JP4757211B2 - High pressure washing vehicle and air flow path switching method for high pressure washing vehicle - Google Patents

Description

  The present invention relates to a high pressure washing vehicle and an air flow path switching method for the high pressure washing vehicle.

Conventionally, high-pressure washing vehicles have been used for washing sewage pipes and the like (for example, see Patent Document 1). In general, a high-pressure washing vehicle includes a tank that stores washing water, a pump that pumps cleaning water, a hose that guides the pumped washing water, and an injection device attached to the tip of the hose. During the work, the object to be cleaned is cleaned by spraying high-pressure cleaning water from the spray device onto the object to be cleaned such as a sewer pipe.
Utility Model Registration No. 2510670

  By the way, it is preferable that the spraying pressure of the cleaning water can be changed depending on the state of contamination of the object to be cleaned. In view of this, a configuration has been proposed in which a pressure control valve is provided between the tank and the injection device so that the injection pressure of the washing water can be changed.

  Some pressure control valves of this type control the pressure of the washing water supplied to the injection device in accordance with the air pressure when air is supplied. In such a pressure control valve, a plurality of regulators and switches such as electromagnetic or pneumatic valves are provided in the air circuit, and the regulator into which air is sent is changed by switching the switches. ing. With such an air circuit, the set pressure (target pressure) of the pressure control valve can be changed according to the supplied air.

  However, in the air circuit having a plurality of regulators as described above, there is a possibility that the switch does not function due to a failure of the switch for switching the regulator and the air cannot be supplied to the pressure control valve. When air is not supplied, the pressure control valve is turned off and does not operate. Therefore, the high-pressure washing vehicle as described above has a problem that it becomes impossible to inject washing water due to a failure of a part of the air circuit. In such a case, since the cleaning operation cannot be performed unless the faulty part is repaired, there has been a problem that the cleaning operation must be performed again.

  This invention is made | formed in view of this point, The place made into the objective is to provide the high-pressure washing vehicle which can perform an emergency washing operation at the time of a failure. Another object of the present invention is to propose an air flow path switching method for a high-pressure washing vehicle that enables an emergency washing operation in the event of a failure.

  A high-pressure washing vehicle according to the present invention includes a tank for storing washing water, a pump for pumping the washing water, a water flow path having one end connected to the discharge side of the pump and an injection device connected to the other end, A pressure control valve that is provided in the middle of the water flow path and controls the pressure of the cleaning water supplied to the injection device according to the pressure of the air when air is supplied, and air that guides the air to the pressure control valve A high-pressure washing vehicle including a circuit, wherein the air circuit is connected to an air tank in which air is stored, an upstream air pipe having one end connected to the air tank, and the other end of the upstream air pipe An air pressure adjusting circuit, a downstream air pipe having one end connected to the pressure control valve, a first regulator that is provided in the downstream air pipe and adjusts the air pressure to a predetermined first air pressure; Provided in the air pressure adjustment circuit A second regulator for adjusting the air pressure to a second air pressure lower than the first air pressure; a bypass pipe having one end connected to a midway portion of the upstream air pipe; and the other end of the downstream air pipe; An air flow path switching mechanism capable of switching between a first state of connecting the air pressure adjusting circuit and a second state of connecting the other end of the bypass pipe and the other end of the downstream air pipe; It is what you have.

  The air circuit of the high pressure washing vehicle has a bypass pipe and an air flow path switching mechanism. Therefore, even if a failure occurs in a part of the air circuit and air no longer flows in the air pressure adjustment circuit, the air flow path switching mechanism is switched to the second state, and the downstream side via the bypass pipe It is possible to guide air to the air piping. Thereby, even if it is at the time of a failure, air will pass at least the 1st regulator. Therefore, according to the high-pressure washing vehicle, it is possible to supply the air of the first air pressure to the pressure control valve even at the time of failure, thereby enabling the washing water to be jetted. .

  The air flow path switching mechanism is preferably a three-way valve.

  As a result, the bypass flow path at the time of failure can be secured by a simple mechanism. In addition, the flow path can be switched by a simple operation at the time of failure.

