A fully automatic method for determining the acid value of power oil

Abstract

A fully automatic determination method for the acid value of power oil, using a fully automatic determination device, the determination device comprising a titration cup, a reagent output device and a visual analysis device, wherein the reagent output device is used to add a detection reagent into the titration cup, and the visual analysis device is used to determine whether the titration end point has been reached according to the visual change of the liquid in the titration cup; the titration method comprises: obtaining the reagent titration amount in real time by the reagent output device; if the visual analysis device determines that the color change of the liquid in the titration cup has not reached the titration end point, driving the reagent output device to continue adding reagent into the titration cup; if the visual analysis device determines that the color change of the liquid in the titration cup has reached the titration end point, driving the reagent output device to stop adding reagent into the titration cup; and analyzing and calculating the oleic acid value according to the reagent titration amount when the reagent output device stops adding reagent into the titration cup.

Description

Technical Field

[0001] The present invention relates to the technical field of power oleic acid determination, in particular to a fully automatic determination method for the acid value of power oil. Background Art

[0002] There are many kinds of electrical equipment used in power plants, among which many electrical equipment need to be filled with various types of oil. The quality of the oil used in electrical equipment has a vital impact on the safe and stable operation of the equipment. In order to avoid the adverse effects of the oil quality on the operation of electrical equipment, the quality of the oil used in electrical equipment needs to be tested.

[0003] During the operation of electrical equipment, the oil used in electrical equipment will gradually be oxidized due to the influence of various factors such as air, temperature, electric field, friction, etc., thereby producing acidic substances. If the oil used in electrical equipment contains too much acidic substances, it will cause corrosion damage to the metal parts inside the electrical equipment. In addition, metal salts will be produced during the corrosion process, which will further promote the aging of the oil used in electrical equipment and cause the oil used in electrical equipment to produce more acidic substances. Therefore, in order to avoid the above problems, the oleic acid level of the oil used in electrical equipment needs to be tested regularly.

[0004] The conventional method for determining oleic acid is to add a drop of drug to the oil used in electrical equipment and observe the color change of the oil to estimate the oleic acid value. This method is relatively simple to use, but due to the unstable transmittance of some electrical oils, the final measurement result is not accurate enough. Therefore, there is an urgent need for a more accurate measurement device for electrical equipment oil. Summary of the Invention

[0005] The object of the present invention is to provide a method that enables a fully automatic measuring device to accurately measure oleic acid in equipment oil.

[0006] Therefore, the present invention discloses a fully automatic determination method of the acid value of power oil, which uses a fully automatic determination device, the determination device comprising a titration cup, a reagent output device and a visual analysis device, wherein the reagent output device is used to add a detection reagent into the titration cup, and the visual analysis device is used to determine whether the titration endpoint has been reached based on the visual changes of the liquid in the titration cup;

[0007] The titration method comprises:

[0008] The reagent output device obtains the reagent titration in real time;

[0009] If the visual analysis device determines that the color change of the liquid in the titration cup has not reached the titration endpoint, the reagent output device is driven to continuously add the reagent into the titration cup;

[0010] If the visual analysis device determines that the color change of the liquid in the titration cup reaches the titration endpoint, the reagent output device is driven to stop adding the reagent into the titration cup;

[0011] The oleic acid value is analyzed and calculated according to the reagent titration amount when the reagent output device stops adding the reagent into the titration cup.

[0012] In some embodiments of the present application, in order to automatically determine whether the liquid in the titration cup has reached the titration endpoint and accurately determine the different types of oil used in different equipment, a method for determining whether the liquid in the titration cup has reached the titration endpoint is disclosed. The method for determining whether the liquid in the titration cup has reached the titration endpoint by the visual analysis device includes:

[0013] A visual judgment table is preset, which includes several categories of oil used in electrical equipment, and a titration endpoint judgment rule is set for each category of oil used in electrical equipment;

[0014] The visual analysis device acquires a visual image of the titration cup;

[0015] The oil category of the electrical equipment is determined, and the titration endpoint judgment rule to be used is determined according to the visual judgment table, and the visual image is analyzed according to the titration endpoint judgment rule to determine whether the liquid in the titration cup has reached the titration endpoint.

[0016] In some embodiments of the present application, in order to determine whether the liquid in the titration cup has reached the titration endpoint, a specific method of the titration endpoint determination rule is disclosed. The titration endpoint determination rule includes:

[0017] Assigning a value to the color performance of the liquid in the titration cup to obtain a color performance value;

[0018] If the color value of the liquid in the titration cup is greater than the preset value, it is determined that the titration has reached the endpoint.

