CN113295517B - Hopkinson bar device for hydrate kinetic test - Google Patents
Hopkinson bar device for hydrate kinetic test Download PDFInfo
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- CN113295517B CN113295517B CN202110855697.0A CN202110855697A CN113295517B CN 113295517 B CN113295517 B CN 113295517B CN 202110855697 A CN202110855697 A CN 202110855697A CN 113295517 B CN113295517 B CN 113295517B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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Abstract
The application relates to the field of kinetic tests of hydrate samples, in particular to a Hopkinson bar device for the kinetic test of hydrates. The device at least comprises a low-temperature control device, a pressure lever system and a sample container, wherein the pressure lever system sequentially comprises an impact rod, an incident rod and a transmission rod from left to right, and the sample container is positioned between the incident rod and the transmission rod; the low-temperature control device comprises a cylinder body and a pipeline; a first through hole is formed in the first side wall of the cylinder body, and a second through hole is formed in the second side wall of the cylinder body; the first end of the pipeline is fixed on the first side wall and covers the first through hole, and the second end of the pipeline is fixed on the second side wall and covers the second through hole; the cylinder body is provided with a first cavity for containing a cooling object; the pipeline is provided with a second cavity for accommodating the sample container, the incident rod can penetrate into the second cavity from the first through hole, and the transmission rod can penetrate into the second cavity from the second through hole; the cooling object placed in the first cavity can transmit cooling capacity to the second cavity.
Description
Technical Field
The application relates to a Hopkinson bar device, in particular to a Hopkinson bar device for a hydrate kinetic test.
Background
The submarine landslide is the most direct one with the strongest activity and the greatest harmfulness among disaster factors influencing the geological environment safety of the marine land slope. The device can not only remold the geological environment of a land slope region, seriously damage important facilities such as an oil-gas development platform, an oil-gas pipeline, a submarine communication cable and the like, cause great difficulty to ocean engineering construction, but also cause sea waves and tsunamis, and cause serious environmental climate change and life and property loss. The inducing mechanism of the seabed landslide is extremely complex, different scholars carry out statistical analysis and conclude that the inducing factors comprise earthquake and fault action, sedimentation rate, gas hydrate decomposition, waves, tides, human activities, erosion, magma volcanoes, mud volcanoes, salt diapir, creep, tsunami, sea level fluctuation, glacier action, wave current scouring, erosion action and the like. Despite many factors leading to seafloor landslide, in recent years, it has been discovered that triggering of giant seafloor landslide is closely related to earthquake and seafloor hydrate decomposition, and exploration of the kinetic properties of hydrate deposits is crucial to deeply understanding the triggering mechanism of such landslide.
Methane hydrate (natural gas hydrate) is the most existing hydrate in nature, and most methane hydrate is exploited at present, but the occurrence condition of the methane hydrate is below-20 ℃, so that a physical mechanical experiment is difficult to perform. The mechanical property of Tetrahydrofuran (THF) is close to that of methane hydrate, the existence environment is friendly, namely the THF can be kept stable under the atmospheric pressure environment with the temperature lower than 5 ℃, and the THF is usually used for replacing the methane hydrate to carry out mechanical experiments.
The hydrate frequently occurs in seabed and moving soil of the main occurrence environment, and the research on the dynamic characteristics of the hydrate has important scientific and economic values. In order to research the seismic response and stability of the hydrate, the deformation and strength characteristics of the hydrate under the action of power must be researched, but the dynamic characteristics of the hydrate are not researched due to the limitation of instruments. The Hopkinson bar test device is equipment for researching the deformation, damage and strength characteristics of materials under the action of dynamic load, has the advantages of simplicity in operation, convenience in measurement and the like, and is widely applied to the dynamic mechanical property test research of the materials.
However, the existing hopkinson rod cannot meet the low-temperature requirement, so how to test the dynamic property of the hydrate in a low-temperature environment by using the hopkinson rod is a key technical problem to be solved in the field.
