Thermal oxidation experiment device for polymer material

Abstract

The utility model relates to the technical field of polymer material aging experiments, and particularly discloses a thermal oxidation experiment device for polymer materials, which comprises a sample box, a thermal oxidation experiment device and a thermal oxidation experiment device, the sample frame is arranged in the box body, and the sample frame is configured to rotate around the height direction of the box body; the air supply assembly comprises a first air supply port and a second air supply port which are formed in the box cover, the first air supply port is used for inputting air or nitrogen into the box body, and the second air supply port is used for inputting oxygen into the box body; the heating assembly comprises a heater and a temperature measuring element; the circulating fan is mounted in the box body, and the circulating fan is used for enabling air in the box body to circularly flow; and the control unit is configured to control the heating temperature of the heater and the output air speed of the circulating fan according to the temperature data detected by the temperature measuring element. The device provided by the utility model can dynamically adjust the stability of the experimental heating temperature so as to meet different experimental requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of polymer material aging experiments, in particular to a thermal oxidation experimental device for polymer materials. Background Art

[0002] During use, polymer materials inevitably degrade through a slow thermal oxidation reaction with oxygen in the air under certain temperature conditions. This degradation is called thermal oxidation. The thermal oxidation process of polymer materials is a long process. In order to more quickly understand the service life of polymer materials, it is necessary to quickly evaluate the thermal oxidation aging behavior of polymer materials in a laboratory environment by strengthening aging conditions (such as adopting higher temperatures, higher oxygen concentrations, and higher gas pressures). Current experimental equipment has low heating temperature stability during experiments and cannot adjust the heating temperature stability, making it difficult to meet different experimental requirements. Utility Model Content

[0003] The utility model aims to provide a thermal oxidation experimental device for polymer materials, which can dynamically adjust the experimental heating temperature stability to meet different experimental requirements.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a thermal oxidation experimental device for polymer materials, comprising:

[0005] The sample box comprises a box body and a box cover provided on the box body, wherein the box cover is used to open or close the box body;

[0006] a sample rack, disposed in the box, and configured to rotate around the height direction of the box;

[0007] An air supply assembly includes a first air supply port and a second air supply port installed on the box cover, wherein the first air supply port is used to input air or nitrogen into the box, and the second air supply port is used to input oxygen into the box;

[0008] A heating assembly, comprising a heater and a temperature measuring element, wherein the heater is mounted around the outer periphery of the box, and a plurality of temperature measuring elements are provided and used to detect the temperature at different positions in the box;

[0009] a circulation fan installed in the box, the circulation fan being used to circulate the air in the box; and

[0010] The control unit is configured to control the heating temperature of the heater and the output wind speed of the circulation fan according to the temperature data detected by the temperature measuring element.

[0011] In one embodiment, the box body adopts a sandwich structure to form an oil bath cavity, and the outer wall of the box body is provided with an oil inlet and an oil outlet respectively connected to the oil bath cavity, and the oil inlet is located above the oil outlet.

[0012] In one embodiment, a heat insulation cover is further included, and the heat insulation cover is covered on the outside of the heater.

[0013] In one embodiment, the sample rack includes a motor, a rotating shaft driven by the motor, and a tray installed on the rotating shaft along the height direction of the box body. The motor is installed on the box cover, the rotating shaft and the tray are both arranged in the box body, the tray is used to place samples, and the motor is electrically connected to the control unit.

[0014] In one embodiment, baffles are provided at intervals between the air outlets of the circulation fan, and the baffles are installed on the inner wall of the box body. The baffles are used to prevent the airflow blown out by the circulation fan from directly heading towards the sample.

[0015] In one embodiment, the heater is an annular heating ring or a heating rod, and a plurality of the heaters are provided.

[0016] In one embodiment, there are nine temperature measuring elements, four of which are arranged on the four upper sides of the interior of the box, one temperature measuring element is arranged in the middle of the box, and four of which are arranged on the four lower sides of the interior of the box.

[0017] In one embodiment, the air supply assembly further includes a pressure regulating valve, a pressure gauge and an oxygen concentration tester installed on the box cover, the pressure gauge is used to detect the air pressure in the box, and the oxygen concentration tester is used to detect the oxygen concentration in the box, and the pressure gauge and the oxygen concentration tester are electrically connected to the control unit respectively.

[0018] In one embodiment, the apparatus further comprises a stand and casters installed at the bottom of the stand, wherein the sample box is arranged in the stand.