[0019] In some embodiments of the present application, in order to obtain the color representation value of the liquid in the titration cup, a method for assigning a value to the color of the liquid is disclosed. The method for assigning a value to the color of the liquid in the titration cup includes:

[0020] Determining the range of the titration cup in the visual image based on a visual edge detection technology, and dividing the titration cup area determined in the visual image into a plurality of unit areas;

[0021] Scanning the color characteristics of the unit area, and determining that the unit area is a color-changing unit area if the color characteristics meet a preset condition;

[0022] The color representation value of the liquid in the titration cup is determined according to the number of the color change unit areas.

[0023] In some embodiments of the present application, in order to accurately titrate the liquid in the titration cup, a method for driving the reagent output device is disclosed. The method for the visual analysis device to drive the reagent output device includes:

[0024] A color representation group A[A1, A2, A3, ..., An] is set, where A1 is a first color representation preset value, A2 is a second color representation preset value, A3 is a third color representation preset value, ..., An is an nth color representation preset value, An is a maximum color representation preset value, and A1<A2<A3<...<An;

[0025] A power adjustment corresponding group B [B1, B2, B3, ..., Bn] is set for the reagent output device, where B1 is a first power output value, B2 is a second power output value, B3 is a third power output value, ..., Bn is an nth power output value, wherein the nth power output value Bn is a zero power output value, and B1>B2>B3>...>Bn;

[0026] Determining the color representation value a;

[0027] If a≤A1, the first power output value B1 is used as the output power of the reagent output device;

[0028] If A1<a≤A2, the second power output value B2 is used as the output power of the reagent output device;

[0029] If A2<a≤A3, the third power output value B3 is used as the output power of the reagent output device;

[0030] …;

[0031] If An-1<a≤An, the nth power output value Bn is used as the output power of the reagent output device.

[0032] In some embodiments of the present application, in order to avoid the influence of environmental background, a single-color background layer is provided on the side of the titration cup.

[0033] In some embodiments of the present application, in order to ensure that the temperature of the liquid in the titration cup is stable so that the chemical reaction occurring therein is consistent, the measuring device is improved. The measuring device also includes a temperature measuring device and a temperature increasing device. The temperature measuring device and the temperature increasing device are both provided on the titration cup. The temperature measuring device is used to measure the temperature of the liquid in the titration cup, and the temperature increasing device is used to increase the temperature of the liquid in the titration cup.

[0034] A real-time temperature value detected by the temperature measuring device is obtained. If the real-time temperature value is less than a preset standard reaction temperature value, the heating device is driven to heat the liquid in the titration cup according to the standard heating power. When the real-time temperature value reaches the standard reaction temperature value, the standard heating power is multiplied to obtain a real-time heat preservation power, so that the real-time difference between the real-time temperature value in the titration cup and the standard reaction temperature value is less than a preset value.

[0035] In some embodiments of the present application, in order to keep the liquid in the titration cup warm, a method for adjusting the rate of the standard heating power is disclosed. The method for adjusting the rate of the standard heating power includes:

[0036] Obtaining a real-time temperature value q detected by the temperature measuring device, and calculating and determining a real-time temperature difference h between the real-time temperature value q and a standard reaction temperature value T, where h=|Tq|;

[0037] The standard heating power is linearly adjusted based on the real-time temperature difference h.

[0038] In some embodiments of the present application, a method for adjusting the rate of the standard heating power is specifically disclosed, and the method for adjusting the rate of the standard heating power also includes:

[0039] A temperature difference corresponding group H [H1, H2, H3, ..., Hn] is set, wherein H1 is a first preset temperature difference, H2 is a second preset temperature difference, H3 is a third preset temperature difference, ..., Hn is an nth preset temperature difference, and H1 < H2 < H3 < ... < Hn;

[0040] A power ratio corresponding group Z [Z1, Z2, Z3, ..., Zn] is set, where Z1 is a first preset power ratio, Z2 is a second preset power ratio, Z3 is a third preset power ratio, ..., Zn is an nth preset power ratio, and Z1 < Z2 < Z3 < ... < Zn;

[0041] Determine the real-time temperature difference h;

[0042] When h≤H1, the first preset power ratio Z1 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z1*W;

[0043] When H1<h≤H2, the second preset power ratio Z2 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z2*W;

[0044] When H2<h≤H3, the third preset power ratio Z3 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z3*W;

[0045] …;

[0046] When Hn-1<h≤Hn, the nth preset power ratio Zn is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Zn*W.

