CN112413098B - Dynamic oil pressure characteristic quantity-based static oil level measuring method for lubricating oil of mining speed reducer - Google Patents
Dynamic oil pressure characteristic quantity-based static oil level measuring method for lubricating oil of mining speed reducer Download PDFInfo
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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- F16H57/00—General details of gearing
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Abstract
The invention discloses a dynamic oil pressure characteristic quantity-based static oil level measuring method for lubricating oil of a mining speed reducer, which is characterized in that a pressure sensor additionally arranged at the bottom of a lubricating oil tank is used for sampling a pressure signal in real time, the backflow condition of the lubricating oil in the static state of the speed reducer is judged by setting a time threshold according to a pressure signal curve, and the current accurate oil level of the lubricating oil is calculated according to pressure and temperature when the backflow of the lubricating oil reaches a stable stage, so that the working condition of a lubricating system is determined, and a basis is provided for monitoring oil leakage faults.
Description
Technical Field
The invention relates to the technical field of lubricating system monitoring, in particular to a dynamic oil pressure characteristic quantity-based static oil level measuring method for lubricating oil of a mining speed reducer.
Background
The scraper conveyor is important transportation equipment for coal mining and mainly used for transporting coal cut by a coal mining machine to a reversed loader. The mining speed reducer is a core component of the scraper conveyor, and because the underground environment is severe and complex, and the speed reducer often bears great dynamic load impact, the requirement on the reliability of the speed reducer is high, and the state of lubricating oil of the speed reducer has important significance on the running condition of equipment and the industrial production process.
At present, about 80 percent of parts in the mining speed reducer are damaged due to abrasion, and the reason for the accelerated abrasion is the abnormity of a lubricating system. Lubricating system is unusual mainly including scarce oil and oil leak, and these two kinds of circumstances all can lead to the reduction gear trouble to take place the probability grow, and gear wear aggravates, influences the working life of reduction gear, and then influences the industrial process, can bring huge economic loss finally, and lack oil and oil leak all can be through the monitoring to the residual oil mass in time discovering, consequently carry out accurate monitoring and key to the residual oil mass of lubricating oil, and the measurement oil level is the simplest effectual method of accurate monitoring residual oil mass. By measuring the oil level, the residual quantity of the lubricating oil can be known, whether the lubricating oil is lack or excessive can be determined, and oil leakage faults can be diagnosed according to the change rate of the oil level, so that the normal operation of a lubricating system of the mining speed reducer is guaranteed, and the method has important significance for guaranteeing the safe operation of the mining speed reducer and prolonging the service life of the mining speed reducer.
The traditional method for measuring the lubricating oil level of the mining speed reducer is generally manually checked, and due to the fact that the working environment of the mining speed reducer is severe, under the condition, large errors can exist in human eye observation, the residual oil quantity of the lubricating oil cannot be accurately monitored, and time and labor are wasted; the liquid level of part of mining reducers is judged by adopting photoelectric sensors, but continuous liquid level values cannot be given, and only state information about whether the liquid level reaches a certain position can be given; in addition, the oil level information of the lubricating oil is directly measured based on a liquid level or pressure sensor, but in the operation process of the mining speed reducer, the lubricating oil can splash due to the high-speed rotation of a main shaft, the splashing process and the fluid impact force of the main shaft can affect the liquid level and the pressure sensor, the measurement result is directly inaccurate, the lubricating oil is attached to each part and each position of the mining speed reducer after splashing, the lubricating oil has a long-time backflow process after the mining speed reducer is stopped, and the error of direct measurement is further increased; meanwhile, the density of the lubricating oil changes remarkably along with the temperature, when the mining speed reducer is shut down, the lubricating oil has a long-time cooling process, the temperature change amount is large, the volume change of the lubricating oil is remarkable, the oil level can also change obviously along with the change of the volume of the lubricating oil, so that the monitoring of the residual oil amount has large deviation, the abnormal probability of the lubricating system is increased, the safe and stable operation of the mining speed reducer cannot be ensured, and the service life of equipment for protecting the mining speed reducer is not favorably prolonged.
In summary, a method for accurately measuring the lubricating oil level of the mining speed reducer on line is urgently needed.
Disclosure of Invention
In order to solve the problems, the invention provides a dynamic oil pressure characteristic quantity-based static oil level measuring method for lubricating oil of a mining speed reducer.
