CN114062232A - Oven, and automatic measuring system and method for thermal-oxidative aging life of polymer material - Google Patents
Oven, and automatic measuring system and method for thermal-oxidative aging life of polymer material Download PDFInfo
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Abstract
The invention relates to the technical field of aging life test of polymer materials, in particular to an oven, and an automatic measuring system and method for the thermo-oxidative aging life of a polymer material.
Description
Technical Field
The invention relates to the technical field of aging life test of polymer materials, 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 can have chalking characteristics after being aged for a long time at high temperature, and the aging degree of the material can be judged directly through the apparent chalking degree of the material. The existing oven device cannot directly observe the material surface pulverization condition under the high-temperature state of an oven in the actual polymer material thermo-oxidative aging process, frequent sampling can cause oven temperature fluctuation, deviation with the actual oven temperature occurs, and meanwhile, the working efficiency and the service performance 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 is externally provided with a square glass window; a rotating shaft vertically disposed inside the case; the multi-layer rotating disc is detachably connected with the rotating shaft respectively, and the plurality of fixing rings are detachably connected with the rotating disc; the lower end face of the fixing rings is provided with cylindrical bulges corresponding to the round holes in the rotary disc. This scheme can have placed a plurality of flourishing appearance wares simultaneously, shortens test cycle, but when being used for carrying out thermal oxygen ageing to polymer material, the surface pulverization condition of unable direct observation sample need frequently unpack the sample, leads to the deviation to appear in the inside temperature of oven, reduces oven performance and work efficiency.
In addition, when the thermal-oxidative-aging picture is few, the thermal-oxidative-aging degree identification is usually performed on the picture manually by a human. However, with the increase of the testing workload, hundreds of pictures are generally required to be identified and classified, a manual processing mode becomes too unrealistic, manpower is consumed, and the accuracy of the measurement of the thermal-oxidative aging life of the subsequent polymer material cannot be guaranteed. Chinese patent CN111562241A discloses a method for detecting aging of polymer material and analyzing the process, aiming at the specific functional group generated by the polymer in the aging process, a specific fluorescent probe molecule is selected to perform targeted post-dyeing treatment on the functional group, so that the aging point of the polymer material is marked by fluorescence to display fluorescence signal change due to the change of the functional group, multi-dimensional visual monitoring on the aging point is realized by collecting the fluorescence signal, and aging reaction rate constants under different dimensions are 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 an oven and a polymer material.
In order to solve the technical problems, the invention adopts the technical scheme that:
providing an oven, which comprises an oven body and an oven door hinged with the oven body, wherein a sample rack for placing a sample 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, 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 and invalid or not is judged according to the shot sample picture, the problem that the temperature in the oven is deviated due to frequent opening of the oven is avoided, and the test stability and the working efficiency are improved. When the device is used for carrying out thermo-oxidative aging on the polymer material, the heating device carries out thermo-oxidative aging on the polymer material, the camera can directly shoot pictures of the polymer material, the aging degree of the polymer material can be conveniently judged according to the pulverization condition of the surface of the material, frequent unpacking and sampling are avoided, the working efficiency is improved, temperature fluctuation in an oven caused by frequent unpacking is avoided, and the stability of testing and the reliability of a testing result are improved.
Further, a driver is arranged on the outer side of the box body, an output shaft of the driver is connected with the sample rack, and the driver drives the sample rack to rotate.
Furthermore, the sample rack comprises a rotating shaft, rotating discs, fixing strips and a sample frame, the rotating shaft is horizontally arranged in the box body, two ends of the rotating shaft are respectively arranged in the box body, the two ends of the rotating shaft are respectively and fixedly connected with the rotating discs, two ends of the fixing strips are respectively connected with the two rotating discs, and the sample frame is 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 supplying 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.
Furthermore, the box body is provided with an air inlet and an air outlet, air enters the box body from the air inlet, and is heated by the heating device and then is discharged from the air outlet.
