Cryogenic tensile tester
The cryogenic tensile testing machine addresses insufficient cooling in conventional devices by using a cryogenic refrigerator and flexible copper braid wire for precise temperature control, enabling accurate tensile testing at cryogenic levels.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CRYO H&I INC
- Filing Date
- 2025-12-17
- Publication Date
- 2026-06-25
AI Technical Summary
Conventional low-temperature testing devices inadequately cool specimens due to insufficient heat exchange, limiting the achievable temperature and accuracy of low-temperature tensile tests.
A cryogenic tensile testing machine that uses a cryogenic refrigerator to directly cool specimens, combined with a tensile testing machine, insulating members, and a flexible copper braid wire to transfer heat, allowing precise control of specimen temperature and accurate tensile testing at cryogenic levels.
Enables direct cooling of specimens to desired cryogenic temperatures, ensuring efficient heat transfer and accurate measurement of tensile strength and yield point, minimizing errors and damage during testing.
Smart Images
Figure KR2025021982_25062026_PF_FP_ABST
Abstract
Description
Cryogenic tensile testing machine
[0001] The present invention relates to a cryogenic tensile testing machine.
[0002] Unless otherwise indicated in this specification, the contents described in this identification item are not prior art for the claims of this application, and are not recognized as prior art simply because they are described in this identification item.
[0003] Metallic materials possess various physical properties such as toughness, ductility, brittleness, and stiffness, and low-temperature tests are also being conducted to measure these properties at low temperatures.
[0004] Here, since most brittle deformation occurs at low temperatures, the test is conducted at low temperatures to reflect the actual phenomenon.
[0005] In the case of conventional low-temperature testing devices, the specimen was cooled using a simple cooling method in which vaporized liquid nitrogen was sprayed around the specimen to lower its temperature, and then the necessary test was performed once the target temperature was reached.
[0006] However, conventional low-temperature testing devices simply spray vaporized liquid nitrogen only around the specimen, so the temperature at which the specimen can be cooled is limited, and there was a problem in that heat exchange with the specimen was insufficient because the vaporized liquid nitrogen was sprayed only around the specimen.
[0007] The present invention aims to solve the above-mentioned problems by providing a cryogenic tensile testing machine that cools a specimen using a cryogenic refrigerator and performs a tensile test on the specimen using a tensile machine.
[0008] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description below.
[0009] A cryogenic tensile testing machine according to one embodiment of the present invention may include: a first chamber having a viewport formed on one side; a fixing part disposed inside the first chamber and fixing the specimen; a cryogenic refrigerator in which a displacer is connected through the first chamber and cools the specimen through a cold head; a cold plate in contact with the cold head and receiving heat from the cryogenic refrigerator; a wire part having flexibility and made of a metal wire, one end of which is connected to the cold plate and the other end of which is connected to the fixing part to transfer heat from the cryogenic refrigerator to the specimen; and a tensile testing machine that performs a tensile test of the specimen using the fixing part.
[0010] In one embodiment, the fixing part may include a fixing unit disposed in the lower part of the first chamber and connected to one end of the specimen to fix it; and a transfer unit disposed in the upper part of the first chamber and connected to the other end of the specimen and moved up and down by the tensioner.
[0011] In one embodiment, at least a portion of the fixed unit and the transfer unit may be formed of an insulating member.
[0012] In one embodiment, the fixed unit and the transfer unit are composed of circular plates, and the insulating member is formed to be larger than the diameter of the fixed unit and the transfer unit so as to be connected to a housing that surrounds the fixed unit and the transfer unit.
[0013] In one embodiment, the wire portion may be a copper braid wire made of copper wire.
[0014] In one embodiment, the wire portion may further include a temperature sensor for measuring the temperature of the specimen.
[0015] In one embodiment, a heater unit connected to the cold plate and heating the specimen may be further included.
[0016] In one embodiment, the material of the viewport may be composed of quartz.
[0017] In one embodiment, a roughing pump connected to the first chamber and forming a low vacuum inside the first chamber may be further included.
[0018] In one embodiment, the device may further include a control unit that controls the operation of the cryogenic refrigerator, the fixing part, and the tensioner.
[0019] In one embodiment, the control unit may operate a roughing pump when the specimen is fixed to the fixing part, and operate the cryogenic refrigerator when the pressure in the first chamber is less than a preset first pressure value.
