Creep testing machine integrated with multiple temperature control areas

Abstract

The invention provides a creep testing machine integrated with multiple temperature control areas, an experiment area of the testing machine is divided into a plurality of independent temperature control areas by high-efficiency heat insulation materials, each temperature control area is connected with the same servo motor through a high-precision lever mechanism (17), the high-precision lever mechanism comprises a plurality of levers (19), and the levers (19) are connected with the servo motor through a high-efficiency heat insulation material. One end of each lever is connected with a screw rod at the power output end of the servo motor through an adjustable fulcrum, and the other end of each lever outputs a loading force required by the test process of the temperature control area to each temperature control area through a component force output end, so that the dynamic distribution of the output force of the servo motor is realized by adjusting the position of the fulcrum; the requirements of different test conditions in different temperature control areas are met; the device can be used for realizing the function of carrying out a creep test under multiple independent temperature conditions at the same time, and by designing multiple independent temperature control areas on the same equipment, a user can obtain creep data under different temperature conditions at the same time in one test, so that the test efficiency and the result accuracy are improved.

Description

Technical Field

[0001] The invention relates to the technical field of material testing equipment, in particular to a creep testing machine with integrated multi-temperature control areas. Background Art

[0002] Creep testing is an important method for studying the deformation of materials over time under high temperature or stress conditions. Most existing creep testing equipment is designed with a single temperature control zone, which limits the test efficiency and makes it impossible to obtain creep data under multiple temperature conditions on the same device at the same time. This not only prolongs the test cycle, but also may affect the accuracy of the test results due to differences between different devices. Therefore, it is of great practical significance to design a creep testing machine that can realize multiple independent temperature control zones on the same device. Summary of the invention

[0003] The present invention proposes a creep testing machine with integrated multi-temperature control zones, which is used to realize the function of performing creep tests under multiple independent temperature conditions at the same time. By designing multiple independent temperature control zones on the same device, the user can obtain creep data under different temperature conditions in one test, thereby improving the test efficiency and the accuracy of the results.

[0004] The present invention adopts the following technical solutions.

[0005] A creep testing machine with integrated multiple temperature control zones, wherein the test zone of the testing machine is divided into a plurality of independent temperature control zones by means of high-efficiency heat-insulating materials, each temperature control zone being connected to the same servo motor via a high-precision lever mechanism (17), the high-precision lever mechanism comprising a plurality of levers (19), one end of each lever being connected to a screw rod at a power output end of a servo motor via an adjustable fulcrum, the other end of the lever being a force component output end for outputting a loading force required for a temperature control zone test process to each temperature control zone, so that the dynamic distribution of the servo motor output force can be achieved by adjusting the fulcrum position, thereby meeting the requirements of different test conditions in different temperature control zones.

[0006] The test machine is powered by a DC bias power supply and includes a high temperature component, a multi-temperature zone temperature control system, a test system, a loading and monitoring system, and an auxiliary system; The high temperature components include: a high temperature CT stretching tool, a multi-temperature furnace embedded with a multi-temperature zone control module, and a sample clamping bracket for fixing the test sample; The sample clamping bracket is connected to the force output end of the lever; The multi-temperature zone temperature control system includes: temperature control box and temperature control system, temperature sensor, temperature data acquisition module; The test system includes: test control system and software; The loading system includes: force sensor, displacement sensor; The monitoring system includes an embedded control system; The auxiliary system includes: multi-channel data acquisition module, abnormal monitoring and alarm function module.

[0007] The experimental area of ​​the test machine is arranged in the furnace cavity of the multi-temperature furnace, and the furnace cavity is divided into three independent temperature control areas: a low temperature area (5), a medium temperature area and a high temperature area (7) by vertical insulation boards; Low temperature zone: designed as the left side of the furnace chamber, used for low temperature material testing, with a temperature control range of room temperature to 200°C; High temperature zone: designed as the far right of the furnace chamber, suitable for high temperature tests, with a temperature control range of 600°C to over 1000°C; Medium temperature zone: located between the low temperature zone and the high temperature zone, with a temperature control range of 200°C to 600°C, serving as a transition zone; each temperature control zone is vertically isolated using a heat insulation board (8) made of a high-efficiency heat insulation material, and the thickness of the heat insulation material is designed to be 10-20 mm to ensure that thermal interference between the temperature control zones is minimized; The temperature control system includes an independent heating device (9) and a temperature sensor (10) provided in each temperature control area; the resistance wire of the heating device is arranged around the sample to ensure uniform heating of the sample; the heating device is fixed on the inner side of the heat insulation board and fixed by a high temperature resistant bracket to avoid direct contact with the sample; The heat insulation board (8) is fixed by a frame inside the multi-temperature furnace cavity, a sealing structure for reducing heat leakage is arranged around the heat insulation board, and a heat insulation layer is arranged in each temperature control area, and the heat insulation layer is formed of a material with a low thermal conductivity coefficient to reduce heat radiation and heat conduction; The testing machine uses a plurality of independent clamping devices (4) to clamp the sample, and each clamping device is distributed along the vertical direction inside the furnace chamber and is located at the center of the low temperature (5), medium temperature (6) and high temperature (7) areas respectively; Each clamping device (4) is fixed inside the multi-temperature furnace cavity by a high-strength heat-resistant bracket to ensure stability and accuracy; The clamping part of the sample is made of high temperature resistant alloy material (such as nickel-chromium alloy) to withstand the mechanical stress in high temperature environment; The sample clamping device can adapt to the size and requirements of different materials or test samples by adjusting the clamping force; The sample clamping device uses the fine-tuning function to ensure that the sample and the force axis of the loading device are accurately aligned. Each set of clamping devices corresponds to a temperature control area and is used to fix samples under different test conditions. The loading module is driven by a servo motor (1), which applies the load required for the test to each test sample through a lever mechanism (17), and the force component output end of the lever of the lever mechanism is connected to the loading rod of the sample clamping device through a sealing hole.