The invention also provides an automatic measuring system for the thermo-oxidative aging life of the polymer material, which comprises the oven and the case, wherein the case comprises a control module, a computing module, a display screen, an acquisition module for acquiring the gallery and the training sample set, an identification module for identifying whether the picture to be processed is a failure picture, a storage module for storing the failure picture and a reminding 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 acquisition module, the storage module and the reminding module are respectively connected with the identification module, the computing module is connected with the storage module, and the display screen is connected with the computing module.
The automatic measuring system for the thermo-oxidative aging life of the polymer material controls the starting of the heating device through the control module, carries out thermo-oxidative aging on a polymer material sample, utilizes the control module to control the camera in the oven to shoot the polymer material sample, inputs the shot picture into the identification module through the acquisition module to be identified, stores the identified failure picture into the storage module through the identification module, utilizes the reminding module to send out a warning, analyzes the failure picture through the calculation module, calculates the thermo-oxidative aging life of the polymer material, and displays the life through the display screen. According to the invention, the camera arranged in the box body can be utilized to directly shoot the sample picture, so that frequent unpacking and sampling are avoided, the working efficiency is improved, the temperature fluctuation in the oven caused by frequent unpacking is avoided, the improvement of the test stability is facilitated, the influence of the temperature fluctuation on the aging degree of the material can be reduced when the shot picture is identified, and the reliability of the automatic measurement of the thermo-oxidative aging life of the polymer material is improved.
The invention also provides a method for automatically measuring the thermo-oxidative aging life of the polymer material, which is applied to the system for automatically measuring the thermo-oxidative aging life of the polymer material and comprises the following steps:
s1: putting a sample into a sample rack, closing a box door, presetting the internal temperature of the box body, setting the shooting period of a camera, starting a heating device to age the sample, and recording the initial time t0；
S2: shooting the sample according to a shooting period by using a camera to obtain a map library, and recording shooting time t 'of each shooting'0；
S3: acquiring a gallery from a camera by using an acquisition 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 utilizing 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 pictures0And shooting time t'0Calculating the thermo-oxidative aging life t of the polymer material by using an Arrhenius formulau。
The method for automatically measuring the thermo-oxidative aging life of the polymer material comprises the steps of putting a sample into a sample rack, closing a box door, presetting the temperature in the box body, setting the shooting period of the camera, starting the heating device, recording the initial time while the heating device heats and ages the sample, obtaining a picture library according to pictures shot by the camera, simultaneously recording the shooting time of each shooting of the camera, inputting the pictures to be processed obtained from the camera into an identification module by using an obtaining module for identification, can conveniently judge whether the picture to be processed is a failure picture or not, improves the working efficiency, and after the failure picture is identified, and storing the failure picture in a storage module, triggering a reminding module to send out a warning, calculating the thermo-oxidative aging life of the polymer material by using an Arrhenius formula according to the initial time and the shooting time of the failure picture, and finishing the automatic measurement of the thermo-oxidative aging life of the polymer material. The invention can utilize the camera to directly shoot the sample picture, avoids frequent unpacking and sampling, improves the working efficiency, avoids the temperature fluctuation in the oven caused by frequent unpacking, is beneficial to improving the test stability, can reduce the influence of the temperature fluctuation on the aging degree of the material when identifying the shot picture, and improves the reliability of the automatic measurement of the thermo-oxidative aging life of the polymer material.
Preferably, in step S4, before the image to be processed is processed by the recognition module, a thermal oxidation aging image recognition model needs to be established, and the specific steps are as follows:
s41: acquiring a first training sample set, wherein the first training sample set comprises a first class of training pictures and a second class of training pictures, the first class of training pictures are failure pictures, and the second class of training pictures are non-failure pictures;
s42: and randomly inputting the first class of training pictures and the second class of training pictures into an initial thermal oxidation aging picture recognition model, and training the characteristic coefficients in the initial thermal oxidation aging picture recognition model to obtain the thermal oxidation aging picture recognition model.
