Device for intelligently detecting hydraulic oil level

Abstract

The utility model relates to the technical field of engineering machinery hydraulic system detection, and provides an intelligent hydraulic oil level detection device which comprises a hydraulic oil tank, a float type liquid level switch, a controller and an instrument. The floater type liquid level switch is located on a hydraulic oil tank and comprises a floater assembly, a shell assembly and an oil level alarm switch connector. A guide groove is formed in the shell assembly, the floater assembly is connected with the guide groove of the shell assembly through a bayonet lock, and a magnet is arranged in the floater assembly; the shell assembly is installed on a hydraulic oil tank, a signal transmission circuit is arranged in the shell assembly, the shell assembly is connected with the reed pipe in series, the reed pipe comprises a plurality of reeds, the reeds are attracted when the magnet gets close to the reed pipe, and the reeds are disconnected when the magnet gets away from the reed pipe. The oil level alarm switch connector is connected with the shell assembly and the controller; the controller is connected with the instrument through the wire harness, generates a control instruction and transmits the control instruction to the instrument. The hydraulic oil tank solves the problems that an excavator does not work and hydraulic parts are damaged due to the fact that hydraulic oil is not filled in time due to the fact that the hydraulic oil level is inconvenient to observe in an existing oil tank.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system testing technology for engineering machinery, and in particular to an intelligent device for detecting hydraulic oil level. Background Technology

[0002] Excavators play a vital role in modern engineering construction, not only improving work efficiency but also ensuring operational safety. The "blood" of an excavator is hydraulic oil; the hydraulic oil fills the cylinders, driving the excavator's working device to perform various tasks. Hydraulic oil is stored in a hydraulic oil tank, but most tanks are sealed, making it difficult to accurately determine the hydraulic oil level.

[0003] Traditional hydraulic level detection relies on an external gauge to roughly estimate the hydraulic fluid level, requiring frequent monitoring by the operator, which impacts working hours. If the operator is busy and forgets to check the level, or if a leak causes the level to drop, failure to replenish hydraulic fluid promptly can not only disrupt excavator operation but also damage hydraulic components. Therefore, traditional hydraulic tanks are inconvenient for monitoring the fluid level, making it difficult for the operator to know in a timely manner whether hydraulic fluid needs to be added. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an intelligent device for detecting hydraulic oil level, so as to solve the problem that the inconvenience of observing the hydraulic oil level leads to untimely hydraulic oil filling, resulting in excavator malfunction and damage to hydraulic components.

[0005] The solution adopted in this utility model is as follows:

[0006] A device for intelligently detecting hydraulic oil level includes a hydraulic oil tank, a float-type level switch, a controller, and an instrument;

[0007] The float-type level switch is located on the hydraulic oil tank and includes a float assembly, a housing assembly, and an oil level alarm switch connector. The housing assembly has a guide groove, and the float assembly is connected to the guide groove of the housing assembly via a snap-fit ​​pin. The float assembly contains a magnet. The housing assembly is mounted on the hydraulic oil tank using a torque wrench. The housing assembly contains a signal transmission circuit, and a reed switch is connected in series in the signal transmission circuit. The reed switch includes multiple reeds. When the magnet approaches the reed switch, the reeds are attracted; when the magnet moves away from the reed switch, the reeds are disengaged. One end of the oil level alarm switch connector is connected to the housing assembly, and the other end is connected to the controller via a wiring harness.

[0008] The controller is connected to the instrument via a wiring harness, generates control commands, and transmits them to the instrument.

[0009] Furthermore, the float-type level switch is installed 100mm above the lowest hydraulic oil level.

[0010] Furthermore, the minimum hydraulic oil level is the hydraulic oil level when all cylinders are in their most extended state and the excavator is climbing a 35° slope.

[0011] Furthermore, the instrument integrates a buzzer, which is soldered onto the circuit board inside the instrument.

