Oiling device for lubricating oil and hydraulic oil of engineering truck transmission case

Abstract

The utility model provides an engineering truck transmission case lubricating oil and hydraulic oil refueling device, and relates to the technical field of refueling. The device comprises an oil drum, a pipeline, a flow switch, a gear pump, a motor, a flowmeter and an oil gun, the oil barrel is sequentially connected with the gear pump, the flowmeter and the oil gun through pipelines, the flow switch is arranged on the pipeline between the oil barrel and the gear pump, and the gear pump is driven by a motor. The oil drum is used for storing lubricating oil or hydraulic oil; the pipeline is used for conveying oil; the motor is used for providing power to enable the gear pump to pump oil. The flow switch is used for detecting pipeline oil and sending a signal to stop the motor when no fluid exists; the flow meter is used for starting the motor and metering oil products, and when the oil products passing through the flow meter reach the preset oil quantity, a motor stopping signal is sent; the oil gun is used for outputting oil and controlling the oil to flow. The device can optimize the filling process of lubricating oil and hydraulic oil of the engineering truck transmission case and improve the operation efficiency, accuracy and safety.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of oiling, in particular to an oiling device for engineering vehicle transmission case lubricating oil and hydraulic oil. BACKGROUND

[0002] In the field of engineering machinery, the filling of transmission case lubricating oil and hydraulic oil is an indispensable part of daily maintenance, which is directly related to the operation efficiency and service life of the equipment. With the improvement of mechanization, how to efficiently and accurately manage the filling of these oil products has become an important issue in engineering maintenance.

[0003] At present, the addition of transmission case lubricating oil and hydraulic oil in engineering vehicles mainly relies on manual oil pumps. The operating personnel extracts oil from the oil drum and injects it into the equipment by manually operating the oil pump. However, this mode has significant problems. First, the power of the manual oil pump comes entirely from human power. In the face of the demand for single filling volume between 140L and 700L, the average flow rate of manual operation is only about 3L / min, resulting in long operation time and low efficiency. Second, the manual oil pump lacks precise metering function and can only rely on estimation to determine the filling volume, which is often inaccurate. Third, manual operation cannot guarantee the stability of the output flow, and the demand for flow rate of the equipment is constant, so it is easy to cause oil overflow and increase the risk of operation. In addition, the manual oil pump has a high failure rate, and the connection between the operating handle and the pump body is easy to damage, which poses a threat to the safety of the operating personnel. Finally, this oiling method requires a large number of human resources, affecting the performance of other responsibilities of the team.

[0004] Therefore, how to optimize the filling process of transmission case lubricating oil and hydraulic oil in engineering vehicles, improve the operation efficiency, accuracy and safety has become a technical problem to be solved. CONTENT OF THE INVENTION

[0005] In order to solve the above problems, the application provides an oiling device for transmission case lubricating oil and hydraulic oil in engineering vehicles, which can optimize the filling process of transmission case lubricating oil and hydraulic oil in engineering vehicles, improve the operation efficiency, accuracy and safety.

[0006] The application is implemented as follows:

[0007] The application provides a refueling device for lubricating oil and hydraulic oil of a construction vehicle transmission case, which comprises an oil tank, a pipeline, a flow switch, a gear pump, a motor, a flow meter and an oil gun. The oil tank is connected with the gear pump, the flow meter and the oil gun in sequence through the pipeline, the flow switch is arranged on the pipeline between the oil tank and the gear pump, and the power input end of the gear pump is connected with the output shaft of the motor. The oil tank is used for storing oil products including lubricating oil or hydraulic oil; the pipeline is used for transmitting oil products; the motor is used for providing rotating power so that the gear pump can extract oil products; the flow switch is used for detecting oil products in the pipeline, sending a feedback signal of no fluid to the control circuit of the motor when no fluid passes through the pipeline, so that the motor stops; the flow meter is used for sending a start or stop signal to the control circuit of the motor, so that the motor starts or stops, and is used for measuring the amount of oil products and sending a stop signal to the control circuit of the motor when the amount of oil products reaches a preset oil amount, so that the motor stops; and the oil gun is used for outputting oil products and controlling the outflow or interruption of oil products.

