Novel lubricating device for gantry crane

Abstract

The utility model provides a novel lubricating device for a gantry crane, and belongs to the technical field of lubricating control. The novel lubricating device for the gantry crane comprises a main control module, an oiling machine, an electromagnetic valve, a first temperature detection module, a second temperature detection module, a switch control module and a heating control module, the oiling machine, the electromagnetic valve, the first temperature detection module, the second temperature detection module and the switch control module are all connected with the main control module, and the first temperature detection module is configured to detect the temperature of the lubricated position of the gantry crane; the second temperature detection module is configured to detect the temperature of the working environment where the gantry crane is located; the oiling machine is configured to extract lubricating oil in the oil storage barrel; the heating control module is configured to heat lubricating oil in the oil storage barrel. The lubricating device can improve the lubricating effect of the gantry crane.

Description

Technical Field

[0001] This disclosure relates to the field of lubrication control technology, and in particular to a novel lubrication device for gantry cranes. Background Technology

[0002] Gantry cranes play a vital role in cargo loading and unloading operations; however, lubrication remains a critical factor affecting their performance and lifespan. Traditional lubrication systems often cannot flexibly adjust to actual lubrication conditions and ambient temperature. Insufficient lubrication at lubrication points leads to increased friction and heat generation, affecting normal operation, yet lubrication cannot be replenished promptly. Furthermore, when cranes operate in cold environments, the lubricating oil's fluidity decreases due to low temperatures, resulting in poor lubrication. Utility Model Content

[0003] This disclosure provides a novel lubrication device for gantry cranes to improve the lubrication effect of gantry cranes.

[0004] This disclosure provides a novel lubrication device for a gantry crane, comprising: a main control module, a fuel dispenser, a solenoid valve, a first temperature detection module, a second temperature detection module, a switch control module, and a heating control module;

[0005] The first temperature detection module is connected to the main control module, and the first temperature detection module is configured to detect the temperature of the lubricated part of the gantry crane;

[0006] The second temperature detection module is connected to the main control module, and the second temperature detection module is configured to detect the ambient temperature of the working environment where the gantry crane is located;

[0007] Both the fuel dispenser and the solenoid valve are installed on the fuel supply line. Both the fuel dispenser and the solenoid valve are connected to the main control module. The fuel dispenser is configured to extract lubricating oil from the storage tank.

[0008] The control terminal of the switch control module is connected to the main control module, the first terminal of the switch control module is connected to the power supply, the second terminal of the switch control module is connected to the power supply terminal of the heating control module, the input terminal of the heating control module is connected to the second temperature detection module, and the heating control module is configured to heat the lubricating oil in the oil storage tank.

[0009] In one exemplary embodiment of this disclosure, the switch control module includes: a switch transistor Q3;

[0010] The control terminal of the switching transistor Q3 is connected to the main control module, the first terminal of the switching transistor Q3 is connected to the VCC power supply, and the second terminal of the switching transistor Q3 is connected to the power supply terminal of the heating control module.

[0011] In one exemplary embodiment of this disclosure, the heating control module includes: a rheostat RP1, a Zener diode D1, an operational amplifier U1, a Zener diode D2, a transistor Q1, a resistor R4, a switching transistor Q2, and a heating device H1;

[0012] The first terminal of the variable resistor RP1 is connected to the second terminal of the switch control module, the power supply terminal of the operational amplifier U1 is connected to the first terminal of the variable resistor RP1, the second terminal of the variable resistor RP1 is grounded, the sliding terminal of the variable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier U1, the inverting input terminal of the operational amplifier U1 is connected to the second temperature detection module, and the output terminal of the operational amplifier U1 is connected to the collector of the transistor Q1.

[0013] The cathode of the Zener diode D2 is connected to the second temperature detection module, the anode of the Zener diode D2 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the control terminal of the switching transistor Q2, the control terminal of the switching transistor Q2 is connected to the power supply terminal of the operational amplifier U1 through the resistor R4, the first terminal of the switching transistor Q2 is connected to the power supply terminal of the operational amplifier U1, the second terminal of the switching transistor Q2 is connected to the first terminal of the heating device H1, and the second terminal of the heating device H1 is grounded.

