CN114062232B - Automatic measuring system and method for thermal oxidative aging life of baking oven and polymer material - Google Patents
Automatic measuring system and method for thermal oxidative aging life of baking oven and polymer material Download PDFInfo
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Abstract
The invention relates to the technical field of ageing life test of polymer materials, in particular to an oven, a system and a method for automatically measuring the thermal oxidation ageing life of the polymer materials.
Description
Technical Field
The invention relates to the technical field of polymer material aging life test, in particular to an oven, and a system and a method for automatically measuring the thermal oxidative aging life of a polymer material.
Background
The polymer material has chalking characteristics after being subjected to long-term high-temperature aging, and the aging degree of the material can be directly judged through the apparent chalking degree of the material. In the actual thermal oxidation aging process of the polymer material, the existing oven device cannot directly observe the pulverization condition of the surface of the material in the high-temperature state of the oven, frequent sampling can cause the temperature fluctuation of the oven, deviation occurs between the temperature fluctuation and the actual temperature of the oven, and meanwhile, the working efficiency and the usability are lower. Chinese patent CN213275298U discloses a multilayer film oven comprising: the box body is internally provided with a plurality of illuminating lamps at two sides and square glass windows at the outer part; a rotation shaft vertically disposed inside the case; a plurality of fixed rings detachably connected to the turntable; the lower end surfaces of the fixing rings are provided with cylindrical protrusions corresponding to the round holes on the rotary table. This scheme has placed a plurality of flourishing appearance wares simultaneously, shortens test cycle, but is used for carrying out the thermal oxidation ageing time to the polymer material, can't the surface pulverization condition of direct observation sample, needs frequent unpacking sample, leads to the inside temperature of oven to appear the deviation, reduces oven performance and work efficiency.
In addition, when there are few thermo-oxidative ageing pictures, the picture is usually identified by manually performing thermo-oxidative ageing on the picture. However, with the increase of testing workload, hundreds of pictures are generally required to be identified and classified, a manual processing mode becomes impractical, labor is consumed, and the accuracy of the subsequent thermal oxidative aging life measurement of the polymer material cannot be guaranteed. Chinese patent CN111562241a discloses a method for detecting aging of a polymer material and analyzing the process, which aims at generating a specific functional group in the aging process of the polymer, and selects a specific fluorescent probe molecule to perform a post-dyeing treatment of targeting effect on the functional group, so that the aging point of the polymer material is marked by fluorescence to show a change of fluorescent signal due to the change of the functional group, and through collecting the fluorescent signal, the multi-dimensional visual monitoring of the aging point is realized, and the aging reaction rate constant under different dimensions is obtained.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides an automatic measuring system and method for the thermal oxidative aging life of a baking oven and a polymer material, which can avoid frequent box opening and sampling by taking sample pictures, avoid the problem of deviation of the temperature in the baking oven caused by frequent box opening, are beneficial to improving the testing stability and the working efficiency, judge the aging degree of the sample by utilizing an identification model, and simplify the testing process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the oven comprises an oven body and an oven door hinged with the oven body, wherein a sample rack for placing samples is arranged in the oven body, and a heating device is arranged in the oven body; the box door is provided with a camera.
According to the oven disclosed by the invention, the heating device is arranged in the oven body, the heating device can heat and age the sample placed on the sample rack, the sample can be shot by the camera, whether the sample is aged or not is judged to be invalid according to the shot sample picture, the problem that the temperature in the oven body is deviated due to frequent opening of the oven is avoided, and the testing stability and the working efficiency are improved. When the invention is used for carrying out thermal oxidation aging on polymer materials, the heating device is used for carrying out thermal oxidation aging on the polymer materials, the camera can directly shoot pictures of the polymer materials, the aging degree of the polymer materials can be conveniently judged according to the pulverization condition of the surfaces of the materials, frequent box opening and sampling are avoided, the working efficiency is improved, and the temperature fluctuation in the oven caused by frequent box opening is avoided, thereby being beneficial to improving the test stability and the reliability of test results.
Further, a driver is arranged on the outer side of the box body, an output shaft of the driver is connected with the sample frame, and the driver drives the sample frame to rotate.