[0020] In one embodiment, the control unit can measure the yield point and tensile strength of the specimen by moving the transfer unit of the fixing unit upward when the temperature of the specimen cooled through the cryogenic refrigerator reaches a preset first temperature value.
[0021] In one embodiment, the control unit may stop the operation of the transfer unit and operate the heater unit when the specimen is destroyed by the transfer unit.
[0022] A cryogenic tensile testing machine according to one embodiment of the present invention can cool a specimen directly through a cryogenic refrigerator to a cryogenic temperature desired by the user.
[0023] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description below.
[0024] FIG. 1 is a drawing showing an ultra-low temperature tensile testing machine according to one embodiment of the present invention.
[0025] FIG. 2 is a block diagram showing an ultra-low temperature tensile testing machine according to one embodiment of the present invention.
[0026] FIG. 3 is a drawing showing a first chamber in a cryogenic tensile testing machine according to one embodiment of the present invention.
[0027] FIG. 4 is a drawing showing the interior of the first chamber in a cryogenic tensile testing machine according to one embodiment of the present invention.
[0028] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification are denoted by similar reference numerals.
[0029] Throughout the specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, throughout the specification, when a part is described as "connected" to another part, this includes not only cases where they are directly connected, but also cases where they are connected with an intermediate component interposed, and cases where they are electrically connected with an intermediate element. Moreover, throughout the specification, when a component is described as being "on" another component, this includes not only cases where a component is in contact with another component, but also cases where another component exists between the two components. Additionally, expressions such as "first," "second," etc., used in this specification may modify various components regardless of order and / or importance; they are used merely to distinguish one component from another and do not limit those components, nor do they necessarily refer to different components. For example, "first direction" and "second direction" may refer to the same direction or different directions.
[0030] FIG. 1 is a drawing showing an ultra-low temperature tensile testing machine (10) according to one embodiment of the present invention, FIG. 2 is a block diagram showing an ultra-low temperature tensile testing machine (10) according to one embodiment of the present invention, FIG. 3 is a drawing showing a first chamber (100) in an ultra-low temperature tensile testing machine (10) according to one embodiment of the present invention, and FIG. 4 is a drawing showing the interior of the first chamber (100) in an ultra-low temperature tensile testing machine (10) according to one embodiment of the present invention.
[0031] Referring to FIGS. 1 to 4, the ultra-low temperature tensile testing machine (10) may include a first chamber (100), a fixing part (200), a cryogenic refrigerator (300), a cold plate (400), a wire part (500), and a tensioner (600).
[0032] A cryogenic tensile testing machine (10) according to one embodiment of the present invention conducts a test after cooling a specimen (11) placed inside, and can measure the tensile strength of the specimen (11) at a low temperature.
[0033] In one embodiment, a viewport (110) may be formed on one side of the first chamber (100).
[0034] For example, as shown in FIGS. 1 to 4, the first chamber (100) is a space for testing a specimen (11), and can be formed as a sealed structure in which the specimen (11) is stored inside, and can perform a tensile test of the specimen (11) by connecting a tensioner (600) to the top of the first chamber (100).
[0035] A first door portion may be formed on one side of the first chamber (100) to facilitate the replacement of a specimen (11) stored inside the first chamber (100), and a viewport (110) may be formed on the first door portion to check the specimen (11) stored inside the first chamber (100) or to measure the tensile strength of the specimen (11).
[0036] In one embodiment, the material of the viewport (110) may be composed of quartz.
[0037] Here, since the material of the viewport (110) is composed of quartz, when measuring the tensile test from the outside through the viewport (110) the inside of the first chamber (100), the measurement value may differ depending on the refractive index, so the accuracy of the measurement value can be improved by using quartz with a low refractive index.
[0038] In one embodiment, the ultra-low temperature tensile testing machine (10) may further include a roughing pump connected to a first chamber (100) and forming a low vacuum inside the first chamber (100).
[0039] For example, when a specimen (11) is placed in the first chamber (100), the first chamber (100) can be closed and a roughing pump connected to the first chamber (100) can be operated to form a low vacuum within the first chamber (100).
[0040] In one embodiment, the fixing part (200) is placed inside the first chamber (100) and can fix the specimen (11).
