JP7402067B2 - water sprinkler truck - Google Patents

Description

The present invention relates to a water sprinkler vehicle that stores water moved from a water source in a tank mounted on a vehicle body, and discharges water by discharging the retained water from the tank.

An example of a water sprinkler vehicle is one shown in Patent Document 1. In the water supply pump device included in this water truck, when the push button switch is pressed after driving the pump, the relay is activated and the port of the valve is switched, and water is sucked from the water source into the pump and loaded into the tank. The water supply pump device is equipped with a full water sensor, and when the full water sensor detects the water, the pump stops driving and water supply to the tank is completed.

The full water sensor in the water supply pump device described in Patent Document 1 detects the water level in order to stop the drive related to suction of the pump. Therefore, even if the tank is full of water, when the push button switch is pressed, the pump stops driving when the full water sensor detects the above series of operations.

In this way, when the push button switch is pressed, the loading operation is always performed, so even if the tank is full of water, the water truck will not be near the water source until the operation is completed. The system had to remain in a stopped state, resulting in wasted time.

JP2008-7994A (paragraphs 0012-0014, Figure 5)

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a water sprinkler truck that suppresses wasted time when loading water into a tank.

The water sprinkler truck of the present invention includes a tank mounted on a vehicle body and holding water inside, a water suction pipe connected to the tank and having a water suction valve that can be opened and closed, and connected to the water suction pipe, the water suction pipe A pump that performs a water suction operation to send water to the tank through the pump, a water suction operation switch that is operated when the pump performs the water suction operation, a water amount sensor that detects the amount of water held in the tank, and a control unit. , the control unit is configured to disable the water absorption operation when the water absorption operation switch is operated and the amount of retained water detected by the water amount sensor is equal to or greater than a set unnecessary amount of water absorption. It is characterized by

According to the above configuration, it is possible to prevent a series of operations related to water absorption from being performed even though the amount of water held in the tank is greater than the amount of water absorption that does not require water absorption, thereby improving the work efficiency of the water sprinkler truck. can.

Further, when not performing the water suction operation, the control section can close the water suction valve in addition to not causing the pump to perform the water suction operation.

According to this configuration, when the water suction operation switch is operated, the water suction operation of the pump is not performed, so that the water suction operation can be immediately stopped.

Also, a priming tank that holds water other than the water in the tank or a part of the water in the tank, and a priming tank that automatically moves the water held by the priming tank to the water suction pipe. further comprising an automatic priming switch that is operated when the automatic priming switch is operated, and when the amount of retained water detected by the water amount sensor is When the amount of water absorption is less than the set unnecessary amount, water from the priming tank can be sent to the water suction pipe, and then the pump can be operated to perform the water suction operation.

According to this configuration, it is possible to prevent the pump from idling due to the absence of water in the water suction pipe.

INDUSTRIAL APPLICATION This invention can improve the working efficiency of a water sprinkler truck. Therefore, it is possible to provide a water sprinkler truck that suppresses wastage of time when loading water into a tank.

1 is an overall side view of a water sprinkler according to an embodiment of the present invention. It is a piping diagram to a tank in the said water truck. It is a block diagram showing the control structure of the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when performing automatic priming in the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when performing automatic priming in the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when performing automatic priming in the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when performing automatic priming in the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when water is sucked into a tank in the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when water is sucked into a tank in the water sprinkler vehicle. FIG. 3 is an explanatory diagram showing an operating state when water is sucked into a tank in the water sprinkler vehicle.

Hereinafter, a water sprinkler 1 according to an embodiment of the present invention will be described based on FIG. 1. The water sprinkler truck 1 is equipped with a driver's cab 3 in which an engine 2, which is a driving source for driving, is mounted at the bottom, and a frame 4, and is long in the front and rear direction to hold water for water discharging. A tank 5, a switching valve 9 (four-way valve in this embodiment, see FIG. 2) for changing the flow path so as to discharge water in the tank 5 or draw water into the tank 5, and a switching valve 9 (four-way valve in this embodiment, see FIG. 2). 9 for pumping water under pressure, and a front water discharging nozzle 7 and a rear water discharging nozzle 8 for discharging water under pressure through piping when the pump 6 is driven. The pump 6 is driven by the power of the engine 2 being transmitted via a PTO (power takeoff mechanism).

