Work machine

Abstract

To effectively suppress erroneous operation in touch panel operations in a work machine.SOLUTION: A work machine includes a vehicle body having a cab 10, a work device provided on the vehicle body, an operation device 12 for work and an operation device 13 for travel which are installed in the cab 10 and configured to operate the vehicle body or the work machine, and a touch panel-type display device 15 which is touch-operated by an operator. When the display device 15 is receiving the touch operation, the operation of an actuator for driving the vehicle body or the work device in the work machine is inhibited.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a work machine. [Background technology]

[0002] A hydraulic excavator, which is a typical example of a work machine, generally comprises a self-propelled lower traveling body, an upper rotating body rotatably mounted on the lower traveling body via a rotating device, a work device provided on the upper rotating body, and a number of hydraulic actuators. The hydraulic actuators mounted on the hydraulic excavator are broadly divided into a traveling actuator consisting of a hydraulic motor for traveling provided on the lower traveling body, and a work actuator consisting of a hydraulic motor for rotation provided on the rotating device and a number of hydraulic cylinders provided on the work device. A driver's seat for an operator to sit on is provided on the upper rotating body, and a traveling operation device and a work operation device operated by the operator are provided near the driver's seat. The operation of the various hydraulic actuators is controlled in response to the operator's operation of these operation devices, whereby excavation work, etc., is performed using the hydraulic excavator.

[0003] The driver's seat is provided with a seat on which the operator sits, and the operating devices are arranged around the seat. For example, operating levers for the work operating device are arranged on the left and right sides of the seat, and an operating lever for the travel operating device is arranged in front of the seat. Furthermore, in recent years, work machines having a touch panel type display device (hereinafter simply referred to as a "touch panel") as a device having a function for displaying the state of the work machine and an input function for making various settings for the work machine have also been put into practical use. Such touch panels for work machines are installed in a position that does not impede the operator's entry and exit from the cab and does not increase the blind spot in the operator's direct field of vision while driving, for example, near the right front pillar inside the driver's seat.

[0004] The above touch panel displays information such as the operating status of the vehicle body, such as the remaining fuel level of the hydraulic excavator, engine water temperature, and the presence or absence of errors, as well as the surrounding conditions of the hydraulic excavator. In addition, items that the operator can set using the touch panel include, for example, the selection of the working speed (priority on fuel consumption, priority on working speed, etc.) and the setting of the ML (moment limiter). In recent years, such touch panels for work machines have become increasingly multifunctional. On the other hand, there is a risk that the operator's arm or clothes may get caught on the operation lever of the work operation device installed in front of the touch panel while the operator is concentrating too much on operating the touch panel, which may cause the work machine to malfunction. In particular, an operation (swipe operation) in which a finger is quickly traced on the screen in a specific direction is well known as an operation method specific to touch panels, and since the operator may move his / her arm significantly when performing this operation, unintended erroneous operation of the operation lever is likely to occur.

[0005] Regarding the prevention of malfunctions in a work machine, for example, the technology described in Patent Document 1 is known. Patent Document 1 describes that when the engine is in a driving state and a lever (gate lock lever) that operates a switch that outputs a signal to stop or allow the supply of pressure oil from the hydraulic pump to the drive circuit is in a lowered state, that is, when pressure oil can be supplied from the hydraulic pump to the drive circuit, the operation of a monitor provided on the right front of the driver's seat is disabled. This eliminates the need for the operator to operate the monitor, suppressing the occurrence of malfunctions as described above. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2018-48530 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the method described in Patent Document 1, if the operator does not correctly recognize that monitor operation is disabled when the gate lock lever is lowered, the operator may mistakenly try to operate the monitor, which may result in the operator's arm or clothing coming into contact with the operating lever and causing a malfunction. Thus, the technology in Patent Document 1 was insufficient to effectively prevent malfunctions when operating a touch panel on a work machine.

[0008] The present invention has been made in consideration of the above-mentioned points, and an object of the present invention is to effectively suppress malfunctions when operating a touch panel in a work machine. [Means for solving the problem]

[0009] The work machine according to the present invention is a work machine comprising a vehicle body having a driver's seat, a work device provided on the vehicle body, an operation device installed on the driver's seat and for operating the vehicle body or the work device, and a touch panel type display device that is operated by an operator through touch, and when the display device is accepting touch operation, operation of an actuator that drives the vehicle body or the work device is prohibited. Effect of the Invention

[0010] According to the present invention, malfunctions occurring when operating a touch panel in a work machine can be effectively suppressed.

