Loader refueling pump control circuit

Abstract

The utility model relates to the field of loading machine refueling control, and discloses a loading machine refueling pump control circuit which comprises a frequently-used electric power supply and a key electric power supply, and a liquid level sensor, a first normally-open relay and a second normally-open relay are connected to the frequently-used electric power supply in parallel. The first normally-open relay is electrically connected with a normally-closed relay and is electrically connected with a key electric power supply, the liquid level sensor is electrically connected with the second normally-open relay and the normally-closed relay, the second normally-open relay is electrically connected with a display instrument, and the normally-closed relay is electrically connected with an oil adding pump. The refueling pump control circuit is easy to operate and capable of monitoring refueling amount in real time, flexibility and reliability of the refueling pump control circuit are achieved through cooperation of the key electric power source and the common electric power source with the relays, use efficiency during refueling of the loading machine is improved, and safety of the loading machine is improved. And through the electrical connection relationship among the liquid level sensor, the relay, the display instrument, the refueling pump and other elements, the real-time monitoring and control of the liquid level of the fuel oil of the loading machine by a worker are realized.

Description

Technical Field

[0001] The utility model relates to the field of loader refueling control, in particular to a loader refueling pump control circuit. Background Art

[0002] In the current market, loaders are widely used in various engineering and construction projects. However, in actual application, due to the limitations of the working environment, such as remote construction sites and complex terrain, loaders are often unable to conveniently go to gas stations for refueling. This makes it an urgent problem to accurately determine whether the refueling amount is in place when the loader is refueling on site.

[0003] The existing loader fuel tank design relies on human observation to determine whether refueling is complete. However, this method has many problems: first, human observation is easily affected by individual differences of drivers, resulting in inaccurate judgment of the refueling amount; second, in a busy working environment, the driver may not be able to focus on observing the liquid level in the fuel tank, resulting in insufficient or excessive refueling; finally, the fuel tank of some loaders is located inside the vehicle body, which makes it more difficult to observe, causing great inconvenience to the driver. Utility Model Content

[0004] The purpose of the utility model is to provide a circuit for controlling a fuel pump of a loader in view of the above problems.

[0005] To achieve the above-mentioned purpose, the utility model discloses a loader fuel pump control circuit, including a common power supply and a key power supply, the common power supply is connected in parallel with a liquid level sensor, a first normally open relay and a second normally open relay, the first normally open relay is electrically connected to a normally closed relay and is electrically connected to the key power supply, the liquid level sensor is electrically connected to the second normally open relay and the normally closed relay respectively, the second normally open relay is electrically connected to a display instrument, and the normally closed relay is electrically connected to a fuel pump.

[0006] After adopting the above structure, the flexibility and reliability of the refueling pump control circuit are realized through the design of the key power supply and the common power supply, and the efficiency of the loader during refueling is improved. Through the electrical connection relationship between the liquid level sensor, relay, display instrument and refueling pump and other components, the staff can realize real-time monitoring and control of the loader fuel level, and improve the safety and accuracy of the refueling process.

[0007] Preferably, the first normally open relay includes a first relay normally open contact power-on circuit and a first relay coil power-on circuit, the input end circuit of the first relay normally open contact power-on circuit is electrically connected to the key power supply, the input end circuit of the first relay coil power-on circuit is electrically connected to the common power supply, and the output end circuit of the first relay coil power-on circuit is electrically connected to the normally closed relay.

[0008] Preferably, the normally closed relay includes a relay normally closed contact power-on circuit and a third relay coil power-on circuit, the input end circuit of the relay normally closed contact power-on circuit is electrically connected to the output end of the first relay normally open contact power-on circuit, the output end circuit of the relay normally closed contact power-on circuit is electrically connected to the gas pump, and the input end circuit of the third relay coil power-on circuit is electrically connected to the liquid level sensor.

[0009] Preferably, the second normally open relay includes a second relay normally open contact power-on circuit and a second relay coil power-on circuit, the input end circuit of the second relay normally open contact power-on circuit is electrically connected to a common power supply and the output end circuit of the second relay normally open contact power-on circuit is electrically connected to a display instrument, and the input end circuit of the second relay coil power-on circuit is electrically connected to a liquid level sensor.

[0010] Preferably, the liquid level sensor includes a sensor input circuit and a sensor output circuit, the sensor input circuit is connected to a common power supply, and the sensor output circuit is electrically connected to the input end of the second relay coil power circuit and the input end of the third relay coil power circuit, respectively.

[0011] To sum up, the beneficial effects of the utility model are: the utility model is simple to operate and can monitor the refueling amount in real time. Through the design of the key power supply and the common power supply, the flexibility and reliability of the refueling pump control circuit are realized, and the efficiency of the loader during refueling is improved. Through the electrical connection relationship between the liquid level sensor, relay and display instrument and the refueling pump and other components, the staff can monitor and control the loader fuel level in real time, and the safety and accuracy of the refueling process are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is the electrical schematic diagram of the utility model as a whole.

[0013] In the figure: 1. Common power supply; 2. Key power supply; 3. Liquid level sensor; 4. First normally open relay; 5. Second normally open relay; 6. Normally closed relay; 7. Display instrument; 8. Fuel pump; 9. First relay normally open contact power circuit; 10. First relay coil power circuit; 11. Relay normally closed contact power circuit; 12. Third relay coil power circuit; 13. Second relay normally open contact power circuit; 14. Second relay coil power circuit; 15. Sensor input circuit; 16. Sensor output circuit. DETAILED DESCRIPTION

[0014] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0015] The following is a description of preferred embodiments of the present invention in conjunction with the accompanying drawings.