[0008] The temperature data acquisition module arranges at least 2-3 temperature monitoring points (14) at the center of each temperature control area and on the upper, lower and side surfaces of the wall to ensure accurate and uniform temperature measurement. The temperature sensor is connected to the embedded controller through the data acquisition module to feedback temperature control data in real time; The signal line of the sensor adopts high temperature resistant shielded cable, which is led out through the cable hole of the multi-temperature furnace body and connected to the external data acquisition module; The temperature of each temperature control area is adjusted with high precision through the adaptive PID control algorithm. The temperature control module of the temperature control system is embedded on the outside of the multi-temperature furnace body. The heating device and the temperature sensor are connected through high-temperature resistant cables. The temperature control module can dynamically set the target temperature, and the adjustment range can be configured according to the test requirements. The control circuit adopts a partitioned independent design to avoid interference and improve operational reliability. After the user inputs the target temperature during the test, the temperature control system automatically executes the adaptive PID control algorithm and dynamically adjusts the heating power according to the temperature deviation, so that the temperature of each temperature control area quickly reaches the set temperature and is stably controlled within ±0.1℃.

[0009] The main body of the lever is made of high-strength, low-deformation material, and the surface of the lever main body is sprayed or electroplated to enhance corrosion resistance and wear resistance; The main body of the lever is a frame structure, and the upper end and the lower end of the frame structure are respectively a force input end and an output end; The two end fulcrums of each lever are respectively arranged at the screw rod at the force input end and the force output end, and the fulcrums are arranged at the screw rod (18) in a proportional manner and are laterally distributed at the screw rod to adjust the magnitude of the input force and the output force; During the test, the servo motor applies a total input force through the screw (18), and the total input force is transmitted to the lever (19) and then distributed to the corresponding lever force component output end (20) according to the position ratio of the lever fulcrum. If the same force is to be applied to each sample, the position of the fulcrum is evenly distributed. Assume that the testing machine has three temperature control zones, and it is required to apply loading forces of 100N, 150N and 200N to the three samples respectively. The position of the fulcrum is adjusted according to the target loading force ratio (1:1.5:2); the servo motor applies the total input force through the ball screw, and the force is transmitted to the lever and distributed to the three output ends in proportion.

[0010] The auxiliary system is connected to the monitoring system, and uses a high-precision data acquisition module to collect temperature data, sample deformation data and loading force data of each temperature control area in real time, and transmits the data to the monitoring system; When collecting temperature data of each temperature control area in real time, each temperature control area is equipped with an independent temperature sensor (10) (such as a thermocouple or a thermistor). The temperature data of the temperature sensor is collected by collecting temperature signals through a multi-channel ADC module. The multi-channel ADC module is installed on the outer side of the furnace body or in the electric control box, close to the exit position of the signal line of the temperature sensor (10) to reduce the signal transmission distance and external interference. The module is connected to the side frame of the furnace body through a fixed bracket or a mounting plate. The data acquisition frequency of the data acquisition module is set to 1 Hz or higher to capture subtle fluctuations in temperature and deformation data acquisition: When collecting the sample deformation data of each temperature control area in real time, a displacement sensor (12) (such as an LVDT or an optical fiber displacement sensor) is installed at the sample loading end of each test sample, and an independent displacement sensor (12) is arranged at each sample loading end; the displacement sensor (12) is fixed to the lower end of the loading rod or the side of the sample clamping device to ensure that the sensor can accurately measure the deformation amount of the sample during the loading process. According to the size of the sample, the position of the displacement sensor (12) is fine-tuned by an adjustable bracket to ensure that the sensor is aligned with the deformation direction of the sample, and the deformation of the sample is monitored in real time. The sample deformation data is transmitted to the central control system of the monitoring and control system through a high-speed acquisition interface, supporting a resolution of up to 0.01mm; When collecting the loading force data of each temperature control area in real time: the loading force of each sample is recorded by a stress sensor, and each sample clamping device (4) corresponds to a stress sensor (15). The stress sensor is installed at the connection between the loading rod and the sample clamping device to monitor the force value applied by the loading rod to the sample in real time. The end of the loading rod is also directly connected to a force sensor (11), which is fixed to the sample clamping device by a thread or a buckle to ensure that the force sensor can accurately measure the loading force in the vertical direction. The force sensor adopts a high-temperature resistant sensor structure and is installed at the bottom of the loading rod. It is isolated from the furnace cavity temperature zone by a heat insulation material to ensure the operation stability in a high-temperature environment; ensure real-time monitoring and feedback of the load, and control the data accuracy within 0.1N. The signal of the force sensor (11) is led out through an anti-interference shielded line and connected to a data acquisition module installed outside the furnace. The collected data is filtered and calibrated by an embedded processor; The embedded system combines the calibration algorithm to dynamically correct the collected data, eliminate sensor errors, and ensure that the accuracy is within ±0.1°C; and the data is synchronously processed and stored through the embedded control system.

[0011] The embedded control system and the data acquisition module are centrally installed in an electric control box (16). The electric control box (16) is arranged at the lower part of the main body of the testing machine and forms an integrated structure with the main body. The data acquisition module is arranged on the side frame of the multi-temperature furnace body and maintains a short-distance connection with the embedded control system and the electric control box (16). The data acquisition module improves the reliability of test data through its built-in abnormality monitoring and alarm functions.

[0012] The central control system runs on an embedded processor, which uses a distributed architecture to coordinate the operation of multiple temperature zones, loading modules and data acquisition modules; The user sets the target temperature and loading parameters for each temperature zone through the human-computer interaction interface of the central control system, and views the temperature, deformation and load curves during the test in real time.

[0013] The method for using a creep testing machine with integrated multi-temperature control zones is provided. The creep testing machine forms multiple heating zones by partitioning its multi-temperature furnace. The heating zone is a temperature control zone, so as to simultaneously perform creep crack tensile tests at different temperatures. The device includes multiple temperature control execution modules, each temperature control execution module corresponds to a heating zone. The method for using the device includes the following steps: Step S1: construct a multi-temperature control zone creep test device, which includes multiple temperature control zones, each of which is equipped with an independent temperature adjustment unit, a temperature sensor and a loading module to achieve precise temperature control and loading of each temperature control zone; Step S2: Install different material samples in the sample fixtures of the clamping devices of each temperature control zone, set the target temperature of each temperature control zone, and apply a constant load to the sample through the loading module; Step S3: The temperature data, loading force data and sample deformation data of each temperature control area are collected in real time through the data acquisition module, and the data are systematically recorded through multi-channel data acquisition; the collected data are analyzed in real time by the data processing unit to ensure the stability of the temperature control area; Step S4: After the test is completed, the experimental data of different temperature control areas are summarized, a creep curve model of the material under multi-temperature conditions is established, the temperature-dependent creep behavior of the material is analyzed, and a long-term performance prediction of the material under multi-temperature conditions is generated.

