CN215894210U - Test jig for tensile property of superconducting cable - Google Patents
Test jig for tensile property of superconducting cable Download PDFInfo
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- CN215894210U CN215894210U CN202121414947.9U CN202121414947U CN215894210U CN 215894210 U CN215894210 U CN 215894210U CN 202121414947 U CN202121414947 U CN 202121414947U CN 215894210 U CN215894210 U CN 215894210U
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Abstract
The utility model provides a superconductive cable tensile properties's test jig, includes sample rack (1), pulling force unit, measuring unit, test sample area (2), its characterized in that: one end of the sample placing rack (1) is provided with a suspension platform for suspending the tension unit; one end of the tension unit is fixed on the suspension platform, and the other end of the tension unit is fixedly connected with one end of the test sample belt and is used for applying load to the test sample belt (2) and measuring the load applied in the test process; the test sample belt (2) is placed on the sample placing frame (1), one end of the test sample belt obtains test tension through the tension unit, and the other end of the test sample belt is fixed at the other end of the sample placing frame (1); the measuring unit is bound with one or more points in the test sample belt (2) and is used for measuring the offset of the positions when the tension unit applies load and deforms.
Description
Technical Field
The utility model relates to the field of superconducting power transmission, in particular to a test jig for tensile property of a superconducting cable.
Background
At present, superconducting technology is increasingly used in power systems. Compared to power cables, superconducting cables have great advantages, such as: the power transmission capacity is strong, the cost is saved, the occupied space is small, the line impedance is extremely low, the power transmission loss is small, and the anti-magnetic interference capacity is strong; the method allows long-distance power transmission with relatively low voltage, and can also transmit power underground, thereby avoiding noise, electromagnetic pollution and potential safety hazard caused by ultrahigh-voltage high-altitude power transmission and protecting the ecological environment.
In the prior art, in order to consider the difference of the laying requirements of the superconducting cable under different conditions, parameter allowance can be designed for the laying engineering of the superconducting cable, and meanwhile, standards and references can be provided for the laying engineering, so that the superconducting cable needs to be laidThe tensile properties of the cable and its core are known and relevant parameters of its mechanical tensile properties are obtained by testing. Background art 1: NbTi, Nb3The tensile property research of the Sn superconducting wire, wear super-equal, low-temperature physics, volume 36, No. 6, and 12 months 2014. Tensile tests and tensile curves before and after heat treatment of superconducting wires are disclosed in the background. However, the test method in the prior art has a complex structure, low measurement precision and high cost.
Therefore, a new test jig for tensile properties of superconducting cables is needed.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model aims to provide the test frame for the tensile property of the superconducting cable, two suspension lines are placed on a horizontal test bed, and the displacement of the suspension lines is measured based on the change of stress, so that the shrinkage rate and the Young modulus of a test sample tape are obtained, the test result is accurate, and the test method is simple and convenient.
The utility model adopts the following technical scheme.
A test jig for tensile property of a superconducting cable comprises a sample placing rack 1, a tension unit, a measuring unit and a test sample belt 2, wherein one end of the sample placing rack 1 is provided with a suspension platform for suspending the tension unit; one end of the tension unit is fixed on the suspension platform, and the other end of the tension unit is fixedly connected with one end of the test sample belt and is used for applying a load to the test sample belt 2 and measuring the load applied in the test process; the test sample belt 2 is placed on the sample placing rack 1, one end of the test sample belt obtains test tension through the tension unit, and the other end of the test sample belt is fixed at the other end of the sample placing rack 1; the measuring unit is bound with one or more points in the test sample belt 2 and is used for measuring the offset of the position when the tension unit applies load and deforms.
Preferably, the tension unit comprises a tension meter 3, a hand hoist 4, a pulley and a stainless steel cable; moreover, the tension meter is suspended on the suspension platform, and is connected with the manual hoist 4; one end of a stainless steel cable penetrates through the hand hoist 4 to serve as a tension providing part, and the other end of the stainless steel cable is fixedly connected with one end of the test sample belt 2 through a pulley.
Preferably, the measuring unit includes a first measuring unit and a second measuring unit; the first measuring unit and the second measuring unit respectively include a plumb line 5, a pointer top 7 and a ruler 8.
