Water jet device

Abstract

To provide a water jet device that can suppress the collision of sprayed water with an object when water remaining in the flow path is sprayed. [Solution] The water jet device 10 includes a nozzle 112 that sprays pressurized water to form a water jet. The water jet device 10 includes a block body 182 and position change units 130, 150, 160, 170, 181, and 190. The block body 182 blocks the sprayed water when it is located at a passage position through which the sprayed water passes, and allows the sprayed water to pass when it is located at a non-pass position different from the passage position. The position change units change the position of the block body 182 between the passage position and the non-pass position.

Description

Technical Field

[0001] The present invention relates to a water jet device.

Background Art

[0002] A water jet device including a nozzle that injects water pressurized to form a water jet is known. For example, the water jet device described in Patent Document 1 includes a pump that generates pressurized water, a flow path that supplies the pressurized water from the pump to the nozzle, and a switching valve disposed in the flow path. The switching valve switches between a supply execution state in which the pressurized water is supplied to the nozzle and a supply stop state in which the supply of the pressurized water to the nozzle is stopped.

[0003] According to this, by the injected water colliding with an object (for example, a rock mass, concrete, etc.), a part of the object can be removed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in the above water jet device, the flow path between the switching valve and the nozzle, which is a part of the flow path, is relatively long. Therefore, even when the switching valve is switched to the supply stop state, due to the pressure of the water remaining in the flow path between the switching valve and the nozzle, the remaining water is injected until a relatively long time has elapsed since the switching valve was switched to the supply stop state, and the injected water collides with the object.

[0006] As a result, there was a risk of excessive removal of the target object, a risk of injury to the user from flying debris resulting from such removal, or a risk of the user holding the water jet device falling over due to the reaction force generated by the spraying of residual water.

[0007] One of the objectives of the present invention is to suppress the collision of water with an object when water remaining in the flow path is ejected. [Means for solving the problem]

[0008] In one aspect of the present invention, the water jet device comprises a nozzle that ejects pressurized water to form a water jet. The water jet device comprises a block body and a position change unit. The block body blocks the sprayed water when it is located in a passage position through which the sprayed water passes, and allows the sprayed water to pass through when it is located in a non-passage position different from the passage position. The position-changing section changes the position of the block body between a passing position and a non-passing position. [Effects of the Invention]

[0009] This method can suppress the collision of water with an object when water remaining in the flow path is ejected. [Brief explanation of the drawing]

[0010] [Figure 1] This is a diagram showing the configuration of the water jet system according to the first embodiment. [Figure 2] This is a perspective view of a part of the main body of the water jet device according to the first embodiment. [Figure 3] This is a perspective view of a part of the main body of the water jet device according to the first embodiment. [Figure 4] This is a front view of a part of the main body of the water jet device according to the first embodiment. [Figure 5]It is a side view of a part of the main body of the water jet device according to the first embodiment. [Figure 6] It is a cross-sectional view of a part of the main body of the water jet device according to the first embodiment. [Figure 7] It is a cross-sectional view of a part of the main body of the water jet device according to the first embodiment. [Figure 8] It is a plan view of a part of the main body of the water jet device according to the first embodiment. [Figure 9] It is a cross-sectional view of a part of the main body of the water jet device according to the first embodiment. [Figure 10] It is an exploded perspective view of a part of the main body of the water jet device according to the first embodiment. [Figure 11] It is an exploded perspective view of a part of the main body of the water jet device according to the first embodiment. [Figure 12] It is a cross-sectional view of a part of the main body of the water jet device according to the first embodiment. [Figure 13] It is an enlarged cross-sectional view of a part of the main body of the water jet device according to the first embodiment. [Figure 14] It is an enlarged cross-sectional view of a part of the main body of the water jet device according to the first embodiment. [Figure 15] It is an enlarged cross-sectional view of a part of the main body of the water jet device according to the first embodiment.

Modes for Carrying Out the Invention

[0011] Hereinafter, each embodiment of the water jet device of the present invention will be described with reference to FIGS. 1 to 15.

[0012] <First Embodiment> (Overview) The water jet device according to the first embodiment includes a nozzle that injects water pressurized to form a water jet. The water jet device includes a block body and a position changing part. The block body blocks the water sprayed when it is located at the passage position through which the sprayed water passes, and allows the water sprayed when it is located at a non-passage position different from the passage position to pass through. The position changing unit changes the position of the block body between the passage position and the non-passage position.

[0013] According to this, by positioning the block body at the passage position, the water sprayed can be blocked. Thereby, for example, even when pressurized water remains in the flow path for supplying the pressurized water to the nozzle, it is possible to suppress the remaining water from colliding with the object. As a result, for example, it is possible to suppress excessive removal of the object, injury of the user by the flying objects generated by the removal, or the fall of the user holding the water jet device due to the reaction force generated by the injection of the remaining water. Next, the water jet device of the first embodiment will be described in more detail.

[0014] (Configuration) Hereinafter, as shown in FIGS. 1 to 12, a water jet system 1 including a water jet device 10 of the first embodiment will be described using a right-handed orthogonal coordinate system having an x-axis, a y-axis, and a z-axis.

[0015] In this example, the x-axis direction, the y-axis direction, and the z-axis direction may be respectively represented as the left-right direction, the front-back direction, and the up-down direction of the water jet device 10. Also, in this example, the positive direction of the x-axis, the negative direction of the x-axis, the positive direction of the y-axis, the negative direction of the y-axis, the positive direction of the z-axis, and the negative direction of the z-axis may be respectively represented as the right direction, the left direction, the front direction, the rear direction, the up direction, and the down direction of the water jet device 10.

[0016] In this example, the positive and negative directions of the z-axis coincide with the vertically upward and vertically downward directions, respectively. Note that the z-axis direction may differ from the vertical direction depending on the operating conditions of the water jet device 10.

[0017] As shown in Figure 1, the water jet system 1 comprises a water jet device 10, a water supply device 21, a water control valve 22, an air supply device 31, and an air control valve 32.

[0018] The water jet device 10 sprays pressurized water (in other words, high-pressure water) to form a water jet, causing the sprayed high-pressure water to collide with the target object. As a result, the water jet device 10 scrapes off (in other words, removes) a portion of the target object. For example, the target object may be rock, concrete, steel plate, or a coating on concrete or steel plate (e.g., paint).

[0019] In this example, the water jet device 10 is configured to be portable by the user. In this example, the water jet device 10 is gun-type or rifle-type. The water jet device 10 may also be rod-shaped. Furthermore, the water jet device 10 may be self-propelled or mounted on a robot (e.g., an arm-type robot).

[0020] The water jet device 10 comprises a main body 11, a grip 12, and a control unit 13. The main body 11 is rod-shaped and extends in the y-axis direction. High-pressure water is supplied to the end of the main body 11 in the negative direction of the y-axis. The main body 11 ejects the supplied high-pressure water from the end in the positive direction of the y-axis. The grip portion 12 extends from the end of the main body portion 11 in the negative direction of the y-axis toward the negative direction of the z-axis. The grip portion 12 is held by the user.