Disclosure of Invention
The embodiment of the specification provides a Hopkinson bar device for a hydrate kinetic test, and in the process of carrying out the kinetic test on the hydrate by using the Hopkinson bar provided by the scheme, a corresponding low-temperature environment can be provided for a hydrate sample, so that the hydrate is tested in the low-temperature environment, and more accurate test data can be obtained.
The embodiment of the specification adopts the following technical scheme:
the Hopkinson bar device for the hydrate dynamics test provided by the embodiment of the specification at least comprises a low-temperature control device, a pressure bar system and a sample container, wherein the pressure bar system sequentially comprises a striker bar, an incident bar and a transmission bar from left to right, and the sample container is positioned between the incident bar and the transmission bar;
the low temperature control device includes: a cylinder body with an opening at the upper end and a pipeline with openings at two ends;
a first through hole is formed in a first side wall of the cylinder body, and a second through hole is formed in a second side wall, opposite to the first side wall, of the cylinder body;
the first end of the pipeline is fixed on the first side wall and covers the first through hole, and the second end of the pipeline is fixed on the second side wall and covers the second through hole;
the cylinder body is provided with a first cavity, and the first cavity is used for containing a cooling object; the pipeline is provided with a second cavity, the second cavity is used for accommodating the sample container, the incident rod can penetrate into the second cavity from the first through hole, and the transmission rod can penetrate into the second cavity from the second through hole; and the number of the first and second groups,
the cooling object placed in the first cavity can transfer cold energy to the second cavity, so that the ambient temperature in the second cavity reaches a preset temperature, and a preset temperature environment is provided for the sample in the sample container.
In an optional scheme, the diameter of the first through hole and the diameter of the second through hole are both larger than the diameter of the incident rod and the diameter of the transmission rod, and in the Hopkinson rod test process, the incident rod and the transmission rod are not in contact with the inner wall of the second cavity.
In an optional aspect, the hopkinson bar apparatus further comprises: the first heat-insulation plate and the second heat-insulation plate;
the first heat-preservation plate is attached to the outer side of the first side wall and covers the first through hole; the second insulation board is attached to the outer side of the second side wall and covers the second through hole;
the first heat preservation plate is provided with a first hollow, and the diameter of the first hollow is slightly larger than that of the incident rod, so that the incident rod can sequentially penetrate through the first hollow and the first through hole; the second insulation board is provided with a second hollow, and the diameter of the second hollow is slightly larger than that of the transmission rod, so that the transmission rod can sequentially penetrate through the second hollow and the second through hole.
In an alternative scheme, the inner side wall of the first hollow is coated with a lubricant, and the incident rod is in contact with the lubricant during the process that the incident rod passes through the first hollow;
the inner side wall of the second hollow cavity is coated with a lubricant, and the transmission rod is in contact with the lubricant in the process of passing through the second hollow cavity;
under the condition that the incident rod and the transmission rod respectively penetrate through the first hollow hole and the second hollow hole, the first heat-preservation plate and the second heat-preservation plate can enable the second cavity to form a closed state.
In an alternative scheme, the surface of the incident rod and the surface of the transmission rod are coated with lubricant; and/or the first heat-insulation plate and the second heat-insulation plate are both foam plates, and the thickness of each foam plate is 0.5-1.5 cm.
In an optional aspect, the hopkinson bar apparatus further comprises:
a temperature sensor for monitoring an ambient temperature within the second cavity;
the alarm can receive the temperature data sent by the temperature sensor and sends out alarm reminding when the temperature data is higher than a preset temperature.
In an optional scheme, a storage bin is arranged in the second cavity and used for placing dry ice so as to rapidly reduce the ambient temperature in the second cavity.
In an alternative embodiment, the cooling substance is an ice-water mixture.
In an optional scheme, the hopkinson bar device further comprises a plurality of ice bags for containing ice cubes, so that the ice cubes can be placed in the ice bags in the ice-water mixture contained in the first cavity.
In an optional scheme, the cylinder body is made of transparent materials;
and/or the pipeline is made of transparent materials.