[0014] In step S1, each temperature control area is composed of an independent heating device, a temperature sensor and a PID controller; in step S2, the loading module is driven by a servo motor, and the high temperature tensile CT tool (2) is controlled by a lever mechanism (17) to push the loading rod to apply a load to the sample; that is, the load is distributed to multiple temperature zones through the lever mechanism; in step S3, the data acquisition module includes a displacement sensor, a temperature sensor and a stress sensor, which are used to record deformation, temperature and load respectively; The control system of the creep testing machine uses an embedded processor to adjust the temperature control module in real time and coordinate the operation of each module. The embedded control system monitors the actual output of each force output end in real time through a force sensor. The force sensor detects the loading force value of the sample in real time and feeds it back to the central controller of the monitoring system; the central controller dynamically adjusts the output force of the servo motor through a closed-loop control algorithm to ensure constant loading force.

[0015] The heat insulation board is a ceramic fiber board or an aerogel board.

[0016] The high-precision lever mechanism is linked with the force sensor to monitor the load size of each output end in real time, and realizes closed-loop regulation through the embedded control system to ensure the accuracy and stability of the loading force.

[0017] The creep testing machine with integrated multi-temperature control zones includes a basic structure: a DC bias power supply, a test host, high-temperature components, a multi-temperature zone temperature control system, a test system, a loading and monitoring system, and an auxiliary system. The test host includes: an electronic universal test host, the high-temperature components include: a high-temperature CT stretching tool, a multi-temperature furnace (low temperature, medium temperature, high temperature) embedded with a multi-temperature zone control module, and a sample clamping bracket. The multi-temperature zone temperature control system includes: a temperature control box and a temperature control system, a temperature sensor, and a temperature data acquisition module. The test system includes: a test control system and software. The loading and monitoring system includes: a force sensor, a displacement sensor, and an embedded control system. The auxiliary system includes: a multi-channel data acquisition module, an abnormal monitoring and alarm function. The creep crack tensile test at different temperatures is performed simultaneously by dividing the temperature furnace into zones. The equipment communicates with multiple temperature control execution modules and a current transformer, and each temperature control execution module corresponds to a heating zone.

[0018] The present invention provides a multi-temperature control zone creep testing machine. By designing a plurality of independent temperature control zones on the same device, a user can simultaneously obtain creep data under different temperature conditions in one test, thereby improving test efficiency and result accuracy.

[0019] The present invention designs multiple independent temperature control areas, each of which is equipped with an independent heating device and temperature sensor, and is physically isolated by thermal insulation materials to reduce temperature interference between temperature zones. In the present invention, the temperature of each temperature control area is adjusted with high precision through an adaptive PID control algorithm to ensure that the temperature control accuracy is stable within ±0.1°C.

[0020] In the present invention, the sample clamping module adopts multiple groups of independent clamping devices, each group of clamping devices corresponds to a temperature control zone, and is used to fix samples under different test conditions. The loading module is driven by a servo motor, and a constant load is applied to each sample through a lever mechanism, and supports the synchronous loading and independent control of multiple samples. Since the present invention integrates a high-precision lever mechanism, it is used to accurately distribute the load applied by the servo motor to multiple temperature control zones. The lever mechanism includes a lever body, an adjustable fulcrum and a force distribution output end. The dynamic distribution of force is achieved by adjusting the fulcrum position, which can meet the needs of different test conditions. The lever mechanism is linked with the force sensor to monitor the load size of each output end in real time, and closed-loop adjustment is achieved through an embedded control system, which can ensure the accuracy and stability of the loading force.

[0021] The present invention integrates a high-precision data acquisition module for real-time acquisition of temperature data, sample deformation data, and loading force data of each temperature control area, and synchronously processes and stores the data through an embedded control system. In addition, the data acquisition module supports abnormal monitoring and alarm functions, which can further improve the reliability of test data.

[0022] The beneficial effect of the present invention is that the creep testing machine with integrated multi-temperature control zones can efficiently and stably apply a constant load to each sample, and can meet the complex test requirements of multiple samples and multiple temperature zones. The overall performance of the equipment has been improved, and the test efficiency and data reliability have been significantly improved, which has brought significant technical advantages for scientific research and industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Attached Figure 1 It is a schematic diagram of a creep testing machine with integrated multi-temperature control zones in the present invention; Attached Figure 2 is a schematic diagram of a servo motor in the present invention; Attached Figure 3 It is a schematic diagram of a temperature control box in the present invention; Attached Figure 4 It is a schematic diagram of the interior of the cavity of the multi-temperature furnace in the present invention; Attached Figure 5 It is a cross-sectional schematic diagram of the high temperature zone in the present invention; Attached Figure 6 It is a schematic diagram of a high-precision lever mechanism; In the figure: 1-servo motor; 2. high temperature CT stretching tool; 3. multi-temperature furnace; 4. clamping device; 5. low temperature zone; 6. medium temperature zone; 7. high temperature zone; 8. heat insulation board; 9. heating device; 10. Temperature sensor; 11. Force sensor; 12. Displacement sensor; 13. Temperature control box; 14. Temperature detection point; 15. Stress sensor; 16. Electric control box; 17. High-precision lever structure; 18. Lead screw; 19. Lever; 20. Lever force output end. DETAILED DESCRIPTION

[0024] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] As shown in the figure, a creep testing machine with integrated multiple temperature control zones is shown, wherein the experimental area of ​​the testing machine is divided into multiple independent temperature control zones by high-efficiency thermal insulation materials, and each temperature control zone is connected to the same servo motor via a high-precision lever mechanism 17. The high-precision lever mechanism includes multiple levers 19, and one end of each lever is connected to a screw rod at a power output end of the servo motor via an adjustable fulcrum, and the other end of the lever outputs the loading force required for the test process of the temperature control zone to each temperature control zone via a force component output end, so as to achieve dynamic distribution of the servo motor output force by adjusting the fulcrum position, thereby meeting the requirements of different test conditions in different temperature control zones.

