Refrigeration environment box for Hopkinson bar experiment

Abstract

The refrigeration environment box comprises a box body, a box door, a camera and a refrigeration assembly, the box body is provided with a containing cavity with an opening in the front side, the containing cavity is used for containing a test piece, and the left side and the right side of the box body are further provided with via holes for a Hopkinson incident bar and a Hopkinson transmission bar to penetrate through; the box door is installed on the front side of the box body in a sliding mode in the vertical direction so as to have the closed state that the box door vertically moves upwards to close the containing cavity and the open state that the box door vertically moves downwards to open the containing cavity, and an observation window is arranged in the middle of the box door. The camera is positioned on the front side of the box body and is arranged corresponding to the observation window; the refrigerating assembly is arranged on the box body and used for refrigerating the containing cavity. When the box door is opened and closed, the occupied space is small, the camera does not need to be moved repeatedly, use is convenient, and the experiment efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material mechanical property testing, and in particular to a refrigeration environment box used for a Hopkinson bar experiment. Background Art

[0002] The traditional split Hopkinson bar is a one-dimensional stress wave theory that measures the dynamic mechanical parameters of materials through stress waves generated under high-speed impact. The study of the dynamic mechanical properties of materials under low-temperature environments is of great significance. Understanding the mechanical behavior of materials under low temperatures helps to predict and improve their performance and ensure the safety and reliability of structures. Secondly, low-temperature environments can significantly change the mechanical properties of materials, such as compression strength, tensile strength, fracture toughness, etc. The relevant evolution laws will be able to guide the selection and improvement of materials and develop new materials that are more suitable for low-temperature environments. Low-temperature research also has a driving effect on the development of basic science. It will reveal the relationship between its microstructure and mechanical behavior, deepen the understanding of the nature of materials, and study the dynamic mechanical properties of materials under low-temperature environments. It can not only meet actual engineering needs and improve the safety and reliability of engineering structures, but also contribute to the theoretical development of materials science and the research and development of new materials. Refrigeration environment boxes are usually used to test the mechanical properties of materials under low-temperature environments.

[0003] Patent CN208383632U discloses a low temperature environment box for a split Hopkinson pressure bar test device. It includes a box body with a door that opens downwards, a seal between the box body and the door; insulation materials are provided on each side of the box body and in the sandwich wall of the door; a liquid nitrogen input pipe is provided on the top of the box body, coaxial rod holes are opened on the left and right symmetrical sides of the box body, and a temperature sensor is provided on the box body below the right rod hole; and an observation window is provided on the door.

[0004] In order to obtain clearer images of the sample damage process during the test, a camera is generally set up near the observation window. However, the above-mentioned existing technology often requires repeated movement and readjustment of the camera position when opening and closing the door, which is inconvenient to use and affects the experimental efficiency. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and propose a refrigeration environment box for Hopkinson bar experiment, so as to solve the technical problems in the prior art that the position of the camera needs to be repeatedly moved and readjusted when opening and closing the door, which is inconvenient to use and affects the experimental efficiency.

[0006] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a refrigeration environment box for Hopkinson bar experiment, comprising: The box body is provided with a receiving cavity with a front opening, the receiving cavity is used for placing the test piece, and the left and right sides of the box body are also provided with through holes for the Hopkinson incident rod and the Hopkinson transmission rod to pass through; A box door, the box door is slidably mounted on the front side of the box body in a vertical direction, so as to have a closed state in which the box door moves vertically upward to close the accommodating cavity and an open state in which the box door moves vertically downward to open the accommodating cavity, and an observation window is provided in the middle of the box door; A camera, the camera being located at the front side of the box and arranged corresponding to the observation window; and A refrigeration component is arranged in the box body, and is used to cool the accommodating cavity.

[0007] In some embodiments, both left and right ends of the front side of the box body are provided with slide grooves extending in the vertical direction; Two sliding blocks are arranged on one side of the box door facing the box body, the two sliding blocks correspond to the two sliding grooves one by one, and the sliding blocks are slidably installed in the sliding grooves.

[0008] In some embodiments, a mounting groove is provided on the side of the sliding block facing the box body, a positioning brush is installed in the mounting groove, a positioning pad is provided at the bottom of the sliding groove, and the positioning brush fits tightly with the positioning pad so that the box door can stay at any position when moving vertically.