[0008] In some implementations of the application, the refueling device further comprises a frequency converter connected between the motor and an external power source, which is used for controlling the start / stop of the motor and adjusting the rotating speed of the motor, so as to control the rotating speed of the gear pump.

[0009] In some implementations of the application, the control circuit comprises a frequency converter, a contactor KM, a contactor KM1, a contactor KM2, circuit breakers QF1, QF2, QF3, QF4, QF5, QF6, a transformer, a rectifier, time relays KT and KT1 and a remote control switch. The motor is connected with an external power source in sequence through the contactor KM2, the contactor KM1, the contactor KM, the frequency converter and the circuit breaker QF1; the input end of the transformer is connected with the external power source through the circuit breaker QF2, the output end is connected with the circuit breaker QF3 through the rectifier, the circuit breaker QF3 is connected with the flow meter through the circuit breaker QF4, the circuit breaker QF3 is also connected with the flow meter through the circuit breaker QF5, the circuit breaker QF3 is also connected with the contactor KM2 in sequence through the circuit breaker QF7 and the remote control switch, the circuit breaker QF3 is also connected with the flow switch in sequence through the contactor KM1 and the time relay KT1, and the circuit breaker QF3 is also connected with the flow switch through the time relay KT.

[0010] In some implementations of the application, the circuit breakers QF4 and QF5 constitute a redundant control channel; when the flow meter fails, the circuit breaker QF5 is opened and the circuit breaker QF4 is closed, so that the flow meter is bypassed and the contactor KM is supplied with power directly, and the motor resumes operation.

[0011] In some implementations of the present application, when the remote control switch is closed, the contactor KM2 electromagnet is powered, and its main contact is opened to stop the motor; when the remote control switch is opened, the contactor KM2 electromagnet loses power, and its main contact is closed to restore the motor operation.

[0012] In some implementations of the present application, the time relay KT and the time relay KT1 are used to control the power access timing of the flow switch; the normally open contact of the time relay KT is closed 12 seconds after the motor starts to power the flow switch; the normally open contact of the time relay KT1 is closed 15 seconds after the motor starts to make the feedback signal of the flow switch act on the contactor KM1.

[0013] Compared with the prior art, the present application has at least the following advantages or beneficial effects:

[0014] The present application provides an oil filling device for engineering vehicle transmission case lubricating oil and hydraulic oil. Firstly, an organic combination of an oil drum, a pipeline, a gear pump, a motor, a flowmeter and an oil gun forms a complete oil filling device. The motor provides power to drive the gear pump, and the gear pump is responsible for pumping oil from the oil drum and transmitting it to the oil gun through the pipeline, realizing the automation of the oil filling process and reducing the tediousness of manual operation. Secondly, the setting of the flow switch and the flowmeter further improves the accuracy and safety of oil filling. The flow switch can monitor the oil flow in the pipeline in real time, and once there is no fluid passing through the pipeline, it sends a feedback signal to the motor control circuit to stop the motor, avoiding energy waste. The flowmeter can accurately measure the amount of oil, and when the amount of oil reaches the preset amount, it sends a stop signal to the motor control circuit to ensure the accuracy of the oil filling amount. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0016] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of the oil filling device for engineering vehicle transmission case lubricating oil and hydraulic oil of the present application;

[0017] Figure 2 FIG. 2 is a circuit principle diagram of the control circuit of an embodiment of the oil filling device for engineering vehicle transmission case lubricating oil and hydraulic oil of the present application.

[0018] FIG. 1 is a structural schematic diagram of an embodiment of the oil filling device for engineering vehicle transmission case lubricating oil and hydraulic oil of the present application; DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Generally, the components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0021] Embodiment:

[0022] The embodiments of the present application will be described below in detail with reference to the accompanying drawings. Each of the following embodiments and each feature in the embodiments can be combined with each other without conflict.

[0023] In the field of engineering machinery, the filling of transmission case lubricating oil and hydraulic oil is a key link to ensure the operation efficiency and service life of the equipment. However, the existing technology mainly relies on manual oil pump for oiling, which has many defects. After in-depth analysis, the inventors found that the main problems of the existing technology include long operation time, low efficiency, inaccurate filling amount, unstable output flow which easily leads to oil overflow, high failure rate and safety hazards, and the need for a large number of human resources. These problems seriously affect the efficiency and safety of engineering vehicle maintenance, so a more optimized oiling device is needed to solve these problems.

