Work equipment

Abstract

The present invention provides a work machine that can take appropriate action depending on whether the protective mechanism is enabled or disabled. [Solution] The work machine 1 comprises a traveling device 10, a slewing body 2A supported on the traveling device 10 so as to be rotatable around a vertical axis, a driver's seat 4 provided on the slewing body 2A, a protective mechanism 6 that can be displaced between an effective state and an ineffective state other than the effective state, which can protect the driver seated in the driver's seat 4, and a first detection device 80 that detects the effective state and the ineffective state of the protective mechanism 6.

Description

Technical Field

[0001] The present invention relates to a working machine such as a backhoe.

Background Art

[0002] Patent Document 1 discloses a working vehicle (tractor) in which a rollover protective structure (protective mechanism) for protecting a driver is erected on the vehicle body. This rollover protective structure is divided and formed into a lower divided body located on the vehicle body side and an upper divided body located on the upper side, and the upper divided body is supported to be rotatable relative to the lower divided body between a vertical operating posture and a folded posture bent downward. The vertical operating posture of the rollover protective structure is a state (valid state) that protects the driver. On the other hand, the folded posture of the rollover protective structure is a state (invalid state) that cannot protect the driver.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the working vehicle of Patent Document 1, although the protective mechanism (rollover protective structure) can be displaced between the vertical operating posture and the folded posture, the state of the protective mechanism (vertical operating posture or folded posture) cannot be detected, so that measures corresponding to the valid state (vertical operating posture) and the invalid state (folded posture) of the protective mechanism cannot be taken.

[0005] The present invention has been made to solve the problems of the related art, and an object of the present invention is to provide a working machine capable of taking measures corresponding to the valid state and the invalid state of a protective mechanism.

Means for Solving the Problem

[0006] A work machine according to one aspect of the present invention comprises a traveling device, a slewing body rotatably supported on the traveling device around a vertical axis, a driver's seat provided on the slewing body, a protective mechanism that can be displaced between an effective state and an ineffective state other than the effective state, which can protect a driver seated in the driver's seat, and a first detection device for detecting the effective state and the ineffective state of the protective mechanism. [Effects of the Invention]

[0007] According to the above-mentioned work machine, it is possible to take appropriate action depending on whether the protective mechanism is enabled or disabled. [Brief explanation of the drawing]

[0008] [Figure 1A] This is a side view of the work machine. [Figure 1B] This is a plan view of the work machine. [Figure 2] This is a schematic diagram of the hydraulic and control systems of the work machine. [Figure 3A] This is a side view showing the protection mechanism in its active state. [Figure 3B] This is a plan view showing the protection mechanism in its active state. [Figure 3C] This is a perspective view showing the protection mechanism in its active state. [Figure 4A] This is a cross-sectional view of the upper end of the lower pipe and the lower end of the upper pipe in the protective mechanism. [Figure 4B] This is an exploded perspective view of the first support for the lower pipe and the second support for the upper pipe. [Figure 5] This is an enlarged perspective view of the area including the hinge of the protective mechanism in its active state. [Figure 6] This is an enlarged side view of the area including the hinge of the disabled protection mechanism. [Figure 7] This is a rear view of the connection point between the lower and upper pipes on the left side of the protective mechanism. [Figure 8A] This figure shows an example of how the control device switches on when the protection mechanism is active. [Figure 8B]This is a diagram showing an example in which the control device turns off the switch when the protection mechanism is in a disabled state. [Figure 9] This is a front view of a driver's seat having a seatbelt device, an operation device, and the like. [Figure 10] This is a diagram showing an example of determination conditions for permitting or prohibiting starting of the prime mover based on the states of the protection mechanism and the safety equipment. [Figure 11A] This is a diagram showing an example of the first notification by the notification device. [Figure 11B] This is a diagram showing an example of the second notification by the notification device. [Figure 12] This is a flowchart showing an example of control at the time of starting the prime mover. [Figure 13] This is a diagram showing an example of determination conditions for continuing or stopping the operation of the prime mover based on the states of the protection mechanism and the safety equipment. [Figure 14] This is a flowchart showing an example of control during operation of the prime mover. [Mode for Carrying Out the Invention]

[0009] Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, the overall configuration of the work machine 1 will be described. FIG. 1A is a side view of the work machine 1. FIG. 1B is a plan view of the work machine 1.

[0010] As shown in FIG. 1A and FIG. 1B, the work machine 1 of the embodiment is a rotary work machine (a so-called backhoe). The work machine 1 includes a machine body 2 (rotary body 2A), a traveling device 10 that causes the machine body 2 to travel, and a work device 20 provided on the machine body 2. On the machine body 2, there are provided a driver's seat 4 on which a driver sits, and a protection mechanism 6 that protects the worker (driver) seated on the driver's seat 4.

[0011] The protection mechanism 6 is, for example, a roll-over protection structure, the so-called ROPS. For example, the protection mechanism 6 is a front ROPS as shown in FIG. 1A. The front ROPS has a configuration in which, in a side view of the machine body 2, the upper end side of a pillar erected at the front position of the machine body 2 is bent rearward and extends above the driver's seat 4. Note that the protection mechanism 6 may be a rear ROPS or the like. For example, the rear ROPS has a configuration in which, in a side view of the machine body 2, the upper end side of a pillar erected at the rear position of the machine body 2 is bent forward and extends above the driver's seat 4. In addition, the protection mechanism 6 may be TOPS (Tip-Over Protective Structures), FOPS (Falling-Object Protective Structures), or the like.

[0012] Around the driver's seat 4, an operation device 5 for operating the work machine 1 is provided. The driver can operate the operation device 5 while seated on the driver's seat 4.

[0013] Note that in the present embodiment, the direction that the driver (operator) seated on the driver's seat 4 faces (the direction of arrow YA1 in FIG. 1A and FIG. 1B) is the front, and the opposite direction (the direction of arrow YA2 in FIG. 1A, FIG. 1B, etc.) is the rear. The left side of the driver (the near side in FIG. 1A, the direction of arrow XB1 in FIG. 1B) is the left, and the right side of the driver (the far side in FIG. 1A, the direction of arrow XB2 in FIG. 1B) is the right. In addition, the horizontal direction orthogonal to the front-rear direction YA3 is the width direction XB3 (see FIG. 1B). The direction from the center portion in the width direction XB3 of the machine body 2 toward the right portion or the left portion is the width direction outer side.

[0014] The traveling device 10 is a device that causes the machine body 2 to travel, and includes a traveling frame 11 and a traveling mechanism 12 . The traveling frame 11 (track frame) is a structural body to which the traveling mechanism 12 is attached around the periphery and which supports the machine body 2 at the upper portion.

[0015] The running mechanism 12 is, for example, a crawler-type running mechanism. The running mechanism 12 is provided on the left and right sides of the running frame 11, respectively. The running mechanism 12 includes an idler 13, a drive wheel 14, a plurality of road wheels 15, an endless crawler belt 16, and a running motor (left running motor ML, right running motor MR).

[0016] The idler 13 is located at the front of the running frame 11. The drive wheel 14 is located at the rear of the running frame 11. Multiple road wheels 15 are provided between the idler 13 and the drive wheel 14. The crawler belt 16 is wrapped around the idler 13, the drive wheel 14, and the road wheels 15.

[0017] The left-hand drive motor ML is included in the drive mechanism 12 located on the left side of the drive frame 11. The right-hand drive motor MR is included in the drive mechanism 12 located on the right side of the drive frame 11. Both the left-hand drive motor ML and the right-hand drive motor MR are hydraulic motors. In each drive mechanism 12, the power from the left-hand drive motor ML and the right-hand drive motor MR drives the drive wheels 14 to rotate, causing the crawler belt 16 to circumferentially move around.

[0018] A dozer device 18 is mounted on the front of the traveling device 10. The dozer device 18 swings up and down by the extension and retraction of the dozer cylinder C3. The dozer cylinder C3 is attached to the traveling frame 11. The dozer cylinder C3 consists of a hydraulic cylinder.

[0019] The machine body 2 is supported on the travel frame 11 via a slewing bearing 3 so as to be able to rotate around the slewing axis Z, which is a vertical axis extending in the vertical direction. The slewing motor MT consists of a hydraulic motor (a hydraulic actuator included in hydraulic equipment). The machine body 2 rotates around the slewing axis Z by the power of the slewing motor MT.

[0020] The working device 20 is mounted on the machine body 2. For example, the working device 20 is supported at the front of the machine body 2. The working device 20 comprises a boom 21, an arm 22, a bucket 23, and hydraulic actuators (boom cylinder C1, bucket cylinder C2, dozer cylinder C3, swing cylinder C4, arm cylinder C9). The base end of the boom 21 is supported by a swing bracket 24 so as to be rotatable around a horizontal axis (an axis extending in the width direction XB3 of the machine body 2). As a result, the boom 21 can swing in the vertical direction. The arm 22 is supported at the tip of the boom 21 so as to be rotatable around a horizontal axis. As a result, the arm 22 can swing in the front-rear direction or in the vertical direction.

[0021] The boom cylinder C1 is a boom drive device that rotates the boom 21 around its horizontal axis. The arm cylinder C9 is an arm drive device that rotates the arm 22 around its horizontal axis. The bucket cylinder C2 is a work tool drive device that rotates the bucket 23 (work tool) around its horizontal axis.

[0022] The work machine 1 can be fitted with other work tools (hydraulic attachments) that can be driven by a hydraulic actuator, instead of the bucket 23. Examples of these other work tools include tilt rotators, hydraulic breakers, hydraulic crushers, angle brooms, earth augers, pallet forks, sweepers, mowers, snow blowers, and grapples.

[0023] The swing bracket 24 swings from side to side by rotating around the vertical axis due to the extension and retraction of the swing cylinder C4 located inside the machine body 2. The boom 21 swings up and down (forward and backward) due to the extension and retraction of the boom cylinder C1. The arm 22 swings due to the extension and retraction of the arm cylinder C9. Therefore, it swings up and down (back and forth). The bucket 23 swings up and down (back and forth) due to the extension and retraction of the bucket cylinder C2. The swing cylinder C4, boom cylinder C1, arm cylinder C9, and bucket cylinder C2 are composed of hydraulic cylinders.

[0024] As shown in Figure 1A, the work machine 1 is equipped with a motor E1 for supplying power to the travel device 10 and the work device 20. The motor E1 is a diesel engine. The motor E1 may also be a gasoline engine, an LPG engine, or an electric motor, or it may be a hybrid type having both an engine and an electric motor.

