Contact-type heating high-temperature tensile test system for plates and measuring method of contact-type heating high-temperature tensile test system

Abstract

The invention relates to a contact type heating high-temperature tensile test system suitable for plates in the technical field of material high-temperature mechanical property testing, and the system comprises a loading module which is used for being connected with a testing machine and cooperating with a clamping module to apply an acting force to a sample so as to realize a tensile process; a heating block of the heating module is controlled by an air cylinder with a free stroke to move so as to be tightly attached to the sample for heating, and a window for observing the sample is formed in the external heat preservation box; according to the device, a contact type heating mode is adopted to achieve heating of a sample piece, the heating speed is high, the sample is heated evenly, the sample can rotate by 90 degrees, heating and strain measurement are achieved respectively, laser temperature measurement and the heating rod are coupled through the temperature controller, accurate control over the temperature is achieved, and the device is simple in structure, convenient to operate and high in practicability. The high-temperature area and the normal-temperature area are separated by a thermal insulation material, and the high-temperature area adopts clearance fit to ensure sufficient thermal expansion space of the pin, so that high-temperature adhesion is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of high-temperature mechanical property testing of materials, and particularly relates to a tensile testing device for plate samples in a high-temperature environment. Background Art

[0002] High-temperature tensile testing of materials comprehensively evaluates a material's mechanical properties and deformation behavior under high-temperature conditions by measuring its tensile strength, yield strength, ductility, and creep properties. This test not only provides a crucial basis for material design optimization and process improvement, but also verifies theoretical models of high-temperature mechanics and supports the accuracy of numerical simulations. Furthermore, it helps predict the service life of materials in high-temperature environments, ensuring the safety and reliability of equipment and structures, and providing critical data support for material selection and application in high-temperature fields such as aerospace, energy, and chemical engineering.

[0003] Many engineering materials exist in the form of plates in practical applications. Plate specimens can be prepared directly from these plates, and their microstructure and properties are representative of the material in actual use. Plate specimen grips apply tensile force evenly, preventing stress concentration at the gripping point that can lead to test failure.

[0004] Currently, high-temperature tensile tests are primarily conducted using high-temperature furnaces, but these furnaces are slow, resulting in low test efficiency. Other heating methods, such as resistance heating, are limited by specimen shape and conductivity, while induction heating is limited by uneven heating. Existing devices and heating methods cannot simultaneously meet the requirements of high heating efficiency and uniform temperature distribution for high-temperature tensile tests. Therefore, a test device is urgently needed that can conduct high-temperature tensile tests with both high heating efficiency and uniform temperature distribution, while also providing accurate data measurement.

[0005] Currently, the deformation measurement of specimens mainly adopts the contact measurement method, including tools such as extensometers, strain gauges, and eddy current sensors. In high-temperature deformation measurement, since the contact measurement tool must be in contact with the test piece, the temperature of the measurement tool itself will continue to rise, causing the deformation measurement error to increase and may cause damage or even destruction to the measurement tool. Therefore, it is impossible to accurately obtain the deformation and strain data of the test piece. For this reason, we propose a contact heating high-temperature tensile test system and its measurement method for plate. Summary of the Invention

[0006] In response to the above problems, the present invention provides a contact heating high-temperature tensile testing system for plate materials and a measurement method thereof, which can efficiently complete high-temperature tensile tests on plate specimens of various materials and obtain accurate test data. The device adopts contact heating for heating, and uses a temperature controller with an infrared laser temperature measuring head to monitor the temperature in real time and control the power of the heating rod to adjust the temperature. The strain measurement system adopts non-contact measurement equipment for measurement, which can efficiently complete high-temperature tensile tests on plate specimens.

