A gearbox lubricating oil online monitoring method and monitoring device

Abstract

The present invention discloses an online monitoring method and device for lubricating oil in a gearbox, which specifically include: collecting lubricating oil parameter data in a gearbox through a composite oil sensor; transmitting the oil parameter data and performing data preprocessing; calculating the standard value of the oil parameter corresponding to the lubricating oil temperature measured by the sensor; comparing the collected oil parameter value with the standard value to determine the lubricating oil state; increasing the collection frequency, and if it is determined that the lubricating oil is deteriorating, issuing a warning or alarm signal. The present invention can realize online monitoring of lubricating oil in rail transit gearboxes, can timely feedback the use status of the lubricating oil, and greatly improve the intelligence of gearbox operation and maintenance. Maintenance personnel do not need to visually inspect the gearbox lubricating oil, but only need to replace the lubricating oil according to the warning or alarm signal, which can effectively reduce the cost of oil change and avoid excessive oil change or untimely oil change.

Description

Technical Field

[0001] The invention relates to the technical field of lubricating oil product monitoring, and in particular to an online monitoring method and a monitoring device for gear box lubricating oil. Background Art

[0002] Lubricating oil is the "blood" of the gearbox of rail transit vehicles, and its condition directly affects the safety and life of the gearbox. The increase in the operating speed of rail transit vehicles has made the working environment of various vehicle components more complex, and has also put forward higher requirements on the performance of gearbox lubricating oil. The increase in operating mileage makes the lubricating oil more prone to failure.

[0003] Most of the existing online monitoring technologies for lubricating oil in mechanical equipment require the lubricating oil to be pumped out of the gear box of the mechanical equipment through an oil pump or other oil pumping equipment, or a special oil circuit is set up on the mechanical equipment to perform online monitoring of the lubricating oil.

[0004] The structural space of rail transit vehicles is strictly controlled, and the vehicle bogie has a compact structure. The gearbox is an important component of the bogie. Its limits and space have strict requirements, and it is impossible to set up external oil channels or carry large detection equipment. At the same time, rail transit vehicles are high-speed mobile equipment, and they are mostly operated on long and long routes. The line conditions are harsh and the environment is complex and changeable. Therefore, the online oil monitoring device needs to have good adaptability, can work stably under variable and harsh conditions, and can operate stably in the collection and transmission links. During the operation of the vehicle, the gearbox and surrounding components will produce large vibrations, so the online oil monitoring device needs to have good impact and vibration resistance. The gearbox is close to the motor, and electronic equipment such as sensors are prone to electromagnetic interference with the motor. Therefore, the online oil monitoring device needs to have good anti-electromagnetic interference ability and comply with electromagnetic compatibility tests.

[0005] At present, the lubricating oil detection of rail transit gearboxes adopts the maintenance method of manual visual inspection, sampling inspection, and regular replacement. It has the disadvantages of long detection cycle, high detection cost, complicated oil collection work, and manual error.

[0006] The existing patent CN206683719U discloses a high-speed train gearbox and a high-speed train monitoring system. The high-speed train gearbox includes a box body, a lubricating oil monitoring device and an oil status acquisition card; the oil status acquisition card is arranged on the box body, and the lubricating oil monitoring device includes an oil quality monitoring unit for detecting the quality of the lubricating oil in the box body. The oil quality monitoring unit is arranged in the box body and is communicatively connected with the oil status acquisition card.

[0007] The existing patent CN2021104659817 discloses a gearbox oil on-site detection device and method, which mainly include an online oil monitor, a signal processing module, a data communication module, a central control unit, a remote monitoring terminal and a power supply module; the online oil monitor includes: a transmission pipe 1, a filter chamber, a solenoid valve 1, an oil detection box, a solenoid valve 2, a transmission pipe 2; the filter chamber is provided with an anti-clogging filter and a cleaning box; one end of the transmission pipe 1 is connected to the oil circuit of the gearbox to be tested, and the other end is connected to the filter chamber; the oil detection box is connected to the transmission pipe 2; the oil detection box is provided with a contamination detector, a humidity detector, a temperature detector, and a viscosity detector.