  An air flow path switching method for a high pressure washing vehicle according to the present invention includes a tank for storing washing water, a pump for pumping the washing water, one end connected to a discharge side of the pump, and an injection device connected to the other end. A water flow path, a pressure control valve that is provided in the middle of the water flow path and controls the pressure of the cleaning water supplied to the injection device according to the pressure of the air when the air is supplied, and the air is stored An air tank in which the stored air is stored, an upstream air pipe having one end connected to the air tank, an air pressure adjusting circuit connected to the other end of the upstream air pipe, and one end connected to the pressure control valve A downstream air pipe, a first regulator provided in the downstream air pipe for adjusting the air pressure to a predetermined first air pressure, and provided in the air pressure adjustment circuit, wherein the air pressure is supplied to the first air. Second air pressure lower than pressure An air flow path of a high-pressure washing vehicle, comprising: a second regulator that adjusts to a first position; and an air circuit that has one end connected to a midway portion of the upstream air pipe and that guides air to the pressure control valve In the switching method, during normal operation, the other end of the downstream air pipe is connected to the air pressure adjustment circuit, and the other end of the bypass pipe is connected to the downstream side when the air pressure adjustment circuit fails. The other end of the air pipe is connected.

  According to the air flow path switching method of the high-pressure washing vehicle, air is led from the upstream air pipe to the downstream air pipe via the bypass pipe even at the time of failure. It passes through and is supplied to the pressure control valve. Therefore, according to the air flow path switching method of the high pressure washing vehicle, it is possible to supply the first air pressure to the pressure control valve even at the time of failure. Therefore, even when there is a failure, the cleaning water can be jetted and an emergency cleaning operation can be performed.

  As described above, according to the present invention, it is possible to provide a high-pressure washing vehicle capable of performing an emergency washing operation in the event of a failure. Further, according to the present invention, it is possible to propose an air flow path switching method for a high-pressure washing vehicle that enables an emergency washing operation in the event of a failure.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 show a high-pressure washing vehicle 1 according to this embodiment. The high-pressure washing vehicle 1 is for washing objects to be washed such as a sewage pipe and a boiler pipe by injecting high-pressure washing water from a washing nozzle 33 (see FIG. 3) or a washing gun 35 (see FIG. 3) described later. It is.

  As shown in FIG. 1, the high-pressure washing vehicle 1 includes a cab 2, a chassis 3, and a subframe 4 provided on the upper side of the chassis 3. In the chassis 3, a traveling engine 46 (see FIG. 3), a power transmission device (not shown), and the like are assembled. In addition, wheels 5 are attached to the chassis 3.

  On the subframe 4, a tank 11 for storing cleaning water, a pump 12 for pumping the cleaning water in the tank 11, a hose 13 and a sub hose 14 for guiding the cleaning water to the vicinity of the object to be cleaned (see FIG. 3) A hose reel 15 around which the hose 13 is wound, and a sub hose reel 16 (see FIG. 2) around which the sub hose 14 is wound.

  As shown in FIG. 1, the tank 11 is installed at the center in the front-rear direction on the subframe 4. A pump storage chamber 21 is installed on the front side of the tank 11. The above-described pump 12 is accommodated in the pump storage chamber 21.

  On the sub-frame 4 on the rear side of the tank 11, a turntable 6 is installed so as to be rotatable around a vertical axis. The hose reel 15 is attached to the turntable 6 via a frame 31.

  The hose reel 15 is supported by the frame 31 and rotates forward and backward around the horizontal axis X1. As will be described later, the hose reel 15 is rotationally driven by a hydraulic motor 41 (see FIG. 3). When the hose reel 15 rotates in the forward direction, the hose 13 (see FIG. 3) is fed out from the hose reel 15. On the other hand, when the hose reel 15 rotates in the reverse direction, the hose 13 is wound around the hose reel 15. As shown in FIG. 3, a cleaning nozzle 33 is detachably attached to the tip of the hose 13.

  As shown in FIG. 1, a controller 51 is fixed to the front surface of the frame 31. By using various switches (not shown) of the controller 51, the hose reel 15 is rotationally driven and the pump 12 is operated.

