JP2011074687A - High-pressure washing apparatus and high-pressure washing vehicle equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To use a standard channel switching device without use of a channel switching device based on special specifications, in a high-pressure washing apparatus with three or more injection devices. <P>SOLUTION: When the channel switching valve 63 is switched to an off-state, first and second circulation pipes 72 and 73 communicate with each other via hydraulic piping 80; and a first hydraulic motor 65 is rotatively driven. On the other hand, when it is switched to an on-state, the first and third circulation pipes 72 and 74 communicate with each other; and the second and fourth circulation pipes 73 and 75 communicate with each other. In this case, when a channel witching valve 64 is switched to the off-state as the first one, the first and second circulation pipes 72 and 73 communicate with each other via hydraulic piping 81 through the third and fourth circulation pipes 74 and 75; and a second hydraulic motor 66 is rotatively driven. Additionally, when it is switched to the on-state, the first and second circulation pipes 72 and 73 communicate with each other via hydraulic piping 82 through the third and fourth circulation pipes 74 and 75; and a third hydraulic motor 67 is rotatively driven. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high-pressure cleaning device that cleans an object to be cleaned such as a sewage pipe and a drain pipe, and a high-pressure washing vehicle including the same.

  A high-pressure washing vehicle that cleans the inside of a pipe to be cleaned such as a sewer pipe or a drain pipe is known (see, for example, Patent Document 1). This type of high-pressure washing vehicle includes a hose having a washing nozzle at the tip, a hose reel around which the hose is wound, and a water pump for ejecting high-pressure water from the tip of the hose. At the time of the cleaning operation by the high pressure cleaning vehicle, the tip of the hose is inserted into the pipe to be cleaned from the manhole, the water pump is driven, and high pressure water is ejected from the cleaning nozzle at the tip of the hose.

  Further, with the cleaning nozzle of this high-pressure cleaning vehicle, there are cases where the cleaning nozzle cannot sufficiently remove the dirt particularly in a highly contaminated area such as around the manhole. Therefore, this high-pressure washing car is equipped with a washing gun in addition to the washing nozzle. When washing highly contaminated parts, the supply destination of washing water is switched from the washing nozzle to the washing gun. The cleaning can be performed by spraying.

  By the way, the boiler tube may be cleaned using a cleaning gun. In such a case, in order to further improve the cleaning effect of the cleaning gun, it is desirable to increase the pressure of the cleaning water to be jetted. Therefore, it is desirable not only to inject high-pressure washing water but also to inject ultra-high pressure washing water as necessary.

  Therefore, as described in Patent Document 2, a high-pressure washing vehicle that enables a plurality of injection states with different injection pressures has been developed. This high-pressure washing wheel has a first water passage whose one end is connected to the discharge side of the high pressure pump, a second water passage whose one end is connected to the discharge side of the ultrahigh pressure pump, a first water passage and a second water passage. A bypass passage connecting the water passage and a bypass valve provided in the bypass passage and remotely operated are provided.

  The first water flow path is set to a predetermined first pressure and provided with a first pressure regulating valve that operates when air is supplied. The second water flow path is set to a predetermined second pressure. A second pressure regulating valve that operates when air is supplied is provided, and an air supply device that remotely controls the supply of air to the first pressure regulating valve and the second pressure regulating valve is provided.

  In this high pressure washing vehicle, for example, if the bypass valve is opened and air is supplied to the first pressure regulating valve and the second pressure regulating valve, the first pressure (high pressure) is supplied from the first injection device or the second injection device. Wash water is jetted. Further, if the bypass valve is closed and air is supplied to the second pressure regulating valve, the second pressure (ultra-high pressure) washing water is injected from the second injection device. Further, if the bypass valve is closed and no air is supplied to either the first pressure regulating valve or the second pressure regulating valve, the first injection device or the second injection device is cleaned with a pressure (low pressure) equal to or lower than the first pressure. Water is jetted.

  By the way, the high-pressure washing vehicle described in Patent Literature 1 includes a hydraulic device that rotationally drives only one hose reel, for example, the first hose reel. When the hydraulic device is driven, the first injection device is The attached first hose is automatically wound or unwound. On the other hand, such a hydraulic device is not provided in the other hose reel, for example, the second hose reel.

  From the viewpoint of reducing the burden on workers, it is desirable that not only the feeding or winding of one of the hoses but also the feeding or winding of each hose is automated. If a plurality of operation panels are provided, it is necessary to receive a plurality of operation panels for operating the hydraulic apparatus and the like, which increases the size of the apparatus.

  Therefore, as described in Patent Document 3, an oil reservoir in which hydraulic oil is stored, a supply path having one end connected to the oil reservoir, a recovery path having one end connected to the oil reservoir, and a middle portion of the supply path A hydraulic pump for pumping hydraulic oil in the oil reservoir, a direction switching device to which the other ends of the supply path and the recovery path are connected, a first flow path and a first flow path having one end connected to the direction switching device, respectively. A second flow path, a flow path switching device to which the other ends of the first flow path and the second flow path are connected, a first hydraulic flow path having one end and the other end connected to the flow path switching device, one end and the other A second hydraulic flow path whose end is connected to the flow path switching device, a first hydraulic motor that is provided in the middle of the first hydraulic flow path and rotationally drives the first hose reel, and a middle of the second hydraulic flow path The second hose reel is provided to rotate the second hose reel. A high-pressure washing vehicle including a pressure motor, wherein the flow path switching device includes at least a first state in which the first flow path and the second flow path are communicated with each other via the first hydraulic flow path; The second switching passage is switchable to a second state in which the passage and the second flow passage communicate with each other via the second hydraulic flow passage, and the direction switching device communicates the supply passage with the first flow passage, and A first input state in which the two flow passages are communicated, a second input state in which the supply passage and the second flow passage are in communication and the recovery passage and the first flow passage are in communication, a supply passage and a recovery passage, A high-pressure washing car that can be switched to a cut-off state that communicates with each other has been developed.

  In this high pressure washing vehicle, when the flow path switching device is switched to the first state, the first flow path and the second flow path are communicated via the first hydraulic flow path. Therefore, hydraulic oil is supplied from the oil reservoir to the first hydraulic flow path, and the first hydraulic motor provided in the first hydraulic flow path is rotationally driven. On the other hand, when the flow path switching device is switched to the second state, the first flow path and the second flow path are communicated via the second hydraulic flow path. Then, hydraulic oil is supplied from the oil reservoir to the second hydraulic flow path, and the second hydraulic motor provided in the second hydraulic flow path is rotationally driven.