[0009] In some embodiments, the mounting groove extends through the slider in a vertical direction, and the positioning brush is located at an upper end of the mounting groove; A first stopper is provided at the upper end of the slide groove, and a second stopper is provided at the lower end of the slide groove. The second stopper corresponds to the mounting groove and its width is smaller than the width of the mounting groove. The first stopper and the second stopper are used to limit the positioning brush from leaving the slide groove in the vertical direction.

[0010] In some embodiments, brackets are provided on both the left and right sides of the accommodating cavity; The refrigeration environment box for the Hopkinson bar experiment also includes a tray, which is placed on the two brackets and is located below the through hole.

[0011] In some embodiments, the distance between the outer periphery of the tray and the side wall of the accommodating cavity is less than 0.5 mm.

[0012] In some embodiments, the refrigeration component includes a Freon refrigeration component and a liquid nitrogen refrigeration component. The Freon refrigeration component is arranged in the box body, the Freon refrigeration component is used to cool the accommodating cavity using Freon, the liquid nitrogen refrigeration component is connected to the accommodating cavity, and the liquid nitrogen refrigeration component is used to transport liquid nitrogen to the accommodating cavity.

[0013] In some embodiments, the box body is further provided with an interlayer located at the periphery of the accommodating cavity; The Freon refrigeration assembly comprises a compressor and a refrigeration pipe. The refrigeration pipe is arranged in a serpentine shape in the interlayer, and both ends of the refrigeration pipe are connected to the inlet and outlet of the compressor.

[0014] In some embodiments, the liquid nitrogen refrigeration assembly includes a liquid nitrogen tank, a delivery pipe and a flow valve, one end of the delivery pipe is connected to the liquid nitrogen tank, the other end of the delivery pipe extends into the accommodating cavity, and the flow valve is arranged on the delivery pipe to control the flow of the delivery pipe.

[0015] In some embodiments, the refrigeration environment box for the Hopkinson rod experiment also includes a temperature sensor and a control device. The temperature sensor is arranged in the accommodating cavity and is used to detect the temperature in the accommodating cavity. The control device is electrically connected to the temperature sensor, the flow valve and the compressor respectively. The control device is used to control the opening degree of the flow valve and the power of the compressor according to the temperature in the accommodating cavity.

[0016] Compared with the prior art, the refrigeration environment box for the Hopkinson bar experiment provided by the present invention, when in use, the box door is slid downward to open the accommodating cavity, and then the specimen is placed in the accommodating cavity, the Hopkinson incident rod and the Hopkinson transmission rod respectively extend into the accommodating cavity from the two through holes and act on the specimen, after the specimen is clamped, the box door is slid upward to close the accommodating cavity, the refrigeration component is started to refrigerate the accommodating cavity, when the temperature in the accommodating cavity reaches a set value, the camera can be turned on, the impact test of the specimen is performed by the Hopkinson incident rod and the Hopkinson transmission rod, and the crushing process of the specimen is recorded by the camera, the box door is slidably installed on the box body in the vertical direction, when the box door is opened and closed, the space occupied is small, and the equipment space utilization rate is higher, and when the box door is slid, there is no need to repeatedly move the position of the camera, it is easy to use, and the experimental efficiency is improved.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows with reference to the accompanying drawings. The specific implementation of the present invention is given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of a refrigeration environment box for a Hopkinson bar experiment provided by the present invention; Figure 2 yes Figure 1A left side cross-sectional view of the refrigerated environmental chamber used for the Hopkinson bar experiment; Figure 3 yes Figure 1 Rear cutaway view of the refrigerated environmental chamber used for the Hopkinson bar experiment; Figure 4 yes Figure 1 A left sectional view of the first U-shaped groove and the slider portion; Figure 5 yes Figure 1 A top view of the first U-shaped groove and the slider portion.

