JP2005082265A - Operation equipment for construction machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide operation equipment for construction machinery capable of improving workability in the cargo hoisting work. <P>SOLUTION: The operation equipment is equipped with a control valve 40 for a boom controlling pressure oil flow from a hydraulic pump 38 to a hydraulic cylinder 21 for the boom, solenoid proportional pressure reducing valves 56A, 56B controlling pilot pressure for the control valve 40 for the boom, an operation device 37R outputting a first electric operation signal V<SB>a</SB>for operating the hydraulic cylinder 21 for the boom, an operation device 39 outputting a second electric operation signal V<SB>b</SB>for operating the hydraulic cylinder 21 for the boom or the like through an output wiring 49, and a mode switch 44 capable of selecting excavation mode and cargo hoisting mode. When the cargo hoisting mode is selected with the mode switch 44, a controller 31 generates drive signal S<SB>a</SB>or S<SB>b</SB>corresponding to either the first electric operation signal V<SB>a</SB>or the second electric operation signal V<SB>b</SB>, and outputs it to the solenoid proportional pressure reducing valves 56A, 56B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an operation device for a construction machine, and more particularly to an operation device for a construction machine that suspends a suspended load on a multi-joint type front work machine via a lifting tool.

  For example, some construction machines such as a hydraulic excavator perform not only excavation work but also work of hanging work with a suspended load amount of a predetermined limit (for example, 3 tons) or less by providing a safety device. As such a hydraulic excavator, for example, a lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, and a boom pivotally attached to the front of the upper revolving body, A front working machine (attachment) including an arm, an excavation work tool (bucket), and a lifting tool, an angle sensor that detects a rotation angle of the boom and the arm, and a bottom pressure of a boom cylinder that drives the boom The moment around the boom foot pin immediately before and immediately after the suspended load is determined based on the detected values detected by the angle sensor and the pressure sensor, and the balance of the moments. The structure provided with the controller which calculates suspension load from is disclosed (for example, refer patent document 1). In this conventional technique, a value corresponding to the posture of the front work machine is always selected from among the limit loads corresponding to the postures of various front work machines within the work range in consideration of a predetermined safety factor stored in advance in the controller. The alarm is issued when the suspended load exceeds the limit load.

Japanese Patent Laid-Open No. 7-252091

However, there are the following problems in the above-described prior art.
For example, in a suspended work by one worker, first, the operator operates the operating means provided in the cab of the hydraulic excavator to move the front work machine to a position above the suspended load, and then the front work Move to the vicinity of the hanger provided on the tip side of the machine, and hang the rope of the suspended load on the hanger. Then, the operator returns to the operator's cab and operates the operation means to raise the front work machine to the suspended load grounding position, and then moves to the vicinity of the front work machine lifting tool, at the ground cutting position. Check the rope status. Then, the operator returns to the operator's cab and operates the operation means to transport the suspended load to a predetermined position, and then moves to the vicinity of the hanging tool of the front work machine to remove the suspended load rope.
As described above, in the above prior art, in order to hang and remove the rope of the suspended load from the hanging tool, or to check the rope state at the ground cutting position, the operator uses the excavator cab and the front work machine. It will go back and forth between the lifting tools on the tip side, and the workability at the time of hanging work has been reduced.

  The objective of this invention is providing the operating device of the construction machine which can improve workability | operativity at the time of a suspended load work.

  (1) In order to achieve the above object, the present invention provides a multi-joint type front working machine having a lower traveling body, an upper swing body, and an excavation work tool and a lifting tool supported by the upper swing body. A hydraulic pump, a hydraulic actuator, a hydraulic pilot control valve that controls the flow of pressure oil from the hydraulic pump to the hydraulic actuator, an electromagnetic valve that controls the pilot pressure to the control valve, and the hydraulic pressure First operating means for outputting a first electric operation signal for operating the actuator, a controller for inputting the first electric operation signal from the first operating means, and excavation for performing normal excavation work In a construction machine apparatus apparatus comprising mode selection means capable of selecting a mode and a suspended load mode for performing a suspended load operation, the apparatus is provided so as to be movable in the vicinity of the suspension tool. And a second operating means for outputting a second electric operation signal for operating the hydraulic actuator to the controller via an output wiring, wherein the controller selects the suspended load mode by the mode selecting means. A drive signal corresponding to either the first electric operation signal or the second electric operation signal is generated, and this drive signal is output to the electromagnetic valve.