[0008] In summary, in order to realize the online monitoring of the lubricating oil status of rail transit gearboxes, it is necessary not only to develop reliable online monitoring equipment for lubricating oil status that does not affect the normal operation of the gearbox, but also to design a matching monitoring strategy based on the operating characteristics of the rail transit gearbox. Summary of the invention

[0009] Based on the above technical problems, the present invention proposes an online monitoring method and device for gearbox lubricating oil to solve the problems of long lubricating oil detection cycle, high detection cost, complex oil collection work and manual errors in rail transit gearboxes in the prior art.

[0010] To achieve the above purpose, the present invention proposes an online monitoring method and monitoring device for gearbox lubricating oil. The specific technical solution is as follows:

[0011] A method for online monitoring of gearbox lubricating oil, characterized in that the method comprises the following steps:

[0012] S1. Collect lubricating oil parameter data in the gearbox of mechanical equipment;

[0013] S2. Transmit data and perform data preprocessing;

[0014] S3. Calculate the standard value of each oil parameter of the lubricating oil corresponding to the lubricating oil temperature measured by the sensor;

[0015] S4. Compare the collected oil parameter values ​​with the standard values ​​to determine the state of the lubricating oil;

[0016] S5. If it is determined in step S4 that the oil is deteriorating, the collection frequency is increased; if it is determined that the lubricating oil is deteriorating, a warning or alarm signal is issued.

[0017] Furthermore, the oil parameters include at least one of temperature, viscosity, density, water activity, water content, dielectric constant, metal element content and acid value.

[0018] Furthermore, in step S3, the sensor measures the lubricating oil temperature value and calculates the standard values ​​of various oil parameters of the lubricating oil at the temperature.

[0019] Furthermore, in step S4, the collected value of the lubricating oil product parameter is compared with the standard value to determine whether the collected value exceeds the standard value or exceeds the allowable deviation percentage. If one or more of them exceeds, it is preliminarily determined that the lubricating oil is deteriorated.

[0020] Furthermore, before step S1, it also includes: obtaining an operating signal of the mechanical device, determining the operating state of the mechanical device, if the mechanical device is in a standby state, obtaining a clock signal of the mechanical device, determining the standby time, and performing collection settings according to the standby time.

[0021] Further, the waiting time and the collection time are set according to the standby time, the waiting time is 10-20 minutes, the collection time is 2-15 minutes, and the sum of the waiting time and the collection time is not greater than the standby time.

[0022] Furthermore, the calculation formula of the standard value of the density ρ is:

[0023] ρ=k ρ ×T 实测 +C ρ

[0024] Among them, T 实测 is the measured temperature of the lubricating oil, k ρ is the slope, C ρ is the intercept, k ρ , C ρ It is a constant, and the constants of different brands of lubricating oil are different.

[0025] Furthermore, the calculation formula for the standard value of the dielectric constant ε is:

[0026] ε=k ε ×T 实测 +C ε

[0027] Among them, T 实测 is the measured temperature of the lubricating oil, k ε is the slope, C ε is the intercept, k ε , C ε It is a constant, and the constants of different brands of lubricating oil are different.

[0028] Furthermore, the calculation formula of the standard value of the viscosity v is:

[0029] log 10 (log 10 (v+0.7))=Cv1 +C v2 ×log 10 (T 实测 +273.15)

[0030] Among them, T 实测 is the measured temperature of the lubricating oil, C v1 , C v2 It is a constant, and the constants of different brands of lubricating oil are different.

[0031] Furthermore, in step S4, the collected values ​​of the water activity, the water content and / or the metal element content are compared with their standard values ​​to determine whether the collected values ​​exceed the standard values.

[0032] Furthermore, in step S4, the deviation percentage between the collected value of the viscosity, the density, the dielectric constant and / or the acid value and the standard value is calculated, and it is determined whether the calculated deviation percentage exceeds the allowable deviation percentage.

[0033] The present invention also provides a gearbox lubricating oil online monitoring device, which is used to implement the above-mentioned gearbox lubricating oil online monitoring method, comprising a gearbox, a composite oil sensor, a connecting line, a connector, a controller and a host computer, wherein the composite oil sensor is installed on the housing of the gearbox, the composite oil sensor is connected to the controller via the connecting line and the connector, and the controller is connected to the host computer;

[0034] The composite oil product sensor is used to collect lubricating oil product parameter data;

[0035] The connecting line is used to transmit the collected data;

[0036] The connector is used to connect the connecting line;

[0037] The controller is used to obtain the operation signal and the clock signal and perform acquisition settings, and at the same time process the acquired data to determine the state of the lubricating oil;

[0038] The host computer is used for human-computer interaction.

