Dewar structure and vibration test device

Abstract

The utility model provides a Dewar structure and a vibration test device, the Dewar structure comprises an outer cylinder, an inner cylinder and a cover plate, the outer bottom of the outer cylinder is connected with an outer cylinder flange, the top of the inner cylinder is connected with the top of the outer cylinder, a vacuum cavity is formed between the outer wall of the inner cylinder and the inner wall of the outer cylinder, and a clamping assembly is arranged in the inner cylinder and used for clamping a piece to be tested. A temperature sensor and a heating device are further arranged in the inner cylinder; the cover plate is detachably connected to the tops of the outer cylinder and the inner cylinder and provided with a liquid conveying opening and an exhaust opening. The Dewar structure is connected to a vibration table through an outer cylinder flange to form a vibration test box, a low-temperature working medium is input through a liquid conveying opening in a cover plate to evaporate and absorb heat to reduce the temperature in the inner cylinder so as to meet the extreme low-temperature requirement, and the temperature in the inner cylinder is increased through heating of a heating device so as to meet the extreme high-temperature requirement. Temperature monitoring is carried out based on the temperature sensor, accurate temperature control in a vibration test is achieved, and the requirement of a test piece to be tested for an extreme temperature environment is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to vibration test technical field especially relates to a dewar structure and vibration test device. BACKGROUND

[0002] Civilian electrical and electronic products, automobile and aircraft parts, and various components in rockets and spacecrafts, etc. may encounter periodic or random vibration during production, manufacturing, transportation and use, so modal test, vibration test such as vibration test need to be carried out before formal use to determine the structural strength, fatigue strength and working performance of the test piece.

[0003] For some test pieces with extreme working environment, such as aerospace product test pieces, vibration conditions may occur in complex environments, such as lunar lander in the moon surface in the exploration of the moon, the temperature is 127℃ in the day, and -183℃ at night, and various vibration conditions may occur under such great diurnal temperature difference. In order to fully detect the performance of the above product test pieces in service, the natural environment in which the above product works needs to be simulated, and a vibration test chamber capable of realizing rapid temperature rise and fall and temperature control is provided.

[0004] The existing vibration test chamber cannot meet the test requirements of the test piece on extreme temperature environment, especially on extreme low temperature environment. CONTENT OF THE UTILITY MODEL

[0005] The utility model provides a dewar structure and vibration test device to solve the defect that the conventional vibration test chamber in the prior art cannot meet the extreme temperature environment requirement of the test piece.

[0006] The utility model provides a dewar structure, including outer tube, inner tube and cover plate, wherein, outer tube outer bottom connection outer tube flange, the outer tube flange is used for connecting vibration table, the inner tube sets up in the outer tube, the inner tube top with the outer tube top is connected, the vacuum cavity is formed between the inner tube outer wall with the outer tube inner wall, the inner tube is provided with clamping assembly in, the clamping assembly is used for clamping test piece, temperature sensor and heating device are still provided in the inner tube, the cover plate can be detachably connected in the outer tube with the inner tube top, the cover plate is provided with infusion port and exhaust port.

[0007] According to the utility model provides a dewar structure, the outer tube inner bottom is fixed with support column, the inner tube outer bottom connection inner tube flange, the support column with the inner tube flange is connected to make the inner tube relative the outer tube form rigid fixing.

[0008] According to the utility model provides a dewar structure, the inner tube is provided with agitating mechanism, and the agitating mechanism is used for stirring to accelerate the internal heat exchange of the inner tube.

[0009] According to the utility model provides a kind of dewar structure, the agitating mechanism includes axial flow fan, the axial flow fan is connected driving shaft, the driving shaft is rotatably installed in bearing seat, the bearing seat is threaded in the cover plate, power motor is provided on the cover plate, the output shaft of the power motor is connected the driving shaft by shaft coupling, the power motor is externally covered with motor protective cover.

[0010] According to the utility model provides a kind of dewar structure, the exhaust port is KF flange interface, electromagnetic valve is provided in the infusion port;Handle and aviation plug are also symmetrically provided on the cover plate, the aviation plug is connected the temperature sensor and the heating device.