[0026] The test machine is powered by a DC bias power supply and includes a high temperature component, a multi-temperature zone temperature control system, a test system, a loading and monitoring system, and an auxiliary system; The high temperature components include: a high temperature CT stretching tool, a multi-temperature furnace embedded with a multi-temperature zone control module, and a sample clamping bracket for fixing the test sample; The sample clamping bracket is connected to the force output end of the lever; The multi-temperature zone temperature control system includes: temperature control box and temperature control system, temperature sensor, temperature data acquisition module; The test system includes: test control system and software; The loading system includes: force sensor, displacement sensor; The monitoring system includes an embedded control system; The auxiliary system includes: multi-channel data acquisition module, abnormal monitoring and alarm function module.

[0027] The experimental area of ​​the test machine is set in the furnace cavity of the multi-temperature furnace, and the furnace cavity is divided into three independent temperature control areas: low temperature area 5, medium temperature area and high temperature area 7 by vertical insulation boards; Low temperature zone: designed as the left side of the furnace chamber, used for low temperature material testing, with a temperature control range of room temperature to 200°C; High temperature zone: designed as the far right of the furnace chamber, suitable for high temperature tests, with a temperature control range of 600°C to over 1000°C; Medium temperature zone: located between the low temperature zone and the high temperature zone, with a temperature control range of 200°C to 600°C, serving as a transition zone; each temperature control zone is vertically isolated using an insulation board 8 made of high-efficiency insulation material, and the thickness of the insulation material is designed to be 10-20 mm to ensure that thermal interference between temperature control zones is minimized; The temperature control system includes an independent heating device 9 and a temperature sensor 10 provided in each temperature control area; the resistance wire of the heating device is arranged around the sample to ensure uniform heating of the sample; the heating device is fixed on the inner side of the insulation board and fixed by a high temperature resistant bracket to avoid direct contact with the sample; The heat insulation board 8 is fixed by the frame inside the multi-temperature furnace cavity. A sealing structure for reducing heat leakage is arranged around the heat insulation board. A heat insulation layer is arranged in each temperature control area. The heat insulation layer is formed of a material with a low thermal conductivity coefficient to reduce heat radiation and heat conduction. The test machine uses multiple independent clamping devices 4 to clamp the sample, and each clamping device is distributed along the vertical direction inside the furnace chamber and is located at the center of the low temperature 5, medium temperature 6 and high temperature 7 areas respectively; Each clamping device 4 is fixed inside the multi-temperature furnace cavity by a high-strength heat-resistant bracket to ensure stability and accuracy; The clamping part of the sample is made of high temperature resistant alloy materials such as nickel-chromium alloy to withstand the mechanical stress in high temperature environment; The sample clamping device can adapt to the size and requirements of different materials or test samples by adjusting the clamping force; The sample clamping device uses the fine-tuning function to ensure that the sample and the force axis of the loading device are accurately aligned. Each set of clamping devices corresponds to a temperature control area and is used to fix samples under different test conditions. The loading module is driven by a servo motor 1, which applies the load required for the test to each test sample through a lever mechanism 17, and the force output end of the lever of the lever mechanism is connected to the loading rod of the sample clamping device through a sealing hole.

[0028] The temperature data acquisition module arranges at least 2-3 temperature monitoring points 14 at the center of each temperature control area and on the upper, lower and side surfaces of the wall to ensure accurate and uniform temperature measurement. The temperature sensor is connected to the embedded controller through the data acquisition module to feedback the temperature control data in real time; The signal line of the sensor adopts high temperature resistant shielded cable, which is led out through the cable hole of the multi-temperature furnace body and connected to the external data acquisition module; The temperature of each temperature control area is adjusted with high precision through the adaptive PID control algorithm. The temperature control module of the temperature control system is embedded on the outside of the multi-temperature furnace body. The heating device and the temperature sensor are connected through high-temperature resistant cables. The temperature control module can dynamically set the target temperature, and the adjustment range can be configured according to the test requirements. The control circuit adopts a partitioned independent design to avoid interference and improve operational reliability. After the user inputs the target temperature during the test, the temperature control system automatically executes the adaptive PID control algorithm and dynamically adjusts the heating power according to the temperature deviation, so that the temperature of each temperature control area quickly reaches the set temperature and is stably controlled within ±0.1℃.

[0029] The main body of the lever is made of high-strength, low-deformation material, and the surface of the lever main body is sprayed or electroplated to enhance corrosion resistance and wear resistance; The main body of the lever is a frame structure, and the upper end and the lower end of the frame structure are respectively a force input end and an output end; The two end fulcrums of each lever are respectively arranged at the screw rod at the force input end and the force output end, and the fulcrum is arranged at the screw rod 18 and is distributed horizontally at the screw rod in proportion to adjust the magnitude of the input force and the output force; During the test, the servo motor applies a total input force through the screw 18, and the total input force is transmitted to the lever 19 and distributed to the corresponding lever force output end 20 according to the position ratio of the lever fulcrum. If the same force is to be applied to each sample, the position of the fulcrum is evenly distributed. Assume that the testing machine has three temperature control zones, and it is required to apply loading forces of 100N, 150N and 200N to the three samples respectively. The position of the fulcrum is adjusted according to the target loading force ratio of 1:1.5:2; the servo motor applies the total input force through the ball screw, and the force is transmitted to the lever and distributed to the three output ends in proportion.

