CN114964738A - Portable spring elastic coefficient measuring device and measuring method thereof - Google Patents
Portable spring elastic coefficient measuring device and measuring method thereof Download PDFInfo
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- CN114964738A CN114964738A CN202110219655.8A CN202110219655A CN114964738A CN 114964738 A CN114964738 A CN 114964738A CN 202110219655 A CN202110219655 A CN 202110219655A CN 114964738 A CN114964738 A CN 114964738A
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- 238000012360 testing method Methods 0.000 claims abstract description 38
- 238000006073 displacement reaction Methods 0.000 claims abstract description 25
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- 238000013461 design Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 abstract description 2
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- 238000005259 measurement Methods 0.000 description 6
- 230000005483 Hooke's law Effects 0.000 description 4
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
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Abstract
The invention relates to a portable spring elastic coefficient measuring device and a measuring method thereof. The invention aims to solve the technical problems of low precision and low intelligent degree of most of the existing spring elasticity coefficient measuring devices, and the second purpose of the invention is to solve the technical problem of narrow application range of most of the existing devices. The device adopts a worm and gear mechanism, and the worm has a self-locking function, so that the operation process can be kept and stabilized, the measured loading force and displacement data are more accurate, the loading force and displacement change are continuous, more experimental data can be measured, the obtained result is more accurate through curve fitting, the structure is simple, the precision is higher, and the operation is simple and convenient; a plurality of groups of ring grooves designed on the loading surface are suitable for testing compression springs of different models; the pull ring is more suitable for the extension spring, so that the application range is wider. The stable loading logic judgment is added, the unstable result generated by initial loading can be avoided, and the hand crank adopts a foldable design and is convenient to carry.
Description
Technical Field
The invention relates to a measuring device for spring parameters, in particular to a portable spring elasticity coefficient measuring device and a measuring method thereof.
Background
A spring is a mechanical part that works by elasticity and has important applications in most mechanical structures. The springs are various in types, and can be divided into cylindrical spiral springs, volute spiral springs, plate springs, special springs and the like according to the shapes, and can be divided into extension springs, compression springs, torsion springs and bending springs according to the stress property. Among them, the compression spring and the extension spring in the cylindrical coil spring are common and widely used. The elastic coefficient is an important parameter of the spring and directly determines the performance of the spring, so that the measurement of the elastic coefficient of the spring is of great significance to the detection and specific application of the spring, for example, in a vibration system, the elastic coefficient is an essential parameter for calculating and evaluating the vibration characteristic of the system.
At present, the spring elastic coefficient is mainly measured based on Hooke's law, and the ubiquitous defects of the measuring device are that the precision is not high, the intelligent degree is low, most of the measuring devices are only suitable for testing a certain spring, and the application range is narrow.
Disclosure of Invention
The invention aims to solve the technical problems of low precision and low intelligent degree of the existing spring elasticity coefficient measuring device, and the second purpose of the invention is to solve the technical problems of large size and narrow application range of the existing spring elasticity coefficient measuring device, and provides a portable spring elasticity coefficient measuring device and a measuring method thereof.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
a portable spring elastic coefficient measuring device is characterized in that: the device comprises a base, a push-pull force test disc, a sliding seat, an elasticity coefficient calculation display module, a hand-operated sliding power unit and a vernier caliper;
the base is L-shaped and comprises a vertical slideway and a horizontal spring mounting plane; the vertical slideway is C-shaped, and a rack is arranged at the opening of the vertical slideway; a first annular groove is formed in the horizontal spring mounting plane;
the push-pull force test disc is positioned above the horizontal spring mounting plane; a second annular groove which is coaxial with the first annular groove and has the same size is arranged on the bottom surface of the push-pull force test disc and is used for installing a compression spring to be tested;
the sliding seat is L-shaped and comprises a horizontal seat and a vertical plate; the vertical plate is matched with the vertical slideway and can slide along the vertical slideway; a support plate is arranged at the upper part of the vertical plate;
the push-pull force test disc is arranged at the lower part of the horizontal seat, and the horizontal spring installation plane, the push-pull force test disc and the horizontal seat are mutually parallel;
the elastic coefficient calculation display module is arranged on the horizontal seat and is electrically connected with the push-pull force test disc through a central hole in the horizontal seat;
the hand-operated sliding power unit comprises a combined gear, a worm, a hand crank and a combined gear supporting cover plate; the worm is arranged on the supporting plate; the combined gear comprises a worm wheel and a cylindrical gear which are arranged on the same rotating shaft, the worm wheel is meshed with the worm, the cylindrical gear is meshed with the rack, and two ends of the rotating shaft are respectively arranged on the combined gear supporting cover plate and the vertical plate; the hand crank is arranged at the end part of the worm;
the vernier caliper comprises a caliper and a vernier; the caliper is arranged on the side face of the vertical slideway; the vernier is arranged on the caliper, is fixedly connected with the side surface of the horizontal seat, is electrically connected with the elastic coefficient calculation display module, is used for sliding up and down along the caliper along with the horizontal seat, and displays the distance between the horizontal seat and the horizontal spring installation plane.
