Dynamic friction temperature field measurement experiment device and experiment method

Abstract

The invention discloses a dynamic friction temperature field measurement experiment device which comprises a vertically arranged supporting rod and a first experiment sleeve vertically installed on one side of the lower portion of the supporting rod, a testing cavity is formed in the middle of the first experiment sleeve, and the first experiment sleeve is of a transparent structure; the temperature sensing sheet is mounted on the inner side surface of the first experiment sleeve, and a first sheet to be tested is mounted on the inner side surface of the temperature sensing sheet; a rotary drum is arranged below the second experiment sleeve, a second to-be-tested piece is sleeved outside the rotary drum, and the rotary drum and the test cavity are located on the same axis; according to the invention, through the arrangement of the transparent first experiment sleeve, students can directly observe the temperature change in the experiment process, no complex thermal infrared imager or other equipment is needed, and the complexity of experiment operation is reduced. A visual temperature sensing sheet is designed inside and can change color along with temperature change, so that temperature measurement becomes visual and easy to understand, and students can quickly master the law of temperature change.

Description

Technical Field

[0001] The invention discloses a dynamic friction temperature field measurement experimental device and an experimental method, belonging to the technical field of teaching experiments. Background Art

[0002] The dynamic friction temperature field measurement experiment is a method to study the heat generation, transfer and distribution characteristics during the friction process. By measuring the temperature field distribution in the friction pair in real time, the relationship between the friction heat effect and the friction performance can be analyzed, providing a theoretical basis for optimizing friction materials and improving designs.

[0003] During dynamic friction, due to the friction force of the contact surface, mechanical energy is converted into heat energy, causing the temperature to rise. The purpose of the experiment is to reveal the dynamic change law of temperature in this process. Different friction materials (such as metals, ceramics, composite materials) generate different amounts of heat during friction. By measuring the temperature field, the thermal stability and wear resistance of the material can be evaluated. The temperature distribution directly affects the thermal stress of the friction pair and its fatigue life. By measuring the temperature field, the material damage and wear law caused by thermal stress can be studied.

[0004] Existing friction temperature field measurement experiments require the use of high-precision equipment such as infrared thermal imagers, temperature sensors, and data acquisition systems. The operation and maintenance of these devices are difficult for students, especially without sufficient training, making it difficult for students to get started quickly.

[0005] Moreover, in many teaching sessions, experiments are often independent of theoretical teaching. Students can only understand theories such as frictional heat generation and heat transfer through data, which is not in-depth enough, resulting in the inability to effectively combine theoretical knowledge with actual measurement results during the experiment.

[0006] Therefore, a dynamic friction temperature field measurement experimental device and experimental method is designed that is easy to use and can be used proficiently after simple training, especially reducing the use of high-end precision instruments, and can more clearly show the experimental conclusions to students. Summary of the invention

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a dynamic friction temperature field measurement experimental device and an experimental method to solve the problems of the prior art.

[0008] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0009] A dynamic friction temperature field measurement experimental device, comprising:

[0010] A vertically arranged support rod, a first experimental set vertically arranged on one side below the support rod, a test cavity being arranged in the middle of the first experimental set, and the first experimental set being a transparent structure;

[0011] A temperature sensing sheet mounted on the inner side of the first experimental set, wherein the first piece to be tested is mounted on the inner side of the temperature sensing sheet;

[0012] A second experimental set is rotatably mounted on one side above the support rod, a rotating drum is arranged below the second experimental set, a second piece to be tested is sleeved on the outside of the rotating drum, and the rotating drum and the test cavity are on the same axis;

[0013] A driving assembly installed inside the second experimental set to drive the rotating drum and a lifting assembly to control the rise / descent of the driving assembly;

[0014] A first conductive sheet embedded on one side above the support rod, and a second conductive sheet embedded on one side of the second experimental set close to the support rod;

[0015] A control module and a speed regulating module, wherein the control module is electrically connected to the control drive, the lifting component, and the first conductive sheet of the speed regulating module;

[0016] Turning over the second experimental set, attaching or separating the first conductive sheet and the second conductive sheet;

[0017] During lamination, the control module cooperates with the lifting assembly to control the driving assembly to drive the second experimental set to rise / fall;

[0018] When descending, the first piece to be tested is attached to the second piece to be tested, and the control module cooperates with the driving assembly to control the rotating drum to drive the second piece to be tested to rotate and rub against the first piece to be tested, and cooperates with the speed adjustment module to adjust the speed of the rotating drum;

[0019] The temperature-sensitive color change of the temperature-sensitive sheet is observed through the first experimental set.