[0039] Furthermore, a mounting platform is provided at the bottom or side of the gear box body, and a through hole leading to the interior of the gear box is opened in the middle of the mounting platform.

[0040] Furthermore, an annular flange or a raised threaded ring is arranged in the middle of the composite oil sensor, and the annular flange or the raised threaded ring is fixedly mounted on the mounting sink.

[0041] Furthermore, a plurality of sensing elements are arranged on the probe of the composite oil product sensor, and a protective cover is provided on the outer side of the probe of the composite oil product sensor.

[0042] Furthermore, the connecting line includes a first cable and a second cable, the first cable connects the tail end of the composite oil sensor and one end of the connector, and the second cable connects the controller and the other end of the connector; the connector is a detachable connector, and the detachable connector is installed on the vehicle bogie.

[0043] Furthermore, the controller includes a board and a host box, the board is connected to the second cable, and the host box is connected to the host computer; the board is provided with a data copy interface.

[0044] Based on the above technical solution, the present invention has at least the following beneficial effects:

[0045] 1. The present invention proposes an online monitoring method and device for gearbox lubricating oil, which can realize online monitoring of rail transit gearbox lubricating oil and can timely feedback the usage status of the lubricating oil.

[0046] 2. The present invention proposes an online monitoring method and device for gearbox lubricating oil, which greatly improves the intelligence of gearbox operation and maintenance. Maintenance personnel do not need to perform visual inspection of the gearbox lubricating oil, thereby reducing the economic and labor costs of gearbox operation and maintenance.

[0047] 3. The present invention proposes an online monitoring method and device for gearbox lubricating oil. When an oil failure or an impending failure is detected, the lubricating oil is replaced according to a warning or alarm signal, which can effectively reduce the cost of oil change and avoid excessive or untimely oil change.

[0048] 4. The present invention proposes an online monitoring method and device for gearbox lubricating oil, which can accumulate a large amount of status data on the actual use of lubricating oil, and provide effective data support for the big data intelligent operation and maintenance of the gearbox and even the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0050] Figure 1 A schematic flow chart of a method for online monitoring of lubricating oil in a gearbox proposed by the present invention;

[0051] Figure 2 This is a schematic structural diagram of a gearbox lubricating oil online monitoring device proposed by the present invention;

[0052] Figure 3This is a schematic diagram of the structure of a composite oil sensor in an online monitoring device for lubricating oil in a gearbox proposed by the present invention;

[0053] Figure 4 The present invention is a schematic diagram of the installation of a composite oil product sensor and a gearbox in an online monitoring device for lubricating oil in a gearbox. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0055] The present invention is further described in detail below in conjunction with specific embodiments. These embodiments should not be construed as limiting the scope of protection claimed by the present invention.

[0056] Example 1

[0057] In order to solve the problems of long lubricating oil detection cycle, high detection cost, complicated oil collection work and manual error in rail transit gearboxes in the prior art, the present invention proposes an online monitoring method and detection device for gearbox lubricating oil.

[0058] This embodiment proposes a gearbox lubricating oil online monitoring method, which is specifically described by taking a rail transit vehicle as an example. The monitoring method mainly includes the following steps:

[0059] S1. Collecting lubricating oil parameter data in the gearbox of the vehicle;

[0060] S2. Transmit data and perform data preprocessing;

[0061] S3. Calculate the standard value of each oil parameter of the lubricating oil corresponding to the temperature measured by the sensor;

[0062] S4. Compare the collected oil parameter values ​​with the standard values ​​to determine the state of the lubricating oil;

[0063] S5. If it is determined in step S4 that the oil is deteriorating, the collection frequency is increased; if it is determined that the lubricating oil is deteriorating, a warning or alarm signal is issued.

[0064] Specifically, in step S1, after the lubricating oil monitoring program in the vehicle is started, a data collection instruction is received, and various oil parameters of the lubricating oil in the gearbox are collected through sensor elements. The collected oil parameters include but are not limited to the temperature, viscosity, density, water activity, water content, dielectric constant, metal element particles, acid value, etc. of the lubricating oil.