The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects: this hopkinson pole device that this specification provided is provided with low temperature control device, this low temperature control device comprises cylinder body and pipeline, simple structure not only, practice thrift a large amount of costs, and easy and simple to handle when using, only need penetrate the second cavity of pipeline with incident pole and transmission pole in, utilize the cold volume that the ice-water mixture in the first cavity produced, for providing 0 ℃ of ambient temperature in the second cavity, thereby make the dress appearance container that is located the second cavity in 0 ℃ of the environment, and then guarantee that the sample in the dress appearance container can test under suitable temperature, improve experimental accuracy. In addition, the hopkinson pole device of this specification can also prevent that the cold volume in the second cavity from running off through the mode that increases the heated board (can select the heated board of suitable thickness according to actual need). The temperature in the second cavity can be monitored in real time by adding a temperature sensor and an alarm so as to remind a tester of the temperature condition in the second cavity. After the use, can directly collect the low temperature control device of hopkinson pole device, this low temperature control device can be along with putting along with getting, taking along with putting promptly, brings very big facility for the experimenter.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the specification, and other drawings can be obtained by those skilled in the art without creative efforts according to the drawings:
fig. 1 is a schematic view of an overall structure of a hopkinson rod device provided in an embodiment of the present specification, in which a low-temperature control device is omitted;
fig. 2 is a schematic structural diagram of a first view angle of a cryogenic control device of a hopkinson rod device provided in an embodiment of the present specification;
fig. 3 is a top view of a cryogenic control device of a hopkinson rod device provided in an embodiment of the present description;
fig. 4 is a perspective view of a cryogenic control device of a hopkinson rod device provided in an embodiment of the present specification (a sample container is omitted).
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments of the present disclosure, shall fall within the scope of protection of the present application.
Referring to fig. 1, fig. 1 is a schematic view of an overall structure of a hopkinson bar device provided in an embodiment of the present specification. As shown in fig. 1, the hopkinson bar apparatus of the present specification mainly includes: a cryogenic control device (not shown in fig. 1 and described in detail below), a plunger system 100 and a sample container 200, as well as a measurement system and a data processing system. The compression bar system 100 comprises a striking bar 101, an incident bar 102 and a transmission bar 103 from left to right, and the sample container 200 is located between the incident bar 102 and the transmission bar 103 and is used for containing a test sample, such as a hydrate sample for performing a kinetic test.
In testing a test sample in a sample container using a hopkinson bar, the main functions of the compression bar system 100 are: the impact rod 101 impacts the incident rod 102 under high-pressure acting force, and the high-pressure acting force can enter the air chamber 302 from the high-pressure air inlet 301 on the left side in fig. 1 and then is transmitted to the impact rod 101, so that the impact rod 101 impacts the incident rod 102; the impact force of the incident rod 102 acts on the sample container 200 (the test sample is placed in the sample container 200), and the impact force is transmitted to the transmission rod 103 and further transmitted to the capacity absorbing barrier 303 on the right side of fig. 1. Thus, the impact force applied to the sample container 200 between the incident rod 102 and the transmission rod 103 is transmitted to the test sample in the sample container 200, and the test data of the test sample is obtained.
More specifically, during the test of the test sample, the measurement system is used to collect the measurement data during the test, for example, the pressure value of the gas chamber 302 can be measured by the pressure gauge 304 in fig. 1, and the data measurement can be realized by installing a corresponding waveform shaper 305, a strain gauge 306, a wheatstone bridge 307, an oscilloscope 308 on the pressure system. The data processing system processes the data during the test to learn the dynamic compression characteristics of the test sample.
The principle of the hopkinson bar is summarized above, and the main structure and function of the hopkinson bar in the present specification are already understood by those skilled in the art, and the detailed description of the principle of the hopkinson bar is omitted here.
It should be noted that the sample container of the hopkinson rod device can contain rock samples, sand samples, hydrate samples and the like, and the hopkinson rod device can be used for testing the hydrate samples. As described in the background art, in consideration of the requirement of the occurrence environment of the hydrate, in the process of performing a kinetic test on the hydrate by using a hopkinson rod device, in order to ensure the accuracy of the test, the present specification provides a hopkinson rod device for the kinetic test of the hydrate. The low-temperature control device of the hopkinson bar device provided in the present specification is mainly described in detail below with reference to specific drawings.