Furthermore, in order to realize the measurement of the elastic coefficients of the compression springs with different sizes, a plurality of first ring grooves are concentrically arranged on the horizontal spring mounting plane;
a plurality of second ring grooves are concentrically arranged on the bottom surface of the push-pull force test disc;
the multiple second ring grooves correspond to the multiple first ring grooves respectively and are used for installing compression springs to be tested with different sizes.
Furthermore, in order to realize the measurement of the elastic coefficient of the extension spring, pull rings are arranged at the centers of the first ring groove of the horizontal spring mounting plane and the second ring groove of the push-pull force test disc and are used for mounting the extension spring to be tested.
Further, in order to make the obtained elastic coefficient have higher precision, the elastic coefficient calculation display module comprises a logic judgment unit, a calculation unit, a display unit and a setting unit;
the logic judgment unit is used for judging whether the push-pull force F measured by the push-pull force test disc is greater than a stable loading set value or not, if not, the judgment is continued, and if so, the judgment is stopped;
the computing unit is used for recording the push-pull force F larger than the stable loading set value 0 And the corresponding displacement x measured by the cursor 0 As a calculation reference, continuously loading the push-pull force F and the displacement x which are measured in real time, calculating in real time through the following formula, and obtaining the elastic coefficient k of the spring to be measured through curve fitting
k＝△F/△x
△F＝∣F-F 0 ∣
△x＝∣x-x 0 ∣；
The display unit is used for displaying the obtained elastic coefficient k in real time;
the setting unit is used for setting the metering unit and the stable loading set value.
Further, in order to make the whole size less, portable, the crank is Z shape, its tip through the cylindric lock with the tip of worm is articulated for the folding of crank.
Further, for convenience of installation, the pull ring is connected with the horizontal spring installation plane and the push-pull force test disc through threads.
The invention also provides a measuring method of the portable spring elasticity coefficient measuring device, which is characterized in that: based on above-mentioned portable spring elastic coefficient measuring device, including the following step:
1) setting a metering unit and a stable loading set value;
2) measuring the push-pull force F and the corresponding displacement x of the spring in real time;
3) judging whether the measured push-pull force F is larger than a stable loading set value or not, if not, continuously judging, and if so, stopping judging;
4) recording push-pull force F greater than steady loading set value 0 And corresponding displacement x 0 As a calculation reference, continuously loading the push-pull force F and the displacement x which are measured in real time, calculating in real time through the following formula, and obtaining the elastic coefficient k of the spring to be measured through curve fitting
k＝△F/△x
△F＝∣F-F 0 ∣
△x＝∣x-x 0 ∣；
5) The resulting elastic coefficient k is displayed in real time.
Compared with the prior art, the invention has the following beneficial effects:
1. the portable spring elastic coefficient measuring device provided by the invention adopts the worm gear and worm mechanism, and the worm has a self-locking function, so that the operation process can be kept and stabilized, the measured loading force (push-pull force data) and displacement data are more accurate, the loading force and displacement change are continuous, more experimental data can be measured, the obtained result is more accurate through curve fitting, the structure is simple, the precision is higher, and the operation is simple and convenient.
