A high-low temperature rubber hardness calibration device

Abstract

The utility model discloses a high low temperature rubber hardness calibration device, including main box, high low temperature test workroom, heating system, self -adaptation bearing system, hardness measuring device, vice box, refrigeration processing system, and the main box bottom layer is provided with the shock pad, and the vice box is independent of the main box setting, and the refrigeration processing system is contained, and the high low temperature test workroom is set up in the main box inside, and the hardness measuring device carries out multipoint hardness measurement to sample, and including loading module and test module, and the test module includes the head and lengthens the rod pressure foot, and lengthens the rod pressure foot and can be inserted into the inside workroom, and the head outer surface is coated with the antiseized coating and the hydrophobic nano coating, and the self -adaptation bearing system sets up in the inside workroom, and the intelligent control system includes control unit and thermal hysteresis compensation module, and thermal hysteresis compensation module is used to carry out thermal hysteresis compensation, and the output corrected actual hardness value. The utility model can realize the rubber hardness's automation, high accuracy, large capacity test under high low temperature environment.

Description

Technical Field

[0001] This utility model belongs to the field of rubber hardness measurement, and specifically relates to a high and low temperature rubber hardness calibration device. Background Technology

[0002] In extreme environments such as aerospace, polar exploration, and deep-sea exploration, the hardness properties of rubber products directly affect the safety and reliability of equipment operation. For example, aircraft seals must maintain stable sealing performance amidst temperature fluctuations ranging from -50°C to 120°C, and rubber shock-absorbing components in polar research equipment must withstand impacts at temperatures as low as -60°C. These scenarios all require precise measurement of the hardness values ​​of rubber materials under high and low temperature environments to provide core data support for material selection and structural design.

[0003] Currently, accurate calibration of the hardness of rubber materials under high and low temperature environments faces multiple challenges. Traditional high and low temperature test chambers suffer from insufficient temperature field uniformity (typically >±2℃), slow humidity control response (difficult to quickly drop below the dew point), and vibration interference from the refrigeration system affecting measurement accuracy. Furthermore, manual operation is inefficient and cannot meet the needs of large-scale, continuous testing. The thermal hysteresis effect caused by drastic temperature changes significantly affects the accuracy of initial hardness values ​​(deviations often exceed ±0.3HA), and rubber residue adhering to the indenter also affects repeatability. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems by providing a high and low temperature rubber hardness calibration device that enables automated and high-precision testing of rubber hardness under high and low temperature environments.

[0005] To achieve the above objectives, one aspect of this utility model provides a high and low temperature rubber hardness calibration device, comprising a main chamber, a high and low temperature test chamber, a heating system, an adaptive load-bearing system, a hardness measuring device, a secondary chamber, and a refrigeration system. The bottom of the main housing is equipped with a shock-absorbing base made of high-damping material to absorb external and internal vibrations. The auxiliary housing is set independently of the main housing and is used to house the refrigeration system. The main housing and the auxiliary housing are connected flexibly to isolate high-frequency vibrations. The high and low temperature test chamber is located inside the main chamber and has a built-in heating system, temperature sensor and micro dehumidification module. The heating system uses electric heating elements to achieve rapid heating. The temperature sensor monitors the temperature of the chamber in real time. The micro dehumidification module can quickly control the humidity of the sample area below the dew point temperature with a response time of ≤30 seconds. The hardness measuring device is used to perform multi-point hardness measurement on the sample. It includes a loading module and a testing module. The loading module is used to apply pressure to the testing module. The testing module includes an indenter and an extension rod foot. The extension rod foot can extend into the high and low temperature test chamber. The outer surface of the indenter is coated with an anti-stick coating and a hydrophobic nano-coating. The adaptive load-bearing system is installed inside the high and low temperature test chamber and includes a rotary table, a servo drive assembly, and a pressure adaptive mechanism. The rotary table is used to carry multiple samples; the servo drive assembly is used to drive the rotary table to rotate and sequentially transfer the samples to the pressing position of the hardness measuring device, realizing automatic switching of the sample station; the pressure adaptive mechanism is used to detect the sample height deviation in real time and automatically adjust the pressure foot stroke. The intelligent control system includes a control unit and a thermal hysteresis compensation module. The control unit is electrically connected to the heating system, the refrigeration system, the adaptive load system, and the hardness measuring device. It is used to control the heating system and the refrigeration system to adjust the temperature in the high and low temperature test chamber, control the servo drive component to drive the rotary table to rotate, and control the loading module to apply pressure to the test module. The thermal hysteresis compensation module is used to perform thermal hysteresis compensation and output the corrected actual hardness value.

