Control system for deformation rate of high-temperature compression test

Abstract

The invention provides a system for controlling the deformation rate of a high-temperature compression test. The system comprises a main transmission shaft for driving a hammer head to carry out compression deformation on a sample; the hammer head is matched with the main transmission shaft and applies compression force to the sample; the acceleration time control unit is used for controlling the acceleration process of the main transmission shaft and enabling the main transmission shaft to reach a preset speed within preset time; the collision detection unit is used for detecting the collision between the main transmission shaft and the hammer head and recording the collision occurrence time and position; the speed calculation unit is used for calculating the speed after the main transmission shaft accelerates and the common speed after the main transmission shaft collides with the hammer head; the displacement monitoring unit is used for monitoring the displacement of the main transmission shaft in real time and drawing a displacement time curve; the parameter adjusting unit is used for adjusting the acceleration time and the acceleration distance of the main transmission shaft; the distance and pressure adjusting unit is used for adjusting the initial distance between the main transmission shaft and the hammer head before a compression experiment and applying preset pressure to the sample; and the deformation control unit is used for controlling the movement of the main transmission shaft in stages in the compression experiment process and ensuring that the sample keeps a constant deformation rate in the whole deformation process.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal processing technology for steel materials, and in particular to a control system for deformation rate of a high-temperature compression test. Background Art

[0002] High-temperature compression testing is an important experimental method in materials science and engineering, used to study the mechanical properties and microstructural changes of metal materials under high-temperature conditions. High-temperature compression testing can reveal the influence of hot working process parameters (such as deformation temperature, deformation rate, and deformation amount) on the microstructure and properties of metal materials. These effects are crucial for optimizing hot working processes and improving product quality. Precise control of the deformation rate in high-temperature compression testing is a key factor in ensuring the accuracy and reliability of test results.

[0003] Currently, thermal simulation testing machines are widely used for high-temperature compression testing. These machines typically use a main drive shaft to drive a coaxial hammer to compress and deform the specimen. To control the deformation rate, conventional methods typically distance the main drive shaft from the hammer head, allowing the main drive shaft to accelerate before compressing the specimen. This method ensures sufficient speed when the main drive shaft contacts the hammer head, thereby achieving a predetermined deformation rate during the initial deformation phase.

[0004] Although the method of increasing the distance between the main drive shaft and the hammer head in the prior art can achieve control of the deformation rate to a certain extent, this method has obvious defects. First, there is no scientific and accurate calculation method for the distance between them in the prior art, resulting in inaccurate control of the deformation rate. Secondly, before compressing the sample, if contact occurs between the main drive shaft and the hammer head, the deformation rate of the sample in the initial stage of deformation will be lower than the preset value, causing the deformation rate to change from small to large during the test, ultimately affecting the accuracy of the test results. In addition, when controlling the deformation rate, the prior art fails to fully consider the interaction between the main drive shaft and the hammer head (such as friction and collision), which further limits the accuracy of the deformation rate control. Therefore, the prior art has problems with inaccurate deformation rate control and large deviations in test results in high-temperature compression tests, and cannot meet the needs of high-performance product development for precise process parameter control. Summary of the Invention

[0005] According to the technical problems raised above, a control system for the deformation rate of a high-temperature compression test is provided. Before the test begins, the system of the present invention separates the main drive shaft and the hammer head to the maximum distance to ensure that the main drive shaft is not interfered with by the hammer head during the acceleration process; the acceleration process of the main drive shaft is accurately controlled by the acceleration control unit, and the rate of the main drive shaft after acceleration and the common rate after collision with the hammer head are calculated using the relationship between momentum and impulse; the collision moment and position of the main drive shaft and the hammer head are detected by the collision detection unit, and the displacement of the main drive shaft is monitored in real time using the displacement monitoring unit to draw a displacement time curve; according to the displacement time curve and the rate calculation results, the acceleration time and acceleration distance of the main drive shaft are adjusted to ensure that the main drive shaft reaches a preset rate when colliding with the hammer head; the movement of the main drive shaft is divided into an acceleration stage and a compression deformation stage, and different rates are set for each stage to ensure that the sample maintains a constant deformation rate during the entire deformation process.

