Automatic hydraulic oil filling system

Abstract

The utility model discloses an automatic hydraulic oil filling system, which belongs to the technical field of hydraulic oil filling of engineering machinery and comprises a hydraulic oil tank, the hydraulic oil tank is communicated with a hydraulic oil barrel through an oil pipe, one end of the oil pipe close to the hydraulic oil tank is connected with a hydraulic oil pump, and the hydraulic oil pump is controlled through a control circuit. The control circuit comprises a switch relay and an oil pump relay, the switch relay is connected with the oil floating proximity switch and receives output signals of the oil floating proximity switch for control, and the oil pump relay is connected with the hydraulic oil pump enabling switch through a normally open contact of the switch relay. When the oil floating proximity switch does not output a signal, the enabling switch is closed to start the hydraulic oil pump to automatically pump oil to the hydraulic oil tank, and an operator does not need to execute operation all the time; meanwhile, the height of hydraulic oil in the oil tank is monitored through the oil floating proximity switch, oil pumping operation is automatically cut off, automatic filling of the hydraulic oil is completed, and real-time checking is not needed.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic oil filling for engineering machinery, and in particular relates to an automatic hydraulic oil filling system. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] Traditional loaders usually use a manual pump or barreled oil to pour directly into the machine when overhauling or filling hydraulic oil. This method has many limitations. First, manual filling requires manual operation, which is labor-intensive, and the filling amount is difficult to accurately control, which can easily cause oil waste or insufficient filling. Second, impurities are easily introduced during manual filling, affecting the cleanliness and working performance of the hydraulic system.

[0004] With the widespread application of loaders in engineering construction, logistics and transportation, the requirements for the work efficiency and safety of loaders are becoming higher and higher. However, the existing automatic hydraulic oil filling device still requires the operator to operate it by hand and still needs to be checked in real time next to the oil tank to avoid problems caused by improper filling, which takes up the operator's time and reduces work efficiency. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, the utility model provides an automatic hydraulic oil filling system to realize automatic filling of the hydraulic oil of a loader.

[0006] To achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] An automatic hydraulic oil filling system comprises a hydraulic oil tank, the hydraulic oil tank is connected to a hydraulic oil barrel through an oil pipe, one end of the oil pipe close to the hydraulic oil tank is connected to a hydraulic oil pump, and the hydraulic oil pump is controlled by a control circuit;

[0008] The control circuit includes a switch relay and an oil pump relay. The coil of the switch relay is connected in series with the oil float proximity switch and connected to a power supply. One end of the normally closed contact of the switch relay is connected to the hydraulic oil pump enable switch, and the other end is suspended. The normally open contact of the switch relay is connected to one end of the coil of the oil pump relay, and the other end of the coil of the oil pump relay is grounded. The normally open contact of the oil pump relay is connected to the power supply. One end of the normally closed contact of the oil pump relay is suspended, and the other end is connected to the hydraulic oil pump.

[0009] According to a further technical solution, a through hole is provided on one side of the top of the hydraulic oil tank, and a float rod passes through the through hole and is placed vertically, and the bottom of the float rod contacts the bottom wall of the hydraulic oil tank.

[0010] According to a further technical solution, a hydraulic oil float is provided on the float rod, and a magnet is provided inside the hydraulic oil float.

[0011] According to a further technical solution, the float rod is a T-shaped structure.

[0012] According to a further technical solution, an oil float proximity switch is provided on one side wall of the hydraulic oil tank close to the float rod.

[0013] According to a further technical solution, the horizontal position of the oil float proximity switch is aligned with the hydraulic oil height set when the hydraulic oil tank is full.

[0014] According to a further technical solution, the oil float proximity switch output is connected to a switch relay, and a switch signal is output to the switch relay.

[0015] According to a further technical solution, a breathing port is also provided on the top of the hydraulic oil tank.

[0016] According to a further technical solution, the hydraulic oil pump comprises an oil pump body, one side of the oil pump body is connected to an oil pump suction pipe, the bottom side of the oil pump body is connected to an oil pump delivery pipe, and the oil pump delivery pipe is placed inside the hydraulic oil tank.

[0017] According to a further technical solution, a one-way valve is provided on the oil suction pipe of the oil pump.

[0018] Beneficial effects of the utility model:

[0019] , The ignition line is closed by the spring, and the ignition line is closed by the spring, so the ignition line will not be turned on when the ignition is turned on. When the ignition line is closed, the ignition will not be turned on when the ignition is turned on. If the ignition line is closed by the spring, the ignition line will be turned on when the ignition is turned on. If the ignition line is closed by the spring, the ignition line will be turned on when the ignition is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0021] Figure 1 This is a structural diagram of the oil tank side of the automatic hydraulic oil filling system of the utility model embodiment;

[0022] Figure 2 This is a control circuit diagram of the automatic hydraulic oil filling system in the embodiment of the utility model.