[0020] As a further improvement, the lifting assembly includes an air pump installed inside the second experimental set and a telescopic cylinder connected to the air pump. The output end of the telescopic cylinder is arranged vertically downward from the middle of the lower part of the second experimental set, and the drive assembly is fixedly installed at the end of the telescopic cylinder.

[0021] As a further improvement, the driving assembly includes a motor welded to the end of the telescopic cylinder, the driving end of the motor is plugged with a shaft, the shaft is plugged into the middle shaft of the drum and is welded and fixed to the drum;

[0022] A contact piece is fixedly installed below the rotating drum, and the contact piece is extended outward to form an extended portion, and the upper portion of the extended portion abuts against the lower side of the second piece to be tested.

[0023] As a further improvement, it also includes a plurality of groups of convex strips arranged on the outer annular surface of the drum, wherein the convex strips are arranged around the central axis of the drum;

[0024] The inner side surface of the second piece to be tested is provided with a guide groove matching the convex strip;

[0025] Through the guidance and cooperation of the convex strip and the guide groove, the second piece to be tested is slidably mounted on the rotating drum from the end of the rotating drum;

[0026] It also includes a ring arranged inside the second test sleeve, wherein the diameter of the ring is larger than that of the rotating cylinder and smaller than that of the second test piece.

[0027] As a further improvement, it also includes a display module embedded in the outer side of the first experimental set, and a temperature sensor arranged below the first experimental set, and the display module, temperature sensor and control module are electrically connected.

[0028] As a further improvement, it also includes a base, the support rod is vertically installed above the base, the control module is arranged inside the base, the support rod is hollow inside, and the power cord of the control module is welded and fixed to the first conductive sheet by passing through the hollow structure inside the support rod.

[0029] As a further improvement, the first test set includes a first hoop and a second hoop which are rotatably mounted on a support rod through a shaft, and the other ends of the first hoop and the second hoop are fixedly connected by bolts. By releasing the bolts, the first hoop and the second hoop can be rotated sideways around the shaft to expose the first test piece inside;

[0030] The temperature sensing pieces are respectively fitted and installed on the inner sides of the first hoop and the second hoop.

[0031] As a further improvement, the temperature sensing sheet includes a physical temperature sensing display sheet, and the physical temperature sensing display sheet displays different colors corresponding to different temperature ranges.

[0032] As a further improvement, the temperature sensing sheet adopts an electronic temperature sensing display sheet, and the electronic temperature sensing display sheet is electrically connected to the temperature sensor.

[0033] The beneficial effects of the present invention are:

[0034] The present invention provides a transparent first experimental set so that students can directly observe the temperature changes during the experiment, without the need for complex infrared thermal imagers and other equipment, thereby reducing the complexity of the experimental operation. The visual temperature sensing sheet designed inside can change color as the temperature changes, making temperature measurement intuitive and easy to understand, so that students can quickly grasp the law of temperature changes.

[0035] Specifically, the second experimental set can be flipped to make the first conductive sheet and the second conductive sheet fit together and be energized. The lifting assembly is started by electrical connection to make the rotating drum descend, so that the first piece to be tested fits the second piece to be tested, and the motor drives the rotating drum to drive the second piece to be tested to rotate, thereby generating friction with the first piece to be tested, and a friction experiment is performed.

[0036] When replacing the first piece to be tested, the first test set needs to be turned over. The first test set can be turned over 180° and placed on the support platform above the support rod to replace the first piece to be tested. During this period, the first conductive sheet is separated from the second conductive sheet, and the related electrical appliances inside the first test set are completely powered off, which improves the safety factor during operation. And by retracting the rotating drum into the second test set, the ring abuts against the second conductive sheet, and most of the second conductive sheet can be pushed out from the rotating drum, which is convenient for replacing the second conductive sheet.

[0037] Compared with the advantages of existing technologies, existing technologies require the use of high-precision equipment such as infrared thermal imagers, temperature sensors, and data acquisition systems, which are complex to operate and require professional training and guidance. However, this device has a simple structure and intuitive operation, which reduces the dependence on high-precision equipment, thus significantly reducing maintenance costs and operating difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a three-dimensional structural schematic diagram of a dynamic friction temperature field measurement experimental device of the present invention.

[0040] Figure 2 It is a top view of a dynamic friction temperature field measurement experimental device of the present invention.

[0041] Figure 3 The present invention is a schematic diagram of the cross-sectional structure of a dynamic friction temperature field measurement experimental device.

[0042] Figure 4 It is a three-dimensional partial enlarged structural schematic diagram of a dynamic friction temperature field measurement experimental device of the present invention.

[0043] Figure 5 It is a schematic diagram of a partially enlarged structure of a dynamic friction temperature field measurement experimental device in a standby state according to the present invention.