[0024] In view of the defects of the prior art, the present application provides an oiling device for transmission case lubricating oil and hydraulic oil of an engineering vehicle. The device integrates key components such as oil drum 1, pipeline 2, flow switch 3, gear pump 4, motor 5, flow meter 6 and oil gun 7, forming an automatic and accurately controlled oiling system. It can optimize the filling process of the transmission case lubricating oil and hydraulic oil of the engineering vehicle, improve the operation efficiency, accuracy and safety.

[0025] Please refer to Figure 1The oiling device for the transmission case lubricating oil and hydraulic oil of an engineering vehicle comprises an oil tank 1, a pipeline 2, a flow switch 3, a gear pump 4, a motor 5, a flow meter 6 and an oil gun 7. The oil tank 1 is connected with the gear pump 4, the flow meter 6 and the oil gun 7 in sequence through the pipeline 2, the flow switch 3 is arranged on the pipeline 2 between the oil tank 1 and the gear pump 4, and the power input end of the gear pump 4 is connected with the output shaft of the motor 5. The oil tank 1 is used for storing oil products including lubricating oil or hydraulic oil; the pipeline 2 is used for transmitting oil products; the motor 5 is used for providing rotating power so that the gear pump 4 can extract oil products; the flow switch 3 is used for detecting oil products in the pipeline 2, sending a feedback signal of no fluid to the control circuit of the motor 5 when no fluid passes through the pipeline 2, and stopping the motor 5; the flow meter 6 is used for sending a start or stop signal to the control circuit of the motor 5, making the motor 5 start or stop, and measuring the amount of oil products, and sending a stop signal to the control circuit of the motor 5 when the amount of oil products reaches a preset oil amount (the preset oil amount can be set on the flow meter 6), so that the motor 5 stops; and the oil gun 7 is used for outputting oil products and controlling the outflow or interruption of oil products.

[0026] It should be noted that the oil drum 1 as a storage container for oil products needs to be able to hold enough lubricating oil or hydraulic oil to meet the refueling needs of the engineering vehicle. Its design needs to ensure the sealing and stability of the oil products, preventing leakage and contamination. The pipeline 2 is responsible for connecting the oil drum 1, gear pump 4, flow meter 6 and oil gun 7, forming a channel for oil transmission. The pipeline 2 needs to be smooth inside to reduce resistance and ensure smooth transmission of oil. The flow switch 3 is installed on the pipeline 2 between the oil drum 1 and the gear pump 4, used to detect whether there is fluid flowing in the pipeline 2. When there is no fluid in the pipeline 2, the flow switch 3 will send a signal to the control circuit of the motor 5, making the motor 5 stop working, thus avoiding the idling of the gear pump 4 and energy waste. The gear pump 4 is driven by the motor 5, which generates suction and pressure through the rotation of the gear to extract and transmit oil from the oil drum 1 to the subsequent components. It should be noted that the design of the gear pump 4 needs to meet the requirements of high pressure and large flow to ensure the efficiency of oiling. The motor 5 as a power source drives the gear pump 4 to rotate through the output shaft. The control circuit of the motor 5 receives signals from the flow meter 6 and the flow switch 3, controls the start and stop of the motor 5, and realizes the automation of the oiling operation. The flow meter 6 is installed on the pipeline 2 between the gear pump 4 and the oil gun 7, also used to measure the amount of oil transmitted. When the amount of oil reaches the preset value, the flow meter 6 sends a stop signal to the control circuit of the motor 5, making the motor 5 stop working, thus ensuring the accuracy of the oiling amount. At the same time, the flow meter 6 can also send a start signal to the motor 5 control circuit to start the oiling operation. The oil gun 7 as an output unit is used to inject oil into the transmission case of the engineering vehicle. The design of the oil gun 7 needs to meet the requirements of high pressure and large flow, and has the function of controlling the outflow or interruption of oil, to ensure the safety and flexibility of the oiling process.