[0025] Figure 2 is a schematic diagram of the hydraulic system and control system of the work machine 1. As shown in Figure 2, the work machine 1 is equipped with a hydraulic pump P driven by power from the prime mover E1. The traveling device 10 and the work device 20 can be driven based on the hydraulic fluid from the hydraulic pump P.

[0026] Specifically, as shown in Figure 2, the hydraulic system of the work machine 1 has three hydraulic pumps P (first hydraulic pump P1, second hydraulic pump P2, and third hydraulic pump P3) and a plurality of control valves V1 to V10. The first hydraulic pump P1 and the second hydraulic pump P2 are variable displacement hydraulic pumps. The third hydraulic pump P3 is a constant displacement hydraulic pump. The first hydraulic pump P1, the second hydraulic pump P2, and the third hydraulic pump P3 are driven by the power of the prime mover E1 to discharge hydraulic fluid stored in the hydraulic fluid tank. In this embodiment, the hydraulic system of the work machine 1 is equipped with three hydraulic pumps P (first hydraulic pump P1, second hydraulic pump P2, and third hydraulic pump P3), but the number is not limited.

[0027] The multiple control valves V1 to V10 are each valves (solenoid control valves) that control the flow rate of hydraulic fluid supplied to hydraulic actuators (work system hydraulic actuators, travel system hydraulic actuators). The multiple control valves V1 to V10 are solenoid 3-position directional control valves whose spool position is switched by the hydraulic fluid (pilot oil) supplied from the third hydraulic pump P3. That is, the multiple control valves V1 to V10 have solenoid valves, and the pressure of the pilot oil acting on the spool changes depending on the opening degree of the solenoid valve, thereby changing the position of the spool. In this embodiment, solenoid 3-position directional control valves with incorporated solenoid valves are shown, but the solenoid valves may be configured as separate components. Furthermore, the multiple control valves V1 to V10 are not limited to 3-position directional control valves, but may also be 2-position directional control valves, 4-position directional control valves, etc.

[0028] The boom control valve V1 controls the boom cylinder C1. The bucket control valve V2 controls the bucket cylinder C2. The dozer control valve V3 controls the dozer cylinder C3. The swing control valve V4 controls the swing cylinder C4. The right travel control valve V5 controls the travel system hydraulic actuator (right travel motor MR) of the first travel device 10R. The left travel control valve V6 controls the travel system travel hydraulic actuator (left travel motor ML) of the second travel device 10L. The first auxiliary control valve V7 controls the auxiliary actuator. The second auxiliary control valve V8 controls the auxiliary actuator. The arm control valve V9 controls the arm cylinder C9. The slewing control valve V10 controls the slewing motor MT.

[0029] The boom control valve V1, bucket control valve V2, dozer control valve V3, swing control valve V4, and right travel control valve V5 are connected to the first discharge oil passage 41, which is connected to the first hydraulic pump P1. The left travel control valve V6, first auxiliary control valve V7, second auxiliary control valve V8, arm control valve V9, and swing control valve V10 are connected to the second discharge oil passage 42, which is connected to the second hydraulic pump P2.

[0030] Hereafter, for the sake of explanation, the group of control valves V1 to V5 will be referred to as the first block BL1, and the group of control valves V6 to V10 will be referred to as the second block BL2.

[0031] A communication valve V11 is provided between the first block BL1 and the second block BL2. The communication valve V11 is a switching valve that switches between a first position and a second position, and connects the first discharge oil passage 41 and the second discharge oil passage 42, respectively. When the communication valve V11 is in the first position, the first discharge oil passage 41 and the second discharge oil passage 42 are connected via the communication valve V11, and when the communication valve V11 is in the second position, the communication between the first discharge oil passage 41 and the second discharge oil passage 42 is blocked by the communication valve V11. Note that the communication valve V11 is not limited to a two-position switching valve, but may also be a three-position switching valve, a four-position switching valve, etc. Note that the hydraulic system of the work machine 1 may be configured without a communication valve V11.

[0032] The work machine 1 is equipped with a slewing device 25 (see Figure 2). The slewing device 25 is a device that includes a slewing bearing 3, a slewing motor MT, and hydraulic pumps P (first hydraulic pump P1, second hydraulic pump P2).

[0033] Next, the configuration of the control system for the work implement 1 will be explained using Figure 2. As shown in Figure 2, the control system for the work implement 1 includes a control device 51 that controls the operation of the work implement 1. The control device 51 consists of a CPU (processor), electronic and electrical circuits, a program, etc.

[0034] The control device 51 includes a hydraulic control unit 53 that controls the hydraulic system. The hydraulic control unit 53 is a work control device that controls the hydraulic systems of the work device 20 and the travel device 10. The hydraulic control unit 53 consists of a CPU (processor), electronic and electrical circuits, a program, etc., provided in the control device 51. The hydraulic control unit 53 controls the hydraulic equipment provided in the work machine 1, such as a plurality of control valves V1 to V10, a communication valve V11, and hydraulic pumps P (first hydraulic pump P1, second hydraulic pump P2). Note that the hydraulic control unit 53 can be anything that controls hydraulic equipment, and the controlled objects are not limited to this embodiment.

[0035] The control device 51 is connected to the operating device 5. The operating device 5 includes work operating members (work operating member 19L, work operating member 19R, work operating member 19D) and travel operating members (travel operating member 20L, travel operating member 20R).

[0036] The operating member 19L is positioned so that the driver (operator) can operate it with their left hand, the operating member 19R is positioned so that the driver can operate it with their right hand, and the operating member 19D is positioned separately from the operating member 19R on the right side of the driver's seat 4 so that the driver can operate it with their right hand. The operating members 19L and 19R are levers having a potentiometer (detection device) for detecting the amount of oscillation (operation amount), and are levers that can swing forward, backward, right, and left. The operating member 19D is a lever having a potentiometer (detection device) for detecting the amount of oscillation (operation amount), and is a lever that can swing forward and backward.

[0037] For example, the work operation member 19L functions as an arm operation member when swung in the front-to-back direction and as a slewing operation member when swung in the left-to-right direction. For example, the work operation member 19R functions as a boom operation member when swung in the front-to-back direction and as a bucket operation member when swung in the left-to-right direction.

[0038] When the operator operates the work operation member 19L, the amount and direction of operation of the work operation member 19L are detected by a potentiometer, and the detected amount and direction of operation are input to the control device 51. The hydraulic control unit 53 energizes the solenoid of the swivel solenoid valve of the swivel control valve V10 and controls the opening degree of the swivel solenoid valve, or energizes the solenoid of the arm solenoid valve of the arm control valve V9 and controls the opening degree of the arm solenoid valve, according to the amount and direction of operation of the work operation member 19L. As a result, pilot pressure acts on the pressure receiving part of the swivel control valve V10, the position of the swivel control valve V10 is switched, and the rotation direction of the swivel motor MT is switched according to the position. Either it can be replaced, or pilot pressure acts on the pressure-receiving part of the arm control valve V9, switching the position of the arm control valve V9, and the arm cylinder C9 extends or retracts according to the position.

[0039] When the operator operates the work operation member 19R, the amount and direction of operation of the work operation member 19R are detected by a potentiometer, and the detected amount and direction of operation are input to the control device 51. The hydraulic control unit 53 energizes the solenoid of the boom solenoid valve of the boom control valve V1 to control the opening degree of the boom solenoid valve, or energizes the solenoid of the bucket solenoid valve of the bucket control valve V2 to control the opening degree of the bucket solenoid valve, according to the amount and direction of operation of the work operation member 19R. As a result, pilot pressure acts on the pressure receiving part of the boom control valve V1, the position of the boom control valve V1 is switched, and the boom cylinder C1 extends or retracts according to the position, or pilot pressure acts on the pressure receiving part of the bucket control valve V2, the position of the bucket control valve V2 is switched, and the bucket cylinder C2 extends or retracts according to the position.

[0040] When the operator operates the work operation member 19D, the amount and direction of operation of the work operation member 19D are detected by a potentiometer, and the detected amount and direction of operation are input to the control device 51. The hydraulic control unit 53 energizes the solenoid of the dozer solenoid valve of the dozer control valve V3 according to the amount and direction of operation of the work operation member 19D, and controls the opening degree of the dozer solenoid valve. As a result, pilot pressure acts on the pressure receiving part of the dozer control valve V3, the position of the dozer control valve V3 is switched, and the dozer cylinder C3 extends and retracts according to the position.

[0041] As described above, the machine body 2, boom 21, arm 22, bucket 23 (swinging only), and dozer device 18 can be operated by operating the work operation members (work operation member 19L, work operation member 19R, work operation member 19D).

[0042] The control device 51 is connected to a driving operation member (driving operation member 20L, driving operation member 20R). The driving operation member 20L and the driving operation member 20R are located in front of the driver's seat 4. The driving operation member 20L and the driving operation member 20R are levers having a potentiometer (detection device) for detecting the amount of swing (operation amount), and are levers that can swing forward and backward. Note that the driving operation member 20L and the driving operation member 20R are not limited to levers, but may be pedals, for example.

[0043] When the driver operates the travel control member 20L and the travel control member 20R, the amount and direction of operation of the travel control member 20L and the travel control member 20R are detected by the potentiometer, and the detected amount and direction of operation are input to the control device 51. The hydraulic control unit 53 energizes the solenoid of the left travel solenoid valve of the left travel control valve V6 according to the amount and direction of operation of the travel control member 20L, and energizes the solenoid of the right travel solenoid valve of the right travel control valve V5 according to the amount and direction of operation of the travel control member 20R. As a result, pilot pressure is applied to the pressure receiving parts of the right travel control valve V5 and the left travel control valve V6, causing the right travel control valve V5 and the left travel control valve V6 to switch, and the rotation direction of the right travel motor MR and the left travel motor ML is determined.

[0044] As described above, when operating the work operation members (work operation member 19L, work operation member 19R, work operation member 19D) and the travel operation members (travel operation member 20L, travel operation member 20R), the control device 51 outputs control signals for excitation and demagnetization of the solenoids, thereby enabling control of the machine body 2, boom 21, arm 22, bucket 23, dozer device 18, first travel device 10R, and second travel device 10L.

[0045] As shown in Figure 2, the work machine 1 is equipped with a notification device 70. The notification device 70 includes, for example, a display device 71. The display device 71 has a display unit 72 and displays information and operations related to the work machine 1. It can display information related to notifications to the driver. The display unit 72 is composed of a panel such as an LCD. The display unit 72 may also be equipped with a touch panel and can accept touch input operations from the driver or others. The notification device 70 may have an audio output device such as a speaker. The display device 71 may be a meter panel, an instrument panel, or the like.