[0044] Figure 6 The present invention discloses a module connection diagram of a dynamic friction temperature field measurement experimental device.

[0045] 1. Support rod; 2. First experimental set; 21. Test cavity; 22. Temperature sensing piece; 23. First piece to be tested; 3. Second experimental set; 31. Rotating drum; 32. Second piece to be tested; 33. First conductive piece; 34. Second conductive piece; 35. Air pump; 36. Telescopic cylinder; 37. Motor; 38. Shaft; 39. Ring; 310. Abutment piece; 311. Extension part; 312. Raised strip; 313. Guide groove; 314. First hoop; 315. Second hoop; 4. Display module; 5. Temperature sensor; 6. Control module; 7. Base; 11. Support platform. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] Reference Figure 1-6 As shown, a dynamic friction temperature field measurement experimental device comprises:

[0049] A vertically arranged support rod 1, a first experimental set 2 vertically installed on one side below the support rod 1, a test cavity 21 is arranged in the middle of the first experimental set 2, and the first experimental set 2 is a transparent structure;

[0050] A temperature sensing piece 22 mounted on the inner side of the first experimental set 2, wherein a first test piece 23 is mounted on the inner side of the temperature sensing piece 22;

[0051] A second experimental set 3 is rotatably mounted on one side above the support rod 1, a rotating drum 31 is arranged below the second experimental set 3, a second test piece 32 is sleeved on the outside of the rotating drum 31, and the rotating drum 31 and the test cavity 21 are on the same axis;

[0052] A driving assembly installed inside the second experimental set 3, driving the rotating drum 31, and a lifting assembly controlling the rise / descent of the driving assembly;

[0053] A first conductive sheet 33 embedded on one side above the support rod 1, and a second conductive sheet 34 embedded on one side of the second experimental set 3 close to the support rod 1;

[0054] A control module 6 and a speed regulating module, wherein the control module 6 is electrically connected to the control drive, the lifting assembly, and the first conductive sheet 33 of the speed regulating module;

[0055] Turn over the second experimental set 3 to attach or separate the first conductive sheet 33 and the second conductive sheet 34;

[0056] During the bonding process, the control module 6 cooperates with the lifting assembly to control the driving assembly to drive the second experimental set 3 to rise / fall;

[0057] When descending, the first piece to be tested 23 is fitted with the second piece to be tested 32, and the control module 6 cooperates with the driving assembly to control the rotating drum 31 to drive the second piece to be tested 32 to rotate and rub against the first piece to be tested 23, and cooperates with the speed adjustment module to adjust the speed of the rotating drum 31;

[0058] The temperature-sensitive color change of the temperature-sensitive sheet 22 is observed through the first experimental set 2 .

[0059] When in use, the first test piece 23 and the second test piece 32 are installed in the device.

[0060] The experimental parameters, such as the rotation speed and the descending speed of the drum 31 , can be set by the control module 6 .

[0061] When started, the second test set 3 can be turned over to make the first conductive sheet 33 and the second conductive sheet 34 fit together to form an electrical connection. The control module 6 starts the lifting assembly through the electrical connection to make the rotating drum 31 descend, and the first test piece 23 and the second test piece 32 fit together.

[0062] During the experiment, the control module 6 starts the driving assembly through electrical connection, and the motor 37 drives the rotating drum 31 to drive the second test piece 32 to rotate, generating friction with the first test piece 23, and performing a friction experiment.

[0063] During the observation process, the temperature-sensitive color change of the temperature-sensitive sheet 22 is observed through the transparent first experimental set 2, and the color change process is recorded.

[0064] The temperature increases during the friction process, and the temperature field is visually displayed through the color change of the temperature-sensitive sheet 22 that is bonded to the second test sheet 32. Students can directly observe the temperature change process without the need for a complex infrared thermal imager and data acquisition system.

[0065] The second piece to be tested 32 is usually made of a material with good thermal conductivity, or a slot is provided on the second piece to be tested 32, and the temperature sensing piece 22 extends into the slot.

[0066] Since the color change process of the temperature sensing sheet 22 can help students intuitively understand the generation of frictional heat and the process of heat transfer, students can adjust the experimental parameters through the control module 6 and observe the changes in the temperature field under different conditions, thereby deepening their understanding of theoretical knowledge.

[0067] During the experiment, students can observe the changes of the temperature sensing piece 22 in real time. This instant feedback mechanism helps students better master experimental skills.

[0068] The experiment can be started and stopped by simply flipping and connecting the device electrically, without the need for complicated settings and calibration. Furthermore, through the color change of the temperature sensing sheet 22, students can intuitively see the change in the temperature field, without the need for a high-precision infrared thermal imager and temperature sensor 5.