[0019] Description of reference numerals: 1-box body, 11-accommodating cavity, 12-through hole, 13-first U-shaped groove, 131-slide groove, 14-positioning pad, 15-first stopper, 16-second stopper, 17-bracket, 18-Hopkinson incident rod, 19-Hopkinson transmission rod, 2-box door, 21-slider, 211-installation groove, 22-positioning brush, 23-observation window, 3-camera, 4-Freon refrigeration assembly, 41-compressor, 42-refrigeration pipe, 5-liquid nitrogen refrigeration assembly, 51-liquid nitrogen tank, 52-hose, 53-hard pipe, 6-tray, 7-temperature sensor, 8-installation assembly, 81-installation pipe, 82-nut. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] In order to solve the technical problem in the prior art that the position of the camera often needs to be repeatedly moved and readjusted when opening and closing the door, which is inconvenient to use and affects the experimental efficiency, the present invention provides a refrigerated environment box for Hopkinson bar experiment, which occupies a small space and has a higher equipment space utilization rate. At the same time, when sliding the box door, there is no need to repeatedly move the position of the camera, which is easy to use and improves the experimental efficiency.

[0022] See also Figure 1 , Figure 1 Schematic diagram of the structure of a refrigeration environment box used for Hopkinson bar experiment in one embodiment of the present invention.

[0023] The present invention provides a refrigeration environment box for a Hopkinson bar experiment, comprising a box body 1, a box door 2, a camera 3 and a refrigeration assembly, wherein the box body 1 is provided with a accommodating cavity 11 with a front opening, the accommodating cavity 11 is used for placing a test piece, and the left and right sides of the box body 1 are also provided with through holes 12 for passing a Hopkinson incident rod 18 and a Hopkinson transmission rod 19; the box door 2 is slidably installed on the front side of the box body 1 along the vertical direction, so as to have a closed state in which the accommodating cavity 11 is closed by vertically moving upward and an open state in which the accommodating cavity 11 is closed by vertically moving downward, and an observation window 23 is provided in the middle of the box door 2; the camera 3 is located at the front side of the box body 1 and is arranged corresponding to the observation window 23; the refrigeration assembly is arranged on the box body 1, and the refrigeration assembly is used to cool the accommodating cavity 11.

[0024] In this example, see Figures 1 to 3 When in use, the box door 2 is slid downward to open the accommodating chamber 11, and then the specimen is placed in the accommodating chamber 11. The Hopkinson incident rod 18 and the Hopkinson transmission rod 19 extend into the accommodating chamber 11 from the two through holes 12 respectively, and act on the specimen. After the specimen is clamped, the box door 2 is slid upward to close the accommodating chamber 11, and the refrigeration component is started to refrigerate the accommodating chamber 11. When the temperature in the accommodating chamber 11 reaches the set value, the camera 3 can be turned on, and the impact test of the specimen is performed through the Hopkinson incident rod 18 and the Hopkinson transmission rod 19. The crushing process of the specimen is recorded by the camera 3. The box door 2 is slidably installed on the box body 1 in the vertical direction. When opening and closing the box door 2, the space occupied is small, and the equipment space utilization rate is higher. At the same time, when sliding the box door 2, there is no need to repeatedly move the position of the camera 3, which is convenient to use and improves the experimental efficiency.

[0025] In some embodiments, see Figures 4 to 5 The left and right ends of the front side of the box body 1 are both provided with a slide groove 131 extending in the vertical direction; the box door 2 is provided with two sliders 21 on the side facing the box body 1, and the two sliders 21 correspond to the two slide grooves 131 one by one, and the sliders 21 are slidably installed in the slide grooves 131.

[0026] In this embodiment, two first U-shaped grooves 13 are provided on the front side surface of the box body 1, and the two first U-shaped grooves 13 are arranged at the left and right ends. The first U-shaped groove 13 is extended in the vertical direction, and the first U-shaped groove 13 constitutes the sliding groove 131. The box door 2 is provided with two second U-shaped grooves on the side facing the box body 1, and the two second U-shaped grooves are arranged at the left and right ends, and correspond one to one with the two first U-shaped grooves 13. The second U-shaped groove constitutes the sliding block 21. The inner width of the first U-shaped groove 13 is adapted to the outer width of the second U-shaped groove, so that the second U-shaped groove can be clamped in the first U-shaped groove 13, and the second U-shaped groove can slide relative to the first U-shaped groove 13, thereby realizing the sliding installation of the box door 2.

[0027] Specifically, the length of the first U-shaped groove 13 is slightly greater than the height of the box body 1, and the upper end of the first U-shaped groove 13 is flush with the upper side surface of the box body 1, so that the lower end of the first U-shaped groove 13 protrudes from the lower side surface of the box body 1, and the length of the second U-shaped groove is the same as the height of the box door 2. Such an arrangement can ensure that the second U-shaped groove does not separate from the first U-shaped groove 13 when the box door 2 is in the open state.