[0021] The water supply device 21 supplies high-pressure water to the water jet device 10. In this example, the water supply device 21 includes a pump that delivers high-pressure water. The water supply device 21 and the water jet device 10 are connected by a pipe (for example, a hose or pipe) that constitutes a flow path. As described later, the high-pressure water supplied from the water supply device 21 to the water jet device 10 is supplied to the nozzle 112 and ejected from the nozzle 112.

[0022] The water control valve 22 is installed in the flow path between the water supply device 21 and the water jet device 10. The water control valve 22 switches between a supply operation state, which supplies high-pressure water to the water jet device 10, and a supply stop state, which stops the supply of high-pressure water to the water jet device 10. In this example, the water control valve 22 switches its state depending on whether or not pressurized air (in other words, high-pressure air) is supplied from the air supply device 31 via the air control valve 32.

[0023] The water control valve 22 maintains a supply-active state while operating air is being supplied to it, and maintains a supply-stopped state while operating air is not being supplied to it. In other words, the water control valve 22 switches from a supply-stopped state to a supply-active state when the supply of operating air to it begins, and switches from a supply-active state to a supply-stopped state when the supply of operating air to it ends.

[0024] The air supply device 31 supplies pressurized air (in other words, high-pressure air), which is pilot air, to the air control valve 32 and to the connection port 170c of the water jet device 10, which will be described later, and also supplies working air to the water control valve 22. In this example, the air supply device 31 includes a compressor that delivers high-pressure air by compressing air.

[0025] In this example, the pilot air and the working air have equal pressures. However, the pilot air and the working air may have different pressures. In this case, the pressure of the pilot air may be lower than the pressure of the working air.

[0026] The air supply device 31 and the air control valve 32 and the connection port section 170c are connected by pipes that constitute a flow path. Similarly, the air supply device 31 and the water control valve 22 are also connected by pipes that constitute a flow path.

[0027] The air control valve 32 is located in the flow path between the air supply device 31 and the water control valve 22. The air control valve 32 switches between a supply execution state, which supplies working air to the water control valve 22, and a supply stop state, which stops the supply of working air to the water control valve 22. In this example, the air control valve 32 switches its state depending on whether or not pilot air is supplied from the air supply device 31 via the control unit 13 of the water jet device 10.

[0028] The air control valve 32 maintains a supply-active state when pilot air is supplied to it, and maintains a supply-stopped state when pilot air is not supplied to it. In other words, when the supply of pilot air to the air control valve 32 begins, the state of the air control valve 32 switches from a supply-stopped state to a supply-active state, and when the supply of pilot air to the air control valve 32 ends, the state switches from a supply-active state to a supply-stopped state.

[0029] The control unit 13 comprises a button-type switch 13a and a lever 13b. The control unit 13 is activated when the user operates the lever 13b, causing the button-type switch 13a to be pressed. In this example, the control unit 13 is activated when the user grips the lever 13b and the main body 11 between them and pushes the lever 13b downwards in the negative z-axis direction so that the lever 13b approaches the main body 11, thereby pressing the button-type switch 13a. When the button-type switch 13a is pressed, it is biased to return to its unpressed position.

[0030] The control unit 13 is located in the flow path between the air supply device 31 and the air control valve 32 and connection port 170c. The control unit 13 switches between a supply execution state, which supplies pilot air to the air control valve 32 and connection port 170c, and a supply stop state, which stops the supply of pilot air to the air control valve 32 and connection port 170c. In this example, the control unit 13 switches its state depending on whether the button-type switch 13a is pressed or not.

[0031] The control unit 13 maintains a supply execution state while the button switch 13a is pressed, and maintains a supply stop state while the button switch 13a is not pressed. In other words, when the button switch 13a is pressed, the control unit 13 switches from a supply stop state to a supply execution state, and when the button switch 13a is stopped, the control unit 13 switches from a supply execution state to a supply stop state.

[0032] With this configuration, the control unit 13 switches the state of the water jet device 10 between a supply execution state in which high-pressure water is supplied to the nozzle 112 and a supply stop state in which the supply of high-pressure water to the nozzle 112 is stopped. In this example, the control unit 13 corresponds to the supply state switching unit.

[0033] The main body 11 will be described below with reference to Figures 2 through 12. In Figures 2 to 12, only the portion of the main body 11 in the positive direction of the y-axis, rather than the central portion in the y-axis direction, is shown, while the other parts are omitted. Figure 2 is a view of the main body 11 from a position that is to the right of the main body 11, in front of the main body 11, and above the main body 11 (in other words, a right-front-upward perspective view). Figure 3 is a view of the main body 11 from a position that is to the right of the main body 11, behind the main body 11, and below the main body 11 (in other words, a right rear-downward perspective view). Figure 4 is a view of the main body 11 from the front (in other words, a front view).

[0034] Figure 5 is a view of the main body 11 from the left (in other words, a left side view). Figure 6 is a view of the cross-section of the main body 11, cut by the plane represented by the line VI-VI in Figure 5, as seen in the positive z-axis direction. Figure 7 shows a cross-section of the main body 11, cut by the plane represented by the line VII-VII in Figure 5, viewed in the negative direction of the y-axis.

[0035] Figure 8 is a view of the main body 11 from above (in other words, a plan view). Figure 9 shows a cross-section of the main body 11, cut by the plane represented by the line IX-IX in Figure 8, when the block body is positioned in the passing position, viewed in the negative x-axis direction. Figure 10 is a perspective view of the main body 11 from the upper right front in its disassembled state. Figure 11 is a perspective view of the main body 11 in its disassembled state, showing the right rear and lower part of the body.

[0036] Figure 12 shows a cross-section of the main body 11, cut by the plane represented by the line IX-IX in Figure 8, when the block body is located in a non-passing position, viewed in the negative x-axis direction.

[0037] As shown in Figures 10 and 11, the main body 11 comprises a water flow channel section 110, a cylindrical cover 120, a cylinder block 130, a position adjustment nut 140, a coil spring 150, a reciprocating body 160, a cylinder head 170, a shut-off section 180, and a nozzle cover 190.

[0038] As shown in Figures 6, 9 to 11, and 12, the water flow channel section 110 comprises a cylindrical body 111 and a nozzle 112. The cylindrical body 111 is a hollow cylinder with a central axis extending along the injection direction line. In this example, the injection direction line is a straight line extending in the direction from which water is injected. In this example, the injection direction line extends in the y-axis direction. In this example, the direction from which water is injected is the positive y-axis direction.

[0039] In this example, the cylindrical body 111 is cylindrical in shape. In other words, the cylindrical body 111 has an inner wall surface 111a that penetrates the cylindrical body 111 in the y-axis direction and forms an internal space that constitutes a flow path with a circular cross-section. The inner wall surface 111a has a nozzle receiving portion 111a1 at its end in the positive direction of the y-axis that forms an internal space with a larger diameter than other portions. Furthermore, the cross-section of the outer wall of the cylindrical body 111 may be a shape other than a circle (for example, an elliptical shape or a polygonal shape).

[0040] A pipe is connected to the end of the cylindrical body 111 in the negative y-axis direction (not shown), which constitutes a flow path for high-pressure water supplied by the water supply device 21. As a result, high-pressure water supplied by the water supply device 21 is supplied to the internal space of the cylindrical body 111 from the end of that internal space in the negative y-axis direction.