Further, the sample rack comprises a rotating shaft, rotating discs, fixing strips and sample frames, wherein the rotating shaft is horizontally arranged in the box body, two ends of the rotating shaft are respectively arranged in the box body, the rotating discs are respectively and fixedly connected with two ends of the rotating shaft, two ends of the fixing strips are respectively connected with the two rotating discs, and the sample frames are detachably connected with the fixing strips; an output shaft of the driver is connected with the rotating shaft, and the driver drives the rotating shaft to rotate so as to drive the sample rack to rotate;
further, the heating device comprises a hot air blower for horizontally feeding hot air to the sample frame, and the hot air blower is arranged at the bottom of the inner side of the side wall of the box body.
Further, the box body is provided with an air inlet and an air outlet, air enters the box body from the air inlet, and is discharged from the air outlet after being heated by the heating device.
The invention also provides an automatic measurement system for the thermal oxidation aging life of the polymer material, which comprises the oven and the machine case, wherein the machine case comprises a control module, a calculation module, a display screen, an acquisition module for acquiring a gallery and a training sample set, an identification module for identifying whether a picture to be processed is a failure picture, a storage module for storing the failure picture and a warning module for warning, the camera and the heating device are respectively connected with the control module, the acquisition module is connected with the camera, the storage module and the warning module are respectively connected with the identification module, the calculation module is connected with the storage module, and the display screen is connected with the calculation module.
According to the automatic measurement system for the thermal oxidation aging life of the polymer material, the heating device is controlled to be started through the control module, the thermal oxidation aging is carried out on the polymer material sample, the camera in the oven is controlled to shoot the polymer material sample through the control module, the shot picture is input into the identification module to be identified through the acquisition module, the identification module stores the identified failure picture into the storage module and sends out warning through the warning module, the thermal oxidation aging life of the polymer material is calculated through the analysis of the failure picture through the calculation module, and the thermal oxidation aging life of the polymer material is displayed through the display screen. According to the invention, the camera arranged in the box body can be used for directly shooting the sample picture, so that frequent box opening and sampling are avoided, the working efficiency is improved, the temperature fluctuation in the oven caused by frequent box opening is avoided, the test stability is improved, the influence of the temperature fluctuation on the ageing degree of the material can be reduced when the shot picture is identified, and the reliability of automatic measurement of the thermal oxidation ageing life of the polymer material is improved.
The invention also provides an automatic measurement method for the thermal oxidation aging life of the polymer material, which is applied to the automatic measurement system for the thermal oxidation aging life of the polymer material, and comprises the following steps:
s1: placing the sample into a sample rack, closing a box door, presetting the temperature in the box body, setting the shooting period of a camera, starting a heating device to age the sample, and recording the initial time t 0 ；
S2: shooting a sample by using a camera according to a shooting period to obtain a gallery, and recording shooting time t 'of each shooting' 0 ；
S3: obtaining a gallery from a camera by using an obtaining module, wherein the gallery comprises at least one picture to be processed;
s4: respectively inputting the pictures to be processed into an identification module, and identifying the pictures to be processed by using the identification module;
s5: judging whether the picture to be processed is a failure picture, if so, inputting the failure picture into a storage module for storage, controlling the reminding module to send out a warning, and turning to the step S6; if not, repeating the step S2;
s6: according to the initial time t of a plurality of failure pictures 0 And a shooting time t' 0 Calculating the thermal oxidative aging life t of the polymer material by utilizing an Arrhenius formula u 。
According to the automatic measurement method for the thermal oxidation aging life of the polymer material, disclosed by the invention, a sample is placed in a sample frame, after a box door is closed, the temperature in the box body is preset, the shooting period of a camera is set, a heating device is started, the heating device is used for heating and aging the sample, meanwhile, the initial time is recorded, a gallery is obtained according to pictures shot by the camera, meanwhile, the shooting time of each shooting of the camera is recorded, the pictures to be processed, which are obtained from the camera, are input into an identification module to be identified by utilizing an acquisition module, whether the pictures to be processed are failure pictures or not can be conveniently judged, the working efficiency is improved, after the failure pictures are identified, the failure pictures are stored in a storage module and are triggered to be sent out to be warned, and then the thermal oxidation aging life of the polymer material is calculated and obtained by utilizing an Arrhenius formula according to the initial time and the shooting time of the failure pictures, so that the automatic measurement of the thermal oxidation aging life of the polymer material is completed. According to the invention, the camera can be utilized to directly shoot a sample picture, so that frequent box opening and sampling are avoided, the working efficiency is improved, the temperature fluctuation in the oven caused by frequent box opening is avoided, the testing stability is improved, the influence of the temperature fluctuation on the ageing degree of the material can be reduced when the shot picture is identified, and the reliability of automatic measurement of the thermal oxidation ageing life of the polymer material is improved.