[0030] The auxiliary system is connected to the monitoring system, and uses a high-precision data acquisition module to collect temperature data, sample deformation data and loading force data of each temperature control area in real time, and transmits the data to the monitoring system; When collecting temperature data of each temperature control area in real time, each temperature control area is equipped with an independent temperature sensor 10 such as a thermocouple or a thermistor. The temperature data of the temperature sensor is collected through a multi-channel ADC module to collect temperature signals. The multi-channel ADC module is installed on the outer side of the furnace body or in the electric control box, close to the exit position of the signal line of the temperature sensor 10, so as to reduce the signal transmission distance and external interference. The module is connected to the side frame of the furnace body through a fixed bracket or a mounting plate. The data acquisition frequency of the data acquisition module is set to 1 Hz or higher to capture subtle fluctuations in temperature and deformation data acquisition: When collecting the sample deformation data of each temperature control area in real time, a displacement sensor 12 such as an LVDT or an optical fiber displacement sensor is installed at the sample loading end of each test sample, and an independent displacement sensor 12 is arranged at each sample loading end; the displacement sensor 12 is fixed to the lower end of the loading rod or the side of the sample clamping device to ensure that the sensor can accurately measure the deformation amount of the sample during the loading process. According to the sample size, the position of the displacement sensor 12 is fine-tuned by an adjustable bracket to ensure that the sensor is aligned with the deformation direction of the sample, and the deformation of the sample is monitored in real time. The sample deformation data is transmitted to the central control system of the monitoring and control system through a high-speed acquisition interface, supporting a resolution of up to 0.01mm; When collecting the loading force data of each temperature control area in real time: the loading force of each sample is recorded by a stress sensor, and the clamping device 4 of each sample corresponds to a stress sensor 15. The stress sensor is installed at the connection between the loading rod and the sample clamping device to monitor the force value applied by the loading rod to the sample in real time. The end of the loading rod is also directly connected to a force sensor 11, which is fixed to the sample clamping device by threads or buckles to ensure that the force sensor can accurately measure the loading force in the vertical direction. The force sensor adopts a high-temperature resistant sensor structure and is installed at the bottom of the loading rod. It is isolated from the furnace cavity temperature zone by heat insulation materials to ensure the operation stability in a high-temperature environment; ensure real-time monitoring and feedback of the load, and the data accuracy is controlled within 0.1N. The signal of the force sensor 11 is led out through an anti-interference shielded line and connected to a data acquisition module installed on the outside of the furnace. The collected data is filtered and calibrated by an embedded processor; The embedded system combines the calibration algorithm to dynamically correct the collected data, eliminate sensor errors, and ensure that the accuracy is within ±0.1°C; and the data is synchronously processed and stored through the embedded control system.

[0031] The embedded control system and the data acquisition module are centrally installed in the electric control box 16, which is arranged at the lower part of the main body of the test machine and forms an integrated structure with the main body. The data acquisition module is arranged on the side frame of the multi-temperature furnace body and maintains a short distance connection with the embedded control system and the electric control box 16; The data acquisition module improves the reliability of test data through its built-in abnormality monitoring and alarm functions.

[0032] The central control system runs on an embedded processor, which uses a distributed architecture to coordinate the operation of multiple temperature zones, loading modules and data acquisition modules; The user sets the target temperature and loading parameters for each temperature zone through the human-computer interaction interface of the central control system, and views the temperature, deformation and load curves during the test in real time.

[0033] The method for using a creep testing machine with integrated multi-temperature control zones is provided. The creep testing machine forms multiple heating zones by partitioning its multi-temperature furnace. The heating zone is a temperature control zone, so as to simultaneously perform creep crack tensile tests at different temperatures. The device includes multiple temperature control execution modules, each temperature control execution module corresponds to a heating zone. The method for using the device includes the following steps: Step S1: construct a multi-temperature control zone creep test device, which includes multiple temperature control zones, each of which is equipped with an independent temperature adjustment unit, a temperature sensor and a loading module to achieve precise temperature control and loading of each temperature control zone; Step S2: Install different material samples in the sample fixtures of the clamping devices of each temperature control zone, set the target temperature of each temperature control zone, and apply a constant load to the sample through the loading module; Step S3: The temperature data, loading force data and sample deformation data of each temperature control area are collected in real time through the data acquisition module, and the data are systematically recorded through multi-channel data acquisition; the collected data are analyzed in real time by the data processing unit to ensure the stability of the temperature control area; Step S4: After the test is completed, the experimental data of different temperature control areas are summarized, a creep curve model of the material under multi-temperature conditions is established, the temperature-dependent creep behavior of the material is analyzed, and a long-term performance prediction of the material under multi-temperature conditions is generated.

[0034] In step S1, each temperature control area is composed of an independent heating device, a temperature sensor and a PID controller; in step S2, the loading module is driven by a servo motor, and the high temperature tensile CT tool 2 is controlled by a lever mechanism 17 to push the loading rod to apply a load to the sample; that is, the load is distributed to multiple temperature zones through the lever mechanism; in step S3, the data acquisition module includes a displacement sensor, a temperature sensor and a stress sensor, which are used to record the deformation, temperature and load respectively; Example: Reference Figure 1A creep testing machine with integrated multi-temperature control zones includes a basic structure of a DC bias power supply, a test host, a high-temperature component, a multi-temperature zone temperature control system, a test system, a loading and monitoring system, and an auxiliary system, wherein the test host includes: an electronic universal test host, the high-temperature component includes: a high-temperature CT stretching tool, a multi-temperature furnace with low temperature, medium temperature, high temperature, and a sample clamping device embedded in a multi-temperature zone control module, the multi-temperature zone temperature control system includes: a temperature control box and a temperature control system, a temperature sensor, and a temperature data acquisition module, the test system includes: a test control system and software, the loading and monitoring system includes: a force sensor, a displacement sensor, and an embedded control system, the auxiliary system includes: a multi-channel data acquisition module, an abnormal monitoring and alarm function, and creep crack tensile tests at different temperatures are performed simultaneously by partitioning the temperature furnace, the device communicates with multiple temperature control execution modules and a current transformer, and each temperature control execution module corresponds to a heating zone.

[0035] The high-precision creep fatigue crack growth tester is based on the test standard: GB / T 6398-2017 Metal material fatigue test fatigue crack growth method, the structure is as follows Figure 1 ; The multi-temperature furnace 3 is vertically divided into three parts, from left to right, there are 3 independent temperature control areas, namely, low temperature zone 5, medium temperature zone 6 and high temperature zone 7. Low temperature zone: designed as the left side of the furnace cavity, used for low temperature material testing, with a temperature control range of room temperature to 200°C. Medium temperature zone: located between the low temperature zone and the high temperature zone, with a temperature control range of 200°C to 600°C, as a transition zone. High temperature zone: designed as the far right side of the furnace cavity, suitable for high temperature testing, with a temperature control range of 600°C to above 1000°C.

