Gearbox oil and preparation method thereof

Abstract

The present invention relates to the technical field of lubricating oils, and in particular to a gearbox oil and a preparation method thereof, comprising: step S1, obtaining the density of each component of the gearbox oil; step S2, determining the combination mode and addition order of each component according to the density of each component; step S3, determining the stirring parameters or mixing methods of each combination in mixing based on the viscosity of each combination, the stirring parameters including stirring time, stirring speed, and stirring temperature; step S4, mixing each combination based on the addition order, the stirring parameters, and the mixing method, and determining the adjustment value of the stirring parameters according to the degree of mixing uniformity. The present invention optimizes the gearbox oil preparation process based on the density and viscosity of each component of the gearbox oil, and improves the stirring rate by reasonably determining the number of base oil additions, additive combinations, addition order, stirring parameters, and mixing methods, reducing the unevenness and stratification phenomenon in the mixing process, and improving the performance and stability of the gearbox oil.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating oil, and in particular to a gearbox oil and a preparation method thereof. Background Art

[0002] Transmission oil is an oil product that keeps the gear system clean. It can ensure the normal operation of the transmission and extend the life of the transmission. With the continuous advancement of automobile technology and the diversified development of transmission structure, higher requirements are put forward for the performance and compatibility of transmission oil, requiring oil products to have good performance to meet the needs of different models and transmissions.

[0003] In the prior art, the following phenomenon may occur during the preparation of transmission oil: due to insufficient performance of the mixing equipment or improper control parameters during the mixing process, such as mixing time, temperature, speed, etc. not reaching the optimal state, the base oil and additives cannot be fully mixed during the mixing process, resulting in uneven distribution of additives in the transmission oil, which may affect the overall performance of the transmission oil, such as lubricity, cleanliness and stability.

[0004] In order to effectively avoid the problems of insufficient mixing of the prepared transmission oil, uneven distribution of additives and low performance due to insufficient performance of the mixing equipment or improper control parameters during the mixing process, such as mixing time, temperature, speed, etc. not reaching the optimal state, it is necessary to develop a new technical solution to improve the mixing uniformity and performance stability of the transmission oil. Summary of the invention

[0005] To this end, the present invention provides a transmission oil and a preparation method thereof, so as to overcome the problems of uneven mixing and unstable performance of the transmission oil in the prior art.

[0006] To achieve the above object, on the one hand, the present invention provides a method for preparing a transmission oil, comprising:

[0007] Step S1, obtaining the density of each component of the transmission oil;

[0008] Step S2, determining the combination mode and addition order of the components according to the density of the components;

[0009] Step S3, determining stirring parameters or mixing methods of each combination during mixing based on the viscosity of each combination after combination, wherein the stirring parameters include stirring time, stirring speed and stirring temperature;

[0010] Step S4, mixing the combinations based on the adding order, the stirring parameters and the mixing method, and determining an adjustment value of the stirring parameter according to a mixing uniformity in a single mixing;

[0011] Wherein, the transmission oil is composed of base oil and several additives.

[0012] Furthermore, in step S2, it includes:

[0013] Step S21, determining the number of times the base oil is added according to the density of the base oil and the calculated density values ​​of each additive;

[0014] Step S22, determining the combination of the additives according to the density of the additives, wherein:

[0015] If the density difference between the maximum density and the minimum density of the densities of the additives is less than or equal to the preset first density difference, the additives are an integral combination;

[0016] If the density difference between the maximum density and the minimum density among the densities of the additives is greater than a preset first density difference, the additives are divided into a plurality of combinations based on the density difference.

[0017] Step S23, determining the order of adding the base oil and the additive combinations according to the number of additions and the density of the additive combinations;

[0018] The calculated density value is the combined density of all additives.

[0019] Further, in the step S21, the determination of the number of additions includes:

[0020] If the difference between the density of the base oil and the calculated density value is greater than a preset second density difference, the base oil is added multiple times according to a preset number of additions;

[0021] If the difference between the density of the base oil and the calculated density value is less than or equal to a preset second density difference, the base oil is added at one time.

[0022] Further, in step S23, the determination of the adding order includes:

[0023] If the number of additions of the base oil is equal to 1, then the combinations of additives are added to the base oil in the order of their combined density from large to small;

[0024] If the base oil is added more than 1 times and less than the number of combinations, the base oil is premixed with the combination with the largest combination density first, and then mixed in descending order of the density of the combination after premixing;

[0025] If the base oil is added more than or equal to the number of combinations, the base oil of a single addition is premixed with a single combination respectively, and then the premixed combination is added to the remaining base oils in descending order of density of the premixed combination.

[0026] Furthermore, in step S3, it also includes determining the mixing method of adding the single combination according to the maximum difference between the density of the base oil and each additive in the single combination, wherein:

[0027] If the maximum difference is greater than the preset third density difference, it is determined that the mixing method of the single combined addition is spray mixing;

[0028] If the maximum difference is less than or equal to the preset third density difference, the mixing method of the single combination addition is determined to be stirring mixing, and the corresponding stirring parameters are determined according to the comparison result of the calculated viscosity of each combination and the viscosity of the base oil.

[0029] Furthermore, in step S4, it includes:

[0030] Step S41, during each single mixing process, monitoring the mixing uniformity of the mixture in the single mixing;

[0031] Step S42, adjusting the stirring parameters or mixing method according to the mixing uniformity;

[0032] Step S43, mixing the remaining combinations based on the adjusted stirring parameters or the adjusted mixing method.

[0033] Furthermore, in the step S41, real-time monitoring of the uniformity of the mixture includes:

[0034] Measuring the viscosity values ​​of the components of the mixture at several positions by a viscometer, including the highest position of the liquid surface, the lowest position of the liquid surface, the middle position of the liquid surface, and at least two height positions of the inner wall of the stirring container;

[0035] Judging the mixing uniformity of the mixture according to the viscosity value includes:

[0036] If at least one of the viscosity values ​​exceeds the preset viscosity range, it is determined that the mixture is not mixed uniformly.

[0037] Furthermore, in the step S42, adjusting the stirring parameters or the mixing method according to the mixing uniformity includes:

[0038] When it is determined that the mixture is not mixed uniformly, the stirring parameter or the mixing method is adjusted according to the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity, wherein:

[0039] If the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is greater than the preset viscosity difference, it is determined that the mixing mode of the next mixing is adjusted to spray mixing;

[0040] If the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is less than or equal to the preset viscosity difference, it is determined to adjust the stirring parameters for the next mixing.

