Fluid discharge unit and work machine

Abstract

To provide a fluid discharge unit which can perform fluid discharging that can approximately cover a region where powder dust occurs, and a work machine.SOLUTION: A fluid discharge unit 130, which is mounted on an arm body 106 of a work machine 100, comprises a discharging nozzle 140 which is arranged in front of a tip part 112A of the arm body 106 and can change a fluid-discharging direction to a direction of a working attachment 120 that is turnably supported on the tip part 112A. The fluid discharge unit 130 comprises: a swivel joint structure 138 which includes a rotation-side body 138B that is communicated with the discharging nozzle 140 to support the nozzle and a stationary-side body 138A that rotatably supports the rotation-side body 138B; a first electric direct-acting mechanism 144 that includes a first support part 144C and a first movable part 144D that is supported on the first support part 144C to be movable linearly; and a first rotating mechanism 146 that converts a linear movement of the first movable part 144D to a rotary movement to rotationally displace the rotation-side body 138B.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a fluid discharge unit and a work machine. [Background technology]

[0002] Patent Document 1 discloses a work machine used for civil engineering, construction, and demolition work. The work machine in Patent Document 1 is configured to wet the area near the crushing arms (blade sections) of the work attachment using a water spray nozzle supported on the frame of the work attachment, allowing for efficient spraying of water on the parts of the object that actually come into contact with the crushing arms. This makes it possible to conserve water while efficiently preventing dust from being generated on the parts of the object that actually come into contact with the crushing arms. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-287214 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, dust does not only occur from the parts of the object that actually come into contact with the crushing arms. For example, dust may occur from parts that are simply in contact with the outside of the work attachment, or dust may be generated by deformation or crushing that occurs in parts other than those in contact with the crushing arms. In other words, the spray range of the water spray nozzle in Patent Document 1 is sometimes too narrow, and dust generation cannot be effectively reduced in some cases.

[0005] SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has an object to provide a fluid discharge unit and a work machine that can discharge fluid to adequately cover areas where dust is generated. [Means for solving the problem]

[0006] The present invention solves the above problem by providing a fluid discharge unit that is attached to the arm body of a work machine, and that is equipped with a discharge nozzle that is positioned in front of the tip of the arm body and can change the direction of fluid discharge toward a work attachment that is rotatably supported at the tip.

[0007] In this invention, the fluid discharge unit attached to the arm of the work machine is positioned in front of the tip of the arm. This makes it possible to widen the range over which fluid is discharged to a certain extent. The fluid discharge unit is equipped with a discharge nozzle that can change the direction of fluid discharge toward the work attachment that is rotatably supported at the tip. This makes it possible to include objects that the work attachment comes into contact with in the range over which fluid is discharged. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a fluid discharge unit and a work machine that realizes fluid discharge that can adequately cover an area where dust is generated. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing an example of a work machine in which a fluid discharge unit according to a first embodiment of the present invention is attached to an arm body; [Figure 2] FIG. 2 is a schematic diagram showing an example of a configuration for attaching the fluid discharge unit of FIG. 1 to an arm body; [Figure 3] 2A and 2B are perspective views showing the fluid discharge unit of FIG. 1 (a view from the slightly forward side of the arm body side, and a view from the slightly rearward side of the opposite arm body side). [Figure 4] Schematic diagram showing the fluid discharge unit of FIG. 1 (side view of the side opposite to the arm body (A), top view (B), side view of the arm body side (C)) [Figure 5] Block diagram of the fluid delivery unit of FIG. [Figure 6] 1 is a block diagram of a fluid discharge unit according to a second embodiment of the present invention; [Figure 7]FIG. 10 is a schematic diagram showing an example of a work machine in which a fluid discharge unit according to a third embodiment of the present invention is attached to an arm body. [Figure 8] FIG. 10 is a schematic diagram showing an example of a work attachment according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] An example of a first embodiment of the present invention will be described in detail below with reference to the drawings.

[0011] First, the configuration of a work machine 100 according to this embodiment will be described with reference to Figure 1. This work machine 100 can be widely used in industries such as building demolition and renovation, and waste disposal.