[0047] In some embodiments of the present application, in order to allow the liquid in the titration cup to fully react, the measuring device is improved, and the measuring device further includes a magnetic stirring device;

[0048] The magnetic stirring device determines the stirring speed according to the height of the top boundary of the liquid in the titration cup, so as to fully stir the liquid in the titration cup;

[0049] The method for determining the stirring speed of the magnetic stirring device includes:

[0050] The visual analysis device acquires a visual image of the titration cup, and determines the range of the titration cup in the visual image and the height of the liquid top boundary based on a visual edge detection technique;

[0051] If the height of the top boundary of the liquid is lower than the preset standard height, the stirring speed of the magnetic stirring device is increased until the difference between the top boundary height of the liquid and the preset standard height is less than the preset value; if the height of the top boundary of the liquid is higher than the preset standard height, the stirring speed of the magnetic stirring device is reduced until the difference between the top boundary height of the liquid and the preset standard height is less than the preset value.

[0052] The present application discloses a fully automatic method for determining the acid value of power oil. Compared with general determination methods, the method used in this application has the following technical advantages:

[0053] 1. A fully automatic measuring device is used. The fully automatic device is equipped with a visual analysis device, which can monitor the color mutation of the liquid in the titration cup through the visual analysis device, which is more accurate than manual analysis.

[0054] 2. The fully automatic measuring device is also equipped with a reagent output device. The visual analysis device monitors the sudden color change of the liquid in the titration cup, and drives the reagent output device to titrate the reagent into the titration cup according to the monitoring situation, making the titration more accurate.

[0055] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1This is a schematic structural diagram of a fully automatic device for determining the acid value of power oil according to an embodiment of the present application;

[0057] Figure 2 This is a step diagram of a method for determining the titration endpoint by a visual analysis device in an embodiment of the present application;

[0058] Figure 3 This is a step diagram of a method for driving the magnetic stirring device in an embodiment of the present application.

[0059] Reference numerals

[0060] 1. Titration cup; 2. Reagent output device; 3. Visual analysis device; 4. Monochrome background layer; 5. Temperature measurement device; 6. Heating device; 7. Magnetic stirring device. DETAILED DESCRIPTION

[0061] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0062] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0063] Example:

[0064] In view of the problems of unstable oil sample transmittance and low accuracy and precision of test results in the determination of the acid value of equipment oil, the purpose of the present invention is to provide a method that enables a fully automatic measuring device to accurately measure oleic acid in equipment oil.

[0065] Therefore, the present invention discloses a method for fully automatic determination of acid value of oil for power use, see Figure 1 A fully automatic measuring device is used, which includes a titration cup 1, a reagent output device 2 and a visual analysis device 3, wherein the reagent output device 2 is used to add detection reagent into the titration cup 1, and the visual analysis device 3 is used to determine whether the titration end point is reached based on the visual changes of the liquid in the titration cup 1.

[0066] The titration method comprises:

[0067] The reagent titration amount is obtained in real time by the reagent output device 2 .

[0068] If the visual analysis device 3 determines that the color change of the liquid in the titration cup 1 has not reached the titration endpoint, the reagent output device 2 is driven to continuously add reagent into the titration cup 1 .

[0069] If the visual analysis device 3 determines that the color change of the liquid in the titration cup 1 reaches the titration endpoint, the reagent output device 2 is driven to stop adding the reagent into the titration cup 1 .

[0070] The oleic acid value is analyzed and calculated according to the reagent titration amount when the reagent output device 2 stops adding the reagent into the titration cup 1 .

[0071] In some embodiments of the present application, in order to avoid the influence of the environmental background, a single-color background layer 4 is provided on the side of the titration cup 1 .

[0072] In some embodiments of the present application, in order to automatically determine whether the liquid in the titration cup 1 has reached the titration endpoint and accurately determine the different equipment oils, a method for determining whether the liquid in the titration cup 1 has reached the titration endpoint is disclosed. The method for determining whether the liquid in the titration cup 1 has reached the titration endpoint by the visual analysis device 3 includes:

[0073] A visual judgment table is preset, which includes several categories of oil used in electrical equipment, and a titration endpoint judgment rule is set for each category of oil used in electrical equipment.