  As shown in FIG. 2, a sub turn table 7 is installed in the sub frame 4 on the rear side of the tank 11 so as to be rotatable about a vertical axis. The sub hose reel 16 is attached to the sub turn table 7 via a frame 32.

  The sub hose reel 16 is supported by the frame 32 and rotates forward and backward around the horizontal axis X2. As will be described later, the sub hose reel 16 is manually operated. That is, when the handle 34 (see FIG. 3) is rotated, the sub hose reel 16 is also rotated, and the sub hose 14 is fed out or wound up. In the present embodiment, the sub hose 14 has a smaller diameter than the hose 13, and as shown in FIG. 3, a cleaning gun 35 is detachably attached to the tip of the sub hose 14.

  The above is the configuration of the high-pressure washing vehicle 1 according to the present embodiment. Next, the water circuit 23 and the drive system of the high-pressure washing vehicle 1 according to this embodiment will be described with reference to FIG. The water circuit 23 is a circuit that supplies cleaning water from the tank 11 to the cleaning nozzle 33 or the cleaning gun 35.

<< Water circuit 23 of high pressure washing car 1 >>
As shown in FIG. 3, one end of a pipe 61 is connected to the bottom of the tank 11 of the high-pressure washing vehicle 1. The other end of the pipe 61 is connected to the pump 12. The pipe 61 is provided with an on-off valve 80 and a strainer 62 in order from the upstream side to the downstream side.

  A pipe 74 is connected to a midway portion of the pipe 61 downstream of the on-off valve 80 and upstream of the strainer 62. An opening / closing valve 84 is provided at the end of the pipe 74. The piping 74 is for discharging the cleaning water remaining in the tank 11 to the outside after the cleaning is completed.

  One end of a pipe 63 is connected to the discharge side of the pump 12. The pump 12 sucks the cleaning water stored in the tank 11 through the pipe 61 and discharges it to the pipe 63 as high-pressure cleaning water.

  The other end of the pipe 63 is connected to the pressure control valve 64. The pressure control valve 64 is connected to the manifold 69 via a pipe 65. The pressure control valve 64 is also connected to the tank 11 via a pipe 71. The pressure control valve 64 mainly guides the cleaning water in the pipe 63 to the pipe 65, but if the pressure of the flowing cleaning water is higher than a predetermined set pressure (target pressure), a part thereof is guided to the pipe 71. In this way, the pressure of the cleaning water led to the pipe 65 is controlled by the pressure control valve 64 so as to be equal to or lower than a predetermined set pressure. In addition, air is supplied to the pressure control valve 64 from the air tank 20 (see FIG. 5) via an air circuit 24 (see FIG. 5) described later. The pressure control valve 64 is turned on / off depending on whether or not the air is supplied. The pressure control valve 64 is configured such that the set pressure is changed by the pressure of the supplied air.

  The manifold 69 is connected to the sub hose reel 16 via a pipe 68. An opening / closing valve 81 is provided at the end of the pipe 68 on the sub hose reel 16 side. A sub hose 14 is wound around the sub hose reel 16, and as described above, a cleaning gun 35 is detachably attached to the tip of the sub hose 14. With such a configuration, the wash water flowing into the manifold 69 is guided to the pipe 68. Then, by opening the on-off valve 81, the cleaning water is sprayed from the cleaning gun 35 via the sub hose reel 16 and the sub hose 14.

  The manifold 69 is also connected to the manifold 70 via a pipe 66. The manifold 70 is connected to the hose reel 15 via a pipe 67. An open / close valve 82 is provided at the manifold 70 side end of the pipe 67. A hose 13 is wound around the hose reel 15 and, as described above, a cleaning nozzle 33 is detachably attached to the tip of the hose 13. With such a configuration, when the on-off valve 82 is opened, the cleaning water that has flowed into the manifold 70 is guided to the pipe 67 and injected from the cleaning nozzle 33 via the hose reel 15 and the hose 13.

  As described above, the pipe 65, the manifold 69, the pipe 66, the manifold 70, the pipe 67, the hose reel 15, and the hose 13 constitute the water flow path 87 that guides the cleaning water from the pressure control valve 64 to the cleaning nozzle 33. The pipe 65, the manifold 69, the pipe 68, the sub hose reel 16, and the sub hose 14 constitute a water flow path 88 that guides cleaning water from the pressure control valve 64 to the cleaning gun 35.