[0012] As shown in FIG. 1 , the work machine 100 comprises a main body 101, an arm body 106 swingably supported on the main body 101, a work attachment 120 swingably supported on the arm body 106, and a fluid discharge unit 130 (in other words, the work machine 100 comprises the arm body 106 that rotatably supports the work attachment 120). The main body 101 comprises a crawler-type lower traveling body 102, a swivel mechanism 103, and an upper rotating body 104. The upper rotating body 104 is rotatable relative to the lower traveling body 102 by the swivel mechanism 103. A driver's seat 105 is provided on the upper rotating body 104. The driver's seat 105 is configured to be sealed, so that it can be protected from rain and wind and the temperature can be adjusted with an air conditioner. Of course, the work machine 100 may be operated remotely and unmanned. The arm body 106, which can swing up and down, is attached to the upper rotating body 104.

[0013] As shown in Figure 1, the arm body 106 includes a boom 108 connected to the upper rotating body 104, and an arm 112 connected to the tip of the boom 108. Both the boom 108 and the arm 112 have hollow portions therein, which allows them to be lightweight while maintaining rigidity. The arm 112 is made swingable by a boom cylinder 110. A work attachment 120 is connected to a tip 112A of the arm 112. The work attachment 120 is made swingable by an arm cylinder 114 via a link member 116.

[0014] 1, the work attachment 120 is, for example, a steel frame cutter, and includes a bracket 122 and two cutting edges 124 rotatably supported on the bracket 122. The bracket 122 is rotatably supported by a support shaft 122A provided at the tip 112A of the arm 112, and is capable of swinging on a link shaft 122B whose position changes in response to the extension and retraction of the arm cylinder 114. Therefore, the direction of the work attachment 120 relative to the arm 112 can be determined from the amount of rotation of the work attachment 120 about the support shaft 122A or link shaft 122B, the amount of rotation of the link member 116, or the amount of extension and retraction of the arm cylinder 114.

[0015] Next, the fluid discharge unit 130 will be briefly described.

[0016] 1, the fluid discharge unit 130 is attached, for example, to the attachment pipe 118 attached to the arm 112 (it may also be attached directly to the arm 112). In other words, the fluid discharge unit 130 is attached to the arm body 106 of the work machine 100. In this case, as shown in FIGS. 1 and 2, the fluid discharge unit 130 is attached to the right side of the arm body 106 when facing the work machine 100. The fluid discharge unit 130 is disposed in front of the tip end 112A of the arm body 106 and is equipped with a discharge nozzle 140 that can change the direction of fluid discharge toward the work attachment 120 that is rotatably supported on the tip end 112A. In other words, the work machine 100 can be said to be configured with a fluid discharge unit 130 that is disposed in front of the tip end 112A of the arm body 106 and is equipped with a discharge nozzle 140 that can change the direction of fluid discharge toward the work attachment 120. The attachment piping 118 is a piping that transmits hydraulic pressure for driving the blade portion 124 of the work attachment 120 .

[0017] As shown in FIG. 2, the fluid discharge unit 130 and the attachment pipe 118 are connected by a flexible clamp CLA, an L-shaped pipe TB, and a clamp CLB. The flexible clamp CLA is a clamp that includes a pipe clamp CL1 and a pipe clamp CL2, and the connection angle between the pipe clamps can be freely changed. In this embodiment, the pipe clamp CL1 clamps the attachment pipe 118, and the pipe clamp CL2 clamps the left end of the L-shaped pipe TB, with the pipe clamps CL1 and CL2 fixed so that they are approximately perpendicular to each other. The clamp CLB is fixed to the fluid discharge unit 130 in advance and clamps the right end of the L-shaped pipe TB.

[0018] Next, the fluid discharging unit 130 will be described in detail.

[0019] As shown in FIGS. 2 to 5 , the fluid discharge unit 130 includes a flow path constructing body 134, a discharge nozzle 140, a first electric linear motion mechanism 144, a first rotation mechanism 146, a second electric linear motion mechanism 150, a second rotation mechanism 152, a control unit 156, a communication unit 158, and a battery unit 160. The control unit 156, the communication unit 158, and the battery unit 160 are housed in an electrical equipment box 154 disposed near the flow path constructing body 134. A pipe (not shown) is connected to a fluid inlet 134A of the flow path constructing body 134, through which a fluid is introduced. The fluid is water pumped from a pump unit (not shown) provided on the main body 101 (the pump unit may be disposed at a location remote from the work machine 100), but may also be an aqueous solution that becomes foamy when discharged from the discharge nozzle 140.