In order to achieve the purpose, the invention adopts the technical scheme that:
a static oil level measuring method of mining speed reducer lubricating oil based on dynamic oil pressure characteristic quantity comprises the following steps:
s1: the pressure sensor installed at the bottom of the reducer gear box continuously measures the dynamic oil pressure of the lubricating oil in the gear box in real time, transmits the measurement information of the dynamic pressure of the lubricating oil to the digital processor once every delta t time, and records the pressure value as pn；
S2: the digital processor determines the current pressure measurement pnWith the last pressure measurement pn-1Whether or not p is satisfiedn-pn-1＞ΔpbackflowIf the first timer is in the stop timing state, starting the first timer to start timing from 0, and if the first timer is in the normal timing state, continuing timing; if not, clearing the current timing value T of the first timer1Setting the first timer to stop timing; when the current timing value T of the first timer1Greater than or equal to TbackflowEntering step 3; wherein, Δ pbackflowThe speed threshold value T of the pressure change of the lubricating oil in the process of returning the lubricating oil after the speed reducer is stoppedbackflowIs a set first time threshold;
s3: the digital processor determines the current pressure measurement pnWith the last pressure measurement pn-1Whether or not | p is satisfiedn-pn-1|≤ΔpstableIf the first timer is in the timing stop state, starting the first timer to start timing from 0, and if the first timer is in the normal timing state, continuing timing; if not, clearing the current timing value T of the second timer2Setting the second timer to stop timing; when the second timer is currently counting time T2Greater than or equal to TstableDetermining the dynamic oil pressure measurement value p at that timestableCorresponding oil pressure for the static oil level of the lubricating oil of the speed reducer; wherein, Δ pstableFor the speed threshold value T of the change of the pressure of the lubricating oil in the stable section after the speed reducer is stopped and the return of the lubricating oil is finishedstableIs a set second time threshold;
s4: measuring the temperature of lubricating oil by using a temperature sensor arranged in a gearbox of the speed reducer, and recording the numerical value of the temperature of the lubricating oil as T0；
S5: oil pressure p corresponding to static oil level of lubricating oil based on speed reducerstableAnd static temperature T of lubricating oil of speed reducer0The static oil level of the lubricating oil in the gearbox of the speed reducer is calculated according to the following formula, and the pressure formula inside the liquid is used as follows:
pstable＝ρstableghstable
in the formula, pstableFor the static oil level of the lubricating oil of the speed reducer, corresponding to the oil pressure, rhostableFor the static temperature T of the lubricating oil of the speed reducer0Lower corresponding density, g is local gravitational acceleration, hstableThe height of the residual oil quantity of the lubricating oil, namely the static oil level of the lubricating oil of the speed reducer, can be obtained by the formula:
the invention is further improved in that the interval time delta t in the step S1 is 30 seconds to 5 minutes according to the return speed of the lubricating oil after the actual speed reducer is stopped.
A further development of the invention is that Δ p in S2backflowThe threshold value of the pressure change speed of the lubricating oil in the lubricating oil backflow process after the speed reducer is stopped is set as the basis for meeting the minimum pressure change speed in the first half of the backflow process; Δ p in S3stableThe setting of the speed threshold value of the pressure change of the lubricating oil in the stable section after the speed reducer is stopped and the lubricating oil is refluxed is determined according to tests, and the value of the speed threshold value is larger than the maximum amount of the pressure change of the lubricating oil in the stable section.
A further development of the invention consists in the first time threshold T in S2backflowThe setting basis is more than half of the time required by the first half of the speed reducer stopping lubricating oil backflow process; second time threshold T in S3stableThe setting time can be selected to be not less than 10 minutes.
Compared with the prior art, the invention has the following advantages:
the traditional method for measuring the lubricating oil level of the mining speed reducer generally adopts manual checking, and adopts methods such as photoelectric sensor monitoring, direct measurement based on a liquid level sensor and a pressure sensor and the like, wherein the manual checking is obviously influenced by severe environment and wastes time and labor; the photoelectric sensor cannot give a continuous liquid level value; the dynamic change characteristic of the lubricating oil level in the running process is not considered when the liquid level and pressure sensors directly measure; meanwhile, the three methods do not consider the volume change of the lubricating oil density along with the temperature change, and the measurement result is inaccurate.
The invention judges the backflow state of the lubricating oil based on the characteristic quantity of the dynamic oil pressure, calculates the static oil level in the stable stage of the backflow, takes the backflow characteristic of the lubricating oil of the speed reducer into consideration, thereby avoiding the measurement error caused by the dynamic change in the oil level measurement process, obtains the real-time density of the lubricating oil by referring to the density-temperature curve of the lubricating oil according to the real-time temperature, corrects the calculation result of the oil level of the lubricating oil, greatly improves the accuracy degree of the measurement compared with the existing oil level measurement method, and can give out continuous liquid level values; meanwhile, the on-site digital processor is utilized to set the threshold values of the relevant parameters, automatic unmanned static oil level measurement is realized, the manpower consumption for manual checking in a severe working environment and large errors caused by manual checking are avoided, the real-time working condition of the mining speed reducer is adapted better, and the practical application value is obvious.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic flow chart of a mining speed reducer lubricating oil static oil level measuring method based on a dynamic oil pressure characteristic quantity according to an embodiment of the invention.