[0065] In some embodiments, before data collection is performed, it is necessary to determine the running status of the vehicle and perform data collection settings, specifically including: after the lubricant monitoring program is started, the vehicle's running signal is obtained. If the vehicle is in a running state, the running signal is continued to be obtained in real time. If the vehicle is in a parked state, the vehicle's clock signal is obtained, the parking time of the vehicle is determined, and data collection settings are performed according to the parking time, and the waiting time and the collection time are set. In general, online monitoring of lubricant oil products is performed when the vehicle is in a long parking state, such as before the departure station, after parking at the terminal, or after the vehicle is stored.

[0066] The parking time is set to ensure that the lubricating oil is fully cooled and flows back to the bottom of the gearbox, so as to obtain more accurate results. Therefore, the waiting time is set in combination with the parking time. The setting of the collection time needs to be determined according to the needs. The specific setting can take into account the use of the vehicle, the quality and type of the lubricating oil, and the environment. The sum of the waiting time and the collection time is not greater than the standby time. If the standby time is less than the sum of the minimum waiting time and the minimum collection time, the collection setting is not performed.

[0067] Optionally, the setting range of the waiting time is 10-20 minutes, and the setting range of the collection time is 2-15 minutes.

[0068] In other embodiments, the online monitoring control program is not connected to the vehicle control system for communication and cannot obtain the vehicle operation signal. In this case, a fixed clock method is used to collect and monitor data at a fixed time every day; or the maintenance personnel manually start the online monitoring program according to actual conditions.

[0069] Specifically, in step S2, the collected oil parameter data is transmitted and data preprocessing is performed. Data preprocessing mainly includes eliminating abnormal data, data smoothing, and median data selection. The working environment of the lubricating oil online monitoring device is complex and is affected by factors such as vehicle operation, sensor characteristics, and lubricating oil instability. The raw data collected by the composite oil sensor may contain abnormal data, which needs to be eliminated and smoothed. In addition, the amount of data obtained by the composite oil sensor during the collection period is large, and data selection is required before calculation and judgment in subsequent steps can be performed. Data preprocessing specifically includes:

[0070] (1) Eliminate abnormal data: When the sensor is powered on, there may be a short reaction time gap. During this gap, the data measured by the sensor is not the real data of the lubricant, but false data, so it needs to be eliminated. The data in this gap has obvious characteristics and is usually the initial value of the sensor. Therefore, the limiting filter method is used for filtering, setting the upper and lower intervals, limiting the amplitude range, and eliminating false data.

[0071] (2) Data smoothing: Due to factors such as oil instability, the data collected by the sensor may contain abnormal data with jumps, and this part of the jump data needs to be smoothed. Use sliding window filtering, with △ as the window width, take the average value of the data in the window, then slide the window for a certain step length, take the average value again, repeat this step, and get the smoothed data sequence.

[0072] (3) Median data selection: The sensor will collect a large amount of data during the collection period, which cannot be compared one by one, so the data needs to be selected. Taking temperature as the benchmark, take the median at every 0.5°C interval, and take the corresponding values ​​of other monitoring parameters at the median temperature to obtain a limited set of data for comparison and judgment in subsequent steps.

[0073] Specifically, in step S3, since some parameters of the lubricating oil will change with the change of temperature, such as viscosity, density, and dielectric constant, these changes with temperature are the inherent properties of the lubricating oil, not due to the deterioration of the lubricating oil. At the same time, the lubricating oil temperature is not a fixed value during the monitoring process, so it is necessary to calculate the standard values ​​of the viscosity, density, and dielectric constant of the lubricating oil at the measured temperature as a basis for judgment. Obtain the actual temperature T of the lubricating oil collected by the sensor element in step S1 实测 , and then calculate at the actual temperature T 实测 The standard values ​​of lubricating oil viscosity, density and dielectric constant are shown below.

[0074] Among them, the calculation formula of the standard value ρ of the density of lubricating oil is:

[0075] ρ=k ρ ×T 实测 +C ρ

[0076] From the above formula, we can see that when the temperature change is small, the density ρ and temperature T 实测 Approximately a linear relationship. Among them, T 实测 is the measured temperature in °C, and the density ρ in kg / m 3 , k ρ is the slope, ranging from -1 to 0, C ρ is the intercept, ranging from 700 to 1000, k ρ , C ρ It is a constant, and the constants of different brands of lubricating oil are different.