[0020] As shown in Figures 3(B) and 4(A), the flow path constituent 134 is fixed to the support plate 132 by, for example, two fasteners (here, U-bolts) UB. The flow path constituent 134 includes an on-off valve 136, a swivel joint constituent 138, and a discharge nozzle 140. The on-off valve 136 is, for example, a ball valve, and controls the amount of fluid discharged. The on-off valve 136 is opened and closed by a second electric linear motion mechanism 150 attached to the back side of the flow path constituent 134 via a circular opening 132A provided in the support plate 132. The swivel joint structure 138 comprises a fixed-side body 138A connected to the on-off valve 136, and a rotating-side body 138B rotatably supported by the fixed-side body 128A (i.e., the swivel joint structure 138 comprises a rotating-side body 138B that communicates with and supports the discharge nozzle 140, and a fixed-side body 138A that rotatably supports the rotating-side body 138B). The rotation angle of the rotating-side body 138B is controlled by a first electric linear motion mechanism 144. The discharge nozzle 140 is supported in communication with the rotating-side body 138B.

[0021] As shown in FIGS. 3(A) and 4(C), the first electric linear motion mechanism 144 (second electric linear motion mechanism 150) is pivotally supported by a support pin 142 (148) provided on the back side of the flow path constituent 134 in the support plate 132. The first electric linear motion mechanism 144 (second electric linear motion mechanism 150) includes an attachment portion 144A (150A), a motor portion 144B (150B), a first support portion 144C (second support portion 150C), and a first movable portion 144D (second movable portion 150D). The attachment portion 144A (150A) is a member that connects the motor portion 144B (150B) and the first support portion 144C (second support portion 150C), and houses a speed change mechanism and the like inside. In addition, a through hole (not shown) is provided at the end of the mounting portion 144A (150A), which allows the first electric linear motion mechanism 144 (second electric linear motion mechanism 150) to be pivotally supported by the support pin 142 (148) attached to the support plate 132.

[0022] The motor section 144B (150B) shown in Figures 3(A) and 4(C) houses, for example, an electric motor. The first support section 144C (second support section 150C) houses, for example, a ball screw, and rotation of the electric motor is converted into rotation of the ball screw. The first movable section 144D (second movable section 150D) is supported by the first support section 144C (second support section 150C) so as to be linearly movable in the direction of the movement axis Or (On) as shown in Figure 4(C) by rotation of the ball screw.

[0023] As shown in FIGS. 3(A) and 4(C), the first rotation mechanism 146 converts the linear movement of the first movable part 144D into rotational motion, and rotates and displaces the rotation-side body 138B, thereby tilting the discharge nozzle 140. Specifically, the first rotation mechanism 146 includes a connecting part 146A, a pin 146B, and a first lever part 146C. One end of the connecting part 146A is attached to the first movable part 144D by the pin 146B. A protrusion 146AA is provided on a portion of the connecting part 146A. The protrusion 146AA is also attached to the first lever part 146C by the pin PN (FIG. 4(C)). The first lever part 146C is attached to the rotation-side body 138B of the swivel joint structure 138. That is, the first lever portion 146C is provided on the rotating body 138B, and the first rotation mechanism 146 is configured to include a connecting portion 146A and a pin 146B (first connecting portion) that connect the first movable portion 144D and the first lever portion 146C. Therefore, the movement axis Or swings slightly around the support pin 142 when the first movable portion 144D moves.

[0024] As shown in Figures 3(A) and 4(C), the second rotation mechanism 152 converts the linear movement of the second movable part 150D into rotational movement to open and close the on-off valve 136, which limits the amount of fluid released from the discharge nozzle 140. Specifically, the second rotation mechanism 152 includes a connecting part 152A, a pin 152B, and a second lever part 152C. One end of the connecting part 152A is attached to the second movable part 150D by the pin 152B. The other end of the connecting part 152A is attached to the second lever part 152C by a pin (not shown). The second lever part 152C is attached to the on-off shaft of the on-off valve 136. That is, in this embodiment, the opening / closing shaft of the opening / closing valve 136 is provided with a second lever portion 152C, and the second rotation mechanism 152 is configured to include a connecting portion 152A and a pin 152B (second connecting portion) that connect the second movable portion 150D and the second lever portion 152C. Therefore, when the second movable portion 150D moves, the moving axis On swings slightly around the support pin 148.