[0007] The technical solution of the present invention is:

[0008] The designed system includes a loading module, a clamping module, a heating module, a fixing module, a temperature control module, and a measurement module. The plate specimen is fixed by the clamping module and connected to the loading modules at the top and bottom. The loading module is connected to the crossbar of the testing machine to apply force. The left and right ends are heating modules, part of which is connected to the fixing module. The movement of the heating block is controlled by a cylinder with free travel. The heating block contains a heating rod to heat the specimen. An insulating box is arranged outside, with a window filled with quartz glass for observing the specimen. The fixing module is installed on the universal testing machine and serves as the base for the entire device. The temperature control module is a temperature controller. The measurement module consists of an infrared laser temperature probe and an image acquisition and processing mechanism. The temperature probe measures the surface temperature of the specimen and outputs it to the temperature controller. The image capture and processing mechanism captures and records continuous images of the specimen during stretching and processes them to obtain deformation and strain information. The plate specimen and the clamping module, the clamping module and the loading module, and the heating module and the fixing module are all connected using a six-degree-of-freedom constraint structure. The joints are all clearance-fit, leaving allowance for thermal expansion. The invention solves the problems of slow heating rate, uneven heating and inaccurate strain measurement during high-temperature stretching of existing plate-shaped specimens.

[0009] A further technical solution of the present invention is: the system further includes:

[0010] The air pump is located on the left side of the testing machine and provides power to the cylinder;

[0011] Spotlight, placed on a tripod, provides fill light during measurement and collection;

[0012] A computer, connected to the stretching machine and the industrial camera, is used to process experimental data.

[0013] A further technical solution of the present invention is: the loading module includes a connector connected to the testing machine by a pin, a cylindrical alumina ceramic used for heat insulation to prevent the equipment from being damaged by heat, and a tray with a groove in the middle that supports the clamping module. The three are connected by six pins evenly distributed on the circumference, and are symmetrically distributed up and down as a whole, and are used to connect to the testing machine to apply force to the sample.

[0014] A further technical solution of the present invention is that the clamping modules are symmetrically distributed up and down, and are cylindrical clamping devices with rotating rods, with a gap in the middle and threaded holes on the sides for placing and clamping the sample. At the same time, threaded holes are opened on the surface of the large cylindrical platform at the end for the installation of the rotating rod, and the rotation angle control mechanism includes a button Calculate the formed guide groove, where is the guide groove angle, is the additional offset angle due to the existence of the rotation rod, b is the rotation rod radius, and r is the rotation radius of the upper end of the fixture. The tolerance is controlled within the range of ±0.5° to accurately achieve 90° rotation of the specimen:

[0015] A further technical solution of the present invention is: the heating module is distributed symmetrically on the left and right, and consists of a small cylinder with free stroke, a heating block connected to the top of the cylinder, and an external insulation box. The cylinder is powered by an air pump, and the free movement and stop of the top are controlled by a manual control valve. The heating block is specifically divided into three components. The first layer is a connecting block connected to the cylinder, the second layer is an insulation board that blocks heat transfer, and the third layer is hot working die steel on which the heating rod can be placed. The insulation box is fixed between the mounting frames on both sides. The box body includes an internal hollow shell and an insulation cotton filling layer. The box door is provided with an observation window, and the window is made of quartz glass to ensure light transmittance and heat insulation.

[0016] A further technical solution of the present invention is: the fixing module is a steel plate and a mounting frame of a specific shape and size. The steel plate is placed on an existing tensile testing machine. The designed shape and size match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting frame is symmetrically distributed on the left and right and is used to install a fixed cylinder and an insulation box.

[0017] A further technical solution of the present invention is: the measurement module consists of a spotlight, an industrial camera, an infrared laser temperature measuring head and a tripod support frame, the tripod support frame can be adjusted in height, the platform on which the camera and spotlight are installed can also be adjusted in height, the spotlight can also be adjusted in tilt angle, and the infrared laser temperature measuring head is installed on a designed specific bracket, which can adjust the height and tilt angle.

[0018] A further technical solution of the present invention is: the industrial camera continuously captures images during the sample stretching process, and the sample must be evenly sprayed with speckles as required before stretching. After the captured images are obtained, they are post-processed with computer program software to obtain the strain data of the sample.