[0074] See Figure 2 The visual judgment table includes several types of equipment oil, including but not limited to compressor oil, turbine oil, and fire-resistant oil. The light transmittance of these types of equipment oil is different, and the color mutation performance shown in the titration experiment is also different. Therefore, for different equipment oils, the light transmittance of different equipment oils should be combined to make judgments to generate different titration endpoint judgment rules.

[0075] Step S100: The visual analysis device acquires a visual image of the titration cup.

[0076] Step S200 , determining the oil type of the electrical equipment, and determining the titration endpoint judgment rule to be used according to the visual judgment table, and analyzing the visual image according to the titration endpoint judgment rule to determine whether the liquid in the titration cup has reached the titration endpoint.

[0077] In some embodiments of the present application, in order to determine whether the liquid in the titration cup 1 has reached the titration endpoint, a specific method of the titration endpoint determination rule is disclosed. The titration endpoint determination rule includes:

[0078] The color performance of the liquid in the titration cup 1 is assigned a value to obtain a color performance value.

[0079] If the color value of the liquid in the titration cup 1 is greater than a preset value, it is determined that the titration has reached the endpoint.

[0080] It should be noted that different equipment uses different oils and has different titration endpoint judgment rules, and the color of the liquid is assigned based on different criteria. In comparison, for liquids with obvious color changes, the assigned value is smaller than for liquids with insignificant color changes under the same color performance conditions.

[0081] In some embodiments of the present application, in order to obtain the color value of the liquid in the titration cup 1, a method for assigning a value to the color of the liquid is disclosed. The method for assigning a value to the color of the liquid in the titration cup 1 includes:

[0082] In the first step, the range of the titration cup in the visual image is determined based on the visual edge detection technology, and the titration cup area determined in the visual image is divided into a number of unit areas.

[0083] In the second step, the color feature of the unit area is scanned. If the color feature meets the preset conditions, the unit area is determined to be a color-changing unit area.

[0084] The color characteristics mentioned here need to be understood in conjunction with the above-mentioned assignment of different color expressions. For oils used in different equipment, the color characteristics of oils used in different equipment are different due to their own different light transmittance.

[0085] The third step is to determine the color value of the liquid in the titration cup according to the number of the color changing unit areas.

[0086] The color expression value mentioned here is proportional to the number of color-changing unit areas, or it can be understood that the number of color-changing unit areas is equal to the color expression value.

[0087] In some embodiments of the present application, in order to accurately titrate the liquid in the titration cup 1, a method for driving the reagent output device 2 is disclosed. The method for the visual analysis device 3 to drive the reagent output device 2 includes:

[0088] In the first step, a color representation group A[A1, A2, A3, ..., An] is set, where A1 is the first color representation preset value, A2 is the second color representation preset value, A3 is the third color representation preset value, ..., An is the nth color representation preset value, where An is the maximum color representation preset value, and A1<A2<A3<...<An.

[0089] It should be understood that the maximum color expression preset value An corresponds to the color expression of the liquid in the titration cup 1 at the titration endpoint.

[0090] In the second step, a power adjustment corresponding group B [B1, B2, B3, ..., Bn] is set for the reagent output device, where B1 is the first power output value, B2 is the second power output value, B3 is the third power output value, ..., Bn is the nth power output value, wherein the nth power output value Bn is the 0 power output value, and B1>B2>B3>...>Bn.

[0091] The third step is to determine the color representation value a.

[0092] Step 4: If a≤A1, the first power output value B1 is used as the output power of the reagent output device.

[0093] Step 5: If A1<a≤A2, the second power output value B2 is used as the output power of the reagent output device 2.

[0094] Step 6: If A2<a≤A3, the third power output value B3 is used as the output power of the reagent output device 2.

[0095] ….

[0096] In the nth step, if An-1<a≤An, the nth power output value Bn is used as the output power of the reagent output device 2.

[0097] In some embodiments of the present application, in order to ensure that the temperature of the liquid in the titration cup 1 is stable so that the chemical reaction occurring therein is consistent, the measuring device is improved. The measuring device also includes a temperature measuring device 5 and a temperature increasing device 6. The temperature measuring device 5 and the temperature increasing device 6 are both arranged on the titration cup 1. The temperature measuring device 5 is used to measure the temperature value of the liquid in the titration cup 1, and the temperature increasing device 6 is used to increase the temperature of the liquid in the titration cup 1.