2-4, fig. 2 is a schematic structural diagram of a first view angle of a low-temperature control device of a hopkinson rod device provided in an embodiment of the present specification; fig. 3 is a top view of a cryogenic control device of a hopkinson rod device provided in an embodiment of the present description; fig. 4 is a perspective view of a cryogenic control device of a hopkinson rod device provided in an embodiment of the present specification (a sample container is omitted).
As shown in fig. 2 to 4, the low temperature control apparatus of the present embodiment mainly includes a cylinder 1 and a pipe 2. The cylinder body 1 is a structure which is enclosed by a bottom surface and four side walls and has an upper end opening, and is provided with a first cavity 10, and the first cavity 10 is enclosed by the bottom surface and the four side walls. More specifically, a first through hole 111 is provided on a first side wall 11 of the cylinder block 1, and a second through hole 121 is provided on a second side wall 12 of the cylinder block 1 opposite to the first side wall 11. That is, the cylinder body 1 has four side walls, two through holes are respectively formed in two of the side walls, the two side walls may be two side walls which are oppositely arranged, and the two through holes may have the same shape and are arranged in mirror symmetry.
The duct 2 may be a structure open at both ends, inside which the second cavity 20 is formed. A first end (a left end of the pipeline 2 in fig. 2) of the pipeline 2 is fixed on the first side wall 11 of the cylinder body 1 and covers the first through hole 111; the second end of the pipe 2 (the right end of the pipe 2 in fig. 2) is fixed to the second sidewall 12 of the cylinder 1 and covers the second through hole 121. As an example, the opening shape and size of the first end may match the shape and size of the first through hole 111, and the opening shape and size of the second end may match the shape and size of the second through hole 121. In this way, the pipe 2 passes through the first side wall 11 and the second side wall 12 of the cylinder 1 in sequence, so that a through channel is formed on the cylinder 1, wherein the distance from the inner side of the first side wall 11 to the inner side of the second side wall 12 can be equal to the length of the pipe 2, that is, both ends of the pipe 2 do not pass through the through holes on both side walls of the cylinder 1. In a specific practice, a person skilled in the art can choose whether to let the first end of the conduit 2 pass from the first through hole 111 of the first side wall 11 to the outside of the cylinder 1 and whether to let the second end of the conduit 2 pass from the second through hole 121 of the second side wall 12 to the outside of the cylinder 1 according to actual needs.
The first cavity 10 of the cylinder 1 is used for containing a cooling object, such as an ice-water mixture. The second cavity 20 of the tube 2 is used for accommodating the sample container 200, and the incident rod 102 can penetrate into the second cavity 20 from the first through hole 111, and the transmission rod 103 can penetrate into the second cavity 20 from the second through hole 121. That is, when the low temperature control device provided in the present specification is used in the hopkin bar test, the low temperature control device corresponds to a region enclosed by a dashed line in fig. 1. Specifically, referring to fig. 4, fig. 4 corresponds to a partial view of fig. 1 in which the low temperature control device is inserted in the dashed-line frame region, wherein the incident rod 102 penetrates the second cavity 20 from the first through hole 111, the transmission rod 103 penetrates the second cavity 20 from the second through hole 121, and a sample container is disposed between the incident rod 102 and the transmission rod 103 (the sample container is omitted in fig. 4). Thus, since the first cavity 10 contains the cooling object, for example, the ice-water mixture, the temperature of the ice-water mixture is about 0 ℃, and the cold energy of the ice-water mixture can be transferred into the second cavity 20, so that the ambient temperature in the second cavity 20 also reaches about 0 ℃, and since the sample container 200 is located in the second cavity 20, the temperature in the sample container 200 is the same as the ambient temperature in the second cavity 20 (i.e., also reaches about 0 ℃), at this time, the hydrate sample can be placed into the sample container 200 to ensure that the temperature of the hydrate sample does not exceed 0 ℃ (or at least does not exceed 5 ℃), in this case, the dynamic test on the hydrate can greatly improve the accuracy of the test result.