  Thus, in this high-pressure washing vehicle, by including the flow path switching device, a path for supplying hydraulic oil from the oil reservoir to the first hydraulic motor, and a path for supplying hydraulic oil from the oil reservoir to the second hydraulic motor, It is possible to share parts between the oil reservoir and the flow path switching device. Therefore, in a high-pressure washing vehicle having a plurality of injection devices, it is possible to automate the feeding or winding operation of the hose of each injection device without using a large-scale device.

Utility Model Registration No. 2510670 JP 2008-8065 A JP 2008-261206 A

  By the way, Patent Document 3 describes that the number of injection devices is not limited to two, and three or more injection devices may be provided. In this case, hydraulic motors and hydraulic pipes are provided for the number of injection devices, respectively. It is described that the flow path switching device is configured to be switchable to each state in which the first flow pipe and the second flow pipe communicate with each other through each hydraulic pipe.

  However, in order to realize such a high-pressure washing vehicle having three or more injection devices, it is necessary to use a flow path switching device that can be switched by the number of hydraulic pipes that are also received by the number of injection devices. However, since such a flow path switching device has a special specification, it is very expensive and causes a high cost.

  Therefore, in the present invention, in a high-pressure washing apparatus having three or more injection devices, an inexpensive high-pressure washing apparatus using a standard flow-path switching device without using a special-purpose flow-path switching device, and this It aims at realizing a high-pressure washing car equipped with.

  The high-pressure cleaning device of the present invention has a first injection device for injecting cleaning water at the tip, a first hose reel around which a first hose for guiding the cleaning water to the first injection device is wound, and injection of cleaning water at the tip And a second hose reel around which a second hose for guiding the cleaning water to the second injection device is wound, and a third injection device for injecting the cleaning water at the tip is attached to the third injection device. A third hose reel around which a third hose for guiding cleaning water is wound, an oil reservoir for storing hydraulic oil, a supply path having one end connected to the oil reservoir, a recovery path having one end connected to the oil reservoir, A hydraulic pump that is provided in the middle of the supply path and pumps hydraulic oil in the oil reservoir, a direction switching device to which the other ends of the supply path and the recovery path are connected, and one end connected to the direction switching device. The first flow path and the second flow path, the first flow path switching device to which the other ends of the first flow path and the second flow path are connected, and one end of each of the first flow path and the second flow path are connected to the first flow path switching device. The third flow path and the fourth flow path, the second flow path switching device to which the other ends of the third flow path and the fourth flow path are connected, and the one end and the other end are connected to the first flow path switching device. A first hydraulic flow path, a second hydraulic flow path having one end and the other end connected to the second flow path switching device, and a third hydraulic flow path having one end and the other end connected to the second flow path switching device; A first hydraulic motor that is provided in the middle of the first hydraulic flow path and rotationally drives the first hose reel; and a second hydraulic pressure that is provided in the middle of the second hydraulic flow path and rotationally drives the second hose reel. A motor, and a third hydraulic motor provided in the middle of the third hydraulic flow path for rotating the third hose reel, The flow path switching device communicates at least the first state in which the first flow path and the second flow path are communicated with each other via the first hydraulic flow path, and the first flow path and the third flow path. The second flow path switching device can be switched between a second flow path and a second state in which the fourth flow path communicates, and at least the third flow path and the fourth flow path are connected to the second hydraulic flow path. A first state that communicates via the third hydraulic passage and a second state that communicates the third and fourth fluid passages via the third hydraulic flow path, and the direction switching device is at least supplied A first input state in which the path and the first flow path are in communication and the recovery path and the second flow path are in communication; a supply path and the second flow path are in communication; and the recovery path and the first flow path are in communication It is switchable between a second on state for communication and a cut off state for connecting the supply path and the recovery path. .

  According to the high pressure washing apparatus of the present invention, when the first flow path switching device is switched to the first state, the first flow path and the second flow path are communicated via the first hydraulic flow path. Therefore, hydraulic oil is supplied from the oil reservoir to the first hydraulic flow path, and the first hydraulic motor provided in the first hydraulic flow path is rotationally driven. On the other hand, when the first flow path switching device is switched to the second state, the first flow path and the third flow path are communicated, and the second flow path and the fourth flow path are communicated. Here, when the second flow path switching device is switched to the first state, the first flow path and the second flow path are communicated via the second hydraulic flow path through the third flow path and the fourth flow path. . Therefore, hydraulic oil is supplied from the oil reservoir to the second hydraulic flow path, and the second hydraulic motor provided in the second hydraulic flow path is rotationally driven. Further, when the second flow path switching device is switched to the second state, the first flow path and the second flow path are communicated through the third hydraulic flow path through the third flow path and the fourth flow path. Therefore, hydraulic oil is supplied from the oil reservoir to the third hydraulic flow path, and the third hydraulic motor provided in the third hydraulic flow path is rotationally driven.

  Thus, according to the high-pressure washing apparatus of the present invention, by providing the first flow path switching device and the second flow path switching device, the parts between the oil reservoir and the first flow path switching device are shared. It is possible to switch the path for supplying hydraulic oil from the oil reservoir to the first hydraulic motor, the second hydraulic motor, and the third hydraulic motor. Thereby, the feeding or winding operation of the first hose, the second hose and the third hose to which the first injection device, the second injection device and the third injection device are respectively attached can be automated.

  In the high-pressure washing device of the present invention, a direction switching device is provided between the first flow path switching device and the oil reservoir to change the flow direction of the hydraulic oil flowing through the first flow path and the second flow path. Yes. Therefore, there are a path for supplying hydraulic oil from the oil reservoir to the first hydraulic motor, a path for supplying hydraulic oil from the oil reservoir to the second hydraulic motor, and a path for supplying hydraulic oil from the oil reservoir to the third hydraulic motor. It is possible to share the direction switching device. Thereby, even if it is a case where the injection apparatus to be used is changed, it is possible to switch the feeding or winding of the hose using the same direction switching device without moving. Therefore, in the high-pressure washing device of the present invention, it is possible to automate the operation of feeding or winding the hoses of the first injection device, the second injection device, and the third injection device, and to facilitate the operation thereof.

  Further, the high-pressure washing apparatus of the present invention includes a first bypass passage that bypasses the second hydraulic flow path before and after the second hydraulic motor via the first throttle valve, or the third hydraulic pressure before and after the third hydraulic motor. It is desirable to have one or both of the second bypass passages that bypass the flow path via the second throttle valve. As described above, in the high-pressure washing device of the present invention, when the first flow path switching device is switched to the first state, the first flow path and the second flow path are communicated via the first hydraulic flow path, The second hydraulic flow path is cut off from the first flow path and the second flow path, but the second hydraulic flow path is bypassed before and after the second hydraulic motor by opening the first throttle valve. Therefore, the hydraulic oil can flow through the second hydraulic motor, and the second hose reel can be manually rotated. Similarly, depending on the switching state of the first flow path switching device and the second flow path switching device, the third hydraulic flow path is blocked from the first flow path and the second flow path, but the second throttle valve is opened. Thus, the third hydraulic path is bypassed before and after the third hydraulic motor. For this reason, the hydraulic oil can flow through the third hydraulic motor, and the third hose reel can be manually rotated.