Preferably, the method further comprises the following steps:
s43: acquiring a second training sample set, wherein the second training sample set comprises a third type of test pictures and a fourth type of test pictures, the third type of test pictures are failure pictures, and the fourth type of test pictures are non-failure pictures;
s44: and randomly inputting the third type of test picture and the fourth type of test picture into the thermal oxidation aging picture recognition model, training the characteristic coefficients in the thermal oxidation aging picture recognition model, and improving the classification accuracy of the thermal oxidation aging picture recognition model.
Preferably, in step S6, the thermo-oxidative aging life t of the polymer materialuThe specific calculation process of (2) is as follows: according to the Arrhenius formula, the following formula is obtained:
in the formula, k (t)i) Indicates the rate of thermo-oxidative aging, TiFor the ith predetermined temperature inside the tank, tiIs TiThe thermal-oxidative aging time is as follows, A represents a pre-factor, E is reaction activation energy, and R is a gas constant;
can obtain
Then ln tiAnd
is in a linear relationship with each other, and ti＝t′0i-t0i，
In the formula, t0iIs TiInitial time of time spent picture, t'0iIs TiThe shooting time of the time-lapse picture;
by pairs
Fitting is carried out to obtain
And lnA, which in turn gives:
in the formula, TuThermo-oxidative aging life t for polymer materialsuCorresponding thermo-oxidative aging temperature.
Compared with the background technology, the automatic measuring system and method for the thermo-oxidative aging life of the oven and the polymer material have the following beneficial effects:
the aging degree of the sample can be judged by shooting a sample picture, so that frequent unpacking and sampling are avoided, and the working efficiency is improved; the problem of deviation of the internal temperature of the oven caused by frequent opening is avoided, and the stability of the test is improved; the sample rack can be driven by the driver to rotate circularly, so that the sample on the sample rack is heated uniformly; whether the sample fails or not is judged by using the recognition model according to the shot picture, so that the test process is simplified, and the test efficiency is improved; the influence of temperature fluctuation on the aging degree of the material can be reduced when the shot picture is identified, and the reliability of the automatic measurement of the thermo-oxidative aging life of the polymer material is improved.
Drawings
FIG. 1 is a schematic structural diagram of an oven in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a sample holder according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of an automatic measuring system for thermo-oxidative aging life of polymer material according to a second embodiment of the present invention;
FIG. 4 is a flow chart of an automatic measurement method for thermo-oxidative aging life of polymer material according to a third embodiment of the present invention;
FIG. 5 is a flowchart of establishing a thermal-oxidative aging recognition model according to a third embodiment of the present invention;
in the drawings: 1-a box body; 11-an air inlet; 12-an air outlet; 2-a box door; 21-inner window; 22-a camera; 23-a handle; 3-a driver; 4-a case; 41-display screen; 42-a control module; 43-an acquisition module; 44-an identification module; 45-a storage module; 46-a reminder module; 47-a calculation module; 5-a sample holder; 51-a rotation axis; 52-a turntable; 53-fixation bar; 54-sample frame; 55-hook.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation 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 intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example one
As shown in fig. 1, an oven comprises an oven body 1 and an oven door 2 hinged with the oven body 1, wherein a sample rack 5 for placing samples is arranged in the oven body 1, and a heating device is arranged in the oven 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 usable camera 22 shoots the sample, judges whether ageing inefficacy of sample according to the sample picture of shooing, avoids frequently unpacking the problem that the deviation appears in the inside temperature of oven that leads to, is favorable to improving test stability and work efficiency. When the device is used for carrying out thermo-oxidative aging on the polymer material, the heating device carries out thermo-oxidative aging on the polymer material, the camera 22 can directly shoot pictures of the polymer material, the aging degree of the polymer material can be conveniently judged according to the pulverization condition of the surface of the material, frequent sampling is avoided, the working efficiency is improved, temperature fluctuation in an oven caused by frequent opening of the oven is avoided, and the stability of testing and the reliability of testing results are improved.
