Watering cart capable of preventing water pump from idling without water

Abstract

The utility model discloses a prevent water pump waterless idling watering cart belongs to the city environmental sanitation technical field, including the car body, and the water tank fixed on the car body, install low water level switch in the water tank, and the driver's cabin of car body is installed with the power takeoff switch and relay, is installed with the power takeoff solenoid valve on the car body, and low water level switch, relay and power takeoff switch are connected in series between, and the power takeoff solenoid valve is parallel with low water level switch, relay and power takeoff switch. The utility model has the advantages of: can stably avoid watering car waterless idling.

Description

Technical Field

[0001] This utility model relates to the field of urban sanitation technology, specifically to a sprinkler truck that prevents the water pump from running dry. Background Technology

[0002] Currently, there are two main ways to prevent water pumps from running dry on sprinkler trucks: 1. Only a low water level alarm device is available, and the driver manually disengages the power take-off after hearing the low water level alarm; 2. A friction power take-off is used, which automatically disengages when the water level is low.

[0003] The shortcomings and problems of existing products are as follows: The first method requires the driver to operate it actively. If the working environment is noisy, the driver cannot accurately disengage the power take-off. The second method has the following disadvantages: When the water level in the tank is equal to the low water level switch, the water level in the tank will fluctuate as the vehicle moves. In this case, the low water level sensor will sometimes engage and sometimes disengage, causing the friction power take-off to frequently disengage and engage, which will cause greater wear on the device and affect the operation. Utility Model Content

[0004] The present invention aims to solve the technical problems mentioned in the background section above, and to provide a water truck that prevents the water pump from running dry, thereby improving the reliability of the water truck during operation.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows: a sprinkler truck for preventing the water pump from running dry, comprising a vehicle body and a water tank fixed on the vehicle body, a low water level switch installed inside the water tank, a power take-off switch and a relay installed in the driver's cab of the vehicle body, a power take-off solenoid valve installed on the vehicle body, the low water level switch, the relay and the power take-off switch connected in series, and the power take-off solenoid valve connected in parallel with the low water level switch, the relay and the power take-off switch.

[0006] In some embodiments, the power take-off switch is provided with a power take-off start button and a power take-off stop button, which are connected in series with a low water level switch and a relay.

[0007] In some embodiments, the two ends of the power take-off (PTO) start button are connected to a normally open relay contact I, and the PTO solenoid valve is connected to a normally open relay contact II in the parallel circuit with the low water level switch, the relay and the PTO switch.

[0008] The advantages of this invention compared to existing technologies are: improved reliability and prevention of water trucks running dry.

[0009] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of the sprinkler truck for preventing the water pump from running dry, according to an embodiment of the present utility model.

[0011] Figure 2 This is a schematic diagram of the circuit of a sprinkler truck to prevent the water pump from running dry, according to an embodiment of the present invention.

[0012] In the attached diagram: 1. Low water level switch; 2. Relay; 3. Power take-off solenoid valve; 4. Power take-off switch; 21. Normally open contact I; 22. Normally open contact II; 41. Power take-off start button; 42. Power take-off stop button. Detailed Implementation

[0013] The present invention will now be described in further detail.

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0015] Combination Figure 1 As shown, this embodiment provides a water truck to prevent the water pump from running dry. A water tank is fixed on the vehicle body, and a low water level switch 1 is installed inside the water tank. A power take-off switch 4 and a relay 2 are installed in the driver's cab of the vehicle body, and a power take-off solenoid valve 3 is installed on the vehicle body.

[0016] Combination Figure 2 As shown, the power take-off switch 4 is configured as a power take-off start button 41 and a power take-off stop button 42. The power take-off start button 41, the power take-off stop button 42, the low water level switch 1 and the relay 2 are connected in series. The two ends of the power take-off start button 41 are connected across the normally open contact I21 of the relay 2. The power take-off solenoid valve 3 and the normally open contact II22 of the relay 2 are connected in series. The two ends of the circuit where the low water level switch 1, the relay 2 and the power take-off switch 4 are located are connected in parallel to the power take-off solenoid valve 3 and the normally open contact II22 of the relay 2.

[0017] When using this embodiment:

[0018] 1. If the tank is empty, the low water level switch 1 will be disconnected. Even if the power take-off start button 41 is pressed to energize it, the power take-off solenoid valve 3 will still not be energized because the relay 2 cannot be engaged. In this case, the water pump will not turn.

[0019] 2. When there is water in the tank, the low water level switch 1 is closed. At this time, manually press the power take-off start button 41 to energize it. The relay 2 is energized and closes. The normally open contact II 22 and normally open contact I 21 of the relay 2 are closed. The power take-off solenoid valve 3 is energized and the water pump works.

[0020] 3. As water is continuously sprayed, the water level in the tank drops below the low water level switch 1. The low water level switch 1 is disconnected. At this time, the relay 2 is de-energized, and the normally open contact II22 and normally open contact I21 of the relay 2 are disconnected. The power take-off solenoid valve 3 is de-energized, and the water pump stops working.

[0021] 4. If the driver wants to end the work before the water level reaches the low water level position, he only needs to manually disconnect the power take-off shut-off button 42. At this time, relay 2 is de-energized, the normally open contact II 22 and normally open contact I 21 of relay 2 are disconnected, the power take-off solenoid valve 3 is de-energized, and the water pump stops working.

[0022] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A sprinkler truck for preventing the water pump from running dry, comprising a vehicle body and a water tank fixed to the vehicle body, characterized in that: A low water level switch (1) is installed inside the water tank. A power take-off switch (4) and a relay (2) are installed in the driver's cab of the vehicle body. A power take-off solenoid valve (3) is installed on the vehicle body. The low water level switch (1), the relay (2) and the power take-off switch (4) are connected in series. The power take-off solenoid valve (3) is connected in parallel with the low water level switch (1), the relay (2) and the power take-off switch (4). When the relay (2) is energized or de-energized, the power take-off solenoid valve (3) is energized or de-energized accordingly.

2. The sprinkler truck for preventing the water pump from running dry according to claim 1, characterized in that: The power take-off switch (4) is equipped with a power take-off start button (41) and a power take-off stop button (42), which are connected in series with the low water level switch (1) and the relay (2).

3. The sprinkler truck for preventing the water pump from running dry according to claim 2, characterized in that: The two ends of the power take-off start button (41) are connected to the normally open contacts I (21) of the relay (2), and the normally open contacts II (22) of the relay (2) are provided on the parallel circuit of the power take-off solenoid valve (3) and the low water level switch (1), the relay (2) and the power take-off switch (4).

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