[0027] When oiling is needed, the operator starts the flow meter 6, which sends a start signal to the motor 5 control circuit, starts the frequency converter, and the motor 5 starts to work, driving the gear pump 4 to rotate. The gear pump 4 extracts oil from the oil drum 1 and transmits it to the flow meter 6 through the pipeline 2. The flow meter 6 measures the amount of oil transmitted, and can also set the amount of oiling to send a stop signal to the motor 5 control circuit when the preset value is reached, making the motor 5 stop working. At the same time, the flow switch 3 sends a signal to the motor 5 control circuit when there is no fluid flowing in the pipeline 2, ensuring that the motor 5 will not idle. The oil gun 7 injects the oil into the equipment after receiving it, and can realize the outflow or interruption of oil through the control function.

[0028] In summary, the above-mentioned embodiment first forms a complete refueling device through the organic combination of the oil tank 1, the pipeline 2, the gear pump 4, the motor 5, the flow meter 6 and the oil gun 7. The motor 5 provides power to drive the gear pump 4, and the gear pump 4 is responsible for extracting oil from the oil tank 1 and transmitting it to the oil gun 7 through the pipeline 2, thereby realizing the automation of the refueling process and reducing the tediousness of manual operation. Secondly, the setting of the flow switch 3 and the flow meter 6 further improves the accuracy and safety of refueling. The flow switch 3 can monitor the oil flow in the pipeline 2 in real time, and once there is no fluid passing through the pipeline 2, it sends a feedback signal to the control circuit of the motor 5 to stop the motor 5, thereby avoiding energy waste. The flow meter 6 can accurately measure the amount of oil, and when the amount of oil reaches the preset oil amount, it sends a stop signal to the control circuit of the motor 5 to ensure the accuracy of the refueling amount.

[0029] In some implementations of the present application, the refueling device further comprises a frequency converter connected between the motor 5 and an external power source, for controlling the start / stop of the motor 5 and adjusting the speed of the motor 5, thereby controlling the speed of the gear pump 4.

[0030] It should be noted that the frequency converter can adjust the input frequency and voltage of the motor 5 in real time according to the preset parameters or external signals, thereby accurately controlling the speed of the motor 5. In the above-mentioned implementation, the frequency converter indirectly controls the speed of the gear pump 4 by adjusting the speed of the motor 5, thereby affecting the extraction and transmission speed of the oil. That is, the addition of the frequency converter makes the refueling speed adjustable. According to actual needs, the operator can accurately control the speed of the gear pump 4 by adjusting the parameters of the frequency converter, thereby meeting the needs of different filling amounts, different oil viscosities or different filling pressures. This flexibility greatly improves the applicability and practicality of the refueling device. Moreover, by adjusting the speed of the motor 5 through the frequency converter, the motor 5 can operate at the best efficiency point, avoiding energy waste that may occur at a fixed speed. In particular, when the filling amount is low, reducing the speed of the motor 5 can significantly reduce energy consumption and operating costs. In addition, the frequency converter can also smoothly adjust the speed of the motor 5, avoiding the impact on the equipment caused by frequent start / stop or sudden acceleration / deceleration of the motor 5, which helps to prolong the service life of the motor 5, the gear pump 4 and other key components. Furthermore, by integrating the frequency converter, the operator can automatically adjust the speed of the motor 5 through simple parameter setting or external signal control, without the need for manual adjustment of the mechanical parts of the motor 5 or the gear pump 4, thereby simplifying the operation process and improving work efficiency.

[0031] Please refer to Figure 2In some implementations of the present application, the control circuit comprises a frequency converter, a contactor KM, a contactor KM1, a contactor KM2, a circuit breaker QF1, a circuit breaker QF2, a circuit breaker QF3, a circuit breaker QF4, a circuit breaker QF5, a circuit breaker QF6, a transformer, a rectifier, a time relay KT, a time relay KT1, and a remote control switch. The motor 5 is connected to an external power source through the contactor KM2, the contactor KM1, the contactor KM, the frequency converter, and the circuit breaker QF1 in sequence. The input end of the transformer is connected to the external power source through the circuit breaker QF2, the output end is connected to the circuit breaker QF3 through the rectifier, the circuit breaker QF3 is connected to the flow meter 6 through the circuit breaker QF4, the circuit breaker QF3 is also connected to the flow meter 6 through the circuit breaker QF5, the circuit breaker QF3 is also connected to the contactor KM2 through the circuit breaker QF7 and the remote control switch in sequence, the circuit breaker QF3 is also connected to the flow switch 3 through the contactor KM1 and the time relay KT1 in sequence, and the circuit breaker QF3 is also connected to the flow switch 3 through the time relay KT.