Preferably, in step S4, before the image to be processed is processed by using the recognition module, a thermo-oxidative aging image recognition model needs to be built, which specifically includes the following steps:
s41: acquiring a first training sample set, wherein the first training sample set comprises a first type of training picture and a second type of training picture, the first type of training picture is a failure picture, and the second type of training picture is a non-failure picture;
s42: and inputting the first training pictures and the second training pictures into an initial thermal-oxidative aging picture identification model randomly, and training characteristic coefficients in the initial thermal-oxidative aging picture identification model to obtain a thermal-oxidative aging picture identification model.
Preferably, the method further comprises:
s43: acquiring a second training sample set, wherein the second training sample set comprises a third type of test picture and a fourth type of test picture, the third type of test picture is a failure picture, and the fourth type of test picture is a non-failure picture;
s44: and randomly inputting the third type of test pictures and the fourth type of test pictures into the thermal-oxidative aging picture identification model, training the characteristic coefficients in the thermal-oxidative aging picture identification model, and improving the classification accuracy of the thermal-oxidative aging picture identification model.
Preferably, in step S6, the polymeric material has a thermal oxidative aging life t u The specific calculation process of (2) is as follows: from Arrhenii Wu Sigong, it is known that:
wherein k (t) i ) Represents the rate of thermooxidative aging, T i For the temperature t of the inside of the ith preset box i Is T i The thermal oxidation aging time in the process is that A represents a factor before, E represents reaction activation energy, and R represents a gas constant;
can be obtained
Then ln t i And (3) withIs in linear relation with t i ＝t′ 0i -t 0i ，
Wherein t is 0i Is T i Initial time of time-lapse picture, t' 0i Is T i Time of shooting the failure picture;
by aligningFitting to obtain +.>And lnA, and thus can be:
in the method, in the process of the invention,T u is the thermal oxidative aging life t of a polymer material u Corresponding thermo-oxidative aging temperature.
Compared with the background technology, the oven and the system and the method for automatically measuring the thermal oxidative aging life of the polymer material have the following beneficial effects:
the aging degree of the sample can be judged by shooting a sample picture, frequent box opening and sampling are avoided, and the working efficiency is improved; the problem of deviation of the temperature inside the oven caused by frequent opening of the oven is avoided, and the test stability is improved; the driver can be used for driving the sample rack to circularly rotate, so that samples placed on the sample rack are heated uniformly; judging whether the sample fails or not by using the identification model according to the shot picture, simplifying the test process and improving the test efficiency; when the photographed picture is identified, the influence of temperature fluctuation on the aging degree of the material can be reduced, and the reliability of automatic measurement of the thermal oxidative aging life of the polymer material is improved.
Drawings
FIG. 1 is a schematic diagram of an oven according to an embodiment of the present invention;
FIG. 2 is a schematic view of a sample holder according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of an automatic measurement system for thermal oxidative aging life of a polymer material according to a second embodiment of the present invention;
FIG. 4 is a flow chart of an automatic measurement method for thermal oxidative aging life of a polymer material according to a third embodiment of the present invention;
FIG. 5 is a flowchart of a thermal oxidative aging identification model setup in a third embodiment of the present invention;
in the accompanying drawings: 1-a box body; 11-an air inlet; 12-an air outlet; 2-a box door; 21-an inner window; 22-a camera; 23-handle; a 3-driver; 4-a case; 41-a display screen; 42-a control module; 43-an acquisition module; 44 an identification module; 45-a memory module; 46, a reminding module; a 47-calculation module; 5-sample holder; 51-a rotation axis; 52-a turntable; 53-fixing strips; 54-sample frame; 55-hook.
