Oil quantity detection device of explosion-proof forklift and control method

Abstract

The invention discloses an oil quantity detection device and a control method of an explosion-proof forklift. An oil quantity sensor is arranged in an oil tank and can output an oil quantity signal based on the remaining oil quantity in the oil tank, so that a controller in an explosion-proof tank converts the oil quantity signal into an oil quantity display signal and an oil quantity alarm signal; the oil quantity prompting module arranged on an instrument panel on the back face of the steering wheel of the anti-explosion forklift can display the remaining oil quantity of the oil tank and prompt that the oil quantity is insufficient. The modules are in signal transmission to prompt the remaining oil quantity, so that the oil quantity prompting module can be arranged on the instrument panel on the back face of the steering wheel of the anti-explosion forklift, a driver can conveniently check the remaining oil quantity and refueling in time, and the situation that the anti-explosion forklift flames out due to the fact that the oil quantity in operation of the anti-explosion forklift is insufficient and refueling cannot be conducted in time is avoided; the first safety barrier and the second safety barrier can carry out power amplification processing or power reduction processing on signals among the oil quantity sensor, the controller and the oil quantity prompting module, and safe work of the anti-explosion forklift can be guaranteed.

Description

Technical Field

[0001] The invention relates to the field of explosion-proof forklift control, and in particular to an oil quantity detection device and a control method for an explosion-proof forklift. Background Art

[0002] In the prior art, a mechanical oil gauge is usually used to detect the remaining oil in the forklift tank. Specifically, the float in the mechanical oil gauge is set in the tank. The float will float up and down with the oil level in the tank. The float is essentially a variable resistor. As the oil level drops, the position of the float changes, resulting in an increase in the output resistance, which in turn reduces the output voltage, and the indication on the meter decreases accordingly to display the oil level in the tank. Based on this, the distance between the float and the meter should not be too far. The meter is set at the tank, that is, when it is necessary to check the oil level in the tank, the hood of the explosion-proof forklift needs to be opened to check the meter, which is not convenient for the driver to obtain the remaining oil level in the explosion-proof forklift tank and refuel in time, which may cause the explosion-proof forklift to stall due to insufficient oil during operation. Summary of the invention

[0003] The purpose of the present invention is to provide an oil level detection device and a control method for an explosion-proof forklift. Signals are transmitted between modules to provide a prompt for the remaining oil level, so that the oil level prompt module can be set on the instrument panel on the back of the steering wheel of the explosion-proof forklift, which is convenient for the driver to check the remaining oil level and refuel in time, thereby avoiding the explosion-proof forklift being stalled due to insufficient oil and failure to refuel in time during operation. The first safety barrier and the second safety barrier can perform power amplification or power reduction processing on the signals between the oil level sensor, the controller and the oil level prompt module, and can also ensure the safe operation of the explosion-proof forklift.

[0004] In order to solve the above technical problems, the present invention provides an oil level detection device for an explosion-proof forklift, which is applied to an explosion-proof forklift and includes:

[0005] an oil level sensor, disposed in the oil tank, for outputting an oil level signal based on the remaining oil level in the oil tank;

[0006] A first safety barrier disposed between the oil level sensor and the controller, for performing power amplification processing on the oil level signal;

[0007] The controller, whose input end is connected to the output end of the oil level sensor and is arranged in the explosion-proof box, is used to convert the amplified oil level signal into an oil level display signal, and output an oil level alarm signal when it is determined based on the amplified oil level signal that the remaining oil level in the oil tank is not greater than a preset minimum oil level value;

[0008] A second safety barrier disposed between the controller and the oil level prompt module, for reducing the signal power of the oil level display signal and the oil level alarm signal;

[0009] The input end is connected to the output end of the controller, and the oil level prompt module is arranged on the instrument panel on the back of the steering wheel of the explosion-proof forklift, and is used to display the remaining oil level of the oil when receiving the oil level display signal after the power reduction processing, and to provide an insufficient oil level prompt when receiving the oil level alarm signal after the power reduction processing.