As shown in FIG. 2, the tank 5 includes a priming chamber 10 serving as a priming tank for storing priming water. The priming chamber 10 of this embodiment is provided inside the tank 5, and the upper part of the priming chamber 10 is open. Therefore, the priming chamber 10 retains a portion of the water in the tank. In addition, the priming chamber 10 can also be provided separately from the tank 5. In this case, the priming chamber 10 holds water different from the water in the tank 5. The tank 5 also includes a full water sensor 11A that detects a full water state as a water amount sensor 11 that detects the amount of water held. The full water sensor 11A is provided, for example, in the upper part of the tank 5, but it can also be provided in other parts. The priming chamber 10 is located at the bottom of the tank 5 in front of the water sprinkler. In addition, the priming chamber 10 is connected to a fourth flow path R4, which will be described later, and a discharge port 5A, which will be described later, formed in the tank 5 is connected to a fifth flow path R5, which is different from the fourth flow path R4, which will be described later. Even if all the water in the tank 5 is used up, the water in the priming chamber 10 remains without being drained. Furthermore, by filling the pipe with water from the priming chamber 10, air in the pipe is removed. This allows water to flow quickly. In addition, the tank 5 provided with the priming chamber 10 as in the present embodiment is used as a water amount sensor 11 that detects the amount of water held, so that the amount of water in the priming chamber 10 (for example, the amount of water in the priming chamber 10 can supply priming water to the water suction piping). A priming sensor 11B is provided separately from the full water sensor 11A. That is, in this embodiment, a plurality (two) of water amount sensors 11 with different detection targets are provided. Although the priming sensor 11B is provided, for example, inside the priming chamber 10, it can also be provided in other parts. The fourth flow path R4 and the fifth flow path R5 constitute a first flow path R1 for discharging the liquid in the tank 5 or sucking the liquid into the tank 5.

Further, a discharge port 5A is formed at the bottom of the tank 5 to discharge the water in the tank 5 downward from the front bottom of the tank 5, and one end of the first tank pipe 12 is connected to the discharge port 5A. ing. Also, one end of the priming pipe 13 is connected to a priming port 5B formed at the bottom of the priming chamber 10 provided in the tank 5, and the other end of the priming pipe 13 is connected to the first tank pipe 12 on the downstream side. It is connected to the. The first tank pipe 12 is provided with a tank valve 14 that can be opened and closed, and the priming pipe 13 is provided with a priming valve 15 that can be opened and closed. One end of the merging pipe 16 is connected to the merging part of the first tank piping 12 and the priming water piping 13, and the other end (downstream end) of the merging pipe 16 is connected to one mouth (port) 9A of the switching valve 9. It is connected to the. As described above, the lower end (downstream end) of the first tank pipe 12 and the lower end (downstream end) of the priming water pipe 13 are joined by one merging pipe 16 .

Further, a second tank pipe 17 for discharging water in the tank 5 downward from the rear bottom of the tank 5 is connected. The second tank piping 17 is provided with a rear water discharge valve 18 that can be opened and closed. Further, two branch pipes 19 and 20 are connected to the downstream end of the second tank pipe 17, and each of the branch pipes 19 and 20 is provided with a manually operated valve 21. Rear water discharge nozzles 8, 8 are connected to the downstream ends of 21, 21.

The switching valve 9 includes a valve body (not shown) having four ports 9A, 9B, 9C, and 9D, and a valve body (not shown) rotatably disposed inside the valve body. It consists of a general-purpose four-way valve. The four ports 9A, 9B, 9C, and 9D provided on the valve body serve as a priming port 5B for discharging water in the priming chamber 10 or sucking water into the tank 5 by sucking water into the priming chamber 10. A first port 9A is connected to a discharge port 5A for discharging water from the tank 5, and a second port 9B is connected to a suction port of the pump 6 via a piping 6A. A third port 9C connected via piping 6B to a discharge port for discharging water from the tank 5 serves as a discharge port for discharging water from the tank 5 and a suction port for supplying water from a water storage tank 31, which will be described later. This is the fourth opening 9D. A relief valve 22 is provided in the flow path on the side where the fluid is fed under pressure from the pump 6 .