Preferably, the suspension line 5 is suspended on the ceiling and vertically fixed on the corresponding position of the test sample belt through a pointer of the pointer gyroscope 7; the pointer gyroscope 7 shifts based on the offset of the corresponding position of the test sample band; the ruler 8 measures the offset of the pointer gyroscope and converts the offset of the corresponding position of the test sample belt.
Preferably, the pointer gyroscope and the ruler are placed on the first and second measuring platforms, the center of the pointer gyroscope is rotatably fixed on the platform, the pointer gyroscope is provided with three pointers which are respectively spaced by 120 degrees, and one pointer is fixedly connected with the suspension line.
Preferably, the distance between the suspension line and the center of the pointer top compared with the distance between the ruler and the center of the pointer top is a transformation ratio delta L, and when the transformation ratio delta L is larger than 1, the amplification of the displacement delta L of the suspension line is realized and the reading is carried out.
Preferably, the first measuring unit and the second measuring unit are fixed on the test sample belt at positions which are respectively equal in distance from the first end and the second end of the test sample belt.
Preferably, the measuring ranges of the tension meter and the hand-operated hoist are both 5T; and, the tensiometer is the electronic tensiometer.
Preferably, the test rack further comprises a liquid nitrogen tank 6 arranged outside the sample placing rack, and when the inside of the sample placing rack is filled with liquid nitrogen, the test sample belt is ensured to be placed in a liquid nitrogen environment of 77K.
Preferably, the sample rack holds 10 meters of test strips; and the test sample belt is a copper lining core or a long and short sample superconducting cable.
Compared with the prior art, the test frame for the tensile property of the superconducting cable has the advantages that the test sample belt can be horizontally placed on the test frame, the copper lining core and the superconducting cable can be respectively tested, the tensile property under different conditions such as normal temperature and liquid nitrogen environment can be obtained, the method is simple, the instrument is easy and convenient to use, the cost is low, and the test is accurate.
The beneficial effects of the utility model also include:
1. the stretching device is horizontally arranged on the ground, so that the influence of gravity factors on process data and measurement result data in the measurement process is overcome, and the accuracy of the test is ensured.
2. The fingertip gyroscope with a certain measurement magnification is adopted in the utility model, so that the measurement result is more accurate and reliable, and the measurement error is greatly reduced. In addition, the measuring instrument is very simple, but the design mode is ingenious, and the accurate measurement and evaluation of the cable length change can be realized at extremely low cost and low cost.
3. The utility model fully predicts the system error of the test stand, overcomes the influence of the system error on the test result by stretching the cable and the like before the test starts, and improves the test accuracy.
Drawings
Fig. 1 is a schematic view of a tensile test jig used in a test jig for tensile properties of a superconducting cable according to the present invention;
fig. 2 is a schematic view of a measuring unit of a tensile test jig used in a test jig for tensile properties of a superconducting cable according to the present invention.
Reference numerals:
1-placing a sample rack;
2-testing the sample tape;
3-a tension meter;
4-hand hoist;
5-the plumb line;
6-liquid nitrogen tank;
7-pointer top;
8-ruler;
9-thin wire.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present application is not limited thereby.
Fig. 1 is a schematic view of a tensile test jig used in a test jig for tensile properties of a superconducting cable according to the present invention. As shown in FIG. 1, a test jig for tensile properties of a superconducting cable comprises a sample placing frame 1, a tension unit, a measuring unit and a test sample tape 2. One end of the sample placing frame 1 is provided with a suspension platform for suspending a tension unit; one end of the tension unit is fixed on the suspension platform, and the other end of the tension unit is fixedly connected with one end of the test sample belt 2 and is used for applying a load to the test sample belt 2 and measuring the load applied in the test process; the test sample belt 2 is placed on the sample placing rack 1, one end of the test sample belt obtains test tension through the tension unit, and the other end of the test sample belt is fixed at the other end of the sample placing rack 1; the measuring unit is bound with one or more points in the test sample belt 2 and is used for measuring the offset of the one or more points when the tension unit applies load and deforms.