[0019] In one embodiment, a lifting module is further included. The lifting module is arranged below the sample box and is used to move the sample box along the height direction of the box body.

[0020] The utility model provides a thermal oxidation experimental device for polymer materials. Compared with the prior art, the utility model has the following advantages:

[0021] The control unit is configured to control the heating temperature of the heater and the output wind speed of the circulating fan according to the temperature data detected by the temperature measuring element. By controlling the output wind speed of the circulating fan, the stability of the experimental heating temperature can be dynamically adjusted to meet different experimental requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the three-dimensional structure of a thermal oxidation experimental device for polymer materials provided in an embodiment of the present invention.

[0023] Figure 2 This is an enlarged schematic diagram of the spatial distribution of temperature measuring elements inside the box of the thermal oxidation experimental device for polymer materials provided by an embodiment of the present invention.

[0024] In the figure: 1. Sample box; 11. Box body; 12. Box cover; 13. Oil bath chamber; 14. Oil inlet; 15. Oil outlet; 2. Sample rack; 21. Motor; 22. Rotating shaft; 23. Tray; 3. Air supply assembly; 31. First air supply port; 32. Second air supply port; 33. Pressure regulating valve; 34. Pressure gauge; 35. Oxygen concentration tester; 4. Heating assembly; 41. Heater; 42. Temperature measuring element; 5. Circulating fan; 51. Baffle; 6. Control unit; 7. Heat shield; 8. Stand; 81. Casters; 9. Lifting module; z, height direction of the box. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0026] It should be understood that in the description of this application, the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. The terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, that is, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, unless otherwise specified, "multiple" means two or more.

[0027] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figure 1 and 2As shown, an embodiment of the present invention provides a thermal oxidation experimental device for polymer materials, comprising a sample box 1, a sample rack 2, an air supply assembly 3, a heating assembly 4, a circulating fan 5, and a control unit 6. The control unit 6 is capable of controlling the heating temperature of the sample box 1 by the heating assembly 4 and the air outlet speed of the circulating fan 5 within the sample box 1, so as to perform a thermal oxidation experiment on the sample 2 on the sample rack.

[0029] The sample box 1 comprises a box body 11 and a lid 12 mounted on the box body 11. The lid 12 is used to open and close the box body 11. The box body 11 is opened to allow samples to be placed on the sample holder 2 within the box body 1. The box body 11 is closed to seal the box body 11 for conducting thermal oxidation experiments. The samples are manufactured products made of polymer materials.

[0030] The sample rack 2 is disposed in the box 11 and is configured to rotate around the height direction z of the box 11. The sample rack 2 drives the sample to rotate in the sample box 1, which is conducive to keeping the sample heated evenly and maintaining the temperature stability of the sample.

[0031] Specifically, temperature stability includes three measurement parameters, namely temperature deviation, temperature uniformity and temperature fluctuation. Generally, the temperature stability of environmental test equipment is evaluated by combining these three parameters.

[0032] Temperature deviation △Tp refers to the deviation between the maximum and minimum temperatures measured at each measuring point in the workspace and the set temperature within a specified time period when the environmental test equipment is in a stable state. According to the temperature stability calibration requirements for environmental test equipment, the temperature deviation △Tp control requirements are △Tp ≤ ±2°C and △Tp ≤ ±3°C when the control temperature (or set temperature) is T ≤ 200°C and 200°C < T ≤ 300°C, respectively.

[0033] Temperature uniformity, ΔTu, refers to the maximum temperature difference between any two points in the workspace at a given moment when the environmental test equipment is in a stable state. This is calculated by taking the arithmetic mean of the difference between the highest and lowest temperatures in each measurement. According to the temperature stability calibration requirements for environmental test equipment, the temperature uniformity control requirements for control temperatures T≤200°C and 200°C<T≤300°C are ΔTu≤2.0°C and ΔTu≤3.0°C, respectively.

[0034] Temperature fluctuation ΔTj refers to the change in temperature over time at any point in the working space of an environmental test device within a specified time interval while the device is in a stable state. According to the temperature stability calibration requirements for environmental test equipment, the temperature fluctuation ΔTj control requirements are ΔTj ≤ 0.5°C and ΔTj ≤ 1°C when the control temperature is T ≤ 200°C and 200°C < T ≤ 300°C, respectively.