As described above, the low temperature control device provided in the present specification has a simple structure, and may be assembled from two parts, i.e., the cylinder 1 and the pipeline 2, or may be integrally molded by using a corresponding mold or process, i.e., the structure of the low temperature control device integrally molded includes two parts, i.e., the cylinder 1 and the pipeline 2. When the low-temperature control device is used, only the incident rod 102 and the transmission rod 103 need to be respectively penetrated into the second cavity 20 of the pipeline 2, or the low-temperature control device can be directly sleeved on the incident rod 102 and the transmission rod 103. The sample container 200 may be pre-fixed to one end of the incident rod 102 or one end of the transmission rod 103, or other possible ways may be selected so that the sample container 200 is located in the second cavity 20 and the dynamic test can be performed, which is not limited in this specification. The low-temperature control device is simple to use and operate, and can be flexibly used by a person skilled in the art.
In addition, do not have the hopkinson pole device to the hydrate sample experiment of dynamics in the existing market, this specification provides the hopkinson pole device, realize the experimental requirement of the dynamics of hydrate sample through increasing low temperature control device, this low temperature control device comprises cylinder body 1 and pipeline 2, not only simple structure, practice thrift a large amount of costs, and it is nimble convenient to use, for example only need establish dotted line frame region in figure 1 with this low temperature control device is direct to overlap, then place the frozen water mixture can, after the use, can directly collect this low temperature control device, along with putting along with taking, along with putting, bring very big facility for the experimenter.
As a specific embodiment, the present specification provides a cryogenic control device, wherein the diameter of the first through hole 111 and the diameter of the second through hole 121 are both larger than the diameter of the incident rod 102 and the diameter of the transmission rod 103, and the incident rod 102 and the transmission rod 103 do not contact with the inner wall of the second cavity 20 during the experiment of the hopkinson rod. That is, the second chamber 20 provides the required temperature for the sample in the sample container 200 without interfering with the split Hopkinson bar testing process.
Further, the hopkinson bar device may further include a first insulation board and a second insulation board, which are not shown in the drawings of the specification. The first heat insulation plate is attached to the outer side of the first side wall 11 and covers the first through hole 111; the second insulation board is attached to the outer side of the second side wall 12 and covers the second through hole 121; the first heat preservation plate is provided with a first hollow, and the diameter of the first hollow is slightly larger than that of the incident rod 102, so that the incident rod 102 can sequentially penetrate through the first hollow and the first through hole 111; the second insulation board is provided with a second hollow, and the diameter of the second hollow is slightly larger than that of the transmission rod 103, so that the transmission rod 103 can sequentially pass through the second hollow and the second through hole 121. That is to say, because the aperture of the first through hole 111 and the second through hole 121 is large, the cold energy in the second cavity 20 can be lost to the outside, therefore, the two through holes are plugged by the two insulation boards, and simultaneously, the two insulation boards are respectively provided with the hollow holes with the diameters as large as the diameters of the incident rod 102 and the transmission rod 103, so that after the incident rod 102 and the transmission rod 103 respectively pass through the two through holes from the two hollow holes and then enter the second cavity 20, a closed space is equivalently formed in the second cavity 20, and the cold energy in the second cavity 20 can be effectively prevented from being lost.
