JP4959532B2 - Excavator - Google Patents

Description

  The present invention relates to an excavation work machine (hydraulic excavator), and more particularly to an excavation work machine capable of improving work efficiency.

  The excavation work machine (hydraulic excavator) includes a lower traveling body, an upper revolving body that is turnable on the lower traveling body, and a front working device that is provided on the upper revolving body so as to be lifted and lowered. The front working device is composed of a boom, an arm, and a bucket, and the boom, arm, and bucket are driven by a boom cylinder, an arm cylinder, and a bucket cylinder, respectively. Such excavation work machines perform excavation work by rotating the boom, arm, and bucket respectively by linearly expanding and contracting the hydraulic cylinders of the boom cylinder, arm cylinder, and bucket cylinder.

  In such excavation work machines, examples of increasing the maximum excavation force during arm cloud operation include those described in Patent Documents 1 to 3.

  The excavation work machine described in Patent Document 1 is mounted between the above-described basic configuration, a bell crank that is pivotably attached to one end of an arm, and connected to one end of an arm cylinder, and is interposed between the bell crank and the arm. A bell crank cylinder that changes the length between the connecting portion of the bell crank to the arm cylinder and the other end of the arm by rotating the bell crank, and by extending the bell crank cylinder The vertical distance between the arm rotation center and the arm cylinder is increased to increase the maximum excavation force during arm cloud operation.

  The excavation work machine described in Patent Document 2 includes the above basic configuration and a hydraulic cylinder interposed between the rod end of the arm cylinder and the pin. The arm is provided at the upper end of the arm, and the rod end of the arm cylinder is It has a long hole for slidably connecting, and by extending the hydraulic cylinder, the rod end of the arm cylinder is slid along the long hole, increasing the vertical distance between the arm rotation center and the arm cylinder. The maximum excavation force during arm cloud operation is increased.

  The excavation work machine described in Patent Document 3 includes two arm cylinders having different mounting angles as arm cylinders in the basic configuration described above, and increases the excavation force at the start of excavation during arm cloud operation.

JP-A-9-71963 Japanese Utility Model Publication No. 7-31954 Japanese Utility Model Publication No. 7-31955

  However, the above prior art has the following problems.

  In an excavation work machine, a boom, an arm, and a bucket are rotated by a hydraulic cylinder that expands and contracts linearly. Therefore, the force that can be generated at the bucket tip (excavation force) differs depending on the attitude of the front working device at that time, and the maximum excavation is achieved when the vertical distance between the pivot point of the arm relative to the boom and the arm cylinder that rotates the arm is maximum Power is obtained. And assuming the work of excavating with the bucket by operating in the arm cloud direction while extending from the contracted state of the arm cylinder, from the posture when the arm cylinder is in the minimum contraction position to the posture where the excavation force is maximum As the excavation resistance increases, the vertical distance between the pivot point of the arm and the cylinder of the arm increases and the excavation force increases, but from the position where the excavation force becomes maximum to the position where the arm cylinder reaches the maximum extension position. The drilling resistance increases, but the drilling force gradually decreases. Therefore, there is a problem that work efficiency and fuel consumption are deteriorated from a posture where the excavation force becomes maximum to a posture where the arm cylinder reaches the maximum extension position.

  In the conventional techniques described in Patent Documents 1 to 3, a mechanism for increasing the maximum excavation force during arm cloud operation is added, so that the problem of reduced work efficiency can be solved. However, a special mechanism is adopted for this purpose, which makes the structure complicated and the manufacturing cost expensive. In addition, there is no change in consuming fuel, and the problem of worsening fuel consumption cannot be solved.

  An object of the present invention is to improve work efficiency in excavation work performed by operating an arm in the direction of the arm cloud, prevent deterioration of fuel consumption, and have a simple structure and low manufacturing cost. It is to provide a machine excavation work support device.

(1) In order to achieve the above object, the present invention provides a lower traveling body, an upper revolving body that is turnable on the lower traveling body, a boom, an arm, An excavation work support device for an excavation work machine comprising an articulated front work device comprising a bucket and a boom cylinder, an arm cylinder, and a bucket cylinder that respectively drive the boom, arm, and bucket. Detection means for detecting a positional relationship, workload detection means for detecting a workload when the arm is operated in the arm cloud direction, positional relationship detected by the detection means and the workload detection means was based on the work load, the positional relationship near Li Kui said workload set drilling power is maximized said arm relative to the boom And that a notification means for notifying the Der Rukoto more value to the operator.