[0006] The technical means adopted in the present invention are as follows:

[0007] A control system for deformation rate of a high-temperature compression test, comprising:

[0008] The main transmission shaft is used to drive the hammer to compress and deform the sample;

[0009] The hammer head, which cooperates with the main transmission shaft, is used to apply compression force to the specimen;

[0010] An acceleration time control unit is used to control the acceleration process of the main transmission shaft so that the main transmission shaft reaches a preset speed within a preset time;

[0011] Collision detection unit, used to detect the collision between the main drive shaft and the hammer head, and record the time and location of the collision;

[0012] A rate calculation unit is used to calculate the rate of the main drive shaft after acceleration and the common rate of the main drive shaft after collision with the hammer head according to the mass of the main drive shaft, the acceleration time and the output of the collision detection unit;

[0013] Displacement monitoring unit, used to monitor the displacement of the main drive shaft in real time and draw a displacement time curve;

[0014] A parameter adjustment unit, used for adjusting the acceleration time and acceleration distance of the main transmission shaft according to the displacement time curve and the output of the rate calculation unit;

[0015] Distance and pressure adjustment unit, used to adjust the initial distance between the main drive shaft and the hammer head before the compression test and apply a preset pressure to the sample;

[0016] The deformation control unit is used to control the movement of the main drive shaft in stages during the compression test to ensure that the specimen maintains a constant deformation rate throughout the entire deformation process.

[0017] Furthermore, the acceleration time control unit includes an acceleration drive module and a time control module, wherein:

[0018] The acceleration drive module is used to provide acceleration power to the main transmission shaft;

[0019] The time control module is used to set the acceleration time of the main transmission shaft and control the acceleration drive module to complete the acceleration process within a preset time.

[0020] Furthermore, the collision detection unit includes a force sensor, a time recording module and a displacement recording module, wherein:

[0021] The force sensor is used to detect the collision force between the main transmission shaft and the hammer head;

[0022] The time recording module is used to record the time point when the collision occurs;

[0023] The displacement recording module is used to record the displacement of the main transmission shaft when a collision occurs.

[0024] Furthermore, the rate calculation unit calculates the rate of the main transmission shaft after acceleration, and the calculation formula is as follows:

[0025]

[0026] Among them, v1 represents the velocity of the main drive shaft after acceleration; I1 represents the momentum obtained by the main drive shaft after being accelerated by the system force during the acceleration time; m1 represents the mass of the main drive shaft.

[0027] Furthermore, the rate calculation unit calculates the common rate of the main transmission shaft and the hammer head after collision, and the calculation formula is as follows:

[0028]

[0029] Among them, v2 represents the common velocity of the main drive shaft and the hammer head after collision; m2 represents the mass of the hammer head; f(t) represents the function of friction force changing with time.

[0030] Furthermore, the displacement monitoring unit includes a displacement sensor module and a data processing module, wherein:

[0031] The displacement sensor module is used to monitor the displacement of the main transmission shaft in real time;

[0032] The data processing module is used to draw a displacement time curve according to the output of the displacement sensor module and analyze the slope of the curve to obtain the acceleration time and acceleration distance.

[0033] Furthermore, the data processing module analyzes the slope of the curve to determine the acceleration time and acceleration distance, specifically including:

[0034] Analyze the slope of the curve to obtain the rate v1 of the main drive shaft after acceleration, and find the time corresponding to v1, which is the acceleration time t1;

[0035] The slope of the curve corresponds to the speed v1 of the main transmission shaft after acceleration and the displacement of the main transmission shaft, and the displacement corresponding to v1 is found, which is the acceleration distance s1.

[0036] Furthermore, the parameter adjustment unit adjusts the operating speed of the main transmission shaft according to the acceleration time and acceleration distance of the main transmission shaft determined by the data processing module and according to the output of the speed calculation unit.

