CN116060151A

CN116060151A - Thermal cycle experimental device

Info

Publication number: CN116060151A
Application number: CN202211661710.XA
Authority: CN
Inventors: 陶倩楠; 杨顺; 魏大盛; 刘怡慧
Original assignee: Beihang University
Current assignee: Beihang University
Priority date: 2022-12-23
Filing date: 2022-12-23
Publication date: 2023-05-05

Abstract

The application provides a thermal cycle experimental apparatus relates to the experimental facilities field. The thermal cycle experimental device comprises a heating furnace, an execution unit and a regulation and control unit. The heating furnace is provided with a furnace chamber for containing the sample and an inlet and an outlet communicated with the furnace chamber. The execution unit comprises a sample tray, a connecting rod and a sealing cover, wherein the sample tray and the sealing cover are connected with the connecting rod, the sample tray is used for bearing a sample, and the sealing cover is used for opening or closing the inlet and the outlet. The regulating and controlling unit is connected with the connecting rod and is used for driving the connecting rod to slide along the extending direction of the connecting rod so as to enable the sample tray to enter or leave the furnace chamber; and after the sample tray enters the furnace chamber, the sealing cover closes the inlet and the outlet. The thermal cycle experimental device does not need to realize thermal cycle simulation of the sample by heating and cooling, improves the influence of the temperature change process on experimental results, and is more flexible and reliable in temperature control.

Description

Thermal cycle experimental device

Technical Field

The application relates to the field of experimental equipment, in particular to a thermal cycle experimental device.

Background

The thermal cycle test is a very common and important test type, is an important basic test for researching thermodynamic performance and fatigue performance of materials, and aims to expose potential material defects and manufacturing quality defects in products, eliminate early failure and improve the reliability of the products. In the thermal cycle experiment, the sample needs to be repeatedly heated and cooled, and the cycle times of heating and cooling can reach tens of thousands times. The prior thermal cycle device comprises a constant temperature type experimental device and a variable temperature type experimental device, wherein the constant temperature type experimental device can heat a sample to a preset temperature. However, the temperature cannot be changed by a program, which results in that an experimenter is required to manually start and stop the experimental device in the thermal cycle experiment, thereby realizing the thermal cycle. The temperature-changing experimental device is provided with a set of temperature control system, wherein a cold source/heat source or a cold working medium/hot working medium is arranged in the temperature-changing experimental device, and the discharge of the cold working medium/hot working medium is controlled by an electromagnetic valve. The upper computer controls the opening/closing of the electromagnetic valve according to a certain time interval, so that cold working medium/hot working medium enters the cavity, and the purpose of heating or cooling is achieved. The constant temperature experimental device needs the experimenter to manually control the device to be powered on or powered off, thereby realizing thermal cycle.

The inventor finds that the constant temperature device has the defects that the whole process needs to be manually participated, the workload of experimental staff is large, and the efficiency is low. The temperature-changing device has the defects that when the temperature changes, an obvious temperature raising/reducing process exists, the temperature changes slowly, and the stability, the reliability and the repeatability of a temperature control system are poor.

Disclosure of Invention

The application provides a thermal cycle experimental device to improve the above problems.

The invention is specifically as follows:

based on the above object, the present embodiment provides a thermal cycle experiment apparatus, including:

a heating furnace having a furnace chamber for accommodating a sample and an inlet and an outlet communicating with the furnace chamber;

the execution unit comprises a sample tray, a connecting rod and a sealing cover, wherein the sample tray and the sealing cover are connected with the connecting rod, the sample tray is used for bearing a sample, and the sealing cover is used for opening or closing the inlet and the outlet;

the regulating and controlling unit is connected with the connecting rod and is used for driving the connecting rod to slide along the extending direction of the connecting rod so as to enable the sample tray to enter or leave the furnace chamber; and after the sample tray enters the furnace chamber, the sealing cover closes the inlet and the outlet.

In one embodiment of the invention, the furnace is provided with a viewing window for viewing a sample located within the furnace chamber.