2. The portable spring elasticity coefficient measuring device provided by the invention has the advantages that the multiple groups of ring grooves designed on the loading surface are suitable for testing compression springs of different types (different sizes and different lengths).
3. The portable spring elasticity coefficient measuring device provided by the invention is more suitable for the extension spring by additionally arranging the pull ring, so that the application range is wider.
4. The portable spring elastic coefficient measuring device provided by the invention is added with stable loading logic judgment in the aspect of hardware, so that an unstable result generated by initial loading can be avoided, the reliability of obtained data is higher, and the finally obtained elastic coefficient is higher in precision.
5. The portable spring elasticity coefficient measuring device provided by the invention is compact in overall design, and the hand crank is foldable, so that the overall size is small, the portable spring elasticity coefficient measuring device is convenient to carry and suitable for field operation.
Drawings
FIG. 1 is a schematic structural diagram of a portable spring rate measuring device according to the present invention;
FIG. 2 is a partially exploded view of the portable spring rate measurement device of the present invention;
FIG. 3 is a schematic diagram of the elastic coefficient calculation display module of the portable spring elastic coefficient measuring device of the present invention;
FIG. 4 is a flow chart of the operation of the display module for calculating the elastic modulus of the portable device for measuring the elastic modulus of a spring according to the present invention;
FIG. 5 is a schematic structural diagram of the portable spring elastic coefficient measuring device of the present invention in an unfolded state of the hand crank;
FIG. 6 is a schematic structural view of the portable spring elastic coefficient measuring device of the present invention in a folded state;
FIG. 7 is a schematic view of a portable spring constant measuring device according to the present invention;
FIG. 8 is a schematic structural view of the pull ring and the tested tension spring of FIG. 7;
description of reference numerals:
1-base, 11-vertical slideway, 12-rack, 13-horizontal spring mounting plane; 2-a push-pull force test disc; 3-sliding seat, 31-horizontal seat, 32-vertical plate, 33-supporting plate; 4-elastic coefficient calculation display module; 5-hand-operated sliding power unit, 51-combined gear, 511-worm wheel, 512-cylindrical gear, 52-worm, 53-hand crank, 54-combined gear supporting cover plate; 6-caliper, 7-vernier; 8-pull ring.
Detailed Description
The invention is further described below with reference to the figures and examples.
A portable spring elasticity coefficient measuring device is shown in figures 1 and 2 and comprises a base 1, a push-pull force testing disc 2, a sliding seat 3, an elasticity coefficient calculation and display module 4, a hand-operated sliding power unit 5 and a vernier caliper; the base 1 is L-shaped and comprises a vertical slideway 11 and a horizontal spring mounting plane 13; the vertical slideway 11 is C-shaped, and a rack 12 is arranged at the opening of the vertical slideway; a first annular groove is formed in the horizontal spring mounting plane 13; the push-pull force test disc 2 is positioned above the horizontal spring mounting plane 13; a second annular groove which is coaxial with the first annular groove and has the same size with the first annular groove is formed in the bottom surface of the push-pull force test disc 2 and used for placing a compression spring to be tested; the sliding seat 3 is L-shaped and comprises a horizontal seat 31 and a vertical plate 32; the vertical plate 32 is matched with the vertical slideway 11 and can slide along the vertical slideway 11; a support plate 33 is arranged on the upper part of the vertical plate 32; the push-pull force test disc 2 is arranged at the lower part of the horizontal seat 31, and the horizontal spring installation plane 13, the push-pull force test disc 2 and the horizontal seat 31 are parallel to each other and are vertical to the vertical slideway 11; the elastic coefficient calculation display module 4 is mounted on the horizontal seat 31 and electrically connected with the push-pull force test disk 2 through a central hole in the horizontal seat 31.