Detailed Description
The invention is further described below in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Example 1
As shown in fig. 1, the oven comprises a box body 1 and a box door 2 hinged with the box body 1, wherein a sample rack 5 for placing samples is arranged in the box body 1, and a heating device is arranged in the box body 1; the door 2 is provided with a camera 22.
Foretell oven is provided with heating device in box 1 inside, and heating device can heat ageing to placing the sample on sample frame 5, and the accessible camera 22 is shot the sample, judges whether ageing inefficacy of sample according to the sample picture of taking, avoids frequently opening the problem that the oven inside temperature that the case leads to appears deviating, is favorable to improving test stability and work efficiency. When the invention is used for carrying out thermal oxidation aging on polymer materials, the heating device is used for carrying out thermal oxidation aging on the polymer materials, the camera 22 can directly shoot pictures of the polymer materials, the aging degree of the polymer materials can be conveniently judged according to the pulverization condition of the surfaces of the materials, frequent opening and sampling are avoided, the working efficiency is improved, and the temperature fluctuation in the oven caused by frequent opening of the oven is avoided, so that the invention is beneficial to improving the test stability and the reliability of the test result.
As shown in fig. 1, a driver 3 is arranged outside the box body 1, an output shaft of the driver 3 is connected with the sample holder 5, and the driver drives the sample holder 5 to rotate. Specifically, as shown in fig. 2, the sample holder 5 includes a rotation shaft 51, a turntable 52, a fixing strip 53 and a sample frame 54, the rotation shaft 51 is horizontally disposed in the case 1, two ends of the rotation shaft 51 are respectively mounted in the case 1, two ends of the rotation shaft 51 are respectively fixedly connected with the turntable 52, two ends of the fixing strip 53 are respectively connected with the two turntables 52, and the sample frame is detachably connected with the fixing strip 53; the output shaft of the driver 3 is connected with the rotating shaft 51, when the heating device heats the sample, the driver 3 is started to enable the rotating shaft 51 to rotate, the rotating disc 52 is driven to rotate, and then the plurality of sample frames 54 are driven to circularly rotate, so that the samples on the plurality of sample frames 5 can be uniformly heated.
Specifically, the turntables 52 are ring-shaped, two ends of the fixing strips 53 are respectively connected to the circumferences of the two turntables 52, the sample frames 54 are plate-shaped, and two ends of the sample frames 54 are respectively connected with two ends of the fixing strips 53 through hooks 55, so that the sample frames 54 can be conveniently taken out or put into the box body 1 as required.
The rotary plate 52 is fixedly connected with the rotary shaft 51 through a rotary ring, the inner wall of the rotary ring is prismatic, the rotary shaft 51 is provided with a clamping part matched with the inner wall of the rotary ring, and when the driver 3 is started, the rotary shaft 51 rotates to drive the rotary ring and the rotary plate 52 to rotate. The driver 3 may be a driver 3 such as a motor that drives the rotation shaft 51 to rotate.
As shown in fig. 1, the case 1 is provided with an air inlet 11 and an air outlet 12, and air enters the case 1 through the air inlet 11 and is discharged through the air outlet 12 after being heated by the heating device. Specifically, heating device includes hot-blast air-blower, temperature sensor and pipeline, the bottom of box 1 lateral wall inboard is located to the hot-blast air-blower, the inboard of box 1 back wall is located to temperature sensor, the box 1 lateral wall outside is located to air intake 11, the top of box 1 is located to air outlet 12, hot-blast air-blower passes through the pipe connection with air intake 11, start heating device, the hot-blast air-blower can follow the horizontal direction and send hot-blast to sample frame 54, and driver 3 drives sample frame 54 through rotation axis 51 simultaneously and rotates, the sample of placing on sample frame 54 is heated evenly, temperature sensor can be used to the inside temperature of real-time supervision box 1.
As shown in fig. 1, the box door 2 is provided with an inner window 21, and the box door 2 is provided with a lamp tube, the lamp tube is located beside the camera 22, and when in implementation, the controllable driver 3 is started, the rotating shaft 51 drives the turntable 52 to rotate, so that the designated sample frame 54 stays at the position of the inner window 21 at the front end of the box door 2, and by starting the lamp tube and the camera 22, the aging degree of the sample can be observed and photographed and stored at the same time in a hot oxygen high temperature state, thereby improving the working efficiency and saving the time cost.