[0011] Further features related to the present invention will become apparent from the description of the present specification and the accompanying drawings. In addition, problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0012] [Figure 1] 1 is an external view of a hydraulic excavator, which is an example of a work machine according to an embodiment of the present invention. [Diagram 2] A diagram showing the inside of the cab. [Diagram 3]FIG. 1 is a diagram showing an example of a system configuration of a hydraulic excavator. [Figure 4] FIG. 2 is a diagram showing a control flow according to the first embodiment of the present invention. [Diagram 5] 11A and 11B are diagrams showing examples of erroneous operation of the operation lever during a touch operation by an operator. [Figure 6] FIG. 11 is a diagram showing a control flow according to a second embodiment of the present invention. [Figure 7] FIG. 11 is a diagram showing a control flow according to a third embodiment of the present invention. [Figure 8] FIG. 13 is a diagram showing a control flow according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a work machine according to the present invention will be described in detail with reference to the accompanying drawings, taking a hydraulic excavator as an example.

[0014] (First embodiment) Fig. 1 is an external view of a hydraulic excavator, which is an example of a work machine according to an embodiment of the present invention. The hydraulic excavator 1 shown in Fig. 1 has a vehicle body composed of a lower traveling body 2 equipped with a pair of left and right traveling motors 2A and crawlers 2B, and an upper rotating body 4 rotatably provided on the lower traveling body 2 via a rotating device 3.

[0015] The lower traveling body 2 can travel on rough ground by driving the left and right crawlers 2B with a traveling motor 2A, which is a hydraulic actuator for traveling. The turning device 3 is operated by a turning motor (not shown), which is a hydraulic actuator for turning, and turns the upper turning body 4 relative to the lower traveling body 2 in any direction to the left or right.

[0016] A working device 5 consisting of a boom 5A, an arm 5B, and a bucket 5C is provided on the front side of the upper rotating body 4. The boom 5A is driven by a pair of left and right boom cylinders 6A, the arm 5B is driven by an arm cylinder 6B, and the bucket 5C is driven by a bucket cylinder 6C. In other words, the hydraulic cylinders 6 (boom cylinder 6A, arm cylinder 6B, and bucket cylinder 6C), which are hydraulic actuators for work, are each driven to extend and retract, thereby driving the working device 5 and performing work such as excavating earth and sand.

[0017] In addition, a cab 10 which is a driver's seat for an operator is provided on the upper rotating body 4. The operator operates the hydraulic excavator 1 while sitting in the cab 10.

[0018] 2 is a diagram showing the inside of the cab 10. A seat 11 on which an operator sits when boarding the hydraulic excavator 1 is disposed in approximately the center of the cab 10. The operator operates the hydraulic excavator 1 while seated on this seat 11.

[0019] On the left and right front of the seat 11, work operation devices 12 for operating the upper rotating body 4 and the working device 5 are installed. The work operation devices 12 are composed of a right operation lever 12A and a left operation lever 12B. An operator seated on the seat 11 can control the operation of each hydraulic cylinder 6 attached to the working device 5 and the rotating device 3 by grasping the right operation lever 12A and the left operation lever 12B and tilting them in any direction, thereby operating the working device 5 and the upper rotating body 4.

[0020] The correspondence between the operation directions of the operation levers 12A, 12B of the work operation device 12 and the operation contents of the work device 5 and the upper rotating body 4 can be determined according to any operation setting pattern. For example, an operation setting pattern can be determined so that forward / backward operation of the right operation lever 12A corresponds to the up / down movement of the boom 5A and left / right operation corresponds to the opening / closing movement of the bucket 5C, and forward / backward operation of the left operation lever 12B corresponds to the left / right swing movement of the upper rotating body 4 and left / right operation corresponds to the opening / closing movement of the arm 5B. Note that the correspondence between each operation lever and the operation contents in the operation setting pattern is one example, and other correspondences may be used.