[0023] Among them, 1- hydraulic oil tank, 2- hydraulic oil barrel, 3- hydraulic oil pump, 4- float rod, 5- hydraulic oil float, 6- oil float proximity switch, 7- breathing port, 8- oil pump suction pipe, 9- oil pump delivery pipe, 10- switch relay, 11- hydraulic oil pump enable switch, 12- oil float proximity switch (circuit diagram), 13- oil pump relay, 14 one-way valve, 15- insurance resistor. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] See also Figure 1 , Figure 2 As shown, the embodiment of the utility model provides an automatic hydraulic oil filling system, including a hydraulic oil tank 1, the hydraulic oil tank 1 is connected to a hydraulic oil barrel 2 through an oil pipe, and one end of the oil pipe close to the hydraulic oil tank 1 is connected to a hydraulic oil pump 3, and the hydraulic oil pump 3 is controlled by a control circuit;

[0026] The control circuit includes a switch relay 10 and an oil pump relay 13. The coil of the switch relay 10 is connected in series with the oil float proximity switch 12 and connected to a power supply. One end of the normally closed contact of the switch relay 10 is connected to the hydraulic oil pump enable switch 11, and the other end is suspended. The normally open contact of the switch relay 10 is connected to one end of the coil of the oil pump relay 13, and the other end of the coil of the oil pump relay 13 is grounded. The normally open contact of the oil pump relay 13 is connected to the power supply, and one end of the normally closed contact of the oil pump relay 13 is suspended, and the other end is connected to the hydraulic oil pump 3.

[0027] In this embodiment, if Figure 1 As shown, a perforation is provided on one side of the top of the hydraulic oil tank 1, and a T-shaped float rod 4 is placed vertically through the perforation on the top wall of the oil tank 1, and the bottom of the float rod 4 contacts the bottom wall of the hydraulic oil tank 1; a hydraulic oil float 5 is provided on the float rod 4, and a magnet is provided inside the hydraulic oil float 5, and the hydraulic oil float 5 is used to accurately reflect the liquid level and oil volume of the hydraulic oil in the oil tank. In other words, when the hydraulic oil level in the hydraulic oil tank 1 changes, the hydraulic oil float 5 will float up and down in the oil according to the buoyancy principle, and the position of the hydraulic oil float 5 directly reflects the liquid level and oil volume.

[0028] The float rod 4 is fastened to the top of the hydraulic oil tank 1 by bolts, and the hydraulic oil float 5 will not fall into the oil tank when the bottom of the float rod 4 meets the minimum liquid level, and jamming is not allowed.

[0029] An oil float proximity switch 6 is provided on one side wall of the hydraulic oil tank 1 near the float rod 4. The horizontal position of the oil float proximity switch 6 is level with the hydraulic oil height set when the hydraulic oil tank 1 is full of oil. The hydraulic oil float 5 gradually approaches the oil float proximity switch 6 as the hydraulic oil height increases. When the oil float proximity switch 6 does not output a signal, the coil of the switch relay 10 is energized, its normally open contact is closed, and the normally closed contact is disconnected. The hydraulic oil pump 3 can be started after the hydraulic oil pump enable switch 11 is closed; when the hydraulic oil float 5 enters the detection range of the oil float proximity switch 6, the magnet of the hydraulic oil float 5 activates the oil float proximity switch 6 to close, and the oil float proximity switch 6 outputs a switch signal to control the switch relay 10 to lose power, the normally open contact of the switch relay 10 is disconnected, and the normally closed contact is closed. Even if the hydraulic oil pump enable switch 11 is closed, the hydraulic oil pump 3 cannot be electrically started.

[0030] The oil float proximity switch is a Hall type proximity switch that senses magnetic field. It includes a combination of a proximity switch and a relay to control the on and off of the circuit.

[0031] In some embodiments, the float rod 4 may be a metal rod, and the hydraulic oil float is usually made of a lightweight material that is not easily damaged by liquid immersion, such as plastic or stainless steel.

[0032] A breathing port 7 is also provided on the top of the hydraulic oil tank 1 to maintain the air pressure balance inside and outside the oil tank.

[0033] The hydraulic oil pump 3 includes an oil pump body, one side of the oil pump body is connected to the oil pump suction pipe 8, and the bottom side of the oil pump body is connected to the oil pump delivery pipe 9. The oil pump delivery pipe 9 is placed inside the hydraulic oil tank 1 and is used to guide the hydraulic oil to the tank; a one-way valve 14 is provided on the oil pump suction pipe 8, and the hydraulic oil is sucked from the hydraulic oil barrel into the hydraulic oil tank through the oil pump suction pipe 8 with a one-way valve to prevent the hydraulic oil from flowing back.