  Manifold 70 is provided with a pressure gauge 72. The pipe 68 is provided with a pressure gauge 73.

<< Drive system of high pressure washing car 1 >>
The pump 12 is connected to the traveling engine 46 described above via a pulley 42, a V belt 43, a drive shaft 44, and a PTO (power take-off device) 45. With such a configuration, the pump 12 is driven by the traveling engine 46. The drive shaft 44 is connected to the hydraulic pump 47 via the power transmission mechanism 55. Further, the hydraulic pump 47 is also driven by the traveling engine 46.

  The discharge side of the hydraulic pump 47 and the hydraulic motor 41 that rotationally drives the hose reel 15 described above are connected via a pipe 52. A direction switching valve 48 and a flow rate control valve 49 are provided in the middle of the pipe 52 in order from the upstream side. The direction switching valve 48 controls the rotation direction of the hydraulic motor 41. The flow control valve 49 controls the rotational driving speed of the hydraulic motor 41, that is, the feeding speed and winding speed of the hose 13 by the hose reel 15. The discharge side of the hydraulic motor 41 and the oil reservoir 50 are connected via a pipe 53. A direction switching valve 48 is provided in the middle of the pipe 53.

  Next, the air circuit 24 of the high-pressure washing vehicle 1 will be described with reference to FIG.

  The air circuit 24 of the high-pressure washing vehicle 1 includes an air tank 20, a first valve 25, a second valve 26, a first regulator 27, a second regulator 28, and a three-way valve 29. The air circuit 24 appropriately supplies air to the pressure control valve 64.

  In the present embodiment, a case where electromagnetic valves are used as the first valve 25 and the second valve 26 will be described. The first valve 25 includes a first port a, a second port b, and a third port c. When the first valve 25 is in an ON state (energized state), the second port b and the third port c are communicated (FIG. 5). (Refer to Fig. 4). The second valve 26 also includes a first port a, a second port b, and a third port c. When the second valve 26 is in an ON state (energized state), the second port b and the third port c are communicated ( In the OFF state (non-energized state), the first port a and the third port c are communicated (see FIG. 4).

  The three-way valve 29 is a manual type and includes a first port a, a second port b, and a third port c. The three-way valve 29 can be switched between a first state in which the first port a and the second port b are communicated and a second state in which the second port b and the third port c are in communication (see FIG. 7). It is configured.

  One end of an air pipe 91 is connected to the air tank 20. One end of an air pipe 92 and an air pipe 93 is connected to the other end of the air pipe 91. The other end of the air pipe 92 is connected to the second port b of the first valve 25. The other end of the air pipe 93 is connected to the first port a of the first valve 25. A second regulator 28 is provided in the middle of the air pipe 93.

  One end of an air pipe 94 is connected to the third port c of the first valve 25. The other end of the air pipe 94 is connected to the second port b of the second valve 26. One end of an air pipe 95 is connected to the third port c of the second valve 26. The other end of the air pipe 95 is connected to the first port a of the three-way valve 29. One end of an air pipe 96 is connected to the second port b of the three-way valve 29. The other end of the air pipe 96 is connected to the pressure control valve 64. A first regulator 27 is provided in the middle of the air pipe 96. One end of an air pipe 97 is connected to the third port c of the three-way valve 29. The other end of the air pipe 97 is connected to the middle part of the air pipe 91.

  The first regulator 27 discharges part of the air and adjusts the air pressure to the predetermined first air pressure when the air pressure passing through the air pipe 96 is higher than the predetermined first air pressure. It is. On the other hand, when the air pressure passing through the air pipe 93 is higher than the predetermined second air pressure, the second regulator 28 discharges part of the air and adjusts the air pressure to the predetermined second air pressure. It is. The second air pressure is set lower than the first air pressure.