[0032] In the above implementation, the motor 5 speed is adjusted by the frequency converter, realizing accurate control of the refueling amount and improving the accuracy of refueling operations. The control circuit has multiple protection measures such as circuit breakers and time relays, ensuring the safe operation of the refueling device. At the same time, the flow monitoring and fault handling mechanism effectively prevents accidents caused by flow interruption or equipment failure. The operator can adjust the motor 5 speed according to actual needs to meet different refueling requirements. At the same time, the remote start and stop function improves the flexibility and convenience of refueling operations. Moreover, the circuit components are reasonably arranged, easy to check and maintain. When the flow meter 6 fails, the failure point can be bypassed through simple operation to ensure the normal operation of the refueling device.

[0033] Specifically, the working principle of the circuit includes: (1) starting process: the operator operates the flowmeter 6 start button, the flowmeter 6 feedback signal to the contactor KM, time relay KT, time relay KT1, the contactor KM closes the start of the frequency converter, the motor 5 starts to run. 12 seconds later (the time value is related to the setting of the time relay KT, here is an example for easy understanding), the time relay KT normally open contact closes, the flow switch 3 gets electricity and starts to work; 3 seconds later (the time value is related to the setting of the time relay KT1, here is an example for easy understanding), the time relay KT1 normally open contact closes, the flow switch 3 can feedback signal to the contactor KM1, to realize further control. (2) Speed regulation: by operating the knob on the frequency converter panel, the operator can adjust the motor 5 speed, so as to accurately control the gear pump speed. (3) Stopping process: the motor 5 can be stopped by operating the flowmeter 6 stop switch or the frequency converter stop switch. If the flow is interrupted or disappears, the flow switch 3 makes the contactor KM1 act through the time relay KT1, and the motor 5 stops. (4) Remote start and stop: the operator can control the remote control switch to be closed or opened through the remote controller, so as to realize the remote start and stop of the refueling device. (5) Quantitative refueling: after the flowmeter 6 inputs the required refueling amount, click the start button, when the refueling amount reaches the preset value, the flowmeter 6 feedback signal makes the motor 5 stop. (6) Fault handling: if the flowmeter 6 fails, the frequency converter can be started directly by disconnecting the circuit breaker QF5 and opening the circuit breaker QF4, to ensure that the refueling device can still run.

[0034] In other words, the refueling device for the lubricating oil and hydraulic oil of the engineering truck transmission case is started by the frequency converter and the flowmeter 6, and is stopped by the frequency converter or the flowmeter 6. When working, the operator operates the flowmeter 6, clicks the flowmeter 6 start button, and the flowmeter 6 feedback signal acts on the electromagnet of the contactor KM, the electromagnet of the time relay KT, and the electromagnet of the time relay KT1. The main contact of the contactor KM is closed, the frequency converter is started, the motor 5 starts to run, and after 12 seconds, the normally open contact of the time relay KT is closed, the flow switch 3 gets working power and starts to work. After 3 seconds, the normally open contact of the time relay KT1 is closed, the flow switch 3 can feedback signal to the electromagnet of the contactor KM1, and the knob on the frequency converter panel can adjust the motor 5 speed. When stopping, the flowmeter 6 stop switch can be operated, the flowmeter 6 no longer feedback signal to the electromagnet of the contactor KM, the electromagnet of the contactor KM loses power, the main contact of the contactor KM is disconnected, and the motor 5 stops working, or the motor 5 is directly stopped by operating the stop switch of the frequency converter.