In one embodiment of the invention, the sealing cover is sleeved outside the connecting rod, and the sealing cover is slidably matched with the connecting rod in the axial direction of the connecting rod; the sealing cover and the sample tray are arranged at intervals in the axial direction of the connecting rod.

In one embodiment of the invention, the sealing cover comprises a fixed body, a sealing body and a locking body, wherein the sealing body is fixedly connected with the fixed body, and the sealing body and the fixed body are sleeved outside the connecting rod and are slidably matched with the connecting rod; the locking body is in threaded connection with the outside of the fixed body, the locking body is provided with a first position and a second position which are mutually switched, and when the locking body is positioned at the first position, the locking body is in abutting connection with the connecting rod so as to limit the relative sliding of the fixed body and the connecting rod; in the second position, the locking body is spaced from the connecting rod to allow the fixed body to slide relative to the connecting rod.

In one embodiment of the invention, the sealing body is provided in a reducing structure, and the cross-sectional area of the sealing body gradually increases from one end of the sealing body near the sample tray to the other end.

In one embodiment of the invention, the regulating and controlling unit comprises a frame, a driver, a transmission mechanism and a connecting mechanism, wherein the driver is arranged on the frame, the driver is connected with the connecting mechanism through the transmission mechanism, and the connecting mechanism is connected with the connecting rod; the driver is used for transmitting power to the connecting mechanism through the transmission mechanism so as to drive the connecting rod to move through the connecting mechanism.

In one embodiment of the invention, the driver is set as a motor, the transmission mechanism comprises a screw rod and a sliding block, the screw rod is fixedly connected with an output shaft of the motor, the sliding block is in threaded connection with the outside of the screw rod, the sliding block is slidably connected with the frame, and the sliding block and the frame are relatively fixed in the circumferential direction of the screw rod; the connecting mechanism is connected with the sliding block.

In one embodiment of the invention, the connecting rod is slidably connected with the connecting mechanism in an axial direction of the connecting rod.

In one embodiment of the invention, the connecting mechanism comprises a connecting column and a locking screw, the connecting column is connected with the sliding block, a clamping groove is formed in the end part of the connecting column, the clamping groove is provided with two opposite groove walls, and the connecting rod is clamped in the clamping groove; the locking screw is in threaded connection with the connecting column, and the locking screw is used for enabling the two groove walls to be close to or far away from each other so as to enable the two groove walls to clamp or loosen the connecting rod.

In one embodiment of the invention, the execution unit further comprises a heat-insulating cover, the heat-insulating cover is connected with the connecting rod, the sample tray is located between the heat-insulating cover and the sealing cover, and the heat-insulating cover is used for sealing the inlet and the outlet when the sample tray leaves the furnace chamber.

The beneficial effects of the invention are as follows:

in summary, the thermal cycle experimental apparatus provided in this embodiment can utilize the heating furnace to heat the sample at a constant temperature, and can adjust the temperature of the heating furnace according to the requirement, thereby realizing heating at a set temperature. In the heating process, the sample can move relative to the heating furnace under the cooperation of the execution unit and the positioning unit, namely, the sample tray filled with the sample can be driven by the positioning unit to leave or enter the heating furnace, heating treatment is performed when the sample enters the heating furnace, and the sample is stopped to be heated after leaving the heating furnace, so that the thermal cycle is realized. Meanwhile, in the thermal cycle process, the heating furnace does not need to be repeatedly started and stopped, compared with the prior art, the thermal cycle is realized through gradual temperature rise and temperature reduction of the temperature, the operation is more convenient and flexible, the condition that experimental result errors are large due to the fact that the sample is in the environment of slow temperature change can not occur, the temperature control of the experimental device in the embodiment is more stable and reliable, the result errors of repeated experiments for many times are small, and the experimental result accuracy is high.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of a thermal cycling experimental device provided in the present application;

fig. 2 is a schematic structural diagram of a heating furnace provided by the present application;

FIG. 3 is a schematic diagram of an execution unit provided in the present application;

fig. 4 is a schematic diagram of application state switching of the thermal cycle experimental device provided in the present application;

FIG. 5 is a schematic diagram of a cooperation structure of an execution unit and a heating furnace provided by the present application;

fig. 6 is a schematic diagram of a modified structure of an execution unit provided in the present application.