Such a detecting means of the positional relationship between the work load detecting means and the notifying means is provided, the arms of the Der Rukoto positional relationship near Li Kui workload set value or more drilling force is maximized relative to the boom operator In the excavation work performed by operating the arm in the direction of the arm cloud, the operator recognizes that the arm is in a positional relationship where the excavation force is maximum with respect to the boom, and the work efficiency and fuel consumption are reduced. Adjust the operation to avoid excavation in the worse range as much as possible and excavate in other areas. Thereby, work efficiency can be improved and deterioration of fuel consumption can be prevented.
On the other hand, when the arm is operated in the arm dump direction or when the arm is operated in the arm cloud direction, the work load detected by the work load detecting means does not exceed the set value when the light load work is performed. Therefore, the operator can comfortably work without feeling the inconvenience caused by the unnecessary operation of the notification means.

Further, the excavation work support device is composed of a positional relationship detection means, a work load detection means, and a notification means, and does not require a complicated mechanism. Therefore, the structure is simple and the manufacturing cost can be reduced.

(2) Oite above (1), preferably, the notification means, Ri near within a predetermined angular range including the angle of excavation force is maximum and a small angle before and after the arm relative to the boom and wherein the workload outputs a notification signal to the set value or more der Rutoki.

  Thereby, the notifying means can accurately notify the operator that the arm is in a positional relationship where the excavation force is maximum with respect to the boom.

(3) Oite above (1), preferably, the notification means, the predetermined angular range near Li Kui the drilling force is the starting point or ending point angle that maximizes the arm relative to the boom workload outputs a notification signal to the set value or more der Rutoki.

  Also by this, the notification means can accurately notify the operator that the arm is in a positional relationship with which the excavation force is maximized with respect to the boom.

  According to the present invention, it is possible to improve work efficiency in excavation work performed by operating the arm in the arm cloud direction, to prevent deterioration of fuel consumption, and to simplify the structure and reduce the manufacturing cost.

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

~Constitution~
FIG. 1 is a view showing an excavation work machine (hydraulic excavator) provided with an excavation work support device according to an embodiment (first embodiment) of the present invention together with the excavation work support device.

  In FIG. 1, an excavation work machine including the excavation work support device according to the present embodiment includes a lower traveling body 101, an upper revolving body 102 that is turnably provided on the lower traveling body 101, and the upper revolving body. And an articulated front working device 103 including a boom 106, an arm 107, and a bucket 108. The upper swing body 102 is provided with a cab (cabin) 104. The boom 106, the arm 107, and the bucket 108 are driven by a boom cylinder 109, an arm cylinder 110, and a bucket cylinder 111, respectively.

  FIG. 2 is a diagram showing a hydraulic system mounted on the excavation work machine shown in FIG. 1 together with the excavation work support device.

  In FIG. 2, the hydraulic system for the excavator includes a hydraulic pump 2, a plurality of directional control valves 31 to 33, and the boom cylinder 109, arm cylinder 110, and bucket cylinder 111, and the hydraulic pump 2 is an engine. 1, the boom cylinder 109, the arm cylinder 110, and the bucket cylinder 111 are driven by the pressure oil supplied from the hydraulic pump 2, and the plurality of directional control valves 31 to 33 are driven from the hydraulic pump 2 to the boom cylinder 109 and the arm cylinder 110. The direction and flow rate of the pressure oil respectively supplied to the bucket cylinder 111 are controlled.

  Further, the hydraulic system of the excavating work machine includes a pilot pump 3 driven by the engine 1 and a control pilot pressure a to operate the direction switching valves 31 to 33 using the pressure oil supplied from the pilot pump 3 as a source pressure. remote control valves 41 to 43 for generating f, and the discharge pressure of the pilot pump 3 is kept constant by the pilot relief valve 44. The remote control valves 41 to 43 are respectively operated by left and right control levers 46 and 47 provided on the left and right sides of the cab 104.