  The high-pressure cleaning device of the present invention desirably has a throttle valve in one or both of the middle part of the second hydraulic flow path and the middle part of the third hydraulic flow path. As described above, in the high-pressure washing apparatus of the present invention, when the first flow path switching device is switched to the second state and the second flow path switching device is switched to the first state, the third flow path and the fourth flow path The first flow passage and the second flow passage are communicated with each other through the second passage through the second hydraulic passage, and the hydraulic oil is supplied from the oil reservoir to the second hydraulic passage, and is provided in the second hydraulic passage. The hydraulic motor is driven to rotate. By having a throttle valve in the middle of the second hydraulic flow path, the amount of hydraulic oil supplied from the oil reservoir to the second hydraulic flow path can be reduced by the opening of the throttle valve. The driving force of the second hydraulic motor can be set to be different from the driving force of the first hydraulic motor. Similarly, by having a throttle valve in the middle of the third hydraulic flow path, it becomes possible to limit the amount of hydraulic oil supplied from the oil reservoir to the third hydraulic flow path by the opening of the throttle valve, It becomes possible to set the driving force of the third hydraulic motor to be different from the driving force of the first hydraulic motor.

  According to the high pressure cleaning device of the present invention, in the high pressure cleaning device having three or more injection devices, the first channel switching device and the second channel switching device are used without using the channel switching device having a special specification. As a result, it is possible to realize an inexpensive high-pressure washing device and a high-pressure washing vehicle equipped with the same by using a standard flow path switching device.

It is a side view of the high-pressure washing truck in an embodiment of the invention. It is a top view of the high-pressure washing car of FIG. It is a rear view of the high-pressure washing vehicle of FIG. It is a water circuit diagram of the high-pressure washing truck in this embodiment. It is a hydraulic circuit diagram of the high-pressure washing car in this embodiment. It is a circuit diagram which shows a part of electric circuit of the high-pressure washing vehicle in this embodiment.

  1 is a side view of a high-pressure washing vehicle according to an embodiment of the present invention, FIG. 2 is a plan view, and FIG. 3 is a rear view. As shown in FIGS. 1 to 3, the high-pressure washing vehicle 1 according to this embodiment includes a subframe 11, a water tank 12, a pump chamber 13, a large hose reel 2, and a small hose reel 3 on a chassis 10. And a high-pressure washing apparatus comprising an ultra-high pressure hose reel 4 and an operation panel 5.

  The water tank 12 and the pump chamber 13 are mounted on the subframe 11. The water tank 12 stores wash water. The pump chamber 13 accommodates a water pump 14 for pumping the cleaning water in the water tank 12. A turntable 6 that can rotate around the vertical axis is mounted on the rear end of the subframe 11. The large hose reel 2, the small hose reel 3 and the operation panel 5 are mounted on the turntable 6. The ultra high pressure hose reel 4 is mounted on the right side of the rear end of the chassis 10.

  The large hose reel 2 is a first hose reel on which a large hose 2a (see FIG. 4) as a first hose is wound. The small hose reel 3 is a second hose reel on which a small hose 3a (see FIG. 4) as a second hose is wound. The ultra high pressure hose reel 4 is a third hose reel around which an ultra high pressure hose 4a (see FIG. 4) as a third hose is wound. A cleaning nozzle 2b, a cleaning gun 3b, and a cleaning gun 4b as first to third cleaning devices are attached to the ends of the large hose 2a, small hose 3a, and ultrahigh pressure hose 4a, respectively.

  The operation panel 5 is used for rotating the large hose reel 2, the small hose reel 3 and the ultra high pressure hose reel 4, and for operating the high pressure water from the large hose 2a, the small hose 3a and the ultra high pressure hose 4a. It is. The operation panel 5 includes an operation lever 15 for operating forward / reverse rotation of the large hose reel 2, the small hose reel 3, and the ultra high pressure hose reel 4, a large / small hose reel changeover switch 16, an ultra high pressure / high pressure changeover switch 17, and an ultra high pressure. A selection display lamp 110 (see FIG. 6) and the like are provided.

  Further, a vehicle travel engine (not shown) is mounted on the chassis 10, and the rotational power of the engine is driven through a clutch (not shown) and a gear box (not shown). As a propeller shaft (not shown). The propeller shaft drives the wheels 7 via the differential 8.

  Next, the configuration of the water circuit of the high-pressure washing vehicle 1 will be described with reference to FIG. FIG. 4 is a water circuit diagram of the high-pressure washing vehicle in the present embodiment.

  As shown in FIG. 4, the water circuit 20 of the high pressure washing vehicle 1 includes a water tank 12, a water pump 14, a high pressure regulating valve 21, an ultra high pressure regulating valve 22, an ultra high pressure stop valve 23, A high-pressure emergency safety valve 24, an ultra-high pressure emergency safety valve 25, a manifold 27, a large hose cutoff valve 28, a small hose cutoff valve 29, an ultra-high pressure hose cutoff valve 30, and the like are provided. The large hose cutoff valve 28, the small hose cutoff valve 29, and the ultra-high pressure hose cutoff valve 30 are electromagnetic valves.

  The water pump 14 is an integrated high-pressure pump and ultrahigh-pressure pump, and is driven simultaneously by a single drive shaft (not shown). The drive shaft is driven by a vehicle traveling engine connected through a pulley, a V belt, a drive shaft, and a PTO (power take-off device) (not shown). The water pump 14 includes a high pressure discharge portion 14a, an ultra high pressure discharge portion 14b, and a suction portion 14c. The high-pressure discharge part 14a and the suction part 14c constitute a high-pressure pump, and the ultrahigh-pressure discharge part 14b and the suction part 14c constitute an ultra-high-pressure pump. The suction part 14c is a common suction part for the high-pressure pump and the ultrahigh-pressure pump.

  The water tank 12 and the suction part 14 c of the water pump 14 are connected via a pipe 40. In the middle of the pipe 40, an on-off valve 31 and a strainer 32 are provided in order from the upstream side (water tank 12 side) to the downstream side (water pump 14 side). A drain valve 33 is provided at the drain port of the strainer 32. A drain valve 34 is also provided between the on-off valve 31 and the strainer 32.