[0006] Preferably, the thermal hysteresis compensation module constructs the following heat conduction equation: Where T is the temperature, and λ, ρ, and c are the thermal conductivity, density, and specific heat capacity of the rubber material, respectively. The thermal hysteresis compensation module is based on the rate of temperature change. Under certain conditions, thermal hysteresis compensation is triggered to correct the deviation between the ambient temperature and the hardness measurement value, and the corrected actual hardness value is output.

[0007] Preferably, the test module further includes a fixing block, an interface, a plug-in, a positioning pin, a main body, a spring, a displacement sensor, and a main rod assembly; The fixing block is installed on the loading module to ensure the stability of the test process. The interface is used to connect with the loading module to realize communication with the loading module and the intelligent control system. The plug and positioning pin are used to install the test module to the loading module. The main body is used to install the displacement sensor and the main rod assembly. The spring is used to realize stress compensation. The main rod assembly is used to transfer the force of the spring to the sample through the indenter.

[0008] Preferably, the intelligent control system further includes an interaction unit and a storage unit. The interaction unit is used to receive voice commands, scan sample barcodes, or manually input parameters; the storage unit is used to pre-store historical detection parameters and support data backtracking.

[0009] Preferably, the micro dehumidification module has a replaceable structure, supports molecular sieve adsorption components or condensation membrane components, and has a response time of ≤30 seconds, which can effectively prevent condensation from affecting the test accuracy.

[0010] Preferably, the main chamber door is sealed with a silicone sealing strip, and sealing mechanisms are designed on the top surface of the chamber for installing the adaptive load-bearing system and for the experimental holes for moving and testing the hardness measuring device.

[0011] Preferably, the intelligent control system integrates machine learning algorithms, including: A convolutional neural network classification module is used to identify the texture of rubber surfaces; The dynamic path optimization module is used to generate detection paths based on historical temperature-hardness curve clusters.

[0012] Preferably, the hydrophobic nanocoating of the pressure head is a graphene-polytetrafluoroethylene composite material, which can reduce the coefficient of friction and prevent rubber material adhesion.

[0013] The high and low temperature rubber hardness calibration device according to the above aspects of this utility model can realize automated and high-precision testing of rubber hardness under high and low temperature environments. Attached Figure Description

[0014] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the main structure of a high and low temperature rubber hardness calibration device according to an embodiment of this utility model; Figure 2 This is a schematic diagram of a separate arrangement of the auxiliary box and the main box according to an embodiment of the present invention; Figure 3 This is a schematic diagram of an adaptive load-bearing system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of a hardness measuring device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a test module according to an embodiment of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] One embodiment of this utility model provides a high and low temperature rubber hardness calibration device, as shown in Figure 1. The calibration device of this utility model embodiment includes a main chamber 12, a high and low temperature test chamber 13, a heating system, an adaptive load-bearing system 1, a hardness measuring device 2, a secondary chamber 11, a refrigeration system, and an integrated control cabinet 3.

[0017] like Figure 1 As shown, the main chamber 12 is equipped with a transparent observation window, inside which is the high and low temperature test chamber 13; the walls of the high and low temperature test chamber 13 are equipped with a resistance wire heating system and a temperature sensor; the interior of the high and low temperature test chamber 13 is equipped with an adaptive bearing system 1, and the sample position of the adaptive bearing system 1 is equipped with a hardness measuring device 2 that can be pressed; a secondary chamber 11 is equipped at the rear of the main chamber 12.