[0036] Each temperature control area is vertically isolated using high-efficiency insulation materials such as ceramic fiberboard, aerogel board, etc. The thickness of the insulation material is designed to be 10-20 mm to ensure that the thermal interference between the temperature control areas is minimized. The insulation board 8 is fixed by the frame inside the furnace cavity, and a sealing structure is designed around the insulation board to reduce heat leakage. An insulation layer is arranged in each temperature control area, and the insulation layer has a low thermal conductivity to reduce thermal radiation and heat conduction.

[0037] Each temperature control area is equipped with an independent heating device 9 and a temperature sensor 10. The resistance wire is arranged around the sample to ensure heating uniformity. The heating device is fixed on the inner side of the insulation board and fixed by a high-temperature resistant bracket to avoid direct contact with the sample. At least 2-3 temperature monitoring points 14 are arranged in the center of the area and on the upper, lower and side surfaces of the wall to ensure accurate and uniform temperature measurement. The temperature sensor is connected to the embedded controller through the data acquisition module to feedback the temperature control data in real time. The signal line of the sensor adopts a high-temperature resistant shielded cable, which is led out through the cable hole on the furnace body and connected to the external data acquisition module.

[0038] The temperature of each temperature control area is adjusted with high precision through an adaptive PID control algorithm. The temperature control module is embedded in the outside of the furnace body, and the heating device and temperature sensor are connected by a high-temperature resistant cable. The temperature control module supports dynamic setting of the target temperature, and the adjustment range is flexibly configured according to the test requirements. The control circuit adopts a partitioned independent design to avoid interference and improve operational reliability. After the user enters the target temperature, the system automatically executes the adaptive PID control algorithm, dynamically adjusts the heating power according to the temperature deviation, quickly reaches the set temperature and stably controls it within ±0.1℃.

[0039] In this example, multiple independent clamping devices 4 are used to clamp the test samples. The devices are distributed vertically inside the furnace chamber and are located in the center of the low temperature 5, medium temperature 6 and high temperature 7 areas. Each clamping device 4 is fixed inside the furnace chamber by a high-strength heat-resistant bracket to ensure stability and accuracy. The clamping part of the sample is made of high-temperature resistant alloy materials such as nickel-chromium alloy to withstand mechanical stress in a high temperature environment. The sample clamping device can adjust the clamping force to adapt to the size and requirements of different materials or test samples. The clamping mechanism also has a fine-tuning function to ensure that the sample is accurately aligned with the force axis of the loading device. Each set of clamping devices corresponds to a temperature control area and is used to fix samples under different test conditions.

[0040] In this example, the loading module is driven by a servo motor 1, and a constant load is applied to each sample through a lever mechanism 17, which is connected to the loading rod through a sealed hole. The lever body is made of high-strength, low-deformation material. The surface of the lever body is often sprayed or electroplated to enhance corrosion resistance and wear resistance. The lever body is a frame structure with force input and output ends at both ends. The fulcrum is set in proportion to adjust the size of the input force and the output force. The total input force is applied 18, and the force is transmitted to the lever 19 and distributed proportionally to the two output ends 20. Assuming that the testing machine has three temperature control zones, it is required The three samples were loaded with 100N, 150N and 200N of loading force respectively. The position of the fulcrum was adjusted according to the target loading force ratio of 1:1.5:2. If the same force was to be applied to the three samples, the position of the fulcrum was evenly distributed. The servo motor applied the total input force through the ball screw, and the force was transmitted to the lever and distributed to the three output ends in proportion. The embedded control system monitored the actual force output of each force output end in real time. The lever mechanism 17 controlled the high temperature tensile CT tool 2 to push the loading rod through the lever to apply load to the sample. The force sensor detected the force value in real time and fed it back to the central controller. The central controller dynamically adjusted the motor output through a closed-loop control algorithm to ensure constant loading force.

[0041] In this example, a high-precision data acquisition module is used to collect temperature data, sample deformation data and loading force data of each temperature control area in real time. Each temperature control area is equipped with an independent temperature sensor 10 such as a thermocouple or thermistor. The temperature data is collected by collecting temperature signals through a multi-channel ADC module. The multi-channel ADC module is installed on the outer side of the furnace body or in the electrical control box, close to the exit position of the signal line of the temperature sensor 10 to reduce the signal transmission distance and external interference. The module is connected to the side frame of the furnace body through a fixed bracket or a mounting plate, and the data acquisition frequency is set to 1 Hz or higher to capture subtle temperature fluctuations.

[0042] Deformation data collection is specifically as follows: a displacement sensor 12 such as an LVDT or fiber optic displacement sensor is installed at each sample loading end, and an independent displacement sensor 12 is arranged at each sample loading end. The displacement sensor 12 is fixed at the lower end of the loading rod or the side of the sample clamping device to ensure that the sensor can accurately measure the deformation of the sample during loading. According to the sample size, the position of the displacement sensor 12 can be fine-tuned through an adjustable bracket to ensure that the sensor is aligned with the deformation direction of the sample. It is used to monitor the deformation of the sample in real time, and the data is transmitted to the central control system through a high-speed acquisition interface, supporting a resolution of up to 0.01mm.

[0043] The loading force data collection is as follows: the loading force of each sample is recorded by a stress sensor. Each sample clamping device 4 corresponds to a stress sensor 15, which is installed at the connection between the loading rod and the sample clamping device to monitor the force value applied by the loading rod to the sample in real time. The end of the loading rod is also directly connected to a force sensor 11, which is fixed to the sample clamping device by threads or buckles to ensure that the force sensor can accurately measure the loading force in the vertical direction. A high-temperature resistant sensor structure is used, which is installed at the bottom of the loading rod and isolated from the furnace cavity temperature zone by heat insulation materials to ensure the operation stability under high temperature environment. To ensure real-time monitoring and feedback of the load, the data accuracy is controlled within 0.1N. The signal of the force sensor 11 is led out through an anti-interference shielded line and connected to the data acquisition module installed on the outside of the furnace. The collected data is filtered and calibrated by an embedded processor. The embedded system combines the calibration algorithm to dynamically correct the collected data, eliminate sensor errors, and ensure that the accuracy is within ±0.1℃. The data is synchronously processed and stored through an embedded control system.