[0010] Preferably, the oil level sensor comprises:

[0011] a variable resistor, a first end of which is connected to a first end of the vehicle-mounted power supply, and a second end of which is connected to a first end of the current detection module, and is used to change its resistance value according to the amount of remaining oil in the oil tank; the resistance value of the variable resistor is negatively correlated with the amount of remaining oil in the oil tank;

[0012] The current detection module has a second end connected to the second end of the vehicle power supply, and an output end connected to the input end of the controller, and is used to detect the current passing through the variable resistor and transmit the current as the oil level signal to the controller.

[0013] Preferably, the controller is specifically used to convert the current output by the current detection module after power amplification processing into an oil level display signal, and output an oil level alarm signal when the current output by the current detection module after power amplification processing is not greater than a preset minimum current, and the preset minimum current is a current threshold set based on the preset oil level minimum value.

[0014] Preferably, the power supply end of the controller and the oil level prompt module is connected to the first end of the key switch, and the second end of the key switch is connected to the vehicle power supply;

[0015] The controller is also used to convert the fuel level signal after power amplification into a fuel level display signal after the key switch is turned on and the vehicle-mounted power supply supplies power to itself, and output a fuel level alarm signal when it is determined based on the fuel level signal after power amplification that the remaining fuel level in the fuel tank is not greater than a preset minimum fuel level value;

[0016] The fuel level prompt module is also used to display the remaining fuel level when receiving the fuel level display signal after the power reduction processing after the key switch is turned on and the vehicle power supply is used to power itself, and to provide a fuel shortage prompt when receiving the fuel level alarm signal after the power reduction processing.

[0017] Preferably, it also includes:

[0018] The fuse, whose first end is connected to the controller and the power supply end of the oil level prompt module and whose second end is connected to the first end of the key switch, is used to melt when the current flowing through itself is greater than a preset current.

[0019] Preferably, the oil level prompt module includes:

[0020] A fuel meter, used for displaying the remaining fuel amount of the fuel meter upon receiving the fuel display signal after the power reduction process;

[0021] The oil level lamp is used to light up when receiving the oil level alarm signal after the power reduction process to provide an indication of insufficient oil level.

[0022] Preferably, it also includes:

[0023] The input end is connected to the output end of the controller and is arranged on the outside of the explosion-proof forklift. The oil alarm module is used to issue an oil shortage alarm when receiving the oil alarm signal after the power reduction process.

[0024] In order to solve the above technical problems, the present application also provides a control method of an explosion-proof forklift, which is applied to the oil level detection device of the explosion-proof forklift as described above. The control method of the explosion-proof forklift includes:

[0025] After determining that the remaining oil volume in the oil tank is not greater than a preset minimum oil volume value and a preset time has passed, the explosion-proof forklift is controlled to shut down.

[0026] Preferably, after the controller determines that the remaining oil amount in the oil tank is not greater than a preset minimum oil amount value and a preset time has passed, the explosion-proof forklift is controlled to shut down, including:

[0027] When it is determined that the remaining oil amount in the oil tank is not greater than a preset minimum oil amount value, and after a preset time has passed, if the remaining oil amount in the oil tank is still not greater than the preset minimum oil amount value, the explosion-proof forklift is controlled to shut down.

[0028] Preferably, it also includes:

[0029] When it is determined that the temperature of the fuel tank is not less than a preset temperature threshold, the explosion-proof forklift is controlled to shut down.

[0030] The present application provides an oil level detection device and control method for an explosion-proof forklift, wherein an oil level sensor is arranged in a fuel tank, and can output an oil level signal based on the remaining oil level in the fuel tank, so that the controller in the explosion-proof box converts the oil level signal into an oil level display signal and an oil level alarm signal, and an oil level prompt module arranged at the instrument panel on the back of the steering wheel of the explosion-proof forklift can display the remaining oil level in the fuel tank and provide an insufficient oil level prompt. In the present application, the modules are connected through signal transmission to provide a remaining oil level prompt, so that the oil level prompt module can be arranged at the instrument panel on the back of the steering wheel of the explosion-proof forklift, which is convenient for the driver to check the remaining oil level and refuel in time, and avoid the explosion-proof forklift being stalled due to insufficient oil level and failure to refuel in time during operation, and the first safety barrier and the second safety barrier can perform power amplification or power reduction processing on the signal between the oil level sensor, the controller and the oil level prompt module, and can also ensure the safe operation of the explosion-proof forklift. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic structural diagram of an oil level detection device for an explosion-proof forklift provided by the present invention;