[0018] The main enclosure 12 is made of high-quality steel plate with a powder-coated surface, providing excellent corrosion resistance and aesthetics. The transparent observation window on the main enclosure 12 is made of double-layered tempered glass, facilitating operator observation of the test conditions inside the high and low temperature test chamber 13, while also offering good thermal insulation. A shock-absorbing base is also installed at the bottom of the main enclosure 12, and the refrigeration system is housed in a separate auxiliary enclosure 11. The auxiliary enclosure for the refrigeration system, located behind the main enclosure 12, is separate from the main enclosure. Figure 2 As shown, the vibration suppression structure reduces the overall vibration amplitude of the device, thereby reducing the transmission of vibration generated by the compressor operation to the main housing.

[0019] The secondary enclosure is specifically designed to house the refrigeration system (such as a refrigeration compressor), reducing vibration transmission through physical isolation. The main enclosure has a shock-absorbing base at its bottom, made of high-damping materials (such as rubber or polyurethane), which effectively absorbs external and internal vibrations, ensuring the stability of hardness testing. A flexible connection is used between the main and secondary enclosures to further isolate high-frequency vibrations, keeping the overall vibration amplitude of the device within 0.01 mm.

[0020] The high and low temperature test chamber is located inside the main enclosure and houses a heating system, temperature sensor, and miniature dehumidification module. The heating system uses electric heating elements (such as resistance wire) for rapid temperature rise (up to 10°C / min). The temperature sensor is a PT100 platinum resistance thermometer with an accuracy of ±0.5°C, providing real-time monitoring of the chamber temperature. The miniature dehumidification module is replaceable and supports either molecular sieve adsorption or condensation membrane modules, quickly controlling the humidity in the sample area below the dew point temperature with a response time ≤30 seconds, effectively preventing condensation from affecting test accuracy. The chamber temperature range covers -50°C to +150°C.

[0021] The inner walls of the high and low temperature test chamber are made of stainless steel, which is easy to clean and can withstand the effects of high and low temperature environments. The chamber is equipped with a resistance wire heating system, the power of which can be adjusted according to actual needs, enabling rapid heating of the chamber to the required high temperature environment. A high-precision PT100 temperature sensor is used to monitor the internal temperature of the chamber in real time and transmit the temperature signal to the intelligent control system.

[0022] The adaptive load-bearing system is installed inside the high and low temperature test chamber, such as... Figure 3 As shown, the device includes a servo drive assembly 21, a support rod 22, an upper flange 23, a positioning plate 24, a rotary table 25, and a lower flange 26. The rotary table 25 is, for example, a turntable. The servo drive assembly 21 enables automatic sample station switching (e.g., an intermittent rotation mechanism), supports uninterrupted batch testing, and reduces manual intervention. The servo drive assembly 21 controls the rotation of the rotary table 25, achieving automatic sample transfer. The rotary table 25 can carry multiple samples and perform multi-point hardness testing on each sample, enabling uninterrupted testing. The servo drive assembly 21 uses a high-performance servo motor, characterized by high control precision and fast response speed. Multiple sample positioning plates 24 are evenly distributed on the rotary table 25 for placing rubber samples. During testing, the servo drive assembly 21 drives the rotary table 25 to rotate, sequentially transferring samples to the pressing positions of the hardness measuring device, achieving automatic sample station switching and supporting uninterrupted batch testing. Each sample needs to undergo hardness testing at five points. Through the precise control of the intelligent control system, the rotating worktable can be accurately stopped at the corresponding position to ensure the smooth progress of the test and to achieve uninterrupted testing.

[0023] In one embodiment, the rotary stage includes a sample-bearing module and a stage base. The sample-bearing module is connected to the stage base via a tapered tolerance fit, accommodating samples with diameters of 3-60 mm and heights of 2-50 mm. The adaptive bearing system is also equipped with a pressure adaptive mechanism, which detects sample height deviation in real time (accuracy ±0.01 mm) and automatically adjusts the pressure foot stroke to compensate for sample size changes.