[0021] In addition, a traveling operation device 13 for operating the lower traveling body 2 is installed in front of the seat 11. The traveling operation device 13 is composed of a right operation lever 13A and a left operation lever 13B. An operator seated on the seat 11 can control the operation of a pair of left and right traveling motors 2A by grasping the right operation lever 13A and the left operation lever 13B and tilting them in either the forward or backward direction, respectively, thereby operating the lower traveling body 2. For example, when the operation lever 13A is tilted forward, the right traveling motor 2A is operated so that the right crawler 2B rotates in the forward direction, and when the operation lever 13A is tilted backward, the right traveling motor 2A is operated so that the right crawler 2B rotates in the backward direction. Similarly, when the operation lever 13B is tilted forward, the left crawler 2B rotates in the forward direction, and when the operation lever 13B is tilted backward, the left traveling motor 2A is operated so that the left crawler 2B rotates in the backward direction.

[0022] Furthermore, a shutoff lever 14 for releasing or locking the output of pilot pressure from the pilot pressure generating solenoid valve 22 (see FIG. 3) is provided on the left side of the seat 11. The shutoff lever 14 can be selected to either the release position or the lock position by the operator. When the shutoff lever 14 is in the release position, the output of pilot pressure is released (permitted), and each hydraulic actuator (travel motor 2A, swing motor, hydraulic cylinder 6) of the hydraulic excavator 1 is allowed to operate in response to the operation of the work operation device 12 and the traveling operation device 13. On the other hand, when the shutoff lever 14 is in the lock position, the output of pilot pressure is locked (prohibited), and each hydraulic actuator of the hydraulic excavator 1 cannot operate even if the work operation device 12 and the traveling operation device 13 are operated.

[0023] A windshield 16 is provided at the front of the cab 10 so that the operator can see ahead from within the cab 10. A touch panel display device (hereinafter simply referred to as the display device) 15 is provided near the pillar 10A on the right side of the windshield 16. This display device 15 displays various information relating to the setting and operating states of the hydraulic excavator 1, and allows the operator to input operations by touching the display device 15. The operator can check the setting and operating states of the hydraulic excavator 1 by checking the contents displayed on the display device 15, and can also change the contents as desired by touching the display device.

[0024] 2, the operation lever 12A on the right side of the work operation device 12 is disposed in front of the seat 11, between the seat 11 and the display device 15. Therefore, when the operator sits on the seat 11 and stretches out his / her right arm to perform a touch operation on the display device 15 with the fingertips of his / her right hand, part of the right arm may come into contact with the operation lever 12A, resulting in an unintended operation of the work operation device 12. If the shutoff lever 14 is in the release position at this time, the work device 5 or the upper rotating body 4 may perform an unexpected operation, which may pose a danger to the surroundings.

[0025] Therefore, in this embodiment, when the display device 15 accepts a touch operation by the operator, operation of each hydraulic actuator of the hydraulic excavator 1 is prohibited regardless of the position of the shutoff lever 14. In other words, even if the shutoff lever 14 is in the release position rather than the locked position, the output of pilot pressure is locked during the operator's touch operation in the same way as when it is in the locked position, and each hydraulic actuator of the hydraulic excavator 1 cannot be operated even if the work operation device 12 or the traveling operation device 13 is operated. This prevents the hydraulic excavator 1 from performing an unexpected operation even if the operator unintentionally touches the operation lever 12A during a touch operation. The specific control method at this time will be described later.

[0026] FIG. 3 is a diagram showing an example of a system configuration of the hydraulic excavator 1.

[0027] The work operation device 12 and the traveling operation device 13 electrically measure the amount of tilt of each operation lever and transmit the amount of tilt to the vehicle body controller 21. The vehicle body controller 21 drives the pilot pressure generating solenoid valve 22 in accordance with the amount of tilt of each operation lever of the work operation device 12 and the traveling operation device 13.

[0028] A pilot pump 23 is connected to the pilot pressure generating solenoid valve 22. The pilot pump 23 discharges hydraulic oil supplied from a hydraulic oil tank 24 to a control valve 25 via the pilot pressure generating solenoid valve 22. As a result, a pilot pressure corresponding to the tilt amount of each operating lever is supplied to the control valve 25.

[0029] Main pumps 26A, 26B are connected to the control valve 25. The main pumps 26A, 26B discharge hydraulic oil supplied from the hydraulic oil tank 24 to each hydraulic actuator (travel motor 2A, swing motor, hydraulic cylinder 6) via the control valve 25. The discharge flow rate to each hydraulic actuator at this time is controlled according to the pilot pressure supplied from the pilot pressure generating solenoid valve 22 to the control valve 25. As a result, each hydraulic actuator operates according to the amount of tilt of each operating lever.