[0041] Furthermore, adjusting the preset number of additions includes:

[0042] Obtain the result of the uniformity of the current mixing process;

[0043] The adjustment method of the preset number of additions is determined according to the result of the mixing uniformity judgment, wherein:

[0044] If at least one of the viscosity values ​​exceeds the preset viscosity range, it is determined to increase the preset number of additions.

[0045] Furthermore, a transmission oil is prepared by the preparation method of the transmission oil of the present invention, and includes the following components, calculated by mass percentage: 2.5% to 5% viscosity index improver, 0.03% to 0.05% antifoaming agent, 2.87% to 3.35% detergent dispersant, 0.55% to 0.6% antioxidant, 0.25% to 0.4% antiwear agent, 0.3% to 0.35% friction modifier, 0.15% to 0.25% metal deactivator, 0.1% to 0.25% rust inhibitor and the remainder base oil.

[0046] Compared with the prior art, the beneficial effect of the present invention is that the present invention determines the combination mode and addition order of each component according to the density of each component of the gearbox oil, and after determining the combination mode, sets the stirring parameters or mixing mode according to the viscosity of each combination, including stirring time, stirring speed and stirring temperature, and mixes each component based on the addition order, the stirring parameters and the mixing mode. The present invention optimizes the gearbox oil preparation process based on the density and viscosity of each component of the gearbox oil, and increases the stirring rate by reasonably determining the number of base oil additions, additive combination, addition order, stirring parameters and mixing mode, reduces the unevenness and stratification phenomenon in the mixing process of each component, and improves the performance and stability of the gearbox oil.

[0047] Furthermore, the present invention determines the reasonable number of times of adding the base oil based on the density of the base oil and the calculated density of each additive, effectively avoiding the uneven distribution problem caused by density differences, so that each additive can fully play its role. Secondly, the combination of each additive is optimized, and grouping is performed according to the density of each additive, which is conducive to improving the compatibility of the additives and reducing adverse reactions between additives. Finally, the order of adding the base oil and each combination is determined, thereby effectively ensuring the uniform dispersion of each combination in the base oil, further increasing the stirring rate, and improving the stability and performance of the gearbox oil.

[0048] Furthermore, the present invention achieves precise control of base oil addition by determining the number of additions of the base oil. When the difference is greater than the preset second density difference, multiple additions are adopted to effectively avoid the problem of uneven mixing caused by one-time addition; when the difference is less than the preset second density difference, a one-time addition is adopted to reduce the number of operations and intermediate links, ensure that the mixture can reach the expected goal, further increase the stirring rate, and improve the stability and performance of the gearbox oil.

[0049] Furthermore, the present invention determines the order of adding the combinations and the base oil based on the number of times the base oil is added, and adopts a pre-mixing method to fully ensure the interaction between the combinations and the base oil, maximize the mixing effect, effectively control the distribution of the combinations in the base oil, ensure that the base oil and the combination reach an ideal mixing state, further increase the stirring rate, and improve the stability and performance of the gearbox oil.

[0050] Furthermore, the present invention achieves a fast and uniform mixing effect through spray mixing, and at the same time distinguishes the relationship between the viscosity of each combination and the viscosity of the base oil, adopts different stirring speeds, stirring times and stirring temperatures, and effectively improves the stirring efficiency and mixing quality. When the viscosity of each combination is less than the viscosity of the base oil, a faster stirring speed, a shorter stirring time, and a higher stirring temperature can be used to quickly achieve uniform mixing, avoiding the problem of uneven mixing caused by viscosity differences. Secondly, when the viscosity of each combination is greater than the viscosity of the base oil, a lower stirring speed, a longer stirring time, and a higher stirring temperature are used, which can ensure that a good mixing effect can be achieved even when the viscosity is high, further increasing the stirring rate and improving the stability and performance of the transmission oil.

[0051] Furthermore, during the mixing process, the present invention monitors the mixing uniformity of the mixture in real time, adjusts the stirring parameters or mixing method in time according to the mixing uniformity, and mixes the remaining combination based on the adjusted stirring parameters or the adjusted mixing method, thereby optimizing the stirring process, further increasing the stirring rate, and improving the stability and performance of the transmission oil.

[0052] Furthermore, the present invention measures the viscosity values ​​of the components at several positions of the mixture by a viscometer, and compares the preset viscosity range to accurately determine whether the mixture has reached a uniform state. By comparing the preset viscosity range, the present invention promptly discovers and eliminates the defect of uneven mixing, ensures the mixing uniformity during the preparation of the transmission oil, further improves the stirring rate, and improves the stability and performance of the transmission oil.

[0053] Furthermore, the present invention dynamically adjusts the stirring parameters or the mixing method according to the mixing uniformity of the mixture during the mixing process. By changing the mixing method to spray mixing or optimizing the stirring parameters, the mixing uniformity of the mixture is significantly improved, ensuring that the components of the mixture can achieve an ideal state distribution, further increasing the stirring rate, and improving the stability and performance of the transmission oil.

[0054] Furthermore, the present invention adjusts the preset number of base oil additions during the preparation process of the transmission oil. When at least one viscosity value in the mixture exceeds the preset viscosity range, the preset number of additions is increased, thereby effectively overcoming the degradation of transmission performance caused by improper oil viscosity, ensuring that the transmission oil is always in an appropriate viscosity range, so that the transmission can maintain good working performance under various working conditions, further improving the stirring rate, and improving the stability and performance of the transmission oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a flow chart of a method for preparing a transmission oil of the present invention;

[0056] Figure 2 The present invention is a flow chart for determining the combination mode and addition order of each component according to the density of each component;

[0057] Figure 3 A flowchart of adding a sequence to the combination of the present invention;

[0058] Figure 4 The present invention is a flow chart for determining stirring parameters or mixing methods of each combination during mixing based on the viscosity of each combination. DETAILED DESCRIPTION

[0059] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0060] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0061] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0062] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] See also Figure 1 FIG. 1 is a flow chart of a method for preparing a transmission oil according to the present invention, comprising:

[0064] Step S1, obtaining the density of each component of the transmission oil;

[0065] Step S2, determining the combination mode and addition order of the components according to the density of the components;

[0066] Step S3, determining stirring parameters or mixing methods of each combination during mixing based on the viscosity of each combination after combination, wherein the stirring parameters include stirring time, stirring speed and stirring temperature;

[0067] Step S4, mixing the combinations based on the adding order, the stirring parameters and the mixing method, and determining an adjustment value of the stirring parameter according to a mixing uniformity in a single mixing;

[0068] Wherein, the transmission oil is composed of base oil and several additives.