[0041] The nozzle 112 is a hollow cylindrical shape with its central axis extending along the straight line of the injection direction. In other words, the nozzle 112 has an inner wall surface 112a that penetrates the nozzle 112 in the injection direction of the nozzle 112 (in this example, the positive direction of the y-axis) and forms an internal space that constitutes a flow path with a circular cross-section.

[0042] The internal space of the nozzle 112 communicates with the internal space of the cylindrical body 111 at its end in the upstream direction of the injection direction (in this example, the negative direction of the y-axis). The diameter of the cross-section of the end of the internal space of the nozzle 112 in the upstream direction of the injection direction is equal to the diameter of the cross-section of the internal space of the cylindrical body 111 excluding the nozzle receiving portion 111a1. With this configuration, the internal space of the cylindrical body 111 constitutes a flow path that supplies high-pressure water from its end in the negative direction of the y-axis to the nozzle 112.

[0043] The internal space of the nozzle 112 gradually decreases in cross-sectional area as it moves downstream in the injection direction, resulting in a constricted portion at the downstream end of the internal space. The diameter of the cross-section at the downstream end of the internal space of the nozzle 112 is smaller than the diameter of the cross-section at the upstream end of the internal space, and larger than the diameter of the constricted portion.

[0044] The nozzle 112 is removably fixed to the cylindrical body 111 by housing a portion of the nozzle 112 in the internal space formed by the nozzle receiving portion 111a1. In this example, the nozzle 112 is fixed to the cylindrical body 111 by screwing, as the nozzle receiving portion 111a1 has a female screw and the outer wall of the nozzle 112 has a male screw.

[0045] The cylindrical cover 120 is a hollow cylinder with a central axis extending along the straight line of the injection direction. In this example, the cylindrical cover 120 is cylindrical. In other words, the cylindrical cover 120 has an internal space that penetrates the cylindrical cover 120 in the y-axis direction and has a circular cross-section.

[0046] The inner diameter of the cylindrical cover 120 is larger than the outer diameter of the water channel section 110. The cylindrical cover 120 is coaxial with the water channel section 110. In this example, the end of the cylindrical cover 120 in the negative y-axis direction (not shown) is supported so that its position relative to the water channel section 110 does not change.

[0047] The cylindrical cover 120 accommodates the portion of the water flow channel 110 from the end in the negative direction of the y-axis to the central part within the internal space of the cylindrical cover 120. Furthermore, the cross-section of the outer wall of the cylindrical cover 120 may be a shape other than a circle (for example, an elliptical shape or a polygonal shape). The end of the inner wall of the cylindrical cover 120 in the positive direction of the y-axis has a female screw.

[0048] The cylinder block 130 is a hollow cylindrical shape with its central axis extending along the straight line of the injection direction. The cylinder block 130 is located coaxially with the water flow path section 110. The cylinder block 130 has a first outer wall portion 130a, a second outer wall portion 130b, a third outer wall portion 130c, a first inner wall portion 130d, and a second inner wall portion 130e.

[0049] The first outer wall portion 130a is the part of the outer wall of the cylinder block 130 that is located furthest in the negative direction of the y-axis. The cross-section of the first outer wall portion 130a is circular. The diameter of the cross-section of the first outer wall portion 130a (in other words, the outer diameter) is slightly smaller than the inner diameter of the cylindrical cover 120. The first outer wall portion 130a has a male screw.

[0050] The cylinder block 130 is fixed to the cylindrical cover 120 such that its end in the negative direction of the y-axis is housed in the end of the cylindrical cover 120 in the positive direction of the y-axis within the internal space of the cylindrical cover 120. In this example, the cylinder block 130 is fixed to the cylindrical cover 120 by screwing together the male threads on the first outer wall portion 130a with the female threads on the inner wall of the cylindrical cover 120.

[0051] The second outer wall portion 130b is the portion of the cylinder block 130's outer wall located between the first outer wall portion 130a and the third outer wall portion 130c. The cross-section of the second outer wall portion 130b is a regular hexagon. The diameter of the circle circumscribing the cross-section of the second outer wall portion 130b is larger than the diameter of the cross-section of the first outer wall portion 130a.

[0052] The third outer wall portion 130c is the part of the cylinder block 130's outer wall that is located furthest in the positive direction of the y-axis. The cross-section of the third outer wall portion 130c is circular. The diameter (in other words, the outer diameter) of the cross-section of the third outer wall portion 130c is larger than the diameter of the cross-section of the first outer wall portion 130a.

[0053] The first inner wall portion 130d is the part of the inner wall of the cylinder block 130 located in the negative direction of the y-axis. The cross-section of the first inner wall portion 130d is circular. The diameter (in other words, the inner diameter) of the cross-section of the first inner wall portion 130d is slightly larger than the outer diameter of the cylindrical body 111.

[0054] The second inner wall portion 130e is the portion of the inner wall of the cylinder block 130 located in the positive direction of the y-axis. The cross-section of the second inner wall portion 130e is circular. The diameter of the cross-section of the second inner wall portion 130e (in other words, the inner diameter) is larger than the diameter of the cross-section of the first inner wall portion 130d (in other words, the inner diameter). The second inner wall portion 130e has a female screw at its end in the positive direction of the y-axis.

[0055] The position adjustment nut 140 is a hollow cylindrical shape with its central axis extending along the straight line of the injection direction. The position adjustment nut 140 is located coaxially with the water flow path section 110. The cross-section of the outer wall of the position adjustment nut 140 is a regular hexagon. The diameter of the circle circumscribing the cross-section of the outer wall of the position adjustment nut 140 is larger than the inner diameter of the cylindrical cover 120.

[0056] The inner wall cross-section of the position adjustment nut 140 is circular. The diameter of the inner wall cross-section of the position adjustment nut 140 (in other words, the inner diameter) is slightly larger than the diameter of the cross-section of the first outer wall portion 130a of the cylinder block 130 (in other words, the outer diameter). The inner wall of the position adjustment nut 140 has a female thread.

[0057] The position adjustment nut 140 is fixed to the cylinder block 130 such that the portion of the cylinder block 130 where the first outer wall portion 130a is located passes through the internal space of the position adjustment nut 140 and penetrates the position adjustment nut 140. In this example, the position adjustment nut 140 is fixed to the cylinder block 130 by screwing together the male thread on the first outer wall portion 130a of the cylinder block 130 and the female thread on the inner wall of the position adjustment nut 140.

[0058] The position adjustment nut 140 allows adjustment in the y-axis direction of the position at which it is fixed to the cylinder block 130. In this example, by adjusting the position at which the position adjustment nut 140 is fixed to the cylinder block 130, the position at which the cylinder block 130 is fixed to the cylindrical cover 120 is adjusted.

[0059] The reciprocating body 160 is a hollow cylindrical shape with its central axis extending along the straight line of the injection direction. The reciprocating body 160 is located coaxially with the water flow channel section 110. The reciprocating body 160 has a first outer wall portion 160a, a second outer wall portion 160b, an inner wall portion 160c, and a connecting body receiving portion 160d.