[0030] The pilot pump 23 and the main pumps 26A, 26B are driven by an engine 27 mounted on the body of the hydraulic excavator 1. Instead of the engine 27, which is an internal combustion engine, the pilot pump 23 and the main pumps 26A, 26B may be driven by an electric motor.

[0031] The shutoff lever 14 transmits a signal relating to its own operating position to the vehicle body controller 21. The vehicle body controller 21 determines whether the shutoff lever 14 is in the release position or the lock position based on the signal from the shutoff lever 14, and if it is in the lock position, it blocks the output of pilot pressure from the pilot pressure generating solenoid valve 22. As a result, when the shutoff lever 14 is in the lock position, even if the operator operates the work operation device 12 or the traveling operation device 13, the control valve 25 does not operate, and therefore no hydraulic oil is supplied to the hydraulic actuators. Therefore, regardless of the operating state of the work operation device 12 or the traveling operation device 13, the operation of each hydraulic actuator can be inhibited.

[0032] The display device 15 performs two-way communication with the vehicle body controller 21 to display information about the hydraulic excavator 1 managed by the vehicle body controller 21, such as information about the setting state and operating state of the hydraulic excavator 1, and can present this to the operator. Information input by the operator by touching the display device 15 is transmitted from the display device 15 to the vehicle body controller 21 and is reflected in the information about the hydraulic excavator 1 managed by the vehicle body controller 21.

[0033] Next, a control process of the pilot pressure generating solenoid valve 22 that is carried out in the vehicle body controller 21 when the operator operates the work operation device 12 or the travel operation device 13 will be described.

[0034] As described above, when the shutoff lever 14 is in the release position, the vehicle body controller 21 controls the operation of the pilot pressure generating solenoid valve 22 in accordance with the amount of tilt of each operation lever of the work operation device 12 and the traveling operation device 13. On the other hand, when the shutoff lever 14 is in the lock position, the output of pilot pressure by the pilot pressure generating solenoid valve 22 is blocked.

[0035] In addition to the above-mentioned controls, the vehicle body controller 21 of this embodiment controls the pilot pressure generating solenoid valve 22 in accordance with the state of the operator's touch operation on the display device 15. In other words, when the operator is performing a touch operation on the display device 15 and the display device 15 accepts the touch operation, the vehicle body controller 21 controls the pilot pressure generating solenoid valve 22 so as to prohibit the operation of each hydraulic actuator of the hydraulic excavator 1, regardless of the position of the shutoff lever 14. A specific example of this control will be described below with reference to the flowchart in FIG.

[0036] 4 is a diagram showing a control flow according to the first embodiment of the present invention. In this embodiment, when the vehicle body controller 21 detects that the work operation device 12 or the traveling operation device 13 has been operated, the vehicle body controller 21 performs processing according to the control flow in FIG.

[0037] In step S10, the vehicle body controller 21 determines whether or not the position of the shutoff lever 14 is the lock position. If the result of the determination in step S10 is that the shutoff lever 14 is in the lock position, the process proceeds to step S40, and if the shutoff lever 14 is not in the lock position, i.e., if it is in the release position, the process proceeds to step S20.

[0038] In step S20, the vehicle body controller 21 judges whether or not the input to the display device 15 is recognized. If the judgment result in step S20 is that the input to the display device 15 is recognized, that is, if the operator has performed some kind of touch operation on the display device 15 and the display device 15 has accepted the touch operation, the process proceeds to step S40. On the other hand, if the input to the display device 15 is not recognized, that is, if the operator has not performed a touch operation on the display device 15 and the display device 15 has not accepted the touch operation, the process proceeds to step S30.

[0039] In step S30, the vehicle body controller 21 permits the output of pilot pressure by the pilot pressure generating solenoid valve 22. At this time, the vehicle body controller 21 detects the amount of tilt of each operation lever based on signals transmitted from, for example, the work operation device 12 and the traveling operation device 13, and determines the operation amount of each hydraulic actuator corresponding to the operation state of each operation lever according to a predetermined operation setting pattern. Then, the vehicle body controller 21 drives each valve in the pilot pressure generating solenoid valve 22 so as to achieve an opening degree corresponding to the operation amount of each hydraulic actuator determined. As a result, pilot pressure corresponding to the operation state of the work operation device 12 and the traveling operation device 13 is output from the pilot pressure generating solenoid valve 22 to the control valve 25 for each hydraulic actuator of the hydraulic excavator 1, and as a result, the hydraulic excavator 1 operates in accordance with the operation input by the operator.