[0028] Furthermore, the first U-shaped groove 13 is connected to the box body 1 by screws, and the second U-shaped groove is connected to the box door 2 by screws.

[0029] In some embodiments, see Figures 4 to 5 The slider 21 is provided with a mounting groove 211 on one side facing the box body 1, a positioning brush 22 is installed in the mounting groove 211, a positioning pad 14 is provided at the bottom of the slide groove 131, and the positioning brush 22 fits tightly with the positioning pad 14 so that the box door 2 can stay at any position when it moves vertically.

[0030] In this embodiment, since the box door 2 is installed to slide along the vertical direction, and the box door 2 needs to slide upward to close the accommodating chamber 11, in order to ensure that the box door 2 remains stationary after sliding to the set position, the space in the second U-shaped groove constitutes the installation groove 211, and the positioning brush 22 is rotatably installed in the installation groove 211 along the axis in the horizontal direction. A positioning pad 14 is provided at the bottom of the slide groove 131. The surfaces of the positioning brush 22 and the positioning pad 14 are relatively rough, and the positioning brush 22 fits tightly with the positioning pad 14. The friction force between the positioning brush 22 and the positioning pad 14 is greater than the gravity of the box door 2. In this way, the friction force between the positioning brush 22 and the positioning pad 14 can be used to offset the gravity of the box door 2, so that the box door 2 can stay at any position to realize the switching of the box door 2 between the open state and the closed state.

[0031] In some embodiments, see Figures 4 to 5 The mounting groove 211 extends through the slider 21 in the vertical direction, and the positioning brush 22 is located at the upper end of the mounting groove 211; a first stopper 15 is provided at the upper end of the slide groove 131, and a second stopper 16 is provided at the lower end of the slide groove 131, and the second stopper 16 corresponds to the mounting groove 211 and its width is smaller than the width of the mounting groove 211, and the first stopper 15 and the second stopper 16 are used to limit the positioning brush 22 from disengaging from the slide groove 131 in the vertical direction.

[0032] In this embodiment, since the box door 2 slides downward to open the accommodating chamber 11, in the open state, most of the slider 21 has slid out of the slide groove 131, and only the upper end of the slider 21 is still in the slide groove 131. In order to ensure the cooperation between the positioning brush 22 and the positioning pad 14, the positioning brush 22 is located at the upper end of the mounting groove 211. At the same time, in order to prevent the slider 21 from sliding out of the slide groove 131 upward or downward, the slide groove 131 A first stopper 15 is provided at the upper end, and the first stopper 15 can limit the slider 21 from sliding upward out of the slide groove 131. A second stopper 16 is provided at the lower end of the slide groove 131. The second stopper 16 is located in the middle of the slide groove 131 and its width is smaller than the width of the installation groove 211, so that the second stopper 16 can extend into the installation groove 211 to limit the positioning brush 22, thereby limiting the positioning brush 22 from sliding downward out of the slide groove 131.

[0033] In this embodiment, the first stopper 15 and the second stopper 16 are both detachably connected to the sliding groove 131 .

[0034] In this embodiment, in order to limit the slider 21 in the front-to-back direction, the width of the slide groove 131 is gradually reduced in the forward direction, and the width of the slider 21 is also gradually reduced in the forward direction, and the inclination rate of the slide groove 131 is consistent with that of the slider 21. In this way, the slider 21 can be limited to avoid slipping out of the slide groove 131.

[0035] In some embodiments, see Figure 3 , brackets 17 are provided on both sides of the accommodating cavity 11 ; the refrigeration environment box for the Hopkinson bar experiment also includes a tray 6 , the tray 6 is placed on the two brackets 17 , and the tray 6 is located below the through hole 12 .

[0036] During the impact test, a large amount of debris of the test piece will fall into the accommodating cavity 11, making it inconvenient to clean, and the debris may remain at other locations at the bottom of the accommodating cavity 11 or penetrate into the interior of the box body 1 through the gaps after melting, causing corrosion of some metal materials and a decrease in the refrigeration effect. Therefore, in this embodiment, the tray 6 is also provided at the bottom of the accommodating cavity 11. The tray 6 is placed on the bracket 17. The tray 6 can accommodate debris to prevent it from falling into the accommodating cavity 11. The tray 6 can effectively collect all debris of samples such as ice materials to ensure the cleanliness of the interior of the accommodating cavity 11. In addition, with the same number of test samples, the large-capacity tray 6 needs to be cleaned less frequently, thereby improving the work efficiency of testers in conducting repetitive tests.