  With such a configuration, an air pressure adjusting circuit 99 is formed by the air pipes 92 to 95 and the first valve 25 and the second valve 26. A second regulator 28 is provided in the middle of the air pipe 93 of the air pressure adjustment circuit 99. Thereby, the air pressure adjusting circuit 99 is configured to be able to adjust the air pressure to a pressure lower than the first air pressure (second air pressure in the present embodiment). When the three-way valve 29 is switched to the second state (see FIG. 7), the second port b and the third port c communicate with each other, whereby the air pipe 97 is connected between the air pipe 91 and the air pipe 96. In FIG. 2, a bypass passage that bypasses the air pressure adjustment circuit 99 is formed.

  The above is the configuration of the air circuit 24. Next, the operation of the high pressure washing vehicle 1 will be described. The high-pressure washing vehicle 1 can selectively execute a high-pressure injection operation for injecting high-pressure washing water from the washing nozzle 33 and a low-pressure injection operation for injecting low-pressure washing water from the washing gun 35. The high-pressure injection operation is suitable for, for example, high-pressure cleaning of dirt in the manhole. The low-pressure injection operation is suitable, for example, when washing around the manhole.

《High pressure injection operation》
First, a high-pressure injection operation for injecting high-pressure cleaning water from the cleaning nozzle 33 will be described with reference to FIGS. 3 and 5. In the high pressure injection operation, the open / close valve 82 on the hose 13 side is opened, and the open / close valve 81 on the sub hose 14 side is closed.

  As shown in FIG. 5, in the air circuit 24, the first valve 25 and the second valve 26 are set to the ON state. Further, the three-way valve 29 is manually set to the first state. Accordingly, air is supplied from the air tank 20 to the pressure control valve 64 through the air pipes 91 and 92, the first valve 25, the air pipe 94, the second valve 26, the air pipe 95, the three-way valve 29, and the air pipe 96. The At that time, it passes through the first regulator 27 provided in the middle of the air pipe 96. Therefore, the air having the first air pressure adjusted by the first regulator 27 is supplied to the pressure control valve 64. Thereby, the set pressure of the pressure control valve 64 is set to the first pressure (predetermined high pressure value, for example, 20 MPa).

  In the water circuit 23, the cleaning water in the tank 11 is sucked into the pump 12 through the pipe 61. Then, the washing water discharged from the pump 12 passes through the pressure control valve 64 and flows through the water flow path 87. Since the set pressure of the pressure control valve 64 is set to the first pressure, the pressure of the wash water flowing through the water flow path 87 becomes the high first pressure. Then, the high-pressure washing water that has flowed through the water flow path 87 is jetted from the washing nozzle 33.

《Low-pressure injection operation》
Next, a low pressure injection operation for injecting low pressure cleaning water from the cleaning gun 35 will be described with reference to FIGS. 3 and 6. In the low pressure injection operation, the open / close valve 82 on the hose 13 side is closed, and the open / close valve 81 on the sub hose 14 side is opened.

  As shown in FIG. 6, in the air circuit 24, the first valve 25 is set to the OFF state and the second valve 26 is set to the ON state. Further, the three-way valve 29 is manually set to the first state. Thus, air is supplied from the air tank 20 to the pressure control valve 64 through the air pipes 91 and 93, the first valve 25, the air pipe 94, the second valve 26, the air pipe 95, the three-way valve 29, and the air pipe 96. The At that time, it passes through the second regulator 28 provided in the middle of the air pipe 93 and the first regulator 27 provided in the middle of the air pipe 96. The adjustment pressure of the second regulator 28 that passes first is set lower than the adjustment pressure of the first regulator 27. Therefore, the air of the second air pressure adjusted by the second regulator 28 is supplied to the pressure control valve 64. Thereby, the set pressure of the pressure control valve 64 is set to the second pressure (for example, when the first pressure is 20 MPa, an arbitrary pressure lower than that).

  In the present embodiment, the second regulator 28 is formed such that the adjustment pressure can be changed within a range not exceeding the adjustment pressure of the first regulator 27. For this reason, the second regulator 28 can change the adjustment pressure according to the operating condition, and the second pressure fluctuates accordingly.