[0077] The calculation formula for the standard value of the dielectric constant ε of lubricating oil is:

[0078] ε=k ε ×T 实测 +C ε

[0079] As can be seen from the above formula, the dielectric constant ε is related to the temperature T 实测 In a linear relationship, T 实测 is the measured temperature, in °C, k ε is the slope, ranging from -0.1 to 0, C ε is the intercept, ranging from 2 to 4, k ε , C ε It is a constant, and the constants of different brands of lubricating oil are different.

[0080] The calculation formula of the standard value v of lubricating oil viscosity is:

[0081] log 10 (log 10 (v+0.7))=C v1 +C v2 ×log 10 (T 实测 +273.15)

[0082] Among them, T 实测 is the measured temperature, in °C v1 Range is 5~12, C v2 The range is -6 to -1, C v1 , C v2 It is a constant, and the constants of different brands of lubricating oil are different.

[0083] Other oil parameters, such as water activity, water content, metal element particles and acid value, are not affected by temperature, and their standard values ​​depend on the brand of lubricant.

[0084] Specifically, in step S4, the values ​​of the oil parameters collected in step S1 are compared with their standard values. For the oil parameters water activity, water content and metal element content, it is directly determined whether each collected value exceeds its standard value. For the oil parameters viscosity, density, dielectric constant and acid value, it is necessary to calculate the deviation percentage of each relevant collected value relative to the standard value, and then determine whether the calculated deviation percentage exceeds its allowable deviation percentage.

[0085] Optionally, the parameter value of viscosity in the oil parameters is allowed to deviate by ±15%, the parameter value of density is allowed to deviate by ±15%, the parameter value of dielectric constant is allowed to deviate by ±10%, the parameter value of acid value is allowed to deviate by ±15% and the acid value is not greater than 4.

[0086] If the above oil parameters do not exceed the standard value or the allowable deviation percentage, it means that the lubricant has not deteriorated and the monitoring is terminated; if one or more of the oil parameters exceed the standard value or the allowable deviation percentage, it is preliminarily judged that the lubricant has deteriorated and the next step is carried out.

[0087] Specifically, in step S5, the frequency of collecting lubricant oil parameters is increased, and lubricant oil monitoring is performed again. If it is finally determined that the lubricant oil has deteriorated and failed, the data and analysis results are transmitted and stored, and a warning or alarm signal is issued to remind maintenance personnel to replace the lubricant oil.

[0088] The gearbox lubricant online monitoring method provided in this embodiment realizes the online monitoring of the lubricant oil of the rail transit gearbox, can timely feedback the use status of the lubricant, effectively reduce the cost of oil change, and avoid excessive oil change or untimely oil change. At the same time, it can accumulate a large amount of actual use status data of the lubricant, and provide effective data support for the big data intelligent operation and maintenance of the gearbox and even the entire vehicle.

[0089] Example 2

[0090] This embodiment provides a gearbox lubricating oil online monitoring device, which is used to implement the gearbox lubricating oil online monitoring method in the above embodiment 1. Figure 2 As shown, the device includes a gearbox 1, a composite oil sensor 2, a connecting line 3, a connector 4, a controller 5 and a host computer 6. The composite oil sensor 2 is mounted on the housing of the gearbox 1, the composite oil sensor 2 is connected to the controller 5 via the connecting line 3 and the connector 4, and the controller 5 is connected to the host computer 6.

[0091] Specifically, the composite oil sensor 2 is installed at the bottom or side of the gear box 1 to ensure that the probe of the composite oil sensor 2 is immersed below the lubricating oil level inside the gear box. Figure 3 As shown, it is an embodiment of the composite oil sensor 2, which includes a probe 21 and a protective cover 22 at the front end, a mounting portion 23 in the middle, a connecting portion 24 at the tail end, and an internal circuit component. Among them, the probe 21 is provided with multiple sensing elements, which can monitor multiple oil parameters, including temperature, viscosity, density, water activity, water content, dielectric constant, metal element particles, acid value, etc., and corresponding sensing elements can be selectively used according to needs. The protective cover 22 is sleeved on the outside of the probe 21 to protect the sensing element on the probe 21 and ensure that the sensing element works stably in the high-speed stirring lubricating oil. The front end and side of the protective cover 22 are provided with multiple small holes. The mounting portion 23 in the middle is an annular flange, and the composite oil sensor 2 is fixedly mounted on the gear box 1 by bolts. The connecting portion 24 at the tail end is connected to the connecting line 3 by a crimping process, which can resist a tensile force of more than 500N and has good waterproof performance and protection level.