[0012] Furthermore, the wiring harness includes a vehicle body wiring harness, a main cab wiring harness, a secondary cab wiring harness, and an interior wiring harness.

[0013] Furthermore, one end of the vehicle body wiring harness is connected to the fuel level alarm switch connector, and the other end is connected to the main wiring harness in the cab; the other end of the main wiring harness in the cab is partially connected to the controller and partially connected to the auxiliary wiring harness in the cab; the auxiliary wiring harness in the cab is connected to one end of the interior wiring harness, and the other end of the interior wiring harness is connected to the instrument panel.

[0014] Furthermore, the wiring harness comprises a CAN line, a power line, and a ground line.

[0015] Furthermore, the instrument panel is mounted on the interior trim panel of the driver's cab.

[0016] Furthermore, the float-type liquid level switch also includes a locking nut and an oil level alarm switch cover; the locking nut fixes the outer casing assembly on the hydraulic oil tank, and the oil level alarm switch cover is installed on the locking nut.

[0017] Furthermore, both the housing assembly and the float assembly of the float-type liquid level switch are made of stainless steel.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention uses a float-type level switch to detect and report the oil level, transmitting the information to the controller. The controller then issues commands (alarm or no-alarm commands) to control the instrument to perform related actions (whether to sound a buzzer). This enables low oil level alarms, promptly reminding the driver to add hydraulic oil and solving the problem of excavator malfunction and hydraulic component damage caused by untimely hydraulic oil addition due to difficulty in observing the hydraulic oil level.

[0020] The controller of this invention issues an alarm command when it does not receive a signal for 5 consecutive minutes, which can prevent false alarms from occurring when the excavator is on bumpy roads or going uphill or downhill.

[0021] Advantages of the present invention in additional aspects 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

[0022] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0023] Figure 1 This is a schematic diagram of the hydraulic oil tank structure in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram showing the connection between the outer shell assembly and the float assembly in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the wire harness distribution in an embodiment of this utility model.

[0026] Among them, 1-hydraulic oil tank; 2-float assembly; 3-outer shell assembly; 4-locking nut; 5-oil level alarm switch cover; 6-oil level alarm switch connector; 7-vehicle body wiring harness; 8-controller; 9-cab main wiring harness; 10-cab auxiliary wiring harness; 11-interior wiring harness; 12-instrument; 13-magnet; 14-reed switch. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0028] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this utility model.

[0029] Example 1

[0030] like Figure 1 , Figure 2 As shown, an intelligent hydraulic oil level detection device includes a hydraulic oil tank 1, a float-type level switch, a controller 8, and an instrument 12. The float-type level switch is located on the hydraulic oil tank 1 and is used to provide feedback on the oil level signal based on the oil level height. It includes a float assembly 2, a housing assembly 3, and an oil level alarm switch connector 6. A signal transmission circuit is provided inside the housing assembly, and a reed switch 14 is connected in series in the signal transmission circuit. The reed switch 14 includes multiple reeds. When a magnet 13 approaches the reed switch 14, the reeds are attracted; when the magnet 13 moves away from the reed switch 14, the reeds are disengaged. The signal transmission circuit adopts existing technology.

[0031] Specifically, the housing assembly 3 is provided with a guide groove, and the float assembly 2 is connected to the guide groove of the housing assembly 3 by a snap-fit. The float assembly 2 contains a magnet 13. The housing assembly 3 is installed on the hydraulic oil tank 1 by a torque wrench. One end of the oil level alarm switch connector 6 is connected to the housing assembly 3, and the other end is connected to the controller 8 through a wiring harness. The controller 8 is connected to the instrument 12 through a wiring harness. The controller 8 receives the oil level signal fed back by the float-type liquid level switch, generates control commands, and transmits them to the instrument 12.

[0032] Instrument 12 is mounted on the interior panel at the right front of the driver's cab. An integrated buzzer is soldered onto a circuit board inside the instrument. The controller 8 generates control commands including alarm commands and non-alarm commands; when the instrument receives a non-alarm command, it does not emit a buzzer; when the instrument receives an alarm command, it emits a buzzer.