Further, since the inner diameter of the first cavity and the inner diameter of the second cavity are respectively as much as the outer diameters of the incident rod 102 and the projecting rod 103, in order to reduce the influence on the test process, a lubricant may be applied to the inner side wall of the first cavity, and the incident rod 102 is in contact with the lubricant during the process that the incident rod 102 passes through the first cavity; lubricant is also applied to the inner side wall of the second hollow, and the transmission rod 103 is in contact with the lubricant during the process that the transmission rod 103 passes through the second hollow. Thus, due to the action of the lubricant, the friction between the incident rod 102 and the transmission rod 103 and the heat insulation plate can be greatly reduced, and the test error can be further reduced. Further, a layer of lubricant is also coated on the surfaces of the incident rod 102 and the transmission rod 103, so that when the incident rod 102 and the transmission rod 103 pass through the first hollow and the second hollow, the friction force between the incident rod 102 and the transmission rod 103 and the inner side walls of the first hollow and the second hollow respectively can be further reduced, and the test error can be further reduced. The lubricant can be vaseline or other lubricant. In addition, under the condition that the incident rod 102 and the transmission rod 103 respectively pass through the first hollow space and the second hollow space, the first heat-insulating plate and the second heat-insulating plate can enable the second cavity 20 to form a closed state, so that a better heat-insulating effect is achieved, and the cold energy in the second cavity 20 is prevented from losing.
Optionally, the first insulation board and the second insulation board are both foam boards, and the thickness of the foam boards is between 0.5 cm and 1.5 cm. As an example, a foam board with a thickness of 1cm may be generally selected as the insulation board, and those skilled in the art may also select an insulation board with a suitable thickness according to actual needs.
As a specific embodiment, the hopkinson bar apparatus provided herein may further include a temperature sensor and an alarm. Wherein the temperature sensor is mainly used for monitoring the ambient temperature in the second cavity 20; the alarm can receive the temperature data that this temperature sensor sent to when temperature data is higher than preset temperature, send out the alarm and remind. For example, an intelligent thermometer can be placed in the second cavity 20, and the cylinder body 1 and the pipeline 2 can be made of transparent materials, such as transparent plastics or transparent glass, so that a tester can directly see the temperature value of the intelligent thermometer in the second cavity 20 and then take corresponding operations according to the temperature value; in addition, the siren can be installed in the position that is not far away from this low temperature controlling means, and it can receive the signal that intelligent thermometer sent, judges whether to send out the police dispatch newspaper according to this signal to remind the interior temperature of testing personnel second cavity 20 to surpass the default.
Further, a storage bin may be provided in the second cavity 20, and the storage bin is used for placing dry ice to quickly reduce the ambient temperature in the second cavity 20. As an example, when the tester is reminded by an alarm or sees that the temperature value of the intelligent thermometer is higher than the preset temperature, dry ice can be manually placed into the storage bin, and the dry ice can rapidly absorb ambient heat, so as to rapidly reduce the temperature in the second cavity 20 to meet the preset temperature requirement. For example, an alarm may be issued when the temperature in the second chamber approaches or approaches 5 ℃, and a tester may place dry ice into the storage compartment to rapidly reduce the temperature of the second chamber.
In a specific embodiment, the hopkinson bar device provided by the present specification is mainly used for hydrate kinetic tests, and hydrates generally require a test environment lower than 5 ℃ and the temperature of an ice-water mixture is 0 ℃, so in this embodiment, the coolant contained in the first cavity 10 of the low-temperature control device may be an ice-water mixture. If the temperature in the second chamber 20 cannot be brought to about 0 ℃ in a short time, dry ice may be put into the storage bin, so that the temperature in the second chamber 20 may be rapidly reduced. The ice-water mixture has low cost and can be taken at any time, so that the cost of the device is further reduced, and the operation is more convenient. And the effect of rapid temperature reduction by the aid of dry ice can be used, so that the hydrate sample is in an environment below 5 degrees in the whole sample loading and testing process.
Further, the hopkinson bar apparatus of the present description may further include a plurality of ice packs for containing ice cubes. So, among the ice-water mixture that holds in the first cavity 10, the ice-cube can be placed in this ice bag, and the ice-cube in the ice bag melts the back, can change the ice bag at any time, and the water of melting in the ice bag can be put back in the freezer again, forms the ice-cube to can recycle, resources are saved. The ice bags can be selected according to actual needs, for example, small plastic bags can be selected to contain ice cubes, the number of the ice bags in the ice-water mixture can be also set according to actual conditions, and the operation is simple and convenient.