[0034] In this embodiment, if Figure 2 As shown, the start and stop of the hydraulic oil pump 3 are controlled by the hydraulic oil pump enabling switch 11 and the oil float proximity switch 12 .

[0035] Both ends of the coils of the switch relay 10 and the oil pump relay 13 are connected in parallel with the diodes. A resistor 15 is connected in series near the power supply on the coil line of the switch relay 10. One end of the normally closed contact of the switch relay 10 is connected to one end of the hydraulic oil pump enable switch 11. The other end of the hydraulic oil pump enable switch 11 is connected in series with the resistor 15 and connected to the power supply. One end of the normally open contact of the oil pump relay 13 is connected in series with the resistor 15 and connected to the power supply. The resistor 15 is a safety resistor that can protect the circuit from overload. When an abnormal current appears in the circuit, the resistor wire will melt and cut off the circuit to prevent other components in the circuit from being damaged.

[0036] The hydraulic oil pump enable switch can be set in the cab or near the hydraulic oil tank for easy operation.

[0037] Working principle details:

[0038] When the operator turns on the hydraulic oil pump enable switch, the hydraulic oil pump enable switch is closed. When enabled, the hydraulic oil tank is not full of oil, that is, the hydraulic oil height does not reach the detection range of the oil float proximity switch. The oil float proximity switch does not output a signal, and the coil of the switch relay is energized so that its normally open contact is closed and the normally closed contact is disconnected, so that the coil of the oil pump relay is energized, the normally open contact of the oil pump relay is closed, and the normally closed contact is disconnected. The hydraulic oil pump is connected to the power supply, so that the hydraulic oil pump sucks oil through the oil suction port with a one-way valve. The oil is sucked into the hydraulic oil tank to prevent the hydraulic oil from flowing back; when the hydraulic oil level reaches the set height of the full oil, the float proximity switch outputs a switch signal, the control switch relay loses power, the normally open contact of the switch relay is disconnected, the normally closed contact is closed, the coil of the oil pump relay loses power, the normally open contact of the oil pump relay is disconnected, the normally closed contact is closed, the hydraulic oil pump is powered off, and then the hydraulic oil pump is controlled to stop working. Even if the hydraulic oil pump enable switch is still closed, the hydraulic oil pump cannot be electrically started, realizing automatic filling and automatic stopping of the hydraulic oil.

[0039] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An automatic hydraulic oil filling system, characterized in that: It includes a hydraulic oil tank, which is connected to a hydraulic oil barrel through an oil pipe, and one end of the oil pipe close to the hydraulic oil tank is connected to a hydraulic oil pump, and the hydraulic oil pump is controlled by a control circuit; The control circuit includes a switch relay and an oil pump relay. The coil of the switch relay is connected in series with the oil float proximity switch and connected to a power supply. One end of the normally closed contact of the switch relay is connected to the hydraulic oil pump enable switch, and the other end is suspended. The normally open contact of the switch relay is connected to one end of the coil of the oil pump relay, and the other end of the coil of the oil pump relay is grounded. The normally open contact of the oil pump relay is connected to the power supply. One end of the normally closed contact of the oil pump relay is suspended, and the other end is connected to the hydraulic oil pump.

2. An automatic hydraulic oil filling system according to claim 1, characterized in that: A through hole is provided on one side of the top of the hydraulic oil tank, through which a float rod passes and is placed vertically, and the bottom of the float rod contacts the bottom wall of the hydraulic oil tank.

3. An automatic hydraulic oil filling system as claimed in claim 2, characterized in that: A hydraulic oil float is provided on the float rod, and a magnet is provided inside the hydraulic oil float.

4. An automatic hydraulic oil filling system as claimed in claim 2, characterized in that: The float rod is a T-shaped structure.

5. The automatic hydraulic oil filling system according to claim 1, characterized in that: An oil float proximity switch is provided on one side wall of the hydraulic oil tank close to the float rod.

6. An automatic hydraulic oil filling system as claimed in claim 5, characterized in that: The horizontal position of the oil float proximity switch is aligned with the hydraulic oil height set when the hydraulic oil tank is full of oil.

7. An automatic hydraulic oil filling system as claimed in claim 5, characterized in that: The oil float proximity switch output is connected to the switch relay, and outputs a switch signal to the switch relay.

8. The automatic hydraulic oil filling system according to claim 1, characterized in that: A breathing port is also provided on the top of the hydraulic oil tank.

9. The automatic hydraulic oil filling system according to claim 1, characterized in that: The hydraulic oil pump comprises an oil pump body, one side of the oil pump body is connected to an oil pump suction pipe, the bottom side of the oil pump body is connected to an oil pump delivery pipe, and the oil pump delivery pipe is placed inside the hydraulic oil tank.

10. An automatic hydraulic oil filling system as claimed in claim 9, characterized in that: A one-way valve is arranged on the oil suction pipe of the oil pump.

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