JP-7854923-B2 - Work machines and work machine support systems

Inventors

• 呉 春男

Assignees

• 住友重機械工業株式会社

Dates

Publication Date

20260507

Application Date

20221115

Claims (6)

1. The control device operated by the operator, Hydraulic actuators and A spool valve that changes the flow rate of hydraulic fluid supplied to the hydraulic actuator, Display device and Equipped with a control device, The spool of the spool valve is displaced according to the amount of operation of the operator, and the opening area of the path through which the hydraulic fluid passes changes according to the amount of spool displacement. The spool valve has the characteristic that the ratio of the increase in the opening area to the increase in the spool displacement is not constant. The control device is a work machine that displays on a display device the correspondence between a physical quantity that depends on the amount of operation of the operator and a physical quantity that depends on the opening area, in relation to the current amount of operation of the operator.
2. The relationship between the physical quantity dependent on the amount of operation of the control and the physical quantity dependent on the opening area is represented by a graph in which one of the horizontal and vertical axes represents the physical quantity dependent on the amount of operation of the control, and the other represents the physical quantity dependent on the opening area. The work machine according to claim 1, which displays on the graph the position corresponding to the current amount of operation of the control element in a recognizable manner.
3. The working machine according to claim 1 or 2, wherein the physical quantity dependent on the amount of operation of the control element is the spool displacement.
4. The working machine according to claim 1 or 2, wherein the physical quantity dependent on the opening area is the size of the opening area or the speed of the rod of the hydraulic actuator.
5. The spool is displaced by a pilot pressure that changes according to the amount of operation of the operator. The working machine according to claim 1 or 2, wherein the control device further displays the relationship between the pilot pressure and the spool displacement amount on the display device in relation to the current operating amount of the operator.
6. A working machine according to claim 1 or 2, The aforementioned work machine communicates with an external device including a display screen, The aforementioned work machine transmits to the external device information defining the correspondence between a physical quantity dependent on the amount of operation of the operator and a physical quantity dependent on the opening area, and information indicating the current amount of operation of the operator. The external device is a work machine support system that displays on the display screen the correspondence between a physical quantity that depends on the amount of operation of the operator and a physical quantity that depends on the opening area, in relation to the current amount of operation of the operator.

Description

This invention relates to a work machine and a work machine support system. In construction machinery such as excavators equipped with hydraulic actuators, a lever operation opens a spool valve, allowing hydraulic fluid to flow into the hydraulic actuator and drive it. Patent Document 1 discloses an excavator capable of improving the operability of the hydraulic actuator. In this excavator, hydraulic fluid flows to the boom control hydraulic cylinder through a boom control valve. The boom control valve has an opening characteristic where the ratio of the increase in opening area to the increase in spool displacement changes at a predetermined point. Japanese Patent Publication No. 2019-168061 Figure 1 is a side view of a shovel according to one embodiment.Figure 2 is a block diagram showing the drive system of the excavator according to the embodiment shown in Figure 1.Figure 3A is a graph illustrating an example of the relationship between pilot pressure and spool displacement, and Figure 3B is a graph illustrating an example of the relationship between spool displacement and opening area.Figure 4 shows an example of an image displayed on a display device by the control device for the excavator according to the embodiment shown in Figure 1.Figure 5 shows an example of an image displayed on a display device by a control device for a work machine, which is a modified example of the embodiment shown in Figure 1.Figure 6 shows an example of an image displayed on a display device by a control device for a work machine according to another modification of the embodiment.Figure 7 shows an example of an image displayed on a display device by a control device for a work machine, which is a further modification of the embodiment.Figure 8 is a block diagram showing the drive system of an excavator according to yet another embodiment.Figure 9 is a schematic diagram of a work machine support system according to yet another embodiment. Referring to Figures 1 to 4, an example of a working machine according to one embodiment will be described using a shovel as an example. Figure 1 is a side view of the excavator according to this embodiment. An upper slewing body 13 is rotatably mounted on the lower traveling body 11 of the excavator 10 via a slewing mechanism 12. A boom 14 is attached to the upper slewing body 13. An arm 15 is attached to the tip of the boom 14, and a bucket 16 is attached to the tip of the arm 15 as an end attachment. The boom 14 is driven by the boom cylinder 17, the arm 15 is driven by the arm cylinder 18, and the bucket 16 is driven by the bucket cylinder 19. Hydraulic cylinders are used as the boom cylinder 17, arm cylinder 18, and bucket cylinder 19. Figure 2 is a block diagram showing the drive system of the excavator 10 according to this embodiment. In Figure 2, the mechanical power transmission system, hydraulic fluid line, pilot line, and electrical control system are indicated by double lines, thick solid lines, thin solid lines, and dashed lines, respectively. The drive system of the excavator 10 includes the engine 21, main pump 24, pilot pump 25, control valve 27, operating device 26, discharge pressure sensor 38, operating pressure sensor 39, control device 40, and display device 42, etc. The engine 21 is, for example, an internal combustion engine, such as a diesel engine, that operates to maintain a predetermined rotational speed. The output shaft of the engine 21 is connected to the input shafts of the main pump 24 and the pilot pump 25, respectively. The main pump 24 supplies hydraulic fluid to the control valve 27 via the hydraulic fluid line. For example, a swashplate type variable displacement hydraulic pump is used as the main pump 24. The pilot pump 25 supplies primary pilot pressure to the operating device 26 via the pilot line. For example, a fixed displacement hydraulic pump is used as the pilot pump 25. The control valve 27 is connected to hydraulic actuators such as the boom cylinder 17, arm cylinder 18, bucket cylinder 19, left travel hydraulic motor 11L, right travel hydraulic motor 11R, and swing hydraulic motor 12A. Single-rod double-acting hydraulic cylinders are used for the boom cylinder 17, arm cylinder 18, and bucket cylinder 19. The control valve 27 includes a plurality of spool valves that control the flow of hydraulic fluid discharged by the main pump 24. These spool valves include, for example, a boom control valve 27A, an arm control valve 27B, a bucket control valve 27C, a left travel motor control valve 27D, a right travel motor control valve 27E, and a swing control valve 27F. The control valve 27 selectively supplies the hydraulic fluid discharged by the main pump 24 to the plurality of hydraulic actuators through the spool valves. The operating device 26 includes multiple control elements 26A operated by the operator, such as operating levers and pedals. The operating device 26 converts the primary pilot pressure supplied from the pilot pump 25 into a secon