  The control lever 46 is for a boom and a bucket. When the control lever 46 is operated in the boom raising direction, the remote control valve 41 generates a control pilot pressure a, and this control pilot pressure a is applied to the pressure receiving portion 31 a of the direction switching valve 31. As a result, the direction switching valve 31 is switched from the neutral position I to the operation position II on the right side of the figure. As a result, the pressure oil from the hydraulic pump 2 flows into the bottom side of the boom cylinder 109 via the direction switching valve 31, the boom cylinder 109 extends, and the boom 106 moves in the boom raising direction (A direction shown in FIG. 1). Rotate.

  When the control lever 46 is operated in the boom lowering direction, the remote control valve 41 generates a control pilot pressure b, which is guided to the pressure receiving portion 31b of the direction switching valve 31, and the direction switching valve 31 is in the neutral position I. To the operating position III on the left side of the figure. As a result, the pressure oil from the hydraulic pump 2 flows into the rod side of the boom cylinder 109 via the direction switching valve 31, the boom cylinder 109 contracts, and the boom 106 moves in the boom lowering direction (direction B shown in FIG. 1). Rotate.

  When the control lever 46 is operated in the bucket cloud direction, the remote control valve 43 generates a control pilot pressure e, which is guided to the pressure receiving portion 33a of the direction switching valve 33, and the direction switching valve 33 is in the neutral position I. To the operating position II on the right side of the figure. As a result, the pressure oil from the hydraulic pump 2 flows into the bottom side of the bucket cylinder 111 via the direction switching valve 33, the bucket cylinder 111 extends, and the bucket 108 moves in the bucket cloud direction (E direction shown in FIG. 1). Rotate.

  When the control lever 46 is operated in the bucket dump direction, the remote control valve 43 generates a control pilot pressure f, which is guided to the pressure receiving portion 33b of the direction switching valve 33, and the direction switching valve 33 is in the neutral position I. To the operating position III on the left side of the figure. As a result, the pressure oil from the hydraulic pump 2 flows into the rod side of the bucket cylinder 111 via the direction switching valve 33, the bucket cylinder 111 contracts, and the bucket 108 moves in the bucket dump direction (F direction shown in FIG. 1). Rotate.

  The control lever 47 is for arm and for turning, and when the control lever 47 is operated in the arm cloud direction, the remote control valve 42 generates a control pilot pressure c, and this control pilot pressure c is a pressure receiving portion 32a of the direction switching valve 32. The direction switching valve 32 is switched from the neutral position I to the operation position II on the right side of the figure. As a result, the pressure oil from the hydraulic pump 2 flows into the bottom side of the arm cylinder 110 via the direction switching valve 32, the arm cylinder 110 extends, and the arm 107 moves in the arm cloud direction (C direction shown in FIG. 1). Rotate.

  When the control lever 47 is operated in the arm dump direction, the remote control valve 42 generates a control pilot pressure d, which is guided to the pressure receiving portion 32b of the direction switching valve 32, and the direction switching valve 32 is in the neutral position I. To the operating position III on the left side of the figure. As a result, the pressure oil from the hydraulic pump 2 flows into the rod side of the arm cylinder 110 via the direction switching valve 32, the arm cylinder 110 contracts, and the arm 107 moves in the arm dump direction (D direction shown in FIG. 1). Rotate.

  The hydraulic system of the excavating work machine includes other hydraulic actuators such as a traveling motor that drives the lower traveling body 101 and a revolving motor that rotates the upper revolving body 102 relative to the lower traveling body 101, and a direction switching valve that controls them. However, they are not shown in the hydraulic system shown in FIG.

  The excavation work support apparatus according to the present embodiment is provided in the excavation work machine as described above, and is indicated by the reference numeral 10 in FIGS. 1 and 2 as a whole. The excavation work support device 10 includes an angle sensor 11 that detects an angle of the arm 107 with respect to the boom 106 (arm angle), a pressure sensor 12 that detects a pressure on the bottom side of the arm cylinder 110, and the angle sensor 11 and the pressure sensor 12. Is provided with a controller 13 that performs a predetermined calculation process by inputting the detection signal and a lamp 14 that is turned on by an output signal from the controller 13.

  As shown in FIG. 1, the angle sensor 11 is a potentiometer attached to a pivot fulcrum 112 between the boom 106 and the arm 107, and outputs a position signal (angle signal) corresponding to the arm angle. The controller 13 calculates the arm angle based on the position signal.