  In the present invention, for example, when one worker performs a suspended work, first, the worker selects the mode switch to the suspended load mode, and moves to the vicinity of the suspension of the front work machine with the second operation means. To do. When the operator operates the second operation means, a second electric operation signal corresponding to the second operation means is input to the controller to generate a corresponding drive signal, and the pilot pressure from the electromagnetic valve is controlled by this drive signal. Input to the valve. As a result, the hydraulic actuator is driven to operate the front work machine and the upper swing body. As described above, the second operating means disposed near the lifting device of the front work machine is operated to perform the lifting work. Therefore, in order to operate the first operating means, or the rope of the suspended load is used as the hanging tool. Since it is hung and removed, and the state of the rope at the ground cutting position is confirmed, it is no longer necessary to go back and forth between the cab of the construction machine and the suspended load, and the workability during the suspended load operation can be improved.

  (2) In the above (1), preferably, the second operating means can be attached to the front work machine.

  (3) In the above (1) or (2), preferably, the second operation means has a plurality of push button switches that an operator can input in accordance with the operation mode of the hydraulic actuator.

  (4) In any one of the above (1) to (3), preferably, the front work machine further includes load detection means for detecting a suspension load by the suspension tool, and the second operation means. Are provided with suspension load display means for displaying the suspension load detected by the load detection means, and alarm means for issuing an alarm when the suspension load exceeds a predetermined limit load.

  According to the present invention, the second operating means arranged near the lifting device of the front work machine is operated to perform the lifting work, so that it is not possible to go back and forth between the cab of the construction machine and the hanging load. Workability at the time of work can be improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing the entire structure of a hydraulic excavator capable of carrying a suspended work, which is an example of a construction machine to which the present invention is applied. Hereinafter, when the operator is seated in the driver's seat with the excavator shown in FIG. 1, the front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (paper surface in FIG. 1). The front side) and the right side (back side toward the paper surface in FIG. 1) are simply referred to as front side, rear side, left side, and right side.

  In FIG. 1, this hydraulic excavator includes a lower traveling body 2 provided with left and right endless track footwear (crawlers) 1L and 1R (only 1L is shown in FIG. 1) as traveling means, and the lower traveling body 2 The upper revolving unit 3 mounted on the upper part of the upper revolving unit 3 and the revolving frame 4 forming the basic lower structure of the upper revolving unit 3 are attached so as to be rotatable in the horizontal direction around a vertical pin (not shown). A swing post 5, a multi-joint type front working machine 6 attached to the swing post 5 so as to be rotatable (can be lifted and lowered), a so-called canopy type cab 7 provided on the turning frame 4, An upper cover 8 that covers most of the swivel frame 4 other than the cab 7 is provided.

  The lower traveling body 2 includes a substantially H-shaped track frame 9 and drive wheels 10L and 10R rotatably supported near the rear ends of the left and right sides of the track frame 9 (only 10L is shown in FIG. 1). Left and right traveling hydraulic motors 11L and 11R (only 11L shown in FIG. 1) for driving the drive wheels 10L and 10R, respectively, and rotatably supported in the vicinity of the left and right front ends of the track frame 9, Driven wheels (idlers) 12L and 12R (only 12L shown in FIG. 1) that are rotated by the driving force of the drive wheels 10L and 10R through the crawler belts 1L and 1R, respectively, are provided on the front side of the track frame 9 so as to be vertically movable. And a blade 14 for earth removal that moves up and down by a hydraulic cylinder 13 for the blade. Further, a swivel bearing (swivel wheel) 15 is arranged at the center of the lower traveling body 2, and a turning hydraulic motor 16 (described later) for turning the turning frame 4 with respect to the lower traveling body 2 near the center of the swirling wheel 15. (See FIG. 2).

  The swing post 5 can be horizontally rotated with respect to the revolving frame 4 via a vertical pin (not shown). The swing post 5 is connected to a swing hydraulic cylinder 17 provided on the revolving frame 4 via a connecting pin (not shown), and the swing post 5 extends and contracts as a whole in the vertical direction. The front work machine 6 swings to the left and right by rotating around the center of the axis.