[0033] In this embodiment, the float assembly 2 floats up and down according to the oil level. A guide groove designed on the housing assembly 3 allows the housing assembly 3 to better engage with the float assembly 2 via a locking pin. The locking pin slides smoothly without excessive friction or jamming, maintaining the free movement of the float assembly 2. The float-type level switch uses the floating motion of the float assembly 2 to provide feedback on the oil level signal.

[0034] Specifically, changes in oil level cause changes in the buoyancy of float assembly 2, which in turn causes it to float up and down in the hydraulic oil. The specific principle is as follows:

[0035] When the liquid level rises, the float assembly 2 rises accordingly, and the internal magnet 13 approaches the reed switch 14. The magnetic field of the magnet 13 triggers the reed switch 14, causing it to close, thus activating the signal transmission circuit and outputting an oil level signal. When the liquid level falls, the float assembly 2 falls accordingly, the magnet 13 moves away from the reed switch 14, the reed switch 14 opens, the signal transmission circuit is disconnected, and no oil level signal can be output.

[0036] Specifically, the wiring harness includes the body wiring harness 7, the cab main wiring harness 9, the cab auxiliary wiring harness 10, and the interior wiring harness 11. One end of the body wiring harness 7 is connected to the fuel level alarm switch connector 6, and the other end is connected to the cab main wiring harness 9. The other end of the cab main wiring harness 9 is partially connected to the controller 8 and partially connected to the cab auxiliary wiring harness 10. The cab auxiliary wiring harness 10 is connected to one end of the interior wiring harness 11, and the other end of the interior wiring harness 11 is connected to the instrument cluster 12. Control commands generated by the controller 8 are transmitted sequentially to the instrument cluster 12 via the cab auxiliary wiring harness 10 and the interior wiring harness 11.

[0037] The wiring harness consists of CAN wires, power wires, and ground wires.

[0038] Specifically, the float-type level switch also includes a locking nut 4 and an oil level alarm switch cover 5; the locking nut 4 fixes the outer casing assembly 3 on the hydraulic oil tank, and the oil level alarm switch cover 5 is installed on the locking nut 4 to seal and protect the internal components.

[0039] The installation position of the float-type level switch in the hydraulic oil tank 1 is crucial. If the switch position is too high (if the oil level is not low, but the float assembly is far away from the housing assembly), it will cause an early alarm. If the switch position is too low (the oil level is already very low, but the float assembly is still in contact with the housing assembly), it will cause an alarm delay, resulting in the main pump sucking in air and damaging the hydraulic components.

[0040] In this embodiment, the float-type level switch is installed 100mm above the minimum hydraulic oil level. Excavators typically operate on flat roads, bumpy roads, and uphill and downhill conditions. The minimum hydraulic oil level is the level when all cylinders are at their maximum extension and the excavator is climbing a 35° incline, ensuring the excavator can operate normally during the period from receiving an alarm to adding hydraulic oil.

[0041] Specifically, both the float assembly 2 and the housing assembly 3 of the float-type liquid level switch are made of stainless steel.

[0042] In this embodiment, the specific working principle of the float-type level switch for detecting oil level is as follows:

[0043] First, install the float-type level switch on the hydraulic oil tank 1 using a torque wrench, and ensure that the tightening torque is 10 N·m.

[0044] When the hydraulic oil level in the tank is higher than the hydraulic oil level alarm switch position, the float assembly 2 is balanced by the buoyancy of the hydraulic oil and its own weight. At this time, the magnet 13 inside the float assembly 2 is in contact with the reed switch 14 inside the housing assembly 3, the reed is closed, and the float-type level switch feeds the oil level signal back to the controller 8 via the vehicle body wiring harness 7 and the cab main wiring harness 9. Upon receiving the oil level signal, the controller 8 generates a no-alarm command, which is transmitted to the instrument panel 12 via the cab auxiliary wiring harness 10 and the interior wiring harness 11 without emitting a buzzer alarm, and no hydraulic oil needs to be added.