A pipe 23 connected to the fourth port 9D is branched into two branch pipes 24 and 25 at the downstream end. One of the branch pipes 24 is provided with a front water discharge valve 26, and two branch pipes 27 and 28 are connected to the downstream end of the one branch pipe 24, respectively. A manually operated valve 29 is provided, and front water discharge nozzles 7, 7 are connected to the downstream ends of the manually operated valves 29, 29. The other branch pipe 25 is provided with a water intake valve 30, and the downstream end of the other branch pipe 25 is provided with a strainer 32 that is introduced into water W in a water storage tank 31 as a water source. The water source is not limited to the water tank 31, but may be a pond, a river, or another container or tank that can store water. Further, a water discharge pipe 33 is branched and connected to the middle of the pipe 23 connected to the fourth port 9D. The water discharge pipe 33 is provided with a water discharge valve 35 that can open and close the water discharge port 34 by manual operation.

The fifth flow path R5 is a flow path formed by the first tank pipe 12 and the confluence pipe 16 between the bottom of the tank 5 and the first port 9A of the switching valve 9. Further, the fourth flow path R4 is a flow path formed between the bottom of the priming chamber 10 of the tank 5 and the first port 9A of the switching valve 9 by the priming pipe 13 and the merging pipe 16. In addition, a second flow path R2 is formed between the branch pipes 27, 28 and the fourth port 9D of the switching valve 9 by the pipe (merging pipe where the branch pipes 24, 25 join together) 23 and one pipe 24. be done. Further, a third flow path R3 is formed between the strainer 32 and the fourth port 9D of the switching valve 9 by the pipe 23 and the other pipe 25.

The tank 5 is connected to a water intake pipe for filling water and a water discharge pipe for discharging water. In this embodiment, one system of water suction piping and water discharge piping is used for both input and output in the section from the tank 5 to the middle. Specifically, the first tank piping 12, the priming piping 13, the merging piping 16, and the piping (merging piping) 23 have a series of flow paths. The branch pipe 25, which constitutes a part of the water absorption pipe, is composed of a fixed pipe 251 fixedly provided on the water sprinkler 1, and a water absorption hose 252 connected to the upstream end of the fixed pipe 251 when water is absorbed. (See Figure 2). The water absorption hose 252 is pulled out from the water sprinkler 1 when performing a water absorption operation to send water to the tank 5, and its tip is put into a water source such as the water storage tank 31. The water absorption hose 252 is, for example, wrapped around the vehicle body of the water sprinkler 1 when the water sprinkler 1 is running. The water intake valve 30, which can be opened and closed, is provided in the water intake pipe. The pump 6 is connected to water suction piping (merging piping 16 and piping 23), and sucks water through the water suction piping (specifically, the first tank piping 12, priming piping 13, merging piping 16, piping 23, and branch piping 25). The discharge operation (drainage operation related to water discharge from the front water discharge nozzle 7) )I do. The water truck 1 is provided with a suction button 40 as a water suction operation switch, which is operated by an operator when causing the pump 6 to perform the water suction operation. In this embodiment, the intake button 40 is provided in an operation box 41 provided on the side of the vehicle body.

The water truck 1 also includes a control section S that controls various devices included in the water truck 1. The control unit S of this embodiment particularly controls water absorption. Regarding the water suction operation switch, the control unit S performs the water suction operation when the suction button 40 is operated and the amount of water held in the tank 5 detected by the water amount sensor 11 is equal to or greater than the set unnecessary amount of water absorption. will not be implemented. The unnecessary amount of water absorption can be arbitrarily set to a water amount close to full water. The water amount sensor 11 that detects the unnecessary amount of water absorption transmits a detection signal to the control unit S when it detects that the amount of water in the tank 5 is equal to or greater than the unnecessary amount of water absorption. In this embodiment, the water amount sensor 11 is a full water sensor 11A, and the amount of water when the tank 5 is full is set to the amount of water related to detection. When the full water sensor 11A detects that the tank 5 is full of water, it transmits a full water signal to the control unit S.

Due to the above control, a series of operations related to water absorption (execution of a series of control flows) even though the amount of water held in the tank 5 is equal to or greater than the unnecessary amount of water absorption that does not require water absorption (the amount of water in a full state in this embodiment). Since it is possible to suppress the waste of time, it is possible to improve the work efficiency of the water sprinkler truck.