[0037] In this embodiment, since the bracket 17 is a certain distance away from the bottom of the accommodating cavity 11 , the tray 6 is placed on the bracket 17 . In order to increase the capacity of the tray 6 , the middle portion of the tray 6 is recessed downward.

[0038] In some embodiments, the distance between the outer periphery of the tray 6 and the side wall of the accommodating cavity 11 is less than 0.5 mm.

[0039] In this embodiment, since the tray 6 is placed on the bracket 17, a gap is inevitably left between the tray 6 and the side wall of the accommodating cavity 11, and there is a risk of debris falling into the bottom of the accommodating cavity 11 through the gap. In order to minimize this risk, the distance between the outer periphery of the tray 6 and the side wall of the accommodating cavity 11 is less than 0.5 mm.

[0040] In some embodiments, see Figures 1 to 3 The refrigeration component includes a Freon refrigeration component 4 and a liquid nitrogen refrigeration component 5. The Freon refrigeration component 4 is arranged in the box body 1. The Freon refrigeration component 4 is used to cool the accommodating cavity 11 using Freon. The liquid nitrogen refrigeration component 5 is connected to the accommodating cavity 11. The liquid nitrogen refrigeration component 5 is used to transport liquid nitrogen to the accommodating cavity 11.

[0041] In this embodiment, the Freon refrigeration component 4 can use Freon to cool the accommodating cavity 11, and the liquid nitrogen refrigeration component 5 can cool the accommodating cavity 11 by conveying liquid nitrogen to the accommodating cavity 11. The refrigeration using liquid nitrogen has a fast refrigeration speed, but the cost is high, and it is difficult to ensure a stable low-temperature environment. The refrigeration using Freon has a good long-term constant temperature effect and a low price, but its refrigeration speed is slow. The present application adopts a mixed refrigeration method of Freon and liquid nitrogen, which can take into account the advantages of rapid refrigeration, stable temperature and good economy.

[0042] In this embodiment, the rear side of the box body 1 is also open, and two box doors 2 are provided. The two doors are movably installed on the front and rear sides of the box body 1 along the vertical direction.

[0043] In some embodiments, see Figures 1 to 3 The box body 1 is also provided with an interlayer located on the periphery of the accommodating cavity 11; the Freon refrigeration assembly 4 includes a compressor 41 and a refrigeration pipe 42, the refrigeration pipe 42 is arranged in a serpentine shape in the interlayer, and both ends of the refrigeration pipe 42 are connected to the inlet and outlet of the compressor 41.

[0044] In this embodiment, the four sides of the box body 1 are provided with interconnected interlayers, and the refrigeration pipe 42 is arranged in a serpentine shape in the interlayer. The refrigeration pipe 42 is filled with Freon, and the refrigeration of the accommodating cavity 11 is achieved through the compressor 41 and the refrigeration pipe 42.

[0045] It is understandable that Freon refrigeration is a prior art, and its related components are all prior art and will not be described in detail here.

[0046] In some embodiments, see Figures 1 to 3 The liquid nitrogen refrigeration assembly 5 includes a liquid nitrogen tank 51, a delivery pipe and a flow valve. One end of the delivery pipe is connected to the liquid nitrogen tank 51, and the other end of the delivery pipe extends into the accommodating cavity 11. The flow valve is arranged on the delivery pipe to control the flow of the delivery pipe.

[0047] In this embodiment, the delivery pipe includes a hose 52 and a hard pipe 53 connected in sequence, one end of the hose 52 is connected to the liquid nitrogen tank 51, and one end of the hard pipe 53 extends from top to bottom into the accommodating cavity 11 and is arranged corresponding to the specimen.

[0048] In some embodiments, see Figures 1 to 3 The refrigeration environment box for the Hopkinson rod experiment also includes a temperature sensor 7 and a control device. The temperature sensor 7 is arranged in the accommodating cavity 11 and is used to detect the temperature in the accommodating cavity 11. The control device is electrically connected to the temperature sensor 7, the flow valve and the compressor 41 respectively. The control device is used to control the opening degree of the flow valve and the power of the compressor 41 according to the temperature in the accommodating cavity 11.

