A freeze-thaw cycle temperature control model box for ice-rock avalanche initiation centrifugal experiments

Abstract

The present invention relates to the technical field of centrifugal experimental equipment for ice and rock avalanche initiation, and discloses a freeze-thaw cycle temperature control model box for ice and rock avalanche initiation centrifugal experiment, comprising a square box body, a box cover and a temperature control unit, wherein the square box body is used for a built-in model slope, the box cover is used for covering the top opening of the square box body, and the temperature control unit is embedded in the box cover; the side wall of the main viewing surface of the square box body is a transparent observation window, and a thin-walled tube in an inverted "J" shape is attached to the boundary between the left outer wall surface, the outer bottom surface and the right outer wall surface of the square box body and the transparent observation window from the main viewing angle, one end of the thin-walled tube is used for air intake, and the other end is used for air outlet, and a plurality of spaced-apart air vents are opened on the tube body, so that the air vents can be used to make the outer surface of the transparent observation window have circulating airflow movement, thereby preventing mist particles from being retained on the outer surface of the transparent observation window, thereby achieving a demisting effect.

Description

Technical Field

[0001] The invention belongs to the technical field of ice and rock avalanche initiation centrifugal experiment equipment, and in particular relates to a freeze-thaw cycle temperature control model box used for ice and rock avalanche initiation centrifugal experiment. Background Art

[0002] The widespread distribution of glacier-covered rock masses on my country's Qinghai-Tibet Plateau leads to complex engineering geological conditions. Furthermore, glacial rock and soil masses distributed on high-altitude slopes are highly susceptible to fracture and disintegration under the action of gravity, leading to disasters. Therefore, accurately understanding the initiation mechanism of glacial rock and soil masses under the influence of freeze-thaw cycles in high-altitude environments can facilitate effective disaster prevention and mitigation measures, making systematic research essential.

[0003] Centrifuge model experiments, as a technical means, play an irreplaceable role in clarifying disaster mechanisms. Based on the experimental objectives, designing and manufacturing a temperature-controlled device with freeze-thaw cycle capabilities that can meet the requirements of centrifuge experiments on ice and rock avalanche initiation is of great scientific significance.

[0004] Currently, most of the existing centrifuge experimental devices for rock and soil freeze-thaw cycle experiments are for loose soil. However, for the freeze-thaw cycle centrifuge experiments on rock, it is necessary to consider the bearing capacity of the bottom of the model box, making the existing centrifuge experimental devices unsuitable for ice and rock avalanche initiation centrifuge experiments. At the same time, the existing centrifuge experimental devices rarely take into account the problem of fogging of the transparent observation window during the centrifugation process in a low-temperature environment. This is extremely unfavorable for external industrial cameras to monitor the model inside the box, and it is difficult to obtain high-quality images for later result analysis and processing. In addition, based on different experimental schemes, the preset temperature range is also different. Therefore, it is necessary to control the temperature of the cooling / heating range in the model box to meet the experimental purpose. Under actual working conditions, the temperature of different parts of the model slope in the box may be different. If this condition is achieved during the centrifuge experiment, it may be more consistent with the prototype, which will help to obtain more accurate experimental results. Summary of the Invention

[0005] In order to solve the problem of fogging of the transparent observation window of the existing centrifugal experimental device in a low temperature environment and during the centrifugation process, the present invention aims to provide a freeze-thaw cycle temperature control model box for ice and rock avalanche initiation centrifugation experiment.

[0006] The present invention provides a freeze-thaw cycle temperature-controlled model box for ice and rock avalanche initiation centrifugation experiments, comprising a square box body, a box cover, and a temperature control unit, wherein the square box body is used to house a model slope, the box cover is used to cover the top opening of the square box body, and the temperature control unit is embedded in the box cover;

[0007] The inner bottom surface and inner wall surface of the square box body are evenly laid with cooling / heating pipes. When the box cover covers the square box body, the temperature control unit is connected to the cooling / heating pipes, so as to cool / heat the space inside the box through the cooling / heating pipes. The inner wall surface includes a left inner wall surface, a right inner wall surface, and a rear inner wall surface.