[0011] According to the utility model provides a kind of dewar structure, the temperature sensor has multiple, is evenly installed on the inner cylinder inner bottom, side wall and the surface of the test piece, the heating device includes multiple heating rods, multiple the heating rod is installed in the inner cylinder inner bottom and the surface of the test piece.

[0012] According to the utility model provides a kind of dewar structure, the clamping assembly includes two clamping tables that are oppositely arranged, the clamping table is fixed to the inner cylinder inner bottom, the clamping piece is movably threaded on two clamping tables, and the clamping pieces on the two clamping tables are one-to-one corresponding and oppositely arranged to clamp the test piece by the oppositely arranged clamping pieces.

[0013] The utility model provides a kind of vibration test device on the other aspect, including the dewar structure of any one described above and vibration table, the dewar structure is fixed to the vibration table by outer cylinder flange connection.

[0014] The dewar structure and vibration test device provided by the utility model, the outer cylinder, the inner cylinder and the cover plate form the dewar structure, the dewar structure is connected to the vibration table by the outer cylinder flange of outer cylinder bottom, to form vibration test test box, the temperature inside the inner cylinder is reduced by inputting cryogen evaporation heat absorption through infusion port on cover plate, to meet extreme low temperature requirement, the temperature inside the inner cylinder is increased by heating to meet extreme high temperature requirement, temperature monitoring is carried out based on temperature sensor, to realize the accurate control of temperature in vibration test test.The utility model forms vibration test test box by connecting the dewar structure to the vibration table, and the extreme temperature environment requirement of test piece to be tested can be met by accurate control of the temperature inside the inner cylinder, to realize vibration test in-233~200 ℃ temperature range. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described in the following are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0016] Figure 1 It is the internal structure schematic diagram of the Dewar structure provided by the present application.

[0017] Figure 2 It is the isometric structure schematic diagram of the Dewar structure provided by the present application.

[0018] Figure 3 It is the explosion structure schematic diagram of the Dewar structure provided by the present application.

[0019] The drawings are as follows: 1, outer cylinder; 2, outer cylinder flange; 3, inner cylinder; 4, clamping assembly; 5, temperature sensor; 6, heating device; 7, cover plate; 8, infusion port; 9, exhaust port; 10, support column; 11, inner cylinder flange; 12, axial flow fan; 13, driving shaft; 14, bearing seat; 15, power motor; 16, shaft coupling; 17, motor protective cover; 18, handle; 19, aviation plug; 20, test piece. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the present application will be described clearly and completely in the following combined with the drawings in the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0021] In the description of the embodiments of the present application, it should be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0022] In the description of the embodiments of the utility model, it needs to explain, unless another explicit stipulation and limit, the term "link", "connect" should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integral connection, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through the intermediate medium. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the embodiments of the utility model can be understood according to specific circumstances.

[0023] In the embodiments of the utility model, unless another explicit stipulation and limit, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or just indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or just indicate that the horizontal height of the first feature is less than that of the second feature.

[0024] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present application and the features of different embodiments or examples without contradiction.

[0025] The following will be described in detail Figures 1 to 3 The utility model discloses a dewar structure and vibration test device.

[0026] One embodiment of the utility model provides a dewar structure, which is combined with Figure 1 And Figure 3 As shown in the figure, the dewar structure comprises an outer cylinder 1, an inner cylinder 3 and a cover plate 7, wherein the outer cylinder 1 is connected with an outer cylinder flange 2 at the bottom, and the outer cylinder flange 2 is used for connecting a vibration table; the inner cylinder 3 is arranged in the outer cylinder 1, the top of the inner cylinder 3 is connected with the top of the outer cylinder 1, a vacuum cavity is formed between the outer wall of the inner cylinder 3 and the inner wall of the outer cylinder 1, a clamping assembly 4 is arranged in the inner cylinder 3, the clamping assembly 4 is used for clamping a test piece, a temperature sensor 5 and a heating device 6 are further arranged in the inner cylinder 3; the cover plate 7 is detachably connected with the top of the outer cylinder 1 and the inner cylinder 3, and a liquid inlet 8 and an exhaust port 9 are arranged on the cover plate 7.