[0037] Furthermore, the distance and pressure adjustment unit includes a distance adjustment module, a pressure adjustment module and a contact detection module, wherein:

[0038] The distance adjustment module is used to adjust the initial distance between the main transmission shaft and the hammer head;

[0039] The pressure regulating module is used to adjust the pressure of the air hammer so that the sample is subjected to a preset pressure, and the preset pressure range is 100-300 Newtons;

[0040] The contact detection module is used to detect whether the main transmission shaft and the hammer head are in contact. When the two are in contact, the main transmission shaft exerts a force on the hammer head to reduce the tensile force on the sample. When the reduction value is greater than 10 Newtons, the movement of the main transmission shaft stops.

[0041] Furthermore, the deformation control unit includes an acceleration stage control module and a deformation stage control module, wherein:

[0042] The acceleration phase control module is used to control the main transmission shaft to run at a preset speed during the 0-acceleration time;

[0043] The deformation stage control module is used to control the main transmission shaft to run at a common speed after the collision during the entire deformation stage from the acceleration time to the end of the compression deformation.

[0044] Compared with the prior art, the present invention has the following advantages:

[0045] 1. The present invention provides a control system for the deformation rate of a high-temperature compression test. Before the compression test, the initial distance between the main drive shaft and the hammer head is adjusted to prevent the main drive shaft from contacting the hammer head prematurely during the acceleration process. This ensures that the main drive shaft can complete the acceleration process without interference, thereby reaching a preset rate when contacting the hammer head, avoiding the problem of the deformation rate of the sample being lower than the preset value in the initial deformation stage.

[0046] 2. The present invention provides a control system for the deformation rate of a high-temperature compression test, which accurately controls the acceleration process of the main drive shaft through an acceleration control unit to ensure that the main drive shaft reaches a preset speed within a preset time. This can effectively reduce the deviation in test results caused by inaccurate acceleration time and improve the reliability and repeatability of the experiment.

[0047] 3. The present invention provides a control system for the deformation rate of a high-temperature compression test. The rate calculation unit calculates the rate of the main drive shaft based on the relationship between momentum and impulse. The rate can be accurately calculated without considering complex stress conditions, which simplifies the control logic, reduces the complexity of the system, and improves the accuracy of the rate calculation, further enhancing the accuracy of the experiment.

[0048] 4. The present invention provides a control system for the deformation rate of a high-temperature compression test, which monitors the collision moment and position of the main drive shaft and the hammer head in real time through a collision detection unit, and accurately records the time and position of the collision, so that the system can adjust the motion parameters of the main drive shaft in real time to ensure that the main drive shaft and the hammer head can compress and deform the sample at a common speed after the collision, thereby avoiding sudden changes in rate caused by collision.

[0049] 5. The present invention provides a control system for the deformation rate of a high-temperature compression test. By using a displacement monitoring unit, the displacement of the main drive shaft is monitored in real time and a displacement-time curve is plotted. This allows for dynamic adjustment of the acceleration time and distance of the main drive shaft, ensuring that the speed of the main drive shaft when in contact with the hammer head is consistent with a preset value, further improving the accuracy and reliability of the experiment.

[0050] 6. The present invention provides a control system for the deformation rate of a high-temperature compression test. The parameter adjustment unit adjusts the motion parameters of the main drive shaft according to the displacement-time curve and the rate calculation results, optimizes the acceleration process of the main drive shaft, and can optimize the control parameters in real time according to the actual working conditions to ensure the stability and accuracy of the experimental process.

[0051] 7. This invention provides a high-temperature compression test deformation rate control system. Using a staged deformation control unit, the main drive shaft's motion is divided into an acceleration phase and a compression deformation phase, ensuring that the specimen maintains a constant deformation rate throughout the entire deformation process. This staged control strategy effectively avoids fluctuations in deformation rate and improves the accuracy and reliability of experimental results.

[0052] 8. The present invention provides a high-temperature compression test deformation rate control system that, through modular design, breaks down a complex control system into multiple functional modules, achieving the technical effects of reducing system complexity and improving system stability and maintainability. This modular design clarifies the functions of each component of the system, facilitating maintenance and upgrades while also improving the overall system performance and reliability.