Further, when not performing the water suction operation, the control unit S operates to disable the pump 6 from performing the water suction operation of sending water to the tank 5 through the water suction pipe using the switching valve 9, and to close the water suction valve 30. . With this control, when the suction button 40 is operated, the water suction operation of the pump 6 is not performed, so that the water suction operation can be immediately stopped.

Note that the control unit S may connect and disconnect the PTO. In this case, when the intake button 40 is operated, the pump 6 is normally not connected to the engine (not driven), so the control unit S connects the PTO (drives the pump 6). Maintain a non-driving state without any problems. In this way, it is possible to prevent waste of time by preventing a series of operations related to water absorption from being performed.

On the other hand, the water truck 1 has a priming button as an automatic priming switch that is operated by an operator when automatically moving the water held in the priming chamber 10 to the water suction pipe (automatic priming). 39 are provided. In this embodiment, the priming button 39 is provided in an operation box 41 provided on the side of the vehicle body.

Regarding the automatic priming switch (priming button 39), the control unit S determines whether the automatic priming switch is operated and the amount of retained water detected by the full water sensor 11A is less than the set unnecessary amount of water absorption. First, a priming operation is automatically performed to send water from the priming chamber 10 to the water suction pipe, and then the pump 6 is driven to perform the water suction operation. This control can prevent the pump 6 from running idly due to the absence of water (air in the water suction pipe).

Next, regarding the operation of the water sprinkler 1 of this embodiment, a priming operation and a water absorption operation will be described. Note that explanations regarding other operations such as water spraying will be omitted. FIG. 3 is a block diagram showing the control configuration of the present invention. The control unit S includes an ON-OFF signal from the priming button 39, an ON-OFF signal from the suction button 40, and a full-water signal from the full-water sensor 11A. Opening and closing operations of the on-off valves 26, 30, 15, 14, and 18, driving and stopping operations of the pump 6, and switching operations of the switching valve 9 are performed.

The priming button 39 is a push button for causing water from the priming chamber 10 to flow from the fourth flow path R4 to the third flow path R3. The suction button 40 is a push button for starting suction of water into the tank 5. In this embodiment, the buttons 39 and 40 have been described as push buttons, but they can also be switches having various configurations.

A description will be given of how the control unit S automatically drives and controls the on-off valves 26, 30, 15, 14, and 18 and the switching valve 9 by the operator operating the push button (switch) described above. First, the engine and pump 6 are connected by operating a PTO switch (not shown) in the driver's seat, and the pump 6 is started.

[Priming operation]
When the priming button 39 is turned on, it is determined that the control unit S has not received the signal (full water signal) from the full water sensor 11A (that is, when the amount of retained water detected by the full water sensor 11A is less than the set unnecessary water absorption amount). , and on the condition that the control unit S receives a signal (priming possible signal) from the priming sensor 11B that is transmitted when the amount of water held in the priming chamber 10 is equal to or higher than a predetermined amount and priming can be supplied. , the control unit S closes three valves, the tank valve 14, the front water discharge valve 26, and the rear water discharge valve 18 (see FIG. 4A), and then opens the priming valve 15 in the closed state and the water intake valve 30 in the closed state. , the switching valve 9 is switched so that the fourth flow path R4 and the third flow path R3 communicate with each other (see FIG. 4B). Note that the control unit S initially receives the priming enable signal from the priming sensor 11B, but if it stops receiving it midway (when the water in the priming chamber 10 runs out while being supplied), the signal at that point The automatic control of priming will be interrupted. By switching in this manner, even if all the ports 9A to 9D communicate with each other when switching the switching valve 9, water can be prevented from leaking from the front water discharge nozzle 7. In addition, it is more preferable to switch the switching valve 9 before opening the priming valve 15 in the closed state and the water intake valve 30 in the closed state. Furthermore, since the rear water discharge valve 18 is closed, water can be prevented from leaking from the rear water discharge nozzle 8. In this state, the priming water flows from the priming chamber 10 to the fourth flow path R4, and then flows to the third flow path R3 through the switching valve 9 (see FIG. 4C). As a result, by filling the water in the priming chamber 10 into the four pipes 13, 16, 23, and 25, the air in the four pipes 13, 16, 23, and 25 is vented, and the water can flow quickly. That's what I do.