[0033] Figure 2 A specific structural schematic diagram of an oil level detection device for an explosion-proof forklift provided by the present invention. DETAILED DESCRIPTION

[0034] The core of the present invention is to provide an oil level detection device and control method for an explosion-proof forklift. Signals are transmitted between modules to provide prompts for the remaining oil level, so that the oil level prompt module can be set on the instrument panel on the back of the steering wheel of the explosion-proof forklift, which is convenient for the driver to check the remaining oil level and refuel in time, thereby avoiding the explosion-proof forklift being stalled due to insufficient oil and failure to refuel in time during operation. The first safety barrier and the second safety barrier can perform power amplification or power reduction processing on the signals between the oil level sensor, the controller and the oil level prompt module, and can also ensure the safe operation of the explosion-proof forklift.

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Please refer to Figure 1 , Figure 1 The present invention provides a schematic structural diagram of an oil level detection device for an explosion-proof forklift, which is applied to an explosion-proof forklift and includes:

[0037] The oil level sensor 1 is arranged in the oil tank and is used to output an oil level signal based on the remaining oil level in the oil tank;

[0038] The first safety barrier L1 disposed between the oil level sensor 1 and the controller 2 is used to amplify the oil level signal;

[0039] The input end is connected to the output end of the oil level sensor 1, and the controller 2 is arranged in the explosion-proof box, and is used to convert the amplified oil level signal into an oil level display signal, and output an oil level alarm signal when it is determined based on the amplified oil level signal that the remaining oil level in the oil tank is not greater than a preset minimum oil level value;

[0040] The second safety barrier L2 disposed between the controller 2 and the oil level prompt module 3 is used to reduce the signal power of the oil level display signal and the oil level alarm signal;

[0041] The input end is connected to the output end of the controller 2, and the oil level prompt module 3 is arranged on the instrument panel on the back of the steering wheel of the explosion-proof forklift, which is used to display the remaining oil level when receiving the oil level display signal after the power reduction processing, and to provide an insufficient oil level prompt when receiving the oil level alarm signal after the power reduction processing.

[0042] In the prior art, the float of the mechanical oil gauge of the explosion-proof forklift is set in the oil tank, and the instrument is set at the oil tank port. The instrument and the float are connected, and the float floats up and down with the amount of oil in the oil tank. The float is equivalent to a variable resistor. The lower the oil level, the greater the distance between the float and the instrument, that is, the greater the resistance value, and the lower the oil volume displayed on the instrument; the higher the oil level, the smaller the distance between the float and the instrument, that is, the smaller the resistance value, and the greater the oil volume displayed on the instrument. This structure of the mechanical oil gauge makes the distance between the float and the instrument not too large. Therefore, the instrument is set at the oil tank port, and the oil tank is usually set under the driver's seat. When the driver wants to check the remaining oil in the explosion-proof forklift tank, he needs to get off the car, open the seat, and check the instrument at the oil tank port. Obviously, this method is not convenient for the driver to determine the remaining oil in the tank in time, and may cause the explosion-proof forklift to stall due to insufficient oil in the tank during operation. At this time, it is not convenient to refuel and the normal operation cannot be guaranteed.

[0043] Based on this, the oil level detection device in the present application includes an oil level sensor 1, a safety barrier L1, a controller 2, a safety barrier L2 and an oil level prompt module 3. Signal transmission is used between each module rather than simple resistance voltage transmission. Therefore, the setting distance between the oil level sensor 1, the safety barrier L1, the controller 2, the safety barrier L2 and the oil level prompt module 3 is not restricted. The oil level sensor 1 can be set in the fuel tank, and the oil level prompt module 3 can be set on the instrument panel on the back of the steering wheel of the explosion-proof forklift, so that the driver can check the remaining oil in the fuel tank and replenish the oil in time when the oil level is insufficient.