[0060] The first outer wall portion 160a is the part of the outer wall of the reciprocating body 160 located in the negative direction of the y-axis. The cross-section of the first outer wall portion 160a is circular. The diameter of the cross-section of the first outer wall portion 160a (in other words, the outer diameter) is smaller than the diameter of the cross-section of the second inner wall portion 130e of the cylinder block 130 (in other words, the inner diameter), and larger than the diameter of the cross-section of the first inner wall portion 130d of the cylinder block 130 (in other words, the inner diameter).

[0061] The second outer wall portion 160b is the part of the outer wall of the reciprocating body 160 located in the positive direction of the y-axis. The cross-section of the second outer wall portion 160b is circular. The diameter (in other words, the outer diameter) of the cross-section of the second outer wall portion 160b is larger than the diameter (in other words, the outer diameter) of the cross-section of the first outer wall portion 160a, and slightly smaller than the diameter (in other words, the inner diameter) of the cross-section of the second inner wall portion 130e of the cylinder block 130.

[0062] The inner wall portion 160c is the inner wall of the reciprocating body 160. The cross-section of the inner wall portion 160c is circular. The diameter of the cross-section of the inner wall portion 160c (in other words, the inner diameter) is slightly larger than the outer diameter of the cylindrical body 111. The reciprocating body 160 is formed when the cylindrical body 111 passes through the internal space, causing the cylindrical body 111 to penetrate the reciprocating body 160.

[0063] The reciprocating body 160 has an inner wall portion 160c that is slidable against the cylindrical body 111, and a second outer wall portion 160b that is slidable against the second inner wall portion 130e of the cylinder block 130. With this configuration, the reciprocating body 160 can reciprocate in the reciprocating direction. In this example, the reciprocating direction coincides with the y-axis direction.

[0064] The connecting support portion 160d forms a bottomed hole that opens at the end face of the reciprocating body 160 in the positive direction of the y-axis. The hole formed by the connecting support portion 160d is cylindrical in shape, with its central axis extending in the y-axis direction. In this example, the connecting support portion 160d is located in the negative direction of the z-axis with respect to the central axis of the reciprocating body 160.

[0065] The cylinder head 170 is a hollow cylindrical shape with its central axis extending along the straight line of the injection direction. The cylinder head 170 is located coaxially with the water flow path section 110. The cylinder head 170 has a first outer wall portion 170a, a second outer wall portion 170b, a connection port portion 170c, a third outer wall portion 170d, an inner wall portion 170e, an air passage portion 170f, and a connecting body through hole portion 170g.

[0066] The first outer wall portion 170a is the part of the outer wall of the cylinder head 170 that is located furthest in the negative direction of the y-axis. The cross-section of the first outer wall portion 170a is circular. The diameter of the cross-section of the first outer wall portion 170a (in other words, the outer diameter) is slightly smaller than the diameter of the cross-section of the second inner wall portion 130e of the cylinder block 130 (in other words, the inner diameter). The first outer wall portion 170a has a male screw.

[0067] The cylinder head 170 is fixed to the cylinder block 130 such that its end in the negative direction of the y-axis is housed in the end of the internal space of the cylinder block 130 in the positive direction of the y-axis. In this example, the cylinder head 170 is fixed to the cylinder block 130 by screwing together the male threads on the first outer wall portion 170a and the female threads on the second inner wall portion 130e of the cylinder block 130.

[0068] The second outer wall portion 170b is the portion of the cylinder head 170's outer wall located between the first outer wall portion 170a and the third outer wall portion 170d. The cross-section of the second outer wall portion 170b is circular. The diameter (in other words, the outer diameter) of the cross-section of the second outer wall portion 170b is larger than the diameter of the cross-section of the first outer wall portion 170a.

[0069] The connection port portion 170c protrudes from the second outer wall portion 170b. In this example, the connection port portion 170c protrudes from the second outer wall portion 170b in the positive x-axis direction. As shown in Figure 6, the connection port portion 170c has a pipe connection hole portion 170c1. The pipe connection hole portion 170c1 forms a hole to which a pipe constituting a flow path through which pilot air supplied by the air supply device 31 flows is connected.

[0070] The third outer wall portion 170d is the part of the cylinder head 170's outer wall that is located furthest in the positive direction of the y-axis. The cross-section of the third outer wall portion 170d is circular. The diameter (in other words, the outer diameter) of the cross-section of the third outer wall portion 170d is approximately equal to the diameter of the cross-section of the first outer wall portion 170a. The third outer wall portion 170d has a male screw.

[0071] The inner wall portion 170e is the inner wall of the cylinder head 170. The cross-section of the inner wall portion 170e is circular. The diameter of the cross-section of the inner wall portion 170e (in other words, the inner diameter) is slightly larger than the outer diameter of the cylindrical body 111.

[0072] The air passage section 170f opens at the end face of the cylinder head 170 in the negative y-axis direction and forms a passage that communicates with the hole formed by the pipe connection hole section 170c1. In this example, the passage formed by the air passage section 170f opens at two positions on the end face of the cylinder head 170 in the negative y-axis direction: one position in the positive x-axis direction with respect to the central axis of the cylinder head 170, and another position in the negative x-axis direction with respect to the central axis of the cylinder head 170.

[0073] The connecting body through-hole portion 170g forms a hole that penetrates the cylinder head 170 in the y-axis direction. The hole formed by the connecting body through-hole portion 170g is cylindrical in shape, with its central axis extending in the y-axis direction. The hole formed by the connecting body through-hole portion 170g has the same diameter as the hole formed by the connecting body receiving portion 160d and is coaxial with that hole.

[0074] In this example, the space formed by the second inner wall portion 130e of the cylinder block 130, the outer wall of the cylindrical body 111, the end face of the reciprocating body 160 in the positive direction of the y-axis, and the end face of the cylinder head 170 in the negative direction of the y-axis corresponds to the operating chamber. Therefore, in this example, the operating chamber is formed on the outer circumference of the cylindrical body 111.

[0075] In this example, the space between the second outer wall portion 160b of the reciprocating body 160 and the second inner wall portion 130e of the cylinder block 130 is airtightly sealed with a sealing material. For example, the sealing material is an annular packing with a Y-shaped, V-shaped, or O-shaped cross-section. Similarly, the space between the inner wall portion 160c of the reciprocating body 160 and the outer wall of the cylindrical body 111 is also airtightly sealed with a sealing material. Likewise, the space between the portion of the inner wall portion 170e of the cylinder head 170 that is in the positive direction of the y-axis more than the air passage portion 170f and the outer wall of the cylindrical body 111 is also airtightly sealed with a sealing material.

[0076] With this configuration, the working chamber is airtight and can be supplied with pressurized air. Furthermore, with this configuration, the reciprocating body 160 forms the wall of the working chamber and can reciprocate in the y-axis direction to change the volume of the working chamber.

[0077] In this example, as shown in Figures 6 and 9, the position of the reciprocating body 160 where the end face in the positive y-axis direction of the reciprocating body 160 abuts against the end face in the negative y-axis direction of the cylinder head 170 corresponds to the minimum volume position that minimizes the volume of the operating chamber.