As shown in fig. 1, a handle 23 is arranged on the outer side of the box door 2, so that a worker can conveniently open the box door 2 or close the box door 2, and the box door 2 is prevented from being directly touched to cause scalding when the temperature of the box door 2 is too high.
Example two
The automatic measurement system for the thermal oxidation aging life of the polymer material comprises the oven and the machine case 4, as shown in fig. 3, the machine case 4 comprises a control module 42, a calculation module 47, a display screen 41, an acquisition module 43 for acquiring a gallery and a training sample set, an identification module 44 for identifying whether a picture to be processed is a failure picture, a storage module 45 for storing the failure picture and a warning module 46 for warning, the camera 22 and a heating device are respectively connected with the control module 42, the acquisition module 43 is connected with the camera 22, the acquisition module 43, the storage module 45 and the warning module 46 are respectively connected with the identification module 44, the calculation module 47 is connected with the storage module 45, the display screen 41 is connected with the calculation module 47, and the heating device is used for heating and aging a sample and the camera 22 is used for shooting the sample. The driver 3 is used for driving the sample holder 5 to circularly rotate, so that the sample is uniformly aged under the action of the heating device.
The automatic measurement system for the thermal oxidation aging life of the polymer material is characterized in that a control module 42 is used for controlling a heating device to perform thermal oxidation aging on the polymer material sample, a camera 22 in an oven is controlled by the control module 42 to shoot the polymer material sample, a shot picture is input into a recognition module 44 to be recognized by an acquisition module 43, the recognition module 44 stores the recognized failure picture into a storage module 45 and sends out a warning by a warning module 46, the calculation module 47 is used for analyzing the failure picture to calculate the thermal oxidation aging life of the polymer material, and the thermal oxidation aging life of the polymer material is displayed by a display screen 41. According to the invention, the heating device is utilized by the oven to heat and age the polymer material sample, in the sample aging process, the driver 3 drives the rotating shaft 51 to drive the sample rack 5 to rotate, the heating device can uniformly heat a plurality of sample racks 11, so that the uniform thermal oxidation aging of the polymer material is ensured, the test stability is improved, the influence caused by uneven thermal oxidation aging can be reduced when the photographed picture is identified, and the reliability of the automatic measurement of the thermal oxidation aging life of the polymer material is improved.
The heating device comprises a hot air blower, a temperature sensor and a pipeline, wherein the hot air blower is arranged at the bottom of the inner side of the side wall of the box body 1, the temperature sensor is arranged at the inner side of the rear wall of the box body 1, the air inlet 11 is arranged at the outer side of the side wall of the box body 1, the air outlet 12 is arranged at the top of the box body 1, the hot air blower is connected with the air inlet 11 through the pipeline, the heating device is started, the hot air blower can send hot air to the sample frame 54 from the horizontal direction, the driver 3 simultaneously drives the sample frame 54 to rotate through the rotating shaft 51, a sample placed on the sample frame 54 is heated uniformly, the temperature sensor can be used for monitoring the temperature inside the box body 1 in real time, the temperature sensor is connected with the control module 42, the hot air blower is connected with the control module 42, the temperature sensor transmits the acquired temperature data inside the box body 1 to the control module 42, the control module 42 compares the temperature data with the preset temperature, and the hot air blower is controlled, so that a sample sheet is kept at the preset temperature for thermal oxidation aging.
The outside of the box body 1 is provided with a driver 3 connected with a control module 42, an output shaft of the driver 3 is connected with the sample frames 5, the control module 42 controls the driver 3 to be started when the heating device heats the samples, so that the rotating shaft 51 rotates to drive the turntable 52 to rotate, and then the plurality of sample frames 5 are driven to circularly rotate, and the samples on the plurality of sample frames 5 can be uniformly heated.