  The front work machine 6 includes a boom 18, an arm 19 that is rotatably coupled to the boom 18, and a bucket 20 that is rotatably coupled to the arm 19. The boom 18, the arm 19, and the bucket 20 are operated by a boom hydraulic cylinder 21, an arm hydraulic cylinder 22, and a bucket hydraulic cylinder 23, respectively. A hook 26 is provided near the tip of the arm 19 to hang a rope 25 of the suspended load 24 during a suspended load operation described later. However, normally, the bucket hydraulic cylinder 23 is not driven during the hanging work.

A boom angle sensor 27 (see FIG. 2 described later) for detecting a rotation angle α of the boom 18 with respect to the turning frame 4 is attached to the rotation base of the boom 18. An arm angle sensor 28 (see FIG. 2 described later) for detecting a rotation angle β of the arm 19 with respect to 18 is attached. Further, pressure sensors 29 and 30 (indicating respective internal pressures P _r and P _b ) are provided in the rod side (upper in FIG. 1) oil chamber and the bottom (lower in FIG. 1) oil chamber of the boom hydraulic cylinder 21, respectively. (See FIG. 2 described later). Detection signals such as the rotation angles α and β of the boom 18 and the arm 19 and the internal pressures P _r and P _b on the rod side and the bottom side of the boom hydraulic cylinder 21 are supplied to a controller 31 (described later). (See FIG. 2).

  The driver's cab 7 is provided on the left side of the above-described turning frame 4, and has a seat (driver's seat) 32 on which an operator is seated, a roof 33 provided above the seat 32, and the roof 33. And supporting column 34.

  The left and right traveling hydraulic motors 11L and 11R are respectively driven in front of the seat 32 on which the operator in the driver's cab 7 sits, and can be operated with both hands and feet for moving the hydraulic excavator forward or backward. Operation levers 35L and 35R for left / right travel (only 35L is shown in FIG. 1) are provided.

  Further, on the left side of the seat 32, the turning hydraulic motor 16 is driven by operating the left or right side to turn the upper turning body 3 left or right, and the arm hydraulic pressure is operated by operating the front or rear side. An operating device 37L (see FIG. 2 to be described later) provided with a cross operation type swivel / arm manual operation lever 36L for driving the cylinder 22 to dump or cloud the arm 19 is provided. On the right side of the seat 32, the bucket hydraulic cylinder 23 is driven by operating the left or right side to cause the bucket 20 to cloud or dump, and the boom hydraulic cylinder 21 is driven by operating the front or rear side. An operating device 37R (see FIG. 2 described later) having a cross-operated bucket / boom manual operation lever 36R (see FIG. 2 described later) is provided.

  The upper cover 7 includes an engine (not shown), a hydraulic pump 38 (see FIG. 2 described later) driven by the engine, a fuel tank (not shown) for storing fuel of the engine, and hydraulic pressure. Equipment such as a hydraulic oil tank (not shown) that serves as a pressure oil source for the pump 38 is accommodated.

  Here, as a major feature of the present embodiment, it is attached to the front work machine 6 during excavation work (illustrated by a dotted line in FIG. 1, for example, attached by a magnetic force of a magnet, etc.), and the front work machine is used during lifting work. 6, an operation device 39 that can be disposed in the vicinity of the hook 26 and that operates the boom 18 up and down, the arm 19 bending operation, and the upper revolving structure 3 is provided.

  FIG. 2 is a hydraulic circuit diagram showing a main configuration of the hydraulic drive device related with the operation device 39.