[0069] Due to the use of the transparent experimental cover and the temperature-sensitive sheet 22, the material cost is low and easy to obtain, the equipment structure is simplified, the use of high-precision equipment is reduced, and the maintenance cost is greatly reduced.

[0070] When replacing the first piece to be tested 23, it is necessary to flip the first experimental set 2. The first experimental set 2 can be flipped 180° and placed on the supporting platform 11 above the supporting rod 1 to replace the first piece to be tested 23. During this period, the first conductive sheet 33 is separated from the second conductive sheet 34, and the related electrical appliances inside the first experimental set 2 are completely powered off, thereby improving the safety factor during operation.

[0071] And by retracting the rotating drum 31 into the second experimental set 3 , the collar 39 abuts against the second conductive sheet 34 , and most of the second conductive sheet 34 can be pushed out from the rotating drum 31 , so that the second conductive sheet 34 can be replaced easily.

[0072] The device has a simple structure and intuitive operation, which reduces the reliance on high-precision equipment, thus significantly reducing maintenance costs and operating difficulties. The device is not only suitable for tribology experiments, but can also be used for teaching in multiple disciplines such as heat transfer and material science, thus expanding the scope of teaching applications.

[0073] One side of the second experimental set 3 is rotatably mounted on the support rod 1 via the shaft 38. When in use, the second experimental set 3 is flipped clockwise to fit the first conductive sheet 33 and the second conductive sheet 34 together, so that the driving assembly and the lifting assembly are energized.

[0074] The lifting assembly includes an air pump 35 installed inside the second experimental set 3 and a telescopic cylinder 36 connected to the air pump 35. The output end of the telescopic cylinder 36 is arranged vertically downward from the middle of the lower part of the second experimental set 3, and the driving assembly is fixedly installed at the end of the telescopic cylinder 36.

[0075] The air pump 35 is electrically connected to the control module 6 . The control module 6 controls the air pump 35 to control the telescopic cylinder 36 to extend downward, thereby moving the rotating drum 31 downward and inserting it into the test cavity 21 .

[0076] During this period, the first test piece 23 and the second test piece 32 are attached to each other.

[0077] If it is recovered, the control module 6 controls the air pump 35 to control the telescopic cylinder 36 to retract upward, thereby moving the rotating drum 31 upward and out of the test chamber 21. During this period, the first test piece 23 and the second test piece 32 are separated.

[0078] The driving assembly includes a motor 37 welded to the end of the telescopic cylinder 36, a shaft 38 is inserted into the driving end of the motor 37, and the shaft 38 is inserted into the middle axis of the rotating drum 31 and is welded and fixed to the rotating drum 31, wherein the interior of the rotating drum 31 is hollow.

[0079] A contact piece 310 is fixedly installed below the rotating drum 31 . The contact piece 310 extends outward to form an extended portion 311 . The upper portion of the extended portion 311 abuts against the lower side of the second piece to be tested 32 .

[0080] The abutment sheet 310 is fixedly connected to the rotating drum 31 via bolts.

[0081] The air pump 35 type is small in size and light in weight, which is convenient for installation inside the second experimental set 3 and does not affect the overall appearance and operational convenience of the device.

[0082] In this embodiment, a silent air pump 35 is selected to ensure that the noise generated during the experiment is small and does not affect the students' observation and data recording. Specifically, it is a small silent air pump 35, such as PYES-20A. Rated voltage: 12V DC. Maximum air pressure: 8 bar (about 116 psi). Maximum flow: 60 L / min. Power consumption: 30 W. Weight: 1.5 kg. Protection level: IP54, suitable for teaching environment.

[0083] The air pump 35 should be able to provide a stable air pressure, generally in the range of 0-10 bar (about 0-145 psi), and the specific pressure is selected according to the needs of the telescopic cylinder 36. The flow rate of the air pump 35 should be moderate to ensure that the telescopic cylinder 36 can be quickly and smoothly extended and retracted, and the general flow rate is between 20-100 L / min.

[0084] The type of motor 37 is a small DC motor 37 with a small size and light weight, which is convenient for welding at the end of the telescopic cylinder 36. Ensure that the noise generated during the experiment is small and does not affect the students' observation and data recording. The motor 37 should have a moderate power, generally between 10-50W, and the specific power is selected according to the experimental needs. The motor 37 should be able to provide a stable rotation speed, generally ranging from 0-3000rpm, and the specific rotation speed is adjusted according to the experimental conditions. The motor 37 should have sufficient driving torque to ensure that it can stably drive the rotating drum 31 and the second test piece 32 to rotate, generally between 0.01-0.5Nm.

[0085] The motor 37 is a small DC motor 37, such as RS-385PH. Rated voltage: 12V DC. Maximum speed: 3000rpm.