  As shown in FIG. 2, the pressure sensor 12 is connected to an actuator line that connects the actuator port of the direction switching valve 32 and the bottom port of the arm cylinder 110. The controller 13 calculates the pressure on the bottom side of the arm cylinder 110 based on the detection signal.

  FIG. 3 is an operation explanatory diagram showing the concept of the arm angle calculated using the detection signal of the angle sensor 11 and the lighting range of the lamp 14.

  In FIG. 3, the arm 107 rotates between a position A and a position C with respect to the boom 106. The position A is a position where the arm 107 is rotated to the maximum in the dumping direction with respect to the boom 106, and the angle of the arm 107 with respect to the boom 106 is maximized, and corresponds to the minimum contraction position (minimum stroke position) of the arm cylinder 110. . The position C is a position where the arm 107 is rotated in the cloud direction so as to be closest to the boom 106, and the angle of the arm 107 with respect to the boom 106 is minimized, and corresponds to the maximum extension position (maximum stroke position) of the arm cylinder 110. . When the arm 107 is at the position A, the angle sensor 11 outputs a minimum position signal (angle signal) as a detection signal. When the arm 107 is at the position C, the angle sensor 11 outputs the maximum position signal (angle). Signal).

  The controller 13 receives the position signal of the angle sensor 11 and calculates the arm angle α with reference to the position A based on the position signal. The arm angle α is a minimum αmin when the arm 107 is at the position A, increases as the arm 107 rotates in the cloud direction, and reaches a maximum αmax when the arm 107 is rotated to the position C. In FIG. 3, α1 is an angle at which the arm 107 has the maximum excavation force with respect to the boom 106 (maximum excavation force angle).

  FIG. 4 is a flowchart showing the processing contents of the controller 13.

  In FIG. 4, the controller 13 inputs the detection signal from the angle sensor 11 and the detection signal from the pressure sensor 12 (step S1). Next, the controller 13 determines whether or not the arm angle α calculated based on the detection signal of the angle sensor 11 is within the range of the minute angle ± α0 ° before and after the maximum excavation force angle α1, that is, α1−α0 ° < It is determined whether α <α1 + α0 ° (step S2). The minute angle α0 ° is used to determine whether or not the arm angle α is in the vicinity of the maximum excavation force angle α1, and is set to about 5 °, for example.

  FIG. 5 is a diagram showing details of the positional relationship between the arm 107 and the arm cylinder 110 when the arm angle α becomes the maximum excavation force angle α1.

  The arm 107 is pin-coupled to the boom 106 at the rotation fulcrum 112, and the rod tip of the arm cylinder 110 is pin-coupled to the arm 107 at the rotation fulcrum 120. As the arm cylinder 110 extends from the minimum contraction position to the maximum extension position, the pivot fulcrum 120 between the rod tip of the arm cylinder 110 and the arm 107 moves from the position A to the position B and further to the position C in the drawing. To do.

  The force (excavation force) that can be exerted at the tip of the bucket 108 differs depending on the posture of the front working device 103 at that time, and as shown in position B in FIG. 5, the pivot fulcrum 112 between the arm 107 and the boom 106 and the arm cylinder Maximum digging force is obtained when the vertical distance L up to 110 is maximized. The maximum excavation force angle α1 is the arm angle at this time.

  Returning to FIG. 4, when the determination is negative in step S2 (when it is determined that α1−α0 ° <α <α1 + α0 °), the lamp 14 is turned off (step S4). That is, when the lamp 14 has been lit up until now, the lighting signal output to the lamp 14 is stopped, and when the lamp 14 has already been turned off, the state is maintained. On the other hand, when the determination in step S2 is affirmative (when it is determined that α1−α0 ° <α <α1 + α0 °), the pressure P on the bottom side of the arm cylinder 110 obtained from the detection signal of the pressure sensor 12 is determined. Is higher than a predetermined value P0 (step S3). Here, the predetermined value P0 of the pressure P on the bottom side of the arm cylinder 110 is a value for determining whether or not excavation work is being performed in the arm cloud direction and excavating earth and sand with the bucket 111. The average digging pressure during the digging operation is set to a value lower than that. If the determination in step S3 is negative (if it is determined that P> P0 is not satisfied), the lamp 14 is turned off (step S4). If the determination in step S3 is affirmative (P> P0 is determined). And) a lighting signal is output to the lamp 14, and the lamp 14 is turned on (step S5).