The hand-operated sliding power unit 5 comprises a combined gear 51, a worm 52, a hand crank 53 and a combined gear supporting cover plate 54; the worm 52 is arranged at the mounting hole on the supporting plate 33, and the worm 52 can rotate; the combined gear 51 comprises a worm wheel 511 and a cylindrical gear 512 which are arranged on the same rotating shaft, the worm wheel 511 is meshed with the worm 52, the cylindrical gear 512 is meshed with the rack 12, and two ends of the rotating shaft are respectively arranged on a combined gear supporting cover plate 54 and the vertical plate 32 to jointly support the combined gear 51 to rotate; a crank 53 is provided at an end of the worm 52;
the vernier caliper comprises a caliper 6 and a vernier 7; the caliper 6 is mounted on the side face of the vertical slideway 11 through a bolt; the vernier 7 is sleeved on the caliper 6, connected with the side surface of the horizontal seat 31 through a bolt, and electrically connected with the elastic coefficient calculation display module 4, and is used for sliding up and down along the caliper 6 along the horizontal seat 31, and displaying the distance between the horizontal seat 31 and the horizontal spring installation plane 13, namely when the sliding seat 3 slides along the vertical slide 11 of the base 1, the vernier 7 slides up and down along the caliper 6 along the sliding seat 3, and indicates the displacement change between the sliding seat 3 and the horizontal spring installation plane 13 of the base 1.
In order to realize the measurement of the elastic coefficients of the compression springs with different sizes, a plurality of first annular grooves are concentrically arranged on the horizontal spring mounting plane 13; a plurality of second ring grooves which are coaxial with the first ring grooves are concentrically arranged on the bottom surface of the push-pull force test disc 2; the multiple second ring grooves correspond to the multiple first ring grooves respectively and are used for installing compression springs to be tested with different sizes.
As shown in fig. 5 and 6, the hand crank 53 is Z-shaped, the end of the hand crank 53 is hinged to the end of the worm 52 through a cylindrical pin, and the hand crank 53 can rotate around the cylindrical pin, so that the hand crank 53 can be folded when not in use, the size of the device is reduced, and the carrying is convenient.
As shown in fig. 7 and 8, the portable spring elastic coefficient measuring device is also applicable to an extension spring, and the pull ring 8 is additionally installed at the center of the first ring groove of the horizontal spring installation plane 13 and the second ring groove of the push-pull force test disc 2 through threads, so that the measurement of the elastic coefficient of the extension spring can be realized.
The elastic coefficient calculation display module 4, as shown in fig. 3 and 4, includes a logic judgment unit, a calculation unit, a display unit, and a setting unit; the logic judgment unit is used for judging whether the push-pull force F measured by the push-pull force test disc 2 is greater than a stable loading set value or not, if not, the judgment is continued, and if so, the judgment is stopped; the computing unit is used for recording the push-pull force F larger than the stable loading set value 0 And the corresponding displacement x measured by the cursor 7 0 And taking the measured push-pull force F and the measured displacement x as calculation reference, continuously loading the push-pull force F and the measured displacement x, and obtaining the elastic coefficient k of the spring to be measured through real-time calculation and curve fitting according to the following formula (Hooke's law)
k＝△F/△x
△F＝∣F-F 0 ∣
△x＝∣x-x 0 ∣；
The display unit is used for displaying the elastic coefficient k in real time; the setting unit is used for setting a metering unit and the stable loading set value.
A measuring method of a portable spring elasticity coefficient device is based on the portable spring elasticity coefficient measuring device and comprises the following steps:
1) setting a metering unit and a stable loading set value;
2) measuring the push-pull force F and the corresponding displacement x of the spring in real time;
3) judging whether the measured push-pull force F is larger than a stable loading set value or not, if not, continuously judging, and if so, stopping judging;
4) recording push-pull force F greater than steady loading set value 0 And corresponding displacement x 0 As a calculation reference, continuously loading the push-pull force F and the displacement x which are measured in real time, calculating in real time through the following formula, and obtaining the elastic coefficient k of the spring to be measured through curve fitting
k＝△F/△x
△F＝∣F-F 0 ∣
△x＝∣x-x 0 ∣；
5) And displaying the calculated elastic coefficient k in real time.