[0014] In one exemplary embodiment of this disclosure, the heating control module further includes: an optocoupler D3;

[0015] The first input terminal of the optocoupler D3 is connected to the second terminal of the switching transistor Q2, and the second input terminal of the optocoupler D3 is grounded. The first terminal of the heating device H1 is connected to the VDD power supply, and the second terminal of the heating device H1 is connected to the first output terminal of the optocoupler D3, and the second output terminal of the optocoupler D3 is grounded.

[0016] In one exemplary embodiment of this disclosure, it further includes: a flow meter;

[0017] The flow meter is installed on the oil supply line and is connected to the main control module. The flow meter is configured to detect the amount of oil supplied to the lubricated part of the gantry crane.

[0018] In one exemplary embodiment of this disclosure, it further includes: an oil level detection module;

[0019] The oil level detection module is connected to the main control module, and the oil level detection module is configured to detect the oil level of lubricating oil in the oil storage tank.

[0020] In one exemplary embodiment of this disclosure, it further includes: a wireless communication module and a remote terminal;

[0021] The main control module communicates with the remote terminal through the wireless communication module.

[0022] The beneficial effects of the novel lubrication device for gantry cranes provided in this disclosure are as follows: Through the cooperation of a first temperature detection module and a main control module, the temperature of the lubricated area can be monitored in real time. When insufficient lubrication causes frictional heat and a temperature rise, the device can promptly control the operation of the oil dispenser and solenoid valve to ensure the on-demand supply of lubricating oil and prevent lubrication problems from affecting the normal operation of the crane. Secondly, the second temperature detection module can detect the ambient temperature. In low-temperature environments, the lubricating oil in the storage tank is heated through a switch control module and a heating control module, overcoming the problem of poor lubricating oil flow caused by low temperatures and ensuring lubrication effectiveness. This disclosure achieves precise control of the lubrication process, which not only extends the service life of the gantry crane but also improves its working efficiency and reliability, reduces the risk of equipment failure caused by poor lubrication, and enhances the applicability and safety of the crane under different working conditions and environments. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a novel lubrication device for a gantry crane provided in an embodiment of this disclosure;

[0025] Figure 2 This is a circuit diagram of a novel lubrication device for a gantry crane provided in this embodiment;

[0026] Figure 3 This is a schematic diagram of another novel lubrication device for a gantry crane provided in this embodiment. Detailed Implementation

[0027] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0028] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0029] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0030] Figure 1 This is a structural schematic diagram of a novel lubrication device for a gantry crane provided in an embodiment of this disclosure. (Refer to...) Figure 1 The new lubrication device for a gantry crane includes: a main control module, a fuel dispenser, a solenoid valve, a first temperature detection module, a second temperature detection module, a switch control module, and a heating control module;

[0031] The first temperature detection module is connected to the main control module and is configured to detect the temperature of the lubricated part of the gantry crane.

[0032] The second temperature detection module is connected to the main control module and is configured to detect the ambient temperature of the working environment where the gantry crane is located.

[0033] Both the fuel dispenser and the solenoid valve are installed on the fuel supply line. Both the fuel dispenser and the solenoid valve are connected to the main control module. The fuel dispenser is configured to extract lubricating oil from the oil storage tank.

[0034] The control terminal of the switch control module is connected to the main control module, the first terminal of the switch control module is connected to the power supply, the second terminal of the switch control module is connected to the power supply terminal of the heating control module, and the input terminal of the heating control module is connected to the second temperature detection module. The heating control module is configured to heat the lubricating oil in the oil storage tank.

[0035] In this embodiment, if the lubricated area lacks lubricating oil, the gantry crane will experience increased friction during operation, leading to heat generation and a rise in temperature. Failure to add lubricating oil in a timely manner may affect the normal operation of the gantry crane. The first temperature detection module is used to detect the temperature of the lubricated areas of the gantry crane, such as the motor shaft position and component connections. The first temperature detection module can convert the detected temperature signal into a suitable electrical signal and send it to the main control module. The first temperature detection module can achieve temperature detection using technologies such as infrared sensors or thermistors.