Icon:

001-sample; 100-heating furnace; 110-furnace chamber; 120-import and export; 130-a viewing window; 140-supporting rods; 200-an execution unit; 210-sample tray; 211-grooves; 212-a guide hole; 220-connecting rods; 230-capping; 231-a fixed body; 232-a seal; 233-locking body; 240-a heat preservation cover; 250-connecting rod; 300-a positioning unit; 310-rack; 320-a driver; 330-a transmission mechanism; 331-a lead screw; 332-a slider; 340-a connection mechanism; 341-connecting the columns; 342-locking screw; 343-a clamping groove; 400-control unit.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be noted that, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that is conventionally put when the product of the application is used, or the orientation or positional relationship that is conventionally understood by those skilled in the art, or the orientation or positional relationship that is conventionally put when the product of the application is used, which is merely for convenience of describing the application and simplifying the description, and is not indicative or implying that the thermal cycle experiment device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be directly connected or indirectly connected through an intermediate medium. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

Examples

In the embodiment, the thermal cycle experimental device does not need to realize thermal cycle simulation of the sample through temperature rise and temperature reduction, so that the influence of the temperature change process on an experimental result is improved, and the temperature control is more flexible and reliable.

In this embodiment, it should be noted that the application scenario of the thermal cycle experimental apparatus is not limited, and the thermal cycle experimental apparatus can adapt to the study of the mechanical properties and fatigue properties of various materials, and the thermal cycle experimental apparatus is not particularly limited in this embodiment.

Referring to fig. 1, 2 and 5, in the present embodiment, the thermal cycle experiment device includes a heating furnace 100, an execution unit 200 and a regulation unit. The heating furnace 100 has a furnace chamber 110 for accommodating a sample 001, and an inlet/outlet 120 communicating with the furnace chamber 110. The execution unit 200 includes a sample tray 210, a connection rod 220, and a cover 230, wherein the sample tray 210 and the cover 230 are connected to the connection rod 220, the sample tray 210 is used for carrying a sample 001, and the cover 230 is used for opening or closing the inlet 120. The regulating unit is connected with the connecting rod 220, and is used for driving the connecting rod 220 to slide along the extending direction of the connecting rod 220 so as to enable the sample tray 210 to enter or leave the furnace chamber 110; and after the sample tray 210 enters the oven cavity 110, the cover 230 closes the access opening 120.

The working principle of the thermal cycle experimental device provided in this embodiment is as follows:

firstly, adjusting the position of an execution unit 200 to enable a sample tray 210 of the execution unit 200 to be positioned outside the heating furnace 100, and then, placing a sample 001 to be researched on the sample tray 210; the positioning unit 300 is activated to move the actuator 200 and move the sample tray 210 and the sample 001 together into the heating furnace 100. The movement pattern of the positioning unit 300 is controlled by setting the start-stop time of the positioning unit so that the sample 001 can be moved out of the heating furnace 100 after the sample 001 is in the heating furnace 100 for a set time and is again fed into the heating furnace 100 after the sample 001 is moved out of the heating furnace 100 for a set time. When the sample 001 is located in the heating furnace 100, the sample 001 is heated, and when the sample 001 is located outside the heating furnace 100, the heating of the sample 001 is stopped, and thus, a thermal cycle is realized. Compared with the prior art, the temperature of the heating element needs to be adjusted to realize thermal circulation through temperature rise and temperature reduction, and the experimental device of the embodiment is more convenient and flexible and has high reliability.