The control unit S waits until a predetermined period of time has elapsed from the opening of the priming valve 15 and the water intake valve 30 and the completion of switching the switching valve 9, and then draws the priming water toward the pump 6 (by connecting the fourth port 9D to the second opening). The switching valve 9 is switched so that the third port communicates with the first port 9B and the third port communicates with the first port 9A, respectively. By driving the pump 6, the front pipes 13, 16, 6A, 6B, 23, and 25 are filled with water (see FIG. 4D). By continuing to drive the pump 6, water from the water tank 31 passes through the third flow path R3, the switching valve 9, the pump 6, the fourth flow path R4, and enters the tank 5 via the priming chamber 10. water is inhaled (see Figure 5C). When the control unit S receives a full water signal from the full water sensor 11A by sucking water into the tank 5, it shifts to a stop operation (described later).

After the predetermined time (for example, 20 seconds) has elapsed as described above, the control unit S determines that the four pipes 13, 16, 23, and 25 are filled with water. On the other hand, if the control unit S receives a full water signal from the full water sensor 11A when the priming button 39 is turned on, the above priming controls the filling of water into the water suction pipe and the intake of water into the tank 5. Not done.

[Water absorption operation]
Next, when the suction button 40 is pressed, a suction command signal for sucking water into the tank 5 is output. When the control unit S receives this suction command signal, on the condition that the control unit S does not receive a signal (full water signal) from the full water sensor 11A, the tank valve 14, the front water discharge valve 26 After closing the rear water discharge valve 18 (see FIG. 5A), the priming valve 15 in the closed state and the water intake valve 30 in the closed state are opened, and the fourth flow path R4 and the third flow path R3 are connected to the pump 6. The switching valve 9 is switched so that the fourth port 9D communicates with the second port 9B, and the third port 9C communicates with the first port 9A (see FIG. 5B). By switching in this manner, even if all the ports 9A to 9D communicate with each other when switching the switching valve 9, water can be prevented from leaking from the front water discharge nozzle 7. In addition, it is more preferable to switch the switching valve 9 before opening the priming valve 15 in the closed state and the water intake valve 30 in the closed state. Furthermore, since the rear water discharge valve 18 is closed, water can be prevented from leaking from the rear water discharge nozzle 8. When the switching of the switching valve 9 is completed, water from the water tank 31 is driven to the priming chamber 10 by driving the pump 6 through the third flow path R3, the switching valve 9, the pump 6, and the fourth flow path R4. Water is drawn into the tank 5 through the tank 5 (see FIG. 5C). When the control unit S receives a full water signal from the full water sensor 11A by sucking water into the tank 5, it shifts to a stop operation. On the other hand, if the control section S receives the full water signal from the full water sensor 11A when the control section S receives the inhalation command signal, the above-mentioned inhalation control is not performed.

[Stopping operation]
When the inhalation is completed, the control section S shifts to a stop operation. Specifically, the control unit S closes and operates all the valves, namely, the tank valve 14, the priming valve 15, the front water discharge valve 26, the water intake valve 30, and the rear water discharge valve 18. After this, the switching valve 9 is switched to the stop position, and the stop operation is completed. Also in this case, since all the valves (tank valve 14, priming valve 15, front water discharge valve 26, water intake valve 30, rear water discharge valve 18) are closed, when switching the switching valve 9, all ports 9A to 9D are closed. Even if there is communication, water can be prevented from flowing out from an unintended location during switching.

Note that a stop button may be further provided, and the stop operation may be executed when the stop button is operated from preparation for inhalation to before detection by the full water sensor 11A. The control unit S opens and closes the front water discharge valve 26 using the front operation switch 37 after the priming button 39 is turned ON or after receiving the suction command signal until the switching valve 9 is completely switched to the stop position. If the configuration is such that the operation is ignored, the front water discharge valve 26 is opened and the liquid sucked into the tank 5 is guided to the discharge part (front water discharge nozzle 7) through the second flow path R2 (see FIG. 2). It can prevent leakage to the outside.

The water sprinkler 1 according to an embodiment of the present invention has been described above, but the present invention can be modified in various ways without departing from the spirit thereof. In addition, the specific configuration of each part is not limited to the above embodiment.