[0008] The side wall of the main viewing surface of the square box is a transparent observation window, and a thin-walled tube in the shape of an inverted "J" from the main viewing angle is attached to the boundaries of the left outer wall, outer bottom and right outer wall of the square box and the transparent observation window, wherein one end of the thin-walled tube is used for air intake and the other end is used for air outlet, and a number of air vents arranged at intervals are opened on the tube body.

[0009] Based on the above invention content, a temperature-controlled model box solution is provided that can prevent the transparent observation window from fogging up in a low-temperature environment and during the centrifugation process, namely, it includes a square box body, a box cover and a temperature control unit, wherein the square box body is used for a built-in model slope, the box cover is used to cover the top opening of the square box body, and the temperature control unit is embedded in the inside of the box cover; the side wall of the main viewing surface of the square box body is a transparent observation window, and a thin-walled tube in an inverted "J" shape is attached to the boundary between the left outer wall, outer bottom surface and right outer wall surface of the square box body and the transparent observation window from the main viewing angle, one end of the thin-walled tube is used for air intake, and the other end is used for air outlet, and a number of spaced-apart air vents are opened on the tube body, so that when air enters from one end and is discharged from the other end, the air vents can be used to make the outer surface of the transparent observation window have circulating airflow movement, so that the mist particles will not be retained on the outer surface of the transparent observation window, thereby achieving a demisting effect.

[0010] In one possible design, a lighting unit is further included, wherein the lighting unit uses an LED lamp with Bluetooth and / or WiFi wireless control function and is arranged on the inner bottom surface of the box cover;

[0011] The box cover is provided with a first through hole, and the power supply cable of the lighting unit is electrically connected to the power supply system outside the box after passing through the first through hole.

[0012] In a possible design, a platinum resistance temperature sensor is further included, wherein the platinum resistance temperature sensor is arranged on the left inner wall surface, the right inner wall surface or the rear inner wall surface of the square box;

[0013] A second through hole is provided on the box cover, and the communication cable of the platinum resistance temperature sensor is connected to the data collection system outside the box after passing through the second through hole.

[0014] In a possible design, a plurality of spaced apart ribbed steel bars are laid on the inner wall surface, wherein the ribbed steel bars are cold-rolled steel bars with a diameter of 25 to 35 mm.

[0015] In a possible design, the bottom of the square box is made of a stainless steel shell filled with C60 thermal insulation concrete.

[0016] In a possible design, a handle for assisting in moving the cover plate is welded on the top surface of the box cover and / or a plurality of detachable windows are opened.

[0017] In one possible design, the cover is a stainless steel shell filled with high-density polystyrene foam.

[0018] In one possible design, the temperature control unit includes a pressure switch, a solenoid valve, a micro compressor, a radiator, a controller, a vacuum pump, a starter and a liquid reservoir, wherein each pair of two communicating components of the temperature control unit are connected through a thin-walled copper tube.

[0019] In one possible design, a first circulation pipeline based on the cooling / heating pipeline is laid in the upper area of the inner wall surface, and a second circulation pipeline based on the cooling / heating pipeline is laid in the lower area of the inner wall surface and the inner bottom surface, wherein the first circulation pipeline is used to independently cool / heat the upper space in the box under the control of the temperature control unit, and the second circulation pipeline is used to independently cool / heat the lower space in the box under the control of the temperature control unit.

[0020] In a possible design, a heat-insulating rubber sponge is used to wrap the pipeline between the temperature control unit and the cooling / heating pipeline, wherein the heat-insulating rubber sponge is made of rubber and polyvinyl fluoride.