In this embodiment, the heating furnace 100 is configured as a square structure, the top of the heating furnace 100 is provided with an inlet and an outlet 120, and the inlet and the outlet 120 are circular holes, and the inlet and the outlet 120 are communicated with the square furnace chamber 110 inside the heating furnace 100. The observation window 130 is arranged on the side part of the heating furnace 100, such as the front side, the observation window 130 can be made of a high-temperature-resistant light-transmitting material, so that when the sample 001 is positioned in the heating furnace 100 for heating, the state of the sample 001 in the heating furnace 100 can be observed through the observation window 130, and the adjustment or shutdown of a heating strategy can be conveniently carried out in time when an abnormal condition or other conditions occur in an experiment, so that the accident rate is reduced.

It should be appreciated that the viewing window 130 may be made of high temperature resistant glass. For example, a through hole may be formed in the heating furnace 100, high temperature resistant glass may be embedded in the through hole, and an insulating layer may be provided around the high temperature resistant glass.

Referring to fig. 5, in other embodiments, optionally, a plurality of support rods 140 are disposed inside the heating furnace 100, where the plurality of support rods 140 are cylindrical rods and are arranged in parallel at intervals, and each support rod 140 is parallel to the axis of the inlet/outlet 120. For example, the number of the support rods 140 is three, and the three support rods 140 are uniformly spaced around the axis of the inlet/outlet 120.

Referring to fig. 5 and 6, in this embodiment, the connecting rod 220 is a circular rod. The sample tray 210 is a disc, a groove 211 is formed in the sample tray 210, and the sample 001 can be accommodated in the groove 211. Further, the groove 211 is a reducing groove with a circular cross section, specifically, the cross section profile of the groove 211 is circular, and the cross section diameter of the groove 211 gradually increases in the direction from the groove bottom wall to the groove opening. Meanwhile, three guide holes 212 penetrating the bottom wall of the groove 211 are arranged on the sample tray 210, each guide hole 212 is a round hole, and a port of the guide hole 212 far away from the bottom wall of the groove 211 is arranged as a conical port, so that the function of guiding the support rod 140 to be inserted into the guide hole 212 is achieved. By providing the sample tray 210 as a circular disk and the recess 211 as a conical recess, a circular sample 001 can be laid flat in the recess 211, thereby accommodating the placement of samples 001 of different sizes. After the sample 001 is positioned in the groove 211, the sample 001 is arranged substantially horizontally, i.e., parallel to the bottom wall of the groove 211 or perpendicular to the center line of the groove 211, and the position of the sample 001 is stable and reliable. And, the edge of sample dish 210 passes through connecting rod 250 and the end connection of connecting rod 220, and connecting rod 250 can be one or more, and for example, connecting rod 250 can be two, and two connecting rods 250 are the central symmetry and arrange, and the distance between two connecting rods 250 is greater than the width of the notch of recess 211, is difficult for influencing sample 001 and puts into recess 211. After sample tray 210 is secured to connecting rod 220 by connecting rod 250, the axis of sample tray 210 is collinear with the axis of connecting rod 220. During the process of the sample tray 210 entering and exiting the oven cavity 110, the sample tray 210 always keeps the coaxial position with the oven cavity 110, and the operation is stable and reliable.

Referring to fig. 3, optionally, the cover 230 includes a fixing body 231, a sealing body 232 and a locking body 233, the sealing body 232 is fixedly connected with the fixing body 231, and the sealing body 232 and the fixing body 231 are sleeved outside the connecting rod 220 and slidably matched with the connecting rod 220; the locking body 233 may be a jackscrew, and the locking body 233 is screwed to the outside of the fixing body 231. The locking body 233 has a first position and a second position that are switched to each other, and when in the first position, the locking body 233 abuts against the connection rod 220 to restrict the fixing body 231 and the connection rod 220 from sliding relatively. In the second position, the locking body 233 is spaced from the connecting rod 220 to allow the fixing body 231 to slide relative to the connecting rod 220. Further, the sealing body 232 is provided in a variable diameter structure, and the cross-sectional area of the sealing body 232 gradually increases from one end of the sealing body 232 near the sample tray 210 to the other end. For example, the sealing body 232 is a cone. By setting the sealing body 232 to be of a variable diameter structure, the small end of the sealing body 232 is close to the inlet and outlet 120, so that the sealing body 232 is convenient to insert into the inlet and outlet 120 when the inlet and outlet 120 is required to be sealed, can be pressed at the inlet and outlet 120, and has wide application range.