[0040] After performing the process of step S30, the vehicle body controller 21 returns to step S10 and repeats the above-mentioned process.

[0041] In step S40, the vehicle body controller 21 prohibits the output of pilot pressure by the pilot pressure generating solenoid valve 22. At this time, the vehicle body controller 21, for example, does not send a drive command to the pilot pressure generating solenoid valve 22, and all valves are closed. As a result, pilot pressure is not output from the pilot pressure generating solenoid valve 22 to the control valve 25, regardless of the operation state of the work operation device 12 and the traveling operation device 13, and as a result, the hydraulic excavator 1 is prevented from operating. In other words, the operation of each hydraulic actuator can be prohibited.

[0042] After performing the process of step S40, the vehicle body controller 21 returns to step S10 and repeats the above-mentioned process.

[0043] 5 is a diagram showing an example of an erroneous operation of the operation lever during a touch operation by an operator. In FIG. 5, (a) is a plan view and (b) is a side view showing an example of a state in which an operator 30 operates the display device 15 while seated on the seat 11.

[0044] The operator 30 sits on the seat 11, stretches out his right arm 31, and touches the display device 15 with the fingertips of his right hand to perform input work on the display device 15. At this time, the operator 30 is watching the display device 15, so the operator 30 may not pay attention to the operation lever 12A on the right side of the work operation device 12 until the right arm 31 touches the operation lever 12A. In particular, as an operation method specific to a touch panel, there is an operation (swipe operation) in which a finger is quickly traced in a specific direction on the screen, and when the operator 30 performs this operation on the display device 15, the right arm 31 moves significantly and is likely to come into contact with the operation lever 12A. In such a case, if the shutoff lever 14 is in the release position, in a conventional control method to which the present invention is not applied, the operation lever 12A may fall in an unintended direction due to the contact of the right arm 31, causing the work device 5 to operate unexpectedly.

[0045] On the other hand, according to this embodiment, as described in the flowchart of Fig. 4, while it is recognized that a touch operation is being performed on the display device 15 (step S20: Yes), the vehicle body controller 21 prevents pilot pressure from being output from the pilot pressure generating solenoid valve 22 to the control valve 25 (step S40), regardless of the operation state of the work operation device 12 and the traveling operation device 13. This makes it possible to prevent the work device 5 from operating unexpectedly even if the operation lever 12A is tilted in an unintended direction due to contact with the right arm 31 while the operator 30 is performing an input operation on the display device 15.

[0046] According to the first embodiment of the present invention described above, the hydraulic excavator 1, which is a working machine, includes a vehicle body having a cab 10, a working device 5 provided on the vehicle body, a working operation device 12 and a traveling operation device 13 that are installed on the cab 10 and operate the vehicle body or the working device 5 of the hydraulic excavator 1, and a touch panel type display device 15 that is touch-operated by an operator. In this hydraulic excavator 1, when the display device 15 accepts a touch operation (step S20: Yes), the vehicle body controller 21 prohibits the operation of the traveling motor 2A, the swing motor, and the hydraulic cylinder 6, which are actuators that drive the vehicle body or the working device 5 of the hydraulic excavator 1 (step S40). This makes it possible to effectively suppress malfunctions during touch panel operation in a working machine such as the hydraulic excavator 1.

[0047] Second Embodiment Next, a second embodiment of the present invention will be described. In this embodiment, an example will be described in which the operation of each hydraulic actuator of the hydraulic excavator 1 is prohibited not only while the operator is performing a touch operation on the display device 15, but also within a predetermined time after the touch operation.

[0048] The configuration of the hydraulic excavator and the configurations and arrangements of each operating device in this embodiment are similar to those in the first embodiment. Therefore, in the following, this embodiment will be described based on the configuration of the hydraulic excavator 1 described in the first embodiment.

[0049] 6 is a diagram showing a control flow according to the second embodiment of the present invention. In this embodiment, when the vehicle body controller 21 detects that the work operation device 12 or the traveling operation device 13 has been operated, the vehicle body controller 21 performs processing according to the control flow in FIG.