[0069] The present invention determines the combination mode and addition order of each component according to the density of each component of the gearbox oil. After the combination mode is determined, the stirring parameters or mixing methods are set according to the viscosity of each combination, including stirring time, stirring speed and stirring temperature, and the components are mixed based on the addition order, the stirring parameters and the mixing method. The present invention optimizes the gearbox oil preparation process based on the density and viscosity of each component of the gearbox oil, and increases the stirring rate by reasonably determining the number of base oil additions, additive combination, addition order, stirring parameters and mixing method, reducing the unevenness and stratification phenomenon in the mixing process of each component, and improving the performance and stability of the gearbox oil.

[0070] See also Figure 2 As shown, it is a flow chart of determining the combination mode and addition order of each component according to the density of each component in the present invention, in step S2, including:

[0071] Step S21, determining the number of times the base oil is added according to the density of the base oil and the calculated density values ​​of each additive;

[0072] Step S22, determining the combination of the additives according to the density of the additives, wherein:

[0073] If the density difference between the maximum density and the minimum density of the densities of the additives is less than or equal to the preset first density difference, the additives are an integral combination;

[0074] If the density difference between the maximum density and the minimum density among the densities of the additives is greater than a preset first density difference, the additives are divided into a plurality of combinations based on the density difference.

[0075] Step S23, determining the order of adding the base oil and the additive combinations according to the number of additions and the density of the additive combinations;

[0076] The calculated density value is the combined density of all additives.

[0077] It is understood that when the additives are combined, the additives are easy to mix evenly when the density difference is less than or equal to the preset first density difference, so the additives can be grouped together. When the density difference is greater than the preset first density difference, the additives are divided into several combinations based on the density difference. Generally speaking, additives with larger density can be combined, and then additives with smaller density can be combined, so as to ensure uniformity and stability of mixing.

[0078] In implementation, the density calculation value ρ′ is calculated using the following formula:

[0079]

[0080] in, is the sum of the masses of all additives, m i For the mass of each additive, is the sum of the volumes of the additives, v i is the volume of each additive, and n is the number of additives.

[0081] Sort the densities of the additives, and the largest density is ρ max , the minimum density is ρ min , the density difference is ρ max -ρ min , if max -ρ min If the density difference is greater than a preset first density difference, the additives are divided into several combinations based on the density difference. Preferably, the value interval of the preset first density difference is 0.05 g / cm 3 ~0.15g / cm 3 Preferably, the first density difference is preset to be 0.1 g / cm 3The specific value of the preset first density difference can be adjusted according to actual conditions, and will not be described in detail here.

[0082] The present invention determines the reasonable number of times of adding the base oil based on the density of the base oil and the calculated density of each additive, effectively avoiding the problem of uneven distribution caused by density difference, so that each additive can fully play its role. Secondly, the combination of each additive is optimized, and grouping is performed according to the density of each additive, which is conducive to improving the compatibility of the additives and reducing adverse reactions between the additives. Finally, the addition order of the base oil and each combination is determined, so as to effectively ensure the uniform dispersion of each combination in the base oil, further improve the stirring rate, and improve the stability and performance of the gearbox oil.

[0083] Specifically, in step S21, the determination of the number of additions includes:

[0084] If the difference between the density of the base oil and the calculated density value is greater than a preset second density difference, the base oil is added multiple times according to a preset number of additions;

[0085] If the difference between the density of the base oil and the calculated density value is less than or equal to a preset second density difference, the base oil is added at one time.

[0086] It can be understood that the second density difference is the density difference between the density of the base oil and the combined density of the additives. The difference between the density of the base oil and the combined density of the additives can be determined by the second density difference. If the difference is greater than the preset second density difference, it means that the base oil should be divided according to the preset number of additions and then stirred and mixed with the combinations for uniform mixing.

[0087] In implementation, the base oil density is ρ0, and the difference between the base oil density and the calculated density value is |ρ0-ρ'|. Generally speaking, the range of the preset second density difference is set to 0.02 g / cm 3 ~0.2g / cm 3 Preferably, the second density difference is preset to be 0.05 g / cm 3 The preset number of additions is 3 to 5, and preferably, the preset number of additions is 4.

[0088] The present invention realizes precise control of base oil addition by determining the number of times the base oil is added. When the difference is greater than the preset second density difference, multiple additions are adopted to effectively avoid the problem of uneven mixing caused by one-time addition; when the difference is less than the preset second density difference, a one-time addition is adopted to reduce the number of operations and intermediate links, ensure that the mixture can reach the expected goal, further increase the stirring rate, and improve the stability and performance of the gearbox oil.

[0089] See also Figure 3 As shown, it is a flowchart of the combination adding order of the present invention. In the step S23, the determination of the adding order includes:

[0090] Step S231, if the number of times the base oil is added is equal to 1, then adding each combination of additives to the base oil in the order of their combined density from large to small;

[0091] Step S232, if the number of times the base oil is added is greater than 1 and less than the number of combinations, the base oil is premixed with the combination with the largest combination density first, and then mixed in descending order of the density of the premixed combination;

[0092] Step S233, if the number of times the base oil is added is greater than or equal to the number of combinations, premix the single base oil with the single combination respectively, and then add the premixed combination to the remaining base oil in descending order of density of the premixed combination.

[0093] It is understood that, in a specific embodiment, if the base oil is not added in batches, the combinations are added to the base oil one by one in the order of the combination density of the combinations from large to small;

[0094] In a specific embodiment, if the number of times the base oil is added is greater than 1 and less than the number of combinations, the base oil is first premixed with the combination with a larger combination density, and then the combination densities of the premixed combinations are sorted, and the premixed combinations with smaller combination densities and the remaining combinations that have not been premixed are added to the premixed combinations with larger density in descending order of density;

[0095] In a specific embodiment, if the number of base oil additions is greater than or equal to the number of combinations, the base oil is premixed with each combination separately, and then the premixed combinations are added to the remaining base oils in order of the combination density of the premixed combinations from large to small.