[0036] Both the fuel dispenser and the solenoid valve are located on the fuel supply line. The fuel dispenser draws lubricating oil from the storage tank. The main control module controls the fuel dispenser's operation based on the signal output from the first temperature detection module. The main control module can determine the need for lubricating oil based on the voltage signal output from the first temperature detection module, thus controlling the fuel dispenser's operation. When the first temperature detection module detects that the temperature at the lubrication point exceeds a preset value, the main control module can start the fuel dispenser to draw lubricating oil from the storage tank. The solenoid valve's on / off state can be controlled by the main control module, thereby controlling the flow path and speed of the lubricating oil, regulating the lubricating oil supply, and ensuring that the lubricating oil accurately and appropriately reaches the location requiring lubrication.

[0037] If a gantry crane operates in a very cold environment, the lubricating oil's fluidity will decrease due to the low temperature, affecting lubrication performance. The second temperature detection module can detect the ambient temperature of the gantry crane's operating environment and convert the detected temperature signal into a corresponding electrical signal, which is then sent to the main control module. The second temperature detection module can also achieve temperature detection using technologies such as infrared sensors or thermistors.

[0038] When the second temperature detection module detects that the crane is in an extremely cold environment (too low temperature), the heating control module will heat the lubricating oil in the oil tank because low temperatures reduce the fluidity of the lubricating oil and affect its lubrication effect. At this time, the main control module will send a control command to the switch control module, which will then control the heating control module to turn on the power supply, ensuring that the lubricating oil maintains good fluidity even in low-temperature environments, thereby ensuring that the lubrication device can function normally under different ambient temperatures.

[0039] For example, suppose a gantry crane is carrying out cargo loading and unloading operations at a port.

[0040] The first temperature detection module continuously monitors the temperature at the crane motor shaft, assuming that the temperature at this location remains around 40°C during normal operation. The main control module receives the temperature signal from the first temperature detection module and compares it with a preset normal operating temperature range (e.g., 35°C-45°C). As long as the temperature is within this range, the main control module considers the lubrication condition to be good and does not send operating commands to the lubrication pump and solenoid valve.

[0041] As the operation progresses, due to various reasons (such as lubricant consumption or leakage), insufficient lubrication occurs at the motor shaft, increasing friction. The first temperature detection module detects that the temperature at this location has risen to 55°C and converts this temperature signal into an electrical signal, which is then sent to the main control module. Upon receiving the signal, the main control module activates the refueling machine to draw lubricating oil from the storage tank. Simultaneously, the main control module opens the solenoid valve, allowing lubricating oil to flow along the supply pipe to the motor shaft for lubrication. As lubricating oil is replenished, friction decreases, and the temperature at the motor shaft gradually decreases. When it returns to the normal range, the main control module shuts off the refueling machine and the solenoid valve, stopping the supply of lubricating oil.

[0042] The second temperature detection module detected that the operating environment temperature of the crane was -20°C. The main control module received this ambient temperature signal and compared it with a preset low-temperature threshold (e.g., -10°C). Finding that the ambient temperature was too low, potentially affecting the fluidity of the lubricating oil, the main control module activated the heating control module via the switch control module to heat the lubricating oil in the storage tank. The heating control module then began working, heating the lubricating oil in the storage tank to improve its fluidity and ensure it could be properly drawn and delivered by the refueling machine. When the second temperature detection module detected that the ambient temperature had risen back to a suitable temperature (e.g., 0°C), the main control module deactivated the heating control module via the switch control module.

[0043] As can be seen from the above, this embodiment, through the cooperation of the first temperature detection module and the main control module, can monitor the temperature of the lubricated area in real time. When insufficient lubrication causes frictional heat and a rise in temperature, it can promptly control the operation of the oil dispenser and solenoid valve to ensure the on-demand supply of lubricating oil and avoid affecting the normal operation of the crane due to lubrication problems. Secondly, the second temperature detection module can detect the ambient temperature. In low-temperature environments, the lubricating oil in the oil storage tank is heated through the switch control module and the heating control module, overcoming the problem of poor lubricating oil flow caused by low temperatures and ensuring the lubrication effect. This embodiment achieves precise control of the lubrication process, which not only extends the service life of the gantry crane but also improves its working efficiency and reliability, reduces the risk of equipment failure caused by poor lubrication, and enhances the applicability and safety of the crane under different working conditions and environments.