[0041] For example, as shown in FIGS. 3 and 4, the fixing part (200) can fix both ends of the specimen (11) so that a test can be performed, and a tensile test can be performed using a tensioner (600) connected to the fixing part (200).
[0042] In one embodiment, the fixing part (200) may include a fixing unit (210) and a transfer unit (220).
[0043] The fixed unit (210) is positioned in the lower part of the first chamber (100) and can be fixed by connecting it to one end of the specimen (11).
[0044] For example, the fixed unit (210) is connected to one end of the specimen (11) as shown in FIGS. 3 and 4, and can serve to fix the specimen (11) when performing a tensile test through the tensioner (600).
[0045] The transfer unit (220) is positioned at the top of the first chamber (100) and connected to the other end of the specimen (11), and can be moved up and down by the tensioner (600).
[0046] For example, as shown in FIGS. 3 and 4, the transfer unit (220) is positioned at the top of the first chamber (100) and connected to the tensioner (600) and connected to the other end of the specimen (11), and can be moved upward together with the specimen (11) when a tensile test is performed through the tensioner (600).
[0047] In one embodiment, at least a portion of the fixed unit (210) and the transfer unit (220) may be formed of an insulating member (230).
[0048] For example, as shown in FIGS. 3 and 4, the insulating member (230) may be connected to the upper and lower parts of the fixed unit (210) and formed to correspond to the shape of the fixed unit (210). Additionally, the insulating member (230) may be connected to the lower part of the transfer unit (220) and formed to correspond to the shape of the transfer unit (220).
[0049] In one embodiment, the fixed unit (210) and the transfer unit (220) are composed of circular plates, and the insulating member (230) is formed to be larger than the diameter of the fixed unit (210) and the transfer unit (220) and can be connected to a housing (201) that surrounds the fixed unit (210) and the transfer unit (220).
[0050] For example, the fixed unit (210) and the transfer unit (220) are composed of circular plates, and correspondingly, the shape of the insulating member (230) can also be composed of a circular plate. In addition, the diameter of the insulating member (230) is formed to be larger than the diameter of the fixed unit (210) and the transfer unit (220), so that it can be connected to the housing (201) that surrounds the fixed unit (210) and the transfer unit (220).
[0051] In this way, since the insulating member (230) is formed to be larger than the diameter of the fixed unit (210) and the transfer unit (220) and is connected to the housing (201) surrounding the fixed unit (210) and the transfer unit (220), when the specimen (11) is cooled by the cryogenic refrigerator (300), heat transfer of the specimen (11) to the fixed unit (210), the transfer unit (220), and the housing (201) surrounding them can be prevented. Accordingly, it is also possible to prevent the transfer unit (220) and the housing (201) from being joined together due to heat transfer, thereby preventing damage and errors in the tensile test.
[0052] In one embodiment, the fixing part (200) may further include a temperature sensor (510) for measuring the temperature of the specimen (11).
[0053] For example, the fixed part (200) further includes a temperature sensor (510), so that when the temperature of the specimen (11) reaches a preset first temperature value through the control part (700) described later, the transfer unit (220) of the fixed part (200) can be moved upward to measure the yield point and tensile strength of the specimen (11).
[0054] In one embodiment, the cryogenic refrigerator (300) may have a displacer (310) connected through the first chamber (100) and may cool a specimen (11) through a cold head (320). In the present invention, the cryogenic refrigerator (300) may be a cryogenic refrigerator (300) that generates cooling capacity by a GM (Gifford-McMahon) cycle using helium gas as the working fluid.
[0055] For example, as shown in FIGS. 3 and 4, the cryogenic refrigerator (300) is connected such that a displacer (310) penetrates the first chamber (100), and a cold head (320) connected to the end of the displacer (310) is connected to a cold plate (400) to transfer heat to a specimen (11).
[0056] Additionally, referring to FIG. 3, the cryogenic refrigerator (300) may be configured in multiple units to efficiently cool the specimen (11), and the cryogenic refrigerator (300) configured in multiple units is connected to the end, middle, and tartan portions of the cold plate (400), respectively, thereby enabling heat to be transferred uniformly toward the specimen (11).
[0057] In one embodiment, the cold plate (400) can be in contact with the cold head (320) to receive heat from the cryogenic refrigerator (300).