[0024] The hardness measuring device is equipped with various replaceable probes and corresponding extension rod indenters. When different rubber hardness testing methods are required, only the appropriate probe and extension rod indenter need to be replaced, improving the equipment's versatility and adaptability. In one embodiment, such as... Figure 1 and Figure 4 As shown, the hardness measuring device includes a loading module 8, a testing module 7, a column 6, and a base 34. It is suitable for high and low temperature environments and features an extended design compared to conventional rubber hardness testers, allowing it to extend into the high and low temperature test chamber for pressure testing. Figure 5 As shown, the test module 7 includes a fixing block 41, a housing 42, a pressure foot 43, a pressure head, an interface 44, a pull plug 45, a positioning pin 46, a main body 47, a spring 48, a displacement sensor 49, and a main rod assembly 10. The fixing block 41 is precisely positioned and fixed to the loading module 8 to ensure the stability of the test process. The housing 42 is made of high-temperature and low-temperature resistant materials, which can effectively protect the internal structure. The pressure foot 43 can flatten and press the sample surface during the test to ensure that the sample does not move during the test. The pressure head is made of high-strength material and can accurately press the sample to complete the test. The outer surface of the pressure head is covered with an anti-stick coating and a hydrophobic nano-coating (total thickness 5-50μm). The hydrophobic nano-coating is a graphene-polytetrafluoroethylene composite material, which significantly reduces the coefficient of friction (average coefficient of friction ≤0.08), prevents rubber material adhesion, and reduces test adhesion errors. The interface 44 is used to connect with the loading module 8 to realize communication with the loading module 8 and the host, which facilitates data transmission and the issuance of control commands. The plug-in 45 and positioning pin 46 allow the test module to be easily installed onto the loading module 8, improving the efficiency of equipment maintenance and replacement. The main body 47 is used to install components such as the main rod and displacement sensor 49. The spring 48 adopts a special double-spring structure, and before use, it undergoes screening, debugging, and stress relief treatment using a spring testing device to achieve stress compensation and form a high-precision linear loading mode with a fixed force, meeting the standard load requirements of the hardness tester. The displacement sensor 49 can accurately measure the indentation depth of the indenter. The main rod assembly 10 includes the main rod and bearings, which can transmit the spring force to the sample through the indenter and ensure that the force is applied vertically, ensuring the accuracy of the measurement results. The test module integrates a high-precision sensor (accuracy ±0.01HA) to acquire hardness data in real time.

[0025] The main chamber door is sealed with a silicone sealing strip, providing excellent sealing performance. Sealing mechanisms are designed at the top of the chamber for installing the adaptive load-bearing system and for the experimental holes used to move the rubber hardness tester's main rod and conduct tests. Through this multi-layered sealing structure, the overall sealing performance of the device is effectively improved, ensuring the stability of the internal temperature of the high and low temperature test chamber.

[0026] The calibration device in this embodiment of the invention also includes a temperature chamber control cabinet 3. The temperature chamber control cabinet houses the control components and intelligent control system of the high and low temperature environment testing system. The control components employ PID control, enabling precise control of the temperature within the high and low temperature testing chamber. Furthermore, it communicates in real-time with the intelligent control system, facilitating remote monitoring and data management. The intelligent control system includes an interaction unit, a storage unit, a control unit, and a thermal hysteresis compensation module. The interaction unit receives voice commands, scans sample barcodes, or manually inputs parameters. The storage unit pre-stores historical test parameters, supporting data backtracking. The control unit is electrically connected to the heating system, cooling system, adaptive load system, and hardness measuring device, automatically configuring operating parameters (such as temperature and loading force).

[0027] The thermal hysteresis compensation module corrects for the deviation between the ambient temperature and the initial hardness value based on a heat conduction model. In one embodiment, the thermal hysteresis compensation module constructs the heat conduction equation: (Where T is temperature, λ, ρ, and c are the thermal conductivity, density, and specific heat capacity of the rubber material, respectively; λ = 0.1-0.5 W / m•K, c = 1.2-2.5 kJ / kg•K); Real-time acquisition of the current temperature, calculation of the temperature change rate, and when the temperature change rate... When the temperature is high, thermal hysteresis compensation is triggered to correct the deviation between the ambient temperature and the initial hardness value, and the corrected actual hardness value is output. The ambient temperature deviation is ≤ ±0.3HA.