[0050] In steps S10A and S20A, the vehicle body controller 21 performs the same processes as steps S10 and S20 in the control flow of Fig. 4 described in the first embodiment. If the result of the determination in step S20A is that the input of the display device 15 is recognized, that is, if the operator has performed some kind of touch operation on the display device 15 and the display device 15 has accepted the touch operation, the process proceeds to step S21. On the other hand, if the input of the display device 15 is not recognized, that is, if the operator has not performed a touch operation on the display device 15 and the display device 15 has not accepted the touch operation, the process proceeds to step S22.

[0051] In step S21, the vehicle body controller 21 sets an input flag indicating that a touch operation has been performed on the display device 15. The input flag set in step S21 is held for a predetermined time in the vehicle body controller 21 and then released. Note that the holding time of this input flag is preferably set according to the time from when the operator completes the touch operation of the display device 15 until he or she resumes operation of the work operation device 12 or the traveling operation device 13. Once the input flag has been set in step S21, proceed to step S40A.

[0052] In step S22, the vehicle body controller 21 judges whether the input flag is set. If the input flag is set, that is, if the operator touches the display device 15 to perform a touch operation and if the predetermined time has not elapsed since the display device 15 last recognized the touch operation acceptance in step S20A, the process proceeds to step S40A. On the other hand, if the input flag is not set, that is, if the predetermined time has elapsed since the operator's touch panel operation on the display device 15 was last recognized and the display device 15 stopped accepting the touch operation, the process proceeds to step S30A.

[0053] In steps S30A and S40A, the vehicle body controller 21 performs the same processes as steps S30 and S40 in the control flow of Fig. 4 described in the first embodiment. After performing the processes of steps S30A and S40A, the vehicle body controller 21 returns to step S10A and repeats the above-mentioned processes.

[0054] According to the second embodiment of the present invention described above, the vehicle body controller 21 prohibits the actuator from operating (step S40A) when the display device 15 is accepting a touch operation (step S20A: Yes) and for a predetermined time after the display device 15 has finished accepting the touch operation (step S22: Yes). This makes it possible to avoid unexpected operation of the working device 5 due to unintentional contact with the operation lever 12A disposed in front of the display device 15 not only while the operator is actually performing a touch operation on the display device 15, but also during the time until the operator returns to his / her original position to resume operation of the working operation device 12 or the traveling operation device 13 after the completion of the touch operation. Therefore, it is possible to more effectively suppress malfunctions during touch panel operation in a working machine such as the hydraulic excavator 1.

[0055] (Third embodiment) Next, a third embodiment of the present invention will be described. In this embodiment, an example will be described in which the hydraulic excavator 1 is prevented from suddenly stopping when an operator performs a touch operation on the display device 15 while the hydraulic excavator 1 is traveling.

[0056] The configuration of the hydraulic excavator and the configurations and arrangements of each operating device in this embodiment are also similar to those in the first embodiment. Therefore, in the following, this embodiment will be described based on the configuration of the hydraulic excavator 1 described in the first embodiment.

[0057] 7 is a diagram showing a control flow according to the third embodiment of the present invention. In this embodiment, when the vehicle body controller 21 detects that the work operation device 12 or the traveling operation device 13 has been operated, the vehicle body controller 21 performs processing according to the control flow in FIG.

[0058] In steps S10B and S20B, the vehicle body controller 21 performs the same processes as steps S10 and S20 in the control flow of Fig. 4 described in the first embodiment. If the result of the determination in step S20B is that the input of the display device 15 is recognized, that is, if the operator has performed some kind of touch operation on the display device 15 and the display device 15 has accepted the touch operation, the process proceeds to step S23. On the other hand, if the input of the display device 15 is not recognized, that is, if the operator has not performed a touch operation on the display device 15 and the display device 15 has not accepted the touch operation, the process proceeds to step S30B.

[0059] In step S23, vehicle body controller 21 determines whether the operation input detected at the start of the control flow is an operation of work operation device 12. If it is an operation of work operation device 12, that is, if the operator operates work operation device 12, and the operator performs a touch operation on display device 15 and display device 15 accepts the touch operation, the process proceeds to step S40B. On the other hand, if it is not an operation of work operation device 12, that is, if the operator operates traveling operation device 13, and the operator performs a touch operation on display device 15 and display device 15 accepts the touch operation, the process proceeds to step S30B.