[0021] Beneficial effects of the above scheme:

[0022] (1) The present invention provides a temperature-controlled model box solution that can prevent the transparent observation window from fogging up during centrifugation under low-temperature conditions, namely, it includes a square box body, a box cover and a temperature control unit, wherein the square box body is used for a built-in model slope, the box cover is used for covering the top opening of the square box body, and the temperature control unit is embedded in the box cover; the side wall of the main viewing surface of the square box body is a transparent observation window, and a thin-walled tube in the shape of an inverted "J" in the main viewing angle is attached to the boundary between the left outer wall surface, the outer bottom surface and the right outer wall surface of the square box body and the transparent observation window, one end of the thin-walled tube is used for air intake and the other end is used for air outlet, and a plurality of spaced ventilation holes are opened on the tube body, so that when air enters from one end and is discharged from the other end, the ventilation holes can be used to make the outer surface of the transparent observation window have a circulating airflow movement, thereby preventing the mist particles from being retained on the outer surface of the transparent observation window, thereby achieving a defogging effect;

[0023] (2) By deploying adjustable light sources, image acquisition conditions can be improved, which is more conducive to the analysis of experimental results in the later stage;

[0024] (3) The design and application of reinforced steel bars and thermal insulation concrete can improve the overall strength of the box to meet the special requirements of the high-gravity centrifugal environment;

[0025] (4) By selecting materials with different thermal conductivity in different parts, heat loss can be reduced;

[0026] (5) The freeze-thaw cycle temperature control model box can achieve a stepped temperature difference in different parts of the box, ensuring the necessary conditions for the freeze-thaw cycle centrifugation experiment, and has the characteristics of reasonable structure, safety, and easy operation, which is convenient for practical application and promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 only 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 work.

[0028] Figure 1 It is a structural schematic diagram of a box cover and a temperature control unit in a freeze-thaw cycle temperature control model box provided by the present invention.

[0029] Figure 2 It is a schematic diagram of the main cross-sectional structure of a square box in a freeze-thaw cycle temperature control model box provided by the present invention.

[0030] Figure 3 It is a schematic diagram of the rear cross-sectional structure of a square box in a freeze-thaw cycle temperature control model box provided by the present invention.

[0031] Figure 4 It is a schematic diagram of the left side cross-sectional structure of a square box in a freeze-thaw cycle temperature control model box provided by the present invention.

[0032] Figure 5 It is a schematic diagram of the right side cross-sectional structure of a square box in a freeze-thaw cycle temperature control model box provided by the present invention.

[0033] Figure 6 The diagram is a schematic diagram of the cross-sectional structure of a square box in a freeze-thaw cycle temperature control model box provided by the present invention when viewed from above.

[0034] Figure 7 The diagram is a top view of the cross-sectional structure of a square box in a freeze-thaw cycle temperature control model box provided by the present invention.

[0035] Figure 8 It is a structural schematic diagram of the power supply cable being wrapped by galvanized metal movable screws in the freeze-thaw cycle temperature control model box provided by the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be noted that although the description of these embodiments is intended to help understand the present invention, it does not constitute a limitation of the present invention. The specific structural and functional details disclosed herein are merely intended to describe exemplary embodiments of the present invention. However, the present invention can be embodied in many alternative forms, and it should not be understood that the present invention is limited to the embodiments set forth herein.

[0037] It should be understood that although the terms first, second, etc. may be used herein to describe various objects, these objects should not be limited by these terms. These terms are merely used to distinguish one object from another. For example, a first object can be referred to as a second object, and similarly, a second object can be referred to as a first object without departing from the scope of the exemplary embodiments of the present invention.

[0038] It should be understood that the term "and / or" that may appear in this document is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may indicate three situations: A exists alone, B exists alone, or A and B exist at the same time. The term " / and" that may appear in this document describes another type of association object relationship, indicating that two relationships may exist. For example, A / and B may indicate two situations: A exists alone, or A and B exist at the same time. In addition, the character " / " that may appear in this document generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0039] Example 1