[0028] The intelligent control system also integrates machine learning algorithms, including: a convolutional neural network (CNN) classification module to identify rubber surface texture with a material type recognition accuracy of ≥95%; and a dynamic path optimization module to generate detection paths based on historical temperature-hardness curve clusters, reducing test time by 30%.

[0029] In practical use, the rubber sample is placed on the rotating platform of the adaptive load-bearing system, the main chamber door is closed, and the required test temperature is set via the temperature chamber control cabinet. The control system controls the heating or cooling system to ensure the high and low temperature test chamber reaches the set temperature. Then, the adaptive load-bearing system transfers the sample to the pressure position of the hardness measuring device, which performs a hardness test. The test data is transmitted to the main unit via a communication module for processing and storage. During the test, the operator can observe the test through a transparent viewing window.

[0030] In summary, the high and low temperature rubber hardness calibration device of this utility model embodiment is suitable for fully automatic high-precision rubber hardness testing in high and low temperature environments. It has the advantages of low vibration, good sealing performance, high degree of automation, strong adaptability, and precise control. It can meet the high-precision testing requirements of rubber hardness in high and low temperature environments and integrates five key technologies: vibration suppression structure (separation of main and auxiliary chambers + shock-absorbing base) to reduce interference; high-precision temperature and humidity chamber (rapid response dehumidification ≤30 seconds to below the dew point); adaptive load-bearing system (rotary station + pressure adaptive mechanism ±0.01mm adjustment) to achieve uninterrupted batch testing; anti-stick and anti-interference hardness measurement (with indenter with a specific thickness of anti-stick / hydrophobic nano-coating); and intelligent control system (integrating interaction, storage, control, and thermal hysteresis compensation based on a thermal conduction model).

[0031] This invention's high and low temperature rubber hardness calibration device solves the problems of vibration and moisture interference in high and low temperature environments through split-body vibration reduction, rapid dehumidification, and multiple sealing technologies. The adaptive load-bearing system enables high-precision continuous testing of samples of various sizes, and AI algorithms optimize detection efficiency and accuracy. The application of a thermal hysteresis compensation model and an anti-stick coating significantly improves the reliability of hardness measurement under extreme temperature conditions. This device achieves fully intelligent, unattended, and large-capacity testing of rubber hardness calibration, making it suitable for high-precision quality control requirements in harsh environments.

[0032] Compared with the prior art, the high and low temperature rubber hardness calibration device of this utility model has the following beneficial effects: Structural design optimization: The main and auxiliary chambers are designed as separate structures. The bottom of the main chamber is equipped with a shock-absorbing base to significantly reduce operating vibration and ensure test stability. The chamber door is sealed with a silicone sealing strip, and the test holes are equipped with a sealing design to improve the overall airtightness. Precise environmental control: The experimental chamber integrates a heating system, temperature sensor, and replaceable micro dehumidification module (supporting molecular sieve adsorption or condensation membrane components), which can control the humidity of the sample area below the dew point to ensure a low-humidity environment; High testing efficiency: Equipped with a servo-driven rotary table, it can automatically switch sample stations, support uninterrupted batch testing, and optimize detection efficiency with AI algorithms. High measurement accuracy: The indenter surface is coated with an anti-stick coating and a hydrophobic nano-coating (graphene-PTFE composite material, total thickness 5–50 μm) to reduce test adhesion errors; a thermal hysteresis compensation model is applied, combined with AI algorithms, to improve the accuracy and reliability of hardness measurement under extreme temperature conditions. High level of intelligence: The intelligent system includes an interaction unit, a storage unit, and a control unit, which can automatically configure parameters to achieve full-process intelligence and unattended operation.