Preferably, the tension unit comprises a tension meter 3, a hand hoist 4, a pulley and a stainless steel cable; and, the tensiometer 3 hangs on hanging the platform, connects hand block 4 down. One end of a stainless steel cable penetrates through the hand hoist 4 to serve as a tension providing part, and the other end of the stainless steel cable is fixedly connected with one end of the test sample belt 2 through a pulley.
It will be appreciated that a gradually increasing or decreasing load may be applied to one end of the test strip 2 by the chain block 4 when the test strip 2 is placed in the test rack and held in a fixed position by the test unit. The tension of the test strip 2 will vary depending on the load level. At this time, the measurement unit measures the offset at the fixed position, so that the tensile condition of the whole test sample tape 2 can be obtained. Meanwhile, the load applied to one end of the test strip by the manual hoist 4 can be accurately measured by the tension meter 3. Therefore, in the case of gradually increasing or decreasing the load, the test can obtain a stress-strain curve of the test strip 2, and accurately calculate the young's modulus of the test strip 2 from the curve.
Similarly, the test rack can be placed in different test environments, such as a room temperature environment or a liquid nitrogen environment. And the shrinkage of the test strip 2 under different circumstances was measured with the same load applied.
Preferably, the measuring unit includes a first measuring unit and a second measuring unit; the first measuring unit and the second measuring unit respectively include a plumb line 5, a pointer top 7 and a ruler 8.
Preferably, the suspension line 5 is suspended on the ceiling and vertically fixed on the corresponding position of the test sample belt 2 through a pointer of the pointer gyroscope 7; the pointer gyroscope 7 shifts based on the offset of the corresponding position of the test sample belt 2; the ruler 8 measures the offset of the pointer gyroscope 7 and converts the offset of the corresponding position of the test sample belt 2.
Fig. 2 is a schematic view of a measuring unit of a tensile test jig used in a test jig for tensile properties of a superconducting cable according to the present invention. As shown in fig. 2, preferably, a pointer top and a ruler are placed on the first and second measuring platforms, the center of the pointer top is rotatably fixed to the platform, the pointer top has three pointers spaced 120 degrees apart, respectively, and one pointer is fixedly connected to the plumb line.
Specifically, the connection mode of the measuring unit in the tensile test stand is that the center of the pointer gyroscope is fixed on a platform for placing the gyroscope, and the pointer gyroscope can rotate freely by taking the fixed center position as an axis. The pointer gyroscope comprises three pointers which form an angle of 120 degrees with each other, namely thin welding wires, wherein one pointer is fixedly connected with a suspension line in the suspension direction. The utility model can be connected and fixed by glue or welding and other modes. In addition, the far ends of the other one or two pointers can measure the displacement of the suspension line according to the rotation angle of the pointer gyroscope.
It can be understood that in order to accurately measure the displacement of the suspension line, the length of the suspension line, which is multiplied by the length of the fixed point of the pointer from the center of the pointer gyroscope, can be set to be smaller than the length of the boundary point of the ruler and the other pointer from the center of the pointer gyroscope. In this way, the length of the plumb line can be scaled up proportionally, and even if an error occurs during the test, the error will be reduced proportionally in the conversion of the plumb line displacement. Therefore, the method improves the accuracy of measurement, and accurately acquires the displacement of the suspension line and the change characteristics of the cable length under different stress effects.
The test sample band 2 is placed in the test frame, one end of the test sample band is fixed with the end part of the test frame, the other end of the test sample band is connected with the stainless steel cable, and the first and second suspension wires 5 are bound on the corresponding positions of the test sample band. Generally speaking, the first and second suspension lines 5 may be bound to positions near the front end and near the rear end of the test strip 2, respectively, and the first and second suspension lines 5 are perpendicular to the test strip 2 and the rack in the test rack in which the test strip 2 is placed. The plumb line 5 can be fixed on the test strip 2 after passing through a fixed point fixed to one of the pointers in the pointer gyro 7, and after being fixed, the vertical state of the plumb line 5 can still be ensured.
Preferably, the distance between the suspension line and the center of the pointer top compared with the distance between the ruler and the center of the pointer top is a transformation ratio delta L, and when the transformation ratio delta L is larger than 1, the amplification of the displacement delta L of the suspension line is realized and the reading is carried out.