  In the above, the angle sensor 11 constitutes detection means for detecting the positional relationship of the arm 107 with respect to the boom 106, and the controller 13 and the lamp 14 are configured so that the arm 107 is mounted on the boom 106 based on the positional relationship detected by the angle sensor 11. Informing means for informing the operator that the excavation force is in the maximum positional relationship.

  The pressure sensor 12 constitutes a work load detecting means for detecting the bottom side load pressure of the arm cylinder 110 when the arm 107 is operated in the arm cloud direction, and the notifying means constituted by the controller 13 and the lamp 14 is provided. Based on the positional relationship detected by the angle sensor 11 and the work load detected by the pressure sensor 12, the arm 107 is in a positional relationship where the excavation force is maximum with respect to the boom 106, and the work load is greater than or equal to the set value. Inform the operator that

~ Operation ~
Next, the operation of the present embodiment will be described.

  When the operator operates the arm control lever 47 in the arm cloud direction for the purpose of excavation work, the arm cylinder 110 extends and the arm 107 rotates in the arm cloud direction. As the arm 107 rotates in the arm cloud direction, the arm angle α with respect to the position A shown in FIG. 3 increases, and the controller 13 calculates the arm angle α based on the position signal of the angle sensor 11. . At this time, the controller 13 inputs the detection signal of the pressure sensor 12 and calculates the pressure (load pressure P) on the bottom side of the arm cylinder 110.

  When the arm 107 rotates in the arm cloud direction, before the arm angle α reaches the vicinity of the maximum excavation force angle α1, the controller 13 determines that α1−α0 ° <α <α1 + α0 °, and FIG. The determination in step S2 is denied and the lamp 14 is kept off (S1 → S2 → S4). When the arm angle α increases to near the maximum excavation force angle α1, the controller 13 determines that α1−α0 ° <α <α1 + α0 °, and affirms the determination in step S2. At this time, if the tip of the bucket 108 is in an excavation state where it hits the earth and sand, a large load pressure is generated on the bottom side of the arm cylinder 110, so the controller 13 determines that P> P0. The determination in step S3 is affirmed and the lamp 14 is turned on (S1 → S2 → S3 → S5).

  In general, when an operation of excavating with the bucket 108 while extending the arm cylinder 110 from the contracted state is assumed, the excavation resistance increases between the position A and the position B in FIG. The vertical distance L of the arm cylinder 110 is increased, and the excavation force is increased. On the other hand, the excavation resistance increases from the position B to the position C, but the excavation force gradually decreases. Therefore, the working efficiency and the fuel consumption are deteriorated from the position B to the position C.

  The operator recognizes that when the lamp 14 is lit, the arm 107 is at the maximum excavation force angle α1 (the positional relationship at which the arm 107 has the maximum excavation force with respect to the boom 108), and the position where work efficiency and fuel consumption deteriorate. The operation is adjusted so that excavation in the range from B to position C is avoided as much as possible, and excavation is performed in other ranges. Thereby, work efficiency can be improved and deterioration of fuel consumption can be prevented.

After the excavation work, when the operator operates the arm control lever 47 in the arm dump direction in order to release the earth and sand in the bucket 108 onto the dump truck, the arm cylinder 110 contracts and the arm 107 Rotating in the arm dump direction, the arm angle α decreases. However, at this time, even if the arm angle α is close to the maximum excavation force angle α1, a large load pressure is not generated on the bottom side of the arm cylinder 110, and P <P0. Therefore, the controller 13 determines in step S3. Denied, the lamp 14 is kept off (S1->S2->S3-> S4). As a result, the operator can comfortably perform the work without feeling uncomfortable due to the lamp 14 being turned on unnecessarily.
Even when the operator operates the arm control lever 47 in the arm cloud direction in order to perform a light load operation such as a leveling operation, the arm 107 rotates in the arm cloud direction and the arm angle α increases. Even when the arm angle α is close to the maximum excavation force angle α1, no large load pressure is generated on the bottom side of the arm cylinder 110, and P <P0. Therefore, the controller 13 denies the determination in step S3, and the lamp 14 Is kept off (S1->S2->S3-> S4). As a result, the operator can comfortably perform the work without feeling uncomfortable due to the lamp 14 being turned on unnecessarily.