[0027] It can be understood that the dewar structure of the embodiment can be connected to a vibration table through the outer cylinder flange 2 at the outer bottom of the outer cylinder 1 to form a vibration test test box, the outer cylinder 1, the inner cylinder 3 and the cover plate 7 form the dewar structure, the input of the low-temperature working medium evaporation heat through the infusion port 8 on the cover plate 7 realizes the reduction of the temperature inside the inner cylinder 3 to meet the extreme low-temperature requirement, the heating through the heating device 6 realizes the increase of the temperature inside the inner cylinder 3 to meet the extreme high-temperature requirement, the temperature monitoring based on the temperature sensor 5 realizes the accurate control of the temperature in the vibration test test. The dewar structure provided in the embodiment can be connected to a vibration table to form a vibration test test box, and the accurate control of the temperature inside the inner cylinder 3 can meet the extreme temperature environment requirement of the test sample to be tested, and realize the vibration test in the temperature range of-233~200℃.

[0028] In some embodiments of the dewar structure of the utility model, continuing to refer to Figure 1 It is shown that the support column 10 is fixed at the inner bottom of the outer cylinder 1, the inner cylinder flange 11 is connected to the outer bottom of the inner cylinder 3, and the support column 10 is connected with the inner cylinder flange 11 to make the inner cylinder 3 form rigid fixation relative to the outer cylinder 1.

[0029] The inner cylinder in the conventional dewar structure is in a suspended state, and the inner cylinder will shake in the vibration test. It can be understood that the dewar structure in the embodiment is different from the conventional dewar structure, in the embodiment, the inner and outer cylinders of the dewar structure are rigidly connected through the support column 10, which ensures the high vacuum of the sandwich and enhances the rigidity of the dewar, so that the structure can be stable to complete the test of the set vibration intensity, and in addition, the existence of the vacuum sandwich reduces the heat leakage in the low-temperature vibration test process and reduces the loss of the low-temperature working medium.

[0030] In some embodiments of the dewar structure of the utility model, an agitating mechanism is arranged in the inner cylinder 3, and the agitating mechanism is used for agitating and accelerating heat exchange inside the inner cylinder 3. In some specific examples, referring again to Figure 1 It is shown that the agitating mechanism comprises an axial flow fan 12, the axial flow fan 12 is connected with a driving shaft 13, the driving shaft 13 is rotatably installed on a bearing seat 14, the bearing seat 14 is arranged through the cover plate 7, a power motor 15 is arranged on the cover plate 7, an output shaft of the power motor 15 is connected with the driving shaft 13 through a shaft coupling 16, and a motor protective cover 17 is arranged outside the power motor 15.

[0031] It can be understood that during the evaporation and cooling of the low-temperature working medium filled in the inner cylinder 3, and during the temperature rise in the inner cylinder 3 by the heating device 6, the air flow in the inner cylinder 3 can be accelerated by the stirring mechanism in the example, rapid heat exchange is realized, the temperature distribution uniformity in the inner cylinder 3 is enhanced, and the temperature control accuracy is higher. Specifically, the power motor 15 is started, the rotating power is transmitted to the driving shaft 13 through the shaft coupling 16, the driving shaft 13 rotates on the bearing seat 14, and the shaft flow fan 12 in the inner cylinder 3 is driven to work, the rotation of the shaft flow fan 12 accelerates the heat exchange in the inner cylinder 3, so that the temperature distribution is more uniform.

[0032] The working strength of the shaft flow fan 12 needs to be related to the temperature in the inner cylinder 3. Based on the test temperature to be reached in the inner cylinder 3, the temperature in the inner cylinder 3 is monitored by the temperature sensor 5, and the working strength of the shaft flow fan 12 is adjusted according to the data monitored by the temperature sensor 5. It should be understood that during the low-temperature vibration performance test, the temperature in the inner cylinder 3 needs to be reduced, the flow of the low-temperature working medium input by the temperature sensor 5, the exhaust port 9, the speed of the exhaust port 9, and the working strength of the shaft flow fan 12 can be automatically controlled by the automatic control program (such as LabView). During the high-temperature vibration performance test, the temperature in the inner cylinder 3 needs to be increased, the temperature sensor 5, the heating device 6 and the working strength of the shaft flow fan 12 can also be automatically controlled by the automatic control program (such as LabView). Through the control of the automatic control program, the temperature in the Dewar structure can be changed according to the set temperature rising and falling rate, and can be kept stable at a certain temperature.