[0044] The embedded control system and the data acquisition module are centrally installed in the electric control box 16, which is arranged at the lower part of the main body and integrated with the main body. The data acquisition module is arranged on the side frame of the furnace body and maintains a short distance connection with the embedded control system and the electric control box 16. The data acquisition module supports abnormal monitoring and alarm functions, further improving the reliability of the test data.

[0045] The central control system is designed based on an embedded processor and uses a distributed architecture to coordinate the operation of multiple temperature zones, loading modules and data acquisition modules. The control system supports users to set the target temperature and loading parameters of each temperature zone through the human-computer interaction interface, and displays the temperature, deformation and load curves during the test in real time.

Claims

1. A creep testing machine with integrated multi-temperature control zones, characterized in that: The test area of ​​the test machine is divided into a plurality of independent temperature control areas by high-efficiency heat-insulating materials. Each temperature control area is connected to the same servo motor via a high-precision lever mechanism (17). The high-precision lever mechanism comprises a plurality of levers (19). One end of each lever is connected to a screw rod at a power output end of the servo motor via an adjustable fulcrum. The other end of the lever outputs the loading force required for the temperature control zone test process to each temperature control area via a force distribution output end, so as to achieve dynamic distribution of the servo motor output force by adjusting the fulcrum position, thereby meeting the requirements of different test conditions in different temperature control areas.

2. The creep testing machine with integrated multi-temperature control zones according to claim 1, characterized in that: The test machine includes a high temperature component, a multi-temperature zone temperature control system, a test system, a loading system, a monitoring system, and an auxiliary system; The high temperature components include: a high temperature CT stretching tool, a multi-temperature furnace embedded with a multi-temperature zone control module, and a sample clamping bracket for fixing the test sample; The sample clamping bracket is connected to the force output end of the lever; The multi-temperature zone temperature control system includes: temperature control box and temperature control system, temperature sensor, temperature data acquisition module; The test system includes: test control system and software; The loading system includes: force sensor, displacement sensor; The monitoring system includes an embedded control system; The auxiliary system includes: multi-channel data acquisition module, abnormal monitoring and alarm function module.

3. The creep testing machine with integrated multi-temperature control zones according to claim 2, characterized in that: The experimental area of ​​the test machine is arranged in the furnace cavity of the multi-temperature furnace, and the furnace cavity is divided into three independent temperature control areas: a low temperature area (5), a medium temperature area and a high temperature area (7) by vertical insulation boards; Low temperature zone: designed as the left side of the furnace chamber, used for low temperature material testing, with a temperature control range of room temperature to 200°C; High temperature zone: designed as the far right of the furnace chamber, suitable for high temperature tests, with a temperature control range of 600°C to over 1000°C; Medium temperature zone: located between the low temperature zone and the high temperature zone, with a temperature control range of 200°C to 600°C, serving as a transition zone; each temperature control zone is vertically isolated using a heat insulation board (8) made of a high-efficiency heat insulation material; The temperature control system includes an independent heating device (9) and a temperature sensor (10) provided in each temperature control area; the resistance wire of the heating device is arranged around the sample to ensure uniform heating of the sample; the heating device is fixed on the inner side of the heat insulation board and fixed by a high temperature resistant bracket to avoid direct contact with the sample; The heat insulation board (8) is fixed by a frame inside the multi-temperature furnace cavity, a sealing structure for reducing heat leakage is arranged around the heat insulation board, and a heat insulation layer is arranged in each temperature control area, and the heat insulation layer is formed of a material with a low thermal conductivity coefficient to reduce heat radiation and heat conduction; The testing machine uses a plurality of independent clamping devices (4) to clamp the sample, and each clamping device is distributed along the vertical direction inside the furnace chamber and is located at the center of the low temperature (5), medium temperature (6) and high temperature (7) areas respectively; Each clamping device (4) is fixed inside the multi-temperature furnace cavity by a high-strength heat-resistant bracket to ensure stability and accuracy; The clamping part of the sample is made of high temperature resistant alloy material to withstand the mechanical stress in high temperature environment; The sample clamping device can adapt to the test requirements of different test samples by adjusting the clamping force; The sample clamping device uses the fine-tuning function to ensure that the sample and the force axis of the loading device are accurately aligned. Each set of clamping devices corresponds to a temperature control area and is used to fix samples under different test conditions. The loading module is driven by a servo motor (1), which applies the load required for the test to each test sample through a lever mechanism (17), and the force component output end of the lever of the lever mechanism is connected to the loading rod of the sample clamping device through a sealing hole.

4. The creep testing machine with integrated multi-temperature control zones according to claim 3, characterized in that: The temperature data acquisition module arranges a plurality of temperature monitoring points (14) at the center of each temperature control area and on the top, bottom and side of the wall to ensure accurate and uniform temperature measurement. The temperature sensor is connected to the embedded controller through the data acquisition module to feedback temperature control data in real time. The signal line of the sensor adopts high temperature resistant shielded cable, which is led out through the cable hole of the multi-temperature furnace body and connected to the external data acquisition module; The temperature of each temperature control area is adjusted with high precision through the adaptive PID control algorithm. The temperature control module of the temperature control system is embedded on the outside of the multi-temperature furnace body. The heating device and the temperature sensor are connected through high-temperature resistant cables. The temperature control module can dynamically set the target temperature, and the adjustment range can be configured according to the test requirements. The control circuit adopts a partitioned independent design to avoid interference and improve operational reliability. After the user inputs the target temperature during the test, the temperature control system automatically executes the adaptive PID control algorithm and dynamically adjusts the heating power according to the temperature deviation, so that the temperature of each temperature control area quickly reaches the set temperature and stabilizes.