[0060] In steps S30B and S40B, the vehicle body controller 21 performs the same processes as steps S30 and S40 in the control flow of Fig. 4 described in the first embodiment. After performing the processes of steps S30B and S40B, the vehicle body controller 21 returns to step S10B and repeats the above-mentioned processes.

[0061] According to the third embodiment of the present invention described above, when the traveling operation device 13 is operated and the display device 15 accepts a touch operation (step S20B: Yes, step S23: No), the vehicle body controller 21 permits the actuator to operate (step S30B). Specifically, as shown in Fig. 5, for example, the traveling operation device 13 that operates the traveling motor 2A that is a traveling actuator for traveling the vehicle body of the hydraulic excavator 1 is disposed to the side of the display device 15, and the work operation device 12 that operates the hydraulic cylinder 6 that is a work actuator for driving the work device 5 is disposed between the seat 11 on which the operator sits and the display device 15 in the cab 10. Then, when the display device 15 accepts a touch operation when the traveling operation device 13 is operated (step S20B: Yes, step S23: No), the vehicle body controller 21 permits the operation of the traveling motor 2A (step S30B), and when the display device 15 accepts a touch operation when the work operation device 12 is operated (step S20B: Yes, step S23: Yes), the vehicle body controller 21 prohibits the operation of the hydraulic cylinder 6 (step S40B). As a result, it is possible to prevent the erroneous operation of the work device 5 during the touch operation of the display device 15, while allowing the hydraulic excavator 1 to continue traveling even if a touch operation is performed during the operation of the traveling operation device 13. As a result, even if the operator operates the display device 15 during the traveling of the hydraulic excavator 1 in rainy weather, for example, to operate a wiper (not shown) provided on the cab 10, it is possible to avoid a sudden stop of the traveling of the hydraulic excavator 1 and a decrease in work efficiency. Therefore, in a work machine such as the hydraulic excavator 1, it is possible to effectively suppress erroneous operation during touch panel operation without impairing availability.

[0062] (Fourth embodiment) Next, a fourth embodiment of the present invention will be described. In this embodiment, an example will be described in which, when the operator touches the display device 15 to prohibit the operation of each hydraulic actuator of the hydraulic excavator 1, the operator is made aware of this, thereby preventing the operator from being confused.

[0063] The configuration of the hydraulic excavator and the configurations and arrangements of each operating device in this embodiment are also similar to those in the first embodiment. Therefore, in the following, this embodiment will be described based on the configuration of the hydraulic excavator 1 described in the first embodiment.

[0064] 8 is a diagram showing a control flow according to the fourth embodiment of the present invention. In this embodiment, when the vehicle body controller 21 detects that the work operation device 12 or the traveling operation device 13 has been operated, the vehicle body controller 21 performs processing according to the control flow in FIG.

[0065] In steps S10C and S20C, the vehicle body controller 21 performs the same processes as steps S10 and S20 in the control flow of Fig. 4 described in the first embodiment. If the result of the determination in step S20C is that the input of the display device 15 is recognized, that is, if the operator has performed some kind of touch operation on the display device 15 and the display device 15 has accepted the touch operation, the process proceeds to step S24. On the other hand, if the input of the display device 15 is not recognized, that is, if the operator has not performed a touch operation on the display device 15 and the display device 15 has not accepted the touch operation, the process proceeds to step S30C.

[0066] In step S24, the vehicle body controller 21 causes the display device 15 to display a warning. Here, the vehicle body controller 21 transmits a command to display a predetermined warning screen to the display device 15. This warning screen includes, for example, a display content indicating that the erroneous operation prevention function according to the present invention is working and therefore the operation input of the work operation device 12 or the traveling operation device 13 is not accepted, and a display content indicating that a touch operation of the display device 15 is being performed with the shutoff lever 14 in the release position. By displaying a warning screen including these display contents on the display device 15, it is possible to call the attention of the operator. After the warning display by the display device 15 is performed in step S24, the process proceeds to step S40C.

[0067] In steps S30C and S40C, the vehicle body controller 21 performs the same processes as steps S30 and S40 in the control flow of Fig. 4 described in the first embodiment. After performing the processes of steps S30C and S40C, the vehicle body controller 21 returns to step S10C and repeats the above-mentioned processes.