[0046] The work machine 1 is equipped with a battery 75 that supplies power to electrical equipment such as a control device 51 and an alarm device 70.

[0047] The control device 51 is connected to a first setting member 31 and a second setting member 32. The first setting member 31 is a member that accepts selections regarding the rotational speed setting of the prime mover E1 (a member that sets the rotational speed of the prime mover E1). The second setting member 32 is a member that accepts selections regarding the speed setting of the hydraulic actuator (a member that sets the speed of the hydraulic actuator). The control device 51 includes a rotational speed control unit 55, a speed control unit 56, and a storage unit 54.

[0048] The storage unit 54 is a non-volatile memory or the like, and stores various information (programs, data, etc.) related to the control of the control device 51. For example, the storage unit 54 may be an HDD (Hard Disk Drive), an SSD (Solid State Drive), etc.

[0049] The rotational speed control unit 55 is composed of a CPU (processor), electronic and electrical circuits, a program, etc., provided in the control device 51. The rotational speed control unit 55 sets the rotational speed of the prime mover E1 based on the operation signal of the first setting member 31. That is, the rotational speed control unit 55 increases or decreases the rotational speed of the prime mover E1 based on the operation of the first setting member 31.

[0050] The speed control unit 56 is composed of a CPU (processor), electronic and electrical circuits, and a program provided in the control device 51, and sets the work speed based on the operation signals input from the first setting member 31 and the second setting member 32. Based on the work speed read from the memory unit 54, the speed control unit 56 energizes the solenoid valves of the control valves V1 to V10 with control signals corresponding to the operation amounts of the work operation members 19L, 19R, and 19D, thereby controlling the control valves V1 to V10. Specifically, the speed control unit 56 controls the maximum speed of the hydraulic actuators connected to each control valve V1 to V10 by changing the opening degree of the control valves V1 to V10.

[0051] Here, the protection mechanism 6 will be explained in detail using drawings. The protection mechanism 6 is configured to be displaceable between an effective state that can protect the driver seated in the driver's seat 4 (see protection mechanism 6 shown by the solid line in Figure 1A) and an ineffective state other than the effective state (protection mechanism 6 shown by the dashed line in Figure 1A).

[0052] Figure 3A is a side view showing the protection mechanism 6 in its active state. Figure 3B is a top view showing the protection mechanism 6 in its active state. Figure 3C is a perspective view showing the protection mechanism 6 in its active state. In Figures 3A to 3C, the upper pipe 62 is shown with a dashed line to clearly show the second electric wire 622 inside the upper pipe 62. As shown in Figures 3A and 3C, the protection mechanism 6 comprises a lower pipe 61 erected on the machine body 2 (rotating body 2A), an upper pipe 62 located above the lower pipe 61, and a hinge portion 63 (rotating mechanism) that rotatably supports the upper pipe 62 relative to the lower pipe 61.

[0053] As shown in Figure 3C, the lower pipe 61 has a left lower pipe 61L and a right lower pipe 61R, which are erected at the front of the machine body 2, spaced apart in the width direction XB3 of the machine body 2. The left lower pipe 61L and the right lower pipe 61R are supported by a support pipe 61M that extends in the width direction XB3 of the machine body 2.

[0054] Figure 4A shows the upper end portion of the lower pipe 61 and the lower end portion of the upper pipe 62 in the protective mechanism 6. This is a cross-sectional view. Figure 4B is an exploded perspective view of the first support 613 of the lower pipe 61 and the second support 624 of the upper pipe 62. Figure 5 is an enlarged perspective view of the area including the hinge portion 63 of the protective mechanism 6 in the active state. Figure 6 is an enlarged side view of the area including the hinge portion 63 of the protective mechanism 6 in the deactivated state.

[0055] As shown in Figures 4A and 4B, the lower pipe 61 comprises a first electric wire 611 inserted inside the pipe and a first support member 613 that supports a first contact 612 connected to the tip of the first electric wire 611 at the upper end of the lower pipe 61. The first electric wire 611 is, for example, a single-core wiring wire (electric wire: one conductor covered with an insulator), but is not limited to this. The first electric wire 611 may also be a multi-core wiring wire (two or more electric wires covered with a sheath (jacket)). In other words, the left lower pipe 61L and the right lower pipe 61R that constitute the lower pipe 61 each comprise the first electric wire 611 and the first support member 613. The other end of the first electric wire 611 of the left lower pipe 61L and the other end of the first electric wire 611 of the right lower pipe 61R are connected to the battery 75 of the work machine 1 (see Figure 2).

[0056] As shown in Figures 3A and 3C, the upper pipe 62 is equipped with a lighting fixture 621 such as a lamp or a rotating light. As shown in Figures 4A and 4B, the upper pipe 62 is equipped with a second electric wire 622, one end of which is connected to the lighting fixture 621 and inserted into the pipe, and a second support member 624 that supports a second contact 623, which is connected to the other end of the second electric wire 622, at the lower end position of the upper pipe 62. The second electric wire 622 is, for example, a single-core wiring wire of the same type as the first electric wire 611. If the first electric wire 611 is a multi-core wiring wire, then the second electric wire 622 is a multi-core wiring wire of the same type as the first electric wire 611.

[0057] As shown in Figures 3A and 3C, the upper pipe 62 is composed of a left upper pipe section 62L located above the left lower pipe 61L, a right upper pipe section 62R located above the right lower pipe 61R, a left extension pipe section 62L1 which extends above the driver's seat 4 by bending the upper end of the left upper pipe section 62L backward, a right extension pipe section 62R1 which extends above the driver's seat 4 by bending the upper end of the right upper pipe section 62R backward, and a connecting pipe section 62M which connects the extension end of the left extension pipe section 62L1 and the extension end of the right extension pipe section 62R1.

[0058] As shown in Figure 3C, the lighting fixture 621 is attached to the connecting pipe section 62M by a bracket 621a. The connecting pipe section 62M has a through hole formed at or near the mounting location of the lighting fixture 621. The second electric wire 622 consists of a left second electric wire 622L, which is located on the left side of the upper pipe 62, and a right second electric wire 622R, which is located on the right side of the upper pipe 62. The left second electric wire 622R exits from the left upper pipe section 62L, through the left extension pipe section 62L1 and the connecting pipe section 62M, and exits through a through hole in the connecting pipe section 62M, connecting to the first terminal (e.g., the positive terminal) of the lighting fixture 621. On the other hand, the right second electric wire 622R exits from the right upper pipe section 62R, through the right extension pipe section 62R1 and the connecting pipe section 62M, and exits through a through hole in the connecting pipe section 62M, connecting to the second terminal (e.g., the negative terminal) of the lighting fixture 621.

[0059] As shown in Figure 3C, the electrical wiring of the lighting fixture 621 consists of a first wire 611 and first contact 612 inside the left lower pipe 61L (see Figures 4A and 4B), a second wire 622L and second contact 623 on the left side, a second wire 622R and second contact 623 on the right side, and a first wire 611 and first contact 612 inside the right lower pipe 61R (see Figures 4A and 4B).

[0060] Here, we will explain the structure of the first support member 613 of the lower pipe 61 and the second support member 624 of the upper pipe 62 in order.

[0061] As shown in Figures 4A and 4B, the first support member 613 of the lower pipe 61 can be fitted into the lower pipe 61. It is a functional cylindrical insulator (rubber, resin, etc.). For example, the first support member 613 has an insertion cylinder portion 613a that is fitted into the lower pipe 61, a disc-shaped flange portion 613b that protrudes radially from the outer circumference of one end of the insertion cylinder portion 613a, and a holding portion 613c that holds the first electric wire 611 inserted into the cylinder from the opening at the other end of the insertion cylinder portion 613a, with the first contact 612 at the tip of the first electric wire 611 protruding slightly beyond the flange portion 613b.

[0062] The insertion cylinder portion 613a has a bellows shape along its longitudinal direction, so it is fixed in the position where it is inserted into the lower pipe 61. The holding portion 613c has a counterbore hole 613c1 formed inward from one end of the insertion cylinder portion 613a, a coil spring 613c2 provided in the counterbore hole 613c1 so that the first electric wire 611 is inserted and the first contact 612 is biased toward one end, and a fixing device 613c3 that fixes the first electric wire 611 at the other end of the insertion cylinder portion 613a so that the first contact 612 protrudes slightly beyond the flange portion 613b. Therefore, when the protective mechanism 6 is deactivated, the first contact 612 protrudes slightly beyond the flange portion 613b, and when the protective mechanism 6 is activated, as shown in Figure 4A, the coil spring 613c2 biases the first contact 612 toward the second contact 623, so that the first contact 612 makes reliable contact with the second contact 623.

[0063] As shown in Figures 4A and 4B, the second support member 624 of the upper pipe 62 has the same configuration as the first support member 613 of the lower pipe 61. The second support member 624 is a cylindrical insulator (rubber, resin, etc.) that can be fitted into the upper pipe 62. For example, the second support member 624 has a fitted cylindrical portion 624a that is fitted into the upper pipe 62, a disc-shaped flange portion 624b that protrudes radially from the outer circumference of one end of the fitted cylindrical portion 624a, and a holding portion 624c that holds the second electric wire 622 inserted into the cylinder from the opening at the other end of the fitted cylindrical portion 624a, with the second contact 623 at the tip of the second electric wire 622 protruding slightly beyond the flange portion 624b.

[0064] The insertion cylinder portion 624a has a bellows shape along its longitudinal direction, so it is fixed in the position where it is inserted into the upper pipe 62. The holding portion 624c has a counterbore hole 624c1 formed from one end of the insertion cylinder portion 624a toward the inside of the cylinder, a coil spring 624c2 provided in the counterbore hole 624c1 so that the second electric wire 622 is inserted and biases the first contact 612 toward one end, and a fixing device 624c3 that fixes the second electric wire 622 at the other end of the insertion cylinder portion 624a with the second electric wire 622 protruding slightly beyond the flange portion 624b. Therefore, when the protective mechanism 6 is deactivated, the second contact 623 protrudes slightly beyond the flange portion 624b, and when the protective mechanism 6 is activated, the coil spring 624c2 biases the second contact 623 toward the first contact 612, so that the second contact 623 makes reliable contact with the first contact 612.