Example III
The automatic measurement method for the thermal oxidation aging life of the polymer material is applied to the automatic measurement system for the thermal oxidation aging life of the polymer material, as shown in fig. 4, and comprises the following steps:
s1: placing a sample into a sample frame 5, closing a box door 2, presetting the internal temperature of the box body 1, setting the shooting period of a camera 22, starting a heating device to age the sample, and recording the initial time t 0 ；
S2: the sample is shot by the camera 22 according to the shooting period to obtain a gallery, and the shooting time t 'of each shooting is recorded' 0 ；
S3: acquiring a gallery from the camera 22 by using an acquisition module 43, wherein the gallery comprises at least one picture to be processed;
s4: respectively inputting the pictures to be processed into an identification module 44, and identifying the pictures to be processed by using the identification module 44;
s5: judging whether the picture to be processed is a failure picture, if so, inputting the failure picture into the storage module 45 for storage, simultaneously controlling the reminding module 46 to send out a warning, and turning to the step S6; if not, repeating the step S2;
s6: according to the initial time t of a plurality of failure pictures 0 And a shooting time t' 0 Calculating the thermal oxidative aging life t of the polymer material by utilizing an Arrhenius formula u 。
According to the automatic measurement method for the thermal oxidation aging life of the polymer material, the sample is placed in the sample frame 5, the temperature inside the box body 1 is preset after the box door 2 is closed, the shooting period of the camera 22 is set, the heating device is started, the heating device is used for heating and aging the sample, the initial time is recorded, a gallery is obtained according to the pictures shot by the camera 22, the shooting time of each shooting of the camera 22 is recorded, the pictures to be processed acquired from the camera 22 are input into the identification module 44 for identification by the acquisition module 43, whether the pictures to be processed are failure pictures or not can be conveniently judged, the working efficiency is improved, the failure pictures are stored into the storage module 45 after the failure pictures are identified, the reminding module 46 is triggered to send out warning, and the thermal oxidation aging life of the polymer material is calculated by utilizing an Arrhenius formula according to the initial time and the shooting time of the failure pictures, so that the automatic measurement of the thermal oxidation aging life of the polymer material is completed. According to the embodiment, the camera 22 can be utilized to directly shoot a sample picture, frequent box opening and sampling are avoided, the working efficiency is improved, the temperature fluctuation inside the oven caused by frequent box opening is avoided, the testing stability is improved, the influence of the temperature fluctuation on the ageing degree of the material can be reduced when the shot picture is identified, and the reliability of automatic measurement of the thermal oxidation ageing life of the polymer material is improved.
In step S1, a driver 3 is disposed outside the case 1, an output shaft of the driver 3 is connected with a sample holder 5, the sample holder 5 includes a rotation shaft 51, a turntable 52, a fixing strip 53 and a sample frame 54, the rotation shaft 51 is horizontally disposed in the case 1, two ends of the rotation shaft 51 are respectively mounted in the case 1, two ends of the rotation shaft 51 are respectively fixedly connected with the turntable 52, two ends of the fixing strip 53 are respectively connected with the two turntables 52, and the sample frame is detachably connected with the fixing strip 53; an output shaft of the driver 3 is connected to the rotation shaft 51; when the sample holder 4 contains only one sample frame 54, the rotary shaft 51 may be kept stationary so that the sample frame 54 is kept stationary at a position opposite to the camera 22, or the rotary shaft 51 may be driven to rotate by the driver 3 and so that the sample frame 54 is moved to a position opposite to the camera 22 when the camera 22 photographs; when the sample rack 4 comprises two or more sample frames 54, the driver 3 is started to rotate the rotating shaft 51 to drive the turntable 52 to rotate when the heating device heats the samples, so that the plurality of sample frames 54 are driven to rotate circularly, the samples on the plurality of sample racks 5 can be guaranteed to be heated uniformly, the heating device is guaranteed to heat and age the samples on the plurality of sample frames uniformly, and the driver 3 can control the rotating shaft 51 to rotate to enable the appointed sample frame 54 to move to a position opposite to the camera 22 for shooting.
In step S4, before the image to be processed is processed by the identification module 44, as shown in fig. 5, a thermo-oxidative aging image identification model needs to be established, which specifically includes the following steps:
s41: acquiring a first training sample set, wherein the first training sample set comprises a first type of training picture and a second type of training picture, the first type of training picture is a failure picture, and the second type of training picture is a non-failure picture;
s42: and randomly inputting the first training pictures and the second training pictures into the initial thermal oxidation aging picture identification model, and training the characteristic coefficients in the initial thermal oxidation aging picture identification model to obtain the thermal oxidation aging picture identification model.