[0078] In this example, as shown in Figure 12, the position of the reciprocating body 160 where the end face in the negative direction of the y-axis contacts the cylinder bottom surface corresponds to the maximum volume position that maximizes the volume of the operating chamber. In this example, the cylinder bottom surface constitutes the boundary between the first inner wall portion 130d and the second inner wall portion 130e of the cylinder block 130, and is an annular surface perpendicular to the y-axis direction. In other words, the reciprocating body 160 is capable of reciprocating in the reciprocating direction between the position of maximum volume and the position of minimum volume.

[0079] The coil spring 150 has a central axis that extends along the straight line of the injection direction and also extends along the cylindrical surface surrounding the cylindrical body 111. In this example, the coil spring 150 has a central axis that extends along the straight line of the injection direction and also extends along the cylindrical surface surrounding the first outer wall portion 160a of the reciprocating body 160.

[0080] The end of the coil spring 150 in the negative direction of the y-axis abuts against the bottom surface of the cylinder. The end of the coil spring 150 in the positive direction of the y-axis abuts against the reciprocating body step surface. The reciprocating body step surface constitutes the boundary between the first outer wall portion 160a and the second outer wall portion 160b of the reciprocating body 160, and is an annular surface perpendicular to the y-axis direction. With this configuration, the coil spring 150 biases the reciprocating body 160 in the direction that reduces the volume of the operating chamber (in this example, the positive direction of the y-axis) within the reciprocating motion.

[0081] In this example, the coil spring 150 biases the reciprocating body 160 such that it is located at the minimum volume position when pilot air is not supplied to the operating chamber, and at the maximum volume position when pilot air is supplied to the operating chamber. In this example, the coil spring 150 corresponds to the biasing part.

[0082] The nozzle cover 190 is a hollow cylindrical shape with its central axis extending along the straight line of the injection direction. The nozzle cover 190 has a bottom at the end in the positive direction of the y-axis. The nozzle cover 190 is located coaxially with the water flow channel section 110. The nozzle cover 190 has a first outer wall portion 190a, a second outer wall portion 190b, a first inner wall portion 190c, a second inner wall portion 190d, and a third inner wall portion 190e.

[0083] The first outer wall portion 190a is the part of the outer wall of the nozzle cover 190 located in the negative direction of the y-axis. The cross-section of the first outer wall portion 190a is circular. The diameter (in other words, the outer diameter) of the cross-section of the first outer wall portion 190a is approximately equal to the diameter (in other words, the outer diameter) of the cross-section of the third outer wall portion 130c of the cylinder block 130.

[0084] The first outer wall portion 190a has a recess 190a1 and a plurality (12 in this example) of discharge holes 190a2. The recess 190a1 forms an annular groove extending along a plane perpendicular to the straight line of the injection direction. The recess 190a1 is located in the region where the second inner wall portion 190d extends in the y-axis direction.

[0085] The discharge hole portion 190a2 opens at the bottom of the groove formed by the recess 190a1, thereby forming a discharge hole that connects the internal space of the nozzle cover 190 with the outside of the nozzle cover 190. The discharge hole formed by the discharge hole portion 190a2 extends radially from a straight line of the injection direction. Multiple discharge hole portions 190a2 are positioned at equal intervals in the circumferential direction from a straight line of the injection direction.

[0086] With this configuration, the multiple discharge holes formed by the multiple discharge holes 190a2 discharge the water that is blocked by the shut-off section 180 when the water sprayed from the nozzle 112 is blocked to the outside of the main body 11. In this example, the multiple discharge holes discharge water radially, centered on the straight line of the spray direction.

[0087] The nozzle cover 190 includes a diffuser 191. The diffuser 191 is annular. The diffuser 191 is loosely fitted into the first outer wall portion 190a so as to be housed in the recess 190a1. For example, the diffuser 191 is an annular packing with an O-shaped cross-section. With this configuration, the diffuser 191 diffuses the water by having at least a portion of the water discharged from the multiple discharge holes, each formed by the multiple discharge holes 190a2, collide with the diffuser 191.

[0088] The second outer wall portion 190b is the part of the nozzle cover 190's outer wall located in the positive direction of the y-axis. The cross-section of the second outer wall portion 190b is circular. At the end of the second outer wall portion 190b in the negative direction of the y-axis, the diameter of the cross-section of the second outer wall portion 190b (in other words, the outer diameter) is equal to the diameter of the cross-section of the first outer wall portion 190a.

[0089] The diameter (in other words, the outer diameter) of the cross-section of the second outer wall section 190b decreases as it moves toward the positive direction of the y-axis. In other words, the second outer wall section 190b is frustoconical.

[0090] The second outer wall portion 190b has an injection hole portion 190b1. The injection hole portion 190b1 opens at the end face of the second outer wall portion 190b in the positive direction of the y-axis, forming an injection hole that connects the internal space of the nozzle cover 190 with the outside of the nozzle cover 190. The injection hole formed by the injection hole portion 190b1 is cylindrical in shape with its central axis extending along the straight line of the injection direction, and is located coaxially with the cylindrical body 111 (in other words, the nozzle 112).

[0091] With this configuration, the injection holes formed by the injection hole portion 190b1 allow the high-pressure water injected from the nozzle 112 to pass through.

[0092] The first inner wall portion 190c is the part of the inner wall of the nozzle cover 190 that is located furthest in the negative direction of the y-axis. The cross-section of the first inner wall portion 190c is circular. The diameter of the cross-section of the first inner wall portion 190c (in other words, the inner diameter) is slightly larger than the diameter of the third outer wall portion 170d of the cylinder head 170 (in other words, the outer diameter). The first inner wall portion 190c has a female screw.

[0093] The nozzle cover 190 is fixed to the cylinder head 170 such that the end of the cylinder head 170 in the positive direction of the y-axis is housed in the end of the nozzle cover 190 in the negative direction of the y-axis within the internal space of the nozzle cover 190. In this example, the nozzle cover 190 is fixed to the cylinder head 170 by screwing together the male threads on the third outer wall portion 170d of the cylinder head 170 and the female threads on the first inner wall portion 190c of the nozzle cover 190.

[0094] The second inner wall portion 190d is the portion of the inner wall of the nozzle cover 190 located between the first inner wall portion 190c and the third inner wall portion 190e. The cross-section of the second inner wall portion 190d is circular. The diameter of the cross-section of the second inner wall portion 190d (in other words, the inner diameter) is smaller than the diameter of the cross-section of the first inner wall portion 190c.

[0095] The third inner wall portion 190e is the portion of the inner wall of the nozzle cover 190 that is located furthest in the positive y-axis direction. The cross-section of the third inner wall portion 190e is circular. At the end of the third inner wall portion 190e in the negative y-axis direction, the diameter of the cross-section of the third inner wall portion 190e (in other words, the inner diameter) is equal to the diameter of the cross-section of the second inner wall portion 190d.

[0096] The diameter of the cross-section of the third inner wall portion 190e (in other words, the inner diameter) decreases as you move toward the positive direction of the y-axis. In other words, the third inner wall portion 190e is frustoconical. In this example, the space formed by the inner wall of the nozzle cover 190 and the end face of the cylinder head 170 in the positive direction of the y-axis corresponds to the housing space for the nozzle 112 and the block body 182 described later.

[0097] In other words, the nozzle cover 190 has a shape in which the wall surface of the third inner wall portion 190e, which forms the housing space, approaches the injection hole formed by the injection hole portion 190b1, and the wall surface of the third inner wall portion 190e approaches the injection hole, which is formed by the injection hole portion 190b1.