[0065] The hinge portion 63 rotatably supports the upper pipe 62 so that it can be displaced between an upright position, where the lower end of the upper pipe 62 is connected to the upper part of the lower pipe 61, as shown by the solid line in Figure 1A, and a tilted position, where the lower end of the upper pipe 62 is not connected to the upper part of the lower pipe 61, as shown by the dashed line in Figure 1A. The hinge portion 63 is provided on the left and right sides of the protective mechanism 6.

[0066] As shown in Figure 3C, the hinge portion 63 includes a lower support piece 631 that protrudes forward from the front upper end of the lower pipe 61 and extends in the longitudinal direction of the lower pipe 61, an upper support piece 632 that protrudes forward from the front lower end of the upper pipe 62 and extends along the longitudinal direction of the upper pipe 62, and further extends below the lower end of the upper pipe 62, a pivot shaft portion 633 that rotatably supports the upper support piece 632 with respect to the lower support piece 631, and a pin portion 634 that fixes the upper support piece 632 to the lower support piece 631.

[0067] As shown in Figures 4A and 5, the pivot shaft portion 633 has a first pivot shaft hole 633a that penetrates the width direction XB3 of the machine body 2 on the lower side of the lower support piece 631, and a first pivot shaft hole 633a that penetrates the width direction XB3 of the machine body 2 on the lower side of the upper support piece 632 It has a second pivot shaft hole 633b that penetrates in the width direction XB3, and a pivot shaft 633c that is inserted into the first pivot shaft hole 633a and the second pivot shaft hole 633b and serves as the pivot axis of the upper support piece 632.

[0068] As shown in Figures 4A and 5, the pin portion 634 has a first pin hole 634a that penetrates the width direction XB3 of the machine body 2 on the upper side of the lower support piece 631, a second pin hole 634b that penetrates the width direction XB3 of the machine body 2 on the upper side of the upper support piece 632, and a fixing pin 634c that restricts the rotation of the upper pipe 62 by being inserted into the first pin hole 634a and the second pin hole 634b.

[0069] As shown in Figure 4A, when the upper pipe 62 is positioned above the lower pipe 61 (i.e., the protective mechanism 6 is in effect), the lower support piece 631 of the lower pipe 61 and the portion of the upper support piece 632 of the upper pipe 62 that protrudes beyond the lower end of the upper pipe 62 overlap when viewed from the width direction XB3 of the machine body 2. In this state, the first pin hole 634a and the second pin hole 634b coincide, so the fixing pin 634c can be inserted into the first pin hole 634a and the second pin hole 634b. The fixing pin 634c is attached to the lower support piece 631 via a fall prevention wire to prevent it from falling and being lost during insertion or removal.

[0070] The effective state of the protection mechanism 6 is when the upper pipe 62 is in an upright position, as shown by the solid line in Figure 1A. On the other hand, the inactive state of the protection mechanism 6 is any state other than the effective state, and includes the state in which the upper pipe 62 is in a tilted position, as shown by the dashed line in Figure 1A.

[0071] In the upright position of the upper pipe 62, shown by the solid line in Figure 1A (the effective state of the protection mechanism 6), the first contact 612 and the second contact 623 are in contact, as shown in Figure 4A. More specifically, the first contact 612 of the left lower pipe 61L is in contact with the second contact 623 of the left upper pipe section 62L, and the first contact 612 of the right lower pipe 61R is in contact with the second contact 623 of the right upper pipe section 62R.

[0072] On the other hand, in the tilted position of the upper pipe 62 shown by the dashed line in Figure 1A (the disabled state of the protection mechanism 6), the first contact 612 and the second contact 623 are not in contact, as shown in Figure 6. More specifically, the first contact 612 of the left lower pipe 61L and the second contact 623 of the left upper pipe section 62L are not in contact, and the first contact 612 of the right lower pipe 61R and the second contact 623 of the right upper pipe section 62R are not in contact.

[0073] As shown in Figures 2 and 3C, the work machine 1 is equipped with a first detection device 80 that detects the active state of the protective mechanism 6, shown by a solid line in Figure 1A, and the deactivated state, shown by a dashed line in Figure 1A.

[0074] As shown in Figure 5, the first detection device 80 includes a sensor unit 81 provided on the lower pipe 61 and an object to be detected 82 provided on the upper pipe 62 and detected by the sensor unit 81. The first detection device 80 is connected to the control device 51. The sensor unit 81 is, for example, a magnetic proximity sensor such as a reed switch. On the other hand, the object to be detected 82 is, for example, a magnet. When the sensor unit 81 detects the object to be detected 82 (magnet) (i.e., the state shown in Figure 5), the first detection device 80 outputs an ON signal to the control device 51. On the other hand, when the sensor unit 81 does not detect the object to be detected 82 (magnet) (i.e., the state shown in Figure 6), the first detection device 80 outputs an OFF signal to the control device 51.

[0075] As shown in Figure 3A, the cable 84 of the sensor unit 81 is provided on the outside of the lower pipe 61 along the longitudinal direction of the lower pipe 61. The cable 84 of the sensor unit 81 is held on the outside of the lower pipe 61 by a fastener 85. Alternatively, the cable 84 of the sensor unit 81 may be provided inside the lower pipe 61.

[0076] As shown in Figure 5, the sensor unit 81 is fixed to the lower pipe 61 by the first bracket 614. It is attached. The part to be attached 82 is attached to a second bracket 625 which is fixed to the upper pipe 62.

[0077] As shown in Figures 3C and 5, in the upright position of the upper pipe 62 (the effective state of the protection mechanism 6), the first bracket 614 is fixed to the lower pipe 61 and the second bracket 625 is fixed to the upper pipe 62 so that the sensor unit 81 and the object to be detected 82 are facing each other. Therefore, the sensor unit 81 detects the object to be detected 82 in the upright position of the upper pipe 62 (the effective state of the protection mechanism 6).

[0078] On the other hand, as shown in Figure 6, when the upper pipe 62 is tilted (the protective mechanism 6 is disabled), the sensor unit 81 and the object being detected 82 do not face each other, so the sensor unit 81 does not detect the object being detected 82.

[0079] Note that the sensor unit 81 is not limited to a magnetic proximity sensor. The object to be detected 82 is not limited to a magnet. The sensor unit 81 may be a contact-type electrical switch such as a limit switch, or a non-contact sensor such as a photoelectric sensor. If the sensor unit 81 is a contact-type electrical switch such as a limit switch, the object to be detected 82 may be a metal part that does not deform upon contact, a non-metal part (resin part), etc. If the sensor unit 81 is a non-contact sensor such as a photoelectric sensor, the object to be detected 82 may be a component suitable for non-contact detection, such as a material that can reflect or shield light.

[0080] Furthermore, the first detection device 80 may detect the upright position of the upper pipe 62 (effective state of the protection mechanism 6) and the tilted position of the upper pipe 62 (inactive state of the protection mechanism 6) by detecting the continuity, resistance, etc., between the first wire 611 and the second wire 622. For example, the first detection device 80 detects that the upper pipe 62 is in the upright position if there is continuity between the first wire 611 and the second wire 622 or if the resistance value is less than a threshold, and detects that the upper pipe 62 is in the tilted position if there is no continuity or if the resistance value is above a threshold.

[0081] As shown in Figure 5, the sensor unit 81 is located on the lower pipe 61 and the object to be targeted 82 is located on the upper pipe 62. However, the opposite arrangement is also possible: the sensor unit 81 may be located on the upper pipe 62 and the object to be targeted 82 on the lower pipe 61.

[0082] Here, we will specifically describe the fixing configuration of the first bracket 614 to the lower pipe 61. Figure 7 is a rear view of the connection point between the lower pipe 61 and the upper pipe 62 on the left side of the protective mechanism 6.

[0083] As shown in Figures 5 and 7, a horizontally elongated sheet metal 615 to which the first bracket 614 is fixed is fixed (e.g., welded) to one end of the upper rear of the lower pipe 61. Two female threads 615a are formed vertically on the other end of the horizontally elongated sheet metal 615. The first bracket 614 is, for example, a sheet metal plate and has a horizontally elongated portion 614a that can abut against the horizontally elongated sheet metal 615. A mounting portion 614b to which the sensor portion 81 is attached is provided on one end of the horizontally elongated portion 614a, and two vertically elongated holes 614c are formed vertically spaced apart on the other end of the horizontally elongated portion 614a. For example, fasteners such as bolts 614d are inserted into each of the elongated holes 614c of the first bracket 614 and fastened to the female threads 615a of the elongated sheet metal 615, thereby fixing the first bracket 614 to the elongated sheet metal 615 of the lower pipe 61.

[0084] Next, the fixing configuration of the second bracket 625 to the upper pipe 62 will be described in detail. As shown in Figures 5 and 7, a protruding sheet metal 626 to which the second bracket 625 is fixed is fixed (e.g., welded) to the lower rear end of the upper pipe 62. The protruding sheet metal 626 has female threads 626 Two 'a's are formed side by side in the horizontal direction. The second bracket 625 is, for example, an L-shaped sheet metal and has an upper surface portion 625a that can abut against the protruding sheet metal 626, and an extension portion 625b that bends downward from the other end of the upper surface portion 625a in the horizontal direction. The object to be attached 82 (for example, a magnet) is attached to the extension portion 625b. Two elongated holes 625c are formed in the upper surface portion 625a, spaced apart in the horizontal direction. For example, fasteners such as bolts 625d are inserted into the two elongated holes 625c of the second bracket 625 and fastened to each female thread 626a of the protruding sheet metal 626, thereby fixing the second bracket 625 to the protruding sheet metal 626 of the upper pipe 622.

[0085] As shown in Figures 5 and 7, the first detection device 80 includes a position adjustment unit 83 that can adjust the positional relationship between the sensor unit 81 and the object to be detected 82 (magnet) when the upper pipe 62 is in an upright position. The position adjustment unit 83 can adjust the positional relationship between the sensor unit 81 and the object to be detected 82, for example, in the vertical direction (height direction ZC3 of the machine body 2) and the left-right direction (width direction XB3 of the machine body 2). With the position adjustment unit 83, the positional relationship between the sensor unit 81 and the object to be detected 82 can be adjusted when the upper pipe 62 is in an upright position, and detection by the first detection device 80 can be suitably maintained.

[0086] As shown in Figures 5 and 7, the vertical adjustment configuration of the position adjustment unit 83 consists of a first bracket 614 with two vertically elongated holes 614c, a horizontally elongated sheet metal 615 with two female threads 615a arranged vertically at a distance from each other, and a bolt 614d for fixing the first bracket 614 to the horizontally elongated sheet metal 615. Specifically, the two vertically elongated holes 614c of the first bracket 614 allow the position of the first bracket 614 to be adjusted vertically (in the height direction ZC3 of the machine body 2) relative to the horizontally elongated sheet metal 615, and the first bracket 614 can be fixed to the horizontally elongated sheet metal 615 with the bolt 614d.