  In FIG. 2, the hydraulic pump 38, the boom hydraulic cylinder 21 driven by the hydraulic oil discharged from the hydraulic pump 38, the arm hydraulic cylinder 22, the turning hydraulic motor 16, and the hydraulic pump, for example. 38, for example, an electro-hydraulic conversion valve type boom control valve 40, an arm control valve 41, which control the flow of pressure oil from the hydraulic cylinder 38 to the boom hydraulic cylinder 21, the arm hydraulic cylinder 22, and the swing hydraulic motor 16, respectively. A valve unit 43 including a turning control valve 42, the operating device 37L having the cross operation type operating lever 36L for instructing the bending operation of the arm 19 and the turning operation of the upper revolving body 3, the vertical movement of the boom 18, etc. The operating device provided with the cross operation type manual operation lever 36R 7R, the operation device 39 for operating the vertical movement of the boom 18, the bending operation of the arm 19, and the turning operation of the upper swing body 3, the controller 31, the boom angle sensor 27, and the arm angle sensor 28. And the rod-side and bottom-side pressure sensors 29 and 30 of the boom hydraulic cylinder 21, and the operator selects either the excavation mode in which excavation work is carried out or the suspended load mode in which hanging work is carried out. A mode switch 44 for outputting to the controller 31 is provided.

The operation devices 37L and 37R include the above-described cross operation type left / right manual operation levers 36L and 36R, and lever displacement detectors 45L and 45R for detecting the respective displacements, and the lever displacement detectors 45L and 45R. Detects the displacement direction (which direction of the cross) of the left and right manual operation levers 36L and 36R and the displacement amount (operation amount), respectively, and a first electric operation signal (operation amount signal) corresponding thereto. ) V _a is output to the controller 31.

The operation device 39 is a push button type boom operation switch 46a, 46b corresponding to the operation mode (raising / lowering) of the boom 18 and a push button type corresponding to the operation mode (dump / cloud) of the arm 19, respectively. Arm operation switches 47a and 47b and push button type swivel operation switches 48a and 48b respectively corresponding to the operation modes (left turn and right turn) of the upper swing body 3 are provided. The second electric operation signal _Vb corresponding to the input of 46b, 47a, 47b, 48a, 48b is output to the controller 31 via the output wiring 49. Note that the output wiring 49 and the like connected to the operating device 39 are disposed on the boom 18 and locked near the rotation base of the arm 19 as shown in FIG. The operating device 39 is hung from the vicinity of the moving base and disposed near the hook 26, or the operating device 39 is disposed on the side surface of the boom 18.

The controller 31 includes a power supply unit 51 connected to a battery (power source) 50, the operation device 37L, enter the first electrical operation signal _{V a} from the 37R, enter the selection signal from the mode switch 44, the boom angle An input unit 52 for inputting detection signals (boom angle α, arm angle β, rod-side internal pressure P _r , bottom-side internal pressure P _b ) from the sensor 27, the arm angle sensor 28, and the pressure sensors 29 and 30 of the boom hydraulic cylinder 21. And a communication unit 53 for inputting the second electric operation signal _Vb from the operation device 39, and a control unit 54 for performing a predetermined calculation process to be described later.

First, the control unit 54 of the controller 31 has a first function as a predetermined function based on the first and second electric operation signals V _a and V _b (for details, refer to a metering table and will be described later). deeds to calculate the output target value of the electromagnetic proportional pressure reducing valve), the generated first driving signal S _a or the second driving signal S proportional solenoid of the boom control valve 40 from the output unit 55 to either _b The pressures are output to the pressure reducing valves 56A and 56B, the electromagnetic proportional pressure reducing valves 57A and 57B of the arm control valve 41, and the electromagnetic proportional pressure reducing valves 58A and 58B of the turning control valve 42, respectively.

Then, the boom solenoid proportional pressure reducing valves 56A, 56B, the solenoid proportional pressure reducing valve 57A for the arm, 57B, swiveling electromagnetic proportional pressure reducing valves 58A, 58B, based on the drive signal _{S a} or _{S b} from their controller 31, pilot pump A primary pilot pressure from a hydraulic pressure source (not shown) or the like is reduced to generate an operating pilot pressure, and pilot operating portions 40a and 40b of the boom control valve 40 and a pilot operating portion of the arm control valve 41, respectively. 41a, 41b and the pilot control portions 42a, 42b of the turning control valve 42 are outputted to thereby switch the boom control valve 40, the arm control valve 41, and the turning control valve 42.