[0098] Obtain the real-time temperature value detected by the temperature measuring device 5. If the real-time temperature value is less than the preset standard reaction temperature value, drive the heating device 6 to heat the liquid in the titration cup 1 at the standard heating power. When the real-time temperature value reaches the standard reaction temperature value, perform a magnification adjustment on the standard heating power to obtain the real-time heat preservation power, so that the real-time difference between the real-time temperature value and the standard reaction temperature value in the titration cup 1 is less than the preset value.

[0099] In some embodiments of the present application, in order to be able to heat-preserve the liquid in the titration cup 1, a method for performing a magnification adjustment on the standard heating power is disclosed. The method for performing a magnification adjustment on the standard heating power includes:

[0100] First step, obtain the real-time temperature value q detected by the temperature measuring device, and calculate and determine the real-time temperature difference h between the real-time temperature value q and the standard reaction temperature value T, where h = |T - q|.

[0101] Second step, perform a linear magnification adjustment on the standard heating power according to the real-time temperature difference h.

[0102] In some embodiments of the present application, the method for performing a magnification adjustment on the standard heating power is specifically disclosed. The manner for performing a magnification adjustment on the standard heating power further includes:

[0103] First step, set a temperature difference corresponding group H [H1, H2, H3,..., Hn], where H1 is the first preset temperature difference, H2 is the second preset temperature difference, H3 is the third preset temperature difference,..., Hn is the nth preset temperature difference, and H1 < H2 < H3 <... < Hn.

[0104] Second step, set a power magnification corresponding group Z [Z1, Z2, Z3,..., Zn], where Z1 is the first preset power magnification, Z2 is the second preset power magnification, Z3 is the third preset power magnification,..., Zn is the nth preset power magnification, and Z1 < Z2 < Z3 <... < Zn.

[0105] Third step, determine the real-time temperature difference h.

[0106] Fourth step, when h ≤ H1, then use the first preset power magnification Z1 as the adjustment magnification of the standard heating power W to obtain the real-time heat preservation power P = Z1 * W.

[0107] Fifth step, when H1 < h ≤ H2, then use the second preset power magnification Z2 as the adjustment magnification of the standard heating power W to obtain the real-time heat preservation power P = Z2 * W.

[0108] Step 6: When H2<h≤H3, the third preset power ratio Z3 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z3*W.

[0109] ….

[0110] In step n, when Hn-1<h≤Hn, the nth preset power ratio Zn is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Zn*W.

[0111] In some embodiments of the present application, in order to allow the liquid in the titration cup 1 to fully react, the measuring device is improved, and the measuring device further includes a magnetic stirring device 7;

[0112] The magnetic stirring device 7 determines the stirring speed according to the height of the top boundary of the liquid in the titration cup 1 , so as to fully stir the liquid in the titration cup 1 .

[0113] See Figure 3 , the method for determining the stirring speed of the magnetic stirring device includes:

[0114] In step S300 , the visual analysis device acquires a visual image of the titration cup, and determines the range of the titration cup in the visual image and the height of the liquid top boundary based on a visual edge detection technique.

[0115] Step S400: If the height of the top boundary of the liquid is lower than the preset standard height, the stirring speed of the magnetic stirring device is increased until the difference between the height of the top boundary of the liquid and the preset standard height is smaller than a preset value.

[0116] Step S500: If the height of the top boundary of the liquid is higher than the preset standard height, the stirring speed of the magnetic stirring device is reduced until the difference between the height of the top boundary of the liquid and the preset standard height is less than a preset value.

[0117] In some embodiments of the present application, in order to further illustrate the technical solution of the present application, a specific technical solution is now integrated for explanation.

[0118] A fully automatic measuring device is used, which includes a titration cup 1, a reagent output device 2, a visual analysis device 3, a temperature measuring device 5, a temperature increasing device 6 and a magnetic stirring device 7.

[0119] The conventional titration principle is: first add a certain amount of equipment oil into the titration cup 1, then add a color-changing indicator, and finally add an alkaline reagent. After the alkaline reagent and the oleic acid in the equipment oil are completely neutralized, the color-changing indicator undergoes a sudden change in color due to the influence of the alkaline reagent. At this time, the amount of alkaline reagent added can be calculated to calculate the amount of oleic acid in the equipment oil.