[0044] Considering that the oil level detection device in the present application is mainly used in explosion-proof forklifts, in order to perform explosion-proof protection, since the signal power processed by the controller 2 is relatively large, the controller 2 is set in the explosion-proof box, and the oil level signal output by the oil level sensor 1 has a relatively small power, which can be set in the dangerous area of ​​the explosion-proof forklift. The oil level signal is amplified by the first safety barrier L1 and then transmitted to the controller 2 in the explosion-proof box, so that the controller 2 can judge the remaining oil level based on the oil level signal, and after the judgment is completed, the oil level display signal and the oil level alarm signal are transmitted to the second safety barrier L2 for power reduction processing to avoid explosion caused by excessive signal power. The function of the safety barrier is to effectively isolate the field loop signal of the dangerous area (non-intrinsically safe) and the loop signal of the safe area (intrinsically safe), realize bidirectional transmission of electrical signals, and limit the energy transfer from the safe area to the dangerous area caused by faults, thereby reducing the risk of explosion transmission; enhance the anti-interference ability of the detection and control circuit, improve the system reliability, and meet the national standard explosion-proof requirements. It should be noted that the area inside the explosion-proof box is the safe area, and the area outside the explosion-proof box is the dangerous area.

[0045] Among them, the oil level sensor 1 and the first safety barrier L1 are connected through an intrinsically safe energy limiting circuit. The intrinsically safe energy limiting circuit converts the oil level signal output by the oil level sensor 1 into a voltage, such as a direct current of 0.2V-1V, and sends it to the first safety barrier L1 for collection, amplification, calculation and anti-interference processing, and then modulates it into an output isolated current and voltage signal through a transformer between the first safety barrier and the controller, and transmits it to the controller 2.

[0046] It should be noted that the controller 2 and the second safety barrier L2 can transmit signals via a CAN cable, and the second safety barrier L2 and the oil level prompt module 3 can transmit signals via a CAN cable.

[0047] In this embodiment, by providing a flameproof box and connecting the first safety barrier L1 and the second safety barrier L2, the remaining oil amount of the explosion-proof forklift can be detected and displayed while ensuring the safety of the explosion-proof forklift.

[0048] In addition, the fuel level reminder module 3 not only enables the driver to check the remaining fuel level in the fuel tank, but also can provide a fuel shortage reminder when the remaining fuel level in the fuel tank is not greater than the preset minimum fuel level, so that the driver can focus on work and not be distracted to check the remaining fuel level.

[0049] In summary, the oil level sensor 1, the controller 2 and the oil level prompt module 3 in the present application transmit signals to provide prompts for the remaining oil level, so that the oil level prompt module 3 can be set on the instrument panel behind the steering wheel of the explosion-proof forklift, which is convenient for the driver to check the remaining oil level and refuel in time, thereby avoiding the explosion-proof forklift stalling due to insufficient oil and inability to refuel in time during operation.

[0050] Based on the above embodiments:

[0051] Please refer to Figure 2 , Figure 2 A specific structural schematic diagram of an oil level detection device for an explosion-proof forklift provided by the present invention.

[0052] As a preferred embodiment, it also includes:

[0053] The input end is connected to the output end of the controller 2, and the oil level alarm module 4 arranged outside the explosion-proof forklift is used to issue an oil level shortage alarm when receiving an oil level alarm signal.

[0054] In this embodiment, an oil level alarm module 4 can also be arranged outside the explosion-proof forklift. When the driver is not driving the explosion-proof forklift, or the driver does not notice the remaining oil level in the fuel tank, but the remaining oil level is insufficient, it is convenient for personnel outside the explosion-proof forklift to promptly know that the oil level is insufficient and replenish the oil.

[0055] Among them, the oil level alarm module 4 can but is not limited to sound and / or light alarms, wherein the sound alarm can promptly prompt the oil level to be insufficient when the line of sight is obstructed, and the light alarm can promptly prompt the oil level to be insufficient when the environment is noisy, and the selection can be made according to actual needs.

[0056] As a preferred embodiment, the oil level alarm module 4 includes:

[0057] The sound prompt circuit is used to give a sound alarm when receiving the oil alarm signal;

[0058] The light prompt circuit is used to give a light warning when receiving an oil level alarm signal.