~effect~
As described above, in the present embodiment, in the excavation work in which the arm 107 is operated in the arm cloud direction, when the arm angle α is in the vicinity of the maximum excavation force angle α1, the lamp 14 is turned on to In order to inform the operator that the excavation force is at the maximum position relative to the boom 108, the operator recognizes that the excavation force is at the maximum position by turning on the lamp 14, and the work efficiency and fuel consumption are reduced. The operation is adjusted so as to avoid excavation in the deteriorated range as much as possible and excavate in the other range, thereby improving the work efficiency and preventing the deterioration of the fuel consumption.

  Further, when the arm 107 is in a positional relationship where the excavating force is maximum with respect to the boom 106 and the detected pressure P of the pressure sensor 12 is equal to or higher than the set value P0, the lamp 14 is turned on so that the arm 107 moves to the boom 108. In order to inform the operator that the excavation force is at a maximum, the arm 107 is operated in the arm dump direction, or even when the arm 107 is operated in the arm cloud direction, The lamp 14 is not lit, so that the operator can work comfortably without unnecessarily feeling the inconvenience of the lamp 14 being lit.

  Further, the excavation work support device 10 includes an angle sensor 11, a pressure sensor 12, a controller 13, and a lamp 14, and does not require a complicated mechanism. Therefore, the structure is simple and the manufacturing cost can be reduced.

~ Other embodiments ~
A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is an operation explanatory diagram showing the concept of the arm angle and the lighting range of the lamp 14 in the present embodiment, and FIG. 7 is a flowchart showing the processing contents of the controller in the present embodiment. In the figure, components equivalent to those shown in FIGS. 3 and 4 are denoted by the same reference numerals.

  In the first embodiment, as shown in FIG. 3, the arm 107 is attached to the boom 108 to inform the operator that the arm 107 is in a positional relationship where the excavation force is maximum with respect to the boom 108. The lamp 14 is turned on when the angle is within a predetermined angle range including the maximum excavation force angle α1 that is the maximum excavation force and the minute angles ± α0 ° before and after the maximum excavation force angle α1. This embodiment shows a modification of this point. That is, in the present embodiment, as shown in FIG. 6, the arm 107 has an angle range of arm angles αmin to α1 with the maximum digging force angle α1 that is the angle at which the digging force is maximum with respect to the boom 108 as an end point. When the arm angle α is present, the lamp 14 is turned on. In this case, as shown in FIG. 7, the controller may determine whether or not the arm angle α is equal to or smaller than the maximum excavation force angle α1 in step S2A.

  Also in the present embodiment configured as described above, it is possible to notify the operator that the arm 107 is in a positional relationship in which the excavation force is maximized with respect to the boom 108 by turning off the lamp 14, and thus the first embodiment. The same effect can be obtained.

  A third embodiment of the present invention will be described with reference to FIGS. FIG. 8 is an operation explanatory diagram showing the concept of the arm angle and the lighting range of the lamp 14 in the present embodiment, and FIG. 9 is a flowchart showing the processing contents of the controller in the present embodiment. In the figure, components equivalent to those shown in FIGS. 3 and 4 are denoted by the same reference numerals. The present embodiment shows still another modified example of the range in which the lamp 14 is turned on. That is, in the present embodiment, as shown in FIG. 8, the arm 107 has an angle range of arm angles α1 to αmax starting from a maximum excavation force angle α1, which is an angle at which the excavation force is maximum with respect to the boom 108. When the arm angle α is present, the lamp 14 is turned on. In this case, as shown in FIG. 9, the controller may determine whether the arm angle α is equal to or greater than the maximum excavation force angle α1 in step S2B.

  Also in the present embodiment configured as described above, the lighting of the lamp 14 can notify the operator that the arm 107 is in a positional relationship with which the excavation force is maximized with respect to the boom 108, and the first embodiment. The same effect can be obtained.

  Although several embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications are possible within the spirit of the present invention.

  For example, in the above-described embodiment, the lamp 14 that is turned on by the output signal from the controller 13 is used as the notification terminal of the notification unit. However, a buzzer that sounds by the output signal from the controller 13 may be used.