Further comprises:
s43: acquiring a second training sample set, wherein the second training sample set comprises a third type of test picture and a fourth type of test picture, the third type of test picture is a failure picture, and the fourth type of test picture is a non-failure picture;
s44: and randomly inputting the third type of test pictures and the fourth type of test pictures into the thermal-oxidative aging picture identification model, training the characteristic coefficients in the thermal-oxidative aging picture identification model, and improving the classification accuracy of the thermal-oxidative aging picture identification model.
In step S6, the polymer material has a thermal oxidative aging life t u The specific calculation process of (2) is as follows:
from Arrhenii Wu Sigong, it is known that:
wherein k (t) i ) Represents the rate of thermooxidative aging, T i For the temperature t inside the ith preset tank 1 i Is T i The thermal oxidation aging time in the process is that A represents a factor before, E represents reaction activation energy, and R represents a gas constant;
can be obtained
Then ln t i And (3) withIs in linear relation with t i ＝t′ 0i -t 0i ，
Wherein t is 0i Is T i Initial time of time-lapse pictureBetween, t' 0i Is T i Time of shooting the failure picture;
by aligningFitting to obtain +.>And lnA, and thus can be:
wherein T is u Is the thermal oxidative aging life t of a polymer material u Corresponding thermo-oxidative aging temperature.
Example IV
In the embodiment, an oven is utilized to measure the polyolefin material according to an automatic measuring method of the thermal oxidative aging life of the polymer material, and a sample is named first so that the sample has a unique identifier in a drawing library; placing a sample into the sample frame 54, placing the sample frame 54 into the box body 1, and respectively adjusting the internal temperature of the box body 1 to be T 1 ＝110℃、T 2 ＝115℃、T 3 ＝125℃、T 4 =130 ℃, set the shooting sample period; shooting an initial state of a sample by using a camera 22, saving the initial state as a picture format, automatically naming the picture, wherein a default naming format is 'custom sample name+shooting time of the sample', and the picture storage is divided into folders by the custom sample name, namely 'custom sample name' is the name of a folder for storing pictures shot by different samples; then, the photographed picture is identified by using a thermal oxidation aging identification model, whether the photographed picture is an invalid picture or not is judged, and time conversion is carried out by taking the sample picture time of the invalid picture as an end point, so that the performance aging time of the corresponding sample is t respectively 1 ＝2880h、t 2 ＝2160h、t 3 ＝1140h、t 4 =720 h, thereby obtaining the correspondingAnd->And obtaining an automatic measurement formula of the thermal oxidative aging life of the polyolefin material through linear fitting. In the embodiment, the picture to be processed is identified through the thermo-oxidative aging picture identification model, the picture to be processed in the gallery can be automatically identified and processed, the manual selection of the invalid picture and the movement of the invalid picture into the invalid picture folder are avoided, time and labor are saved, the invalid picture identification efficiency is improved by licking dogs, the manual identification cost is reduced, and the identification accuracy of the invalid picture is improved.
In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (7)
1. The automatic measurement system for the thermal oxidation aging life of the polymer material is characterized by comprising an oven and a case (4), wherein the oven comprises a case body (1) and a case door (2) hinged with the case body (1), a sample rack (5) for placing samples is arranged in the case body (1), and a heating device is arranged in the case body (1); the box door (2) is provided with a camera (22); a driver (3) is arranged outside the box body (1), an output shaft of the driver (3) is connected with the sample frame (5), and the driver (3) drives the sample frame (5) to rotate; the sample rack (5) comprises a rotating shaft (51), a rotating disc (52), fixing strips (53) and sample frames (54), wherein the rotating shaft (51) is horizontally arranged in the box body (1), two ends of the rotating shaft (51) are respectively arranged in the box body (1), the rotating discs (52) are respectively fixedly connected with two ends of the rotating shaft (51), two ends of the fixing strips (53) are respectively connected with the two rotating discs (52), and the sample frames (54) are detachably connected with the fixing strips (53); the sample frames (54) are plate-shaped, and two ends of the sample frames (54) are respectively connected with two ends of the fixing strip (53) through hooks (55); an output shaft of the driver (3) is connected with the rotating shaft (51), and the driver (3) drives the rotating shaft (51) to rotate so as to drive the sample rack (5) to rotate; the case (4) comprises a control module (42), a calculation module (47), a display screen (41), an acquisition module (43) for acquiring a gallery and a training sample set, an identification module (44) for identifying whether a picture to be processed is a failure picture, a storage module (45) for storing the failure picture and a reminding module (46) for warning, wherein the camera (22) and the heating device are respectively connected with the control module (42), the acquisition module (43) is connected with the camera (22), the acquisition module (43), the storage module (45) and the reminding module (46) are respectively connected with the identification module (44), the calculation module (47) is connected with the storage module (45), and the display screen (41) is connected with the calculation module (47).