[0035] If the flow in the pipeline 2 is interrupted or disappears when the oil filling device is working, the feedback signal of the flow switch 3 passes through the normally open contact of the time relay KT1, so that the electromagnet of the contactor KM1 is powered on, the main contact of the contactor KM1 is opened, and the motor 5 stops working. At the same time, the oil filling device has a remote start-stop function. During the oil filling process, if the oil level reaches the standard or other unexpected situations occur and the oil filling device needs to be stopped, the operator can control the remote control switch to be closed, the electromagnet of the contactor KM2 is powered on, the main contact of the contactor KM2 is opened, and the motor 5 stops working. If you want to restore the working state of the oil filling device, you only need to control the remote control switch to be opened, the electromagnet of the contactor KM2 is powered off, the main contact of the contactor KM2 is closed again, and the motor 5 can resume work. If the operator needs to add a fixed amount of oil, the required fixed amount of value needs to be input into the flowmeter 6, and then the start button of the flowmeter 6 is clicked. The feedback signal of the flowmeter 6 acts on the electromagnet of the contactor KM, the main contact of the contactor KM is closed, the frequency converter is started, and the motor 5 starts to run. When the oil passing through the flowmeter 6 reaches the preset value, the flowmeter 6 no longer feeds back the signal, the electromagnet of the contactor KM is powered off, and the main contact of the contactor KM is opened, and the motor 5 stops running. If the flowmeter 6 fails to feed back the signal, the circuit breaker QF5 can be opened and the circuit breaker QF4 can be closed, and the electromagnet of the contactor KM can be powered on, and the frequency converter can be started again, and the motor 5 can also run.

[0036] Please refer to Figure 2 In some implementations of the present application, the circuit breaker QF4 and the circuit breaker QF5 constitute a redundant control channel. When the flowmeter 6 fails, the circuit breaker QF5 is opened and the circuit breaker QF4 is closed to bypass the flowmeter 6 and directly supply power to the contactor KM, so that the motor 5 resumes operation.

[0037] It should be noted that in the normal operation mode, the circuit breaker QF5 is in a closed state to provide power for the flowmeter 6, and the flowmeter 6 monitors and adjusts the flow of the medium passing through it, and at the same time sends a control signal to the contactor KM to control the start and stop of the motor 5. When the flowmeter 6 fails and cannot work normally, the oil filling device needs a mechanism to bypass the flowmeter 6 and directly restore the operation of the motor 5. At this time, by opening the circuit breaker QF5 (cutting off the power supply of the faulty flowmeter 6) and then closing the circuit breaker QF4, a new power supply path can be established, which bypasses the flowmeter 6 and directly supplies power to the contactor KM. The contactor KM is an execution element for controlling the motor 5, and its power-on and power-off states determine the start and stop of the motor 5. In the present application, when the bypass power supply path established by QF4 is activated, the contactor KM is powered on, the main contact of the contactor KM is closed, and the motor 5 resumes operation, thereby realizing the non-stop protection of the motor 5 in the case of flowmeter 6 failure.

[0038] Please refer to Figure 2In some implementations of the present application, when the remote control switch is closed, the contactor KM2 electromagnet is powered on, and its main contact is opened to stop the motor 5; when the remote control switch is opened, the contactor KM2 electromagnet loses power, and its main contact is closed to restore the operation of the motor 5.

[0039] In the above implementation, the remote control of the motor 5 start-stop state is mainly realized by the cooperation of the remote control switch and the contactor KM2. Specifically, when the remote control switch is closed, the electromagnet of the contactor KM2 is powered on, causing its main contact to open, thereby cutting off the power supply of the motor 5, and stopping the operation of the motor 5; on the contrary, when the remote control switch is opened, the electromagnet of the contactor KM2 loses power, and the main contact is closed, and the motor 5 regains power supply and resumes operation.

[0040] This design ingeniously utilizes the remote control capability of the remote control switch and the electrical isolation and switching function of the contactor KM2, and realizes the precise control of the motor 5 start-stop state. The core is to convert the human remote operation intention into an electrical signal, and then control the action of the contactor through the electrical signal, and finally realize the control of the power supply of the motor 5.

[0041] That is, remote control is realized through the remote control switch, and the operator does not need to directly touch the motor 5 or the operation panel, thereby reducing the safety risk in the operation process. At the same time, remote operation also improves the flexibility of operation, so that the operator can operate in a wider space range.

[0042] Please refer to Figure 2 In some implementations of the present application, the time relay KT and the time relay KT1 are used to control the power access timing of the flow switch 3; the normally open contact of the time relay KT is closed 12 seconds after the motor 5 starts to supply power to the flow switch 3; the normally open contact of the time relay KT1 is closed 15 seconds after the motor 5 starts to make the feedback signal of the flow switch 3 act on the contactor KM1.