As shown in fig. 1, a driver 3 is arranged outside the box 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 rotating shaft 51, a rotating disc 52, a fixing strip 53 and a sample frame 54, the rotating shaft 51 is horizontally disposed in the box 1, two ends of the rotating shaft 51 are respectively installed in the box 1, two ends of the rotating shaft 51 are respectively and fixedly connected with the rotating disc 52, two ends of the fixing strip 53 are respectively connected to the two rotating discs 52, and the sample frame is detachably connected with the fixing strip 53; the output shaft and the rotation axis 51 of driver 3 are connected, and when heating device heated the sample, start driver 3, make rotation axis 51 rotate, drive carousel 52 and rotate, and then drive a plurality of sample frames 54 circulation and rotate, can guarantee that the sample on a plurality of sample frame 5 is heated evenly.
Specifically, the rotating disc 52 is circular, two ends of the plurality of fixing strips 53 are respectively connected to the circumferences of the two rotating discs 52, the plurality of 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 the hooks 55, so that the sample frames 54 can be conveniently taken out or put into the box body 1 as required.
The rotating disc 52 is fixedly connected with the rotating shaft 51 through a rotating ring, the inner wall of the rotating ring is prismatic, the rotating shaft 51 is provided with a clamping part matched with the inner wall of the rotating ring, and when the driver 3 is started, the rotating shaft 51 rotates to drive the rotating ring and the rotating disc 52 to rotate. It should be noted that the driver 3 may be a motor or the like that can drive the rotating shaft 51 to rotate.
As shown in fig. 1, the box 1 is provided with an air inlet 11 and an air outlet 12, and air enters the box 1 through the air inlet 11, is heated by the heating device, and is discharged through the air outlet 12. Specifically, heating device includes hot air blower, temperature sensor and pipeline, hot air blower locates the inboard bottom of box 1 lateral wall, temperature sensor locates the inboard of box 1 back wall, the lateral wall outside of box 1 is located to air intake 11, the top of box 1 is located to air outlet 12, hot air blower passes through the pipe connection with air intake 11, start heating device, hot 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, when in use, the controllable driver 3 is started, the rotating shaft 51 drives the rotating disc 52 to rotate, so that the specified sample frame 54 is stopped 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 effectively observed and the sample can be photographed and stored at the same time under the hot oxygen high temperature state, thereby improving the working efficiency and saving the time cost.
As shown in fig. 1, the handle 23 is arranged on the outer side of the box door 2, so that the box door 2 can be opened or closed by a worker, and the situation that the box door 2 is directly touched to cause scald when the temperature of the box door 2 is too high is prevented.
Example two
An automatic measuring system for the thermo-oxidative aging life of polymer materials comprises the oven and the cabinet 4, as shown in fig. 3, the case 4 includes a control module 42, a computing module 47, a display screen 41, an obtaining module 43 for obtaining a gallery and a training sample set, an identifying module 44 for identifying whether a picture to be processed is a failure picture, a storing module 45 for storing the failure picture, and a reminding module 46 for warning, 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, the display screen 41 is connected with the calculation module 47, the heating device is used for heating and aging the sample, and the camera 22 is used for shooting the sample. The driver 3 is used for driving the sample holder 5 to rotate circularly, so that the sample is aged uniformly under the action of the heating device.
The system for automatically measuring the thermo-oxidative aging life of the polymer material controls the starting of the heating device through the control module 42, performs thermo-oxidative aging on a polymer material sample, controls the camera 22 in the oven to shoot the polymer material sample through the control module 42, inputs the shot picture into the identification module 44 through the acquisition module 43 for identification, stores the identified failure picture into the storage module 45 through the identification module 44, sends out an alarm through the reminding module 46, analyzes the failure picture through the calculation module 47, calculates the thermo-oxidative aging life of the polymer material, and displays the failure picture through the display screen 41. According to the invention, the drying oven can utilize the heating device 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 thermo-oxidative aging of the polymer material is ensured, the test stability is favorably improved, the influence caused by nonuniform thermo-oxidative aging can be reduced when a shot picture is identified, and the reliability of the automatic measurement of the thermo-oxidative aging life of the polymer material is improved.
The heating device comprises a hot air blower, a temperature sensor and a pipeline, 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 uniformly heated, 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 collected temperature data inside the box body 1 to the control module 42, and the control module 42 compares the temperature data with the preset temperature, and controlling a hot air blower to keep the sample wafer at a preset temperature for thermo-oxidative aging.