[0086] Maximum torque: 0.2Nm. Power consumption: 20W. Weight: 0.2kg. Protection level: IP55, suitable for teaching environment.

[0087] After the lifting assembly controls the rotating drum 31 to descend, so that the first test piece 23 and the second test piece 32 are attached to each other, the motor 37 is electrically connected to the control module 6, and the motor 37 is started by the control module 6, and the rotating drum 31 is driven to rotate through the shaft 38. Then, the second test piece 32 fixed outside the rotating drum 31 is subjected to a friction test.

[0088] During the friction process, heat is generated between the first test piece 23 and the second test piece 32 to generate a temperature field.

[0089] When the rotating drum 31 rises and resets, and the second piece to be tested 32 needs to be replaced:

[0090] It is necessary to turn the second experimental set 3 counterclockwise, and place the back of the second experimental set 3 against the top of the support plate, so as to separate the first conductive sheet 33 from the second conductive sheet 34, thereby first completing the power-off operation of the driving assembly and the lifting assembly;

[0091] The abutment piece 310 is further disassembled by removing the abutment piece 310 and the rotating mounting screw, so that the second piece to be tested 32 can be separated from the rotating drum 31, and a new second piece to be tested 32 is re-inserted into the rotating drum 31, and the abutment piece 310 is reinstalled and reset to complete the replacement of the second piece to be tested 32.

[0092] In order to reduce the load of the motor 37 , the interior of the drum 31 is configured as a hollow structure, which can reduce the overall weight of the drum 31 .

[0093] In order to ensure that the second test piece 32 can always maintain a stable installation state with the rotating drum 31 during the test, a plurality of groups of convex strips 312 are provided on the outer annular surface of the rotating drum 31, and the convex strips 312 are arranged around the central axis of the rotating drum 31;

[0094] The inner side surface of the second test piece 32 is provided with a guide groove 313 matching the convex strip 312;

[0095] Through the guidance of the convex strip 312 and the guide groove 313 , the second test piece 32 is slidably mounted on the rotating drum 31 from the end of the rotating drum 31 .

[0096] It also includes a display module 4 embedded in the outer side of the first experiment cover 2 and a temperature sensor 5 arranged below the first experiment cover 2. The display module 4, the temperature sensor 5 and the control module 6 are electrically connected.

[0097] The temperature sensor 5 is located between the temperature sensing piece 22 and the first piece to be tested 23. The temperature generated by the friction between the first piece to be tested 23 and the second piece to be tested 32 is monitored by the temperature sensor 5 and transmitted to the control module 6. The temperature is transcoded by the control module 6 and displayed by the display module 4, wherein the display module 4 is an electronic display screen.

[0098] The temperature field generated by the friction between the first test piece 23 and the second test piece 32 is detected by the temperature sensor 5, and the specific temperature of the temperature field is intuitively displayed on the electronic display screen.

[0099] It also includes a base 7, the support rod 1 is vertically installed above the base 7, the control module 6 is arranged inside the base 7, the support rod 1 is hollow inside, and the power cord of the control module 6 is welded and fixed to the first conductive sheet 33 by passing through the hollow structure inside the support rod 1.

[0100] The support rod 1 and the base 7 can be fixedly connected by welding.

[0101] The first test set 2 includes a first hoop 314 and a second hoop 315 rotatably mounted on the support rod 1 via an axis 38. The other ends of the first hoop 314 and the second hoop 315 are fixedly connected by bolts. By releasing the bolts, the first hoop 314 and the second hoop 315 can be rotated sideways around the axis 38 to expose the first test piece 23 inside.

[0102] The temperature sensing piece 22 is respectively installed on the inner side of the first hoop 314 and the inner side of the second hoop 315 .

[0103] The first hoop ring 314 and the second hoop ring 315 that can be unfolded can facilitate replacement of the first test piece 23 inside.

[0104] The temperature sensing sheet 22 includes a physical temperature sensing display sheet, and the physical temperature sensing display sheet displays different colors corresponding to different temperature ranges.

[0105] The temperature-sensitive display sheet is made of a material with thermochromic properties, which usually produces rich color changes after being heated.

[0106] Materials that change color when heated are usually thermochromic. The following materials change color when the temperature changes:

[0107] Liquid crystal materials, because their molecular arrangement is very sensitive to temperature changes, can reflect light of specific wavelengths, thereby showing different colors:

[0108] Such as cholesteric liquid crystal: commonly used in heat-sensitive strips, thermometers, etc. As the temperature rises, the color changes from red to orange, yellow, green, blue and then to purple.

[0109] Oxide materials, some metal oxides will change color when heated, usually due to structural changes or redox reactions:

[0110] For example, cobalt oxide (CoO): changes from green to blue when heated. For example, iron oxide (Fe2O3 and Fe3O4): changes from reddish brown to black when heated.