[0059] In this embodiment, a sound prompt circuit can be set to give a sound alarm, and a lamp prompt circuit can be set to give a light alarm. The sound prompt circuit and the light prompt circuit can be separated and set in different positions. The sound prompt circuit can be set in the middle of the explosion-proof forklift, and the light prompt circuit can be set on the roof. This application does not limit this, as long as the staff can know that the oil level is low.

[0060] As a preferred embodiment, the sound prompt circuit is a speaker or a buzzer; the light prompt circuit is a display screen or an LED (light-emitting diode) lamp.

[0061] The sound prompt circuit in this embodiment can be a speaker or a buzzer, which is simple to operate and low in cost. The speaker can be set to play different music to prompt the oil level, and the sound frequency of the buzzer can be set to prompt the oil level.

[0062] The light prompt circuit can be a display screen or an LED light. The display screen can not only prompt that the fuel level is low, but also display the remaining fuel level in the tank. Different prompt information can be integrated to provide richer functions. The LED light has a simple structure and is easy to operate. Different prompts can be given by selecting LED lights of different colors. This application does not limit this.

[0063] As a preferred embodiment, the oil level sensor 1 includes:

[0064] A variable resistor, a first end of which is connected to a first end of the vehicle power source E, and a second end of which is connected to a first end of the current detection module, and is used to change its resistance value according to the amount of remaining oil in the fuel tank; the resistance value of the variable resistor is negatively correlated with the amount of remaining oil in the fuel tank;

[0065] The current detection module has a second end connected to the second end of the vehicle power supply E, and an output end connected to the input end of the controller 2, and is used to detect the current passing through the variable resistor and transmit the current as an oil level signal to the controller 2.

[0066] In this embodiment, the oil level sensor 1 may specifically include a variable resistor and a current detection module, wherein the variable resistor is arranged in the oil tank. When the oil level in the oil tank is sufficient, the part of the variable resistor above the oil level is smaller, the resistance value of the variable resistor is smaller, the current flowing through the variable resistor is larger, and the current detection module output value controller 2 has a larger current; when the oil level in the oil tank is insufficient, the part of the variable resistor above the oil level is larger, the resistance value of the variable resistor is larger, the current flowing through the variable resistor is smaller, and the current detection module output value controller 2 has a smaller current. When installing the variable resistor, the position where the oil level in the oil tank is the preset minimum oil level can be determined first, and the bottom of the variable resistor is aligned with the preset minimum oil level. When the resistance value of the variable resistor is the maximum, the oil level in the oil tank is the preset minimum oil level, and the controller 2 can determine whether the oil level in the oil tank is insufficient based on this. It should be noted that the preset minimum fuel level is not 0, but can be 10% of the maximum fuel level that can be contained in the fuel tank, so that when the driver finds that the fuel level is insufficient, he can use the remaining fuel to complete the current work and then refill the fuel. Of course, this application does not limit this.

[0067] Among them, the current detection module includes a current detection resistor connected between the variable resistor and the vehicle power supply E, and a current sensor connected in parallel with the current detection resistor. The current detection resistor is connected in series with the variable resistor. Under normal circumstances, the voltage of the vehicle power supply E remains unchanged. Therefore, the current flowing through the current detection resistor is the same as the current flowing through the variable resistor. The current sensor can collect the current flowing through the variable resistor by collecting the current flowing through the current detection resistor. The current detection resistor can be set outside the fuel tank. Of course, this application is not limited to this.

[0068] As a preferred embodiment, the controller 2 is specifically used to convert the current output by the current detection module after power amplification processing into an oil level display signal, and output an oil level alarm signal when the current output by the current detection module after power amplification processing is not greater than a preset minimum current, and the preset minimum current is a current threshold set based on a preset minimum oil level value.

[0069] In this embodiment, the controller 2 specifically determines the resistance of the variable resistor according to the current flowing through the variable resistor, thereby determining the remaining oil in the fuel tank. Specifically, if the oil quantity signal, that is, the current output by the current detection module is not greater than the preset minimum current, it can be determined that the resistance of the variable resistor is large, the part of the variable resistor above the oil level is large, the oil level is low, and the remaining oil in the fuel tank is insufficient, and the fuel needs to be replenished; if the oil quantity signal, that is, the current output by the current detection module is greater than the preset minimum current, it can be determined that the resistance of the variable resistor is not large, the part of the variable resistor above the oil level is not large, the oil level is not low, and the remaining oil in the fuel tank is sufficient, and there is no need to replenish the fuel.