[0019] The contact heating high temperature tensile testing device for plates is a system for measuring the high temperature tensile properties of materials, and the specific steps are as follows:

[0020] Install the device on the testing machine and connect the upper and lower loading modules with the loading part of the testing machine through pins;

[0021] Step 2: Place the heating rod, laser temperature measuring head, industrial camera, air pump and temperature controller, and connect the relevant interfaces;

[0022] Step 3: Open the door of the incubator and adjust the rotating rod so that the groove of the clamping module is parallel to the front view surface;

[0023] Step 4: Place both ends of the polished and speckled plate specimen into the grooves and secure them with screws.

[0024] Step 5: Turn the clamping module to rotate the sample 90°, operate the cylinder to move the heating block close to the plate sample, and close the insulation box door;

[0025] Step 6: Start the heating rod in the temperature controller to start heating, and adjust the position of the laser temperature measuring head so that the temperature of the middle sample can be measured;

[0026] Step 7: When the temperature controller displays that the temperature reaches the target temperature, control the cylinder to adjust the heating block away from the sample so that the sample can be rotated 90°;

[0027] Step 8: When the sample is facing the tester, the heating blocks are on both sides of the sample, the laser temperature measuring head continues to measure the temperature, and the temperature controller controls the power of the heating rod to maintain the temperature;

[0028] Step 9: After the temperature stabilizes, turn on the spotlight, adjust the camera position, and start the test machine for testing;

[0029] Step 10: After the test, turn off the temperature controller, open the box door to dissipate heat, and save the data.

[0030] The beneficial effects of the present invention are as follows: the present invention uses contact heating to achieve sample temperature increase, with a fast heating rate and uniform heating of the sample. The sample can be rotated 90 degrees to achieve heating and strain measurement respectively. The temperature controller couples the laser temperature measurement and the heating rod to achieve precise temperature control. The high-temperature zone and the normal temperature zone are separated by thermal insulation material. The high-temperature zone adopts a clearance fit to ensure sufficient space for the pins to expand thermally, thereby preventing high-temperature adhesion. The specific advantages are analyzed as follows:

[0031] 1. Plate specimens can be used for high-temperature mechanical property testing of a variety of materials with high efficiency and accurate measurement.

[0032] 2. The specimen can be accurately positioned in the fixture during installation. The fixture is simple and quick to operate, making it easy for manual installation and disassembly.

[0033] 3. The 90° rotation of the fixture can realize the position change of the front and side of the sample, which is convenient for heating and image shooting.

[0034] 4. Each part of the device is made of different materials according to its function. For example, the clamping part is made of mold steel commonly used in hot stamping, which has sufficient rigidity, stability and heat resistance. The thermal insulation material is alumina ceramic to ensure sufficient heat isolation. The service life of each part can be guaranteed.

[0035] 5. The test temperature is controlled by coupling an infrared laser temperature measuring head, a heating rod and a temperature controller, and an insulation box is arranged outside to achieve precise temperature control and temperature stability during the experiment.

[0036] 6. Strain measurement is carried out using non-contact measuring equipment, which has the advantages of full-field measurement and high precision, and can provide detailed displacement and strain information. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 The figure is a schematic structural diagram of a contact heating high temperature tensile test system for plate;

[0038] Figure 2 This is a schematic diagram of the heating state of the test fixture of a specific embodiment of the present invention;

[0039] Figure 3 This is a schematic diagram of the test fixture measurement state of a specific embodiment of the present invention;

[0040] Figure 4 This is a schematic diagram of a test fixture loading module according to a specific embodiment of the present invention;

[0041] Figure 5 A schematic diagram of a test fixture clamping module according to a specific embodiment of the present invention;

[0042] Figure 6 This is a schematic diagram of a heating module for a test fixture according to a specific embodiment of the present invention;

[0043] Figure 7 This is a schematic diagram of a test fixture fixing module according to a specific embodiment of the present invention;

[0044] Figure 8 Schematic diagram of a test fixture measurement module according to a specific embodiment of the present invention.