2. The system for automatic measurement of the thermal oxidative aging life of a polymeric material according to claim 1, wherein said heating means comprises a hot air blower provided at the bottom of the inside of the side wall of said tank (1).
3. The automatic measurement system for the thermal oxidative aging life of a polymer material according to claim 1, wherein the box (1) is provided with an air inlet (11) and an air outlet (12), and air enters the box (1) from the air inlet (11) and is discharged from the air outlet (12) after being heated by the heating device.
4. An automatic measurement method for the thermal oxidation aging life of a polymer material, which is applied to the automatic measurement system for the thermal oxidation aging life of the polymer material according to any one of claims 1 to 3, and is characterized by comprising the following steps:
s1: placing a sample into a sample frame (5), closing a box door (2), presetting the internal temperature of a box body (1), setting the shooting period of a camera (22), starting a heating device, ageing the sample, and recording the initial time；
S2: shooting a sample by using a camera (22) according to a shooting period to obtain a gallery, and recording shooting time of each shooting；
S3: obtaining a gallery from a camera (22) by using an obtaining module (43), wherein the gallery comprises at least one picture to be processed;
s4: respectively inputting the pictures to be processed into an identification module (44), and identifying the pictures to be processed by utilizing the identification module (44);
s5: judging whether the picture to be processed is a failure picture, if so, inputting the failure picture into a storage module (45) for storage, controlling a reminding module (46) to send out a warning, and turning to the step S6; if not, repeating the step S2;
s6: according to the initial time of a plurality of failure picturesAnd shooting time->Calculating the polymer by utilizing an Arrhenius formulaMaterial thermo-oxidative aging life->。
5. The method for automatically measuring the thermal oxidative aging life of a polymer material according to claim 4, wherein in step S4, a thermal oxidative aging picture identification model is established before the picture to be processed is processed by the identification module (44), and the specific steps are as follows:
s41: acquiring a first training sample set, wherein the first training sample set comprises a first type of training picture and a second type of training picture, the first type of training picture is a failure picture, and the second type of training picture is a non-failure picture;
s42: and inputting the first training pictures and the second training pictures into an initial thermal-oxidative aging picture identification model randomly, and training characteristic coefficients in the initial thermal-oxidative aging picture identification model to obtain a thermal-oxidative aging picture identification model.
6. The method for automatically measuring the thermal oxidative aging life of a polymeric material according to claim 5, further comprising:
s43: acquiring a second training sample set, wherein the second training sample set comprises a third type of test picture and a fourth type of test picture, the third type of test picture is a failure picture, and the fourth type of test picture is a non-failure picture;
s44: and randomly inputting the third type of test pictures and the fourth type of test pictures into the thermal-oxidative aging picture identification model, training the characteristic coefficients in the thermal-oxidative aging picture identification model, and improving the classification accuracy of the thermal-oxidative aging picture identification model.
7. The method for automatic measurement of thermal oxidative aging life of a polymer material according to claim 4, wherein in step S6, thermal oxidative aging life of a polymer material is measuredThe specific calculation process of (2) is as follows:
from Arrhenii Wu Sigong, it is known that:
in the method, in the process of the invention,indicates the rate of thermo-oxidative aging,/->Is->The temperature inside the preset box body (1), is->Is->Time of thermo-oxidative aging->The expression refers to a factor before finger, E is reaction activation energy, and R is a gas constant;
can be obtained
ThenAnd->Is in a linear relationship with ∈>，
In the method, in the process of the invention,is->Time of initial time of failure picture, +.>Is->Time of shooting the failure picture;
by aligning、/>、/>、……/>Fitting to obtain +.>Andand then can be:
in the method, in the process of the invention,thermal oxidative aging Life for Polymer materials>Corresponding thermo-oxidative aging temperature.
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