In summary, the hopkinson bar device provided by the present scheme is equivalent to providing a simple and convenient low temperature control device for a hopkinson bar, when in use, only the incident bar 102 and the transmission bar 103 need to penetrate into the second cavity 20 of the pipeline 2, and the cold energy generated by the ice water mixture in the first cavity 10 is utilized to provide an ambient temperature of 0 ℃ for the second cavity 20, so that the sample container 200 located in the second cavity 20 is located in an environment of 0 ℃, thereby ensuring that the sample in the sample container 200 can be tested at a proper temperature, and improving the accuracy of the test. In addition, can also prevent the cold volume in the second cavity 20 to run off through the mode that increases the heated board. The temperature in the second cavity 20 can be monitored in real time by adding a temperature sensor and an alarm to remind the tester, for example, the tester can put dry ice into the storage bin according to the temperature in the second cavity 20 to rapidly reduce the temperature in the second cavity 20. The low-temperature control device is simple in structure, saves a large amount of cost, is more flexible and convenient to use, can be taken and placed at will, and brings great convenience to testers.
It should be noted here that, since the hydrate is usually in a refrigerated state, for example, the hydrate is stored in a freezer, when the hydrate needs to be tested, the hydrate needs to be taken out of the freezer and then put into a sample container quickly, so as to reduce the temperature rise caused by the excessive heat absorption of the outside air by the hydrate during the hydrate taking process. As an alternative example, during the process of taking the hydrate sample, a specially designed sampling device can be used, for example, the hydrate can be taken out from the freezer by using the sampling device, the temperature in the sampling device can be kept consistent with the temperature in the freezer or at least lower than 5 ℃, then the hydrate sample is put into a sample container (if the sample container is fixed at one end of the transmission rod) by using the sampling device, and then the transmission rod is directly inserted into the second accommodating cavity 20, so as to ensure that the hydrate sample is not heated due to the overhigh external temperature to affect the test result during the transportation process. Regarding the process of taking out the hydrate sample from the freezer to placing in the sample container, and then sending the sample container into the second cavity 20, a person skilled in the art may also flexibly design a feasible solution according to actual needs, for example, regarding the specific structure of the sampling device, the design may be flexible as long as the sample can be taken and placed, and a temperature environment suitable for the sample is provided for the sample in the process of taking and placing the sample, which is not limited in the present specification.
While certain embodiments of the present disclosure have been described above, other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily have to be in the particular order shown or in sequential order to achieve desirable results. The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present specification, and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. The Hopkinson bar device for the hydrate dynamics test is characterized by at least comprising a low-temperature control device, a pressure bar system and a sample container, wherein the pressure bar system sequentially comprises an impact bar, an incident bar and a transmission bar from left to right, and the sample container is positioned between the incident bar and the transmission bar; wherein the sample container is fixed to one end of the transmission rod in advance;
the Hopkinson bar device further comprises a sampling device, wherein the sampling device can be used for transferring a hydrate sample to the sample container, and the sampling device can enable the hydrate sample to be lower than 5 ℃ in the transferring process;
the low temperature control device includes: a cylinder body with an opening at the upper end and a pipeline with openings at two ends; wherein, the cylinder body of upper end open-ended specifically is: a structure which is enclosed by the bottom surface and the four side walls and is provided with an opening at the upper end;
a first through hole is formed in a first side wall of the cylinder body, and a second through hole is formed in a second side wall, opposite to the first side wall, of the cylinder body;
the first end of the pipeline is fixed on the first side wall and covers the first through hole, and the second end of the pipeline is fixed on the second side wall and covers the second through hole;
the cylinder body and the pipeline are of an integrally formed structure;
the cylinder body is provided with a first cavity, the first cavity is formed by enclosing the bottom surface and the four side walls, and the first cavity is used for containing a cooling object; the pipeline is provided with a second cavity, the second cavity is used for accommodating the sample container, the incident rod can penetrate into the second cavity from the first through hole, the transmission rod can penetrate into the second cavity from the second through hole, and the impact force of the incident rod acts on the sample container; and the number of the first and second groups,
the cooling object contained in the first cavity can transfer cold energy into the second cavity, so that the ambient temperature in the second cavity reaches a preset temperature of 0 ℃, and a preset temperature environment is further provided for the sample in the sample container;
the hopkinson bar device further includes:
a temperature sensor for monitoring an ambient temperature within the second cavity;
the alarm can receive the temperature data sent by the temperature sensor and send out alarm prompt when the temperature data is higher than a preset temperature;
be provided with the storage compartment in the second cavity, the storage compartment is used for placing the dry ice to reduce fast ambient temperature in the second cavity.