[0070] It should be noted that when setting the preset minimum current, it is set according to the preset minimum value of the oil volume. For example, if the preset minimum value of the oil volume is 10% of the maximum amount of oil that can be contained in the fuel tank, then the preset minimum current is 10% of the maximum current flowing through the variable resistor, and the maximum current flowing through the variable resistor is the current flowing through the variable resistor when the resistance of the variable resistor is the smallest, that is, the amount of oil in the fuel tank is the largest and the oil level is the highest.

[0071] Of course, the current output by the current detection module needs to be amplified by the first safety gate L1 before being transmitted to the controller 2 .

[0072] As a preferred embodiment, the power supply end of the controller 2 and the fuel level prompt module 3 is connected to the first end of the key switch S, and the second end of the key switch S is connected to the vehicle power supply E;

[0073] The controller 2 is also used to convert the fuel level signal after power amplification into a fuel level display signal after the key switch S is turned on and the vehicle power supply E supplies power to itself, and output a fuel level alarm signal when it is determined based on the fuel level signal after power amplification that the remaining fuel level in the fuel tank is not greater than a preset minimum fuel level;

[0074] The fuel level prompt module 3 is also used to display the remaining fuel level when receiving the fuel level display signal after the power reduction processing after the key switch S is turned on and the vehicle power supply E supplies power to itself, and to provide a fuel shortage prompt when receiving the fuel level alarm signal after the power reduction processing.

[0075] In this embodiment, the fuel level prompt module 3 and the controller 2 can be powered by the vehicle-mounted power supply E. When the driver inserts the key into the key switch S and turns on the key switch S, the controller 2 and the fuel level prompt module 3 are powered on, thereby starting to detect and display the remaining fuel level in the fuel tank. That is, the driver only needs to turn on the key switch S to check the remaining fuel level in the fuel tank. The operation is easy, and compared with the controller 2 and the fuel level prompt module 3 with their own power supply, the structure is simpler and the cost is lower.

[0076] In addition, the oil level alarm module 4 can also be powered by the vehicle power supply E to save energy.

[0077] like Figure 2 As shown, the positive pole of the vehicle power supply E is connected to the key switch S, the key switch S is connected to the positive pole of the oil level prompt module 3, the controller 2 and the oil level alarm module 4, and the negative pole is connected to the negative pole of the oil level prompt module 3, the controller 2 and the oil level alarm module 4.

[0078] As a preferred embodiment, it also includes:

[0079] The first end of the fuse FR is connected to the power supply end of the controller 2 and the oil level prompt module 3, and the second end of the fuse FR is connected to the first end of the key switch S, which is used to melt when the current flowing through itself is greater than the preset current.

[0080] In the present application, a fuse FR is also provided between the key switch S and the controller 2 and the oil level prompt module 3 so as to fuse when the current in the circuit is too large, thereby protecting the circuit.

[0081] As a preferred embodiment, the oil level prompt module 3 includes:

[0082] A fuel gauge for displaying the remaining fuel quantity of the fuel upon receiving a fuel quantity display signal after power reduction processing;

[0083] The oil level light is used to light up when receiving the oil level alarm signal after power reduction processing to provide an indication of insufficient oil level.

[0084] In this embodiment, the fuel level prompt module 3 includes a fuel level meter and a fuel level lamp. The fuel level meter can display the remaining fuel level when receiving the fuel level display signal. For example, the fuel level meter is divided into multiple fuel level grids, each grid represents a different fuel level. If the pointer points to the first grid, the remaining fuel level in the fuel tank is not less than 80%, and the pointer points to the second grid, the remaining fuel level in the fuel tank is less than 80% but greater than 70%, and so on. The present application does not limit this. The fuel level lamp can be set next to the fuel level meter, extinguished when the fuel level alarm signal is not received, and lit when the fuel level alarm signal is received, so as to provide a fuel shortage prompt when it is inconvenient for the driver to check the fuel level meter, so that the driver can refill the fuel as soon as possible.