[0111] Organic thermochromic dyes, organic dye molecules change their chemical structure when the temperature changes, thus showing different colors:

[0112] Such as spirooxazine dyes: when heated, they change from colorless to blue or purple.

[0113] Optical films and nanomaterials. The interference effect of optical films changes with temperature, thus showing different colors:

[0114] Such as barium titanate (BaTiO3) film: has temperature-sensitive reflection properties.

[0115] Metal nanoparticles (such as gold and silver): Due to the surface plasmon resonance effect, they can change color when heated.

[0116] Certain minerals and crystals exhibit color changes when heated due to changes in their optical or chemical properties:

[0117] Such as titanium sapphire: the color changes from blue to pink when heated.

[0118] Metallic materials and alloys, metal surfaces show interference colors through changes in the thickness of the oxide layer when heated:

[0119] Such as titanium, aluminum, and steel: As the thickness of the oxide film changes, the surface will appear blue, yellow, purple, etc.

[0120] Thermochromic polymer materials, polymer materials can show color changes caused by temperature changes by embedding thermochromic molecules:

[0121] Such as polyethylene or polypropylene inlay dyes: can be used in toys and heat-sensitive devices.

[0122] In this embodiment, a typical cholesteric liquid crystal material is used, and a specific example range of the color change of the cholesteric liquid crystal material with temperature (assuming that the operating temperature range of the material is 20° C. to 60° C.) is:

[0123] 20℃-25℃: Red

[0124] 26℃-30℃: Orange

[0125] 31℃-35℃: Yellow

[0126] 36℃-45℃: Green

[0127] 46℃-55℃: blue

[0128] 56℃-60℃: Purple

[0129] Over 60℃: no obvious color (transparent or faded)

[0130] Since the specific values ​​of different materials may vary to a certain extent, in actual applications it is necessary to refer to the technical parameter table provided by the manufacturer of the liquid crystal material for calibration.

[0131] A dynamic friction temperature field measurement experimental method, the steps of which include:

[0132] S1: Experimental preparation:

[0133] Install the piece to be tested:

[0134] Remove the bolts on the first hoop 314 and the second hoop 315 of the first test set 2, so that the first test set 2 is rotated sideways around the shaft 38 to expose the first test piece 23 inside;

[0135] Install the first test piece 23 and ensure that it fits on the inner side of the temperature sensing piece 22;

[0136] Turn the second experimental set 3 counterclockwise to separate the first conductive sheet 33 from the second conductive sheet 34;

[0137] The mounting screws between the contact piece 310 and the rotating drum 31 are removed, the contact piece 310 is disassembled, and the second piece to be tested 32 is separated from the rotating drum 31 .

[0138] A new second test piece 32 is installed, and the contact piece 310 is reinstalled and reset.

[0139] Connect the power supply:

[0140] Ensure that the power line of the control module 6 is welded and fixed to the first conductive sheet 33 through the inner hollow structure of the support rod 1 .

[0141] Set the experimental parameters:

[0142] The experimental parameters, such as the rotation speed and the descending speed of the drum 31 , are set by the control module 6 .

[0143] S2: Experiment start:

[0144] Flip the second experiment set 3:

[0145] The second experimental set 3 is turned over clockwise to make the first conductive sheet 33 and the second conductive sheet 34 fit together to form an electrical connection.

[0146] Start the lifting assembly:

[0147] The air pump 35 is started by the control module 6 to control the telescopic cylinder 36 to extend downward, so that the rotating drum 31 descends and is inserted into the test cavity 21 .

[0148] Confirm that the first test piece 23 and the second test piece 32 are attached to each other.

[0149] S3: Experimental conduct:

[0150] Start the driver component:

[0151] The motor 37 is started by the control module 6 , and the rotating drum 31 is driven to rotate by the shaft 38 , so that the second piece to be tested 32 and the first piece to be tested 23 generate friction.

[0152] Adjust the speed:

[0153] The speed of the motor 37 is adjusted by the speed adjustment module, and the change of the temperature field at different speeds is observed.

[0154] Observe the temperature field:

[0155] The temperature-sensitive color change of the temperature-sensitive sheet 22 is observed through the transparent first experimental set 2, and the color change process is recorded.

[0156] The specific temperature data monitored by the temperature sensor 5 is viewed through the display module 4 and recorded.

[0157] S4: End of experiment:

[0158] Stop the drive assembly:

[0159] The motor 37 is stopped by the control module 6 to stop the rotation of the drum 31 .

[0160] Recovery drum 31:

[0161] The air pump 35 is started by the control module 6 to control the telescopic cylinder 36 to be retracted upward, so that the rotating drum 31 moves upward and is pulled out of the test chamber 21 .