[0096] The present invention determines the order of adding the various combinations and the base oil based on the number of times the base oil is added, adopts a pre-mixing method, fully ensures the interaction between the various combinations and the base oil, maximizes the mixing effect, effectively controls the distribution of the various combinations in the base oil, ensures that the base oil and the composition reach an ideal mixing state, further improves the stirring rate, and improves the stability and performance of the gearbox oil.

[0097] See also Figure 4As shown, it is a flow chart of the present invention for determining the stirring parameters or mixing methods of each combination in the mixing process based on the viscosity of each combination. In step S3, it also includes determining the mixing method of adding a single combination according to the maximum difference between the density of the base oil and each additive in the single combination, wherein:

[0098] Step S31, if the maximum difference is greater than the preset third density difference, it is determined that the mixing method of the single combined addition is spray mixing;

[0099] Step S32: if the maximum difference is less than or equal to the preset third density difference, it is determined that the mixing method of the single combination addition is stirring mixing, and the corresponding stirring parameters are determined according to the comparison result of the calculated viscosity of each combination and the viscosity of the base oil.

[0100] In practice, the base oil density is ρ0, and the maximum density of the additives in a single combination is ρ i , the maximum difference is |ρ0-ρ i |, if the maximum difference |ρ0-ρ i | If the value of the preset third density difference is greater than 0.1 g / cm, the mixing method of the single combined addition is determined to be spray mixing. During the spraying process, the additive is ejected through the nozzle and mixed with the mixture to achieve a fast and uniform mixing effect. Generally speaking, the value range of the preset third density difference is 0.1 g / cm 3 ~0.25g / cm 3 Preferably, the third density difference is preset to be 0.15 g / cm 3 .

[0101] It is understandable that when mixing combinations with different viscosities with base oil, adjusting the stirring speed, stirring time and stirring temperature is a key step to ensure the uniformity and quality of the mixture. If the calculated viscosity of each combination is less than the viscosity of the base oil, the stirring speed is the preset first stirring speed, the stirring time is the preset first stirring time, and the stirring temperature is the preset first stirring temperature; if the viscosity of each combination is greater than the viscosity of the base oil, the stirring speed is the preset second stirring speed, the stirring time is the preset second stirring time, and the stirring temperature is the preset second stirring temperature; wherein the preset first stirring speed is greater than the preset second stirring speed, the preset first stirring time is less than the preset second stirring time, and the preset first stirring temperature is less than the preset second stirring temperature. When the viscosity of each combination is less than the viscosity of the base oil, high-speed stirring can increase the shear force and promote mixing at the same time, short-time stirring can avoid heat accumulation or mixture decomposition caused by excessive stirring, and low-temperature stirring can reduce the heat generated by the mixture due to stirring. When the viscosity of each combination is greater than the viscosity of the base oil, low-speed stirring can avoid the destruction of the mixture caused by excessive bubbles and shear force, long-time stirring can ensure that the mixture is fully mixed, and high-temperature stirring helps to reduce the viscosity of the mixture and promote mixing.

[0102] In implementation, the viscosity μ_mix of each combination is calculated as follows:

[0103]

[0104] Among them, μ_mix is ​​the viscosity of each combination, is the volume fraction of the jth additive in each combination, and μ j is the viscosity of the jth additive in each combination, and M is the number of corresponding additives in each combination.

[0105] In implementation, the usual stirring speed is 200r / min to 500r / min, preferably, the preset first stirring speed is 450r / min, and the preset second stirring speed is 300r / min; the stirring time is 10min to 20min, preferably, the preset first stirring time is 10min, and the preset second stirring time is 15min; the stirring temperature is 50℃-75℃, preferably, the preset first stirring temperature is 55℃, and the preset second stirring temperature is 70℃. The stirring temperature, the stirring time, the stirring speed, the preset first stirring temperature, the second stirring temperature, the preset first stirring time, the second stirring time, the preset first stirring speed, and the second stirring speed can be adjusted according to actual conditions, and will not be repeated here.

[0106] The present invention achieves a rapid and uniform mixing effect through spray mixing, and at the same time distinguishes the relationship between the viscosity of each combination and the viscosity of the base oil, adopts different stirring speeds, stirring times and stirring temperatures, and effectively improves the stirring efficiency and mixing quality. When the viscosity of each combination is less than the viscosity of the base oil, a faster stirring speed, a shorter stirring time, and a higher stirring temperature are adopted to quickly achieve uniform mixing, thereby avoiding the problem of uneven mixing caused by viscosity differences. Secondly, when the viscosity of each combination is greater than the viscosity of the base oil, a lower stirring speed, a longer stirring time, and a higher stirring temperature are adopted, which can ensure that a good mixing effect can be achieved even when the viscosity is high, further improve the stirring rate, and improve the stability and performance of the transmission oil.

[0107] Specifically, in step S4, it includes:

[0108] Step S41, during each single mixing process, monitoring the mixing uniformity of the mixture in the single mixing;

[0109] Step S42, adjusting the stirring parameters or mixing method according to the mixing uniformity;

[0110] Step S43, mixing the remaining combinations based on the adjusted stirring parameters or the adjusted mixing method.

[0111] During the mixing process, the present invention monitors the mixing uniformity of the mixture in real time, adjusts the stirring parameters or the mixing method in time according to the mixing uniformity, and mixes the remaining combination based on the adjusted stirring parameters or the adjusted mixing method, thereby optimizing the stirring process, further increasing the stirring rate, and improving the stability and performance of the transmission oil.

[0112] Specifically, in step S41, real-time monitoring of the uniformity of the mixture includes:

[0113] Step S411, measuring the viscosity values ​​of the components of the mixture at several positions by a viscometer, including the highest position of the liquid surface, the lowest position of the liquid surface, the middle position of the liquid surface, and at least two height positions of the inner wall of the stirring container;

[0114] Step S412, judging the mixing uniformity of the mixture according to the viscosity value, comprises:

[0115] If at least one of the viscosity values ​​exceeds the preset viscosity range, it is determined that the mixture is not mixed uniformly.