[0035] The air supply assembly 3 includes a first air supply port 31 and a second air supply port 32 mounted on the box cover 12. The first air supply port 31 is used to input air or nitrogen into the box body 11, and the second air supply port 32 is used to input oxygen into the box body 11. By inputting air or nitrogen, the concentration of oxygen can be reduced, while by inputting oxygen, the concentration of oxygen can be increased to meet the experimental requirements of different conditions.

[0036] The heating assembly 4 includes a heater 41 and a temperature measuring element 42. The heater 41 is mounted around the outer periphery of the housing 11. Multiple temperature measuring elements 42 are provided and are used to detect the temperature at different locations within the housing 11. The heater 41 can uniformly heat the housing 11, and the temperature measuring elements 42 can measure the temperature at different locations within the housing 11 in real time.

[0037] A circulation fan 5 is installed in the housing 11 and is used to circulate the air within the housing 11. The greater the wind speed of the circulation fan 5, the more uniform the air circulation within the housing 11, thereby increasing temperature stability. Conversely, the lower the wind speed of the circulation fan 5, the more uneven the air circulation within the housing 11, thereby decreasing temperature stability.

[0038] The control unit 6 is configured to control the heating temperature of the heater 41 and the output speed of the circulating fan 5 based on the temperature data detected by the temperature measuring element 42. By controlling the heating temperature of the heater 41 and the output speed of the circulating fan 5, the control unit 6 can adjust the heating temperature of the sample in the experimental environment and the temperature stability during the experiment. The control unit 6 includes a data collection and storage module.

[0039] During the experiment, the control unit 6 can adjust the heating temperature of the sample in the experimental environment and the temperature stability of the experimental process by controlling the heating temperature of the heater 41 and the output wind speed of the circulating fan 5 to meet different experimental requirements.

[0040] In one embodiment, housing 11 employs a sandwich structure to form an oil bath chamber 13. The outer wall of housing 11 is provided with an oil inlet 14 and an oil outlet 15, each communicating with oil bath chamber 13. Oil inlet 14 is located above oil outlet 15. Silicone oil is injected into oil bath chamber 13 through the oil inlet. Activating heater 41 heats the silicone oil, thereby uniformly heating housing 11 and improving temperature stability. Furthermore, high-temperature silicone oil can be injected directly into oil bath chamber 13 through the oil inlet to achieve uniform heating of housing 11.

[0041] In one embodiment, the thermal oxidation experimental device further includes a heat insulation cover 7, which covers the outer side of the heater 41. The heat insulation cover 7 has a heat preservation effect, which is beneficial to reduce heat loss and improve heating efficiency.

[0042] Illustratively, the sample rack 2 includes a motor 21, a rotating shaft 22 driven by the motor 21, and a tray 23 mounted on the rotating shaft 22 along the height direction z of the box 11. The motor 21 is mounted on the box cover 12. The rotating shaft 22 and the tray 23 are both located in the box 11. The tray 23 is used to place the sample. The motor 21 is electrically connected to the control unit 6. By starting the motor 21, the rotating shaft 22 and the tray 23 can be driven to rotate in the box 11, so that the sample can also rotate on the tray 23, achieving a uniform heating effect.

[0043] like Figure 1 As shown, in one embodiment, a baffle 51 is provided at the outlet of the circulating fan 5. The baffle 51 is mounted on the inner wall of the housing 11 and is used to prevent the airflow from the circulating fan 5 from being blown directly toward the sample. The baffle 51 blocks the airflow from the outlet of the circulating fan 5 and directs it along the height direction z of the housing, preventing hot air from blowing directly toward the sample during the experiment and affecting the accuracy and stability of the aging experiment.

[0044] Specifically, the heater 41 is an annular heating ring or a heating rod, and a plurality of heaters 41 are provided. The heating rings or heating rods are equidistantly arranged around the outer periphery of the box body 11 to maintain uniform heating.

[0045] In one embodiment, nine temperature measuring elements 42 are provided, with four temperature measuring elements 42 corresponding to the four sides of the upper portion of the interior of the box 11, one temperature measuring element 42 in the middle of the box 11, and four temperature measuring elements 42 corresponding to the four sides of the lower portion of the interior of the box 11. By arranging the temperature measuring elements 42 as described above, real-time testing and monitoring of the temperature at different locations within the box 11 can be achieved, making it easier to accurately grasp the actual temperature conditions and temperature uniformity at different locations within the box 11 during the experiment, and to understand the actual accuracy and reliability of the aging test. The temperature measuring elements 42 are thermocouples, and it is important to note that the connecting wires of the thermocouples must be kept away from the sample holder 2 and the sample to prevent the connecting wires from becoming entangled in the rotating sample holder 2.