[0053] Based on the above reasons, the present invention can be widely promoted in the fields of hot working technology of steel materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0055] Figure 1 This is a system structure diagram of the present invention.

[0056] Figure 2 This is a structural block diagram of the acceleration time control unit of the present invention.

[0057] Figure 3 This is a structural block diagram of the collision detection unit of the present invention.

[0058] Figure 4 This is a structural block diagram of the displacement monitoring unit of the present invention.

[0059] Figure 5 This is a structural block diagram of the distance and pressure adjustment unit of the present invention.

[0060] Figure 6 This is a structural block diagram of the deformation control unit of the present invention. DETAILED DESCRIPTION

[0061] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0062] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or apparatuses.

[0063] like Figure 1 As shown, the present invention provides a control system for deformation rate of a high temperature compression test, comprising:

[0064] The main transmission shaft is used to drive the hammer to compress and deform the sample;

[0065] The hammer head, which cooperates with the main transmission shaft, is used to apply compression force to the specimen;

[0066] An acceleration time control unit is used to control the acceleration process of the main transmission shaft so that the main transmission shaft reaches a preset speed within a preset time;

[0067] Collision detection unit, used to detect the collision between the main drive shaft and the hammer head, and record the time and location of the collision;

[0068] A rate calculation unit is used to calculate the rate of the main drive shaft after acceleration and the common rate of the main drive shaft after collision with the hammer head according to the mass of the main drive shaft, the acceleration time and the output of the collision detection unit;

[0069] Displacement monitoring unit, used to monitor the displacement of the main drive shaft in real time and draw a displacement time curve;

[0070] A parameter adjustment unit, used for adjusting the acceleration time and acceleration distance of the main transmission shaft according to the displacement time curve and the output of the rate calculation unit;

[0071] Distance and pressure adjustment unit, used to adjust the initial distance between the main drive shaft and the hammer head before the compression test and apply a preset pressure to the sample;

[0072] The deformation control unit is used to control the movement of the main drive shaft in stages during the compression test to ensure that the specimen maintains a constant deformation rate throughout the entire deformation process.

[0073] When specifically implemented, as a preferred embodiment of the present invention, Figure 2 As shown, the acceleration time control unit includes an acceleration drive module and a time control module, wherein:

[0074] The acceleration drive module is used to provide acceleration power to the main transmission shaft;

[0075] The time control module is used to set the acceleration time of the main transmission shaft and control the acceleration drive module to complete the acceleration process within a preset time.

[0076] When specifically implemented, as a preferred embodiment of the present invention, Figure 3 As shown, the collision detection unit includes a force sensor, a time recording module and a displacement recording module, wherein:

[0077] The force sensor is used to detect the collision force between the main transmission shaft and the hammer head;

[0078] The time recording module is used to record the time point when the collision occurs;

[0079] The displacement recording module is used to record the displacement of the main transmission shaft when a collision occurs.

[0080] In a specific implementation, as a preferred embodiment of the present invention, the rate calculation unit calculates the rate of the main transmission shaft after acceleration, and the calculation formula is as follows:

[0081]

[0082] Among them, v1 represents the velocity of the main drive shaft after acceleration; I1 represents the momentum obtained by the main drive shaft after being accelerated by the system force during the acceleration time; m1 represents the mass of the main drive shaft.

[0083] In specific implementation, as a preferred embodiment of the present invention, the rate calculation unit calculates the common rate of the main transmission shaft and the hammer head after collision, and the calculation formula is as follows:

[0084]

[0085] Among them, v2 represents the common velocity of the main drive shaft and the hammer head after collision; m2 represents the mass of the hammer head; f(t) represents the function of friction force changing with time.

[0086] When specifically implemented, as a preferred embodiment of the present invention, Figure 4 As shown, the displacement monitoring unit includes a displacement sensor module and a data processing module, wherein:

[0087] The displacement sensor module is used to monitor the displacement of the main transmission shaft in real time;

[0088] The data processing module is used to draw a displacement time curve according to the output of the displacement sensor module and analyze the slope of the curve to obtain the acceleration time and acceleration distance.