[0116] It is understandable that, in order to monitor the mixing uniformity of the mixture, the viscosity value of several positions of the mixture can be measured by a viscometer, and the viscosity value is the kinematic viscosity. In implementation, several representative positions are selected according to the size and shape of the stirred container for viscosity measurement. For example, the viscosity value of the mixture is measured at at least two height positions of the highest position of the liquid level of the stirred container, the lowest position of the liquid level, the middle position of the liquid level, and the inner wall of the stirred container, while maintaining the consistency of the measurement conditions (such as temperature, pressure, etc.) during the measurement process. By comparing the viscosity values ​​at different positions, the mixing uniformity of the mixture is evaluated. If there is at least one viscosity value beyond the preset viscosity range, it is determined that the mixture is not mixed uniformly, and the mixing process needs to be further adjusted.

[0117] In practice, the preset viscosity range is the kinematic viscosity range. Based on the formula of this embodiment, the preset viscosity range is 6.5 mm 2 / s~8.5mm 2 / s, the preset viscosity range can be adjusted according to actual conditions, which will not be described in detail here. There is no unique method for determining whether the mixture is mixed uniformly, and statistical methods (such as standard deviation, coefficient of variation, etc.) can also be considered to quantify the mixing uniformity of the mixture or other methods for determination, which will not be described in detail here.

[0118] The present invention measures the viscosity values ​​of the components at several positions of the mixture by a viscometer, and compares the preset viscosity range to accurately determine whether the mixture has reached a uniform state. By comparing the preset viscosity range, the present invention timely discovers and eliminates the defect of uneven mixing, ensures the mixing uniformity during the preparation of the transmission oil, further improves the stirring rate, and improves the stability and performance of the transmission oil.

[0119] Specifically, in the step S42, adjusting the stirring parameters or the mixing method according to the mixing uniformity includes:

[0120] When it is determined that the mixture is not mixed uniformly, the stirring parameter or the mixing method is adjusted according to the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity, wherein:

[0121] In case 1, if the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is greater than the preset viscosity difference, it is determined that the mixing method for the next mixing is adjusted to spray mixing;

[0122] Case 2: If the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is less than or equal to the preset viscosity difference, it is determined to adjust the stirring parameters for the next mixing.

[0123] It is understandable that in the process of preparing the transmission oil, it is very important to ensure that the mixture is mixed evenly. The stirring parameters and mixing method have a direct impact on the mixing effect. When the mixture is mixed evenly, the stirring parameters are the optimal stirring parameters; when the mixture is not mixed evenly, if the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is greater than the preset viscosity difference, the mixing method is adjusted to spray mixing to achieve rapid mixing; if the difference is less than or equal to the preset viscosity difference, adjust the stirring parameters for the next mixing. The stirring parameters can be quickly adjusted by extending the stirring time, increasing the stirring speed or increasing the stirring temperature to improve the mixing condition.

[0124] In practice, the preset viscosity is 8.5 mm 2 / s, the preset viscosity difference is ±0.1mm 2 / s. The preset viscosity and the preset viscosity difference can be adjusted according to actual conditions, which will not be described in detail here. In the spray mixing, the nozzle is tilted downward, and the nozzle aperture ranges from 1 to 3 mm. Preferably, the nozzle aperture is set to 2 mm; the spray pressure ranges from 0.5 to 2 MPa. Preferably, the spray pressure is 1 MPa; the spray flow rate is determined according to the nozzle aperture size and the spray pressure. The spray angle (the angle between the nozzle and the inner wall of the stirring container) is 30°, 45°, and 60°. Preferably, the spray angle is 30°; the spray time ranges from 5 min to 10 min. Preferably, the spray time is 5 min; the above spray parameters can be adjusted according to actual conditions, which will not be described in detail here.

[0125] The present invention dynamically adjusts the stirring parameters or the mixing method according to the mixing uniformity of the mixture during the mixing process. By changing the mixing method to spray mixing or optimizing the stirring parameters, the mixing uniformity of the mixture is significantly improved, ensuring that the components of the mixture can achieve an ideal state distribution, further increasing the stirring rate, and improving the stability and performance of the transmission oil.

[0126] Specifically, adjusting the preset number of additions includes:

[0127] Obtain the result of the uniformity of the current mixing process;

[0128] The adjustment method of the preset number of additions is determined according to the result of the mixing uniformity judgment, wherein:

[0129] If at least one of the viscosity values ​​exceeds the preset viscosity range, it is determined to increase the preset number of additions.

[0130] It is understandable that by adjusting the preset number of base oil additions during the gearbox oil preparation process, the viscosity of the mixture can be ensured to be consistent. When at least one of the viscosity values ​​in the current combination exceeds the preset viscosity range, the number of base oil additions is increased, and the amount of base oil added each time is reduced, thereby reducing the viscosity of the mixture. Generally, the increase in the preset number of additions is 1 time each time, and the amount of base oil added to each combination after the increase is evenly distributed.

[0131] The present invention adjusts the preset number of base oil additions during the gearbox oil preparation process. When at least one viscosity value in the mixture exceeds the preset viscosity range, the preset number of additions is increased, thereby effectively overcoming the gearbox performance degradation caused by improper oil viscosity, ensuring that the gearbox oil is always in a suitable viscosity range, so that the gearbox can maintain good working performance under various working conditions, further increasing the stirring rate, and improving the stability and performance of the gearbox oil.

[0132] Specifically, the gearbox oil preparation method of the present invention is used to prepare the gearbox oil, and the gearbox oil includes the following components in percentage by mass: 2.5% to 5% viscosity index improver, 0.03% to 0.05% antifoaming agent, 2.87% to 3.35% detergent dispersant, 0.55% to 0.6% antioxidant, 0.25% to 0.4% antiwear agent, 0.3% to 0.35% friction modifier, 0.15% to 0.25% metal deactivator, 0.1% to 0.25% rust inhibitor and the remainder base oil.

[0133] In order to further illustrate the present invention, the transmission oil and the preparation method thereof provided by the present invention are described in detail below, but they should not be understood as limiting the protection scope of the present invention.

[0134] In practice, the specific amounts of viscosity index improver, antifoaming agent, detergent dispersant, antioxidant, antiwear agent, friction modifier, metal deactivator, rust inhibitor and base oil are shown in Table 1.