[0092] Optionally, the middle mounting portion may also adopt a raised threaded ring and be fixedly mounted on the gear box 1 by threaded connection.

[0093] Specifically, participate Figure 4As shown, a mounting platform 7 is provided on the housing of the gearbox 1 for mounting the composite oil sensor 2. A through hole is provided in the middle of the mounting platform 7, leading to the interior of the gearbox 1. The probe 21 of the composite oil sensor 2 can be fully contacted with the lubricating oil in the gearbox when inserted into the through hole. The diameter of the through hole is slightly larger than the diameter of the probe 21 of the composite oil sensor. The mounting platform 7 is located below the lubricating oil level of the gearbox to ensure that the probe 21 of the composite oil sensor 2 can be completely immersed in the lubricating oil after the composite oil sensor 2 is installed. The design of the mounting platform 7 position has been verified by simulation analysis and experiments to ensure that its strength and performance are not affected, and that the composite oil sensor 2 does not interfere with any components after installation.

[0094] Specifically, the connector is a detachable connector, and the connector includes a male connector 41 and a female connector 42, and the male connector 41 and the female connector 42 are adapted to be connected; the connecting line 3 includes a first cable 31 and a second cable 32, one end of the first cable 31 is connected to the tail end of the composite oil sensor 2, and the other end is connected to the male connector 41 or the female connector 42, and one end of the second cable 32 is connected to the controller 5, and the other end is connected to the female connector 42 or the male connector 41. The first cable 31 is fixed to the housing of the gearbox 1 through a number of wire clips 8, and the second cable 32 is fixed by a wiring harness. The above detachable connection method can be used to separate the equipment during maintenance. In addition, the installation of the composite oil sensor 2, the connecting line 3 and the wire clip 8 will not affect the space and limit of the gearbox 1, there is no need to pump oil or set up additional oil circuits, and it does not affect the performance and structure of the gearbox itself.

[0095] In some specific implementations, the monitoring device is used on rail transit vehicles, the composite oil sensor 2 is installed on the gear box at the bottom of the vehicle, the controller 5 is installed in the control room on the vehicle, and the connector 4 is installed on the bogie of the vehicle.

[0096] Specifically, the controller 5 is used to realize the power supply, data transmission and processing of the composite oil product sensor 2. The controller 5 includes a board and a host box. The board is connected to the second cable 32, and the host box is connected to the host computer 6. The board and the host box communicate through CAN and Ethernet. The data can be transmitted to the host computer through the host box. At the same time, the host box supplies power to the board, and the board supplies power to the composite oil product sensor 2. The board has functions such as data acquisition, processing, and storage, and the built-in data processing program can analyze and judge the collected oil parameter data.

[0097] Optionally, a data copy interface is provided on the board of the controller 5 for maintenance personnel to copy, without access to the host computer system, and data recovery is performed by the maintenance personnel copying data regularly.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0099] It should be noted that, in this article, 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 "include", "comprise" 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, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0100] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by an instruction execution system, apparatus or device (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, apparatus or device and execute instructions), or used in combination with these instruction execution systems, apparatuses or devices.

[0101] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0102] It should be noted that, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A method for online monitoring of gearbox lubricating oil, characterized in that: The method comprises the following steps S1. Collect lubricating oil parameter data in the gearbox of mechanical equipment; S2. Transmit data and perform data preprocessing; S3. Calculate the standard value of each oil parameter of the lubricating oil corresponding to the lubricating oil temperature measured by the sensor; S4. Compare the collected oil parameter values ​​with the standard values ​​to determine the state of the lubricating oil; S5. If it is determined in step S4 that the oil is deteriorating, the sampling frequency is increased; if it is determined that the lubricating oil is deteriorating, a warning or alarm signal is issued.

2. The method for online monitoring of gearbox lubricating oil according to claim 1, characterized in that: The oil parameters include at least one of temperature, viscosity, density, water activity, water content, dielectric constant, metal element content and acid value.

3. The method for online monitoring of gearbox lubricating oil according to claim 2, characterized in that: In step S3, the sensor measures the lubricating oil temperature value and calculates the standard values ​​of various parameters of the lubricating oil at the temperature.

4. The method for online monitoring of gearbox lubricating oil according to claim 3, characterized in that: In step S4, the collected value of the lubricating oil product parameter is compared with the standard value to determine whether the collected value exceeds the standard value or exceeds the allowable deviation percentage. If one or more of them exceeds, it is preliminarily determined that the lubricating oil is deteriorated.