[0087] On the other hand, the left-right adjustment configuration of the position adjustment unit 83, as shown in Figures 5 and 7, consists of a second bracket 625 with two elongated holes 625c formed therein in the horizontal direction, a protruding sheet metal 626 with two female threads 626a formed therein at a horizontal distance apart, and a bolt 625d for fixing the second bracket 625 to the protruding sheet metal 626. Specifically, the elongated holes 625c in the horizontal direction of the first bracket 614 allow the position of the second bracket 625 to be adjusted in the left-right direction (width direction XB3 of the machine body 2) relative to the protruding sheet metal 626, and the second bracket 625 can be fixed to the protruding sheet metal 626 with the bolt 625d.

[0088] Furthermore, since the object being targeted 82 (magnet) is long in the front-to-back direction (the front-to-back direction of the aircraft body 2), there is no need to adjust the positional relationship between the sensor unit 81 and the object being targeted 82 in the front-to-back direction (the front-to-back direction of the aircraft body 2). For this reason, the position adjustment unit 83 does not have a configuration for adjusting the positional relationship between the sensor unit 81 and the object being targeted 82 in the front-to-back direction.

[0089] As shown in Figures 8A and 8B, the work machine 1 may also be equipped with a switch 76 for supplying and stopping power to the first electric wire 611. Figure 8A shows an example in which the control device 51 turns on the switch 76 when the protection mechanism 6 is active. Figure 8B shows an example in which the control device 51 turns off the switch 76 when the protection mechanism 6 is deactivated. The switch 76 is located near the battery 75 on the first electric wire 611. The switch 76 can be, for example, a relay, an electromagnetic contactor, or an electrical switch. The switch 76 may be located at the output terminal of the battery 75, or it may be an on / off function for the battery 75's output.

[0090] In the upright position of the upper pipe 62 shown in Figure 3C (the effective state of the protection mechanism 6), the left upper pipe section 62L is located above the left lower pipe 61L, and the right upper pipe section 62R is located above the right lower pipe 61R. Therefore, as shown in Figure 4A, the first contact 612 of the lower pipe 61 and the second contact 62 of the upper pipe 62 Contact 623 is in contact with the first contact 612 and the second contact 623 are not exposed. As shown in Figure 8A, the control device 51 may turn on the switch 76 and supply power to the lighting fixture 621 based on the detection result of the first detection device 80 (a signal indicating the effective state of the protection mechanism 6: ON signal).

[0091] On the other hand, as shown in Figure 6, when the upper pipe 62 is tilted (protection mechanism 6 is disabled), the first contact 612 of the left lower pipe 61L and the first contact 612 of the right lower pipe 61R are exposed. For this reason, as shown in Figure 8B, the control device 51 may turn off the switch 76 based on the detection result of the first detection device 80 (a signal indicating the disabled state of protection mechanism 6: OFF signal). Alternatively, the control device 51 may turn off the switch 76 if there is no continuity between the first wire 611 and the second wire 622 or if the resistance value is above a threshold. In this case, since the switch 76 is off, no power is supplied to the first contact 612 of the left lower pipe 61L and the first contact 612 of the right lower pipe 61R, and there is no risk of electric shock even if the first contact 612 is touched.

[0092] Incidentally, as shown in Figure 2, the work machine 1 is equipped with safety equipment 154A, such as a seat belt 154, that keeps the driver in the driver's seat 4, and a second detection device 90 that detects whether the safety equipment 154A (hereinafter referred to as "seat belt 154" as appropriate) is in use or not in use.

[0093] Figure 9 is a front view of the driver's seat 4, operating device 5, etc., which have a seat belt device 150. As shown in Figure 9, the work machine 1 is equipped with a seat belt device 150. The driver's seat 4 is provided with a seat belt device 150. The seat belt device 150 has a seat belt 154 to be worn by an operator seated in the driver's seat 4, a storage section 152 for housing the seat belt 154, and a buckle 153 to which the end portion 155 of the seat belt 154 can be attached and detached.

[0094] As shown in Figure 9, the seat belt 154 is retractably housed in the housing 152. The seat belt 154 has its tip 155 protruding from the housing 152, and its base end is housed inside the housing 152.

[0095] The tip 155 of the seat belt 154, which has been pulled out from the storage compartment 152, is inserted into and engaged with the buckle 153. The buckle 153 is also equipped with a release button 156. When the driver operates the release button 156 on the buckle 153, the engagement of the tip 155 of the seat belt 154 is released, and the tip 155 of the seat belt 154 is detached from the buckle 153.

[0096] As shown in Figures 2 and 9, the buckle 153 is equipped with a second detection device 90. The second detection device 90 detects whether the tip 155 of the seat belt 154 is engaged with the buckle 153 (seat belt 154 in use, worn) or not engaged (seat belt 154 not in use, not worn). The second detection device 90 is connected to the control device 51.

[0097] The second detection device 90 is, for example, a reed switch. A magnet is also provided at the tip 155 of the seat belt 154. When the tip 155 of the seat belt 154 is engaged with the buckle 153, the magnetic force of the magnet at the tip 155 acts on the reed switch, causing the two contacts inside the reed switch to make contact. In this case, the second detection device 90 outputs a signal (for example, an ON signal) indicating the contact state to the control device 51.

[0098] On the other hand, when the tip 155 of the seat belt 154 is not engaged with the buckle 153, the magnetic force of the magnet on the tip 155 does not act on the reed switch, so the two contacts inside the reed switch are separated. In this case, the second detection device 90 outputs a signal (for example, an OFF signal) indicating the separated state to the control device 51.

[0099] The second detection device 90 may be a magnetic proximity switch other than a reed switch, and various contact-type or non-contact-type switches, sensors, etc., may be used as long as they can detect the fastening and detachment of the seat belt 154.

[0100] Now, the control device 51 shown in Figure 2 restricts the operation of the work implement 1 based on the detection results of the first detection device 80. Furthermore, the control device 51 restricts the operation of the work implement 1 based on the detection results of both the first detection device 80 and the second detection device 90.

[0101] The control device 51 prohibits the operation of the work implement 1 when the protective mechanism 6 is active and the seat belt 154 is not in use. Furthermore, the control device 51 prohibits the operation of the work implement 1 when the protective mechanism 6 is deactivated and the seat belt 154 is in use. Specifically, the control device 51 prohibits the operation of the work implement 1 by prohibiting the driving of the prime mover E1.

[0102] The control device 51 may, instead of prohibiting the operation of the prime mover E1, stop the supply of hydraulic fluid from the hydraulic pumps P (for example, the first hydraulic pump P1 and the second hydraulic pump P2) to the travel device 10 and the work device 20. For example, the control device 51 stops the supply of hydraulic fluid to the travel device 10 and the work device 20 by returning the hydraulic fluid discharged by the hydraulic pumps P to the hydraulic fluid tank without supplying it to the hydraulic equipment (hydraulic unloading). Alternatively, if the operating device 5 is an operating device with an operating valve, the control device 51 may, for example, shut off the supply of pilot oil from the third hydraulic pump P3 to the operating valve of the operating device using a hydraulic lock switching valve, thereby creating a hydraulic lock state in which the travel device 10 and the work device 20 do not operate.

[0103] Furthermore, the control device 51 does not prohibit the operation of the work machine 1 when the protective mechanism 6 is disabled and the seat belt 154 is not in use. Specifically, the control device 51 does not prohibit the driving of the prime mover E1.

[0104] Figure 10 shows an example of the conditions for determining whether or not the prime mover E1 can be started, based on the state of the protective mechanism 6 and the safety device 154A (seat belt 154). The memory unit 54 stores the conditions shown in Figure 10 in advance. The control device 51 determines whether or not the prime mover E1 can be started at the time of starting the prime mover E1, based on the conditions shown in Figure 10 that are stored in advance in the memory unit 54.

[0105] As shown in Figure 10, when the control device 51 receives a command to start the engine E1, if the protective mechanism 6 is active and the seat belt 154 is in use, or if the protective mechanism 6 is inactive and the seat belt 154 is not in use, the control device 51 determines that the engine E1 can be started and starts the engine E1. On the other hand, if the protective mechanism 6 is active and the seat belt 154 is not in use, or if the protective mechanism 6 is inactive and the seat belt 154 is in use, the control device 51 determines that the engine E1 cannot be started and does not start the engine E1.

[0106] As shown in Figure 10, the notification device 70 provides a first notification (for example, by lighting the indicator 73) to encourage the use of the seat belt 154 when the protective mechanism 6 is active and the seat belt 154 is not in use. Figure 11A shows an example of the first notification by the notification device 70. As shown in Figure 11A, the display device 71 lights up, for example, the indicator 73 (warning light) related to the seat belt 154 on the display unit 72 as the first notification. The display device 71 may also display the message M1 "Please fasten your seat belt." along with or instead of lighting the indicator 73. The voice output device of the notification device 70 may also provide an audio notification of "Please fasten your seat belt."

[0107] On the other hand, as shown in Figure 10, the notification device 70 provides a second notification (for example, flashing of indicator 73) to encourage the passenger to unbuckle the seat belt 154 when the protective mechanism 6 is disabled and the seat belt 154 is in use. Figure 11B shows an example of the second notification by the notification device 70. As shown in Figure 11B, the display device 71 flashes the indicator 73 (warning light) on the display unit 72 as the second notification. The display device 71 may also display the message M2, "Please unbuckle your seat belt," along with or instead of flashing the indicator 73. The voice output device of the notification device 70 may also provide an audio notification, "Please unbuckle your seat belt."

[0108] Here, the startup control of the prime mover E1 by the control device 51 will be explained using Figure 12. Figure 12 is a flowchart showing an example of startup control of the prime mover E1.

[0109] As shown in Figure 12, the control device 51 determines whether or not the prime mover E1 has started (S11). For example, if the control device 51 detects that the ignition key is ON, it determines that the prime mover E1 has started (Yes in S11). Note that if the work machine 1 has a start button that instructs the prime mover E1 to start, the start of the prime mover E1 may also be determined when the start button is turned ON. On the other hand, if the control device 51 has not detected that the prime mover E1 has started (No in S11), it terminates this process.