[0135] Table 1 Specific amount of gearbox oil used in Examples 1 to 3

[0136]

[0137]

[0138] Example 1

[0139] In this embodiment, the viscosity index improver is polymethacrylate with a density of 1.02 g / cm 3 The antifoaming agent is dimethyl silicone oil with a density of 0.89 g / cm 3 The detergent dispersant is boronated polyisobutylene succinimide with a density of 0.88 g / cm 3 The antioxidant is 4,4'-dioctyldiphenylamine, with a density of 1.05g / cm 3 The anti-wear agent is triphenyl thiophosphate, with a density of 1.1 g / cm 3 The friction modifier is n-hexadecylamine, with a density of 0.80 g / cm 3 The metal deactivator is a thiadiazole derivative with a density of 1.2 g / cm 3 The rust inhibitor is a metal sulfonate with a density of 1.4 g / cm 3 The base oil is a mixture of neopentyl glycol dioleate, di(2-ethylhexyl) azelaic acid ester, pentaerythritol oleate, and poly-alpha-olefin base oil.

[0140] The gearbox oil preparation process is as follows:

[0141] Neopentyl glycol dioleate, di(2-ethylhexyl) azelaic acid ester, pentaerythritol oleate, and polyalphaolefin base oil were stirred and mixed at a stirring speed of 400 r / min to obtain a base oil. The base oil had a density of 0.89 g / cm 3 ;

[0142] Determine the number of times the base oil is added: The calculated density value is 0.955 g / cm 3 The difference between the density of the base oil and the calculated density value is 0.065, which is greater than the preset second density difference of 0.05 g / cm 3 , the number of base oil additions is 4.

[0143] Determine the combination method: ρ max 1.4g / cm 3 , ρ min 0.80g / cm 3 , the density difference is greater than the preset first density difference of 0.1g / cm 3 , the additives were grouped according to a tolerance of 0.2, and combination A was obtained: dimethyl silicone oil, boronated polyisobutylene succinimide, and n-hexadecylamine; combination B: polymethacrylate, 4,4'-dioctyldiphenylamine, and triphenylthiophosphate; combination C: thiadiazole derivatives; and combination D: metal sulfonates.

[0144] Determine the mixing method: the base oil density is 0.89g / cm 3 The maximum difference between the density of the base oil and the additives in combination A and combination B is less than the preset third density difference of 0.15 g / cm 3 The mixing method of combination A and combination B is stirring; the maximum difference in density between the base oil and the additives in combination C and combination D is greater than the preset third density difference of 0.15g / cm 3 Therefore, the mixing method of combination C and combination D is spray mixing + stirring mixing.

[0145] During spray mixing, three larger nozzles are set at equal intervals on the inner wall of the stirring container. The nozzles are tilted downward at 30°, the nozzle aperture is set to 2mm, the spray pressure is 1Mpa, the spray oil mist particle size is 0.3μm, and the spray time is 5min. One of the nozzles sprays each combined additive, one sprays the base oil, and one sprays the mixture. Two of the nozzles spray the additives and base oil at the same time at a higher spray speed. The higher spray speed can produce smaller droplets, which is beneficial to increase the contact area between the additives and the base oil. The other nozzle sprays the mixture at a higher spray speed in a cycle, and the cycle spraying is continued until the base oil is added, thereby improving the mixing efficiency.

[0146] Determine the stirring parameters and mixing method: the number of base oil additions and the number of additive combinations are both 4. The base oil and each combination are pre-mixed respectively. According to the viscosity of each combination, the stirring parameters of each combination and the base oil can be known: Combination A: stirring time 10 min, stirring temperature 55°C, stirring speed 450 r / min; Combination B: stirring time 15 min, stirring temperature 70°C, stirring speed 300 r / min; Combination C and combination D have a spraying time of 5 min, a stirring time of 5 min, a stirring temperature of 55°C, and a stirring speed of 450 r / min.

[0147] Adjust stirring parameters and mixing methods: During the mixing process, monitor the mixing uniformity of the mixture in real time. After the combination A is stirred, the viscosity value at a certain height in the stirring container is 8.7mm 2 / s, exceeding the preset viscosity range, combination A is not mixed evenly, and the difference between this viscosity value and the preset viscosity is 1.7mm 2 / s, greater than the preset viscosity difference, the base oil addition times are increased by 1, and the mixing mode of combination B is adjusted to spray mixing, the spraying time is 5 minutes, and the stirring time is 5 minutes; after the combination B is sprayed and stirred, the viscosity value is within the preset viscosity range; after the combination C is sprayed and stirred, the viscosity value at the highest position of the liquid surface is 8.6mm 2 / s is not within the preset viscosity range, and the difference between the viscosity value and the preset viscosity is equal to the preset viscosity difference, the stirring parameters of combination D are adjusted. After adjustment, the stirring time is 10 minutes, and the number of base oil additions is increased by 1.

[0148] After mixing, the viscosity value at the highest position of the liquid surface in the stirring container is 8.25mm 2 / s, the viscosity value at the lowest position of the liquid surface is 6.56mm 2 / s, the viscosity value at the middle position of the liquid surface is 7.89mm 2 / s and the viscosity values ​​at at least two height positions of the inner wall of the stirring container are 7.53mm 2 / s、6.77mm 2 / s, and the viscosity values ​​are all within the preset viscosity range.

[0149] In this embodiment 1, the final base oil addition times are 6, and the total duration of the stirring time and the spraying time is 45 minutes. The mixing effect is good, the mixing rate is high, and the gearbox oil preparation time is saved.

[0150] Example 2

[0151] In this embodiment, the friction modifier is ethylene glycol oleate, with a density of 0.85 g / cm 3 The rust inhibitor is dodecenylsuccinic acid, with a density of 1.04 g / cm 3The base oil is III+ base oil with a density of 0.82 g / cm 3 , the remaining ingredients are all the same as in Example 1.

[0152] The gearbox oil preparation process is as follows:

[0153] Determine the number of times the base oil is added: The calculated density value is 0.968 g / cm 3 The difference between the density of the base oil and the calculated density value is 0.148, which is greater than the preset second density difference of 0.05 g / cm 3 , the number of base oil additions is 4.

[0154] Determine the combination method: ρ max 1.2g / cm 3 , ρ min 0.85g / cm 3 , the density difference is greater than the preset first density difference of 0.1g / cm 3 , the additives were grouped according to a tolerance of 0.2, and combination A was obtained: polymethacrylate, dimethyl silicone oil, boronated polyisobutylene succinimide, 4,4'-dioctyldiphenylamine, triphenyl thiophosphate, dodecenylsuccinic acid; combination B: thiadiazole derivatives, ethylene glycol oleate.