[0045] Description of reference numerals:

[0046] 1-Loading module; 2-Clamping module; 3-Heating module; 4-Fixed module; 5-Testing machine;

[0047] 6- measurement module; 7- temperature control module; 8- air pump;

[0048] 11-testing machine connector; 12-round insulation block; 13-tray;

[0049] 21-rotating rod; 22-cylindrical fixture;

[0050] 31-cylinder; 32-heating block; 33-insulation box;

[0051] 320-die steel body; 321-square heat insulation block; 322-cylinder connector;

[0052] 41-fixed bracket; 42-fixed base;

[0053] 61-spotlight; 62-industrial camera; 63-infrared laser temperature measuring head; 64-triangular support frame. DETAILED DESCRIPTION

[0054] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0055] Example:

[0056] like Figures 1-8 As shown, this embodiment provides a contact heating high-temperature tensile testing system for a plate, comprising:

[0057] The loading module 1 is connected to the testing machine 5 and cooperates with the clamping module 2 to apply force to the sample to achieve the stretching process;

[0058] The heating module 3 is controlled by a cylinder 31 with free stroke to move the heating block 32 to close to the sample for heating. The external heat preservation box 33 has a window for observing the sample.

[0059] The fixed module 4, serving as the base and support of the entire device, is mounted on the testing machine 5;

[0060] The temperature control module 7 is connected to the heating block and the temperature measuring device, and adjusts the heating power through signal feedback to achieve precise control of the sample temperature;

[0061] The measuring module 6 is mounted on a tripod 64 and measures the surface temperature of the sample and captures continuous deformation images of the sample during the stretching process, and processes the images to obtain strain information. The measuring module 6 comprises an image acquisition mechanism and an image processing mechanism. The acquisition mechanism is mounted on the tripod, and the acquisition port is aligned with the parallel section of the sample through the observation window to acquire deformation and strain information of the parallel section of the sample during the stretching process. The image processing mechanism is a professional software program that converts the continuous deformation images obtained by the acquisition mechanism into digital deformation and strain information.

[0062] Specifically, in this embodiment, the fixing module 4 is a steel plate 42 of a specific shape and size and a mounting frame 41. The steel plate is placed on the existing tensile testing machine. The designed shape and size match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting frame is symmetrically distributed on the left and right and is used to install the fixed cylinder 31 and the insulation box 33. The air pump 8 is arranged on the left side of the testing machine 5 to provide power for the cylinder 31. The fixing module can be made of thick steel plate with a higher density to ensure stability; the heating block where the heating rod is located can be made of mold steel commonly used in hot stamping molds, and the thermal insulation material can be alumina ceramics. The cylinder selection stroke is 15 to 75 The standard SC cylinder (mm) uses a standard air pipe to connect the air inlet to the control valve and air pump. The air pump insulation box can be made of high-quality stainless steel and equipped with a sandwich layer to accommodate insulation cotton. The observation window is a square hole made of high-transmittance quartz optical glass to ensure good light transmittance. The clamping module is made of hot-working die steel, and the loading module is made of cold-working die steel. The infrared laser camera can measure temperatures within a range of 20 to 1000°C and can output signals in the form of RS485 for connection to temperature controllers that can accept such signals. The industrial camera should be a high-resolution model, connected to the image processing unit via a signal channel to achieve data transmission. The image processing unit uses professional computer software.

[0063] In one embodiment, the imaging quality may be affected due to differences in ambient light, so a spotlight is additionally provided for supplementary lighting to provide a guarantee for ambient brightness and ensure that the image acquisition mechanism captures images of high quality.

[0064] In one embodiment, the support frame for mounting the industrial camera adopts a common tripod and has a lifting mechanism to achieve free adjustment of the height to ensure that the imaging port is opposite to the sample in the observation window. The spotlight is installed behind the camera and the tilt angle can be adjusted. The infrared laser temperature measuring head is installed below the camera and placed on a bracket with adjustable height and tilt angle.

[0065] In one embodiment, the sample is placed between two cylindrical clamps and clamped with screws. The side of the sample is first facing the tester. The cylinder is controlled to move the heating block so that the heating block fits the sample and heating is started. The heating rod uses a customized heating rod with a temperature range of 25 to 1000°C. The temperature is measured by an infrared temperature measuring head and displayed on the temperature controller display. After reaching the specified temperature, the cylinder is controlled to move the heating block principle to the sample so that the sample can be rotated to face the tester. The heating is fast and radiant heating is provided on both sides. At the same time, the temperature is observed. If the sample temperature drops, the power of the heating rod is increased so that the surface temperature of the sample can be maintained at the target temperature.