Further, as a second function, the controller 54 of the controller 31 has a boom angle α, an arm angle β, a rod-side internal pressure P _r , and a bottom-side internal pressure P when the suspended load mode is selected by the mode switch 44. based on the _b performs predetermined calculation processing (in particular, calculates the holding force moment of the boom hydraulic cylinder 21 from the rod-side pressure P _r and the bottom side pressure P _b, the front from the boom angle α and the arm angle β such The moment of the working machine 6 and the horizontal distance of the suspended load 24 are calculated, and the difference between the holding force moment and the moment of the front working machine 6 becomes the moment of the suspended load 24, and the weight of the suspended load 24 is determined by this moment). calculate.

  The calculated suspended load 24 position, rated load (for example, a preset maximum allowable load determined according to the suspended load 24 position, for example), and numerical values such as the suspended load are output as an output signal 55. Is output and displayed on a display 59 provided in the cab 7, and is output and displayed on the display unit 60 provided on the operating device 39 from the communication unit 53. Further, the suspension load is compared with a predetermined limit load (for example, a rated load or a load set based on the rated load). When the suspension load exceeds the predetermined limit load, a buzzer 61 provided in the cab 7 is provided. And the drive signal which drives the buzzer 62 provided in the operating device 39 is respectively generated, and these drive signals are output from the output unit 55 and the communication unit 53 to the buzzers 61 and 62, respectively, and sounded.

  Next, the control procedure of the controller 31 will be described. FIG. 3 is a flowchart showing the control processing content (program) of the first function of the controller 31, and FIG. 4 is a flowchart showing the control processing content of the second function of the controller 31.

In these FIGS. 3 and 4, first, at step 100, the operation device 37L, the first electrical operation signal _{V a} from the 37R is input, the routine proceeds to step 110, based on the first electrical operation signals _{V a} predetermined calculation processing is performed Te, generating a first driving signal S _a. Thereafter, the process proceeds to step 120, where the second electric operation signal _Vb from the operation device 39 is input, and the process proceeds to step 130, where a predetermined calculation process is performed based on the second electric operation signal _Vb. The first drive signal _Sb is generated. Then, the process proceeds to step 140, and it is determined by the selection signal from the mode switch 44 whether or not it is the suspended load mode.

  If the suspended load mode is selected by the mode switch 44, the determination at step 140 is satisfied, and the routine proceeds to the suspended load warning process at step 150.

In step 150, the suspension load warning process is performed first in step 151, the boom angle α from the boom angle sensor 27, the arm angle β from the arm angle sensor 28, the rod side from the pressure sensors 29 and 30 of the boom hydraulic cylinder 21. The internal pressure P _r and the bottom side internal pressure P _b are input, and the routine proceeds to step 152 where the predetermined calculation processing is performed as described above to calculate the suspension load, and this suspension load or the like is displayed in the cab 7 as a display signal. The data is output and displayed on the display unit 59 and the display unit 60 of the operation device 39, respectively. And it progresses to step 153 and it is determined whether a suspension load is larger than a predetermined limit load. If the suspension load is greater than the predetermined limit load, the determination at step 153 is satisfied, and the routine goes to step 154. In step 154, a predetermined calculation process is performed, and the generated drive signal is output to the buzzer 61 in the cab 7. The process proceeds to step 155, and the generated drive signal is output to the buzzer 62 of the controller device 39. When step 155 ends, the suspension load warning process of step 150 ends, and the process proceeds to step 160. If the suspension load is smaller than the predetermined limit load in step 153, the determination is not satisfied, and the suspension load warning process in step 150 is terminated, and the process proceeds to step 160.

In step 160, the larger one of the first and second drive signals S _a and S _b is selected and outputted (for example, the first drive signal S _a is preferentially outputted. You may do it). When step 160 ends, the process returns to step 100 and the same procedure is repeated.

If the excavation mode is selected by the mode switch 44 at step 140, the determination is not satisfied and the routine goes to step 170. In step 170, the first drive signal _Sa is selected and output. When step 170 ends, the process returns to step 100 and the same procedure is repeated.

  In addition, in the above, the bucket 20 comprises the excavation working tool as described in a claim, and the hook 26 comprises the hanging tool as described in a claim. Further, the mode switch 44 constitutes a mode selection means that can select a digging mode for performing a normal digging operation and a suspended load mode for performing a suspending load operation.