[0089] In specific implementation, as a preferred embodiment of the present invention, the data processing module analyzes the slope of the curve to determine the acceleration time and acceleration distance, specifically including:

[0090] Analyze the slope of the curve to obtain the rate v1 of the main drive shaft after acceleration, and find the time corresponding to v1, which is the acceleration time t1;

[0091] The slope of the curve corresponds to the speed v1 of the main transmission shaft after acceleration and the displacement of the main transmission shaft, and the displacement corresponding to v1 is found, which is the acceleration distance s1.

[0092] In specific implementation, as a preferred embodiment of the present invention, the parameter adjustment unit adjusts the operating speed of the main transmission shaft according to the acceleration time and acceleration distance of the main transmission shaft determined by the data processing module and according to the output of the speed calculation unit.

[0093] When specifically implemented, as a preferred embodiment of the present invention, Figure 5 As shown, the distance and pressure adjustment unit includes a distance adjustment module, a pressure adjustment module and a contact detection module, wherein:

[0094] The distance adjustment module is used to adjust the initial distance between the main transmission shaft and the hammer head;

[0095] The pressure regulating module is used to adjust the pressure of the air hammer so that the sample is subjected to a preset pressure, and the preset pressure range is 100-300 Newtons;

[0096] The contact detection module is used to detect whether the main transmission shaft and the hammer head are in contact. When the two are in contact, the main transmission shaft exerts a force on the hammer head to reduce the tensile force on the sample. When the reduction value is greater than 10 Newtons, the movement of the main transmission shaft stops.

[0097] When specifically implemented, as a preferred embodiment of the present invention, Figure 6 As shown, the deformation control unit includes an acceleration stage control module and a deformation stage control module, wherein:

[0098] The acceleration phase control module is used to control the main transmission shaft to run at a preset speed during the 0-acceleration time;

[0099] The deformation stage control module is used to control the main transmission shaft to run at a common speed after the collision during the entire deformation stage from the acceleration time to the end of the compression deformation.

[0100] Example 1

[0101] The specimen was made of low-carbon steel and machined into a cylindrical shape with a diameter of 8 mm and a height of 15 mm. The experimental process used was: heating to 1200°C at a heating rate of 10°C / s, holding for 5 minutes, and then cooling to 1000°C. The deformation was performed at this temperature. The main drive shaft was accelerated at a rate v1 (deformation rate) of 15 mm / s, and the stretching was 5 mm. The test was completed by the following steps:

[0102] Step 1: Based on the structural characteristics of the thermal simulation test machine, the test machine compresses and deforms the specimen by driving a hammer coaxial with the main drive shaft. First, separate the main drive shaft and the hammer to a distance of 15 mm.

[0103] Step 2: According to the experimental requirements, the speed v1 of the main transmission shaft after acceleration is 15 mm / s, and the speed calculation unit calculates the common speed v2 of the main transmission shaft after collision with the hammer head according to the calculation formula = 40 mm / s;

[0104] Step 3. When the main drive shaft and the hammer are separated to the maximum distance, start the control system, set the moving speed of the main drive shaft to 40 mm / s, collect displacement parameters at the same time, and draw a displacement-time curve. The time t1 = 0.06 seconds required for the main drive shaft to reach a moving speed of 40 mm / s is the acceleration time. By correlating the slope of the curve with the moving speed of the main drive shaft and the displacement of the main drive shaft, the corresponding displacement s1 = 1.8 mm is found, which is the acceleration distance.

[0105] Step 4: First, separate the main drive shaft from the hammer head by 2 mm. Start the testing machine. The air hammer drives the hammer head to compress the simulated specimen between the two anvils. Adjust the pressure of the air hammer so that the specimen is subjected to a pressure of 200 Newtons. Then start the hydraulic system to slowly move the main drive shaft toward the hammer head. When the two come into contact, the main drive shaft exerts a force on the hammer head, causing the specimen to withstand a pressure increase to 220 Newtons. The main drive shaft stops moving. Then, start the hydraulic system to retract the main drive shaft 1.8 mm.