[0162] It is confirmed that the first test piece 23 and the second test piece 32 are separated.

[0163] Power off operation:

[0164] The second experimental set 3 is turned counterclockwise to separate the first conductive sheet 33 from the second conductive sheet 34 and disconnect the electrical connection.

[0165] Example 2

[0166] This embodiment is basically the same as Embodiment 1, except that:

[0167] The temperature sensing sheet 22 is an electronic temperature sensing display sheet, and the electronic temperature sensing display sheet is electrically connected to the temperature sensor 5 .

[0168] Through the cooperation between the electronic temperature sensing piece 22 and the temperature sensor 5, different colors are displayed corresponding to different temperature ranges.

[0169] It should be noted that the device structure and the drawings of the present invention mainly describe the principle of the present invention. In terms of the technology of the design principle, the settings of the power mechanism, power supply system and control system of the device are not fully described. On the premise that the technical personnel in this field understand the principle of the above invention, the details of the power mechanism, power supply system and control system can be clearly known. The control method of the application document is automatic control through a controller, and the control circuit of the controller can be realized by simple programming by the technical personnel in this field.

[0170] The standard parts used therein can all be purchased from the market and can be customized according to the instructions and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the structures and principles of the components known to technical personnel in this field can be known by these technical personnel through technical manuals or through conventional experimental methods.

[0171] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A dynamic friction temperature field measurement experimental device, characterized in that: include: A vertically arranged support rod (1), a first experimental set (2) vertically arranged on one side below the support rod (1), a test cavity (21) being arranged in the middle of the first experimental set (2), and the first experimental set (2) being a transparent structure; A temperature sensing sheet (22) mounted on the inner side of the first experimental set (2), wherein a first test sheet (23) is mounted on the inner side of the temperature sensing sheet (22); A second experimental sleeve (3) is rotatably mounted on one side above the support rod (1), a rotating drum (31) is disposed below the second experimental sleeve (3), a second test piece (32) is sleeved on the outside of the rotating drum (31), and the rotating drum (31) and the test chamber (21) are on the same axis; A driving assembly installed inside the second experimental set (3) to drive the rotating drum (31), and a lifting assembly to control the rise / descent of the driving assembly; A first conductive sheet (33) embedded on one side above the support rod (1), and a second conductive sheet (34) embedded on one side of the second experimental set (3) close to the support rod (1); A control module (6) and a rotation speed regulating module, wherein the control module (6) is electrically connected to the control drive, the lifting component, and the first conductive sheet (33) of the rotation speed regulating module; Turning over the second experimental set (3) to attach or separate the first conductive sheet (33) and the second conductive sheet (34); During the bonding process, the control module (6) cooperates with the lifting assembly to control the driving assembly to drive the second experimental set (3) to rise / fall; When descending, the first piece to be tested (23) is in contact with the second piece to be tested (32), and the control module (6) cooperates with the driving assembly to control the rotating drum (31) to drive the second piece to be tested (32) to rotate and rub against the first piece to be tested (23), and cooperates with the speed adjustment module to adjust the speed of the rotating drum (31); The temperature-sensitive color change of the temperature-sensitive sheet (22) is observed through the first experimental set (2).

2. The dynamic friction temperature field measurement experimental device according to claim 1, characterized in that: The lifting assembly comprises an air pump (35) installed inside the second experimental set (3), and a telescopic cylinder (36) connected to the air pump (35), wherein the output end of the telescopic cylinder (36) is arranged vertically downward from the middle of the lower part of the second experimental set (3), and the driving assembly is fixedly installed at the end of the telescopic cylinder (36).

3. The dynamic friction temperature field measurement experimental device according to claim 2, characterized in that: The driving assembly comprises a motor (37) welded to the end of the telescopic cylinder (36), a shaft (38) is inserted into the driving end of the motor (37), and the shaft (38) is inserted into the middle shaft of the rotating drum (31) and is welded and fixed to the rotating drum (31); A contact piece (310) is fixedly mounted below the rotating cylinder (31), and the contact piece (310) extends outward to form an extended portion (311), and the upper portion of the extended portion (311) abuts against the lower portion of the second piece to be tested (32).

4. The dynamic friction temperature field measurement experimental device according to claim 3 is characterized in that: It also includes a plurality of groups of convex strips (312) arranged on the outer annular surface of the rotating drum (31), wherein the convex strips (312) are arranged around the central axis of the rotating drum (31); The inner side surface of the second test piece (32) is provided with a guide groove (313) matching the convex strip (312); Through the guidance and cooperation of the convex strip (312) and the guide groove (313), the second piece to be tested (32) is slidably mounted on the rotating drum (31) from the end of the rotating drum (31); It also includes a ring (39) arranged inside the second experimental sleeve (3), wherein the diameter of the ring (39) is larger than the diameter of the rotating cylinder (31) and smaller than the diameter of the second test piece (32).