[0066] In one embodiment, the loading module 1 includes a connector 11 connected to the testing machine by a pin, a cylindrical alumina ceramic 12 for heat insulation to prevent the equipment from being damaged by heat, and a tray 13 with a groove in the middle to support the clamping module. The three are connected by six pins evenly distributed on the circumference, and are symmetrically distributed up and down as a whole, and are used to connect to the testing machine to apply force to the sample.

[0067] In one embodiment, the clamping module 2 is symmetrically distributed up and down, and is a cylindrical clamping device 22 with a rotating rod 21. There is a gap in the middle and threaded holes on the side to place and clamp the sample. At the same time, the surface of the large cylindrical table at the end is provided with a threaded hole for the rotating rod to be installed. The angle of the groove opening on the tray is matched with the angle of the tray in the loading module. The angle of the groove opening on the tray is calculated according to the following formula to accurately achieve a 90° rotation of the sample:

[0068]

[0069] In one embodiment, the heating module 3 is symmetrically distributed on the left and right, and consists of a small cylinder 31 with a free stroke, a heating block 32 connected to the top of the cylinder, and an external insulation box 33. The cylinder is powered by an air pump 8, and the free movement and stop of the top are controlled by a manual control valve 9. The heating block is specifically divided into three components. The first layer is a connecting block connected to the cylinder, the second layer is an insulation board that blocks heat transfer, and the third layer is a hot working die steel on which a heating rod can be placed. The insulation box is fixed between the mounting frames 41 on both sides. The box body includes an internal hollow shell and an insulation cotton filling layer. The box door is provided with an observation window, and the window is made of quartz glass to ensure light transmittance and heat insulation.

[0070] In one embodiment, the fixing module 4 is a steel plate 42 of a specific shape and size and a mounting frame 41. The steel plate is placed on an existing tensile testing machine. The designed shape and size match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting frame is symmetrically distributed on the left and right and is used to install the fixed cylinder 31 and the insulation box 33.

[0071] In one embodiment, the measuring module 6 is composed of a spotlight 61, an industrial camera 62, an infrared laser temperature measuring head 63 and a tripod support frame 64. The tripod support frame can be adjusted in height, the platform on which the camera and the spotlight are installed can also be adjusted in height, the spotlight can also be adjusted in tilt angle, and the infrared laser temperature measuring head is installed on a specially designed bracket, which can adjust the height and tilt angle.

[0072] In one embodiment, the surface of the sample should be polished first to ensure a smooth surface, and then evenly sprayed with speckle treatment. Based on the changes in the speckle shape of multiple consecutive images, professional software programs are used to obtain the deformation strain information of the sample and ensure measurement accuracy.

[0073] This embodiment also provides a specific testing process, including:

[0074] According to the set positioning reference, fix the fixed base on the central platform of the tensile testing machine. After ensuring that it is stable, use screws to fix the mounting bracket to the base, which is symmetrically distributed on the left and right; take out the cylinder, air pump, hose and manual control valve, use the hose to connect the cylinder to the air pump through the manual control valve, and fix the cylinder in the center of the mounting bracket after adjusting the position; vertically pass the clamping module through the round tray in the loading module, use screws to connect it with the other two components of the loading module in order, rotate the clamping module so that the preset threaded hole appears in the field of view, take out the threaded rotating rod for installation, and then use pins to fix the loading module to the upper and lower mounting cylinders of the testing machine respectively, which are symmetrically distributed up and down; first, put the insulation box body Pass the bottom through the clamping fixture and place it on the lower component. Adjust the position and use screws to connect the left and right sides of the heating box to the mounting brackets to fix them, and open the insulation box door; connect the three components of the heating block in order with screws, adjust the cylinder telescopic rod to extend it into the insulation box, and then install the heating block on the telescopic rod; take out the heating rod and place it in the preset circular hole of the heating block. The connecting wire of the heating rod passes through the preset hole in the lower left corner of the insulation box and is connected to the temperature controller and power supply; install the infrared laser temperature measuring head, industrial camera, and spotlight on the tripod bracket with screws, adjust the position so that it can face the center space of the insulation box, connect the infrared laser temperature measuring head cable to the temperature controller, and complete the overall system installation operation.