  In the water circuit 23, the cleaning water in the tank 11 is sucked into the pump 12 through the pipe 61. Then, the washing water discharged from the pump 12 passes through the pressure control valve 64 and flows into the water flow path 88. Since the set pressure of the pressure control valve 64 is set to the second pressure, the pressure of the wash water flowing through the water flow path 88 becomes the low second pressure. Then, the low-pressure washing water that has flowed through the water flow path 88 is jetted from the washing gun 35.

<Emergency emergency operation>
Next, an emergency emergency operation that is performed when air cannot be supplied to the pressure control valve 64 due to a failure of the air circuit 24 will be described with reference to FIG. For example, when the first valve 25 and the second valve 26 cannot be turned on due to failure of the first valve 25 and the second valve 26 or disconnection of a harness connected thereto, the pressure control is performed. Air cannot be supplied to the valve 64. Emergency operation is performed in such a case. The emergency emergency operation is the same as the high-pressure injection operation in which high-pressure cleaning water is injected from the cleaning nozzle 33 with respect to the movement of the cleaning water in the water circuit 23. Therefore, the on-off valve 82 on the hose 13 side is released, and the on-off valve 81 on the sub hose 14 side is closed. Hereinafter, the movement of air flowing in the air circuit 24 different from the high pressure injection operation will be described.

  As shown in FIG. 7, in the air circuit 24, the first valve 25 and the second valve 26 are in an OFF state due to a failure. At this time, the three-way valve 29 is manually switched from the first state to the second state. Thereby, the connection state between the air pipe 95 and the air pipe 96 is released, and the air pipe 96 is connected so as to be able to communicate with the air pipe 97. Therefore, the air stored in the air tank 20 passes through the air pipes 91 and 97, the three-way valve 29, and the air pipe 96 and is supplied to the pressure control valve 64. At that time, since the air passes through the first regulator 27, the air of the first air pressure adjusted by the first regulator 27 is supplied to the pressure control valve 64. Thereby, the set pressure of the pressure control valve 64 is set to the first pressure (predetermined high pressure value, for example, 20 MPa).

  As described above, in the present high-pressure washing vehicle 1, during normal operation, the air pipe 96 and the air pressure adjustment circuit 99 are connected, and, for example, the air pressure is adjusted due to the failure of the first valve 25 and the second valve 26 or the like. When the air stops flowing in the circuit 99, an air flow path switching method is adopted in which the air pipe 97 and the air pipe 96 are connected to enable emergency operation in an abnormal state.

  As described above, the air circuit 24 of the high pressure washing vehicle 1 includes the air pipe 97 and the three-way valve 29. Therefore, even if a failure occurs in a part of the air circuit 24, for example, the first valve 25 and the second valve 26, and the air does not flow into the air pressure adjustment circuit 99, the three-way valve 29 is in the second state. By switching to, air can be guided to the air pipe 96 via the air pipe 97. Thereby, even if it is at the time of failure, air will pass at least the 1st regulator 27. Therefore, according to the high pressure washing vehicle 1, it is possible to supply the air of the first air pressure to the pressure control valve 64 even at the time of failure. Therefore, even when there is a failure, the cleaning water can be jetted and an emergency cleaning operation can be performed.

  Further, the high pressure washing vehicle 1 is configured to be switched between the first state and the second state by the three-way valve 29. Thereby, a bypass flow path at the time of failure can be secured by a simple mechanism. In addition, the flow path can be switched by a simple operation at the time of failure.

  In the air flow path switching method of the high-pressure washing vehicle 1, the air pipe 96 and the air pressure adjustment circuit 99 are connected during normal operation. For example, the air pressure due to the failure of the first valve 25 and the second valve 26 or the like. When air stops flowing in the adjustment circuit 99, the air pipe 97 and the air pipe 96 are connected to enable emergency operation in an abnormal state. According to the air flow path switching method of the high-pressure washing vehicle 1, air is guided from the air pipe 91 to the air pipe 96 through the air pipe 97 even at the time of failure, so that the air is at least the first regulator 27. And the pressure control valve 64 is supplied. Therefore, according to the air flow path switching method of the high-pressure washing vehicle 1, it is possible to supply the first air pressure to the pressure control valve 64 even at the time of failure. Therefore, even when there is a failure, the cleaning water can be jetted and an emergency cleaning operation can be performed.