[0098] The blocking section 180 comprises a connecting body 181 and a block body 182. The connecting body 181 is rod-shaped with its central axis extending in the y-axis direction. In this example, the connecting body 181 is cylindrical. The connecting body 181 is fixed to the reciprocating body 160 such that its end in the negative y-axis direction is accommodated in a hole formed by the connecting body receiving portion 160d of the reciprocating body 160.

[0099] In this example, the connecting body 181 is fixed to the reciprocating body 160 using through holes and bolts (not shown). Alternatively, instead of using through holes and bolts, or in addition to through holes and bolts, the connecting body 181 may be fixed by screwing, with the connecting body 181 having a male screw and the connecting body receiving portion 160d having a female screw.

[0100] The connecting body 181 penetrates the cylinder head 170 by passing through the connecting body through hole 170g of the cylinder head 170. In this example, the diameter of the connecting body 181 is slightly smaller than the diameter of the connecting body through hole. With this configuration, the connecting body 181 is slidable relative to the connecting body through-hole 170g of the cylinder head 170. In this example, the space between the connecting body through-hole 170g of the cylinder head 170 and the connecting body 181 is airtightly sealed with a sealing material.

[0101] The block body 182 is rod-shaped and extends in the y-axis direction. In this example, the block body 182 has a rectangular cross-section. The block body 182 bends or curves as it moves toward the positive y-axis direction, approaching the straight line of the injection direction. In other words, the block body 182 is hook-shaped. For example, the block body 182 is L-shaped or J-shaped.

[0102] The end of the block body 182 in the negative y-axis direction is rotatably fixed to the end of the connecting body 181 in the positive y-axis direction. In this example, the central axis of rotation of the block body 182 extends in the x-axis direction.

[0103] With this configuration, the block body 182 slides against the wall surface of the third inner wall portion 190e of the nozzle cover 190 as the reciprocating body 160 moves back and forth. In this example, as shown in Figure 9, when the reciprocating body 160 is in the position of minimum volume, the block body 182 is positioned in a passage position through which the water sprayed from the nozzle 112 passes. As a result, the block body 182 blocks the water sprayed from the nozzle 112.

[0104] Furthermore, in this example, as shown in Figure 12, when the reciprocating body 160 is in the position of maximum volume, the block body 182 is in a non-passing position different from the passing position. As a result, the block body 182 allows the water sprayed from the nozzle 112 to pass through (in other words, it does not block the water sprayed from the nozzle 112).

[0105] In other words, the connecting body 181 connects the reciprocating body 160 and the block body 182 such that when the reciprocating body 160 is in the minimum volume position, the block body 182 is in a passing position, and when the reciprocating body 160 is in the maximum volume position, the block body 182 is in a non-passing position.

[0106] In this example, the cylinder block 130, coil spring 150, reciprocating body 160, cylinder head 170, connecting body 181, and nozzle cover 190 correspond to position changing parts that change the position of the block body 182 between a passing position and a non-passing position.

[0107] With this configuration, when the state of the control unit 13 is switched to a supply execution state in which pilot air is supplied to the air control valve 32 and the connection port 170c, the state of the water control valve 22 is switched to a supply execution state in which high-pressure water is supplied to the water jet device 10, and the position of the reciprocating body 160 is switched to the maximum volume position, thereby changing the position of the block body 182 to a non-pass position.

[0108] Furthermore, when the state of the control unit 13 is switched to a supply stop state, which stops the supply of pilot air to the air control valve 32 and the connection port 170c, the state of the water control valve 22 is switched to a supply stop state, which stops the supply of high-pressure water to the water jet device 10, and the position of the reciprocating body 160 is switched to the minimum volume position, thereby changing the position of the block body 182 to the passing position.

[0109] (operation) Next, the operation of the water jet system 1 of the first embodiment will be described. First, let's assume a state where the user is not operating the lever 13b of the control unit 13. In this case, since the button-type switch 13a of the control unit 13 is not pressed, the state of the control unit 13 is maintained in a supply stop state, which stops the supply of pilot air to the air control valve 32 and the connection port 170c.

[0110] In this case, the state of the water control valve 22 is maintained in a supply stop state, which stops the supply of high-pressure water to the water jet device 10. Furthermore, the position of the reciprocating body 160 is maintained at the minimum volume position by the force of the coil spring 150 biasing the reciprocating body 160. As a result, the position of the block body 182 is maintained at the passing position. In this state, the water jet device 10 does not spray high-pressure water from the nozzle 112.

[0111] Next, we consider the case where the user operates the lever 13b of the control unit 13, thereby pressing the button-type switch 13a. In this case, the state of the control unit 13 switches from a supply stop state, in which the supply of pilot air to the air control valve 32 and the connection port 170c is stopped, to a supply execution state, in which the supply of pilot air to the air control valve 32 and the connection port 170c is executed.

[0112] As a result, the state of the water control valve 22 switches from a supply stop state, which stops the supply of high-pressure water to the water jet device 10, to a supply execution state, which enables the supply of high-pressure water to the water jet device 10. Furthermore, pilot air is supplied to the pipe connection hole 170c1.

[0113] As shown in Figure 13, the pilot air AF supplied to the cylinder head 170 from the pipe connection hole 170c1 passes through the air passage 170f and reaches the end face of the reciprocating body 160 in the positive y-axis direction. As a result, the pressure of the pilot air moves the reciprocating body 160 in the negative y-axis direction. This causes the position of the reciprocating body 160 to switch from the minimum volume position to the maximum volume position, as shown in Figure 14. As a result, the position of the block body 182 changes from a passing position to a non-passing position.

[0114] In this state, the water jet device 10 sprays high-pressure water WF from the nozzle 112. The high-pressure water WF sprayed from the nozzle 112 passes through the injection holes formed by the injection holes 190b1 and collides with the target object. This state continues as long as the button-type switch 13a of the control unit 13 is kept pressed down.

[0115] Subsequently, we assume that the button-type switch 13a returns to its unpressed position when the user finishes operating the lever 13b of the control unit 13. In this case, the state of the control unit 13 switches from a supply execution state, in which it supplies pilot air to the air control valve 32 and the connection port 170c, to a supply stop state, in which it stops supplying pilot air to the air control valve 32 and the connection port 170c.

[0116] As a result, the state of the water control valve 22 switches from a supply execution state, which is used to supply high-pressure water to the water jet device 10, to a supply stop state, which is used to stop the supply of high-pressure water to the water jet device 10. Furthermore, as the supply of pilot air to the pipe connection hole 170c1 and the air passage section 170f is stopped, the force of the coil spring 150 biasing the reciprocating body 160 causes the reciprocating body 160 to move in the positive direction of the y-axis. As a result, as shown in Figure 15, the position of the reciprocating body 160 switches from the maximum volume position to the minimum volume position. Consequently, the position of the block body 182 changes from a non-passing position to a passing position.