  The high-pressure discharge part 14 a of the water pump 14 is connected to the inflow port 21 a of the high-pressure pressure regulating valve 21 via the pipe 41. The high-pressure regulating valve 21 is a three-way valve that is remotely operated, and is turned on / off depending on whether or not air is supplied. One outflow port 21 b of the high pressure regulating valve 21 is connected to the manifold 27 via a pipe 42. A return port 21 c of the high pressure regulating valve 21 is connected to the water tank 12 via a return pipe 43. The large hose 2a and the small hose 2b are connected to the manifold 27 via pipes 42a and 42b, respectively. The large hose cutoff valve 28 and the small hose cutoff valve 29 are provided in the middle of the pipes 42a and 42b, respectively. A drain valve 35 is provided in the middle of the pipe 41, and a drain valve 36 is provided in the middle of the pipe 42.

  The high pressure regulating valve 21 is turned on when air is supplied, and guides the wash water flowing from the pipe 41 to the pipe 42. However, when the pressure regulating valve 21 for high pressure becomes equal to or higher than a predetermined set pressure, the pressure is adjusted to the set pressure by allowing a part of the washing water to escape to the return pipe 43. The set pressure of the high pressure regulating valve 21 is configured to be changed by the pressure of the supplied air. On the other hand, the high-pressure regulating valve 21 is turned off when air is not supplied, and the wash water flowing from the pipe 41 is guided to the return pipe 43 and discharged to the water tank 12.

  The super high pressure discharge part 14 b of the water pump 14 is connected to the super high pressure hose 4 a via a pipe 44. The ultra high pressure hose cutoff valve 30 is provided in the middle of the pipe 44. A pressure gauge 37 and a drain valve 38 are provided upstream of the ultrahigh pressure hose cutoff valve 30 in the pipe 44. In addition, one end of the branch pipe 45 is connected to a midway part of the pipe 44 upstream of the ultrahigh pressure hose cutoff valve 30. The other end of the branch pipe 45 is connected to the first port 23 a of the ultra high pressure stop valve 23.

  The ultra-high pressure stop valve 23 is a three-way valve that is remotely operated, and the communication state is switched depending on whether or not air is supplied. The second port 23 b of the ultra-high pressure stop valve 23 is connected to the middle portion of the pipe 41 via the bypass pipe 46. The third port 23 c of the ultra-high pressure stop valve 23 is connected to the ultra-high pressure regulating valve 22 via a pipe 47. The ultra high pressure stop valve 23 is turned on when air is supplied, and the first port 23a, the second port 23b, and the third port 23c communicate with each other. On the other hand, when the air is not supplied, the ultra high pressure stop valve 23 is turned off, the first port 23a and the third port 23c communicate with each other, and the second port 23b is shut off. That is, when air is not supplied to the ultra high pressure stop valve 23, the bypass pipe 46 is closed.

  The ultra-high pressure regulating valve 22 is also remotely operated and is turned on / off depending on whether air is supplied or not. The pipe 47 is connected to the inflow port 22 a of the ultrahigh pressure regulating valve 22. The outflow port 22 b of the ultrahigh pressure regulating valve 22 is connected to the water tank 12 via a pipe 48.

  The ultra-high pressure regulating valve 22 is turned on when air is supplied, and when the pressure becomes equal to or higher than a predetermined set pressure, the pressure is adjusted to the set pressure by allowing a part of the washing water to escape to the pipe 48. The set pressure of the super pressure adjusting valve 22 is configured to be changed by the pressure of the supplied air. On the other hand, the ultrahigh pressure regulating valve 22 is turned off when air is not supplied, and the pipe 48 is closed.

  In addition, one end of a pipe 49 is connected to the inflow port 24 a of the high-pressure emergency safety valve 24. The other end of the pipe 49 is connected to the pipe 41. On the other hand, one end of a pipe 50 is connected to the return port 24 b of the high-pressure emergency safety valve 24. The other end of the pipe 50 is connected to the water tank 12. The high-pressure emergency safety valve 24 opens when the high-pressure pressure regulating valve 21 malfunctions and the pipe 49 becomes abnormally high in pressure, guides a part of the wash water of the pipe 49 from the pipe 49 to the pipe 50 and discharges it to the water tank 12. .

  Further, one end of a pipe 51 is connected to the inflow port 25a of the emergency safety valve 25 for ultrahigh pressure. The other end of the pipe 51 is connected to the middle part of the pipe 44. On the other hand, one end of a pipe 52 is connected to the outflow port 25b of the emergency safety valve 25 for ultrahigh pressure. The other end of the pipe 52 is connected to the water tank 12. The emergency safety valve 25 for ultra-high pressure opens when the pressure control valve 22 for ultra-high pressure malfunctions and the pipe 51 becomes abnormally high in pressure, and leads a part of the wash water of the pipe 51 from the pipe 51 to the pipe 52 to the water tank 12. Discharge.

  Next, referring to FIG. 5, a hydraulic device 9 that drives the large hose reel 2, the small hose reel 3, and the super high pressure hose reel 4 of the high pressure washing vehicle 1 to rotate forward and backward will be described. FIG. 5 is a diagram showing the hydraulic device 9 of the high-pressure washing vehicle 1 in the present embodiment.

  As shown in FIG. 5, the hydraulic device 9 of the high-pressure washing vehicle 1 includes an oil reservoir 60 in which hydraulic oil is stored, a hydraulic pump 61 that pumps hydraulic oil in the oil reservoir 60, and a rotation direction of a hydraulic motor that will be described later. Control valve 62 as a direction switching device for switching between, flow path switching valves 63, 64 as first and second flow path switching devices, and first to third hydraulic motors 65, 66, 67. Yes.

  The oil reservoir 60 is connected to one end of a supply pipe 70 as a hydraulic oil supply path and a recovery pipe 71 as a recovery path. The other ends of the supply pipe 70 and the recovery pipe 71 are connected to the P port and T port of the control valve 62, respectively. Further, one end of a first flow pipe 72 as a first flow path and one end of a second flow pipe 73 as a second flow path are connected to the A port and the B port of the control valve 62, respectively.

  The hydraulic pump 61 is provided in the middle of the supply pipe 70. The hydraulic pump 61 is coupled to the drive shaft described above via a power transmission mechanism (not shown), and is driven by a vehicle traveling engine via a PTO to which the drive shaft is connected.