[0025] As shown in FIG. 5 , the control unit 156 is connected to the first and second electric linear motion mechanisms 144, 150, and is capable of controlling the first and second electric linear motion mechanisms 144, 150 in accordance with instructions from the communication unit 158. The communication unit 158 communicates with a remotely located controller (not shown). In this embodiment, wireless communication is possible, and the controller is operated by an operator in the driver's seat 105 (although not limited to this, the controller may be operated by an operator away from the work machine 100). The controller is portable and is capable of changing the direction of the discharge nozzle 140 that discharges fluid and controlling the amount of fluid discharged. Note that, because the controller is operated from the driver's seat 105, it is not necessarily wireless and may be wired. The battery unit 160 is connected to the control unit 156 and the wireless unit 158. Note that, although not shown, the battery unit 160 also supplies power to the first and second electric linear motion mechanisms 144, 150. In this embodiment, a battery (such as a primary battery or a secondary battery including a Li-ion battery, a lead-acid battery, a Ni-Cd battery, or a vanadium battery) can be used for the battery section 160. In this embodiment, coupled with the fact that the communication section 158 is wireless, wiring is not exposed to the outside of the fluid discharging unit 130, making it easy to attach and detach the fluid discharging unit 130. However, without being limited to this, the battery section may be a power adapter, and the power supply for the main body may be brought in via wiring.

[0026] As described above, in this embodiment, the fluid discharge unit 130 attached to the arm body 106 of the work machine 100 is positioned in front of the tip end 112A of the arm body 106. This makes it possible to widen the range over which fluid is discharged to a certain extent. The fluid discharge unit 130 is also provided with a discharge nozzle 140 that can change the direction of fluid discharge toward the work attachment 120, which is rotatably supported on the tip end 112A. This makes it possible to include objects that the work attachment 120 comes into contact with in the range over which fluid is discharged.

[0027] Furthermore, in this embodiment, the fluid discharge unit 130 includes a swivel joint structure 134, a first electric linear motion mechanism 144, and a first rotation mechanism 146. The first rotation mechanism 146 converts the linear movement of the first movable part 144D into rotational motion, thereby rotationally displacing the rotating body 138B. In other words, since the pressure fluctuations of the fluid are applied in the direction of the rotation axis (Y direction) of the rotating body 138B, the pressure fluctuations do not have much effect around the rotation axis of the swivel joint structure 138B. This makes it possible to minimize the tolerance range for fluid pressure fluctuations in the output of the first electric linear motion mechanism 144. At the same time, because it is the first electric linear motion mechanism 144 that rotates the discharge nozzle 140, there is no need to provide a separate limit switch for limiting the direction of the discharge nozzle 140, as is the case with a rotation device, which allows for cost reduction. Furthermore, when the rotating shaft of the rotating body 138B is directly rotated by an electric motor or the like, the labor and configuration required for shaft alignment is required, but this can be eliminated, and assembly can be simplified. However, this is not limited to this, and a structure may be provided in which a swivel joint structure is provided, or the rotating body is directly rotated by a rotary motor. Of course, a structure that does not use a swivel joint structure may also be used.

[0028] In this embodiment, the rotating body 138B is provided with a first lever 146C, and the first rotation mechanism 146 includes a connecting portion 146A and a pin 146B (first connecting portion) that connect the first movable portion 144D and the first lever 146C. This allows the first rotation mechanism 146 to have a simple configuration, making it possible to reduce the size and cost. However, this is not limiting, and other configurations may also be used; for example, the first rotation mechanism may be configured using a rack and pinion.

[0029] In this embodiment, the fluid discharge unit 130 further includes an on-off valve 136 that controls the amount of fluid discharged. This allows the fluid to be discharged more quickly and accurately than if the amount of fluid discharged were limited by a pump unit. However, this is not limiting, and the on-off valve may be omitted.

[0030] Furthermore, this embodiment includes a second electric linear motion mechanism 150 and a second rotation mechanism 152 that converts the linear movement of the second movable part 150D into rotational movement to open and close the on-off valve 136. Therefore, unlike a rotation device, it is not necessary to provide a separate limit switch in the second electric linear motion mechanism 150, which allows for cost reduction. Furthermore, when the on-off valve 136 is directly rotated by an electric motor or the like, the labor and configuration required for axis alignment is required, but this is not necessary, and a simple configuration with easy assembly is also possible. However, the present invention is not limited to this, and the on-off valve may also be configured to be directly rotated by a rotary motor.