[0117] At this time, the water jet device 10 injects water WF from the nozzle 112 due to the pressure of the water remaining in the flow path from the water control valve 22 to the nozzle 112. The injected water WF is blocked by the block body 182. The blocked water WF is discharged to the outside of the main body 11 through multiple discharge holes formed by the multiple discharge holes 190a2. Subsequently, the water jet device 10 stops spraying water from the nozzle 112 as the pressure of the water remaining in the flow path from the water control valve 22 to the nozzle 112 decreases.

[0118] As described above, the water jet device 10 of the first embodiment includes a nozzle 112 that sprays pressurized water to form a water jet. The water jet device 10 comprises a block body 182 and a position change section (in this example, a cylinder block 130, a coil spring 150, a reciprocating body 160, a cylinder head 170, a connecting body 181, and a nozzle cover 190). The block body 182 blocks the sprayed water when it is located in a passage position through which the sprayed water passes, and allows the sprayed water to pass through when it is located in a non-passage position different from the passage position. The position-changing unit changes the position of the block body 182 between a passing position and a non-passing position.

[0119] According to this, by positioning the block body 182 in a passing position, the sprayed water can be blocked. This makes it possible to suppress the impact of the remaining pressurized water on the target object, even if pressurized water remains in the flow path that supplies pressurized water to the nozzle 112. As a result, it is possible to suppress, for example, excessive removal of the target object, injury to the user from flying debris resulting from such removal, or the user holding the water jet device 10 falling over due to the reaction force generated by the spraying of remaining water.

[0120] Furthermore, the water jet device 10 of the first embodiment includes a supply state switching unit (in this example, a control unit 13). The supply state switching unit switches the state of the water jet device 10 between a supply execution state in which pressurized water is supplied to the nozzle 112 and a supply stop state in which the supply of pressurized water to the nozzle 112 is stopped. The position changing unit changes the position of the block body 182 to a non-passing position when the state of the water jet device 10 is switched to the supply execution state, and changes the position of the block body 182 to a passing position when the state of the water jet device 10 is switched to the supply stop state.

[0121] According to this, when the state of the water jet device 10 is switched to a supply stop state, the block body 182 can be positioned in a position where it passes through. This allows the water being sprayed by the block body 182 to be blocked by the pressure of the water remaining in the flow path supplying pressurized water to the nozzle 112. As a result, it is possible to suppress the sprayed water from colliding with the target object.

[0122] Furthermore, the water jet device 10 of the first embodiment includes a nozzle cover 190. The nozzle cover 190 forms a housing space for housing the nozzle 112 and the block body 182, and has an injection hole through which the sprayed water passes, and an outlet for discharging water that is blocked when the sprayed water is blocked by the block body 182.

[0123] According to this, damage to the nozzle 112 due to flying debris generated by the removal of the target object can be suppressed. Furthermore, the water blocked by the block body 182 is discharged from the discharge hole. This suppresses the scattering of water blocked by the block body 182.

[0124] Furthermore, in the water jet device 10 of the first embodiment, the nozzle cover 190 has a plurality of discharge holes configured such that water is discharged radially around the straight line of the jet direction, along a plane perpendicular to the straight line of the jet direction, which is a straight line extending in the direction in which water is jetted.

[0125] According to this, it is possible to suppress the discharge of water blocked by the block body 182 in a direction along the straight line of the injection direction. This makes it possible to suppress the component of the reaction force generated by the discharge of water blocked by the block body 182 that is in a direction along the straight line of the injection direction. Furthermore, the reaction forces generated by the discharge of water from multiple discharge holes can be canceled out from each other. This makes it possible to reduce the magnitude of the reaction force generated by the discharge of water blocked by the block body 182. As a result, it is possible to suppress the tipping of the user holding the water jet device 10 due to the reaction force generated by the discharge of water blocked by the block body 182.

[0126] Furthermore, the water jet device 10 of the first embodiment includes an annular diffuser 191 that diffuses the water by having at least a portion of the water discharged from a plurality of discharge holes collide with it.

[0127] This allows the water discharged from the outlet to be diffused. This reduces the impact force of the water discharged from the outlet.

[0128] Furthermore, in the water jet device 10 of the first embodiment, the position change section has an operating chamber that is airtightly sealed and to which pressurized air can be supplied, and includes a reciprocating body 160, a biasing section (a coil spring 150 in this example), and a connecting body 181. The reciprocating body 160 constitutes the wall of the working chamber and is capable of reciprocating in the reciprocating direction between a position that maximizes the volume of the working chamber and a position that minimizes the volume of the working chamber.

[0129] The biasing unit biases the reciprocating body 160 in the direction that reduces the volume of the operating chamber, within the reciprocating motion direction, such that the reciprocating body 160 is located at the minimum volume position when no pressurized air is supplied to the operating chamber, and at the maximum volume position when pressurized air is supplied to the operating chamber.

[0130] The connecting body 181 connects the reciprocating body 160 and the block body 182 such that when the reciprocating body 160 is in the minimum volume position, the block body 182 is positioned in a passing position, and when the reciprocating body 160 is in the maximum volume position, the block body 182 is positioned in a non-passing position.

[0131] According to this, when pressurized air is not supplied to the operating chamber, the reciprocating body 160 is biased by the biasing unit in a direction that reduces the volume of the operating chamber, thereby moving to the minimum volume position. As a result, the block body 182 is moved to the pass position. Consequently, the water sprayed from the nozzle is blocked by the block body 182.

[0132] On the other hand, when pressurized air is supplied to the operating chamber, the reciprocating body 160 moves in a direction that expands the volume of the operating chamber due to the pressure of the air supplied to the operating chamber, and is positioned at the maximum volume position. As a result, the block body 182 is positioned in a non-pass position. Consequently, the water ejected from the nozzle 112 collides with the target object without being blocked by the block body 182.

[0133] In this way, the sprayed water can only be made to impact the target object when pressurized air is supplied to the operating chamber. As a result, for example, excessive removal of the target object, injury to the user from flying debris resulting from such removal, or the user holding the water jet device 10 falling over due to the reaction force generated by the water jet can be suppressed.

[0134] Furthermore, the water jet device 10 of the first embodiment includes a cylindrical body 111. The cylindrical body 111 is cylindrical in shape and extends along the straight line of the injection direction, which is the straight line extending in the direction in which water is injected. A nozzle 112 is fixed to one end, and the internal space constitutes a flow path for supplying pressurized water from the other end to the nozzle 112.

[0135] The working chamber is formed on the outer circumference of the cylindrical body 111. The biasing section includes a coil spring 150 whose central axis extends along the straight line of the injection direction and along the cylindrical surface surrounding the cylindrical body 111. The reciprocating body 160 is cylindrical in shape and extends in a straight line along the injection direction, and the cylindrical body 111 passes through the internal space, so that the cylindrical body 111 penetrates the reciprocating body 160 and is slidable relative to the cylindrical body 111.

[0136] According to this design, an operating chamber is formed on the outer circumference of the cylindrical body 111. This allows the portion of the water jet device 10 near the nozzle 112 to be sufficiently narrow. As a result, the water jet device 10 can be positioned appropriately even when the space in which it can move is relatively narrow due to obstacles or other reasons. Consequently, the water ejected from the nozzle 112 can be made to collide with the target object at the desired position.