5. The creep testing machine with integrated multi-temperature control zones according to claim 3, characterized in that: The main body of the lever is made of high-strength, low-deformation material; The main body of the lever is a frame structure, and the upper end and the lower end of the frame structure are respectively a force input end and an output end; The two end fulcrums of each lever are respectively arranged at the screw rod at the force input end and the force output end, and the fulcrums are arranged at the screw rod (18) in a proportional manner and are laterally distributed at the screw rod to adjust the magnitude of the input force and the output force; During the test, the servo motor applies a total input force via the screw (18), and the total input force is transmitted to the lever (19) and distributed to the corresponding lever force component output end (20) in proportion to the position of the lever fulcrum; if the same force is to be applied to each sample, the position of the fulcrum is evenly distributed.

6. The creep testing machine with integrated multi-temperature control zones according to claim 3, characterized in that: The auxiliary system is connected to the monitoring system, and uses a high-precision data acquisition module to collect temperature data, sample deformation data and loading force data of each temperature control area in real time, and transmits the data to the monitoring system; When collecting temperature data of each temperature control area in real time, each temperature control area is equipped with an independent temperature sensor (10). The temperature data of the temperature sensor is collected through a multi-channel ADC module to collect temperature signals. The multi-channel ADC module is installed on the outer side of the furnace body or in the electric control box, close to the exit position of the signal line of the temperature sensor (10) to reduce the signal transmission distance and external interference. The module is connected to the side frame of the furnace body through a fixed bracket or a mounting plate. The data acquisition frequency of the data acquisition module is set to 1 Hz or higher to capture subtle fluctuations in temperature and deformation data acquisition: When collecting the sample deformation data of each temperature control area in real time, the displacement sensor (12) is installed at the sample loading end of each test sample, and an independent displacement sensor (12) is arranged at each sample loading end; the displacement sensor (12) is fixed to the lower end of the loading rod or the side of the sample clamping device to ensure that the sensor can accurately measure the deformation amount of the sample during the loading process. According to the size of the sample, the position of the displacement sensor (12) is fine-tuned by an adjustable bracket to ensure that the sensor is aligned with the deformation direction of the sample, and the deformation of the sample is monitored in real time. The sample deformation data is transmitted to the central control system of the monitoring and control system through a high-speed acquisition interface; When collecting the loading force data of each temperature control area in real time: the loading force of each sample is recorded by a stress sensor, and each sample clamping device (4) corresponds to a stress sensor (15). The stress sensor is installed at the connection between the loading rod and the sample clamping device to monitor the force value applied by the loading rod to the sample in real time. The end of the loading rod is also directly connected to a force sensor (11), which is fixed to the sample clamping device by a thread or a buckle to ensure that the force sensor can accurately measure the loading force in the vertical direction. The force sensor adopts a high-temperature resistant sensor structure and is installed at the bottom of the loading rod. It is isolated from the furnace cavity temperature zone by a heat insulation material to ensure the operation stability in a high-temperature environment; to ensure real-time monitoring and feedback of the load, the signal of the force sensor (11) is led out through an anti-interference shielded line and connected to a data acquisition module installed outside the furnace, and the collected data is filtered and calibrated by an embedded processor; The embedded system combines the calibration algorithm to dynamically correct the collected data to eliminate sensor errors; and the embedded control system synchronously processes and stores the data.

7. The creep testing machine with integrated multi-temperature control zones according to claim 6, characterized in that: The embedded control system and the data acquisition module are centrally installed in an electric control box (16). The electric control box (16) is arranged at the lower part of the main body of the testing machine and forms an integrated structure with the main body. The data acquisition module is arranged on the side frame of the multi-temperature furnace body and maintains a short-distance connection with the embedded control system and the electric control box (16). The data acquisition module improves the reliability of test data through its built-in abnormality monitoring and alarm functions.

8. The creep testing machine with integrated multi-temperature control zones according to claim 6, characterized in that: The central control system runs on an embedded processor, which uses a distributed architecture to coordinate the operation of multiple temperature zones, loading modules and data acquisition modules; The user sets the target temperature and loading parameters for each temperature zone through the human-computer interaction interface of the central control system, and views the temperature, deformation and load curves during the test in real time.

9. The method for using the creep testing machine with integrated multi-temperature control zones is characterized by: The creep testing machine forms multiple heating zones by partitioning its multi-temperature furnace, and the heating zone is a temperature control zone, so as to simultaneously perform creep crack tensile tests at different temperatures. The equipment includes multiple temperature control execution modules, each temperature control execution module corresponds to a heating zone, and the use method includes the following steps: Step S1: construct a multi-temperature control zone creep test device, which includes multiple temperature control zones, each of which is equipped with an independent temperature adjustment unit, a temperature sensor and a loading module to achieve precise temperature control and loading of each temperature control zone; Step S2: Install different material samples in the sample fixtures of the clamping devices of each temperature control zone, set the target temperature of each temperature control zone, and apply a constant load to the sample through the loading module; Step S3: The temperature data, loading force data and sample deformation data of each temperature control area are collected in real time through the data acquisition module, and the data are systematically recorded through multi-channel data acquisition; the collected data are analyzed in real time by the data processing unit to ensure the stability of the temperature control area; Step S4: After the test is completed, the experimental data of different temperature control areas are summarized, a creep curve model of the material under multi-temperature conditions is established, the temperature-dependent creep behavior of the material is analyzed, and a long-term performance prediction of the material under multi-temperature conditions is generated.

10. The method for using the creep testing machine with integrated multi-temperature control zones according to claim 9, characterized in that: In step S1, each temperature control area is composed of an independent heating device, a temperature sensor and a PID controller; in step S2, the loading module is driven by a servo motor, and the high temperature tensile CT tool (2) is controlled by a lever mechanism (17) to push the loading rod to apply a load to the sample; that is, the load is distributed to multiple temperature zones through the lever mechanism; in step S3, the data acquisition module includes a displacement sensor, a temperature sensor and a stress sensor, which are used to record deformation, temperature and load respectively; The control system of the creep testing machine uses an embedded processor to adjust the temperature control module in real time and coordinate the operation of each module. The embedded control system monitors the actual output of each force output end in real time through a force sensor. The force sensor detects the loading force value of the sample in real time and feeds it back to the central controller of the monitoring system; the central controller dynamically adjusts the output force of the servo motor through a closed-loop control algorithm to ensure constant loading force.

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