[0031] In this embodiment, the opening / closing shaft of the on-off valve 136 is provided with a second lever portion 152C, and the second rotation mechanism 152 includes a connecting portion 152A and a pin 152B (second connecting portion) that connect the second movable portion 150D and the second lever portion 152C. This allows the second rotation mechanism 152 to have a simple configuration, and allows for easy axial alignment with the opening / closing shaft of the on-off valve 136. In other words, miniaturization and cost reduction are possible. However, the second rotation mechanism is not limited to this, and may be configured with other structures, for example, a rack and pinion.

[0032] In this embodiment, the ends of the mounting portions 144A and 150A are pivotally supported so as to be rotatable. This facilitates the mounting of the first electric linear motion mechanism 144 and the second electric linear motion mechanism 150. However, this is not limiting, and only one of the mounting portions may be pivotally supported, or neither may be pivotally supported.

[0033] Furthermore, in this embodiment, the first electric linear motion mechanism 144 and the second electric linear motion mechanism 150 are arranged in the same direction within the support plate 132. Therefore, it is possible to simultaneously address factors that cause performance degradation of the first electric linear motion mechanism 144 and the second electric linear motion mechanism 150 due to changes in the external environment. Specifically, the directions of the gaps between the first and second movable parts 144D, 150D and the first and second support parts 144C, 150C can be oriented in the same direction, and for example, a shielding plate (not shown) or the like can be arranged on the back of the discharge nozzle 140 to effectively block moisture that may flow into the first electric linear motion mechanism 144 and the second electric linear motion mechanism 150 through the gaps. At the same time, it is possible to further reduce the size and weight. It is to be noted that this is not limited to this, and the first electric The linear motion mechanism and the second electric linear motion mechanism may be arranged so that their orientations are different.

[0034] In addition, in this embodiment, the fluid is water, which is easy to handle, can effectively reduce the scattering of dust, can widen the range in which the fluid can be discharged, and can simplify the configuration of the fluid discharge unit 130 compared to when a foam-like material is used.

[0035] Furthermore, in this embodiment, the fluid discharge unit 130 is attached to the right side of the arm body 106 as one faces the work machine 100. In this case, the fluid discharge unit 130 can be clearly seen from the driver's seat 105, reducing the possibility of the fluid discharge unit 130 colliding with an object that it should not come into contact with. In other words, damage to the fluid discharge unit 130 can be prevented. However, this is not limited to this, and the fluid discharge unit may be attached to the left side of the arm body as one faces the work machine. In that case, even when the fluid discharge unit is discharging fluid, the work being performed with the work attachment can be clearly seen from the driver's seat, making it possible to perform the work efficiently. Of course, the fluid discharge unit may also be attached to the upper or lower side of the arm body as one faces the work machine.

[0036] Therefore, according to this embodiment, it is possible to provide a fluid discharge unit 130 and a work machine 100 that can discharge fluid to adequately cover areas where dust is generated.

[0037] Although the present invention has been described using the first embodiment, the present invention is not limited to the first embodiment. In other words, it goes without saying that improvements and design changes are possible within the scope of the present invention.

[0038] For example, in the first embodiment, the direction of the discharge nozzle 140 can be changed by a controller (not shown), but the present invention is not limited to this. For example, it may be as shown in the second embodiment shown in Fig. 6. In the second embodiment, a sensor 262 is connected to the control unit 256. Note that in the second embodiment, only the sensor 262 is different, so one digit above the reference numeral is changed, and explanations other than those related to the second embodiment will be omitted.

[0039] In this embodiment, the fluid discharge unit 230 is equipped with a sensor 262 capable of detecting the direction of the work attachment, and the direction of the discharge nozzle is controlled in accordance with the output signal of the sensor 262. The sensor 262 may be a rotary encoder disposed on the support shaft, link shaft, or link member, or a linear encoder that detects the extension / retraction state of the arm cylinder. From the output of the sensor 262, the processing unit 256 determines the direction of the work attachment relative to the arm and drives the discharge nozzle based on that. At this time, the controller may be configured to select whether to prioritize the output of the sensor 262.

[0040] In this embodiment, the fluid discharge direction can be changed automatically to follow the movement of the work attachment, making it possible to discharge the fluid more efficiently and with less effort.

[0041] In the above embodiment, the work machine 100 is relatively small, but the present invention is not limited to this. For example, it may be as shown in the third embodiment shown in Figure 7. In the third embodiment, a larger work machine 300 is used, and the work attachment 320 is also a large concrete crusher. In the third embodiment, the only difference from the work machines of the first and second embodiments is the size, and therefore only one digit above the reference numerals is changed, and other explanations will be omitted.

