Work machine and abnormality detection for pin position detection device

1 . A work machine comprising:

a plurality of booms that are telescoped with telescopic cylinders;

a first pin capable of transitioning between an in-state in which the boom and the telescopic cylinder are connected and an out-state in which a connection of the boom and the telescopic cylinder is released;

a second pin capable of transitioning between an in-state in which adjacent booms are connected and an out-state in which a connection of the adjacent booms is released;

a main-detection device and a sub-detection device that are able to detect a combination of the states of the first pin and the second pin; and

a control unit that controls a telescopic movement of the boom on a basis of a detection result of the main-detection device,

wherein the control unit controls ON/OFF of a first flag indicating whether or not the main-detection device was able to detect the combination and ON/OFF of a second flag indicating whether or not the sub-detection device was able to detect the combination during the telescopic movement of the boom and detects that an abnormality has occurred in the main-detection device and the sub-detection device on a basis of the first flag and the second flag,

wherein the control unit compares the first flag with the second flag, and specifies an abnormal detection device in which the abnormality has occurred among the main-detection device and the sub-detection device,

wherein the combination of the states of the first pin and the second pin includes

a first set in which the first pin is the in-state and the second pin is the in-state,

a second set in which the first pin is the in-state and the second pin is the out-state, and

a third set in which the first pin is the out-state and the second pin is the in-state,

wherein the first flag includes three first flag elements corresponding to the first set, the second set, and the third set,

wherein the second flag includes three second flag elements corresponding to the first set, the second set, and the third set, and

wherein when all the flag elements of one flag of the first flag and the second flag are turned on, the control unit compares the first flag with the second flag to specify the abnormal detection device.

2 . The work machine according to claim 1 ,

wherein in the comparison,

the control unit determines that no abnormality has occurred when all the flag elements of the other flag of the first flag and the second flag are turned on and

determines that the abnormality has occurred in the detection device corresponding to the other flag of the first flag and the second flag when all the flag elements of the other flag of the first flag and the second flag are not turned on.

3 . The work machine according to claim 1 ,

wherein the control unit performs self-check control to transition a state of the first pin and/or the second pin without telescoping the boom in a predetermined state, controls ON/OFF of the first flag and the second flag during the self-check control, and specifies the abnormal detection device on the basis of the first flag and the second flag.

4 . The work machine according to claim 3 ,

wherein the predetermined state includes a non-load state in which a load of the boom does not act on the second pin or a telescopic cylinder total contraction state in which the telescopic cylinder is in a total contraction state.

5 . The work machine according to claim 1 ,

wherein the control unit

detects that the abnormality has occurred in the main-detection device when an output of the main-detection device does not satisfy a first predetermined condition,

detects that the abnormality has occurred in the sub-detection device when an output of the sub-detection device does not satisfy a second predetermined condition,

controls the telescopic movement of the boom on a basis of a detection result of the sub-detection device when the abnormality has occurred in the main-detection device and no abnormality has occurred in the sub-detection device, and

stops a control of the telescopic movement of the boom when the abnormality has occurred in the main-detection device and the sub-detection device.

6 . The work machine according to claim 1 ,

wherein when a detection result of the main-detection device and a detection result of the sub-detection device do not match, the control unit detects that the abnormality has occurred in any one of the main-detection device and the sub-detection device.

7 . The work machine according to claim 1 ,

wherein the main-detection device and the sub-detection device detect the combination by different detection methods.

8 . The work machine according to claim 1 ,

wherein the main-detection device includes a potentiometer, and detects the combination on a basis of a voltage value that is an output of the potentiometer, and

wherein the sub-detection device includes three proximity sensors, and detects the combination on a basis of a combination of detection values of the three proximity sensors.

9 . The work machine according to claim 1 ,

wherein the control unit causes a display unit to display an image indicating states of the first pin and the second pin corresponding to a detection result of the main-detection device and an image indicating states of the first pin and the second pin corresponding to a detection result of the sub-detection device.

10 . A work machine comprising:

a plurality of booms that are telescoped with telescopic cylinders;

a first pin capable of transitioning between an in-state in which the boom and the telescopic cylinder are connected and an out-state in which a connection of the boom and the telescopic cylinder is released;

a second pin capable of transitioning between an in-state in which adjacent booms are connected and an out-state in which a connection of the adjacent booms is released;

a main-detection device and a sub-detection device that are able to detect a combination of the states of the first pin and the second pin; and

a control unit that controls a telescopic movement of the boom on a basis of a detection result of the main-detection device,

wherein the control unit controls ON/OFF of a first flag indicating whether or not the main-detection device was able to detect the combination and ON/OFF of a second flag indicating whether or not the sub-detection device was able to detect the combination during the telescopic movement of the boom and detects that an abnormality has occurred in the main-detection device and the sub-detection device on a basis of the first flag and the second flag,

wherein the control unit compares the first flag with the second flag, and specifies an abnormal detection device in which the abnormality has occurred among the main-detection device and the sub-detection device, and

wherein the control unit performs self-check control to transition a state of the first pin and/or the second pin without telescoping the boom in a predetermined state, controls ON/OFF of the first flag and the second flag during the self-check control, and specifies the abnormal detection device on the basis of the first flag and the second flag.