[0049] In this embodiment, the temperature sensor 7 is located in the middle of the accommodating chamber 11 and is arranged corresponding to the test piece. The temperature sensor 7 can detect the temperature of the accommodating chamber 11 and transmit it to the control device. The control device can control the opening degree of the flow valve and the power of the compressor 41. When used specifically, in the initial state, the temperature of the accommodating chamber 11 is the same as the room temperature and the temperature is relatively high. At this time, liquid nitrogen is required to quickly cool down the accommodating chamber 11. At this time, the control device controls the flow valve to increase the flow of liquid nitrogen and reduce the power of the compressor 41, and uses the characteristics of liquid nitrogen to achieve the purpose of rapid cooling. When the temperature in the accommodating chamber 11 is close to the set value, there is no need to cool down quickly. It is necessary to cool down slowly and maintain a low temperature environment. The control device controls the flow valve to reduce the flow of liquid nitrogen and increase the work of the compressor 41, and uses the characteristics of Freon to achieve the characteristic of maintaining a constant temperature for a long time.

[0050] In an embodiment, the refrigeration environment box for the Hopkinson rod experiment also includes two mounting components 8, and the two mounting components 8 correspond one-to-one to the two through holes 12. Each mounting component 8 includes a mounting tube 81 and two nuts 82. The length of the mounting tube 81 is slightly greater than the depth of the through hole 12, and the outer diameter of the mounting tube 81 is the same as the diameter of the through hole 12. The mounting tube 81 is inserted into the through hole 12, and the outer periphery of the mounting tube 81 is provided with a thread, one of the nuts 82 is located in the accommodating cavity 11 and is threadedly connected to the mounting tube 81, and the other nut 82 is located outside the box body 1 and is threadedly connected to the mounting tube 81. The inner diameter of the mounting tube 81 is greater than the diameter of the Hopkinson incident rod 18 or the Hopkinson transmission rod 19 by 1-2 mm, which can not only ensure the free movement of the Hopkinson incident rod 18 and the Hopkinson transmission rod 19 in the two mounting tubes 81, but also effectively prevent the cold air in the accommodating cavity 11 from escaping.

[0051] In this embodiment, a sealing strip is further provided between the box door 2 and the box body 1 .

[0052] In order to better understand the present invention, the following Figures 1 to 5 The technical solution of the present invention is described in detail: When in use, the door 2 is slid downward to open the accommodating chamber 11, and then the specimen is placed in the accommodating chamber 11. The Hopkinson incident rod 18 and the Hopkinson transmission rod 19 extend into the accommodating chamber 11 from the two through holes 12 respectively and act on the specimen. After the specimen is clamped, the door 2 is slid upward to close the accommodating chamber 11, and the refrigeration component is started to cool the accommodating chamber 11. The temperature sensor 7 detects the temperature of the accommodating chamber 11 in real time. Initially, the temperature of the accommodating chamber 11 is high, and the control device controls the flow rate. The valve is used to increase the flow rate of liquid nitrogen and reduce the power of the compressor 41 at the same time, and the characteristics of liquid nitrogen are used to achieve the purpose of rapid cooling. When the temperature in the accommodating chamber 11 is close to the set value, the control device controls the flow valve to reduce the flow rate of liquid nitrogen and increase the work of the compressor 41 at the same time, and the characteristics of Freon are used to achieve the characteristic of maintaining a constant temperature for a long time. When the temperature in the accommodating chamber 11 reaches the set value, the camera 3 can be turned on, and the impact test of the specimen is performed through the Hopkinson incident rod 18 and the Hopkinson transmission rod 19, and the specimen crushing process is recorded through the camera 3.

[0053] The present application adopts a sideways downward sliding door 2, which has a higher equipment space utilization rate, makes it more convenient for testers to install and clean samples, and does not need to repeatedly adjust the position of the high-speed camera.

[0054] The present application installs a tray 6 at the bottom of the accommodating chamber 11, which can effectively collect all debris of samples such as ice materials to ensure the cleanliness of the interior of the box 1 at all times. In addition, under the same number of test samples, the large-capacity tray 6 requires less cleaning times, thereby improving the work efficiency of testers in conducting repetitive tests.