[0044] like Figure 2 As shown, in one embodiment of this disclosure, the switch control module includes: a switch transistor Q3; the control terminal of the switch transistor Q3 is connected to the main control module, the first terminal of the switch transistor Q3 is connected to the VCC power supply, and the second terminal of the switch transistor Q3 is connected to the power supply terminal of the heating control module.

[0045] In this embodiment, the control terminal of the switch Q3 in the switch control module is connected to the main control module. When the ambient temperature detected by the second temperature detection module is lower than the set value, the main control module outputs a high-level signal, and switch Q3 is turned on. Switch Q3 connects the VCC power supply and the power supply terminal of the heating control module, enabling the power supply to the heating control module and thus starting the heating control module to heat the lubricating oil in the oil storage tank. When the ambient temperature detected by the second temperature detection module is higher than the set value, the main control module outputs a low-level signal, switch Q3 is turned off, and the heating control module does not work.

[0046] like Figure 2 As shown, in one embodiment of this disclosure, the heating control module includes: a rheostat RP1, a Zener diode D1, an operational amplifier U1, a Zener diode D2, a transistor Q1, a resistor R4, a switching transistor Q2, and a heating device H1;

[0047] The first terminal of the variable resistor RP1 is connected to the second terminal of the switch control module. The power supply terminal of the operational amplifier U1 is connected to the first terminal of the variable resistor RP1. The second terminal of the variable resistor RP1 is grounded. The sliding terminal of the variable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier U1. The inverting input terminal of the operational amplifier U1 is connected to the second temperature detection module. The output terminal of the operational amplifier U1 is connected to the collector of the transistor Q1.

[0048] The cathode of Zener diode D2 is connected to the second temperature detection module, the anode of Zener diode D2 is connected to the base of transistor Q1, the emitter of transistor Q1 is grounded, the collector of transistor Q1 is connected to the control terminal of switching transistor Q2, the control terminal of switching transistor Q2 is connected to the power supply terminal of operational amplifier U1 through resistor R4, the first terminal of switching transistor Q2 is connected to the power supply terminal of operational amplifier U1, the second terminal of switching transistor Q2 is connected to the first terminal of heating device H1, and the second terminal of heating device H1 is grounded.

[0049] In this embodiment, when the ambient temperature detected by the second temperature detection module is lower than the set value, the switch Q3 is turned on, and the power supply provides power to the heating control module.

[0050] The inverting input of operational amplifier U1 receives the electrical signal output from the second temperature detection module. Operational amplifier U1 forms a comparator circuit, and rheostat RP1 and Zener diode D1 form a voltage regulator circuit, providing a stable reference voltage to the non-inverting input of operational amplifier U1. Operational amplifier U1 compares the electrical signal output from the second temperature detection module with the reference voltage. When the ambient temperature detected by the second temperature detection module is lower than the set value, operational amplifier U1 outputs a high level, and the voltage output by the second temperature detection module is less than the breakdown voltage of Zener diode D2. Zener diode is cut off, transistor Q1 is also cut off, the collector of transistor Q1 is at a high level, and switching transistor Q2 is turned on. At this time, heating device H1 is powered on and begins to heat the lubricating oil in the oil storage tank.

[0051] When the ambient temperature detected by the second temperature detection module is higher than the set value, the operational amplifier U1 outputs a low level, and the voltage output by the second temperature detection module is greater than the breakdown voltage of the Zener diode D2. Zener diode D2 breaks down and conducts, and transistor Q1 also conducts. The collector of transistor Q1 becomes low, and switching transistor Q2 is cut off. Therefore, heating device H1 does not work. Heating device H1 can be implemented using electric heating technology.