  The control valve 62 is configured to be switchable between a first on state, a second on state, and a off state. Specifically, when the control valve 62 is switched to the first on state, the first communication passage 90 that connects the supply pipe 70 and the first flow pipe 72, the recovery pipe 71, and the second flow pipe 73. And a second communication passage 91 that communicates with each other. Further, when the control valve 62 is switched to the second on state, the control pipe 62 communicates the third communication path 92 that connects the supply pipe 70 and the second flow path 73, and the recovery pipe 71 and the first flow path 72. And a fourth communication passage 93. Further, when the control valve 62 is switched to the cut-off state, the supply pipe 70 and the recovery pipe 71 are communicated, and the communication between the supply pipe 70 and the first distribution pipe 72 or the second distribution pipe 73 is released, and the recovery is performed. The communication between the pipe 71 and the first flow pipe 72 or the second flow pipe 73 is released.

  The control valve 62 includes flow control mechanisms 90a, 91a, 92a, and 93a in the first communication path 90, the second communication path 91, the third communication path 92, and the fourth communication path 93, respectively. The flow rate control mechanisms 90 a, 91 a, 92 a, and 93 a are configured to change the opening areas of the first to fourth communication paths 90 to 93 according to the inclination angle of the operation lever 15 described above. With such a configuration, when the control valve 62 is switched, the direction of the hydraulic oil flowing through the first flow pipe 72 and the second flow pipe 73 is changed. Thereby, the rotation direction of the 1st-3rd hydraulic motors 65, 66, and 67 mentioned later will be changed.

  Further, by using the operation lever 15, the flow rate of the hydraulic oil flowing into the first circulation pipe 72 or the second circulation pipe 73 is changed according to the position of the operation lever 15. As a result, the rotational speeds of first to third hydraulic motors 65, 66, and 67, which will be described later, that is, the large hose 2a, the small hose 3a, and the large hose reel 2, the small hose reel 3, and the ultrahigh pressure hose reel 4, respectively. The feeding speed and winding speed of the ultrahigh pressure hose 4a are changed.

  The other ends of the first flow pipe 72 and the second flow pipe 73 are connected to the first flow path switching valve 63. The flow path switching valve 63 includes first to sixth ports a to f. The other end of the first flow pipe 72 is connected to the first port a, and the other end of the second flow pipe 73 is connected to the second port b. The third port c is connected to one end of a hydraulic pipe 80 as a first hydraulic flow path, and the other end of the hydraulic pipe 80 is connected to the fifth port e. One end of a third flow pipe 74 as a third flow path is connected to the fourth port d, and one end of a fourth flow pipe 75 as a fourth flow path is connected to the sixth port f.

  The other ends of the third flow pipe 74 and the fourth flow pipe 75 are connected to the second flow path switching valve 64. The flow path switching valve 64 includes first to sixth ports a to f. The other end of the third flow pipe 74 is connected to the first port a, and the other end of the fourth flow pipe 75 is connected to the second port b. The third port c is connected to one end of a hydraulic pipe 81 as a second hydraulic flow path, and the other end of the hydraulic pipe 81 is connected to the fifth port e. One end of a hydraulic pipe 82 as a third hydraulic flow path is connected to the fourth port d, and the other end of the hydraulic pipe 82 is connected to the sixth port f.

  In the present embodiment, the flow path switching valves 63 and 64 are constituted by electromagnetic valves. The flow path switching valve 63 is connected to the above-described large and small hose reel switching switch 16, and is switched between an on state and an off state by the large and small hose reel switching switch 16. The flow path switching valve 64 is connected to the aforementioned ultra-high pressure / high-pressure switch 17 and is switched between an on state and an off state by the ultra-high pressure / high pressure switch 17. In the off state (non-energized state), the flow path switching valves 63 and 64 cause the first port a and the third port c to communicate with each other and the second port b and the fifth port e to communicate with each other. In the state), the first port a and the fourth port d are communicated, and the second port b and the sixth port f are communicated.

  Specifically, when the flow path switching valve 63 is turned off, the first port a and the third port c communicate with each other, and the second port b and the fifth port e communicate with each other. 72 and the second flow pipe 73 communicate with each other through a hydraulic pipe 80. On the other hand, when the flow path switching valve 63 is turned on, the first port a and the fourth port d communicate with each other, and the second port b and the sixth port f communicate with each other. The third flow pipe 74 communicates with the second flow pipe 73 and the fourth flow pipe 75 communicates with each other.

  When the flow path switching valve 64 is turned off, the first port a and the third port c communicate with each other, and the second port b and the fifth port e communicate with each other. The four flow pipes 75 communicate with each other through the hydraulic pipe 81. On the other hand, when the flow path switching valve 64 is turned on, the first port a and the fourth port d are communicated with each other, and the second port b and the sixth port f are communicated with each other. The four flow pipes 75 communicate with each other via the hydraulic pipe 82.

  The hydraulic motors 65, 66, and 67 described above are provided in the middle of the hydraulic pipes 80, 81, and 82, respectively. The hydraulic motors 65, 66, and 67 are rotationally driven by hydraulic oil that flows through the hydraulic pipes 80, 81, and 82, respectively. The hydraulic motor 65 is connected to the large hose reel 2 via a connector (not shown), and the large hose reel 2 is driven to rotate by the hydraulic motor 65.

  The hydraulic motor 66 is connected to the small hose reel 3 via a connector (not shown), and the small hose reel 3 is rotationally driven by the hydraulic motor 66. The hydraulic motor 67 is connected to the ultrahigh pressure hose reel 4 via a connector (not shown), and the ultrahigh pressure hose reel 4 is rotationally driven by the hydraulic motor 67.

  With the above configuration, in the high-pressure washing vehicle 1 according to the present embodiment, when the flow path switching valve 63 is switched to the OFF state as the first state, the first flow pipe 72 and the second flow pipe 73 are connected via the hydraulic pipe 80. Communicated. Therefore, hydraulic oil is supplied from the oil reservoir 60 to the hydraulic pipe 80, and the first hydraulic motor 65 provided in the hydraulic pipe 80 is rotationally driven. On the other hand, when the flow path switching valve 63 is switched to the ON state as the second state, the first flow pipe 72 and the third flow pipe 74 are communicated, and the second flow pipe 73 and the fourth flow pipe 75 are connected. Communicated.

  Here, when the flow path switching valve 64 is switched to the OFF state as the first state, the first flow pipe 72 and the second flow pipe 73 pass through the hydraulic pipe 81 through the third flow pipe 74 and the fourth flow pipe 75. Is communicated via. Therefore, hydraulic oil is supplied from the oil reservoir 60 to the hydraulic pipe 81, and the second hydraulic motor 66 provided in the hydraulic pipe 81 is rotationally driven.