[0155] Determine the mixing method: the base oil density is 0.89g / cm 3 The maximum difference between the density of the base oil and the additive in combination A is greater than the preset third density difference of 0.15 g / cm 3 The mixing method of combination A is spray mixing + stirring mixing; the maximum difference in density between the base oil and the additive in combination B is greater than the preset third density difference of 0.15g / cm 3 Therefore, the mixing method of combination B is spray mixing + stirring mixing.

[0156] Determine the stirring parameters and stirring method: the number of base oil additions is 4, the number of additive combinations is 2, and after the base oil and each combination are pre-mixed, the pre-mixed combination is added to the remaining base oil in the order of the density of the pre-mixed combination from large to small. According to the viscosity of each combination, the stirring parameters of each combination and the base oil are as follows: Combination A: spraying time 5min, stirring time 10min, stirring temperature 55℃, stirring speed 450r / min; Combination B: spraying time 5min, stirring time 10min, stirring temperature 55℃, stirring speed 450r / min.

[0157] Adjust stirring parameters and mixing methods: During the mixing process, monitor the mixing uniformity of the mixture in real time. After the combination A is stirred, the viscosity value at a certain height in the stirring container is 8.55mm 2 / s, exceeding the preset viscosity range, combination A is not mixed evenly, and the difference between this viscosity value and the preset viscosity is 0.05mm 2 / s, which is less than the preset viscosity difference, the number of base oil additions is still 4, the stirring parameters of combination B are adjusted to a stirring time of 15 minutes, and stirring is continued to obtain the gearbox oil.

[0158] After mixing, the viscosity value at the highest position of the liquid surface in the stirring container is 8.46mm 2 / s, the viscosity value at the lowest position of the liquid surface is 6.53mm 2 / s, the viscosity value at the middle position of the liquid surface is 7.05mm 2 / s and the viscosity values ​​at at least two height positions of the inner wall of the stirring container are 7.63mm 2 / s、8.02mm 2 / s, and the viscosity values ​​are all within the preset viscosity range.

[0159] In this embodiment 2, the final base oil addition times are 5, and the total duration of the stirring time and the spraying time is 35 minutes. The mixing effect is good, the mixing rate is high, and the gearbox oil preparation time is saved.

[0160] Example 3

[0161] In this embodiment, the additive components and proportions are all the same as those in Example 2, and the additive combination is changed to: combination A: polymethacrylate, dimethyl silicone oil, boronated polyisobutylene succinimide, 4,4'-dioctyl diphenylamine; combination B: thiadiazole derivatives, oleic acid ethylene glycol ester; combination C: triphenyl thiophosphate, dodecenyl succinic acid. The number of base oil additions is still 4, the number of additive combinations is 3, and the parameters of combination A, combination B, and combination C are: spray time 5min, stirring time 10min, stirring temperature 55°C, and stirring speed 450r / min.

[0162] During the mixing process, the mixing uniformity of the mixture was monitored in real time. After the mixing of combination A, combination B, and combination C was completed, the viscosity values ​​at several locations in the mixing container did not exceed the preset viscosity range. After the mixing was completed, the viscosity value at the highest position of the liquid surface in the mixing container was 8.23 ​​mm 2 / s, the viscosity value at the lowest position of the liquid surface is 6.89mm 2 / s, the viscosity value at the middle position of the liquid surface is 7.62mm 2 / s and the viscosity values ​​at at least two height positions of the inner wall of the stirring container were 8.34 mm 2 / s、7.39mm 2 / s, and the viscosity values ​​are all within the preset viscosity range.

[0163] In this embodiment 3, the final base oil addition times are 4, and the total duration of the stirring time and the spraying time is 45 minutes. The mixing effect is good, the mixing rate is high, and the gearbox oil preparation time is saved.

[0164] Comparative Example 1

[0165] The formula of the gearbox oil prepared in this comparative example is the same as that in Example 1, except that the mixing method of combination D in the preparation process is stirring mixing;

[0166] The stirring time of combination D is 18 min, the stirring temperature is 55°C, and the stirring speed is 450 r / min.

[0167] In this comparative example 1, the final base oil addition times were 6, the viscosity values ​​were all within the preset viscosity range, and the total mixing time was 58 minutes.

[0168] Comparative Example 2

[0169] The formula of the gearbox oil prepared in this comparative example is the same as that in Example 1, except that the number of additions in the preparation process does not increase and remains 4. The stirring parameters and mixing methods of the combination B and the combination D do not change.

[0170] The stirring time of the combination B is 15 minutes, the stirring temperature is 70°C, and the stirring speed is 300 r / min; the spraying time of the combination D is 5 minutes, the stirring time is 5 minutes, the stirring temperature is 55°C, and the stirring speed is 450 r / min.

[0171] In this comparative example 2, the final base oil addition times were 4, and the total mixing time was 45 minutes. However, after the mixing was completed, the viscosity value at the highest position of the liquid surface was 8.89 mm 2 / s, the viscosity values ​​at at least two height positions on the inner wall of the stirring container are 6.34mm 2 / s、8.56mm 2 / s, there are three positions where the viscosity values ​​are not within the preset viscosity range, and the stirring effect is poor.

[0172] Comparative Example 3

[0173] The formula of the gearbox oil prepared in this comparative example is the same as that in Example 2, except that: Combination A: no spraying, stirring time 15 min, stirring temperature 55°C, stirring speed 450 r / min; Combination B: no spraying, stirring time 20 min, stirring temperature 55°C, stirring speed 450 r / min.

[0174] After mixing, the total mixing time is 35 minutes. After mixing, the viscosity value at the highest position of the liquid surface is 5.89 mm. 2 / s, the lowest liquid level is 6.43mm 2 / s, the viscosity values ​​at at least two height positions on the inner wall of the stirring container were 8.67mm 2 / s, 6.43mm 2 / s, there are four positions where the viscosity values ​​are not within the preset viscosity range, and the stirring effect is poor.

[0175] Comparative Example 4

[0176] After all components are weighed by weight, synthetic base oil and deeply refined Class III base oil are added to a blending kettle, and heated to 50-55°C at a heating rate of 80-120°C / h; acrylamide-pentanediol diacrylate copolymer, tricresyl phosphate, didecylphenyl phosphite, high base synthetic calcium sulfonate T106, antioxidant, defoamer and rust inhibitor are added to the blending kettle, and the temperature is kept at 50-55°C for 25-35 minutes; a colorant is added to the blending kettle, and stirring is continued for 25-35 minutes to obtain a gearbox oil.