The utility model creatively adopts a very common pointer gyroscope and a ruler as measuring tools, and has very low cost. But the amplification of the actual deviation value of the suspension line is realized through the proportional relation of the distance between the ruler and the center of the pointer gyroscope and the distance between the suspension line and the center of the pointer gyroscope, and meanwhile, the error is reduced, so that the measuring result has very accurate effect.
In addition, the pointer top 7 is adopted because the sample is not easy to read due to small stretching amount when being stressed, and reading errors can be caused. Therefore, by amplifying the amount of tension of the actual test tape 2 and reading the data, the error due to the reading can be reduced to some extent. In the test, the pointer gyroscope 7 is used for amplifying the stretching amount of the test sample belt 2 and reading the stretching amount, and the actual stretching amount of the test sample belt 2 is obtained after certain conversion is carried out on the data obtained by amplifying and reading.
Preferably, the first and second measuring units are fixed to the test strip 2 at positions that are equidistant from the first and second ends of the test strip, respectively. With this arrangement, when calculating the change in the length of the entire test sample tape 2, it is only necessary to add the displacement amounts of the fixed points measured by the first and second measuring means, and the calculation can be simplified to a great extent.
Preferably, the measuring ranges of the tension meter 3 and the hand-operated hoist 4 are both 5T; the tension meter 3 is an electronic tension meter. Because the measuring ranges of the tension meter 3 and the manual hoist 4 are both 5T, a load of 0-5T can be applied to one end of the test sample belt 2 through the manual hoist 4, and therefore the test can be conveniently carried out. When the test is carried out in the measuring process, the manual hoist 4 can be used for applying tension to the test sample belt 2, and the applied tension value can be directly obtained by observing the display reading of the electronic tension meter 3.
Preferably, the test rack further comprises a liquid nitrogen tank 6 arranged outside the sample placing rack, and when the inside of the sample placing rack is filled with liquid nitrogen, the test sample belt is ensured to be placed in a liquid nitrogen environment of 77K. It will be appreciated that the provision of the liquid nitrogen bath 6 allows the test strip 2 to be subjected to a variety of different test environments during the test. When the liquid nitrogen tank 6 is not filled with liquid nitrogen, the tensile property of the test sample tape 2 in the environment of 293K at normal temperature can be tested. When the liquid nitrogen tank 6 is filled with liquid nitrogen, the tensile properties of the test strip 2 in a liquid nitrogen environment, i.e., a 77K environment, can be tested. Meanwhile, when the applied load is unchanged, the shrinkage rate of the test sample tape 2 can be obtained according to the difference of the reading of the measurement unit in the normal temperature and the liquid nitrogen environment.
Specifically, an initial stress can be applied to the stainless steel cable by the hand hoist 4 so that the test sample belt 2 is in a state of being straight and not subjected to tensile deformation, and the reading of the measuring unit is recorded at the moment. And then, when liquid nitrogen is filled into the liquid nitrogen tank 6, the tension of the test sample belt is kept unchanged all the time, and the temperature of the test sample is waited to be reduced. The shrinkage of the test sample tape 2 from normal temperature to liquid nitrogen temperature is large, so that the test sample tape can be measured after being stably shrunk. At this time, the amount of contraction of the test strip 2 is obtained by measuring the change in the position of the plumb line 5 on the ruler 8. Further, the shrinkage of the test strip 2 is the amount of shrinkage divided by the length of the test strip 2.
Preferably, the sample rack 1 accommodates 10 meters of test strips 2; and the test sample tape 2 is a copper lining core or a long and short sample superconducting cable. Therefore, the tensile properties of the copper lining core and the long and short sample superconducting cables can be respectively tested and analyzed.
Compared with the prior art, the test frame for the tensile property of the superconducting cable has the advantages that the test sample belt can be horizontally placed on the test frame, the copper lining core and the superconducting cable can be respectively tested, the tensile property under different conditions such as normal temperature and liquid nitrogen environment can be obtained, the method is simple, the instrument is easy and convenient to use, the cost is low, and the test is accurate.
The applicant has described and illustrated embodiments of the present invention in detail with reference to the drawings attached hereto, but it should be understood by those skilled in the art that the above embodiments are merely preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for limiting the scope of the present invention, and on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the scope of the present invention.