[0040] like Figures 1 to 8As shown, the freeze-thaw cycle temperature control model box provided in this embodiment and used for the ice and rock avalanche initiation centrifugation experiment includes but is not limited to a square box body 1, a box cover 2 and a temperature control unit 3, wherein the square box body 1 is used to build a model slope 100, the box cover 2 is used to cover the top opening of the square box body 1, and the temperature control unit 3 is embedded in the box cover 2; the inner bottom surface and inner wall surface of the square box body 1 are evenly laid with cooling / heating pipes 11, and the temperature control unit 3 is connected to the cooling / heating pipes 11 when the box cover 2 covers the square box body 1. So as to cool / heat the space inside the box through the cooling / heating pipe 11, wherein the inner wall surface includes the left inner wall surface, the right inner wall surface and the rear inner wall surface; the main viewing side wall of the square box body 1 is a transparent observation window 12, and a thin-walled tube 13 in the shape of an inverted "J" from the main viewing angle is attached to the boundary of the left outer wall surface, the outer bottom surface and the right outer wall surface of the square box body 1 and the transparent observation window 12, wherein one end of the thin-walled tube 13 is used for air intake and the other end is used for air outlet, and a number of spaced air vents 130 are provided on the tube body.

[0041] like Figures 1 to 7 As shown, in the specific structure of the freeze-thaw cycle temperature control model box, the square box body 1 and the box cover 2 are used to provide a closed space for the model slope 100 (which can be directly cast in the box or placed in the box after being manufactured outside the box) when the cover is closed, and the square box body 1 and the box cover 2 can be closed and sealed by conventional methods, for example, by means of a bolt structure and a sealing strip, wherein the sealing strip is preferably a heat-insulating magnetic sealing strip to ensure a heat-insulating sealing effect. The temperature control unit 3 can refer to the refrigeration principle of a refrigerator, and specifically utilize the refrigerant (such as R410A refrigerant) circulating in the cooling / heating pipe 11 to cool / heat the space inside the box, thereby achieving the purpose of freeze-thaw cycle. Specifically, the temperature control unit 3 includes but is not limited to a pressure switch 31, a solenoid valve 32, a micro compressor 33, a radiator 34, a controller 35, a vacuum pump 36, a starter 37 and a liquid reservoir 38, wherein the solenoid valve 32, the micro compressor 33, the radiator 34, the vacuum pump 36, the starter 37 and the liquid reservoir 38 are all conventional configurations of the temperature control system and are used for daily maintenance; the pressure switch 31 and the controller 35 are used to start the cooling / heating function as needed during the experiment; at the same time, in order to enhance the heat conduction efficiency, each pair of two communicating components of the temperature control unit is preferably connected by a thin-walled copper tube (i.e., a thin-walled tube made of copper material). For example, the solenoid valve 32 and the micro compressor 33 that need to be connected can be connected by a thin-walled copper tube. In addition, the temperature control unit 3 uses the box cover 2 as a carrier, and its components are preferably evenly arranged and welded to the inside of the box cover 2.

[0042] The cooling / heating pipe 11 is used to cool the space inside the box (the temperature of the refrigerant in the tube needs to be lower than the temperature of the environment outside the tube, and the temperature of the refrigerant in the tube is controlled by the temperature control unit 3 through the micro compressor 33 and other components) / heat (the temperature of the refrigerant in the tube needs to be higher than the temperature of the environment outside the tube) through the heat exchange principle between the refrigerant in the tube and the environment outside the tube; in order to improve the heat conduction efficiency, the cooling / heating pipe 11 preferably uses a thin-walled copper tube. The transparent observation window 12 is used to facilitate the camera outside the box to monitor and observe the model slope 100 in the box throughout the experiment; in order to achieve high strength, the transparent observation window 12 is preferably made of organic glass made of polymethyl methacrylate; further, in order to take safety into consideration, it can be thickened, that is, the thickness of the organic glass is set to about 30 mm. Figure 2 As shown, since the thin-walled tube 13 is in the shape of an inverted "J" from the main viewing angle, it can semi-enclose the transparent observation window 12. At the same time, through the specific design of the thin-walled tube 13, when air enters from one end and exits from the other end (the two ends can be flush with the upper surface of the box cover 2), the vent holes 130 can be used to create a circulating airflow on the outer surface of the transparent observation window 12, thereby preventing mist particles from being retained on the outer surface of the transparent observation window 12, thereby achieving a demisting effect. In order to maximize the air circulation effect, the opening direction of the vent holes 130 is preferably parallel to the outer surface of the transparent observation window 12 or inclined toward the outer surface of the transparent observation window 12. At the same time, the thin-walled tube 13 can specifically be a thin-walled copper tube, and the aperture of the vent holes 130 can be specifically designed to be 1 mm. In addition, the aforementioned cameras outside the box include but are not limited to ordinary cameras and / or high-speed cameras on the market, among which the ordinary cameras can be independently powered, and in order to observe the changing characteristics of the model slope 100 in detail, they can be fastened using full-threaded screws and aviation aluminum alloy clamps, so as to cooperate with the high-speed camera to achieve three-dimensional and multi-angle observation effects.