  When the flow path switching valve 64 is switched to the ON state as the second state, the first flow pipe 72 and the second flow pipe 73 are connected via the hydraulic pipe 82 through the third flow pipe 74 and the fourth flow pipe 75. Communicated. Therefore, hydraulic oil is supplied from the oil reservoir 60 to the hydraulic pipe 82, and the third hydraulic motor 67 provided in the hydraulic pipe 82 is rotationally driven.

  That is, in the high-pressure washing vehicle 1 according to the present embodiment, when the flow path switching valves 63 and 64 are switched, the hydraulic pipes (hydraulic pipes 80, 81, 82) in which the first flow pipe 72 and the second flow pipe 73 communicate with each other. It will be switched. Then, the hydraulic motors 65, 66, and 67 that are rotationally driven by the hydraulic oil are switched. Thereby, the hose reel (the large hose reel 2, the small hose reel 3, or the ultra-high pressure hose reel 4) to be rotationally driven is changed.

  Further, bypass paths 83 and 84 that bypass the front and rear of the hydraulic motors 66 and 67 are connected to the hydraulic pipes 81 and 82, respectively. In the middle of the bypass passages 83 and 84, throttle valves 94 and 95 are provided, respectively. Thereby, even if the flow path switching valve 63 is turned off and the third flow pipe 74 and the fourth flow pipe 75 are cut off, the hydraulic pipes are opened by opening the bypass paths 83 and 84, respectively. 81 and 82 are bypassed, the hydraulic oil can pass through the hydraulic motors 66 and 67, and the small hose reel 3 and the ultra high pressure hose reel 4 can be manually rotated.

  Further, throttle valves 96 and 97 are provided in the middle of the hydraulic pipes 81 and 82, respectively. These throttle valves 96 and 97 change the flow areas of the hydraulic oil passing through the hydraulic motors 66 and 67 by changing the opening areas of the hydraulic pipes 81 and 82, respectively, and set the rotation speeds of the hydraulic motors 66 and 67. Is to do.

  Next, with reference to FIG. 6, the electric circuit configuration of the operating system of the large hose reel 2, the small hose reel 3 and the super high pressure hose reel 3 of the high pressure washing vehicle 1 will be described. FIG. 6 is a circuit diagram showing a part of an electric circuit of the high-pressure washing vehicle 1 in the present embodiment.

  As shown in FIG. 6, the electric circuit 100 of the high-pressure washing vehicle 1 includes an operation circuit unit 101 for the large hose reel 2, the small hose reel 3, and the ultra-high pressure hose reel 3, the large hose reel 2, the small hose reel 3, and the super circuit. And a drive circuit portion 102 of the high-pressure hose reel 3. In FIG. 6, reference numeral 103 denotes a power line that is energized by key-on and PTO-on, 104 is a power line that is energized by key-on, and 105 is an earth line.

  The operation circuit unit 101 is provided with an ultra-high pressure / high pressure changeover switch 17 and a large / small hose reel changeover switch 16. The ultra-high pressure / high-pressure switch 17 is a 1-circuit 1-contact switch having an ultra-high pressure injection side contact and a stop side contact. The large / small hose reel changeover switch 16 is a two-circuit, three-contact switch having a large hose reel selection side contact, a small hose reel selection side contact, and a stop side contact. The contacts on the power supply line 103 side of the large and small hose reel changeover switch 16 are connected to each other.

  The ultra high pressure / high pressure changeover switch 17 is energized only when the large / small hose reel changeover switch 16 is turned on at the stop side contact. When the ultra-high pressure / high-pressure switch 17 is turned on to the ultra-high pressure injection side contact, the R6 relay and the ultra-high pressure selection display lamp 110 are energized. On the other hand, when the ultra-high pressure / high pressure changeover switch 17 is turned on at the stop-side contact point, it is not energized.

  Further, when the large / small hose reel changeover switch 16 is turned on to the large hose reel selection side contact, the R7 relay is energized. On the other hand, when the large / small hose reel changeover switch 16 is inserted into the small hose reel selection side contact, the R8 relay is energized.

  The drive circuit unit 102 is provided with R6 relay contacts 120, 121, 122, an R7 relay contact 123, and an R8 relay contact 124. The R6 relay contacts 120 and 121 are normally open and are a contacts that are closed by excitation of the R6 relay. The R6 relay contact 122 is normally closed and is a b contact that is opened by excitation of the R6 relay. The R7 relay contact 123 is normally open and is an a contact that is closed by excitation of the R7 relay. The R8 relay contact 124 is normally open, and is an a contact that is closed by excitation of the R8 relay.

  In the electric circuit 100 having the above-described configuration, when the large / small hose reel changeover switch 16 is inserted into the large hose reel selection side contact, the R7 relay is energized and the R6 relay and R8 relay are not energized, so the R7 relay contact 123 is closed. , R6 relay contacts 120, 121 and R8 relay contact 124 are open. As a result, the solenoid 28a of the large hose cutoff valve 28 is energized and the large hose cutoff valve 28 is opened, so that cleaning water can be discharged from the large hose 2a. Further, since the solenoid 63a of the flow path switching valve 63 is in a non-energized state and the flow path switching valve 63 is turned off, the hydraulic motor 65 of the large hose reel 2 can be operated as described above.

  Further, when the large / small hose reel changeover switch 16 is turned on to the small hose reel selection side contact, the R8 relay is energized and the R6 relay and R7 relay are not energized. 121 and R7 relay contact 123 are open, and R6 relay contact 122 is closed. As a result, the solenoid 29a of the small hose cutoff valve 29 is energized and the small hose cutoff valve 29 is opened, so that cleaning water can be discharged from the small hose 3a. Further, since the solenoid 63a of the flow path switching valve 63 is energized and the solenoid 64a of the flow path switching valve 64 is not energized, the flow path switching valve 63 is turned on and the flow path switching valve 64 is turned off. As a result, the hydraulic motor 66 of the small hose reel 3 can be operated as described above.

  In addition, when the high / low pressure switch 17 is turned on to the super high pressure injection side contact while the large / small hose reel change switch 16 is turned on to the stop side contact, the R6 relay is energized, and the R7 relay and R8 relay are turned on. Is not energized, R6 relay contacts 120 and 121 are closed, and R6 relay contact 122, R7 relay contact 123 and R8 relay contact 124 are opened. As a result, the solenoid 30a of the ultrahigh pressure hose cutoff valve 30 is energized and the ultrahigh pressure hose cutoff valve 29 is opened, so that the cleaning water can be discharged from the ultrahigh pressure hose 4a. In the present embodiment, since the cutoff valve SW3 is provided in series with the solenoid 30a, the cleaning water can be instantaneously and vigorously injected by turning on the cutoff valve SW3 at the time of super-high pressure injection. Further, since the solenoid 63a of the flow path switching valve 63 and the solenoid 64a of the flow path switching valve 64 are energized, both the flow path switching valves 63 and 64 are turned on. As a result, the hydraulic motor 67 of the super high pressure hose reel 4 can be operated as described above.