  In the above-described embodiment, as a detecting means for detecting the positional relationship of the arm 107 with respect to the boom 106, the angle sensor 11 is attached to the rotation fulcrum 112 between the boom 106 and the arm 107 and the angle of the arm 107 with respect to the boom 106 ( Although the arm angle α) is detected, other angles and displacements may be detected as long as the positional relationship of the arm 107 with respect to the boom 106 can be detected.

  For example, the base end of the arm cylinder 110 that drives the arm 107 is rotatably attached to the back portion of the boom 106 at a rotation fulcrum 113, and the arm cylinder 110 rotates with respect to the boom 106 around the rotation fulcrum 113. The angle changes in conjunction with the arm angle α. Therefore, an angle sensor may be attached to the rotation fulcrum 113 to detect the rotation angle of the arm cylinder 110 with respect to the boom 106. Further, a stroke sensor may be attached to the arm cylinder 110 and the stroke length of the arm cylinder 110 may be detected. Further, a distance sensor or a proximity switch may be provided on the boom 106 or the arm 107 to detect the distance between the boom 106 and the arm 107.

  Further, the pressure sensor 12 for detecting the pressure on the bottom side of the arm cylinder 110 is used as the work load detecting means for detecting the work load when the arm 107 is operated in the arm cloud direction. It may be a pressure sensor that detects.

  Also in the modified example as described above, the same effect as in the first embodiment can be obtained.

It is a figure which shows the excavation work machine (hydraulic excavator) provided with the excavation work support apparatus concerning one embodiment of this invention with a excavation work support apparatus. It is a figure which shows the hydraulic system mounted in the excavation work machine shown in FIG. 1 with a excavation work support apparatus. FIG. 3 is an operation explanatory diagram showing the concept of the arm angle calculated using the detection signal of the angle sensor and the lighting range of the lamp. FIG. 4 is a flowchart showing the processing contents of the controller. It is a figure which shows the detail of the positional relationship of an arm and an arm cylinder when an arm angle turns into a maximum excavation force angle. It is effect | action explanatory drawing which shows the concept of the arm angle and the lighting range of a lamp | ramp in the 2nd Embodiment of this invention. It is a flowchart which shows the processing content of the controller in the 2nd Embodiment of this invention. It is effect | action explanatory drawing which shows the concept of the arm angle and the lighting range of a lamp | ramp in the 3rd Embodiment of this invention. It is a flowchart which shows the processing content of the controller in the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Hydraulic pump 3 Pilot pump 10 Excavation work support apparatus 11 Angle sensor 12 Pressure sensor 13, 13A, 13B Controller 14 Lamp 31-33 Directional switching valve 41-43 Remote control valve 44 Pilot relief valve 46, 47 Control lever 101 Lower part traveling Body 102 Upper swing body 103 Front working device 104 Operator's cab 106 Boom 107 Arm 108 Bucket 109 Boom cylinder 110 Arm cylinder 111 Bucket cylinder 112 Rotation fulcrum 113 Rotation fulcrum 120 Rotation fulcrum

Claims (3)

A lower traveling body, an upper revolving body provided on the lower traveling body so as to be able to swivel, an articulated front working device comprising a boom, an arm, and a bucket provided so as to be able to be lifted and lowered on the upper revolving body; In an excavation work support device for an excavation work machine provided with a boom cylinder, an arm cylinder, and a bucket cylinder that respectively drive an arm and a bucket,
Detecting means for detecting a positional relationship of the arm with respect to the boom;
Workload detection means for detecting a workload when the arm is operated in the arm cloud direction;
Based on the workload and detected by the work load detecting means and the detected positional relationship by said detecting means, said arm positional relationship near Li Kui said workload digging force becomes maximum with respect to the boom drilling operation support apparatus of the excavation work machine, characterized in that the set value or more der Rukoto was a notification means for notifying the operator. In excavation work support apparatus of claim 1 Symbol mounting drilling work machine,
The notification means, before Symbol arm a predetermined angle range near Li Kui the workload more than the set value der Rutoki drilling forces including the small angle between before and after the angle of maximum relative to the boom An excavation work support device for an excavation work machine, characterized by outputting a notification signal. In excavation work support apparatus of claim 1 Symbol mounting drilling work machine,
The notification means, before Symbol arm a predetermined angle range near Li Kui said workload broadcast signal above the set value der Rutoki drilling force is starting or ending point angle that maximizes to the boom Excavation work support device for excavation work machine, characterized in that

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