[0045] As the hydraulic oil level decreases, the weight of the float assembly 2 gradually exceeds the buoyancy of the hydraulic oil, causing the float assembly 2 to gradually move away from the housing assembly 3. When the float assembly 2 moves away from the housing assembly 3 to the point where the reed switch 14 can no longer sense the magnetic field, the reed disconnects, and the float-type level switch sends no oil level signal back to the controller 8. If the controller 8 does not receive a signal for 5 consecutive minutes, it immediately issues an alarm command, which is transmitted to the instrument panel 12 via the cab auxiliary wiring harness 10 and the interior wiring harness 11. Upon receiving the alarm command, the instrument panel 12 sounds an alarm, allowing the driver to add hydraulic oil promptly. Currently, in the construction machinery field, the delay time is generally within 1 minute, while in this embodiment, the 5-minute delay aims to reduce false alarms. Delayed alarms are a common technique used by technicians in the construction machinery field.

[0046] After hydraulic oil is refilled, the float assembly 2 rebalances under the influence of gravity and buoyancy, and the reed switch 14 approaches the magnet 13 again, activating the signal transmission circuit. The controller 8 receives the oil level signal from the float-type level switch again and simultaneously sends a no-alarm command to the instrument 12, which then stops the alarm.

[0047] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A device for intelligently detecting hydraulic oil level, characterized in that, Includes hydraulic oil tank, float-type level switch, controller and instrument; The float-type level switch is located on the hydraulic oil tank and includes a float assembly, a housing assembly, and an oil level alarm switch connector. The housing assembly has a guide groove, and the float assembly is connected to the guide groove of the housing assembly via a snap-fit ​​pin. The float assembly contains a magnet. The housing assembly is mounted on the hydraulic oil tank using a torque wrench. The housing assembly contains a signal transmission circuit, and a reed switch is connected in series in the signal transmission circuit. The reed switch includes multiple reeds. When the magnet approaches the reed switch, the reeds are attracted; when the magnet moves away from the reed switch, the reeds are disengaged. One end of the oil level alarm switch connector is connected to the housing assembly, and the other end is connected to the controller via a wiring harness. The controller is connected to the instrument via a wiring harness, generates control commands, and transmits them to the instrument.

2. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The float-type level switch is installed 100mm above the lowest hydraulic oil level.

3. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The minimum hydraulic oil level is the hydraulic oil level when all cylinders are in their most extended state and the excavator is climbing a 35° slope.

4. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The instrument integrates a buzzer, which is soldered onto a circuit board inside the instrument.

5. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The wiring harness includes the vehicle body wiring harness, the main cab wiring harness, the auxiliary cab wiring harness, and the interior wiring harness.

6. The intelligent hydraulic oil level detection device as described in claim 5, characterized in that, One end of the vehicle body wiring harness is connected to the fuel level alarm switch connector, and the other end is connected to the main wiring harness in the cab; the other end of the main wiring harness in the cab is partially connected to the controller and partially connected to the auxiliary wiring harness in the cab; the auxiliary wiring harness in the cab is connected to one end of the interior wiring harness, and the other end of the interior wiring harness is connected to the instrument panel.

7. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The wiring harness consists of a CAN line, a power line, and a ground line.

8. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The instrument panel is mounted on the interior trim panel of the driver's cab.

9. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The float-type liquid level switch also includes a locking nut and an oil level alarm switch cover; the locking nut fixes the outer shell assembly on the hydraulic oil tank, and the oil level alarm switch cover is installed on the locking nut.

10. The intelligent hydraulic oil level detection device as described in claim 1, characterized in that, The housing assembly and float assembly of the float-type liquid level switch are both made of stainless steel.

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