[0085] It should be noted that the oil level alarm signal can be but is not limited to a high level.

[0086] In order to solve the above technical problems, the present application also provides a control method of an explosion-proof forklift, which is applied to the oil level detection device of the above-mentioned explosion-proof forklift. The control method of the explosion-proof forklift includes:

[0087] After determining that the remaining oil volume in the oil tank is not greater than a preset minimum oil volume value and a preset time has passed, the explosion-proof forklift is controlled to shut down.

[0088] As a preferred embodiment, after the controller 2 determines that the remaining oil amount in the oil tank is not greater than a preset minimum oil amount value and a preset time has passed, the explosion-proof forklift is controlled to shut down, including:

[0089] When it is determined that the remaining oil amount in the oil tank is not greater than a preset minimum oil amount value, and after a preset time has passed, if the remaining oil amount in the oil tank is still not greater than the preset minimum oil amount value, the explosion-proof forklift is controlled to shut down.

[0090] In this embodiment, after determining that the remaining oil amount in the fuel tank is not greater than the preset minimum oil amount, in order to protect the explosion-proof forklift, the explosion-proof forklift is also controlled to be shut down to prevent the explosion-proof forklift from continuing to run until the oil in the fuel tank is exhausted, making it inconvenient to refill the oil.

[0091] Alternatively, after determining that the remaining oil amount in the fuel tank is not greater than the preset minimum oil amount value, the explosion-proof forklift will not be immediately controlled to shut down. Instead, after a preset time has passed, it is determined whether the explosion-proof forklift has been refilled with oil after determining that the remaining oil amount in the fuel tank is not greater than the preset minimum oil amount value. By averaging the preset time, the explosion-proof forklift can complete the current work before refilling the oil. However, if the fuel tank has not been refilled with oil and the remaining oil amount in the fuel tank is still not greater than the preset minimum oil amount value, the explosion-proof forklift will be controlled to shut down to prevent the explosion-proof forklift from continuing to run until the oil in the fuel tank is exhausted, making it inconvenient to refill the oil, or to prevent the explosion-proof forklift from being unable to move and affecting the normal progress of other work. If, after determining that the remaining oil amount in the fuel tank is not greater than the preset minimum oil amount value and the explosion-proof forklift has been refilled with oil after the preset time has passed, the explosion-proof forklift will not be automatically controlled to shut down.

[0092] The preset time is determined according to the fuel consumption rate of the explosion-proof forklift and the preset minimum fuel volume, such as 5 minutes. Of course, this application does not limit this.

[0093] It should be noted that the main body for executing the control method of the explosion-proof forklift in the present application may be the controller 2. Of course, the present application does not limit this.

[0094] As a preferred embodiment, it also includes:

[0095] When it is determined that the temperature of the fuel tank is not less than a preset temperature threshold, the explosion-proof forklift is controlled to shut down.

[0096] In this embodiment, if the temperature of the fuel tank is not less than the preset temperature threshold, in order to protect the explosion-proof forklift and the staff, the explosion-proof forklift will be controlled to shut down, that is, the explosion-proof forklift will stop working. After the temperature of the fuel tank drops below the preset temperature threshold, the driver can control the explosion-proof forklift to start.

[0097] Among them, an additional temperature detection module can be set to detect the temperature in the fuel tank, and a temperature detection module can also be set to detect the working environment temperature of the entire explosion-proof forklift. When the working environment temperature of the explosion-proof forklift is not less than the preset working environment temperature threshold, the explosion-proof forklift is also controlled to shut down.

[0098] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0099] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An oil level detection device for an explosion-proof forklift, characterized in that: Applied to explosion-proof forklifts, including: an oil level sensor, disposed in the oil tank, for outputting an oil level signal based on the remaining oil level in the oil tank; A first safety barrier disposed between the oil level sensor and the controller, for performing power amplification processing on the oil level signal; The controller, whose input end is connected to the output end of the oil level sensor and is arranged in the explosion-proof box, is used to convert the amplified oil level signal into an oil level display signal, and output an oil level alarm signal when it is determined based on the amplified oil level signal that the remaining oil level in the oil tank is not greater than a preset minimum oil level value; A second safety barrier disposed between the controller and the oil level prompt module, for reducing the signal power of the oil level display signal and the oil level alarm signal; The input end is connected to the output end of the controller, and the oil level prompt module is arranged on the instrument panel on the back of the steering wheel of the explosion-proof forklift, and is used to display the remaining oil level of the oil when receiving the oil level display signal after the power reduction processing, and to provide an insufficient oil level prompt when receiving the oil level alarm signal after the power reduction processing.