2. The hopkinson bar device of claim 1, wherein the diameter of the first through hole and the diameter of the second through hole are both larger than the diameter of the incident bar and the diameter of the transmission bar, and the incident bar and the transmission bar do not contact with the inner wall of the second cavity during the test of the hopkinson bar.
3. The hopkinson bar arrangement of claim 2, further comprising: the first heat-insulation plate and the second heat-insulation plate;
the first heat-preservation plate is attached to the outer side of the first side wall and covers the first through hole; the second insulation board is attached to the outer side of the second side wall and covers the second through hole;
the first heat preservation plate is provided with a first hollow, and the diameter of the first hollow is slightly larger than that of the incident rod, so that the incident rod can sequentially penetrate through the first hollow and the first through hole; the second insulation board is provided with a second hollow, and the diameter of the second hollow is slightly larger than that of the transmission rod, so that the transmission rod can sequentially penetrate through the second hollow and the second through hole.
4. The hopkinson bar assembly of claim 3, wherein the inner side wall of the first hollow is coated with a lubricant, the incident bar being in contact with the lubricant during the passage of the incident bar through the first hollow;
the inner side wall of the second hollow cavity is coated with a lubricant, and the transmission rod is in contact with the lubricant in the process of passing through the second hollow cavity;
under the condition that the incident rod and the transmission rod respectively penetrate through the first hollow hole and the second hollow hole, the first heat-preservation plate and the second heat-preservation plate can enable the second cavity to form a closed state.
5. The Hopkinson bar arrangement of claim 4, wherein a surface of the incident bar and a surface of the transmission bar are both coated with a lubricant;
and/or the first heat-insulation plate and the second heat-insulation plate are both foam plates, and the thickness of each foam plate is 0.5-1.5 cm.
6. Hopkinson bar arrangement according to any one of claims 1 to 5, wherein the cooling substance is an ice water mixture.
7. The Hopkinson bar assembly of claim 6, further comprising a plurality of ice bags for containing ice pieces such that ice pieces can be placed within the ice bags in the ice-water mixture contained within the first cavity.
8. The Hopkinson bar apparatus according to any one of claims 1 to 5, wherein the cylinder body is made of a transparent material;
and/or the pipeline is made of transparent materials.
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| CN202110855697.0A CN113295517B (en) | 2021-07-28 | 2021-07-28 | Hopkinson bar device for hydrate kinetic test |
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| CN202110855697.0A CN113295517B (en) | 2021-07-28 | 2021-07-28 | Hopkinson bar device for hydrate kinetic test |
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| CN104655502B (en) * | 2015-03-09 | 2018-02-09 | 中国矿业大学(北京) | A kind of low temperature test device for Hopkinson bar |
| CN107687981B (en) * | 2017-09-21 | 2023-12-15 | 南京理工大学 | Liquid nitrogen cooling device suitable for low temperature dynamic mechanical experiment |
| CN108613863A (en) * | 2018-05-25 | 2018-10-02 | 哈尔滨工程大学 | A kind of quick cooling device for low temperature SHPB impact experiments |
| CN109406311A (en) * | 2018-12-26 | 2019-03-01 | 深圳大学 | The temperature control system and method for true triaxial coupled static-dynamic loadingi Hopkinson pressure bar |
| CN110763576A (en) * | 2019-10-22 | 2020-02-07 | 哈尔滨工程大学 | Low-temperature environment box for ice material Hopkinson bar experiment |
| CN112816350A (en) * | 2021-02-08 | 2021-05-18 | 天津大学 | Dual-purpose freeze thawing test box capable of being combined with Hopkinson bar |
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