[0120] The reagent output device 2 is used to add detection reagent to the titration cup 1. The visual analysis device 3 is used to determine whether the titration endpoint has been reached based on the visual changes of the liquid in the titration cup 1. The temperature measuring device 5 is used to measure the temperature of the liquid in the titration cup 1. The heating device 6 is used to heat the liquid in the titration cup 1. The magnetic stirring device 7 is used to stir the liquid in the titration cup 1.

[0121] The visual analysis device 3 analyzes the color change of the liquid in the titration cup 1 and, based on the analysis results, drives the reagent output device 2 to add reagent into the titration cup 1 until the color characteristics of the titration cup 1 reach a preset characteristic performance. The reagent addition rate of the reagent output device 2 is gradually adjusted according to the color characteristics of the liquid in the titration cup 1 to avoid inaccurate oleic acid measurement caused by excessive addition of reagent when a color mutation occurs. When the color characteristics of the liquid in the titration cup 1 completely reach the preset performance, the reagent output device 2 is driven to stop adding reagent into the titration cup 1.

[0122] The temperature measuring device 5 monitors the temperature of the liquid in the titration cup 1 in real time. If the temperature does not reach the preset temperature value, the heating device 6 is driven to heat the liquid in the titration cup 1. After the temperature reaches the specified temperature value, the heating power of the heating device 6 is adjusted by a multiplier to keep the liquid in the titration cup 1 warm, so as to make the titration detection result more accurate.

[0123] When the magnetic stirring device 7 stirs the liquid in the titration cup 1, in order to avoid poor stirring effect, the stirring speed needs to be controlled. The control method is as follows: the visual analysis device 3 analyzes whether the top boundary of the liquid is within the specified height range. If the height of the top boundary of the liquid is higher than the specified height range, it means that the liquid has formed a large vortex in the titration cup 1, which will inevitably lead to poor stirring effect. Therefore, the magnetic stirring device 7 is driven to reduce the speed. If the top boundary is lower than the specified height range, it will also lead to poor stirring effect. Therefore, the magnetic stirring device 7 is driven to increase the speed.

[0124] The present application discloses a fully automatic method for determining the acid value of power oil. Compared with general determination methods, the method used in this application has the following technical advantages:

[0125] 1. A fully automatic measuring device is used. The fully automatic device is equipped with a visual analysis device, which can monitor the color mutation of the liquid in the titration cup through the visual analysis device, which is more accurate than manual analysis.

[0126] 2. The fully automatic measuring device is also equipped with a reagent output device. The visual analysis device monitors the sudden color change of the liquid in the titration cup, and drives the reagent output device to titrate the reagent into the titration cup according to the monitoring situation, making the titration more accurate.

