-operated control valves 31 to 36 that perform supply / discharge control and operating tools (in this embodiment, the left and right operating levers 13 and the left and right traveling operating tools 14) disposed in the cab 11. Pilot valves 16A, 16B to 21A, 21B that operate to output pilot pressure to the control valves 31 to 36 are provided, and the hydraulic excavator 1 is controlled by a remote control and a standard specification that cannot be operated by a remote control. It can be changed to a remote operation compatible specification that can be An operation detection valve in which an operation detection shuttle valve 38 for guiding the pilot pressure output from the pilot valves 16A, 16B to 21A, 21B to the pressure switch 39 is incorporated below the floor surface 23 of the cab 11. On the other hand, in the remote operation specification, the block 24 is disposed, and instead of the operation detection valve block 24, the operation is performed below the floor surface 23 of the cab 11 by an electric signal output based on the remote operation. Solenoid valves 41A, 41B to 46A, 46B for outputting pilot pressure, pilot pressures output from the solenoid valves 41A, 41B to 46A, 46B, and pilot pressures output from the pilot valves 16A, 16B to 21A, 21B Shuttle valves 47A, 47B-52 that select the high pressure side and output to the control valves 31-36 , 52B and an operation detection shuttle valve 53 for guiding the pilot pressure output from the solenoid valves 41A, 41B to 46A, 46B or the pilot valves 16A, 16B to 21A, 21B to the pressure sensor 39 are integrally incorporated. In addition, a remote control valve block 25 is provided.

  Thus, when changing from the standard specification to the remote operation compatible specification, the operation detection valve block 24 disposed below the floor 23 of the cab 11 is removed and replaced with the operation detection valve block 24. By attaching the remote operation valve block 25, the electromagnetic valves 41A, 41B to 46A, 46B and the shuttle valves 47A, 47B to 52A, 52B, which are valves necessary for remote operation, are incorporated into the operation detection valve block 24. The operation detection shuttle valve 53 that functions in the same manner as the operation detection shuttle valve 38 is disposed below the cab 11 in a state of being integrated into the remote operation valve block 25. Become.

  As a result, the specification can be changed from the standard specification to the specification for remote operation by a simple operation of removing the operation detection valve block 24 and attaching the remote operation valve block 25 below the floor 23 of the cab 11. , Can greatly contribute to facilitating specification change work and shortening time Further, in this case, the hydraulic detection hoses 22 and 26 for connecting the operation detection valve block 24 and the pilot valves 16A, 16B to 21A and 21B, and the operation detection valve block 24 and the control valve unit 30 in the standard specification. The hydraulic hose 40 to be connected is connected to the remote control valve block 25 and the pilot valves 16A, 16B to 21A and 21B, and the hydraulic hose 22 and 26 is connected to the remote control valve block 25 and the control valve unit 30. Since it can be used as it is as the hose 40, there is no change or addition of the hydraulic hose, and the removal and connection work of the hydraulic hoses 22, 26, 40 is performed below the floor surface 23 of the cab 11. The possibility of oil leaking into the cab 11 can be reliably avoided. .

  Further, in this case, the space required for the solenoid valves 41A, 41B to 46A, 46B and the shuttle valves 47A, 47B to 52A, 52B, which are valves necessary for remote control, is secured in the cab 11 where there is not enough space. In addition, when performing maintenance such as inspection and repair, there is no possibility that other various devices and equipments may interfere with work as in the case where the operation room 11 is provided. There is no risk of oil leaking, and it can greatly contribute to improving the workability of maintenance work.

  The present invention is used when a hydraulic work machine such as a hydraulic excavator is configured to be changeable between a standard specification in which the hydraulic work machine cannot be steered by remote operation and a specification for remote operation that can be steered by remote operation. Can do.

DESCRIPTION OF SYMBOLS 11 Driver's cab 13 Operation lever 14 Traveling operation tool 16A, 16B-21A, 21B Pilot valve 22 Hydraulic hose 23 Floor 24 Operation detection valve block 25 Remote operation valve block 26 Hydraulic hose 31-36 Control valve 38 Operation detection Shuttle valve 39 Pressure switch 40 Hydraulic hose 41-46 Solenoid valve 47-52 Shuttle valve 53 Shutdown valve for operation detection

Claims (1)

A hydraulic actuator, a pilot-actuated control valve that performs oil supply / discharge control on the hydraulic actuator, and a pilot valve that operates by operating an operation tool disposed in a cab and outputs pilot pressure to the control valve. In the hydraulic working machine
In configuring the hydraulic work machine so that it can be changed to a standard specification that cannot be operated by remote operation and a remote operation compatible specification that can be operated by remote operation,
In the standard specification, an operation detection valve block incorporating an operation detection valve for guiding the pilot pressure output from the pilot valve to the pilot pressure detection means is provided, and the operation detection valve block is connected to the pilot valve. While being disposed below the cab floor surface in a detachable manner with respect to the hydraulic piping and the hydraulic piping connected to the control valve ,
In the remote operation compatible specification, an electromagnetic valve that operates by an electrical signal output based on remote operation and outputs a pilot pressure, a pilot pressure output from the electromagnetic valve, and a pilot pressure output from the pilot valve A remote control in which a shuttle valve for selecting the high pressure side and outputting it to the control valve and an operation detection valve for guiding the pilot pressure output from the solenoid valve or pilot valve to the pilot pressure detecting means are integrated. An operation valve block is provided, and the remote operation valve block is replaced with a hydraulic pipe connected to the pilot valve and a hydraulic pipe connected to the control valve in place of the operation detection valve block provided in the standard specification. A hydraulic working machine characterized in that it is connected and disposed below the cab floor.

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