[0075] After the overall installation of the system is completed, the tensile specimen is taken out and the speckle pattern is produced. The specific operation is to polish the specimen first, remove burrs and flash, ensure that the surface of the specimen is smooth, and then spray white primer first. The primer is required to be resistant to high temperature and not easy to fall off. Then evenly spray black primer, which is also required to be resistant to high temperature and not easy to fall off. After spraying, wait for the primer to stand and solidify before placing the specimen in the clamping fixture, and then fix it with screws to ensure that the stretching process remains stable. Adjust the position of the fixture by turning the rod up and down so that the sprayed surface of the specimen is parallel to the left and right heating blocks, and operate the manual control valve to control the cylinder so that the heating block is close to the specimen. Close the insulation box door, open the temperature controller, and adjust the position of the infrared laser temperature measuring head so that the surface temperature of the middle specimen can be measured and displayed on the temperature controller. Turn on the power of the heating rod, operate the temperature controller to control the power of the heating rod to start heating the specimen. After the temperature displayed on the instrument reaches the preset target temperature, operate the manual control valve to move the heating block away from the specimen, and operate the rotating rod to make the specimen The sample is rotated 90°, with the painted surface facing the experimenter. The temperature is continued to be monitored by the temperature measuring head. If the surface temperature of the sample drops due to the distance of the heating block, the power of the heating rod is increased through the temperature controller so that the heating blocks on both sides heat the sample through radiation and the temperature of the sample can be increased and maintained. After the temperature display of the temperature measuring head is stable, the spotlight is turned on so that it can illuminate the surface of the sample. The position, focal length, aperture and other parameters of the industrial camera are adjusted so that a clear image of the sample surface can be displayed. After the image is clearly displayed, the stretching machine is started for the experiment. The stretching machine's built-in beam drives the upper clamp to stretch the sample upward through the connector. The industrial camera continuously collects the changing image of the sample speckle and transmits it to the computer through the connection line for storage for processing and analysis by the software program. When the sample is broken, the testing machine stops according to the set steps, the box door is opened to dissipate the sample heat, and the software program processes the data to obtain the deformation strain information of the sample during this stretching process.

[0076] The above embodiments merely represent specific implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A contact heating high temperature tensile test system suitable for plate materials, characterized in that: The system comprises: The loading module (1) is used to connect with the testing machine (5) and cooperate with the clamping module (2) to apply force to the sample to realize the stretching process; The heating module (3) is controlled by a cylinder (31) with free stroke to move a heating block (32) so as to be close to the sample for heating. The external heat preservation box (33) is provided with a window for observing the sample. The fixed module (4), serving as the base and support of the entire device, is mounted on the testing machine (5); The temperature control module (7) is connected to the heating block and the temperature measuring device, and adjusts the heating power through signal feedback to achieve precise control of the sample temperature; The measuring module (6) is mounted on a tripod (64) to measure the surface temperature of the sample and to capture continuous deformation images of the sample during stretching, and to process the images to obtain strain information.

2. A contact heating high temperature tensile testing system for plates according to claim 1, characterized in that: The system further comprises: An air pump (8) is arranged on the left side of the testing machine (5) and provides power to the cylinder (31); The spotlight (61) is arranged on a tripod and provides supplementary light during the measurement and collection process.

3. A contact heating high temperature tensile testing system for plates according to claim 1, characterized in that: The loading module (1) comprises a connector (11) connected to the testing machine via a pin, a cylindrical alumina ceramic (12) for heat insulation to prevent the equipment from being damaged by heat, and a tray (13) with a groove in the middle for supporting the clamping module. The three are connected by six pins evenly distributed on the circumference, and are symmetrically distributed in the upper and lower parts as a whole, and are used to connect to the testing machine to apply force to the sample.