[0033] In some embodiments of the Dewar structure of the utility model, the exhaust port 9 is a KF flange interface, and an electromagnetic valve is arranged in the infusion port 8; during the low-temperature vibration performance test, the low-temperature working medium filled in the inner cylinder 3 is evaporated and cooled, at this time, the exhaust port 9 of the KF flange interface is connected with a gas collection system, the gas collection system provides a gas suction for the inner cylinder 3 through the exhaust port 9 to discharge the evaporated low-temperature working medium, so as to maintain a certain air pressure and avoid excessive internal air pressure. During the high-temperature vibration performance test, the temperature in the inner cylinder 3 needs to be increased, and while the heating device 6 is heated, normal temperature or high-temperature high-pressure nitrogen or helium can also be introduced into the inner cylinder 3 through the exhaust port 9, so that the temperature in the inner cylinder 3 can be quickly increased.

[0034] In some specific examples, see Figure 2As shown, the cover plate 7 is also symmetrically provided with a handle 18 and an aviation plug 19, the aviation plug 19 is connected with the temperature sensor 5 and the heating device 6, the aviation plug 19 realizes electrical signal connection inside and outside the vacuum, and the data signal of the temperature sensor 5 and the control signal of the heating device 6 can be output and input through the aviation plug. The handle 18 is used for opening or closing the cover plate 7, if the overall equipment size and weight are too large, the handle 18 can be designed in the form of an ear, and the cover plate 7 is lifted by a travelling crane.

[0035] In the inner cylinder 3, a plurality of temperature sensors 5 can be arranged, and the temperature sensors 5 are used for monitoring the environment temperature in the inner cylinder 3 and the temperature of the test piece, and the temperature sensors 5 can be installed on the inner bottom and the side wall of the inner cylinder 3, and after the test piece is loaded, the temperature sensors 5 also need to be fixed on the surface of the test piece. The heating device 6 is used for heating the inner environment temperature of the inner cylinder 3 during the high-temperature vibration performance test, and in some specific examples, the heating device 6 includes a plurality of heating rods, and the plurality of heating rods are installed on the inner bottom of the inner cylinder 3 and the surface of the test piece, and provide low-temperature reheat heat and high-temperature test heat.

[0036] In some embodiments of the Dewar structure of the utility model, the clamping assembly 4 is made of invar, the clamping assembly 4 includes two clamping tables opposite to each other, the clamping tables are fixed to the inner bottom of the inner cylinder 3, and clamping pieces are movably arranged on the two clamping tables, and the clamping pieces on the two clamping tables are correspondingly arranged and opposite to each other, so as to clamp the test piece through the opposite clamping pieces.

[0037] It can be understood that the clamping assembly 4 made of invar has a very low thermal expansion coefficient, which can not only ensure the rigidity connection strength with the inner cylinder 3, but also ensure the stability of fixing the test piece. When the test piece is installed, the test piece is placed between the two clamping tables, and then the opposite clamping pieces on the two clamping tables are adjusted at the same time. The clamping pieces can be fastening bolts, and the test piece is clamped and fixed through the opposite clamping pieces.

[0038] The utility model also provides a vibration test device, and in some embodiments, the vibration test device includes the Dewar structure in any one of the above embodiments or examples, and further includes a vibration table, and the Dewar structure is connected and fixed to the vibration table through the outer cylinder flange 2.

[0039] It can be understood that, since the vibration test device in the embodiment includes the above-mentioned Dewar structure, the vibration test device of the embodiment has the advantages of the above-mentioned Dewar structure. Through the vibration test device of the embodiment, the vibration test of the test piece in the extreme temperature range (-233~200℃) can be realized. The inner and outer cylinders of the Dewar are rigidly connected through a plurality of rigid support columns, which enhances the rigidity of the Dewar, and at the same time, the low heat conduction between the inner and outer cylinders of the Dewar is realized in combination with the vacuum cavity.

[0040] The vibration test method of the vibration test device comprises the following steps S1-S4.

[0041] S1, fix the test piece on the clamping assembly 4 of the inner cylinder 3, tightly cover the cover plate 7, and fix the Dewar structure to the vibration table through the outer cylinder flange 2.