[0058] For example, as shown in FIGS. 3 and 4, one side of the cold plate (400) is connected to the cold head (320) of the cryogenic refrigerator (300), and the other side is connected to the wire section (500) to transfer heat to the specimen (11).
[0059] In one embodiment, the ultra-low temperature tensile testing machine (10) may further include a heater unit (410) connected to a cold plate (400) and heating a specimen (11).
[0060] For example, as shown in FIG. 4, the heater unit (410) is connected to the cold plate (400), and after the tensile test is finished, the heater unit (410) can be operated through the control unit (700) described later to heat the cold plate (400), the wire unit (500), and the specimen (11).
[0061] In one embodiment, the wire portion (500) may be flexible and made of a metal wire, and one end of the wire portion (500) is connected to a cold plate (400) and the other end is connected to a fixed portion (200), and heat from a cryogenic refrigerator (300) can be transferred to a specimen (11).
[0062] For example, as shown in FIGS. 3 and 4, the wire section (500) is composed of a plurality of metal wires, one end is connected to the cold plate (400), and the other end is connected to the fixing unit (210) and the transfer unit (220) of the fixing section (200), respectively, so that the heat of the cryogenic refrigerator (300) can be transferred to both ends of the specimen (11). In addition, a plurality of wire sections (500) can be connected to the fixing unit (210) and a plurality of wire sections (500) can also be connected to the transfer unit (220), and accordingly, the heat of the cryogenic refrigerator (300) can be efficiently transferred to the specimen (11).
[0063] In one embodiment, the wire portion (500) may be a copper braid wire made of copper wire.
[0064] Here, the braided wire is a wire made by twisting multiple strands of tin-plated copper wire, and since it has excellent flexibility, the multiple wire sections (500) connected to the transfer unit (220) may not be damaged when moved up and down by the tensioner (600).
[0065] In one embodiment, the tensioner (600) can perform a tensile test of the specimen (11) using the fixing part (200).
[0066] For example, as shown in FIGS. 1 to 3, the tensioner (600) is connected through the upper part of the first chamber (100), connected to the transfer unit (220) of the fixing part (200), and can perform a tension test by moving up and down through the control part (700).
[0067] A cryogenic tensile testing machine (10) according to one embodiment of the present invention may further include a control unit (700).
[0068] The control unit (700) can control the operation of the cryogenic refrigerator (300), the fixing unit (200), and the tensioner (600).
[0069] In one embodiment, the control unit (700) can operate a roughing pump when the specimen (11) is fixed to the fixing unit (200), and can operate a cryogenic refrigerator (300) when the pressure inside the first chamber (100) is less than a preset first pressure value.
[0070] For example, when a specimen (11) is placed inside the first chamber (100) and the specimen (11) is fixed to the fixing part (200), the control unit (700) can close the first chamber (100) and operate a roughing pump to form a low vacuum inside the first chamber (100), and when the pressure inside the first chamber (100) becomes less than a preset first pressure value, the operation of the roughing pump can be stopped and the cryogenic refrigerator (300) can be operated.
[0071] In one embodiment, the control unit (700) can measure the yield point and tensile strength of the specimen (11) by moving the transfer unit (220) of the fixing unit (200) upward when the temperature of the specimen (11) cooled through the cryogenic refrigerator (300) reaches a preset first temperature value.
[0072] For example, when the temperature of the specimen (11) cooled through the cryogenic refrigerator (300) reaches a preset first temperature value, the control unit (700) can move the transfer unit (220) upward through the tensioner (600) and measure the yield point and tensile strength of the specimen (11).
[0073] In addition, to maintain the temperature of the specimen (11) at a preset first temperature value, the operation of the cryogenic refrigerator (300) may be stopped or the heater (410) may be operated.
[0074] At this time, the yield point and tensile strength of the specimen (11) can be measured through the viewport (110) as described above, or through a measuring sensor (not shown) attached to the specimen (11).
[0075] In one embodiment, the control unit (700) can stop the operation of the transfer unit (220) and operate the heater unit (410) when the specimen (11) is destroyed by the transfer unit (220).