[0110] If the control device 51 determines that the prime mover E1 has started to start (Yes in S11), it determines whether the protection mechanism 6 is in an active state (upper pipe 62 is in an upright position) based on the detection signal from the first detection device 80 (S12). If the detection signal from the first detection device 80 is ON, the control device 51 determines that the protection mechanism 6 is in an active state (Yes in S12).

[0111] If the control device 51 determines that the protection mechanism 6 is active (Yes in S12), it determines whether the seat belt 154 is in use (worn) based on the detection signal from the second detection device 90 (S13). If the detection signal from the second detection device 90 is ON, the control device 51 determines that the seat belt 154 is in use (worn) (Yes in S13), determines that the engine E1 can be started based on the determination conditions shown in Figure 10 (S14), and starts the engine E1. In this case, the control device 51 does not display the indicator 73 on the notification device 70 (display device 71). In other words, the display device 71 turns off the indicator 73.

[0112] On the other hand, in S13, if the detection signal from the second detection device 90 is OFF, the control device 51 determines that the seat belt 154 is not in use (not fastened) (No in S13), and determines that the engine E1 cannot be started based on the determination conditions shown in Figure 10 (S15), and does not start the engine E1. In this case, as shown in Figure 11A, the control device 51 lights up the indicator 73 in the notification device 70 (display device 71). In other words, the display device 71 lights up the indicator 73.

[0113] On the other hand, in S12, if the detection signal from the first detection device 80 is OFF, the control device 51 determines that the protection mechanism 6 is not in an active state (No in S12). In other words, if No in S12, the control device 51 determines that the protection mechanism 6 is in an inactive state (the upper pipe 62 is in a tilted position).

[0114] If the control device 51 determines that the protection mechanism 6 is in an inactive state (No in S12), it determines whether the seat belt 154 is in an unused state (not fastened) based on the detection signal from the second detection device 90 (S16). If the detection signal from the second detection device 90 is OFF, the control device 51 determines that the seat belt 154 is in an unused state (not fastened) (Yes in S16), determines that the engine E1 can be started based on the determination conditions shown in Figure 10 (S14), and starts the engine E1. In this case, the control device 51 does not display the indicator 73 on the notification device 70 (display device 71). In other words, the display device 71 turns off the indicator 73.

[0115] On the other hand, in S16, if the detection signal from the second detection device 90 is ON, the control device 51 determines that the seat belt 154 is in use (worn) (No in S16), and determines that the engine E1 cannot be started based on the determination conditions shown in Figure 10 (S17), and does not start the engine E1. In this case, as shown in Figure 11B, the control device 51 makes the indicator 73 in the notification device 70 (display device 71) blink. In other words, the display device 71 makes the indicator 73 blink.

[0116] Next, the determination conditions during the operation of the prime mover E1 will be explained. Figure 13 is a diagram showing an example of the determination conditions for continuing or stopping the operation of the prime mover E1 based on the state of the protective mechanism 6 and the safety device 154A (seat belt 154). The memory unit 54 stores the conditions shown in Figure 13 in advance. The control device 51 determines whether to continue or stop the operation of the prime mover E1 while it is in operation, based on the conditions shown in Figure 13 that are stored in advance in the memory unit 54.

[0117] As shown in Figure 13, the control device 51 checks for changes in the state of the protective mechanism 6 and the seat belt 154 at predetermined periodic judgment timings (for example, every few hundred milliseconds) while the prime mover E1 is operating.

[0118] As shown in Figure 13, the control device 51 stops the engine E1 while the engine E1 is running if the protective mechanism 6 is active and the seat belt 154 changes from an active state to an inactive state, if the protective mechanism 6 is deactivated and the seat belt 154 changes from an inactive state to an active state, if the seat belt 154 is in an active state and the protective mechanism 6 changes from an active state to an inactive state, or if the seat belt 154 is in an inactive state and the protective mechanism 6 changes from an inactive state to an active state.

[0119] As shown in Figure 13, the notification device 70 provides a first notification (for example, by lighting the indicator 73) to encourage the use of the seat belt 154 when the protective mechanism 6 is active and the seat belt 154 changes from an active state to an inactive state, or when the seat belt 154 is in an inactive state and the protective mechanism 6 changes from an inactive state to an active state. As shown in Figure 11A, the display device 71 illuminates, for example, the indicator 73 (warning light) related to the seat belt 154 on the display unit 72 as the first notification. The display device 71 may also display the message M1 "Please fasten your seat belt." along with or instead of lighting the indicator 73. The voice output device of the notification device 70 may also provide an audio notification of "Please fasten your seat belt."

[0120] On the other hand, as shown in Figure 13, the notification device 70 provides a second notification (for example, flashing of indicator 73) to encourage the unwearing of the seat belt 154 when the protective mechanism 6 is disabled and the seat belt 154 changes from an unused state to an used state, or when the seat belt 154 is in use and the protective mechanism 6 changes from an enabled state to an disabled state. Figure 11B shows an example of the second notification by the notification device 70. As shown in Figure 11B, the display device 71 flashes the indicator 73 (warning light) on the display unit 72 as the second notification. The display device 71 may also display the message M2, "Please unbuckle your seat belt," along with or instead of flashing the indicator 73. The voice output device of the notification device 70 may also provide an audio notification, "Please unbuckle your seat belt."

[0121] Here, the control of the prime mover E1 by the control device 51 during operation will be explained using Figure 14. Figure 14 is a flowchart showing an example of the control of prime mover E1 during operation.

[0122] As shown in Figure 14, the control device 51 determines whether or not the prime mover E1 is operating (S21). For example, the control device 51 determines that the prime mover E1 is operating if the rotation of the prime mover E1 is detected by the rotation detection sensor that detects the rotation of the output shaft of the prime mover E1 (Yes in S21). Note that the prime mover E1 may also be considered to be operating if the rotation speed of the prime mover E1 is controlled by the rotation speed control unit 55. On the other hand, if the prime mover E1 is not operating (No in S21), the control device 51 terminates this process.

[0123] If the control device 51 determines that the prime mover E1 is operating (Yes in S21), it determines whether or not there has been a change in the state of the protection mechanism 6 based on the detection signal from the first detection device 80 (S22). If the detection signal from the first detection device 80 has not changed from ON to OFF and has not changed from OFF to ON, the control device 51 determines that there has been no change in the state of the protection mechanism 6 (No in S22).

[0124] If the control device 51 determines that there is no change in the state of the protection mechanism 6 (No in S22), it determines whether the protection mechanism 6 is in an active state (upper pipe 62 is in an upright position) (S23). If the detection signal from the first detection device 80 is ON, the control device 51 determines that the protection mechanism 6 is in an active state (Yes in S23).

[0125] If the control device 51 determines that the protection mechanism 6 is active (Yes in S23), it determines, based on the detection signal from the second detection device 90, whether the seat belt 154 has changed from an active state (attached state) to an unused state (unattached state) (S24). If the detection signal from the second detection device 90 has not changed from ON to OFF, the control device 51 determines that the seat belt 154 has not changed to an unused state (unattached state) (No in S13), and determines that the engine E1 should continue operating based on the determination conditions shown in Figure 13 (S25), and continues to operate the engine E1. In this case, the control device 51 does not display the indicator 73 on the notification device 70 (display device 71). In other words, the display device 71 turns off the indicator 73.

[0126] On the other hand, in S24, the control device 51 determines that the seat belt 154 has changed to an unused state (not fastened state) when the detection signal from the second detection device 90 changes from ON to OFF (Yes in S24), and determines that the prime mover E1 should be stopped based on the determination conditions shown in Figure 13 (S26), and stops the prime mover E1. In this case, the control device 51 lights up the indicator 73 in the notification device 70 (display device 71), as shown in Figure 11A. In other words, the display device 71 lights up the indicator 73.

[0127] On the other hand, in S23, if the control device 51 determines that the protection mechanism 6 is not in an active state (No in S23), it determines, based on the detection signal from the second detection device 90, whether or not the seat belt 154 has changed from an unused state (unattached state) to an used state (attached state) (S27).

[0128] If the detection signal from the second detection device 90 has not changed from OFF to ON, the control device 51 determines that the seat belt 154 has not changed to the usable state (worn state) (No in S27), and determines that the engine E1 should continue operating based on the determination conditions shown in Figure 13 (S25), and continues to operate the engine E1. In this case, the control device 51 does not display the indicator 73 on the notification device 70 (display device 71). In other words, the display device 71 turns off the indicator 73. After S25, the control device 51 returns to S21.

[0129] On the other hand, in S27, the control device 51 checks if the detection signal from the second detection device 90 is OFF or When the indicator changes to ON, the control device 51 determines that the seat belt 154 has changed to a usable state (worn state) (Yes in S27), and determines that the prime mover E1 should be stopped based on the determination conditions shown in Figure 13 (S28), and stops the prime mover E1. In this case, the control device 51 flashes the indicator 73 in the notification device 70 (display device 71) as shown in Figure 11B. In other words, the display device 71 puts the indicator 73 into a flashing state.

[0130] On the other hand, in S22, the control device 51 determines that there has been a change in the state of the protection mechanism 6 if the detection signal from the first detection device 80 changes from ON to OFF or from OFF to ON (Yes in S22).

[0131] The control device 51 determines whether the protective mechanism 6 has changed to a disabled state and whether the seat belt 154 is in use (worn) (S29). The control device 51 determines that the protective mechanism 6 has changed to a disabled state and the seat belt 154 is in use (worn) if the detection signal from the first detection device 80 has changed from ON to OFF and the detection signal from the second detection device 90 is ON (Yes in S29).

[0132] If the control device 51 determines that the protective mechanism 6 has changed to a disabled state and the seat belt 154 is in use (worn) (Yes in S29), it determines to stop the prime mover E1 based on the determination conditions shown in Figure 13 (S28), and stops the prime mover E1. In this case, the control device 51 makes the indicator 73 in the notification device 70 (display device 71) blink, as shown in Figure 11B. In other words, the display device 71 makes the indicator 73 blink.

[0133] On the other hand, if the control device 51 does not determine that the protection mechanism 6 has changed to an inactive state and the seat belt 154 is in use (attached) (No in S29), it determines whether the protection mechanism 6 has changed to an active state and the seat belt 154 is not in use (not attached) (S30). If the detection signal from the first detection device 80 changes from OFF to ON and the detection signal from the second detection device 90 is OFF, the control device 51 determines that the protection mechanism 6 has changed to an active state and the seat belt 154 is not in use (not attached) (Yes in S30), and determines to stop the prime mover E1 based on the determination conditions shown in Figure 13 (S26), and stops the prime mover E1. In this case, as shown in Figure 11A, the control device 51 lights up the indicator 73 in the notification device 70 (display device 71). In other words, the display device 71 lights up the indicator 73.