Referring to fig. 6, in other embodiments, the execution unit 200 further includes a heat-preserving cover 240, and the heat-preserving cover 240 may have a cone structure. The heat preservation cover 240 is connected with the connecting rod 220, the sample tray 210 is located between the heat preservation cover 240 and the sealing cover 230, and the heat preservation cover 240 is used for sealing the inlet and the outlet 120 when the sample tray 210 leaves the furnace chamber 110, so that the temperature in the heating furnace 100 is not easy to lose, and energy is saved. It should be appreciated that when the thermal cover 240 is connected to the lower portion of the sample tray 210, the thermal cover 240 is also provided with a relief hole so that the support rod 140 passes through the relief hole and then enters the guide hole 212.

Referring to fig. 1 and 4, in this embodiment, the optional control unit includes a frame 310, a driver 320, a transmission mechanism 330 and a connection mechanism 340. The driver 320 is arranged on the frame 310, the driver 320 is connected with the connecting mechanism 340 through the transmission mechanism 330, and the connecting mechanism 340 is connected with the connecting rod 220; the driver 320 is used for transmitting power to the connecting mechanism 340 through the transmission mechanism 330 to drive the connecting rod 220 to move through the connecting mechanism 340.

Alternatively, the driver 320 is provided as a motor. The transmission mechanism 330 comprises a screw 331 and a slide block 332, the screw 331 is fixedly connected with an output shaft of the motor, the slide block 332 is in threaded connection with the outside of the screw 331, the slide block 332 is slidably connected with the frame, and the slide block 332 and the frame are relatively fixed in the circumferential direction of the screw 331. After the motor is started, the screw 331 rotates, and the slider 332 does not rotate together with the screw 331, but slides reciprocally in the extending direction of the screw 331, thereby driving the connection mechanism 340 connected with the slider 332 to move together. The connecting mechanism 340 includes a connecting column 341 and a locking screw 342, the connecting column 341 is connected with the slider 332, the end of the connecting column 341 is provided with a slot 343, the slot 343 has two opposite slot walls, and the connecting rod 220 is clamped in the slot 343. The locking screw 342 is screwed to the connection post 341, and the locking screw 342 serves to move the two groove walls toward or away from each other so that the two groove walls clamp or unclamp the connection rod 220. That is, the connection rod 220 is connected to the connection column 341, and the connection rod 220 does not slide with respect to the connection column 341 when the locking screw 342 is tightened, and the connection rod 220 is not clamped by the two groove walls when the locking screw 342 is loosened, so that the connection rod 220 can slide with respect to the connection column 341, thereby adjusting the position. When the connection column 341 and the connection rod 220 are mounted, the connection column 341 is disposed perpendicular to the connection rod 220, and the connection rod 220 is disposed parallel to the screw 331.

In this embodiment, optionally, the thermal cycle experiment device further includes a control unit 400, where the control unit 400 may be plc, a single chip microcomputer, stm32, or the like.

Further, the motor may be a servo motor, a brushless motor, a brushed motor, a disc motor, or the like.

The working flow of the thermal cycle experimental device provided in this embodiment is as follows:

1. sample 001 is placed on sample tray 210, and locking screw 342 and locking body 233 are loosened to adjust the positions of connecting rod 220 and cover 230, respectively;

2. starting the heating furnace 100 and completing the preheating;

3. the control unit 400 is started, and the motor returns to zero;

4. setting time interval and starting motion control program. Under the action of the motion control program, the execution unit 200 performs ascending and descending actions according to a set time interval;

5. after the set time interval is reached, the positioning unit 300 sends the sample 001 into the heating furnace 100, and after the sealing cover 230 seals the inlet 120, the positioning unit 300 stops moving;

6. after reaching the time interval again, the positioning unit 300 drives the continuous execution unit 200 to move upwards, so that the sample 001 leaves the heating furnace 100; when the sample tray 210 leaves the heating furnace 100 and the insulating cover 240 closes the inlet 120, the positioning unit 300 stops moving;

7. during the experiment, an experimenter can observe the whole experiment process through the observation window 130;

8. after the experiment is finished, the heating furnace 100 is powered off, the control unit 400 is powered down, and the motor band-type brake prevents the sliding block 332 from falling off.