[0076] For example, when the specimen (11) is destroyed as the control unit (700) moves the transfer unit (220) connected to the specimen (11) upward through the tensioner (600), the operation of the transfer unit (220) can be stopped and the heater unit (410) can be operated to raise the temperature of the cold plate (400) and the specimen (11).
[0077] As described above, the ultra-low temperature tensile testing machine (10) according to one embodiment of the present invention can directly cool the specimen (11) through the cryogenic refrigerator (300) to a cryogenic temperature desired by the user.
[0078] Additionally, at least a portion of the fixed unit (210) and the transfer unit (220) is formed as an insulating member (230), and the insulating member (230) is formed to be larger than the diameter of the fixed unit (210) and the transfer unit (220) and is connected to the housing (201) surrounding the fixed unit (210) and the transfer unit (220), so that when the specimen (11) is cooled by the cryogenic refrigerator (300), the temperature of the specimen (11) can be prevented from being transferred to the fixed unit (210), the transfer unit (220), and the housing (201) surrounding them.
[0079] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that the present invention can be easily modified into other specific forms without changing the technical concept or essential features of the invention.
[0080] Therefore, the embodiments described above should be understood as exemplary in all respects and not limiting.
[0081] For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.
[0082] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single unit may be implemented in a distributed manner, and components described as distributed may likewise be implemented in a combined form.
[0083] The scope of the present invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the present invention.
Claims
1. In a cryogenic tensile testing machine that performs a tensile test of a specimen in a cryogenic environment, A first chamber in which a viewport is formed on one side; A fixing part disposed inside the first chamber and fixing the specimen; A cryogenic refrigerator in which a displacer is connected through the first chamber and cools the specimen through a cold head; A cold plate in contact with the above cold head and receiving heat from the above cryogenic refrigerator; A wire portion having flexibility and made of a metal wire, wherein one end is connected to the cold plate and the other end is connected to the fixed portion to transfer heat from the cryogenic refrigerator to the specimen; and A tensile machine that performs a tensile test of the specimen using the above-mentioned fixing part A cryogenic tensile testing machine that includes 2. In Paragraph 1, The above fixed part is, A fixing unit disposed in the lower part of the first chamber and connected to and fixed to one end of the specimen; and A cryogenic tensile testing machine comprising a transfer unit positioned at the top of the first chamber, connected to the other end of the specimen, and moved up and down by the tensioner.
3. In Paragraph 2, A cryogenic tensile testing machine in which at least a portion of the fixed unit and the transfer unit is formed of an insulating member.
4. In Paragraph 3, The above fixed unit and the above transfer unit are composed of circular plates, and A cryogenic tensile testing machine in which the above-mentioned insulating member is formed to be larger than the diameter of the above-mentioned fixed unit and the above-mentioned transfer unit and is connected to a housing that surrounds the above-mentioned fixed unit and the above-mentioned transfer unit.
5. In Paragraph 1, A cryogenic tensile testing machine in which the above-mentioned fixed part further includes a temperature sensor for measuring the temperature of the specimen.
6. In Paragraph 1, A cryogenic tensile testing machine in which the above-mentioned wire portion is a copper braid wire.
7. In Paragraph 1, A cryogenic tensile testing machine further comprising a heater unit connected to the above cold plate and heating the specimen.
8. In Paragraph 1, A cryogenic tensile testing machine in which the material of the above-mentioned viewport is composed of quartz.
9. In Paragraph 1, A cryogenic tensile testing machine further comprising a roughing pump connected to the first chamber and forming a low vacuum inside the first chamber.
10. In Paragraph 1, A cryogenic tensile testing machine further comprising a control unit that controls the operation of the above cryogenic refrigerator, the above fixed part, and the above tensioner.
11. In Paragraph 10, The above control unit is, A cryogenic tensile testing machine that operates a roughing pump when the specimen is fixed to the fixed part and operates a cryogenic refrigerator when the pressure inside the first chamber is less than a preset first pressure value.
12. In Paragraph 10, The above control unit is, A cryogenic tensile testing machine that measures the yield point and tensile strength of a specimen by moving the transfer unit of the fixed part upward when the temperature of the specimen cooled through the cryogenic refrigerator reaches a preset first temperature value.
13. In Paragraph 12, The above control unit is, A cryogenic tensile testing machine that stops the operation of the transfer unit and operates the heater unit when the above specimen is destroyed by the above transfer unit.