[0106] Step 5: When the sample reaches the predetermined deformation temperature, the main drive shaft drives the hammer to compress the sample. The main drive shaft movement is controlled in two stages: the first stage is the acceleration stage, with a running speed of 40 mm / s from 0 to 0.06 seconds. The second stage is the compression deformation stage, with a running speed of 15 mm / s from 0.06 seconds to the end of the compression deformation.

[0107] Example 2

[0108] The specimens were made of low-carbon steel and machined into cylindrical shapes with dimensions of 8 mm in diameter and 15 mm in height. The experimental process used was heating to 1200°C at a rate of 10°C / s, holding for 5 minutes, and then cooling to 950°C. Deformation was performed at this temperature, with the main drive shaft accelerating at a rate v1 (deformation rate) of 150 mm / s and a reduction of 5 mm. The experiment was completed using the following steps:

[0109] Step 1: Based on the structural characteristics of the thermal simulation test machine, the test machine compresses and deforms the specimen by driving a hammer coaxial with the main drive shaft. First, separate the main drive shaft and the hammer to a distance of 15 mm.

[0110] Step 2: According to the experimental requirements, the speed v1 of the main transmission shaft after acceleration is 150 mm / s, and the speed calculation unit calculates the common speed v2 of the main transmission shaft after collision with the hammer head according to the calculation formula = 400 mm / s;

[0111] Step 3. When the main drive shaft and the hammer are separated to the maximum distance, start the control system, set the moving speed of the main drive shaft to 400 mm / s, collect displacement parameters at the same time, and draw a displacement time curve. The time t1 = 0.02 seconds required for the main drive shaft to reach a moving speed of 400 mm / s is the acceleration time. By correlating the slope of the curve with the moving speed of the main drive shaft and the displacement of the main drive shaft, the corresponding displacement s1 = 2.28 mm is found, which is the acceleration distance.

[0112] Step 4: First, separate the main drive shaft from the hammer head by 3 mm. Start the testing machine's air hammer to drive the hammer head to compress the simulated specimen between the two anvils. Adjust the pressure of the air hammer so that the specimen is subjected to a pressure of 210 Newtons. Then start the hydraulic system to slowly move the main drive shaft toward the hammer head. When the two come into contact, the main drive shaft exerts a force on the hammer head, causing the specimen to withstand a pressure of 260 Newtons. The main drive shaft stops moving. Then, start the hydraulic system to retract the main drive shaft 2.28 mm.

[0113] Step 5: When the sample reaches the predetermined deformation temperature, the main drive shaft drives the hammer to compress the sample. The main drive shaft movement is controlled in two stages: the first stage is the acceleration stage, with a running speed of 400 mm / s from 0 to 0.02 seconds. The second stage is the compression deformation stage, with a running speed of 150 mm / s from 0.02 seconds to the end of the compression deformation.

[0114] In summary, the present invention determines that the high-temperature compression experiment is divided into two stages, acceleration and deformation, by linking the momentum and impulse of the main transmission shaft and the hammer head. The speed of the main transmission shaft in the two stages is reasonably calculated, thereby ensuring that the deformation rate of the sample remains constant throughout the deformation process. This can not only improve the experimental accuracy, but also increase the experimental success rate, providing more effective guidance for actual production.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control system for deformation rate of high temperature compression test, characterized in that: include: The main transmission shaft is used to drive the hammer to compress and deform the sample; The hammer head, which cooperates with the main transmission shaft, is used to apply compression force to the specimen; An acceleration time control unit is used to control the acceleration process of the main transmission shaft so that the main transmission shaft reaches a preset speed within a preset time; Collision detection unit, used to detect the collision between the main drive shaft and the hammer head, and record the time and location of the collision; A rate calculation unit is used to calculate the rate of the main drive shaft after acceleration and the common rate of the main drive shaft after collision with the hammer head according to the mass of the main drive shaft, the acceleration time and the output of the collision detection unit; Displacement monitoring unit, used to monitor the displacement of the main drive shaft in real time and draw a displacement time curve; A parameter adjustment unit, used for adjusting the acceleration time and acceleration distance of the main transmission shaft according to the displacement time curve and the output of the rate calculation unit; Distance and pressure adjustment unit, used to adjust the initial distance between the main drive shaft and the hammer head before the compression test and apply a preset pressure to the sample; The deformation control unit is used to control the movement of the main drive shaft in stages during the compression test to ensure that the specimen maintains a constant deformation rate throughout the entire deformation process.