[0043] Preferably, a lighting unit 4 is also included, wherein the lighting unit 4 is an LED light with Bluetooth and / or WiFi wireless control function and is arranged on the inner bottom surface of the box cover 2; a first through hole 21 is opened on the box cover 2, and the power supply cable 41 of the lighting unit is electrically connected to the power supply system outside the box after passing through the first through hole 21. Figures 2-3As shown, the lighting unit 4 is used to provide lighting for experimental observation, so as to solve the problem of insufficient brightness inside the box affecting observation, and to improve the shooting frame rate and image quality of the camera outside the box. Since the lighting unit 4 adopts an LED (Light-Emitting Diode) lamp with Bluetooth and / or WiFi wireless control function, for example, an existing LED light source product produced by Philips (i.e., Philips) is used, the brightness and / or color temperature of the light source can be adjusted contactlessly through wireless control, thereby avoiding human disturbance to the model inside the box to the greatest extent. In addition, in order to ensure the heat insulation and sealing effect, preferably, the first through hole 21 is a threaded hole, and the power supply cable 41 is wrapped by a galvanized metal movable screw 210 that is threadedly matched with the threaded hole, as shown in FIG. Figure 8 As shown, when the galvanized metal movable screw 210 is inserted into the threaded hole, not only can the power supply cable 41 be sealed through the first through hole 21 , but the power supply cable 41 can also be locked and fixed.

[0044] Preferably, a platinum resistance temperature sensor 5 is further included, wherein the platinum resistance temperature sensor 5 is arranged on the left inner wall surface, the right inner wall surface or the rear inner wall surface of the square box body 1; a second through hole 22 is opened on the box cover 2, and the communication cable 51 of the platinum resistance temperature sensor 5 is connected to the data collection system outside the box after passing through the second through hole 22. Figures 2-3 As shown, the platinum resistance temperature sensor 5 is used to collect the real-time temperature of the space inside the box, so as to achieve the purpose of monitoring the temperature changes inside the box. The platinum resistance temperature sensor 5 can be specifically fixed to the inner wall surface with the help of a full-threaded screw, a flat washer, a spring washer, and an aviation aluminum alloy clamp; the data collection system can be specifically a centrifuge data acquisition system used in the ice and rock collapse starting centrifugation experiment. In addition, in order to ensure the heat insulation and sealing effect, preferably, the second through hole 22 is also a threaded hole, and the communication cable 51 is also wrapped by another galvanized metal movable screw that is threadedly matched with the threaded hole. In this way, the purpose of sealing the communication cable 51 through the second through hole 22 and locking and fixing the communication cable 51 can also be achieved.

[0045] Preferably, a plurality of spaced ribbed steel bars 14 are laid on the inner wall surface, wherein the ribbed steel bars 14 are cold-rolled steel bars with a diameter of 25 to 35 mm. Figures 4-6 As shown, the ribbed steel bars 14 can be arranged longitudinally or transversely. By designing the ribbed steel bars 14, the compressive strength of the entire box can be increased to meet the requirements of the hypergravity experiment. Cold rolled steel bars.

[0046] Preferably, the bottom of the square box 1 is made of a stainless steel shell filled with C60 thermal insulation concrete 15. Figures 2 to 5 As shown, the above design can meet the bottom compressive strength required by the centrifugal experiment, improve the bearing capacity, and further be suitable for the ice and rock avalanche initiation centrifugal experiment.