4. A contact heating high temperature tensile testing system for plates according to claim 1, characterized in that: The clamping module (2) is symmetrically distributed up and down, and is a cylindrical clamping device (22) matched with a rotating rod (21), with a gap in the middle and threaded holes on the side for placing and clamping the sample. At the same time, a threaded hole is opened on the surface of the large cylindrical platform at the end for the installation of the rotating rod.

5. The contact heating high temperature tensile testing system for plate materials according to claim 1, characterized in that: The heating module (3) is symmetrically distributed on both sides and consists of a small cylinder (31) with free stroke, a heating block (32) connected to the top of the cylinder, and an external insulation box (33). The cylinder is powered by an air pump (8), and the free movement and stop of the top is controlled by a manual control valve (9). The heating block is specifically divided into three parts. The first layer is a connecting block connected to the cylinder, the second layer is an insulation board that blocks heat transfer, and the third layer is hot working die steel that can place the heating rod. The insulation box is fixed between the mounting frames (41) on both sides. The box body includes an internal hollow shell and an insulation cotton filling layer. The box door is provided with an observation window. The window is made of quartz glass to ensure light transmittance and heat insulation.

6. A contact heating high temperature tensile testing system for plates according to claim 1, characterized in that: The fixing module (4) is a steel plate (42) of a specific shape and size and a mounting frame (41). The steel plate is placed on an existing tensile testing machine. The designed shape and size match the support column and emergency stop button of the existing testing machine and serve as a limit reference. The mounting frame is symmetrically distributed on the left and right and is used to install the fixed cylinder (31) and the insulation box (33).

7. A contact heating high temperature tensile testing system for plate materials according to claim 1, characterized in that: The measuring module (6) is composed of a spotlight (61), an industrial camera (62), an infrared laser temperature measuring head (63) and a tripod support frame (64). The tripod support frame can be adjusted in height, the platform on which the camera and the spotlight are installed can also be adjusted in height, and the spotlight can also be adjusted in tilt angle. The infrared laser temperature measuring head is installed on a specially designed bracket, and can be adjusted in height and tilt angle.

8. A contact heating high temperature tensile testing system for plates according to claim 7, characterized in that: The industrial camera (62) continuously captures images during the stretching process of the sample. Before the sample is stretched, the speckle pattern must be evenly sprayed according to requirements. After the captured images are obtained, they are post-processed with computer program software to obtain the strain data of the sample.

9. The contact heating high temperature tensile testing system for plate materials according to claim 1, characterized in that: The temperature control module is a temperature control instrument as a whole. The output line of the heating rod and the output line of the infrared laser thermometer are both connected to this instrument, which displays the surface temperature of the sample in real time and adjusts the power of the heating rod according to the target temperature.

10. A measurement method for a contact heating high temperature tensile test system for a plate material according to any one of claims 1 to 10, characterized in that: The specific steps are as follows: Step 1: Install the device on the testing machine and connect the upper and lower loading modules with the loading part of the testing machine through pins; Step 2: Place the heating rod, laser temperature measuring head, industrial camera, air pump and temperature controller, and connect the relevant interfaces; Step 2: Open the door of the incubator and adjust the rotating rod so that the groove at the bottom of the clamping module is parallel to the front view surface; Step 3: Place both ends of the plate specimen that has been polished and sprayed with speckles into the grooves and secure them with screws; Step 4: Turn the clamping module to rotate the sample 90°, operate the cylinder to move the heating block close to the plate sample, and close the insulation box door; Step 5: Start the heating rod in the temperature controller to start heating, and adjust the position of the laser temperature measuring head so that the temperature of the middle sample can be measured; Step 6: When the temperature controller displays that the temperature reaches the target temperature, control the cylinder to adjust the heating block away from the sample so that the sample can be rotated 90°; Step 7: When the sample is facing the tester, the heating blocks are on both sides of the sample, the laser temperature measuring head continues to measure the temperature, and the temperature controller controls the power of the heating rod to maintain the temperature; Step 8: After the temperature stabilizes, adjust the camera position so that a clear image of the sample surface can be captured, and start the testing machine to conduct the test; Step 9: After the test, turn off the temperature controller, open the box door to dissipate heat, and save the data.

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