[0042] Furthermore, in the above-described embodiments, the work attachment is a steel frame cutter or a large concrete crusher, but the present invention is not limited to this. For example, a work attachment called a "small breaker" that breaks concrete into small pieces, as shown in FIG. 8, may be used. Of course, other attachments may also be used. In this embodiment, the work machine is a backhoe, but similar effects can be obtained when the work machine is applied to, for example, a pile driver, pile extractor, bulldozer, tractor shovel, power shovel, dragline, clamshell, crawler drill, earth drill, crane, road cutter, breaker, etc. In short, the present invention can be widely applied to work machines that perform work that may generate dust, such as in civil engineering work, construction work, and demolition work. [Industrial Applicability]

[0043] The present invention can be widely used in work sites where dust is generated, such as civil engineering work, construction work, and demolition work, but is particularly suitable for demolition work and repair work of solid structures. [Explanation of symbols]

[0044] 100, 300...Work machinery 101...Main body 102...undercarriage 103...Swivel mechanism 104...Upper rotating body 105...Driver's seat 106, 306...Arm body 108...Boom 110...Boom cylinder 112, 312...Arm 112A...Tip 114...Arm cylinder 116...Link member 118...Attachment piping 120, 320, 420...Work attachments 122...Bracket 122A…Support shaft 122B...Link shaft 124...Blade 130, 230, 330...Fluid discharge unit 132...Support plate 132A…Opening 134...flow path structure 134A...Fluid inlet 136...Shut-off valve 138...Swivel joint structure 138A...Fixed body 138B...Rotating body 140...Discharge nozzle 142, 148...Support pins 144, 244...First electric linear mechanism 144A, 150A... Mounting section 144B, 150B...Motor section 144C…1st support part 144D…First movable part 146...First rotation mechanism 146A, 152A...Connection part 146AA…Convex part 146B, 152B...pin 146C...First lever part 150, 250...Second electric linear mechanism 150C…Second support part 150D…Second movable part 152...Second rotation mechanism 152C...Second lever part 154, 254...Electrical box 156, 256...Control section 158, 258…Communications Department 160, 260...Battery section 262...Sensor CL1, CL2...Piping clamp CLA...Free clamp CLB...Clamp PN...Pin On, Or…Movement axis TB…L type piping UB…Fixing tool

Claims

1. A fluid discharge unit attached to an arm body of a work machine, a discharge nozzle disposed in front of the tip of the arm body and capable of changing the fluid discharge direction toward a working attachment rotatably supported at the tip; A fluid discharge unit comprising:

2. In claim 1, a swivel joint structure including a rotating body that communicates with and supports the discharge nozzle and a fixed body that rotatably supports the rotating body; a first electric linear motion mechanism that includes a first support portion and a first movable portion that is supported by the first support portion so as to be linearly movable; and a first rotation mechanism that converts the linear movement of the first movable portion into rotational movement and rotationally displaces the rotating body. A fluid discharge unit comprising:

3. In claim 2, The rotating body is provided with a first lever portion, The first rotation mechanism includes a first connecting portion that connects the first movable portion and the first lever portion. A fluid discharge unit comprising:

4. In claim 1, further comprising: An on-off valve is provided to control the amount of fluid discharged. A fluid discharge unit comprising:

5. In claim 4, further comprising: a second electric linear motion mechanism including a second support portion and a second movable portion supported on the second support portion so as to be linearly movable; and a second rotation mechanism that converts the linear movement of the second movable portion into rotational movement and opens and closes the on-off valve. A fluid discharge unit comprising:

6. In claim 5, a second lever portion is provided on the opening / closing shaft of the opening / closing valve; The second rotation mechanism includes a second connecting portion that connects the second movable portion and the second lever portion. A fluid discharge unit comprising:

7. In claim 1, further comprising: a sensor capable of detecting the direction of the work attachment; The direction of the discharge nozzle is controlled according to the output signal of the sensor. A fluid discharge unit comprising:

8. In claim 1, The fluid discharge unit is characterized in that the fluid is water.

9. In claim 1, The fluid discharge unit is attached to the side of the arm body facing the work machine. A fluid discharge unit comprising:

10. A work machine having an arm body that rotatably supports a work attachment, a fluid discharge unit disposed in front of the tip of the arm body and having a discharge nozzle capable of changing the direction of fluid discharge toward the working attachment; A work machine characterized by:

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