  The high pressure washing vehicle 1 in the present embodiment has a low pressure injection operation for injecting low pressure washing water from the washing gun 3b attached to the tip of the small hose 3a and a washing nozzle attached to the tip of the large hose 2a. A first high-pressure injection operation for injecting high-pressure cleaning water from 2b, a second high-pressure injection operation for injecting high-pressure cleaning water from a cleaning gun 3b attached to the tip of the small hose 3a, and a tip of the ultra-high pressure hose 4a. It is possible to selectively execute an ultra-high pressure injection operation of injecting ultra-high pressure cleaning water from the attached cleaning gun 4b.

  The low-pressure injection operation is suitable, for example, when washing around the manhole. The first and second high-pressure injection operations are suitable, for example, when high-pressure cleaning is performed around the manhole. The ultra-high pressure injection operation is suitable for cleaning boiler piping, for example. Hereinafter, these operations will be described in detail.

<Low pressure injection operation>
First, the low-pressure injection operation for injecting low-pressure cleaning water from the cleaning gun 4b of the ultra-high pressure hose 4a will be described. When the ultra-high pressure / high-pressure switch 17 is inserted into the ultra-high pressure injection side contact and the cutoff valve SW3 is turned on with the large / small hose reel switch 16 of the operation panel 5 being inserted into the stop side contact, as described above. In addition, the hydraulic motor 67 of the ultra-high pressure hose reel 4 can be operated, and the ultra-high pressure hose shut-off valve 30 is opened, so that cleaning water can be discharged from the ultra-high pressure hose 4a. At this time, the large hose cutoff valve 28 and the small hose cutoff valve 29 are closed.

  In the low pressure injection operation, the high pressure regulating valve 21 and the ultrahigh pressure regulating valve 22 shown in FIG. 4 are turned off, and air is supplied to the ultrahigh pressure stop valve 23 to be turned on. The port 23a, the second port 23b, and the third port 23c are in communication with each other.

  Thereby, the wash water in the water tank 12 is sucked into the suction portion 14 c of the water pump 14 through the pipe 40. The wash water discharged from the high pressure discharge portion 14a is diverted, and a part of the wash water passes through the high pressure regulating valve 21 and is returned into the water tank 12 through the return pipe 43. On the other hand, the other wash water after the diversion flows through the bypass pipe 46. The cleaning water discharged from the super high pressure discharge part 14b merges with the cleaning water from the bypass pipe 46, is supplied to the super high pressure hose 4a through the pipe 44, and is jetted from the cleaning gun 4b as low pressure cleaning water. The

<First high-pressure injection operation>
Next, the first high-pressure injection operation for injecting high-pressure cleaning water from the cleaning nozzle 2b of the large hose 2a will be described. When the large / small hose reel changeover switch 16 of the operation panel 5 is turned on to the large hose reel selection side contact, the hydraulic motor 65 of the large hose reel 2 becomes operable as described above, and the large hose cutoff valve 28 opens, Wash water can be discharged from the large hose 2a. At this time, the small hose cutoff valve 29 and the ultra-high pressure hose cutoff valve 30 are closed.

  In the first high pressure injection operation, air is supplied to the high pressure regulating valve 21, the ultra high pressure regulating valve 22 and the ultra high pressure stop valve 23 shown in FIG. As a result, the high pressure regulating valve 21 is set to the first pressure (predetermined high pressure value, for example, 20 MPa), and the ultrahigh pressure regulating valve 22 is set to the second pressure (predetermined ultrahigh pressure value, for example, 57 MPa). The In addition, the ultra high pressure stop valve 23 is in a state where the first port 23a, the second port 23b, and the third port 23c communicate with each other.

  Thereby, the wash water in the water tank 12 is sucked into the suction portion 14 c of the water pump 14 through the pipe 40. The cleaning water discharged from the ultrahigh pressure discharge portion 14 b flows into the bypass pipe 46 through the ultrahigh pressure stop valve 23. The wash water discharged from the high pressure discharge portion 14a to the pipe 41 merges with the wash water from the bypass pipe 46, and then passes through the high pressure regulating valve 21 to flow through the pipe 44. Through the manifold 27 and the pipe 42a, the large hose 2a To be supplied. Since the high pressure regulating valve 21 is set to the first pressure, the pressure of the washing water supplied to the large hose 2a is the first pressure. The high-pressure washing water supplied to the large hose 2a is jetted from the washing nozzle 2b.

<Second high pressure injection operation>
Next, the second high-pressure injection operation for injecting high-pressure cleaning water from the cleaning gun 3b of the small hose 3a will be described. When the large / small hose reel changeover switch 16 of the operation panel 5 is inserted into the small hose reel selection side contact, the hydraulic motor 66 of the small hose reel 3 becomes operable as described above, and the small hose cutoff valve 29 opens, Wash water can be discharged from the small hose 3a. At this time, the large hose cutoff valve 28 and the ultrahigh pressure hose cutoff valve 30 are closed.

  In the second high pressure injection operation, air is supplied to the high pressure regulating valve 21, the ultra high pressure regulating valve 22, and the ultra high pressure stop valve 23 shown in FIG. As a result, the high pressure regulating valve 21 is set to the first pressure, and the ultrahigh pressure regulating valve 22 is set to the second pressure. In addition, the ultra high pressure stop valve 23 is in a state where the first port 23a, the second port 23b, and the third port 23c communicate with each other.

  Thereby, the wash water in the water tank 12 is sucked into the suction portion 14 c of the water pump 14 through the pipe 40. The cleaning water discharged from the ultrahigh pressure discharge portion 14 b flows into the bypass pipe 46 through the ultrahigh pressure stop valve 23. The wash water discharged from the high pressure discharge portion 14a to the pipe 41 merges with the wash water from the bypass pipe 46, and then passes through the high pressure regulating valve 21 to flow through the pipe 42. Through the manifold 27 and the pipe 42b, the small hose 3a To be supplied. Since the high pressure regulating valve 21 is set to the first pressure, the pressure of the cleaning water supplied to the small hose 3a is the first pressure. And the high-pressure washing water supplied to the small hose 3a is sprayed from the washing gun 3b.