5. The gearbox lubricating oil online monitoring method according to claim 1, characterized in that: Before step S1, it also includes: obtaining the operation signal of the mechanical equipment, judging the operation status of the mechanical equipment, if the mechanical equipment is in a standby state, obtaining the clock signal of the mechanical equipment, judging the standby time, and performing collection settings according to the standby time.

6. The method for online monitoring of gearbox lubricating oil according to claim 5, characterized in that: The waiting time and the collection time are set according to the standby time, the waiting time is 10-20 minutes, the collection time is 2-15 minutes, and the sum of the waiting time and the collection time is not greater than the standby time.

7. The gearbox lubricating oil online monitoring method according to claim 3 is characterized in that: The calculation formula of the standard value of the density ρ is ρ=k ρ ×T 实测 +C ρ Among them, T 实测 is the measured temperature of lubricating oil, k ρ is the slope, C ρ is the intercept, k ρ , C ρ It is a constant, and the constants of different brands of lubricating oil are different.

8. The gearbox lubricating oil online monitoring method according to claim 3 is characterized in that: The calculation formula of the standard value of the dielectric constant ε is ε=k ε ×T 实测 +C ε Among them, T 实测 is the measured temperature of lubricating oil, k ε is the slope, C ε is the intercept, k ε , C ε It is a constant, and the constants of different brands of lubricating oil are different.

9. The gearbox lubricating oil online monitoring method according to claim 3, characterized in that: The calculation formula of the standard value of the viscosity v is: log 10 (log 10 (v+0.7))=C v1 +C v2 ×log 10 (T 实测 +273.15) Among them, T 实测 is the measured temperature, C v1 , C v2 It is a constant, and the constants of different brands of lubricating oil are different.

10. The method for online monitoring of gearbox lubricating oil according to claim 4, characterized in that: In step S4, the collected values ​​of the water activity, the water content and / or the metal element content are compared with their standard values ​​to determine whether the collected values ​​exceed the standard values.

11. The method for online monitoring of gearbox lubricating oil according to claim 4, characterized in that: In step S4, the deviation percentage between the collected value of the viscosity, the density, the dielectric constant and / or the acid value and the standard value is calculated, and it is determined whether the calculated deviation percentage exceeds the allowable deviation percentage.

12. An online monitoring device for gearbox lubricating oil, used to implement the online monitoring method for gearbox lubricating oil according to claims 1-11, characterized in that: It includes a gearbox, a composite oil sensor, a connecting line, a connector, a controller and a host computer, wherein the composite oil sensor is installed on the housing of the gearbox, the composite oil sensor is connected to the controller through the connecting line and the connector, and the controller is connected to the host computer; The composite oil product sensor is used to collect lubricating oil product parameter data; The connecting line is used to transmit the collected data; The connector is used to connect the connecting line; The controller is used to obtain the operation signal and the clock signal and perform acquisition settings, and at the same time process the acquired data to determine the state of the lubricating oil; The host computer is used for human-computer interaction.

13. The gearbox lubricating oil online monitoring device according to claim 12, characterized in that: A mounting sink is provided at the bottom or side of the gear box body, and a through hole leading to the interior of the gear box is opened in the middle of the mounting sink.

14. The gearbox lubricating oil online monitoring device according to claim 13, characterized in that: An annular flange or a raised threaded ring is arranged in the middle of the composite oil sensor, and the annular flange or the raised threaded ring is fixedly mounted on the mounting sink.

15. The gearbox lubricating oil online monitoring device according to any one of claims 12 to 14, characterized in that: A plurality of sensing elements are arranged on the probe of the composite oil product sensor, and a protective cover is sheathed on the outer side of the probe of the composite oil product sensor.

16. The gearbox lubricating oil online monitoring device according to claim 12, characterized in that: The connecting line includes a first cable and a second cable, the first cable connects the tail end of the composite oil sensor and one end of the connector, and the second cable connects the controller and the other end of the connector; The connector is a detachable connector, and the detachable connector is installed on a vehicle bogie.

17. The gearbox lubricating oil online monitoring device according to claim 16, characterized in that: The controller includes a board and a host box. The board is connected to the second cable, and the host box is connected to the host computer. The board is provided with a data copy interface.

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