2. A high temperature compression test deformation rate control system according to claim 1, characterized in that: The acceleration time control unit includes an acceleration drive module and a time control module, wherein: The acceleration drive module is used to provide acceleration power to the main transmission shaft; The time control module is used to set the acceleration time of the main transmission shaft and control the acceleration drive module to complete the acceleration process within a preset time.

3. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The collision detection unit includes a force sensor, a time recording module and a displacement recording module, wherein: The force sensor is used to detect the collision force between the main transmission shaft and the hammer head; The time recording module is used to record the time point when the collision occurs; The displacement recording module is used to record the displacement of the main transmission shaft when a collision occurs.

4. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The speed calculation unit calculates the speed of the main transmission shaft after acceleration, and the calculation formula is as follows: Among them, v1 represents the velocity of the main drive shaft after acceleration; I1 represents the momentum obtained by the main drive shaft after being accelerated by the system force during the acceleration time; m1 represents the mass of the main drive shaft.

5. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The velocity calculation unit calculates the common velocity of the main transmission shaft and the hammer head after collision, and the calculation formula is as follows: Among them, v2 represents the common velocity of the main drive shaft and the hammer head after collision; m2 represents the mass of the hammer head; f(t) represents the function of friction force changing with time.

6. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The displacement monitoring unit includes a displacement sensor module and a data processing module, wherein: The displacement sensor module is used to monitor the displacement of the main transmission shaft in real time; The data processing module is used to draw a displacement time curve according to the output of the displacement sensor module and analyze the slope of the curve to obtain the acceleration time and acceleration distance.

7. A high temperature compression test deformation rate control system according to claim 6, characterized in that: The data processing module analyzes the slope of the curve to determine the acceleration time and acceleration distance, specifically including: Analyze the slope of the curve to obtain the rate v1 of the main drive shaft after acceleration, and find the time corresponding to v1, which is the acceleration time t1; The slope of the curve corresponds to the speed v1 of the main transmission shaft after acceleration and the displacement of the main transmission shaft, and the displacement corresponding to v1 is found, which is the acceleration distance s1.

8. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The parameter adjustment unit adjusts the running speed of the main transmission shaft according to the acceleration time and acceleration distance of the main transmission shaft determined by the data processing module and according to the output of the speed calculation unit.

9. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The distance and pressure adjustment unit includes a distance adjustment module, a pressure adjustment module and a contact detection module, wherein: The distance adjustment module is used to adjust the initial distance between the main transmission shaft and the hammer head; The pressure regulating module is used to adjust the pressure of the air hammer so that the sample is subjected to a preset pressure, and the preset pressure range is 100-300 Newtons; The contact detection module is used to detect whether the main transmission shaft and the hammer head are in contact. When the two are in contact, the main transmission shaft exerts a force on the hammer head to reduce the tensile force on the sample. When the reduction value is greater than 10 Newtons, the movement of the main transmission shaft stops.

10. The high temperature compression test deformation rate control system according to claim 1, characterized in that: The deformation control unit includes an acceleration stage control module and a deformation stage control module, wherein: The acceleration phase control module is used to control the main transmission shaft to run at a preset speed within the range of 0-acceleration time; The deformation stage control module is used to control the main transmission shaft to run at a common speed after the collision during the entire deformation stage from the acceleration time to the end of the compression deformation.

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