The outside of box 1 is provided with driver 3 of being connected with control module 42, and the output shaft of driver 3 is connected with sample frame 5, and when heating device heated the sample, control module 42 control started driver 3 made rotation axis 51 rotate, drives carousel 52 and rotates, and then drives a plurality of sample frame 5 circulative rotation, can guarantee that the sample on a plurality of sample frame 5 is heated evenly.
EXAMPLE III
An automatic measuring method for the thermal-oxidative aging life of a polymer material is applied to the automatic measuring system for the thermal-oxidative aging life of the polymer material, as shown in fig. 4, and comprises the following steps:
s1: putting a sample into a sample rack 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 to age the sample, and recording the initial time t0；
S2: shooting the sample by the camera 22 according to the shooting period to obtain a map library, and recording the shooting time t 'of each shooting'0；
S3: acquiring a gallery from the camera 22 by using the acquisition module 43, wherein the gallery comprises at least one picture to be processed;
s4: respectively inputting the pictures to be processed into the 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 the storage module 45 for storage, controlling the reminding module 46 to give 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 pictures0And shooting time t'0Calculating the thermal oxygen aging of the polymer material by using an Arrhenius formulaChange life tu。
The method for automatically measuring the thermo-oxidative aging life of the polymer material comprises the steps of putting a sample into a sample rack 5, presetting the temperature inside a box body 1 after closing a box door 2, setting the shooting period of a camera 22, starting a heating device, heating and aging the sample by the heating device, simultaneously recording initial time, obtaining a picture library according to pictures shot by the camera 22, simultaneously recording the shooting time of each shooting of the camera 22, inputting the picture to be processed obtained from the camera 22 into an identification module 44 by an obtaining module 43 for identification, conveniently judging whether the picture to be processed is a failure picture or not, improving the working efficiency, storing the failure picture into a storage module 45 and triggering a reminding module 46 to give a warning after identifying the failure picture, and calculating the thermo-oxidative aging life of the polymer material by utilizing an Arrhenius formula according to the initial time and the shooting time of the failure picture, and completing the automatic measurement of the thermo-oxidative aging life of the polymer material. The embodiment can utilize the camera 22 to directly shoot the sample picture, avoids frequent unpacking and sampling, improves the working efficiency, avoids the fluctuation of the temperature inside the oven caused by frequent unpacking, is favorable for improving the test stability, can reduce the influence of the temperature fluctuation on the aging degree of the material when identifying the shot picture, and improves the reliability of the automatic measurement of the thermal oxidation aging life of the polymer material.
In step S1, the driver 3 is disposed outside the box 1, the output shaft of the driver 3 is connected to the sample holder 5, the sample holder 5 includes a rotating shaft 51, rotating discs 52, fixing strips 53 and sample frames 54, the rotating shaft 51 is horizontally disposed in the box 1, two ends of the rotating shaft 51 are respectively installed in the box 1, two ends of the rotating shaft 51 are respectively and fixedly connected to the rotating discs 52, two ends of the fixing strips 53 are respectively connected to the two rotating discs 52, and the sample frames are detachably connected to the fixing strips 53; the output shaft of the driver 3 is connected to the rotary shaft 51; when the sample holder 4 only contains one sample frame 54, the rotating shaft 51 can be kept still so that the sample frame 54 is kept still at a position opposite to the camera 22, or the rotating shaft 51 can be driven by the driver 3 to rotate so that the sample frame 54 moves to a position opposite to the camera 22 when the camera 22 takes a picture; when sample frame 4 contains two or more sample frames 54, when heating device heats the sample, start driver 3, make rotation axis 51 rotate, drive carousel 52 and rotate, and then drive a plurality of sample frames 54 circulation and rotate, can guarantee that the sample on a plurality of sample frames 5 is heated evenly, guarantee that heating device carries out the even heating ageing to the sample on a plurality of sample frames, and can be by the rotation of driver 3 control rotation axis 51, make appointed sample frame 54 move to the position relative with camera 22 and shoot.