<Ultra high pressure injection operation>
Next, an ultrahigh pressure injection operation for injecting ultrahigh pressure cleaning water from the cleaning gun 4b of the ultrahigh pressure hose 4a will be described. When the large / small hose reel changeover switch 16 of the operation panel 5 is turned on to the stop side contact, the ultrahigh pressure / high pressure changeover switch 17 is turned on to the ultrahigh pressure injection side contact, and the cutoff valve SW3 is turned on, the ultrahigh pressure is applied as described above. The hydraulic motor 67 of the hose reel 4 can be operated, and the super high pressure hose shut-off valve 30 is opened, so that cleaning water can be discharged from the super high pressure hose 4a. At this time, the large hose cutoff valve 28 and the small hose cutoff valve 29 are closed.

  In the ultra-high pressure injection operation, air is supplied to the ultra-high pressure regulating valve 22 shown in FIG. 4 to be turned on, while the air is not supplied to the high-pressure regulating valve 21 and the ultra-high pressure stop valve 23 and is turned off. It becomes a state. As a result, the ultra-high pressure regulating valve 22 is set to the second pressure, the first port 23a and the third port 23c communicate with each other, and the second port 23b is shut off.

  Thereby, the wash water in the water tank 12 is sucked into the suction portion 14 c of the water pump 14 through the pipe 40. The wash water discharged from the high pressure discharge portion 14 a passes through the high pressure regulating valve 21 and is returned to the water tank 12 through the return pipe 43. On the other hand, the cleaning water discharged from the ultrahigh pressure discharge portion 14 b is supplied to the ultrahigh pressure hose 4 a through the pipe 44. Since the pipe 44 and the ultrahigh pressure regulating valve 22 are communicated with each other through the pipe 47, the pressure of the cleaning water supplied to the ultrahigh pressure hose 4a becomes the second pressure. Then, the ultra-high pressure cleaning water supplied to the ultra-high pressure hose 4a is jetted from the cleaning gun 4b.

  As described above, in this embodiment, in the high-pressure cleaning apparatus having the three injection devices of the cleaning nozzle 2b, the cleaning gun 3b, and the cleaning gun 4b, a standard specification is used without using a special-purpose flow path switching device. An inexpensive high-pressure cleaning device and a high-pressure cleaning vehicle equipped with the same are realized by using the flow path switching valves 63 and 64. In the case where there are four or more injection devices, the fourth and fourth ports c and f of the flow path switching valve 64 should be connected to the configurations of the third flow pipe 74 and the fourth flow pipe 75 or lower. It ’s fine.

  The high-pressure cleaning device of the present invention and the high-pressure cleaning vehicle equipped with the same are useful as devices for cleaning objects to be cleaned such as sewage pipes and drainage pipes, and are particularly suitable as devices having three or more injection devices. is there.

DESCRIPTION OF SYMBOLS 1 High pressure washing car 2 Large hose reel 2a Large hose 2b Cleaning nozzle 3 Small hose reel 3a Small hose 3b Cleaning gun 4 Super high pressure hose reel 4a Ultra high pressure hose 4b Cleaning gun 5 Control panel 6 Turntable 7 Wheel 8 Differential 9 Hydraulic device 10 Chassis 11 Subframe 12 Water tank 13 Pump chamber 14 Water pump 14a High pressure discharge part 14b Super high pressure discharge part 14c Suction part 15 Operation lever 16 Large / small hose reel changeover switch 17 Super high pressure / high pressure changeover switch 20 Water circuit 21 High pressure regulating valve 22 Super high pressure regulator 23 Super high pressure stop valve 24 High pressure emergency safety valve 25 Ultra high pressure emergency safety valve 27 Manifold 28 Large hose cutoff valve 29 Small hose cutoff valve 30 Ultra high pressure hose cutoff valve 60 Oil reservoir 61 Hydraulic pump 62 Control valve 3,64 channel switching valve 65, 66, 67 hydraulic motor 110 ultra high pressure selection display lamp

Claims (4)

A first hose reel on which a first injection device for injecting cleaning water is attached to the tip, and a first hose for guiding the cleaning water to the first injection device is wound around;
A second hose reel on which a second injection device for injecting cleaning water is attached to the tip, and a second hose for guiding the cleaning water to the second injection device is wound around;
A third hose reel, to which a third injection device for injecting cleaning water is attached at the tip, and a third hose for guiding the cleaning water to the third injection device is wound;
An oil reservoir in which hydraulic oil is stored;
A supply path having one end connected to the oil reservoir;
A collection path having one end connected to the oil reservoir;
A hydraulic pump that is provided in the middle of the supply path and pumps hydraulic oil in the oil reservoir;
A direction switching device to which the other end of the supply path and the recovery path is connected;
A first flow path and a second flow path, each having one end connected to the direction switching device;
A first flow path switching device to which the other ends of the first flow path and the second flow path are connected;
A third flow path and a fourth flow path each having one end connected to the first flow path switching device;
A second flow path switching device to which the other ends of the third flow path and the fourth flow path are connected;
A first hydraulic flow path having one end and the other end connected to the first flow path switching device;
A second hydraulic flow path having one end and the other end connected to the second flow path switching device;
A third hydraulic flow path having one end and the other end connected to the second flow path switching device;
A first hydraulic motor provided in the middle of the first hydraulic flow path to drive the first hose reel;
A second hydraulic motor provided in the middle of the second hydraulic flow path and configured to rotate the second hose reel;
A third hydraulic motor that is provided in the middle of the third hydraulic flow path and rotationally drives the third hose reel;
The first flow path switching device includes at least a first state in which the first flow path and the second flow path communicate with each other via the first hydraulic flow path, the first flow path, and the third flow path. A second state in which the second flow passage and the fourth flow passage are in communication with each other and the flow passage can be switched;
The second flow path switching device includes at least a first state in which the third flow path and the fourth flow path are communicated with each other via the second hydraulic flow path, the third flow path, and the fourth flow path. Switchable to a second state in which the flow passage communicates with the third hydraulic flow path;
The direction switching device includes at least a first input state that allows the supply path and the first flow path to communicate with each other and allows the recovery path and the second flow path to communicate with each other, and the supply path and the second flow path. A high-pressure washing apparatus that is switchable between a second on state in which the recovery path and the first flow path are in communication with each other and a cut-off state in which the supply path and the recovery path are in communication with each other.   A first bypass path that bypasses the second hydraulic flow path before and after the second hydraulic motor via a first throttle valve, or a second hydraulic flow path before and after the third hydraulic motor, The high-pressure washing apparatus according to claim 1, comprising either or both of a second bypass path that bypasses through a throttle valve.   3. The high-pressure washing apparatus according to claim 1, wherein a throttle valve is provided in one or both of the middle part of the second hydraulic flow path and the middle part of the third hydraulic flow path.   A high pressure washing vehicle equipped with the high pressure washing apparatus according to any one of claims 1 to 3.

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