[0016] like Figure 1 As shown, the utility model includes a common power supply 1 and a key power supply 2, a liquid level sensor 3, a first normally open relay 4 and a second normally open relay 5 are connected in parallel to the common power supply 1, the first normally open relay 4 includes a first relay normally open contact power circuit 9 and a first relay coil power circuit 10, and the second normally open relay 5 includes a second relay normally open contact power circuit 13 and a second relay coil power circuit 14, the first normally open relay 4 is electrically connected to a normally closed relay 6 and is electrically connected to the key power supply 2, and the normally closed relay 6 is electrically connected to a refueling pump 8, when designed, the input end circuit of the first relay normally open contact power circuit 9 is electrically connected to the key power supply 2, and the input end circuit of the first relay coil power circuit 10 is electrically connected to the common power supply 1 Electrical connection, the output end circuit of the first relay coil power-on circuit 10 is electrically connected to the normally closed relay 6. When manufactured, the normally closed relay 6 includes a relay normally closed contact power-on circuit 11 and a third relay coil power-on circuit 12, wherein the input end circuit of the relay normally closed contact power-on circuit 11 is electrically connected to the output end of the first relay normally open contact power-on circuit 9, and the output end circuit of the relay normally closed contact power-on circuit 11 is electrically connected to the refueling pump 8, wherein the input end circuit of the third relay coil power-on circuit 12 is electrically connected to the liquid level sensor 3. In this way, the key power supply 2 and the common power supply 1 cooperate with the first normally open relay 4 and the normally closed relay 6 to achieve the flexibility and reliability of the refueling pump 8 control circuit, and improve the use efficiency of the loader when refueling.

[0017] The above-mentioned liquid level sensor 3 is electrically connected to the second normally open relay 5 and the normally closed relay 6 respectively, and a display instrument 7 is electrically connected to the second normally open relay 5. During design, the input end circuit of the second relay normally open contact power-on circuit 13 is electrically connected to the common power supply 1 and the output end circuit of the second relay normally open contact power-on circuit 13 is electrically connected to the display instrument 7, and the input end circuit of the second relay coil power-on circuit 14 is electrically connected to the liquid level sensor 3; during manufacturing, the above-mentioned liquid level sensor 3 includes a sensor input end circuit 15 and a sensor output end circuit 16, wherein the sensor input end circuit 15 is connected to the common power supply 1, and the sensor output end circuit 16 is electrically connected to the input end of the second relay coil power-on circuit 14 and the input end of the third relay coil power-on circuit 12, respectively.

[0018] During use, when the loader is refueling, the key is turned on, the refueling switch is closed, the first relay coil power circuit 10 is energized to close the switch of the first normally open relay 4, and at the same time, the electrical signal passes through the relay normally closed contact power circuit 11, thereby controlling the refueling pump 8 to refuel the loader; when the oil level reaches the set value, the liquid level sensor 3 outputs an electrical signal to the normally closed relay 6, so that the third relay coil power circuit 12 is energized and the switch of the normally closed relay 6 is disconnected, and the refueling pump 8 stops working. At the same time, the liquid level sensor 3 also outputs an electrical signal to the second relay electrical coil power circuit, so that the switch of the second normally open relay 5 is energized. At this time, the display instrument 7 receives a low-level signal, and the indicator light reminds the driver that refueling is complete.

[0019] The above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein with equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A loader fuel pump control circuit, comprising a common power supply (1) and a key power supply (2), characterized in that: The common power supply (1) is connected in parallel with a liquid level sensor (3), a first normally open relay (4), and a second normally open relay (5); the first normally open relay (4) is electrically connected to a normally closed relay (6) and is electrically connected to the key power supply (2); the liquid level sensor (3) is electrically connected to the second normally open relay (5) and the normally closed relay (6), respectively; the second normally open relay (5) is electrically connected to a display instrument (7); and the normally closed relay (6) is electrically connected to a refueling pump (8).

2. The loader refueling pump control circuit as claimed in claim 1, characterized in that: The first normally open relay (4) comprises a first relay normally open contact power circuit (9) and a first relay coil power circuit (10), the input end circuit of the first relay normally open contact power circuit (9) being electrically connected to a key power source (2), the input end circuit of the first relay coil power circuit (10) being electrically connected to a common power source (1), and the output end circuit of the first relay coil power circuit (10) being electrically connected to a normally closed relay (6).

3. The loader refueling pump control circuit as claimed in claim 2, characterized in that: The normally closed relay (6) comprises a relay normally closed contact power circuit (11) and a third relay coil power circuit (12); the input end circuit of the relay normally closed contact power circuit (11) is electrically connected to the output end of the first relay normally open contact power circuit (9); the output end circuit of the relay normally closed contact power circuit (11) is electrically connected to the refueling pump (8); and the input end circuit of the third relay coil power circuit (12) is electrically connected to the liquid level sensor (3).

4. The loader refueling pump control circuit as claimed in claim 1, characterized in that: The second normally open relay (5) comprises a second relay normally open contact power circuit (13) and a second relay coil power circuit (14); the input end circuit of the second relay normally open contact power circuit (13) is electrically connected to a common power source (1) and the output end circuit of the second relay normally open contact power circuit (13) is electrically connected to a display instrument (7); and the input end circuit of the second relay coil power circuit (14) is electrically connected to a liquid level sensor (3).

5. The loader refueling pump control circuit as claimed in claim 1, characterized in that: The liquid level sensor (3) comprises a sensor input circuit (15) and a sensor output circuit (16), wherein the sensor input circuit (15) is connected to a common power supply (1), and the sensor output circuit (16) is respectively electrically connected to an input end of a second relay coil power circuit (14) and an input end of a third relay coil power circuit (12).

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