[0055] The present application adopts a mixed refrigeration method of Freon and liquid nitrogen, which can simultaneously take into account the advantages of rapid refrigeration, stable temperature and good economy.

[0056] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A refrigeration environment box for Hopkinson bar experiment, characterized in that: It includes: The box body is provided with a receiving cavity with a front opening, the receiving cavity is used for placing the test piece, and the left and right sides of the box body are also provided with through holes for the Hopkinson incident rod and the Hopkinson transmission rod to pass through; A box door, the box door is slidably mounted on the front side of the box body in a vertical direction, so as to have a closed state in which the box door moves vertically upward to close the accommodating cavity and an open state in which the box door moves vertically downward to open the accommodating cavity, and an observation window is provided in the middle of the box door; A camera, the camera being located at the front side of the box and arranged corresponding to the observation window; and A refrigeration component is arranged in the box body, and is used to cool the accommodating cavity.

2. The refrigeration environment box for the Hopkinson bar experiment according to claim 1, characterized in that: The left and right ends of the front side of the box body are provided with sliding grooves extending in the vertical direction; Two sliding blocks are arranged on one side of the box door facing the box body, the two sliding blocks correspond to the two sliding grooves one by one, and the sliding blocks are slidably installed in the sliding grooves.

3. The refrigeration environment box for the Hopkinson bar experiment according to claim 2, characterized in that: The sliding block is provided with an installation groove on one side facing the box body, a positioning brush is installed in the installation groove, a positioning pad is provided at the bottom of the sliding groove, and the positioning brush fits tightly with the positioning pad so that the box door can stay at any position when moving vertically.

4. The refrigeration environment box for the Hopkinson bar experiment according to claim 3, characterized in that: The mounting groove extends vertically through the slider, and the positioning brush is located at the upper end of the mounting groove; A first stopper is provided at the upper end of the slide groove, and a second stopper is provided at the lower end of the slide groove. The second stopper corresponds to the mounting groove and its width is smaller than the width of the mounting groove. The first stopper and the second stopper are used to limit the positioning brush from leaving the slide groove in the vertical direction.

5. The refrigeration environment box for Hopkinson bar experiment according to claim 1, characterized in that: Brackets are provided on both the left and right sides of the accommodating cavity; The refrigeration environment box for the Hopkinson bar experiment also includes a tray, which is placed on the two brackets and is located below the through hole.

6. The refrigeration environment box for Hopkinson bar experiment according to claim 5, characterized in that: The distance between the outer periphery of the tray and the side wall of the accommodating cavity is less than 0.5 mm.

7. The refrigeration environment box for Hopkinson bar experiment according to claim 1, characterized in that: The refrigeration assembly includes a Freon refrigeration assembly and a liquid nitrogen refrigeration assembly. The Freon refrigeration assembly is arranged in the box body, and is used to cool the accommodating cavity using Freon. The liquid nitrogen refrigeration assembly is connected to the accommodating cavity, and is used to transport liquid nitrogen to the accommodating cavity.

8. The refrigeration environment box for the Hopkinson bar experiment according to claim 7, characterized in that: The box body is also provided with an interlayer located at the periphery of the accommodating cavity; The Freon refrigeration assembly comprises a compressor and a refrigeration pipe. The refrigeration pipe is arranged in a serpentine shape in the interlayer, and both ends of the refrigeration pipe are connected to the inlet and outlet of the compressor.

9. The refrigeration environment box for the Hopkinson bar experiment according to claim 8, characterized in that: The liquid nitrogen refrigeration assembly includes a liquid nitrogen tank, a delivery pipe and a flow valve, one end of the delivery pipe is connected to the liquid nitrogen tank, the other end of the delivery pipe extends into the accommodating cavity, and the flow valve is arranged on the delivery pipe to control the flow of the delivery pipe.

10. The refrigeration environment box for Hopkinson bar experiment according to claim 9, characterized in that: The refrigeration environment box for the Hopkinson rod experiment also includes a temperature sensor and a control device. The temperature sensor is arranged in the accommodating cavity and is used to detect the temperature in the accommodating cavity. The control device is electrically connected to the temperature sensor, the flow valve and the compressor respectively. The control device is used to control the opening degree of the flow valve and the power of the compressor according to the temperature in the accommodating cavity.

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