[0046] The air supply assembly 3 further includes a pressure regulating valve 33, a pressure gauge 34, and an oxygen concentration meter 35, mounted on the box cover 12. The pressure gauge 34 is used to detect the air pressure within the box body 11, and the oxygen concentration meter 35 is used to detect the oxygen concentration within the box body 11. The pressure gauge 34 and the oxygen concentration meter 35 are electrically connected to the control unit 6. The control unit 6 analyzes the data from the pressure gauge 34 and the oxygen concentration meter 35 to control the pressure regulating valve 33 to ensure that the air pressure in the box body 11 is within a safe range.

[0047] In one embodiment, the thermal oxidation experimental device further includes a stand 8 and casters 81 installed at the bottom of the stand 8, and the sample box 1 is arranged in the stand 8. The stand 8 and the casters 81 make the overall structure easy to move.

[0048] In one embodiment, the thermal oxidation experimental apparatus further includes a lifting module 9, which is disposed below the sample box 1 and mounted on the stand 8. The lifting module 9 is configured to move the sample box 1 along the height direction z of the box body 11. Exemplarily, the lifting module 9 employs a lifting cylinder, which adjusts the height of the sample box 1 to facilitate sample removal.

[0049] Based on the above structural setting, the experimental heating temperature stability is dynamically adjusted by controlling the opening or closing of the circulating fan 5, whether the oil bath chamber 13 is configured for oil bath heating, and the opening or closing of the heater 41 to meet different experimental requirements.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present invention. These improvements and replacements should also be regarded as the scope of protection of the present invention.

Claims

1. A thermal oxidation experimental device for polymer materials, characterized in that: include: The sample box comprises a box body and a box cover provided on the box body, wherein the box cover is used to open or close the box body; a sample rack, disposed in the box, and configured to rotate around the height direction of the box; An air supply assembly includes a first air supply port and a second air supply port installed on the box cover, wherein the first air supply port is used to input air or nitrogen into the box, and the second air supply port is used to input oxygen into the box; A heating assembly, comprising a heater and a temperature measuring element, wherein the heater is mounted around the outer periphery of the box, and a plurality of temperature measuring elements are provided and used to detect the temperature at different positions in the box; A circulation fan is installed in the box, and is used to circulate the air in the box; and The control unit is configured to control the heating temperature of the heater and the output wind speed of the circulation fan according to the temperature data detected by the temperature measuring element.

2. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: The box body adopts a sandwich structure to form an oil bath cavity, and the outer wall of the box body is provided with an oil inlet and an oil outlet respectively connected with the oil bath cavity, and the oil inlet is located above the oil outlet.

3. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: A heat insulation cover is also included, and the heat insulation cover is covered on the outside of the heater.

4. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: The sample rack includes a motor, a rotating shaft driven by the motor, and a tray installed on the rotating shaft along the height direction of the box body. The motor is installed on the box cover. The rotating shaft and the tray are both arranged in the box body. The tray is used to place samples. The motor is electrically connected to the control unit.

5. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: The air outlet of the circulating fan is provided with a baffle at intervals, and the baffle is installed on the inner wall of the box body. The baffle is used to prevent the air flow blown out by the circulating fan from directly heading towards the sample.

6. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: The heater is an annular heating ring or a heating rod, and a plurality of heaters are provided.

7. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: There are nine temperature measuring elements, four of which are correspondingly arranged on the four sides of the upper interior of the box, one temperature measuring element is arranged on the middle of the box, and four of which are correspondingly arranged on the four sides of the lower interior of the box.

8. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: The air supply assembly also includes a pressure regulating valve, a pressure gauge and an oxygen concentration tester installed on the box cover. The pressure gauge is used to detect the air pressure in the box, and the oxygen concentration tester is used to detect the oxygen concentration in the box. The pressure gauge and the oxygen concentration tester are electrically connected to the control unit respectively.

9. The thermal oxidation experimental device for polymer materials according to claim 1, characterized in that: The utility model also comprises a stand and casters installed at the bottom of the stand, and the sample box is arranged in the stand.

10. The thermal oxidation experimental device for polymer materials according to claim 9, characterized in that: It also includes a lifting module, which is arranged below the sample box and is used to move the sample box along the height direction of the box body.

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