[0134] If the control device 51 does not determine that the protection mechanism 6 has changed to an active state and that the seat belt 154 is not in use (not fastened) (No in S30), it returns to S21.

[0135] After S26 or after S28, the control device 51 terminates this process.

[0136] The main characteristic features and effects of the work machine 1 in the embodiment described above are as follows.

[0137] (Item A1) A work machine 1 comprising a traveling device 10, a slewing body 2A rotatably supported on the traveling device 10 around a vertical axis, a driver's seat 4 provided on the slewing body 2A, a protective mechanism 6 that can be displaced between an effective state and an ineffective state other than the effective state, which can protect a driver seated in the driver's seat 4, and a first detection device 80 that detects the effective state and the ineffective state of the protective mechanism 6.

[0138] With this configuration, the first detection device 80 detects whether the protective mechanism 6 is active or inactive, so the work machine 1 can take appropriate action according to whether the protective mechanism 6 is active or inactive.

[0139] (Item A2) The work machine 1 according to Item A1, comprising a control device 51 that controls the operation of the work machine 1, wherein the control device 51 restricts the operation of the work machine 1 based on the detection result of the first detection device 80.

[0140] In this configuration, the control device 51 restricts the operation of the work implement 1 based on the detection result of the first detection device 80. Therefore, the work implement 1 can operate according to whether the protective mechanism 6 is enabled or disabled.

[0141] (Item A3) The work machine 1 according to item A1 or A2, comprising a safety device 154A that keeps the driver in the driver's seat 4, and a second detection device 90 that detects the state of use and non-use of the safety device 154A, wherein the control device 51 restricts the operation of the work machine 1 based on the detection results of the first detection device 80 and the second detection device 90.

[0142] With this configuration, the control device 51 restricts the operation of the work machine 1 based on the detection results of the first detection device 80 and the second detection device 90. Therefore, the work machine 1 can operate according to the combination of the enabled or disabled state of the protective mechanism 6 and the used or not used state of the safety device 154A.

[0143] (Item A4) The control device 51 prohibits the operation of the work machine 1 when the protective mechanism 6 is active and the safety device 154A is not in use, as described in Item A3.

[0144] With this configuration, the work machine 1 will not operate when the protective mechanism 6 is active and the safety device 154A is not in use, thus ensuring the safety of the operator.

[0145] (Item A5) The control device 51 does not prohibit the operation of the work machine 1 when the protective mechanism 6 is disabled and the safety device 154A is not in use, as described in Item A3.

[0146] With this configuration, the control device 51 does not prohibit the operation of the work implement 1 when the protective mechanism 6 is disabled and the safety device 154A is not in use. Therefore, the operator can operate the work implement 1 even when the protective mechanism 6 is disabled. In addition, since the use of the safety device 154A is not required when the protective mechanism 6 is disabled, the operator can leave the driver's seat 4 in an emergency and protect themselves when operating the work implement 1 with the protective mechanism 6 disabled.

[0147] (Item A6) The control device 51 prohibits the operation of the work machine 1 when the protective mechanism 6 is disabled and the safety device 154A is in use, as described in Item A4.

[0148] With this configuration, the work implement 1 will not operate when the protective mechanism 6 is disabled and the safety device 154A is in use. Therefore, when operating the work implement 1 with the protective mechanism 6 disabled, the danger caused by the operator being unable to leave the driver's seat 4 in an emergency can be eliminated.

[0149] (Item A7) The work machine 1 according to Item A6, comprising a notification device 70 that provides a first notification to encourage the use of the safety device 154A when the protective mechanism 6 is active and the safety device 154A is not in use, and a second notification to encourage the non-use of the safety device 154A when the protective mechanism 6 is deactivated and the safety device 154A is in use.

[0150] With this configuration, the notification device 70 can alert the driver that not using the safety device 154A is undesirable by issuing a first notification (for example, lighting the indicator 73) prompting the driver to use the safety device 154A when the protective mechanism 6 is active and the safety device 154A is not in use. Therefore, the driver can take prompt action to use the safety device 154A. Yes, it is possible. On the other hand, if the protective mechanism 6 is disabled and the safety device 154A is in use, the notification device 70 can make the driver aware that it is undesirable to use the safety device 154A by issuing a second notification (for example, flashing the indicator 73) to encourage the driver not to use the safety device 154A. As a result, the driver can quickly take action against the non-use of the safety device 154A.

[0151] (Item A8) The work machine 1 according to item A4 or A6, comprising a work device 20 provided on the rotating body 2A, a traveling device 10 and a prime mover E1 for supplying power to the work device 20, wherein the control device 51 prohibits the operation of the work machine 1 by prohibiting the driving of the prime mover E1.

[0152] With this configuration, by prohibiting the operation of the prime mover E1, the operation of the travel device 10 and the work device 20 of the work machine 1 can be stopped quickly and reliably, thereby ensuring the safety of the operator.

[0153] (Item A9) The work machine 1 according to item A4 or A6, comprising a work device 20 provided on the rotating body 2A, a prime mover E1 for supplying power to the traveling device 10 and the work device 20, and a hydraulic pump P driven by the power from the prime mover E1, wherein the traveling device 10 and the work device 20 are drivable based on hydraulic fluid from the hydraulic pump P, and the control device 51 stops the supply of hydraulic fluid from the hydraulic pump P to the traveling device 10 and the work device 20.

[0154] With this configuration, the operation of the travel device 10 and the work device 20 of the work machine 1 can be stopped quickly and reliably by applying a hydraulic lock, thereby ensuring the safety of the operator.

[0155] (Item A10) The work machine 1 described in Item A8, which, when the control device 51 receives a start command for the prime mover E1, starts the prime mover E1 if the protective mechanism 6 is active and the safety device 154A is in use, or if the protective mechanism 6 is inactive and the safety device 154A is not in use, and does not start the prime mover E1 if the protective mechanism 6 is active and the safety device 154A is not in use, or if the protective mechanism 6 is inactive and the safety device 154A is in use.

[0156] With this configuration, the work machine 1 will not operate when the protective mechanism 6 is active and the safety device 154A is not in use, or when the protective mechanism 6 is inactive and the safety device 154A is in use, thereby ensuring the safety of the operator.

[0157] (Item A11) The work machine 1 according to Item A10, comprising a notification device 70 that provides a first notification to encourage the use of the safety device 154A when the protective mechanism 6 is active and the safety device 154A is not in use, and a second notification to encourage the non-use of the safety device 154A when the protective mechanism 6 is deactivated and the safety device 154A is in use.

[0158] With this configuration, the notification device 70 can alert the driver that not using the safety device 154A is undesirable by issuing a first notification (e.g., lighting up the indicator 73) to encourage the use of the safety device 154A when the power engine E1 is started and the protective mechanism 6 is active and the safety device 154A is not in use. Therefore, the driver can quickly take action to use the safety device 154A when the power engine E1 is started. On the other hand, the notification device 70 can alert the driver that not using the safety device 154A is undesirable by issuing a second notification (e.g., flashing the indicator 73) to encourage the not use of the safety device 154A when the power engine E1 is started and the protective mechanism 6 is inactive and the safety device 154A is in use. Yes, it is possible. Therefore, the driver can quickly address the non-use of safety device 154A when starting engine E1.

[0159] (Item A12) The control device 51 stops the prime mover E1 when the protective mechanism 6 is active and the safety device 154A changes from an active state to an inactive state, when the protective mechanism 6 is deactivated and the safety device 154A changes from an inactive state to an active state, when the safety device 154A is in an active state and the protective mechanism 6 changes from an active state to an inactive state, or when the safety device 154A is in an inactive state and the protective mechanism 6 changes from an inactive state to an active state, according to item A8, A10, or A11.

[0160] With this configuration, the work machine 1 will not operate if the protective mechanism 6 is active and the safety device 154A changes from an active state to an inactive state, if the protective mechanism 6 is deactivated and the safety device 154A changes from an inactive state to an active state, if the safety device 154A is in use and the protective mechanism 6 changes from an active state to an inactive state, or if the safety device 154A is in inactive and the protective mechanism 6 changes from an inactive state to an active state, thus ensuring the safety of the operator.

[0161] (Item A13) The work machine 1 according to Item A12, comprising a notification device 70 that provides a first notification to encourage the use of the safety device 154A when the protective mechanism 6 is in an active state and the safety device 154A changes from an active state to an inactive state, or when the safety device 154A is in an inactive state and the protective mechanism 6 changes from an inactive state to an active state, and provides a second notification to encourage the non-use of the safety device 154A when the protective mechanism 6 is in an inactive state and the safety device 154A changes from an inactive state to an active state, or when the safety device 154A is in an active state and the protective mechanism 6 changes from an active state to an inactive state.

[0162] With this configuration, the notification device 70 can alert the driver that not using the safety device 154A is undesirable by providing a first notification (e.g., lighting up the indicator 73) to encourage the use of the safety device 154A when the protective mechanism 6 is active and the safety device 154A changes from an active state to an unused state, or when the safety device 154A is unused and the protective mechanism 6 changes from an inactive state to an active state, while the prime mover E1 is in operation. Therefore, the driver can quickly take action regarding the use of the safety device 154A while the prime mover E1 is in operation. On the other hand, the notification device 70 can alert the driver that not using the safety device 154A is undesirable by providing a second notification (e.g., flashing the indicator 73) to encourage the use of the safety device 154A when the protective mechanism 6 is inactive and the safety device 154A changes from an unused state to an active state, or when the safety device 154A is in use and the protective mechanism 6 changes from an active state to an inactive state, while the prime mover E1 is in operation. Therefore, the driver can quickly address the non-use of the safety device 154A while the engine E1 is operating.

[0163] (Item A14) The protective mechanism 6 comprises a lower pipe 61 erected on the swivel body 2A, an upper pipe 62 located above the lower pipe 61, and a hinge portion 63 that rotatably supports the upper pipe 62 relative to the lower pipe 61. The lower pipe 61 comprises a first electric wire 611 inserted into the pipe, and a first support member 613 that supports a first contact 612 connected to the tip of the first electric wire 611 at the upper end position of the lower pipe 61. The upper pipe 62 comprises a lighting fixture 621, a second electric wire 622 with one end connected to the lighting fixture 621 and inserted into the pipe, and a second support member 624 that supports a second contact 623 connected to the other end of the second electric wire 622 at the lower end position of the upper pipe 62. The work machine 1 according to any one of items A1 to A13, comprising, wherein the hinge portion 63 rotatably supports the upper pipe 62 so that it can be displaced between an upright position in which the lower end of the upper pipe 62 is connected to the upper part of the lower pipe 61 and a tilted position in which the upper pipe 62 is tilted by disconnecting the lower end of the upper pipe 62 to the upper part of the lower pipe 61, the effective state is when the upper pipe 62 is in the upright position, the ineffective state is when the upper pipe 62 is in the tilted position, the first contact 612 and the second contact 623 are in contact in the upright position, and the first contact 612 and the second contact 623 are not in contact in the tilted position.