2. The oil level detection device for explosion-proof forklift according to claim 1, characterized in that: The oil level sensor comprises: a variable resistor, a first end of which is connected to a first end of the vehicle-mounted power supply, and a second end of which is connected to a first end of the current detection module, and is used to change its resistance value according to the amount of remaining oil in the oil tank; the resistance value of the variable resistor is negatively correlated with the amount of remaining oil in the oil tank; The current detection module has a second end connected to the second end of the vehicle power supply, and an output end connected to the input end of the controller, and is used to detect the current passing through the variable resistor and transmit the current as the oil level signal to the controller.

3. The oil level detection device for explosion-proof forklift according to claim 2, characterized in that: The controller is specifically used to convert the current output by the current detection module after power amplification processing into an oil level display signal, and output an oil level alarm signal when the current output by the current detection module after power amplification processing is not greater than a preset minimum current, and the preset minimum current is a current threshold set based on the preset oil level minimum value.

4. The oil level detection device for explosion-proof forklift according to claim 1, characterized in that: The power supply end of the controller and the oil level prompt module is connected to the first end of the key switch, and the second end of the key switch is connected to the vehicle power supply; The controller is also used to convert the fuel level signal after power amplification into a fuel level display signal after the key switch is turned on and the vehicle-mounted power supply supplies power to itself, and output a fuel level alarm signal when it is determined based on the fuel level signal after power amplification that the remaining fuel level in the fuel tank is not greater than a preset minimum fuel level value; The fuel level prompt module is also used to display the remaining fuel level when receiving the fuel level display signal after the power reduction processing after the key switch is turned on and the vehicle power supply is used to power itself, and to provide a fuel shortage prompt when receiving the fuel level alarm signal after the power reduction processing.

5. The oil level detection device according to claim 4, characterized in that: Also includes: The fuse, whose first end is connected to the controller and the power supply end of the oil level prompt module and whose second end is connected to the first end of the key switch, is used to melt when the current flowing through itself is greater than a preset current.

6. The oil level detection device for explosion-proof forklift according to claim 1, characterized in that: The oil quantity prompt module comprises: A fuel meter, used for displaying the remaining fuel amount of the fuel meter upon receiving the fuel display signal after the power reduction process; The oil level lamp is used to light up when receiving the oil level alarm signal after the power reduction process to provide an indication of insufficient oil level.

7. The oil level detection device for an explosion-proof forklift according to any one of claims 1 to 6, characterized in that: Also includes: The input end is connected to the output end of the controller and is arranged on the outside of the explosion-proof forklift. The oil alarm module is used to issue an oil shortage alarm when receiving the oil alarm signal after the power reduction process.

8. A control method for an explosion-proof forklift, characterized in that: The oil level detection device applied to the explosion-proof forklift according to any one of claims 1 to 7, wherein the control method of the explosion-proof forklift comprises: After determining that the remaining oil volume in the oil tank is not greater than a preset minimum oil volume value and a preset time has passed, the explosion-proof forklift is controlled to shut down.

9. The control method of an explosion-proof forklift according to claim 8, characterized in that: After the controller determines that the remaining oil in the oil tank is not greater than the preset minimum oil volume and the preset time has passed, the explosion-proof forklift is controlled to shut down, including: When it is determined that the remaining oil amount in the oil tank is not greater than a preset minimum oil amount value, and after a preset time has passed, if the remaining oil amount in the oil tank is still not greater than the preset minimum oil amount value, the explosion-proof forklift is controlled to shut down.

10. The control method of an explosion-proof forklift according to claim 8, characterized in that: Also includes: When it is determined that the temperature of the fuel tank is not less than a preset temperature threshold, the explosion-proof forklift is controlled to shut down.

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