[0043] In the above implementation, the time relay KT is set to close its normally open contact at 12 seconds after the motor 5 is started. This setting ensures that the motor 5 has enough time to reach a steady state of operation before the flow switch 3 is powered. The purpose of this is to avoid potential damage to the flow switch 3 from current fluctuations during the motor 5 start-up, while ensuring that the flow switch 3 only starts working after the motor 5 is in a steady state of operation to accurately monitor the flow. The time relay KT1 is set to close its normally open contact at 15 seconds after the motor 5 is started. At this point, the flow switch 3 has been working for some time and its feedback signal (e.g. normal or abnormal flow signal) is allowed to act on the contactor KM1. The contactor KM1 is a key component of the motor 5 control system and its action will be based on the feedback signal from the flow switch 3 to decide whether to continue maintaining the motor 5 in operation or to take other protective measures.

[0044] Where, when the normally open contact of the time relay KT1 is closed, the feedback signal of the flow switch 3 is transmitted to the contactor KM1 through this path. The contactor KM1 decides whether to maintain or cut off the power supply of the motor 5 according to the type of signal received (normal flow or abnormal flow). This design allows the system to monitor the flow in real time and make corresponding control decisions based on the flow conditions.

[0045] That is, by not powering the flow switch 3 for a delay time (12 seconds) after the motor 5 is started, this solution avoids potential damage to the flow switch 3 from current fluctuations during the motor 5 start-up, extending the service life of the flow switch 3.

[0046] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the claim being invoked.

Claims

1. A device for adding lubricating oil and hydraulic oil to the transmission box of an engineering vehicle, characterized in that, The oil tank, pipeline, flow switch, gear pump, motor, flow meter and oil gun are included. The oil tank is connected with the gear pump, flow meter and oil gun through the pipeline in sequence, the flow switch is arranged on the pipeline between the oil tank and the gear pump, and the power input end of the gear pump is connected with the output shaft of the motor. The oil tank is used for storing oil including lubricating oil or hydraulic oil, the pipeline is used for transmitting oil, the motor is used for providing rotating power so that the gear pump can extract oil, the flow switch is used for detecting oil in the pipeline to send a feedback signal of no fluid to the control circuit of the motor when no fluid passes through the pipeline so as to stop the motor, the flow meter is used for sending a start or stop signal to the control circuit of the motor so as to start or stop the motor, and for measuring the amount of oil and sending a stop signal to the control circuit of the motor when the amount of oil reaches a preset oil amount so as to stop the motor, and the oil gun is used for outputting oil and controlling the outflow or interruption of oil.

2. The refueling device of claim 1, wherein A frequency converter is further included, which is connected between the motor and external power supply and used for controlling the start / stop of the motor and adjusting the rotating speed of the motor so as to control the rotating speed of the gear pump.

3. The fueling device of claim 1, wherein, The control circuit includes a frequency converter, contactor KM, contactor KM1, contactor KM2, circuit breaker QF1, circuit breaker QF2, circuit breaker QF3, circuit breaker QF4, circuit breaker QF5, circuit breaker QF6, transformer, rectifier, time relay KT, time relay KT1 and remote control switch. The motor is connected with external power supply through the contactor KM2, contactor KM1, contactor KM, frequency converter and circuit breaker QF1 in sequence; the input end of the transformer is connected with external power supply through the circuit breaker QF2, the output end is connected with the circuit breaker QF3 through the rectifier, the circuit breaker QF3 is connected with the flow meter through the circuit breaker QF4, the circuit breaker QF3 is also connected with the flow meter through the circuit breaker QF5, the circuit breaker QF3 is also connected with the contactor KM2 through the circuit breaker QF7 and remote control switch in sequence, the circuit breaker QF3 is also connected with the flow switch through the contactor KM1 and time relay KT1 in sequence, and the circuit breaker QF3 is also connected with the flow switch through the time relay KT.

4. The refueling device of claim 3, wherein The circuit breaker QF4 and circuit breaker QF5 constitute a redundant control channel; when the flow meter fails, the circuit breaker QF5 is opened and the circuit breaker QF4 is closed to supply power to the contactor KM directly through the flow meter to make the motor resume operation.

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