[0042] Step S1 is the vibration test preparation stage. Before the vibration test, the cover plate 7 is lifted by the row of hangers, the test piece 20 is installed on the clamping assembly 4 and clamped, the normal work of the temperature sensor 5, the electromagnetic valve, the power motor 15, the axial flow fan 12 and the heating device 6 is tested, then the device cover plate 7 is tightly covered, the assembled Dewar structure is placed on the vibration table, the vibration table is connected through the hole position of the bottom outer cylinder flange 2, and the fixation of the Dewar structure and the vibration table is realized.

[0043] S2, spray the low-temperature working medium into the inner cylinder 3 through the infusion port 8 on the cover plate 7, so that the low-temperature working medium evaporates and absorbs heat to cool in the inner cylinder 3, the exhaust port 9 on the cover plate 7 is connected with the gas collection system, and the gaseous working medium after evaporation is collected; the temperature of the test piece is monitored through the temperature sensor 5, when the temperature of the test piece reaches the low-temperature test temperature and is stable, the spraying rate of the low-temperature working medium is adjusted to maintain the low-temperature test temperature of the test piece, the vibration table is started to test the low-temperature vibration performance, and the low-temperature vibration test parameters are recorded.

[0044] Step S2 is the low-temperature vibration performance test stage. The power motor 15 is started to open the axial flow fan 12, the temperature control program is opened, the low-temperature working medium is sprayed into the inner cylinder 3 at a set cooling rate and under the control of the electromagnetic valve, the inner cylinder 3 is quickly evaporated and cooled, the exhaust port 9 is connected with the gas collection system to avoid excessive internal pressure of the inner cylinder 3. The temperature of the test piece is monitored through the temperature sensor 5, and the vibration test is started after the temperature of the test piece reaches the test temperature and is stable.

[0045] S3, after the low-temperature vibration performance test is completed, stop spraying the low-temperature working medium, heat and warm up in the inner cylinder 3 through the heating device 6, monitor the temperature of the test piece through the temperature sensor 5, adjust the heating power of the heating device 6 when the temperature of the test piece reaches the high-temperature test temperature, maintain the high-temperature test temperature of the test piece, start the vibration table to test the high-temperature vibration performance, and record the high-temperature vibration test parameters.

[0046] Step S3 is a high-temperature vibration performance test phase, after the low-temperature vibration performance test is completed, the test temperature higher than room temperature needs to be quickly raised. At this time, the input of the liquid low-temperature working medium is stopped, and the heating device 6 is started. The rotation of the axial flow fan 12 will quickly spread the locally heated heat, and the overall temperature is uniformly increased. At the same time, normal temperature or high-temperature high-pressure nitrogen or helium is introduced into the air inlet (which can directly use the exhaust port 9) to quickly raise the temperature. After the high-temperature temperature is stable, the vibration test program is started.

[0047] S4, the low-temperature test temperature and the high-temperature test temperature are changed in turn, and the low-temperature vibration performance test at different low-temperature test temperatures and the high-temperature vibration performance test at different high-temperature test temperatures are repeatedly performed respectively. After the test is completed, the test piece is taken out, the appearance data of the test piece is observed and recorded, and the vibration test is completed.

[0048] Step S4 is to repeat the above steps S2 and S3 after changing the test temperature, and to perform low-temperature vibration performance tests and high-temperature vibration performance tests at different test temperatures. After a certain number of high-low temperature cycles are tested, the temperature is controlled to room temperature, the cover plate 7 is lifted to take out the test piece, the appearance of the test piece after vibration is observed and recorded, and the vibration test is completed.