  In the present embodiment, the first valve 25 and the second valve are described as electromagnetic valves, but the same effect can be obtained even if the first valve 25 and the second valve 26 are pneumatic valves. it can.

  In the present embodiment, the cleaning nozzle 33 and the cleaning gun 35 are used as the cleaning water injection device. However, the injection device is not limited to these, and other injection devices may be used.

  Furthermore, in the present embodiment, the three-way valve 29 is used as the air flow path switching mechanism. However, in addition to the three-way valve 29, any switching mechanism that can switch between the first state and the second state described above. It may be used.

  As described above, the present invention is useful for the high pressure washing vehicle and the air flow path switching method of the high pressure washing vehicle.

It is a side view of a high-pressure washing vehicle. It is a rear view of a high-pressure washing car. It is a figure which shows a water circuit and a drive system. It is a circuit diagram of an air circuit. It is an air circuit diagram which shows the flow of the air in a high pressure injection driving | operation. It is an air circuit diagram which shows the flow of the air in a low pressure injection driving | operation. It is an air circuit diagram which shows the flow of the air in emergency operation at the time of abnormality.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High pressure washing car 11 Tank 12 Pump 20 Air tank 23 Water circuit 24 Air circuit 25 1st valve 26 2nd valve 27 1st regulator 28 2nd regulator 29 Three-way valve (air flow path switching mechanism)
33 Cleaning nozzle (jetting device)
35 Cleaning gun (injection device)
64 Pressure control valve 87 Water flow path 88 Water flow path 91 Air piping (upstream air piping)
92 Air piping 93 Air piping 94 Air piping 95 Air piping 96 Air piping (Downstream air piping)
97 Air piping (bypass pipe)
99 Air pressure adjustment circuit

Claims (3)

A tank for storing cleaning water, a pump for pumping the cleaning water, a water channel having one end connected to the discharge side of the pump and an injection device connected to the other end, and a middle part of the water channel. A high-pressure washing vehicle comprising: a pressure control valve that controls the pressure of washing water supplied to the injection device according to the pressure of air when air is supplied; and an air circuit that guides air to the pressure control valve Because
The air circuit is
An air tank in which air is stored;
Upstream air piping with one end connected to the air tank;
An air pressure adjusting circuit connected to the other end of the upstream air pipe;
A downstream air pipe having one end connected to the pressure control valve;
A first regulator that is provided in the downstream air pipe and adjusts the air pressure to a predetermined first air pressure;
A second regulator provided in the air pressure adjustment circuit for adjusting the air pressure to a second air pressure lower than the first air pressure;
A bypass pipe having one end connected to a midway part of the upstream air pipe;
Switching between a first state in which the other end of the downstream air pipe and the air pressure adjustment circuit are connected and a second state in which the other end of the bypass pipe and the other end of the downstream air pipe are connected. An air flow path switching mechanism,
Having high pressure washing car. The high-pressure washing vehicle according to claim 1,
The air flow path switching mechanism is a high-pressure washing vehicle that is a three-way valve. A tank for storing wash water;
A pump for pumping the wash water;
A water flow path having one end connected to the discharge side of the pump and an injection device connected to the other end;
A pressure control valve that is provided in the middle of the water flow path and controls the pressure of the washing water supplied to the injection device according to the pressure of the air when air is supplied;
An air tank in which air is stored, an upstream air pipe having one end connected to the air tank, an air pressure adjustment circuit connected to the other end of the upstream air pipe, and one end being the pressure control A downstream air pipe connected to the valve; a first regulator provided in the downstream air pipe for adjusting the air pressure to a predetermined first air pressure; and provided in the air pressure adjustment circuit; An air circuit having a second regulator for adjusting to a second air pressure lower than the first air pressure, and a bypass pipe having one end connected to a midway portion of the upstream air pipe, and leading the air to the pressure control valve When,
An air flow path switching method for a high-pressure washing vehicle comprising:
During normal operation, connect the other end of the downstream air pipe and the air pressure adjustment circuit,
An air flow path switching method for a high-pressure washing vehicle, wherein the other end of the bypass pipe and the other end of the downstream air pipe are connected when the air pressure adjustment circuit fails.

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