[0047] Preferably, a handle 23 for assisting in moving the cover plate is welded on the top surface of the box cover 2 and / or a plurality of detachable windows 24 are opened. Figure 1 As shown, there are two handles 23, which facilitate closing or opening the cover; there are four removable windows 24, which facilitate inspection or replacement of components inside the cover. In addition, the removable windows 24 can be made removable by means of threaded blind holes, screws, iron sheets, etc.

[0048] Preferably, the box cover 2 is made of a stainless steel shell filled with high-density polystyrene foam 25. Figure 1 As shown, the box cover 2 can be made of heat-insulating steel to reduce heat conduction with the outside of the box.

[0049] Preferably, the upper area of the inner wall is paved with a first circulation pipeline 111 based on the cooling / heating pipeline 11, and the lower area of the inner wall and the inner bottom are paved with a second circulation pipeline 112 based on the cooling / heating pipeline 11, wherein the first circulation pipeline 111 is used to independently cool / heat the upper space in the box under the control of the temperature control unit 3, and the second circulation pipeline 112 is used to independently cool / heat the lower space in the box under the control of the temperature control unit 3. Figures 2 to 5 As shown, when only the first circulation line 111 is activated, cooling / heating is limited to the upper portion of the model slope 100. When only the second circulation line 112 is activated, cooling / heating is limited to the lower portion of the model slope 100. This allows for temperature differences between different portions of the model slope 100, creating a temperature gradient within the chamber, which is more consistent with the prototype and facilitates more accurate experimental results. Furthermore, when both the first and second circulation lines 111, 112 are activated simultaneously, the temperature within the chamber can be kept essentially constant.

[0050] Preferably, for the pipeline between the temperature control unit 3 and the cooling / heating pipe 11, a heat-insulating rubber sponge is used for the pipeline outsourcing, wherein the heat-insulating rubber sponge is made of rubber and polyvinyl fluoride. Figure 1 and 5As shown, the inner circulation pipe connection end 61, the outer circulation pipe connection end 62, the inner circulation pipe outlet end 63 and the outer circulation pipe outlet end 64 for connecting the temperature control unit 3 with the cooling / heating pipe 11 can be wrapped by the heat-insulating rubber sponge to further reduce heat conduction with the outside world. Figure 1 and Figure 5 The inflation port 65 and the inflation port connection end 66 can also be wrapped by the heat-insulating rubber sponge to reduce heat conduction with the outside world.

[0051] In summary, the freeze-thaw cycle temperature control model box provided in this embodiment and used for ice and rock avalanche initiation centrifugation experiments has the following technical effects:

[0052] (1) This embodiment provides a temperature-controlled model box solution that can prevent the transparent observation window from fogging up during centrifugation under low-temperature conditions, namely, it includes a square box body, a box cover and a temperature control unit, wherein the square box body is used to house a model slope, the box cover is used to cover the top opening of the square box body, and the temperature control unit is embedded in the box cover; the side wall of the main viewing surface of the square box body is a transparent observation window, and a thin-walled tube in the shape of an inverted "J" in the main viewing angle is attached to the boundary between the left outer wall surface, the outer bottom surface and the right outer wall surface of the square box body and the transparent observation window, one end of the thin-walled tube is used for air intake and the other end is used for air outlet, and a plurality of spaced ventilation holes are opened on the tube body, so that when air enters from one end and is discharged from the other end, the ventilation holes can be used to make the outer surface of the transparent observation window have a circulating airflow movement, thereby preventing mist particles from being retained on the outer surface of the transparent observation window, thereby achieving a defogging effect;

[0053] (2) By deploying adjustable light sources, image acquisition conditions can be improved, which is more conducive to the analysis of experimental results in the later stage;

[0054] (3) The design and application of reinforced steel bars and thermal insulation concrete can improve the overall strength of the box to meet the special requirements of the high-gravity centrifugal environment;

[0055] (4) By selecting materials with different thermal conductivity in different parts, heat loss can be reduced;

[0056] (5) The freeze-thaw cycle temperature control model box can achieve a stepped temperature difference in different parts of the box, ensuring the necessary conditions for the freeze-thaw cycle centrifugation experiment, and has the characteristics of reasonable structure, safety, and easy operation, which is convenient for practical application and promotion.