[0049] It can be understood that the mechanical refrigeration method in the traditional vibration test provides small cooling capacity, slow cooling rate, and is not suitable for the working condition of loading vibration. The vibration test method of the embodiment uses the low-temperature working medium cooling and heating device to cooperate with the heating, uses the automatic control program (such as LabView) to control the low-temperature fluid flow valve, realizes the regulation and control of the low-temperature working medium flow, controls the heating rod current to control the heating amount, and the two control actions can make the temperature in the Dewar change according to the set temperature rising and falling rate, and keep stable at a certain temperature. Not only can the vibration test be effectively carried out under extreme temperature conditions, but also the accuracy and reliability of the test are improved through precise temperature control and stable vibration structure. At the same time, compared with the traditional mechanical refrigeration cooling, the cooling method of the embodiment reduces the weight of the overall Dewar structure, which is beneficial to loading and moving on the vibration table.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent substitutions for part of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A dewar structure, characterized by, The utility model relates to a vacuum vibration test device, including: The outer cylinder (1) bottom is fixed with the support column (10), the inner cylinder (3) outer bottom is connected with the inner cylinder flange (11), the support column (10) is connected with the inner cylinder flange (11), so that the inner cylinder (3) relative the outer cylinder (1) forms rigid fixing. The inner cylinder (3) is provided with the agitating mechanism, and the agitating mechanism is used for agitating and accelerating heat exchange inside the inner cylinder (3). The agitating mechanism includes an axial flow fan (12), the axial flow fan (12) is connected with a driving shaft (13), the driving shaft (13) is rotatably installed in a bearing seat (14), the bearing seat (14) is arranged in the cover plate (7), the cover plate (7) is provided with a power motor (15), the output shaft of the power motor (15) is connected with the driving shaft (13) through a shaft coupling (16), and the power motor (15) is externally covered with a motor protective cover (17).

2. The dewar structure of claim 1, wherein, The exhaust port (9) is a KF flange interface, the infusion port (8) is provided with an electromagnetic valve, the cover plate (7) is also symmetrically provided with a handle (18) and an aviation plug (19), the aviation plug (19) is connected with the temperature sensor (5) and the heating device (6).

3. The dewar structure of claim 1, wherein, The temperature sensor (5) has a plurality of, is installed on the inner bottom, the side wall and the surface of the test piece in the inner cylinder (3) evenly, and the heating device (6) includes a plurality of heating rods, and a plurality of the heating rods are installed on the inner bottom and the surface of the test piece in the inner cylinder (3).

4. The dewar structure of claim 3, wherein, The clamping assembly (4) includes two clamping tables oppositely arranged, the clamping tables are fixed to the inner bottom of the inner cylinder (3), the clamping pieces are movably arranged on the two clamping tables, and the clamping pieces on the two clamping tables are correspondingly arranged and oppositely arranged, so that the test piece is clamped by the oppositely arranged clamping pieces.

5. The dewar structure of claim 1, wherein, The utility model relates to a vacuum vibration test device, including:

6. The dewar structure of claim 1, wherein, The outer cylinder (1) bottom is fixed with the support column (10), the inner cylinder (3) outer bottom is connected with the inner cylinder flange (11), the support column (10) is connected with the inner cylinder flange (11), so that the inner cylinder (3) relative the outer cylinder (1) forms rigid fixing.

7. The Dewar structure according to any one of claims 1 to 6, characterized in that The inner cylinder (3) is provided with the agitating mechanism, and the agitating mechanism is used for agitating and accelerating heat exchange inside the inner cylinder (3).

8. A vibration testing apparatus, characterized by comprising: The agitating mechanism includes an axial flow fan (12), the axial flow fan (12) is connected with a driving shaft (13), the driving shaft (13) is rotatably installed in a bearing seat (14), the bearing seat (14) is arranged in the cover plate (7), the cover plate (7) is provided with a power motor (15), the output shaft of the power motor (15) is connected with the driving shaft (13) through a shaft coupling (16), and the power motor (15) is externally covered with a motor protective cover (17). The exhaust port (9) is a KF flange interface, the infusion port (8) is provided with an electromagnetic valve, the cover plate (7) is also symmetrically provided with a handle (18) and an aviation plug (19), the aviation plug (19) is connected with the temperature sensor (5) and the heating device (6). The temperature sensor (5) has a plurality of, is installed on the inner bottom, the side wall and the surface of the test piece in the inner cylinder (3) evenly, and the heating device (6) includes a plurality of heating rods, and a plurality of the heating rods are installed on the inner bottom and the surface of the test piece in the inner cylinder (3). The clamping assembly (4) includes two clamping tables oppositely arranged, the clamping tables are fixed to the inner bottom of the inner cylinder (3), the clamping pieces are movably arranged on the two clamping tables, and the clamping pieces on the two clamping tables are correspondingly arranged and oppositely arranged, so that the test piece is clamped by the oppositely arranged clamping pieces.

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