For example, when the priming button 39 is turned on, the control unit S determines whether to start, not to start, or to interrupt the priming operation (interruption in the middle of control) based on two signals from the full water sensor 11A and the priming sensor 11B. , the determination may be made based only on the signal from the full water sensor 11A. In this case, for example, when the priming button 39 is turned on, if the control unit S does not receive the full water signal from the full water sensor 11A, the control unit S switches the valves (sending out priming water from the priming chamber 10 and switching on the water source). (absorption of water W) is executed, and if the control unit S receives a full water signal from the full water sensor 11A, no operation is performed. Furthermore, in both cases, when the priming button 39 is turned on (for priming operation) and when the suction button 40 is turned on (for water suction operation), the control unit S operates based on the signal from the full water sensor 11A. Although the start, non-start, or interruption (interruption during control) has been determined, the control unit S may make the determination only in one of the cases. Moreover, the priming sensor 11B itself may not be provided.

Further, in the above embodiment, the pump 6 is driven by the output of the engine 2 which is the driving source for driving, but the pump 6 may be driven by an engine or an electric motor other than the engine 2 which is the driving source for driving. .

Further, in the above embodiment, the spiral pump 6 is used as a mechanism for discharging the liquid in the tank 5 or sucking the liquid into the tank 5, but various types such as a diaphragm type, gear type, vane type, etc. It may also be a pump.

Further, in the embodiment described above, the piping is used for both water absorption and water discharge, but the tank 5 may be provided with piping dedicated to water absorption and water discharge, respectively.

Further, in the embodiment, a four-way valve is used as the switching valve 9, but a three-way valve, a five-way valve or more may be used.

1... Water truck, 2... Engine, 3... Cab, 4... Frame, 5... Tank, 5A... Discharge port, 5B... Priming port, 6... Pump, 6A, 6B... Piping, 7... Front water nozzle, 8... Rear water discharge nozzle, 9...Switching valve (4-way valve), 9A...1st port, 9B...2nd port, 9C...3rd port, 9D...4th port, 10...priming tank (priming chamber) ), 11... Water amount sensor, 11A... Full water sensor, 11B... Priming sensor, 12... Water absorption piping (first tank piping), 13... Water absorption piping (priming piping), 14... Tank valve, 15... Priming valve, 16... Water absorption Piping (merging piping), 17... Second tank piping, 18... Rear water discharge valve, 19, 20... Branch piping, 21... Manual operation valve, 22... Relief valve, 23... Water intake piping (piping, merging piping), 24... Branch piping, 25... Water suction piping (branch piping), 26... Front water discharge valve, 27, 28... Branch piping, 29... Manually operated valve, 30... Water suction valve, 31... Water tank, 32... Strainer, 33... Water discharge piping, 34... Water discharge port, 35... Water discharge valve, 36... Water discharge button, 37... Front side operation switch, 38... Rear side operation switch, 39... Automatic priming switch (priming button), 40... Water suction operation switch (suction button) , 41... Operation box, 251... Fixed piping, 252... Water absorption hose, R1... First channel, R2... Second channel, R3... Third channel, R4... Fourth channel, R5... Fifth flow path, S...control unit, W...water in the water tank

Claims (3)

A tank that is mounted on the vehicle body and holds water inside,
a water intake pipe connected to the tank and having a water intake valve that can be opened and closed;
a pump that is connected to the water suction pipe and performs a water suction operation that supplies water in the tank to the water suction pipe and then sends water to the tank through the water suction pipe;
a water suction operation switch that outputs a suction command signal for sucking water into the tank by being operated when the pump performs the water suction operation;
a water amount sensor that detects the amount of water held in the tank;
comprising a control unit;
When the control unit receives the suction command signal in response to the operation of the water suction operation switch, and the water suction is not required, the amount of retained water detected by the water amount sensor at the time of the reception is set. A water sprinkler truck characterized in that the water absorption operation is not carried out when the amount exceeds the water absorption amount. The water sprinkler truck according to claim 1, wherein the control section closes the water suction valve in addition to not causing the pump to perform the water suction operation when not performing the water suction operation. a priming tank that holds water different from the water in the tank or a portion of the water in the tank;
Further comprising an automatic priming switch that is operated when automatically moving the water held by the priming tank to the water suction pipe,
The control unit is configured to cause the water suction piping to be primed when the automatic priming switch is operated and when the amount of retained water detected by the water amount sensor is less than a set unnecessary amount of water absorption. The water sprinkler truck according to claim 1 or 2, wherein the water absorption operation is performed by sending water from a tank and then driving the pump.