In step S4, before the recognition module 44 is used to process the picture to be processed, as shown in fig. 5, a thermal oxidation aging picture recognition 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 class of training pictures and a second class of training pictures, the first class of training pictures are failure pictures, and the second class of training pictures are non-failure pictures;
s42: and randomly inputting the first class of training pictures and the second class of training pictures into the initial thermal oxidation aging picture recognition model, and training the characteristic coefficients in the initial thermal oxidation aging picture recognition model to obtain the thermal oxidation aging picture recognition model.
Further comprising:
s43: acquiring a second training sample set, wherein the second training sample set comprises a third type of test pictures and a fourth type of test pictures, the third type of test pictures are failure pictures, and the fourth type of test pictures are non-failure pictures;
s44: and randomly inputting the third type of test picture and the fourth type of test picture into the thermal oxidation aging picture recognition model, training the characteristic coefficients in the thermal oxidation aging picture recognition model, and improving the classification accuracy of the thermal oxidation aging picture recognition model.
In step S6, the polymer material thermal oxidative aging life tuThe specific calculation process of (2) is as follows:
according to the Arrhenius formula, the following formula is obtained:
in the formula, k (t)i) Indicates the rate of thermo-oxidative aging, TiFor the ith predetermined temperature, t, inside the tank 1iIs TiThe thermal-oxidative aging time is as follows, A represents a pre-factor, E is reaction activation energy, and R is a gas constant;
can obtain
Then ln tiAnd
is in a linear relationship with each other, and ti＝t′0i-t0i，
In the formula, t0iIs TiInitial time of time spent picture, t'0iIs TiThe shooting time of the time-lapse picture;
by pairs
Fitting is carried out to obtain
And lnA, which in turn gives:
in the formula, TuThermo-oxidative aging life t for polymer materialsuCorresponding thermo-oxidative aging temperature.
Example four
In the embodiment, a polyolefin material is measured by using an oven according to a polymer material thermo-oxidative aging life automatic measurement method, and a sample is named first, so that the sample has a unique identifier in a gallery; putting the sample into the sample frame 54, putting the sample frame 54 into the box body 1, and respectively adjusting the internal temperature of the box body 1 to be T1＝110℃、T2＝115℃、T3＝125℃、T4Setting a shooting sample period at 130 ℃; the initial state of the sample is shot by using the camera 22, the initial state is stored as a picture format, the picture is automatically named, the default naming format is ' user-defined sample name + time for shooting the sample ', the picture storage is divided into folders by the user-defined sample name, namely, the user-defined sample name ' is used as the name of the folder for storing different sample shooting pictures; then, the thermal oxidation aging identification model is used for identifying the shot picture, judging whether the shot picture is a failure picture or not, and carrying out time conversion by taking the sample picture time of the failure picture as an end point to obtain the performance aging time of the corresponding sample which is t respectively1＝2880h、t2＝2160h、t3＝1140h、t4720h, then the corresponding
And
and then linear fitting is carried out to obtain an automatic measuring formula for the thermo-oxidative aging life of the polyolefin material. In the embodiment, the pictures to be processed are identified through the thermal oxidation aging picture identification model, the pictures to be processed in the picture library can be automatically identified and processed, the condition that the failure pictures are manually selected and moved into the failure picture folder is avoided, time and labor are saved, the efficiency of identifying the failure pictures is improved by licking dogs, the manual identification cost is reduced, and the identification accuracy of the failure pictures is improved.
In the detailed description of the embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An oven comprises an oven body (1) and an oven door (2) hinged with the oven body (1), wherein a sample rack (5) for placing samples is arranged in the oven body (1), and the oven is characterized in that a heating device is arranged in the oven body (1); the box door (2) is provided with a camera (22).
2. Oven according to claim 1, characterized in that a driver (3) is arranged outside the box (1), the output shaft of the driver (3) is connected with the sample holder (5), and the driver (3) drives the sample holder (5) to rotate.