[0052] As can be seen from the above, this embodiment uses operational amplifier U1 to construct a comparator circuit, which can accurately compare the output signal of the second temperature detection module with the reference voltage, and precisely control the working state of the heating device according to the relationship between the ambient temperature and the set value. Simultaneously, the Zener diode D2 and transistor Q1 work together to effectively turn the switching transistor Q2 on and off at different temperatures. This allows the heating control module to automatically adjust the operation of the heating device H1 according to the ambient temperature, ensuring that the lubricating oil in the oil tank is heated at low temperatures to improve its fluidity, while automatically stopping heating at high temperatures, ensuring the rational use of energy and enhancing the reliability and adaptability of the lubrication device.

[0053] like Figure 2 As shown, in one embodiment of this disclosure, the heating control module further includes: an optocoupler D3; the first input terminal of the optocoupler D3 is connected to the second terminal of the switching transistor Q2, the second input terminal of the optocoupler D3 is grounded, the first terminal of the heating device H1 is connected to the VDD power supply, the second terminal of the heating device H1 is connected to the first output terminal of the optocoupler D3, and the second output terminal of the optocoupler D3 is grounded.

[0054] In this embodiment, when switch Q2 is turned on and a circuit is formed on the input side of optocoupler D3, its internal LED emits light, causing the phototransistor on the output side of optocoupler D3 to conduct. This forms a complete circuit between the VDD power supply and heating device H1, allowing heating device H1 to connect to the power supply and begin heating the lubricating oil in the oil tank. When switch Q2 is turned off, no current flows through the input side of optocoupler D3, its internal LED does not emit light, and the phototransistor on the output side is also turned off, disconnecting the VDD power supply from heating device H1, and heating device H1 stops working.

[0055] Optocoupler D3 serves as an isolation element, separating the electrical circuits on the input and output sides, preventing the transmission of electrical interference between different circuit sections, and improving the stability and reliability of the system.

[0056] like Figure 3 As shown, in one embodiment of this disclosure, it further includes: a flow meter;

[0057] The flow meter is installed on the oil supply line and connected to the main control module. The flow meter is configured to detect the amount of oil supplied to the lubricated part of the gantry crane.

[0058] In this embodiment, a flow meter is installed on the oil supply line, and its main task is to detect the oil supply to the lubricated parts of the gantry crane. The flow meter measures the flow rate as the lubricating oil flows through the oil supply line. Electromagnetic flow meters, ultrasonic flow meters, etc., can be used.

[0059] The flow meter can convert the flow signal of lubricating oil into a suitable electrical signal and send it to the main control module. The main control module can count the total flow of the lubricated position over a set time period, thereby determining whether the working status of the lubricated position is good.

[0060] As can be seen from the above, by introducing a flow meter, the lubrication device of the gantry crane can more accurately grasp the supply of lubricating oil. It can not only monitor the flow rate of lubricating oil in real time, but also provide maintenance personnel with more information, which helps to discover and solve potential problems in the lubrication system more timely and accurately, thereby improving the operational reliability and service life of the entire gantry crane.

[0061] like Figure 3 As shown, in one embodiment of this disclosure, it further includes: an oil level detection module;

[0062] The oil level detection module is connected to the main control module and is configured to detect the oil level of the lubricating oil in the oil storage tank.

[0063] In this embodiment, the oil level detection module can monitor the lubricating oil level in the storage tank in real time and convert the oil level information into a signal that can be processed by the main control module. After receiving this signal, the main control module can make corresponding decisions based on the oil level information. For example, when the oil level is too low, it may trigger the refueling machine to stop working or issue an alarm signal to prevent equipment failure due to lack of oil and ensure the stable operation of the gantry crane lubrication system and the safety of the equipment.

[0064] like Figure 3 As shown, in one embodiment of this disclosure, it further includes: a wireless communication module and a remote terminal;

[0065] The main control module communicates with the remote terminal via a wireless communication module.

[0066] In this embodiment, the main control module establishes a communication connection with the remote terminal through a wireless communication module. The wireless communication module can employ technologies such as Wi-Fi, Bluetooth, ZigBee, or other wireless communication technologies to enable data transmission between the main control module and the remote terminal.