5. The dynamic friction temperature field measurement experimental device according to claim 4 is characterized in that: It also includes a display module (4) embedded in the outer side of the first experimental set (2), and a temperature sensor (5) arranged below the first experimental set (2), wherein the display module (4), the temperature sensor (5) and the control module (6) are electrically connected.

6. The dynamic friction temperature field measurement experimental device according to claim 5, characterized in that: It also includes a base (7), the support rod (1) is vertically mounted above the base (7), the control module (6) is arranged inside the base (7), the support rod (1) is hollow inside, and the power cord of the control module (6) passes through the hollow structure inside the support rod (1) and is welded and fixed to the first conductive sheet (33).

7. The dynamic friction temperature field measurement experimental device according to claim 6, characterized in that: The first test set (2) comprises a first hoop (314) and a second hoop (315) which are rotatably mounted on the support rod (1) via a shaft (38); the other ends of the first hoop (314) and the second hoop (315) are fixedly connected via bolts; by releasing the bolts, the first hoop (314) and the second hoop (315) can be rotated sideways around the shaft (38) to expose the first test piece (23) inside; The temperature sensing piece (22) is respectively mounted on the inner side surfaces of the first hoop (314) and the second hoop (315).

8. The dynamic friction temperature field measurement experimental device according to claim 7 is characterized in that: The temperature sensing sheet (22) comprises a physical temperature sensing display sheet, and the physical temperature sensing display sheet displays different colors corresponding to different temperature ranges.

9. The dynamic friction temperature field measurement experimental device according to claim 7 is characterized in that: The temperature sensing sheet (22) is an electronic temperature sensing display sheet, and the electronic temperature sensing display sheet is electrically connected to the temperature sensor (5).

10. A method for using a dynamic friction temperature field measurement experimental device according to any one of claims 1 to 9, comprising the steps of: S1: Experimental preparation: Install the piece to be tested: Remove the bolts on the first hoop (314) and the second hoop (315) of the first test set (2), so that the first hoop (314) and the second hoop (315) are rotated sideways around the shaft (38) to expose the first test piece (23) inside; Install the first test piece (23) and ensure that it fits on the inner side of the temperature sensing piece (22); Turning the second experimental set (3) counterclockwise to separate the first conductive sheet (33) from the second conductive sheet (34); Remove the mounting screws of the contact piece (310) and the rotating drum (31), disassemble the contact piece (310), and separate the second piece to be tested (32) from the rotating drum (31); Install a new second piece to be tested (32), and reinstall and reset the abutting piece (310); Connect the power supply: Ensure that the power line of the control module (6) is welded and fixed to the first conductive sheet (33) through the internal hollow structure of the support rod (1); Set the experimental parameters: Setting experimental parameters, such as the rotation speed and descending speed of the drum (31), through the control module (6); S2: Experiment start: Flip the second experiment set (3): Turn the second experimental set (3) clockwise to make the first conductive sheet (33) and the second conductive sheet (34) fit together to form an electrical connection; Start the lifting assembly: The air pump (35) is started by the control module (6), and the telescopic cylinder (36) is controlled to extend downward, so that the rotating drum (31) descends and is inserted into the test cavity (21); Confirming that the first piece to be tested (23) and the second piece to be tested (32) are in contact with each other; S3: Experimental conduct: Start the driver component: The motor (37) is started by the control module (6), and the rotating drum (31) is driven to rotate by the shaft (38), so that the second piece to be tested (32) and the first piece to be tested (23) generate friction; Adjust the speed: The speed of the motor (37) is adjusted by a speed adjustment module, and the change of the temperature field at different speeds is observed; Observe the temperature field: Observe the temperature-sensitive color change of the temperature-sensitive sheet (22) through the transparent first experimental set (2) and record the color change process; Viewing the specific temperature data monitored by the temperature sensor (5) through the display module (4) and recording it; S4: End of experiment: Stop the drive assembly: The motor (37) is stopped by the control module (6), so that the rotating drum (31) stops rotating; Recovery drum (31): The air pump (35) is started by the control module (6), and the telescopic cylinder (36) is controlled to be retracted upward, so that the rotating drum (31) moves upward and is withdrawn from the test chamber (21); Confirming that the first piece to be tested (23) and the second piece to be tested (32) are separated; Power off operation: The second experimental set (3) is turned counterclockwise to separate the first conductive sheet (33) from the second conductive sheet (34) and disconnect the electrical connection.

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