[0137] Furthermore, in the water jet device 10 of the first embodiment, the repositioning section forms a housing space for accommodating the nozzle 112 and the block body 182, and includes a nozzle cover 190 having an injection hole through which the sprayed water passes and an injection hole for discharging water that is blocked when the sprayed water is blocked by the block body 182.

[0138] The nozzle cover 190 has a shape in which the wall surface forming the housing space approaches the injection direction as it gets closer to the injection hole. The block body 182 is configured to slide against the wall surface of the nozzle cover 190 in conjunction with the reciprocating motion of the reciprocating body 160.

[0139] According to this, damage to the nozzle 112 due to flying debris generated by the removal of the target object can be suppressed. Furthermore, the water blocked by the block body 182 is discharged from the discharge hole. This suppresses the scattering of water blocked by the block body 182.

[0140] Furthermore, the block body 182 slides against the wall surface of the nozzle cover 190 that forms the housing space as the reciprocating body 160 moves back and forth. This allows the position of the block body 182 to be changed between a passing position and a non-passing position as the reciprocating body 160 moves back and forth.

[0141] It should be noted that the present invention is not limited to the embodiments described above. For example, various modifications can be made to the embodiments described above that are understandable to those skilled in the art, without departing from the spirit of the present invention.

[0142] For example, the water sprayed from the water jet device 10 may contain additives. For example, the additives may include at least one of the following: abrasives, thickeners, surfactants, rust inhibitors, corrosion inhibitors, dyes, pH adjusters, and defoamers. Furthermore, the water jet device 10 may be equipped with a plurality of nozzles 112. In this case, the nozzle head equipped with the plurality of nozzles 112 may be rotationally driven.

[0143] Furthermore, the shut-off section 180 may be equipped with a plurality of connecting bodies 181. In this case, the reciprocating body 160 has the same number of connecting body receiving portions 160d as the number of connecting bodies 181 equipped with the shut-off section 180, and the cylinder head 170 has connecting body through-hole portions 170g. According to this, if a connecting body 181 is damaged, it can be easily repaired by attaching a block body 182 to another connecting body 181. [Explanation of Symbols]

[0144] 1. Water jet system 10 Water jet device 11 Main body 12. Grip section 13 Control Unit 13a Button-type switch 13b Lever 21 Water supply equipment 22 Water control valve 31 Air supply device 32 Air control valve 110 Water channel section 111 Cylinder 111a Inner wall surface 111a1 Nozzle receiving part 112 nozzles 112a Inner wall surface 120 cylindrical cover 130 Cylinder Block 130a First exterior wall section 130b Second exterior wall section 130c 3rd outer wall 130d First inner wall section 130e Second inner wall section 140 Position adjustment nut 150 coil springs 160 reciprocating motion 160a 1st outer wall 160b 2nd outer wall 160c inner wall 160d Connector receiving part 170 Cylinder Head 170a First exterior wall section 170b 2nd outer wall 170c Connection Port Section 170c1 Pipe connection hole 170d Third exterior wall section 170e inner wall 170f Airflow channel section 170g Connector through hole 180 Interruption section 181 Concatenation 182 Block letters 190 Nozzle Cover 190a First exterior wall section 190a1 recess 190a2 Discharge hole 190b 2nd outer wall 190b1 Injection hole part 190c 1st inner wall section 190d 2nd inner wall section 190e 3rd inner wall section 191 Diffuser

Claims

1. A water jet device comprising a nozzle that sprays pressurized water to form a water jet, A water supply unit that supplies pressurized water to the nozzle by supplying pilot air, which is pressurized air, A block body that blocks the sprayed water when it is located at a passage position through which the sprayed water passes, and allows the sprayed water to pass when it is located at a non-pass position different from the passage position, A position changing unit that changes the position of the block body from the passing position to the non-passing position when the supply of pilot air is started, and changes the position of the block body from the non-passing position to the passing position when the supply of pilot air is stopped, A control unit that switches between a supply execution state in which the pilot air is supplied to the position change unit and the water supply unit, and a supply stop state in which the supply of the pilot air to the position change unit and the water supply unit is stopped, A water jet device equipped with the following features.

2. A water jet device comprising a nozzle for spraying pressurized water to form a water jet, A block body that blocks the sprayed water when it is located at a passage position through which the sprayed water passes, and allows the sprayed water to pass when it is located at a non-pass position different from the passage position, A position changing unit that changes the position of the block body between the passing position and the non-passing position, A nozzle cover having a housing space for housing the nozzle and the block body, and having an injection hole through which the sprayed water passes, and an injection hole for discharging the blocked water when the sprayed water is blocked by the block body, Equipped with, The nozzle cover has a plurality of discharge holes configured such that the water is discharged radially around the straight line of the spray direction, along a plane perpendicular to the straight line of the spray direction which is a straight line extending in the direction in which the water is sprayed.

3. A water jet device according to claim 2, A water jet device comprising an annular diffuser that disperses water by impacting at least a portion of the water discharged from the plurality of discharge holes.

4. A water jet device comprising a nozzle for spraying pressurized water to form a water jet, A block body that blocks the sprayed water when it is located at a passage position through which the sprayed water passes, and allows the sprayed water to pass when it is located at a non-pass position different from the passage position, A position changing unit that changes the position of the block body between the passing position and the non-passing position, Equipped with, The position-changing section has an airtightly sealed operating chamber to which pressurized air can be supplied, and comprises a reciprocating body, a biasing section, and a connecting body. The reciprocating body constitutes the wall of the operating chamber and is capable of reciprocating in the reciprocating direction between a position that maximizes the volume of the operating chamber and a position that minimizes the volume of the operating chamber. The biasing unit biases the reciprocating body in the direction that reduces the volume of the operating chamber, among the reciprocating motion directions, such that the reciprocating body is located at the minimum volume position when the pressurized air is not supplied to the operating chamber and at the maximum volume position when the pressurized air is supplied to the operating chamber. A water jet device in which the connecting body connects the reciprocating body and the block body such that when the reciprocating body is at the minimum volume position, the block body is positioned at the passage position, and when the reciprocating body is at the maximum volume position, the block body is positioned at the non-passage position.

5. A water jet device according to claim 4, The cylindrical body is tubular in shape and extends along the straight line of the injection direction, which is a straight line extending in the direction in which the water is injected, with the nozzle fixed to one end, and the internal space of the cylindrical body forming a flow path for supplying the pressurized water from the other end to the nozzle, The operating chamber is formed on the outer circumference of the cylindrical body, The biasing portion includes a coil spring whose central axis extends along the straight line of the injection direction and along the cylindrical surface surrounding the cylindrical body. The reciprocating body is cylindrical in shape, extending along the straight line of the jet direction, and the cylindrical body passes through the internal space of the reciprocating body, thereby penetrating the reciprocating body and being slidable relative to the cylindrical body.

6. A water jet device according to claim 5, The position-changing section forms a housing space for housing the nozzle and the block body, and includes a nozzle cover having an injection hole through which the sprayed water passes, and an injection hole for discharging the blocked water when the sprayed water is blocked by the block body. The nozzle cover has a shape in which the wall surface forming the housing space approaches the injection direction line as it approaches the injection hole. A water jet device in which the block body is configured to slide against the wall surface of the nozzle cover in conjunction with the reciprocating motion of the reciprocating body.

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