[0127] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A fully automatic method for determining the acid value of power oil, characterized in that: Applicable to a fully automatic measuring device, the measuring device comprises a titration cup, a reagent output device and a visual analysis device, wherein the reagent output device is used to add a detection reagent into the titration cup, and the visual analysis device is used to determine whether the titration endpoint is reached according to the visual changes of the liquid in the titration cup; The method for fully automatic determination of acid value of power oil comprises: The reagent output device obtains the reagent titration amount in real time; If the visual analysis device determines that the color change of the liquid in the titration cup has not reached the titration endpoint, the reagent output device is driven to continuously add the reagent into the titration cup; If the visual analysis device determines that the color change of the liquid in the titration cup reaches the titration endpoint, the reagent output device is driven to stop adding the reagent into the titration cup; Analyze and calculate the oleic acid value according to the reagent titration amount when the reagent output device stops adding the reagent into the titration cup; The method for the visual analysis device to determine whether the liquid in the titration cup has reached the titration endpoint includes: A visual judgment table is preset, which includes several types of oil used in electrical equipment, and a titration endpoint judgment rule is set for each type of oil used in electrical equipment; The visual analysis device acquires a visual image of the titration cup; Determine the type of oil used in the electrical equipment, and determine the titration endpoint judgment rule to be used according to the visual judgment table, and analyze the visual image according to the titration endpoint judgment rule to determine whether the liquid in the titration cup has reached the titration endpoint; The titration endpoint judgment rule includes: Assigning a value to the color performance of the liquid in the titration cup to obtain a color performance value; If the color value of the liquid in the titration cup is greater than the preset value, it is determined that the titration has reached the endpoint; The method for assigning a value to the color of the liquid in the titration cup comprises: Determine the range of the titration cup in the visual image according to the visual edge detection technology, and divide the titration cup area determined in the visual image into a plurality of unit areas; Scanning the color characteristics of the unit area, and if the color characteristics meet the preset conditions, determining that the unit area is a color-changing unit area; Determining the color value of the liquid in the titration cup according to the number of the color changing unit areas; The measuring device further comprises a temperature measuring device and a heating device, both of which are arranged on the titration cup, the temperature measuring device is used to measure the temperature value of the liquid in the titration cup, and the heating device is used to heat the liquid in the titration cup; Acquire the real-time temperature value detected by the temperature measuring device. If the real-time temperature value is less than the preset standard reaction temperature value, drive the heating device to heat the liquid in the titration cup according to the standard heating power. When the real-time temperature value reaches the standard reaction temperature value, adjust the standard heating power by a factor to obtain the real-time heat preservation power, so that the real-time difference between the real-time temperature value in the titration cup and the standard reaction temperature value is less than the preset value. The method for adjusting the rate of the standard heating power includes: Obtaining a real-time temperature value q detected by the temperature measuring device, and calculating and determining a real-time temperature difference h between the real-time temperature value q and a standard reaction temperature value T, wherein h=|Tq|; According to the real-time temperature difference h, the standard heating power is linearly adjusted; The method of adjusting the rate of the standard heating power also includes: A temperature difference corresponding group H [H1, H2, H3, ..., Hn] is set, wherein H1 is a first preset temperature difference, H2 is a second preset temperature difference, H3 is a third preset temperature difference, ..., Hn is an nth preset temperature difference, and H1<H2<H3<...<Hn; A power ratio corresponding group Z [Z1, Z2, Z3, ..., Zn] is set, wherein Z1 is a first preset power ratio, Z2 is a second preset power ratio, Z3 is a third preset power ratio, ..., Zn is an nth preset power ratio, and Z1 < Z2 < Z3 < ... < Zn; Determine the real-time temperature difference h; When h≤H1, the first preset power ratio Z1 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z1*W; When H1<h≤H2, the second preset power ratio Z2 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z2*W; When H2<h≤H3, the third preset power ratio Z3 is used as the adjustment ratio of the standard heating power W to obtain the real-time heat preservation power P=Z3*W; …； When Hn-1<h≤Hn, the nth preset power factor Zn is used as the adjustment factor of the standard heating power W to obtain the real-time heat preservation power P=Zn*W; The method for the visual analysis device to drive the reagent output device includes: A color representation group A[A1, A2, A3, ..., An] is set, wherein A1 is a first color representation preset value, A2 is a second color representation preset value, A3 is a third color representation preset value, ..., An is an nth color representation preset value, wherein An is a maximum color representation preset value, and A1<A2<A3<...<An; A power adjustment corresponding group B [B1, B2, B3, ..., Bn] is set for the reagent output device, wherein B1 is a first power output value, B2 is a second power output value, B3 is a third power output value, ..., Bn is an nth power output value, wherein the nth power output value Bn is a 0 power output value, and B1>B2>B3>...>Bn; Determining the color representation value a; If a≤A1, the first power output value B1 is used as the output power of the reagent output device; If A1<a≤A2, the second power output value B2 is used as the output power of the reagent output device; If A2<a≤A3, the third power output value B3 is used as the output power of the reagent output device; …； If An-1<a≤An, the nth power output value Bn is used as the output power of the reagent output device.

2. A method for fully automatic determination of acid value of power oil according to claim 1, characterized in that: A monochrome background layer is arranged on the side of the titration cup.

3. The method for fully automatic determination of acid value of power oil according to claim 1, characterized in that: The measuring device also includes a magnetic stirring device; The magnetic stirring device determines the stirring speed according to the height of the top boundary of the liquid in the titration cup, so as to fully stir the liquid in the titration cup; The method for determining the stirring speed of the magnetic stirring device comprises: The visual analysis device acquires a visual image of the titration cup, and determines the range of the titration cup in the visual image and the height of the top boundary of the liquid based on a visual edge detection technique; If the height of the top boundary of the liquid is lower than the preset standard height, the stirring speed of the magnetic stirring device is increased until the difference between the top boundary height of the liquid and the preset standard height is less than the preset value; if the height of the top boundary of the liquid is higher than the preset standard height, the stirring speed of the magnetic stirring device is reduced until the difference between the top boundary height of the liquid and the preset standard height is less than the preset value.

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