Claims (10)
1. The utility model provides a superconductive cable tensile properties's test jig, includes sample rack (1), pulling force unit, measuring unit, test sample area (2), its characterized in that:
one end of the sample placing rack (1) is provided with a suspension platform for suspending the tension unit;
one end of the tension unit is fixed on the suspension platform, and the other end of the tension unit is fixedly connected with one end of the test sample belt and is used for applying load to the test sample belt (2) and measuring the load applied in the test process;
the test sample belt (2) is placed on the sample placing frame (1), one end of the test sample belt obtains test tension through the tension unit, and the other end of the test sample belt is fixed at the other end of the sample placing frame (1);
the measuring unit is bound with one or more points in the test sample belt (2) and is used for measuring the offset of the positions when the tension unit applies load and deforms.
2. A test jig for tensile properties of a superconducting cable according to claim 1, wherein:
the tension unit comprises a tension meter (3), a manual hoist (4), a pulley and a stainless steel cable; and the number of the first and second electrodes,
the tension meter is suspended on the suspension platform, and a manual hoist (4) is connected to the lower part of the tension meter;
one end of a stainless steel cable penetrates through the hand hoist (4) to serve as a tension providing part, and the other end of the stainless steel cable is fixedly connected with one end of the test sample belt (2) through a pulley.
3. A test jig for tensile properties of a superconducting cable according to claim 1, wherein:
the measuring unit comprises a first measuring unit and a second measuring unit; and the number of the first and second electrodes,
the first measuring unit and the second measuring unit respectively comprise a suspension line (5), a pointer gyroscope (7) and a ruler (8).
4. A test jig for tensile properties of a superconducting cable according to claim 3, wherein:
the suspension line (5) is suspended on the ceiling and vertically fixed on a corresponding position of the test sample belt through a pointer of the pointer gyroscope (7);
the pointer gyroscope (7) is shifted based on the offset of the corresponding position of the test sample tape;
and the ruler (8) is used for measuring the offset of the pointer gyroscope and converting the offset of the corresponding position of the test sample belt.
5. A test jig for tensile properties of a superconducting cable according to claim 4, wherein:
the pointer gyroscope and the ruler are placed on the first measuring platform and the second measuring platform, the center of the pointer gyroscope is rotatably fixed on the platforms, the pointer gyroscope is provided with three pointers which are respectively spaced by 120 degrees, and one pointer is fixedly connected with the suspension line.
6. A test jig for tensile properties of a superconducting cable according to claim 5, wherein:
and when the transformation ratio delta L is greater than 1, the displacement delta L of the suspension line is amplified and read.
7. A test jig for tensile properties of a superconducting cable according to claim 6, wherein:
the first measuring unit and the second measuring unit are fixed on the position on the test sample belt and are respectively equal in distance from the first end and the second end of the test sample belt.
8. A test jig for tensile properties of a superconducting cable according to claim 1, wherein:
the measuring ranges of the tension meter and the hand-operated hoist are both 5T; and the number of the first and second electrodes,
the tensiometer is an electronic tensiometer.
9. A test jig for tensile properties of a superconducting cable according to claim 1, wherein:
the test jig further comprises a liquid nitrogen groove (6) which is arranged outside the sample placing rack, and when the inside of the sample placing rack is filled with liquid nitrogen, the test sample belt is ensured to be placed in a 77K liquid nitrogen environment.
10. A test jig for tensile properties of a superconducting cable according to claim 1, wherein:
the sample placing rack is used for accommodating a 10-meter test sample belt; and the number of the first and second electrodes,
the test sample belt is a copper lining core or a long and short superconducting cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121414947.9U CN215894210U (en) | 2021-06-24 | 2021-06-24 | Test jig for tensile property of superconducting cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121414947.9U CN215894210U (en) | 2021-06-24 | 2021-06-24 | Test jig for tensile property of superconducting cable |
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| Publication Number | Publication Date |
|---|---|
| CN215894210U true CN215894210U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121414947.9U Active CN215894210U (en) | 2021-06-24 | 2021-06-24 | Test jig for tensile property of superconducting cable |
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| CN (1) | CN215894210U (en) |
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2021
- 2021-06-24 CN CN202121414947.9U patent/CN215894210U/en active Active
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