FIG. 2 is a lubricating oil density versus temperature curve for an embodiment of the present invention.
Fig. 3 is a graph of oil mass versus time during oil return at the time of a reduction gear stop according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical effect and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Referring to fig. 1, a method for measuring a static oil level of lubricating oil of a mining speed reducer based on a dynamic oil pressure characteristic quantity includes the following steps:
s1: the pressure sensor installed at the bottom of the reducer gear box continuously measures the dynamic oil pressure of the lubricating oil in the gear box in real time, transmits the measurement information of the dynamic pressure of the lubricating oil to the digital processor once every delta t time, and records the pressure value as pn；
S2: the digital processor determines the current pressure measurement pnWith the last pressure measurement pn-1Whether or not p is satisfiedn-pn-1＞ΔpbackflowIf the first timer is in the stop timing state, starting the first timer to start timing from 0, and if the first timer is in the normal timing state, continuing timing; if not, clearing the current timing value T of the first timer1Setting the first timer to stop timing; when the current timing value T of the first timer1Greater than or equal to TbackflowEntering step 3;
s3: the digital processor determines the current pressure measurement pnWith the last pressure measurement pn-1Whether or not | p is satisfiedn-pn-1|≤ΔpstableIf the first timer is in the timing stop state, starting the first timer to start timing from 0, and if the first timer is in the normal timing state, continuing timing; if not, clearing the current timing value T of the second timer2Setting the second timer to stop timing; when the second timer is currently counting time T2Greater than or equal to TstableDetermining the dynamic oil pressure measurement value p at that timestableIs static oil of lubricating oil of speed reducerThe position corresponds to the oil pressure;
s4: measuring the temperature of lubricating oil by using a temperature sensor arranged in a gearbox of the speed reducer, and recording the numerical value of the temperature of the lubricating oil as T0；
S5: oil pressure p corresponding to static oil level of lubricating oil based on speed reducerstableAnd static temperature T of lubricating oil of speed reducer0The static oil level of the lubricating oil in the gearbox of the speed reducer is calculated according to the following formula, and the pressure formula inside the liquid is used as follows:
pstable＝ρstableghstable
in the formula, pstableFor the static oil level of the lubricating oil of the speed reducer, corresponding to the oil pressure, rhostableFor the static temperature T of the lubricating oil of the speed reducer0Lower corresponding density, g is local gravitational acceleration, hstableThe height of the residual oil quantity of the lubricating oil, namely the static oil level of the lubricating oil of the speed reducer, can be obtained by the formula:
Referring to fig. 3, an oil amount-time curve in a lubricating oil backflow process when the speed reducer according to the embodiment of the present invention is stopped is divided into a fast backflow stage, a slow backflow stage, and a steady stage, and when the backflow process enters the steady stage, an oil level is calculated; wherein, S2, S3 are to distinguish the backflow stage and the plateau stage by the threshold value calculation, and calculate the oil level by S4, S5 in the plateau stage.
According to the method for measuring the static oil level of the lubricating oil of the mining speed reducer based on the dynamic oil pressure characteristic quantity, disclosed by the embodiment of the invention, the value of the interval time delta t in S1 is 30 seconds-5 minutes, and is determined according to the return speed of the lubricating oil after the actual speed reducer is stopped.
The invention embodiment of the invention discloses a dynamic oil pressure characteristic quantity-based static oil level measurement method for lubricating oil of a mining speed reducerMethod, Δ p in S2backflowThe threshold value of the pressure change speed of the lubricating oil in the lubricating oil backflow process after the speed reducer is stopped is set as the basis for meeting the minimum pressure change speed in the first half of the backflow process; Δ p in S3stableThe setting of the speed threshold value of the pressure change of the lubricating oil in the stable section after the speed reducer is stopped and the lubricating oil is refluxed is determined according to tests, and the value of the speed threshold value is larger than the maximum amount of the pressure change of the lubricating oil in the stable section.
The static oil level measuring method of the mining speed reducer lubricating oil based on the dynamic oil pressure characteristic quantity, provided by the embodiment of the invention, is a first time threshold T in S2backflowThe setting basis is more than half of the time required by the first half of the speed reducer stopping lubricating oil backflow process; second time threshold T in S3stableThe setting time can be selected to be not less than 10 minutes.
Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can make modifications and equivalents to the embodiments of the present invention without departing from the spirit and scope of the present invention, which is set forth in the claims of the present application.