[0067] By adding wireless communication modules and remote terminals, the lubrication system of the gantry crane is equipped with remote monitoring and management capabilities, which improves the intelligence level of the equipment, helps to achieve more efficient equipment maintenance and management, improves the operating efficiency of the equipment, reduces the workload of on-site maintenance personnel, and lowers the cost of manual maintenance.

[0068] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A novel lubrication device for a gantry crane, characterized in that, include: The system includes a main control module, a fuel dispenser, a solenoid valve, a first temperature detection module, a second temperature detection module, a switch control module, and a heating control module. The first temperature detection module is connected to the main control module, and the first temperature detection module is configured to detect the temperature of the lubricated part of the gantry crane; The second temperature detection module is connected to the main control module, and the second temperature detection module is configured to detect the ambient temperature of the working environment where the gantry crane is located; Both the fuel dispenser and the solenoid valve are installed on the fuel supply line. Both the fuel dispenser and the solenoid valve are connected to the main control module. The fuel dispenser is configured to extract lubricating oil from the storage tank. The control terminal of the switch control module is connected to the main control module, the first terminal of the switch control module is connected to the power supply, the second terminal of the switch control module is connected to the power supply terminal of the heating control module, the input terminal of the heating control module is connected to the second temperature detection module, and the heating control module is configured to heat the lubricating oil in the oil storage tank.

2. The novel lubrication device for a gantry crane as described in claim 1, characterized in that, The switch control module includes: a switch transistor Q3; The control terminal of the switching transistor Q3 is connected to the main control module, the first terminal of the switching transistor Q3 is connected to the VCC power supply, and the second terminal of the switching transistor Q3 is connected to the power supply terminal of the heating control module.

3. The novel lubrication device for a gantry crane as described in claim 1, characterized in that, The heating control module includes: a rheostat RP1, a Zener diode D1, an operational amplifier U1, a Zener diode D2, a transistor Q1, a resistor R4, a switching transistor Q2, and a heating device H1; The first terminal of the variable resistor RP1 is connected to the second terminal of the switch control module, the power supply terminal of the operational amplifier U1 is connected to the first terminal of the variable resistor RP1, the second terminal of the variable resistor RP1 is grounded, the sliding terminal of the variable resistor RP1 is connected to the non-inverting input terminal of the operational amplifier U1, the inverting input terminal of the operational amplifier U1 is connected to the second temperature detection module, and the output terminal of the operational amplifier U1 is connected to the collector of the transistor Q1. The cathode of the Zener diode D2 is connected to the second temperature detection module, the anode of the Zener diode D2 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, the collector of the transistor Q1 is connected to the control terminal of the switching transistor Q2, the control terminal of the switching transistor Q2 is connected to the power supply terminal of the operational amplifier U1 through the resistor R4, the first terminal of the switching transistor Q2 is connected to the power supply terminal of the operational amplifier U1, the second terminal of the switching transistor Q2 is connected to the first terminal of the heating device H1, and the second terminal of the heating device H1 is grounded.

4. A novel lubrication device for a gantry crane as described in claim 3, characterized in that, The heating control module also includes: an optocoupler D3; The first input terminal of the optocoupler D3 is connected to the second terminal of the switching transistor Q2, and the second input terminal of the optocoupler D3 is grounded. The first terminal of the heating device H1 is connected to the VDD power supply, and the second terminal of the heating device H1 is connected to the first output terminal of the optocoupler D3, and the second output terminal of the optocoupler D3 is grounded.

5. A novel lubrication device for a gantry crane as described in claim 1, characterized in that, Also includes: Flow meter; The flow meter is installed on the oil supply line and is connected to the main control module. The flow meter is configured to detect the amount of oil supplied to the lubricated part of the gantry crane.

6. A novel lubrication device for a gantry crane as described in claim 1, characterized in that, Also includes: Oil level detection module; The oil level detection module is connected to the main control module, and the oil level detection module is configured to detect the oil level of lubricating oil in the oil storage tank.

7. A novel lubrication device for a gantry crane as described in claim 1, characterized in that, Also includes: Wireless communication module and remote terminal; The main control module communicates with the remote terminal through the wireless communication module.

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