[0068] According to the fourth embodiment of the present invention described above, the hydraulic excavator 1 is provided with a shutoff lever 14 that can select either the release position or the lock position according to the operation of the operator, and in the release position, allows the actuators to be operated by the work operation device 12 and the traveling operation device 13, and in the lock position, prohibits the actuators to be operated by the work operation device 12 and the traveling operation device 13. When the shutoff lever 14 is in the release position, and the display device 15 receives the touch operation by performing a touch operation on the display device 15 (step S20C: Yes), the vehicle body controller 21 displays a predetermined warning on the display device 15 (step S24). As described above, when the shutoff lever 14 is in the release position and the operator unintentionally tilts the operation lever 12A of the work operation device 12 while performing a touch operation on the display device 15, the operation of the work device 5 can be stopped and the operator can be informed of the reason. Therefore, in a work machine such as the hydraulic excavator 1, it is possible to effectively suppress malfunctions during touch panel operation, prevent confusion of the operator, and improve ease of use.

[0069] In each of the first to fourth embodiments described above, an example has been described in which the output of pilot pressure is prohibited and the operation of the working device 5 is stopped when the display device 15 is touched. However, the hydraulic excavator 1 may be equipped with a physical operation switch such as a button or a knob in addition to the touch panel type display device 15. When the same operation instruction as the touch operation of the display device 15 is given to the working device 5 by such an operation switch, the operation switch may allow the output of pilot pressure to operate the working device 5, while the touch operation of the display device 15 may prohibit the output of pilot pressure to stop the operation of the working device 5. Alternatively, the output of pilot pressure may be prohibited and the operation of the working device 5 may be stopped regardless of whether the operation switch or touch operation is used.

[0070] In each of the first to fourth embodiments described above, the operation of each hydraulic actuator is stopped by prohibiting the pilot pressure generating solenoid valve 22 from outputting the pilot pressure, thereby stopping the operation of the hydraulic excavator 1. However, the operation of the hydraulic excavator 1 may be stopped by other methods. For example, the signals from the work operation device 12 and the traveling operation device 13 to the vehicle body controller 21 may be stopped to prevent the hydraulic actuators from operating regardless of the operation state of these devices. Also, in a work machine equipped with an electric actuator instead of a hydraulic actuator, the operation of the electric actuator may be stopped. In addition to this, it is possible to stop the operation of the work machine during the touch panel operation by any method to suppress malfunction.

[0071] Although the embodiments of the present invention have been described above in detail, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention described in the claims. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those having all of the configurations described. In addition, it is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration. [Explanation of symbols]

[0072] 1: Hydraulic excavator 2: Lower running body 2A: Driving motor 3: Swivel device 4: Upper rotating body 5: Working equipment 5A: Boom 5B: Arm 5C: Bucket 6: Hydraulic cylinder 6A: Boom cylinder 6B: Arm cylinder 6C: Bucket cylinder 10: Cab 11: Sheet 12: Work operation device 13: Driving operation device 14:Shut-off lever 15:Display device 21: Vehicle controller (control device)

Claims

1. A vehicle body having a driver's seat; A working device provided on the vehicle body; An operating device that is installed in the driver's seat and operates the vehicle body or the working device; A work machine equipped with a touch panel type display device that is touch-operated by an operator, When the display device receives a touch operation, the operation of an actuator that drives the vehicle body or the working device is prohibited. A working machine characterized by:

2. 2. The work machine according to claim 1, The actuator is inhibited from operating while the display device is accepting the touch operation and for a predetermined time after the display device has finished accepting the touch operation. A working machine characterized by:

3. 3. The working machine according to claim 1 or 2, The actuators include a traveling actuator for traveling the vehicle body and a working actuator for driving the working device, the operation device includes a traveling operation device that operates the traveling actuator, and a work operation device that operates the work actuator, The traveling operation device is disposed to the side of the display device, The work operation device is disposed in the driver's seat between a seat on which the operator sits and the display device, permitting operation of the actuator for traveling when the display device has accepted the touch operation when the operating device for traveling is operated; When the work operation device is operated, if the display device accepts the touch operation, the operation of the work actuator is prohibited. A working machine characterized by:

4. 3. The working machine according to claim 1 or 2, a shutoff lever that is selectable between a release position and a lock position in response to an operation by the operator, and that allows operation of the actuator by the operating device in the release position and prohibits operation of the actuator by the operating device in the lock position; When the shutoff lever is in the release position, if the display device receives the touch operation, a predetermined warning display is performed on the display device. A working machine characterized by:

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