  Further, step 152 of FIG. 4 performed by the boom angle sensor 27, the arm angle sensor 28, the rod side pressure sensor 29 of the boom hydraulic cylinder, the bottom side pressure sensor 30, and the controller 31 is the suspension load by the lifting device of the front work machine. A load detecting means for detecting the above is configured. The display unit 60 is provided in the second operation means, and constitutes a suspension load display means for displaying the suspension load detected by the load detection means. The buzzer 62 is provided in the second operation means, and the suspension load is displayed. Constitutes a warning means for issuing a warning when a predetermined limit load is exceeded.

  Next, the operation and effect of this embodiment will be described.

For example, when one worker performs a suspended work, the worker first selects the mode switch 44 in the cab 7 to the suspended mode (this satisfies the determination in step 140 of FIG. 3), and the boom 18 The operating device 39 removed from the side is moved to the vicinity of the hook 26 of the CFC working machine 6. For example, when the operator operates the operation switch 46a of the operation device 39 in order to raise the boom 18, the second operation from the operation device 39 is performed in steps 120 and 130 in FIG. electric operation signal _{V b} of the second driving signal _{S b} corresponding is input to the controller 31 is generated, in step 160 through steps 140 and 150, the second driving signal _{S b} is the solenoid proportional pressure reducing valves 56A The boom control valve 40 is switched by the pilot pressure from the electromagnetic proportional pressure reducing valve 56A. As a result, the boom hydraulic cylinder 21 is driven and the boom 18 is raised. At this time, in the suspension load warning process of step 150, in steps 151 and 152, the controller 31 calculates the load of the suspension load 24 based on the detection signals α, β, P _r , and P _b , Are respectively displayed as display signals and displayed on the display 59 in the cab 7 and the display unit 60 of the operating device 39. If the suspended load is larger than the predetermined limit load, the determination in step 153 is satisfied and step 154 is satisfied. And 155, drive signals are output, respectively, and the buzzer 61 in the cab 7 and the buzzer 62 of the operating device 39 sound.

  As described above, in the present embodiment, the operation device 39 arranged near the hook 26 of the front work machine 6 is operated to perform the lifting work, so in order to operate the operation devices 37L and 37R in the cab 7, Or in order to hang the rope 25 of the suspended load 24 on or off the hook 26, or to check the state of the rope 25 at the ground cutting position, it becomes impossible to go back and forth between the cab 7 and the suspended load 24. Workability at the time can be improved.

  Further, the load of the suspended load 24 is displayed not only on the indicator 59 in the cab 7 but also on the display unit 60 of the operation device 39, and when the load of the suspended load 24 is larger than a predetermined load, Since the buzzer 62 provided in the operating device 39 is sounded in addition to the buzzer 61 provided in the operation device 39, the hanging work can be performed safely. The operation device 39 includes a plurality of push button type operation switches 46a, 46b, 47a, 47b, 48a, 48b corresponding to the vertical movement of the boom 18, the bending movement of the arm 19, and the turning movement of the upper swing body 3. By adopting such a configuration, it is possible to sufficiently avoid erroneous operation due to, for example, the case where an operation lever is provided.

  In the above embodiment of the present invention, the operating device 39 includes a plurality of operation switches 46a, 46b, 47a, 47b, 48a, 48b corresponding to the operating modes of the boom 18, the arm 19, and the upper swing body 3. However, the present invention is not limited to this. That is, for example, an operation switch may be provided that allows the operator to input an operation distance in the vertical and horizontal directions of the hook 26. In this case, a second electric operation signal corresponding to the input of the operation switch is input to the controller, and the controller controls the posture of the front work machine 6 in response to this. Further, for example, a cross operation type or a longitudinal operation type manual operation lever may be provided, and a second electric operation signal corresponding to the displacement direction and the displacement amount of the manual operation lever may be output. Further, for example, a power switch that can be switched to the ON / OFF state may be additionally provided, and the second electrical operation signal may be output when the power switch is in the ON state. In these cases, the same effect as described above can be obtained.

  In the above-described embodiment of the present invention, the example in which the operating device 39 can be attached to the side surface of the boom 18 of the front work machine 6 has been described. It may be possible. In this case, the same effect as described above can be obtained.