3. The oven according to claim 2, characterized in that the sample holder (5) comprises a rotating shaft (51), rotating discs (52), fixing strips (53) and a sample frame (54), wherein the rotating shaft (51) is horizontally arranged in the box body (1), two ends of the rotating shaft (51) are respectively arranged on the box body (1), two ends of the rotating shaft (51) are respectively and fixedly connected with the rotating discs (52), two ends of the fixing strips (53) are respectively connected with the two rotating discs (52), and the sample frame (54) is detachably connected with the fixing strips (53); the 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 holder (5) to rotate.
4. Oven according to claim 3, characterized in that the heating means comprise a hot air blower arranged at the bottom inside the side wall of the cabinet (1).
5. Oven according to claim 1, characterized in that the housing (1) is provided with an air inlet (11) and an air outlet (12), air entering the housing (1) from the air inlet (11) being heated by the heating means and being discharged from the air outlet (12).
6. An automatic measuring system for the thermo-oxidative aging life of a polymer material, which is characterized by comprising an oven and a cabinet (4) according to any one of claims 1 to 5, wherein the cabinet (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, 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 reminding module (46) are respectively connected with the identification module (44), and the calculation module (47) is connected with the storage module (45), the display screen (41) is connected with the calculation module (47).
7. An automatic measuring method for the thermal-oxidative aging life of the polymer material, which is applied to the automatic measuring system for the thermal-oxidative aging life of the polymer material as claimed in claim 6, and is characterized by comprising the following steps:
s1: putting a sample into a sample rack (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 t0；
S2: the sample is shot according to the shooting period by a camera (22) to obtain a map library, and the shooting time t 'of each shooting is recorded'0；
S3: acquiring a gallery from a 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 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 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 pictures0And shooting time t'0Calculating the thermo-oxidative aging life t of the polymer material by using an Arrhenius formulau。
8. The method for automatically measuring the thermo-oxidative aging life of the polymer material according to claim 7, wherein in step S4, before the picture to be processed is processed by the recognition module (44), a thermo-oxidative aging picture recognition model is established, and the method comprises the following specific steps:
s41: acquiring a first training sample set, wherein the first training sample set comprises a first class of training pictures and a second class of training pictures, the first class of training pictures are failure pictures, and the second class of training pictures are non-failure pictures;
s42: and randomly inputting the first class of training pictures and the second class of training pictures into an initial thermal oxidation aging picture recognition model, and training the characteristic coefficients in the initial thermal oxidation aging picture recognition model to obtain the thermal oxidation aging picture recognition model.
9. The method for automatically measuring the thermo-oxidative aging life of a polymer material according to claim 8, further comprising:
s43: acquiring a second training sample set, wherein the second training sample set comprises a third type of test pictures and a fourth type of test pictures, the third type of test pictures are failure pictures, and the fourth type of test pictures are non-failure pictures;
s44: and randomly inputting the third type of test picture and the fourth type of test picture into the thermal oxidation aging picture recognition model, training the characteristic coefficients in the thermal oxidation aging picture recognition model, and improving the classification accuracy of the thermal oxidation aging picture recognition model.
10. The method for automatically measuring the thermo-oxidative aging life of a polymer material according to claim 7, wherein in step S6, the thermo-oxidative aging life of the polymer materialtuThe specific calculation process of (2) is as follows:
according to the Arrhenius formula, the following formula is obtained:
in the formula, k (t)i) Indicates the rate of thermo-oxidative aging, TiFor the ith preset temperature, t, inside the box body (1)iIs TiThe thermal-oxidative aging time is as follows, A represents a pre-factor, E is reaction activation energy, and R is a gas constant;
can obtain
LntiAnd
is in a linear relationship with each other, and ti＝t′0i-t0i，
In the formula, t0iIs TiInitial time of time spent picture, t'0iIs TiThe shooting time of the time-lapse picture;
by pairs
Fitting is carried out to obtain
And lnA, which in turn gives:
in the formula, TuThermo-oxidative aging life t for polymer materialsuCorresponding thermo-oxidative aging temperature.
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