[0164] With this configuration, cables (first wire 611 and second wire 622) connected to an electrical appliance (e.g., lighting fixture 621) installed in the upper pipe 62 are provided inside the lower pipe 61 and upper pipe 62 that constitute the protective mechanism 6. As a result, the lower pipe 61 and upper pipe 62 can protect the cables, and the protective mechanism 6 can be made more compact compared to when the cables are routed outside the protective mechanism 6 along the length of the pipe. Furthermore, when displacing the protective mechanism 6 between the effective state (upright position of the upper pipe 62) and the ineffective state (tilted position of the upper pipe 62), there is no need for the worker to connect and disconnect the first wire 611 in the lower pipe 61 and the second wire 622 in the upper pipe 62, making it very convenient.

[0165] (Item A15) The protective mechanism 6 comprises a lower member (e.g., lower pipe 61) erected on the swivel body 2A, an upper member (e.g., upper pipe 62) located above the lower member, and a hinge portion 63 that rotatably supports the upper member relative to the lower member, wherein the hinge portion 63 allows the upper member to stand upright when the lower end of the upper member is connected to the upper part of the lower member, and allows the upper member to tilt when the lower end of the upper member is not connected to the upper part of the lower member. The work machine 1 according to any one of items A1 to A14, wherein the upper member is rotatably supported so as to be displaceable between a tilted position and an upright position, the effective state is when the upper member is in the upright position, and the ineffective state is when the upper member is in the tilted position, and the first detection device 80 comprises a sensor unit 81 provided on one of the lower member and the upper member, and a target unit 82 provided on the other of the lower member and the upper member and detected by the sensor unit 81.

[0166] With this configuration, the first detection device 80 can suitably detect, by means of the sensor unit 81 and the object unit 82, whether the upper member (e.g., upper pipe 62) is in an upright position relative to the lower member (e.g., lower pipe 61) or in a tilted position. Note that the lower member and upper member are not limited to pipes, but can also be angles such as U-shaped or L-shaped, or H-shaped (H-shaped) beams. Support members made of materials such as steel may also be used.

[0167] In the above embodiment, the work machine 1 is configured to drive the first hydraulic pump P1, the second hydraulic pump P2, and the third hydraulic pump P3 with the power of the prime mover E1. However, it may also be an electric type or a hybrid type equipped with a drive battery and an electric motor instead of or in addition to the prime mover E1. In this case, the work machine 1 drives the electric motor with power from the drive battery, drives the first hydraulic pump P1, the second hydraulic pump P2, and the third hydraulic pump P3 with the power of the electric motor, drives the hydraulic actuators (boom cylinder C1, bucket cylinder C2, dozer cylinder C3, swing cylinder C4, arm cylinder C9), the left travel motor ML, the right travel motor MR, and the slewing motor MT with the hydraulic fluid discharged from the first hydraulic pump P1 and the second hydraulic pump P2, and drives the work device 20 and the travel device 10 with the power of the hydraulic actuators (boom cylinder C1, bucket cylinder C2, dozer cylinder C3, swing cylinder C4, arm cylinder C9), the left travel motor ML, the right travel motor MR, and the slewing motor MT.

[0168] Furthermore, the work machine 1 may be configured such that some or all of the actuators provided in the work device 20 and the travel device 10 are electric actuators, and these electric actuators are driven by battery power, thereby driving the work device 20 and the travel device 10. For example, the work machine 1 may be configured such that all actuators are electric actuators, or it may be configured to have at least one electric motor for driving the hydraulic pump and an electric motor for slewing. That's fine.

[0169] In the above embodiment, the implement 1 is a model with a swing function, but it may also be a model without a swing device (swing cylinder C4), that is, a model without a swing function (such as an ultra-short swing machine). Furthermore, the implement 1 may be a two-piece boom type, regardless of whether it has a swing function or not.

[0170] In the embodiments described above, examples of applying the present invention to a work machine 1 such as a backhoe were explained, but the application of the present invention is not limited to this, and it may also be applied to other construction machinery such as wheel loaders, compact track loaders, and skid steer loaders.

[0171] Although the present invention has been described above, the embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of Symbols]

[0172] 1. Work machine 2A rotating body 4. Driver's seat 6 Protection mechanism 10. Traveling device 15A Safety equipment 20 Working equipment 51 Control device 61 Lower pipe 62 Upper pipe 51 Hinge section 63. Notification device 80 First detection device 81 Sensor section 82 Target part 83 Position adjustment section 90 Second detection device 611 First Electric Wire 612 First contact 613 1st support 621 Lighting fixtures 622 Second Electric Line 623 Second contact point 624 Second support E1 Engine P Hydraulic pump

Claims

1. Traveling device and A rotating body is supported on the aforementioned traveling device so as to be rotatable around a vertical axis, The driver's seat provided in the aforementioned rotating body, A protective mechanism that can be displaced between an effective state capable of protecting the driver seated in the driver's seat and an ineffective state other than the effective state, A work machine comprising a first detection device for detecting the active and inactive states of the protective mechanism.

2. Equipped with a control device that controls the operation of the work machine, The control device restricts the operation of the work machine based on the detection result of the first detection device, as described in claim 1.

3. A safety device that keeps the driver in the driver's seat, The system includes a second detection device that detects the state of use and non-use of the safety device. The work machine according to claim 2, wherein the control device restricts the operation of the work machine based on the detection results of the first detection device and the second detection device.

4. The control device prohibits the operation of the work machine when the protective mechanism is active and the safety device is not in use, according to claim 3.

5. The work machine according to claim 3, wherein the control device does not prohibit the operation of the work machine when the protective mechanism is disabled and the safety device is not in use.

6. The work machine according to claim 4, wherein the control device prohibits the operation of the work machine when the protective mechanism is disabled and the safety device is in use.

7. The work machine according to claim 6, further comprising a notification device that provides a first notification prompting the use of the safety device when the protective mechanism is active and the safety device is not in use, and a second notification prompting the non-use of the safety device or the use of the protective mechanism when the protective mechanism is deactivated and the safety device is in use.

8. A work device provided on the aforementioned rotating body, The vehicle comprises a prime mover for supplying power to the aforementioned traveling device and the aforementioned working device, The work machine according to claim 4 or 6, wherein the control device prohibits the operation of the work machine by prohibiting the driving of the prime mover.

9. A work device provided on the aforementioned rotating body, A prime mover for supplying power to the aforementioned traveling device and the aforementioned working device, The system includes a hydraulic pump driven by power from the aforementioned prime mover, The aforementioned traveling device and the aforementioned working device are driven based on the hydraulic fluid from the hydraulic pump, The work machine according to claim 4 or 6, wherein the control device stops the supply of hydraulic fluid from the hydraulic pump to the travel device and the work device.

10. The work machine according to claim 8, wherein the control device, upon receiving a command to start the prime mover, starts the prime mover if the protective mechanism is active and the safety device is in use, or if the protective mechanism is inactive and the safety device is not in use, and does not start the prime mover if the protective mechanism is active and the safety device is not in use, or if the protective mechanism is inactive and the safety device is in use.

11. The work machine according to claim 10, further comprising a notification device that provides a first notification to encourage the use of the safety device when the protective mechanism is active and the safety device is not in use, and a second notification to encourage the non-use of the safety device when the protective mechanism is inactive and the safety device is in use.

12. The work machine according to claim 8, wherein the control device stops the prime mover when the protective mechanism is active and the safety device changes from an active state to an inactive state, when the protective mechanism is deactivated and the safety device changes from an inactive state to an active state, when the safety device is in an active state and the protective mechanism changes from an active state to an inactive state, or when the safety device is in an inactive state and the protective mechanism changes from an inactive state to an active state.

13. The work machine according to claim 12, further comprising a notification device that provides a first notification to encourage the use of the safety device when the protective mechanism is in an active state and the safety device changes from an active state to an inactive state, or when the safety device is in an inactive state and the protective mechanism changes from an inactive state to an active state, and provides a second notification to encourage the non-use of the safety device when the protective mechanism is in an inactive state and the safety device changes from an inactive state to an active state, or when the safety device is in an active state and the protective mechanism changes from an active state to an inactive state.

14. The protective mechanism comprises a lower pipe erected on the rotating body, an upper pipe located above the lower pipe, and a hinge portion that rotatably supports the upper pipe relative to the lower pipe. The lower pipe comprises a first electric wire inserted inside the pipe and a first support that supports a first contact connected to the tip of the first electric wire at the upper end of the lower pipe. The upper pipe comprises a lighting fixture, a second electric wire with one end connected to the lighting fixture and inserted into the pipe, and a second support that supports a second contact connected to the other end of the second electric wire at the lower end of the upper pipe. The hinge portion supports the upper pipe so that it can rotate, allowing it to be displaced between an upright position where the upper pipe is standing upright by connecting the lower end of the upper pipe to the upper part of the lower pipe, and a tilted position where the upper pipe is tilted by detaching the lower end of the upper pipe from the upper part of the lower pipe. The effective state is when the upper pipe is in the upright position, and the ineffective state is when the upper pipe is in the tilted position. The work machine according to claim 1, wherein in the upright position the first contact and the second contact are in contact, and in the tilted position the first contact and the second contact are not in contact.

15. The protection mechanism comprises a lower member erected on the swivel body, an upper member located above the lower member, and a hinge portion that rotatably supports the upper member relative to the lower member. The hinge portion supports the upper member so that it can rotate, allowing it to move between an upright position where the upper member is standing upright by connecting the lower end of the upper member to the upper part of the lower member, and a tilted position where the upper member is tilted by detaching the lower end of the upper member from the upper part of the lower member. The effective state is when the upper member is in the upright position, and the ineffective state is when the upper member is in the tilted position. The work machine according to claim 1, wherein the first detection device comprises a sensor unit provided on one of the lower member and the upper member, and an object to be detected by the sensor unit, provided on the other of the lower member and the upper member.

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