[0177] The above technical solution does not count the 30 minutes for preparing acrylamide-pentanediol diacrylate copolymer, but only counts the stirring time, which is 70 minutes at the longest and 50 minutes at the shortest.

[0178] Comparative Example 5

[0179] Stir neopentyl glycol ester, diester, pentaerythritol ester and polyalphaolefin base oil for 10-20 minutes to mix evenly, raise the temperature to 55-85°C, add viscosity index improver and detergent dispersant and stir for 10-20 minutes to mix evenly, maintain the temperature at 50-70°C, add graphene oxide, antioxidant, defoamer, rust inhibitor and anti-wear agent and stir for 30-50 minutes to obtain transmission oil.

[0180] When the above technical solution is used to prepare anti-wear automatic transmission oil, the longest stirring time is 90 minutes and the shortest is 50 minutes.

[0181] Comparative Example 6

[0182] The anti-foaming agent aviation kerosene is diluted in a mass ratio of 1:10 to obtain a diluted anti-foaming agent solution; the mixed base oil is heated to 55 to 65°C, and the viscosity index improver and the diluted anti-foaming agent solution are added in sequence, and stirred for 30 minutes to obtain a mixed solution; detergent, dispersant, antioxidant, extreme pressure agent, anti-wear agent, friction modifier, sealing expansion agent, and metal deactivator are added in sequence to the mixed solution, and stirred for 40 to 60 minutes to obtain a gearbox oil.

[0183] When the gearbox oil is prepared by the above technical solution, the longest stirring time is 90 minutes and the shortest is 70 minutes.

[0184] It can be seen from the results of the above-mentioned embodiments and comparative examples that the transmission oil prepared by the transmission oil preparation method of the present invention accelerates the stirring rate, shortens the stirring time, avoids unevenness and stratification, the base oil and the additive are evenly mixed, and the transmission oil has stable performance.

[0185] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for preparing a transmission oil, characterized in that: include: Step S1, obtaining the density of each component of the transmission oil; Step S2, determining the combination mode and addition order of the components according to the density of the components; Step S3, determining stirring parameters or mixing methods of each combination during mixing based on the viscosity of each combination after combination, wherein the stirring parameters include stirring time, stirring speed and stirring temperature; Step S4, mixing the combinations based on the adding order, the stirring parameters and the mixing method, and determining an adjustment value of the stirring parameter according to a mixing uniformity in a single mixing; Wherein, the gearbox oil is composed of base oil and several additives; In step S2, it includes: Step S21, determining the number of times the base oil is added according to the density of the base oil and the calculated density values ​​of the additives, wherein the calculated density value is the combined density of all additives, wherein the determination of the number of times the base oil is added includes: If the difference between the density of the base oil and the calculated density value is greater than a preset second density difference, the base oil is added multiple times according to a preset number of additions; If the difference between the density of the base oil and the calculated density value is less than or equal to a preset second density difference, the base oil is added at one time; Step S22, determining the combination of the additives according to the density of the additives, wherein: If the density difference between the maximum density and the minimum density of the densities of the additives is less than or equal to the preset first density difference, the additives are an integral combination; If the density difference between the maximum density and the minimum density of the densities of the additives is greater than a preset first density difference, the additives are divided into a plurality of combinations based on the density difference; Step S23, determining the order of adding the base oil and the additive combinations according to the number of additions and the density of the additive combinations; In step S3, the mixing method of adding the single combination is determined according to the maximum difference between the density of the base oil and each additive in the single combination, wherein: If the maximum difference is greater than the preset third density difference, it is determined that the mixing method of the single combined addition is spray mixing; If the maximum difference is less than or equal to the preset third density difference, the mixing method of the single combination addition is determined to be stirring mixing, and the corresponding stirring parameters are determined according to the comparison result of the calculated viscosity of each combination and the viscosity of the base oil.

2. The method for preparing a transmission oil according to claim 1, characterized in that: In step S23, the determination of the adding order includes: If the number of additions of the base oil is equal to 1, then the combinations of additives are added to the base oil in the order of their combined density from large to small; If the base oil is added more than 1 times and less than the number of combinations, the base oil is premixed with the combination with the largest combination density first, and then mixed in descending order of the density of the combination after premixing; If the number of times the base oil is added is greater than or equal to the number of combinations, the single base oil is premixed with a single combination respectively, and then the premixed combination is added to the remaining base oils in descending order of density of the premixed combination.

3. The method for preparing a transmission oil according to claim 1, characterized in that: In step S4, it includes: Step S41, during each single mixing process, monitoring the mixing uniformity of the mixture in the single mixing; Step S42, adjusting the stirring parameters or mixing method according to the mixing uniformity; Step S43, mixing the remaining combinations based on the adjusted stirring parameters or the adjusted mixing method.

4. The method for preparing a transmission oil according to claim 3, characterized in that: In the step S41, monitoring the mixing uniformity of the mixture includes: Measuring the viscosity values ​​of the components of the mixture at several positions by a viscometer, including the highest position of the liquid surface, the lowest position of the liquid surface, the middle position of the liquid surface, and at least two height positions of the inner wall of the stirring container; Judging the mixing uniformity of the mixture according to the viscosity value includes: If at least one of the viscosity values ​​exceeds the preset viscosity range, it is determined that the mixture is not mixed uniformly.

5. The method for preparing a transmission oil according to claim 3, characterized in that: In the step S42, adjusting the stirring parameters or the mixing method according to the mixing uniformity includes: When it is determined that the mixture is not mixed uniformly, the stirring parameter or the mixing method is adjusted according to the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity, wherein: If the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is greater than the preset viscosity difference, it is determined that the mixing mode of the next mixing is adjusted to spray mixing; If the difference between the viscosity value exceeding the preset viscosity range and the preset viscosity is less than or equal to the preset viscosity difference, it is determined to adjust the stirring parameters for the next mixing.

6. The method for preparing a transmission oil according to claim 1, characterized in that: Adjusting the preset number of additions includes: Obtain the result of the uniformity of the current mixing process; The adjustment method of the preset number of additions is determined according to the result of the mixing uniformity judgment, wherein: If at least one viscosity value exceeds the preset viscosity range, it is determined to increase the preset number of additions.

Images