In the process that the sample 001 is fed into the heating furnace 100, the sample tray 210 descends, three supporting rods 140 positioned in the heating furnace 100 respectively penetrate through three guide holes 212, and the sample 001 positioned in the sample tray 210 is jacked up, so that the sample 001 is basically in a suspended state, the sample 001 is uniformly heated, and the accuracy of experimental results is high.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A thermal cycling experimental device, comprising:

2. The thermal cycling experimental device according to claim 1, wherein:

the heating furnace is provided with an observation window for observing a sample located in the furnace chamber.

3. The thermal cycling experimental device according to claim 1, wherein:

the sealing cover is sleeved outside the connecting rod and is slidably matched with the connecting rod in the axial direction of the connecting rod; the sealing cover and the sample tray are arranged at intervals in the axial direction of the connecting rod.

4. A thermal cycling test device in accordance with claim 3, wherein:

the sealing cover comprises a fixed body, a sealing body and a locking body, wherein the sealing body is fixedly connected with the fixed body, and the sealing body and the fixed body are sleeved outside the connecting rod and are slidably matched with the connecting rod; the locking body is in threaded connection with the outside of the fixed body, the locking body is provided with a first position and a second position which are mutually switched, and when the locking body is positioned at the first position, the locking body is in abutting connection with the connecting rod so as to limit the relative sliding of the fixed body and the connecting rod; in the second position, the locking body is spaced from the connecting rod to allow the fixed body to slide relative to the connecting rod.

5. The thermal cycling experimental device according to claim 4, wherein:

the sealing body is arranged into a reducing structure, and the cross section area of the sealing body gradually increases from one end of the sealing body, which is close to the sample tray, to the other end.

6. The thermal cycling experimental device according to claim 1, wherein:

the regulating and controlling unit comprises a frame, a driver, a transmission mechanism and a connecting mechanism, wherein the driver is arranged on the frame and is connected with the connecting mechanism through the transmission mechanism, and the connecting mechanism is connected with the connecting rod; the driver is used for transmitting power to the connecting mechanism through the transmission mechanism so as to drive the connecting rod to move through the connecting mechanism.

7. The thermal cycling experimental device according to claim 6, wherein:

the driver is set as a motor, the transmission mechanism comprises a screw and a sliding block, the screw is fixedly connected with an output shaft of the motor, the sliding block is in threaded connection with the outside of the screw, the sliding block is slidably connected with the frame, and the sliding block and the frame are relatively fixed in the circumferential direction of the screw; the connecting mechanism is connected with the sliding block.

8. The thermal cycling experimental device according to claim 7, wherein:

the connecting rod is slidably connected with the connecting mechanism in the axial direction of the connecting rod.

9. The thermal cycling experimental device according to claim 8, wherein:

the connecting mechanism comprises a connecting column and a locking screw, the connecting column is connected with the sliding block, a clamping groove is formed in the end portion of the connecting column, the clamping groove is provided with two opposite groove walls, and the connecting rod is clamped in the clamping groove; the locking screw is in threaded connection with the connecting column, and the locking screw is used for enabling the two groove walls to be close to or far away from each other so as to enable the two groove walls to clamp or loosen the connecting rod.

10. The thermal cycling experimental device according to claim 1, wherein:

the execution unit further comprises a heat preservation cover, the heat preservation cover is connected with the connecting rod, the sample tray is located between the heat preservation cover and the sealing cover, and the heat preservation cover is used for sealing the inlet and the outlet when the sample tray leaves the furnace chamber.