[0033] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high and low temperature rubber hardness calibration device, characterized in that, It includes the main chamber, high and low temperature test chamber, heating system, adaptive load-bearing system, hardness measuring device, auxiliary chamber, and refrigeration system. The bottom of the main housing is equipped with a shock-absorbing base made of high-damping material to absorb external and internal vibrations. The auxiliary housing is set independently of the main housing and is used to house the refrigeration system. The main housing and the auxiliary housing are connected flexibly to isolate high-frequency vibrations. The high and low temperature test chamber is located inside the main chamber and has a built-in heating system, temperature sensor and micro dehumidification module. The heating system uses electric heating elements to achieve rapid heating. The temperature sensor monitors the temperature of the chamber in real time. The micro dehumidification module can quickly control the humidity of the sample area below the dew point temperature with a response time of ≤30 seconds. The hardness measuring device is used to perform multi-point hardness measurement on the sample. It includes a loading module and a testing module. The loading module is used to apply pressure to the testing module. The testing module includes an indenter and an extension rod foot. The extension rod foot can extend into the high and low temperature test chamber. The outer surface of the indenter is coated with an anti-stick coating and a hydrophobic nano-coating. The adaptive load-bearing system is installed inside the high and low temperature test chamber and includes a rotary table, a servo drive assembly, and a pressure adaptive mechanism. The rotary table is used to carry multiple samples; the servo drive assembly is used to drive the rotary table to rotate and sequentially transfer the samples to the pressing position of the hardness measuring device, realizing automatic switching of the sample station; the pressure adaptive mechanism is used to detect the sample height deviation in real time and automatically adjust the pressure foot stroke. The intelligent control system includes a control unit and a thermal hysteresis compensation module. The control unit is electrically connected to the heating system, the refrigeration system, the adaptive load system, and the hardness measuring device. It is used to control the heating system and the refrigeration system to adjust the temperature in the high and low temperature test chamber, control the servo drive component to drive the rotary table to rotate, and control the loading module to apply pressure to the test module. The thermal hysteresis compensation module is used to perform thermal hysteresis compensation and output the corrected actual hardness value.

2. The apparatus according to claim 1, characterized in that, The thermal hysteresis compensation module constructs the following heat conduction equation: Where T is the temperature, and λ, ρ, and c are the thermal conductivity, density, and specific heat capacity of the rubber material, respectively. The thermal hysteresis compensation module is based on the rate of temperature change. Under certain conditions, thermal hysteresis compensation is triggered to correct the deviation between the ambient temperature and the hardness measurement value, and the corrected actual hardness value is output.

3. The apparatus according to claim 1 or 2, characterized in that, The test module also includes a fixing block, interface, plug-in connector, positioning pin, main body, spring, displacement sensor and main rod assembly; The fixing block is installed on the loading module to ensure the stability of the test process. The interface is used to connect with the loading module to realize communication with the loading module and the intelligent control system. The plug and positioning pin are used to install the test module to the loading module. The main body is used to install the displacement sensor and the main rod assembly. The spring is used to realize stress compensation. The main rod assembly is used to transfer the force of the spring to the sample through the indenter.

4. The apparatus according to claim 1 or 2, characterized in that, The intelligent control system also includes an interaction unit and a storage unit. The interaction unit is used to receive voice commands, scan sample barcodes, or manually input parameters; the storage unit is used to pre-store historical detection parameters and support data backtracking.

5. The apparatus according to claim 1 or 2, characterized in that, The miniature dehumidification module has a replaceable structure and supports molecular sieve adsorption components or condensation membrane components. The response time is ≤30 seconds, which can effectively prevent condensation from affecting the test accuracy.

6. The apparatus according to claim 1 or 2, characterized in that, The main chamber door is sealed with a silicone sealing strip, and the top surface of the chamber is designed with sealing mechanisms for installing the adaptive load-bearing system and for the experimental holes for moving and testing the hardness measuring device.

7. The apparatus according to claim 1 or 2, characterized in that, The intelligent control system integrates machine learning algorithms, including: A convolutional neural network classification module is used to identify the texture of rubber surfaces; The dynamic path optimization module is used to generate detection paths based on historical temperature-hardness curve clusters.

8. The apparatus according to claim 1 or 2, characterized in that, The hydrophobic nano-coating of the pressure head is a graphene-polytetrafluoroethylene composite material, which can reduce the coefficient of friction and prevent rubber material adhesion.

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