  In the above-described embodiment of the present invention, as load detection means for detecting the suspension load by the suspension of the front work machine 6, the boom angle sensor 27, the arm angle sensor 28, the rod side pressure sensor 29 of the boom hydraulic cylinder, Although the example detected by the bottom side pressure sensor 30 etc. was demonstrated, it is not restricted to this. That is, for example, a lifting tool may be provided on the rotating base of the bucket 20 via a crane link, and an electric load detector (such as a load cell) may be disposed between the crane link and the lifting tool. . In this case, the same effect as described above can be obtained.

It is a side view showing the whole structure of the hydraulic shovel used as the application object of the operating device of the construction machine of this invention. 1 is a hydraulic circuit diagram illustrating an embodiment of an operation device for a construction machine according to the present invention together with a configuration of main parts of a related hydraulic drive device. It is a flowchart showing the control processing content of the 1st function of the controller which comprises one Embodiment of the operating device of the construction machine of this invention. It is a flowchart showing the control processing content of the 2nd function of the controller which comprises one Embodiment of the operating device of the construction machine of this invention.

Explanation of symbols

2 Lower traveling body 3 Upper revolving body 6 Front work machine 7 Driver's cab 16 Turning hydraulic motor 18 Boom 19 Arm 20 Bucket (excavation work tool)
21 Boom hydraulic cylinder 22 Arm hydraulic cylinder 26 Hook
27 Boom angle sensor (load detection means)
28 Arm angle sensor (load detection means)
29 Rod side pressure sensor (load detection means)
30 Bottom pressure sensor (load detection means)
31 Controller (Load detection means)
37L operating device (first operating means)
37R operating device (first operating means)
38 Hydraulic pump 39 Operating device (second operating means)
40 Control valve for boom 41 Control valve for arm 42 Control valve for turning 44 Mode switch (mode selection means)
46a Boom operation switch 46b Boom operation switch 47a Arm operation switch 47b Arm operation switch 48a Rotation operation switch 48b Rotation operation switch 49 Output wiring 56A Boom electromagnetic proportional pressure reducing valve 56B Boom electromagnetic proportional pressure reducing valve 57A Arm Electromagnetic proportional pressure reducing valve 57B Electromagnetic proportional pressure reducing valve for arm 58A Turning electromagnetic proportional pressure reducing valve 58B Turning electromagnetic proportional pressure reducing valve 60 Display unit (suspension load display means)
62 Buzzer (alarm means)
S _a first drive signal S _b second drive signal V _a first electric operation signal V _b second electric operation signal

Claims (4)

A lower traveling body, an upper swing body, an articulated front working machine pivotally supported by the upper swing body and provided with an excavation work tool and a lifting tool, a hydraulic pump, a hydraulic actuator, and the hydraulic pump A hydraulic pilot type control valve for controlling the flow of pressure oil to the hydraulic actuator, an electromagnetic valve for controlling the pilot pressure to the control valve, and a first electric operation signal for operating the hydraulic actuator are output. A first operation means, a controller for inputting the first electric operation signal from the first operation means, a digging mode for performing a normal digging work, and a hanging load mode for carrying a suspending work can be selected. In a construction machine device comprising mode selection means,
Provided with a second operating means that is movably provided in the vicinity of the suspension and outputs a second electric operation signal for operating the hydraulic actuator to the controller via an output wiring;
The controller generates a drive signal according to either the first electric operation signal or the second electric operation signal when the hanging load mode is selected by the mode selection means, and the drive signal is A construction machine operating device characterized by outputting to a solenoid valve.   2. The construction machine operating device according to claim 1, wherein the second operating means is attachable to the front work machine.   3. The construction machine operating device according to claim 1, wherein the second operating means includes a plurality of push button switches that an operator can input in accordance with an operation mode of the hydraulic actuator. Operation equipment for construction machinery.   The construction machine operating device according to any one of claims 1 to 3, further comprising a load detecting means for detecting a suspension load by the lifting tool of the front work machine, wherein the second operating means includes A construction machine operation comprising: a suspension load display means for displaying the suspension load detected by the load detection means; and an alarm means for issuing an alarm when the suspension load exceeds a predetermined limit load. apparatus.

Images