Claims (4)
1. A static oil level measuring method of mining speed reducer lubricating oil based on dynamic oil pressure characteristic quantity is characterized by comprising the following steps:
step 1: the pressure sensor installed at the bottom of the reducer gear box continuously measures the dynamic oil pressure of the lubricating oil in the gear box in real time, transmits the measurement information of the dynamic pressure of the lubricating oil to the digital processor once every delta t time, and records the pressure value as pn；
Step 2: the digital processor determines the current pressure measurement pnWith the last pressure measurement pn-1Whether or not p is satisfiedn-pn-1＞ΔpbackflowIf the first timer is satisfied and in the stop timing state, the first timer is started to start timing from 0, and if the first timer is satisfied and in the stop timing state, the first timer is started to start timing from 0If the timer is in a normal timing state, timing is continued; if not, clearing the current timing value T of the first timer1Setting the first timer to stop timing; when the current timing value T of the first timer1Greater than or equal to TbackflowEntering step 3; wherein, Δ pbackflowThe speed threshold value T of the pressure change of the lubricating oil in the process of returning the lubricating oil after the speed reducer is stoppedbackflowIs a set first time threshold;
and step 3: the digital processor determines the current pressure measurement pnWith the last pressure measurement pn-1Whether or not | p is satisfiedn-pn-1|≤ΔpstableIf the first timer is in the timing stop state, starting the first timer to start timing from 0, and if the first timer is in the normal timing state, continuing timing; if not, clearing the current timing value T of the second timer2Setting the second timer to stop timing; when the current timing value T of the timer2Greater than or equal to TstableDetermining the dynamic oil pressure measurement value p at that timestableCorresponding oil pressure for the static oil level of the lubricating oil of the speed reducer; wherein, Δ pstableFor the speed threshold value T of the change of the pressure of the lubricating oil in the stable section after the speed reducer is stopped and the return of the lubricating oil is finishedstableIs a set second time threshold;
and 4, step 4: measuring the temperature of lubricating oil by using a temperature sensor arranged in a gearbox of the speed reducer, and recording the numerical value of the temperature of the lubricating oil as T0；
And 5: oil pressure p corresponding to static oil level of lubricating oil based on speed reducerstableAnd static temperature T of lubricating oil of speed reducer0The static oil level of the lubricating oil in the gearbox of the speed reducer is calculated according to the following formula, and the pressure formula inside the liquid is used as follows:
pstable＝ρstableghstable
in the formula, pstableFor the static oil level of the lubricating oil of the speed reducer, corresponding to the oil pressure, rhostableFor the static temperature T of the lubricating oil of the speed reducer0Lower corresponding density, g is local gravitational acceleration, hstableThe height of the residual oil quantity of the lubricating oil, namely the static oil level of the lubricating oil of the speed reducer is obtained by the formula:
2. the dynamic oil pressure characteristic quantity-based static oil level measuring method for mining speed reducer lubricating oil according to claim 1, characterized in that: the value of the interval time delta t in the step 1 is 30 seconds to 5 minutes according to the return speed of the lubricating oil after the actual speed reducer is shut down.
3. The dynamic oil pressure characteristic quantity-based static oil level measuring method for mining speed reducer lubricating oil according to claim 1, characterized in that: Δ p in step 2backflowSetting a basis to satisfy the minimum pressure change rate in the first half of the reflux process; Δ p in step 3stableThe setting is determined according to tests, and the value is larger than the maximum quantity of the pressure change of the lubricating oil in the stable section.
4. The dynamic oil pressure characteristic quantity-based static oil level measuring method for mining speed reducer lubricating oil according to claim 1, characterized in that: first time threshold T in step 2backflowThe setting basis is more than half of the time required by the first half of the speed reducer stopping lubricating oil backflow process; second time threshold T in step 3stableThe setting time is not less than 10 minutes.
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| CN102003248B (en) * | 2010-11-03 | 2012-10-17 | 江阴众和电力仪表有限公司 | Method for measuring lubricating oil level and sensor |
| CN102288409B (en) * | 2011-06-29 | 2013-05-15 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Method for testing static lubricating flow distribution of fixed-shaft gearbox shaft |
| CN106197530B (en) * | 2015-05-08 | 2021-06-08 | 丹佛斯（天津）有限公司 | Method for measuring dilution of lubricating oil, sensor and method for detecting oil level |
| US11512811B2 (en) * | 2016-07-12 | 2022-11-29 | Sikorsky Aircraft Corporation | System and method for detecting a lubricant-out condition in an aircraft gearbox |
| CN107701707B (en) * | 2017-09-14 | 2024-05-28 | 中国石油天然气股份有限公司 | Measuring and detecting system for reduction gearbox of pumping unit |
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