[0057] Finally, it should be noted that the present invention is not limited to the aforementioned optional embodiments. Anyone can derive various other product forms based on the teachings of this invention. The aforementioned specific embodiments should not be construed as limiting the scope of protection of the present invention. The scope of protection of the present invention shall be determined by the claims, and the specification may be used to interpret the claims.

Claims

1. A freeze-thaw cycle temperature control model box for ice and rock avalanche initiation centrifuge experiment, characterized in that: The invention comprises a square box (1), a box cover (2) and a temperature control unit (3), wherein the square box (1) is used to house a model slope (100), the box cover (2) is used to cover the top opening of the square box (1), the box cover (2) is a stainless steel shell filled with high-density polystyrene foam (25), and the temperature control unit (3) is embedded in the box cover (2); The inner bottom surface and inner wall surface of the square box body (1) are evenly laid with cooling / heating pipes (11), and the temperature control unit (3) is connected to the cooling / heating pipes (11) when the box cover (2) covers the square box body (1), so as to cool / heat the space inside the box through the cooling / heating pipes (11), wherein the inner wall surface includes a left inner wall surface, a right inner wall surface and a rear inner wall surface; The side wall of the main viewing surface of the square box (1) is a transparent observation window (12), and a thin-walled tube (13) in the shape of an inverted "J" in the main viewing angle is attached to the boundary between the left outer wall, the outer bottom surface and the right outer wall of the square box (1) and the transparent observation window (12), wherein one end of the thin-walled tube (13) is used for air intake and the other end is used for air outlet, and a plurality of vent holes (130) arranged at intervals are opened on the tube body; A first circulation pipeline (111) based on the cooling / heating pipeline (11) is laid in the upper area of the inner wall surface, and a second circulation pipeline (112) based on the cooling / heating pipeline (11) is laid in the lower area of the inner wall surface and the inner bottom surface, wherein the first circulation pipeline (111) is used to independently cool / heat the upper space in the box under the control of the temperature control unit (3), and the second circulation pipeline (112) is used to independently cool / heat the lower space in the box under the control of the temperature control unit (3).

2. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that It also includes a lighting unit (4), wherein the lighting unit (4) uses an LED lamp with Bluetooth and / or WiFi wireless control function and is arranged on the inner bottom surface of the box cover (2); A first through hole (21) is provided on the box cover (2), and the power supply cable (41) of the lighting unit is electrically connected to the power supply system outside the box after passing through the first through hole (21).

3. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that It also includes a platinum resistance temperature sensor (5), wherein the platinum resistance temperature sensor (5) is arranged on the left inner wall surface, the right inner wall surface or the rear inner wall surface of the square box (1); A second through hole (22) is provided on the box cover (2), and the communication cable (51) of the platinum resistance temperature sensor (5) is connected to the data collection system outside the box after passing through the second through hole (22).

4. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that A plurality of spaced ribbed steel bars (14) are also laid on the inner wall surface, wherein the ribbed steel bars (14) are cold-rolled steel bars with a diameter between 25 and 35 mm.

5. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that: The bottom of the square box (1) is made of a stainless steel shell filled with C60 thermal insulation concrete (15).

6. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that: A handle (23) for assisting in moving the cover plate is welded on the top surface of the box cover (2) and / or a plurality of detachable windows (24) are provided.

7. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that: The temperature control unit (3) includes a pressure switch (31), a solenoid valve (32), a micro compressor (33), a radiator (34), a controller (35), a vacuum pump (36), a starter (37) and a liquid reservoir (38), wherein each pair of two communicating components of the temperature control unit are connected via a thin-walled copper tube.

8. The freeze-thaw cycle temperature control model box according to claim 1, characterized in that: For the pipeline between the temperature control unit (3) and the cooling / heating pipeline (11), a heat-insulating rubber sponge is used to outsource the pipeline, wherein the heat-insulating rubber sponge is made of rubber and polyvinyl fluoride materials.

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