In other words, the push-pull force F input is firstly measured by the push-pull force test disc 2, and then the input push-pull force F is judged, whether the input push-pull force F is larger than the stable loading set value or not is judged, and if the input push-pull force F is larger than the stable loading set value, the input push-pull force F is recorded as the push-pull force F 0 And a displacement x 0 Taking the initial record value as a calculation reference and stopping interpretation, otherwise, continuously interpreting the input push-pull force F; then continuously loading, calculating in real time by hooke's law and combining curve fitting to obtain the spring elasticity coefficient, and finally displaying the real-time elasticity coefficient value through a display module.
The working mode is as follows:
when the portable spring elasticity coefficient measuring device works, the hand crank 53 is shaken to drive the worm 52 to rotate, power is transmitted to the combined gear 51 by being meshed with the worm gear 511, the cylindrical gear 512 rotates and is meshed with the rack 12 to move up and down, the sliding seat 3 and the elasticity coefficient calculation display module 4 and the vernier 7 which are installed on the sliding seat are driven to move up and down, the push-pull force testing disc 2 moves up and down due to being connected with the elasticity coefficient calculation display module 4, the distance between the push-pull force testing disc 2 and the horizontal spring installation plane 13 of the base 1 is changed, compression of a compression spring which is installed on a concentric ring groove is realized (the distance between the push-pull force testing disc 2 and the horizontal spring installation plane 13 is slightly larger than the tested spring), the tested spring is put into a corresponding ring groove according to the diameter, the handle 53 is shaken to the opposite direction, and the distance between the push-pull force testing disc 2 and the horizontal spring installation plane 13 is reduced, until the elastic coefficient calculation display module 4 displays that the numerical value of exerting force on the spring begins to change from 0, the spring begins to be compressed at the moment, the vernier 7 can be set to zero to display the changing displacement of the spring, the spring is further compressed, a plurality of groups of pressure and displacement numerical values can be recorded according to the situation, and the elastic coefficient of the spring can be simply and conveniently obtained according to the curve fitting result by combining Hooke's law.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (7)
1. A portable spring elastic coefficient measuring device is characterized in that: the device comprises a base (1), a push-pull force test disc (2), a sliding seat (3), an elastic coefficient calculation display module (4), a hand-operated sliding power unit (5) and a vernier caliper;
the base (1) is L-shaped and comprises a vertical slide way (11) and a horizontal spring mounting plane (13); the vertical slideway (11) is C-shaped, and a rack (12) is arranged at the opening of the vertical slideway; a first annular groove is formed in the horizontal spring mounting plane (13);
the push-pull force test disc (2) is positioned above the horizontal spring mounting plane (13); a second annular groove which is coaxial with the first annular groove and has the same size is arranged on the bottom surface of the push-pull force test disc (2) and is used for installing a compression spring to be tested;
the sliding seat (3) is L-shaped and comprises a horizontal seat (31) and a vertical plate (32); the vertical plate (32) is matched with the vertical slideway (11) and can slide along the vertical slideway (11); a support plate (33) is arranged at the upper part of the vertical plate (32);
the push-pull force test disc (2) is arranged at the lower part of the horizontal seat (31), and the horizontal spring installation plane (13), the push-pull force test disc (2) and the horizontal seat (31) are parallel to each other;
the elasticity coefficient calculation display module (4) is arranged on the horizontal seat (31) and is electrically connected with the push-pull force test disc (2) through a central hole in the horizontal seat (31);
the hand-operated sliding power unit (5) comprises a combined gear (51), a worm (52), a hand crank (53) and a combined gear supporting cover plate (54); a worm (52) is mounted on the support plate (33); the combined gear (51) comprises a worm wheel (511) and a cylindrical gear (512) which are arranged on the same rotating shaft, the worm wheel (511) is meshed with the worm (52), the cylindrical gear (512) is meshed with the rack (12), and two ends of the rotating shaft are respectively arranged on a combined gear supporting cover plate (54) and the vertical plate (32); the hand crank (53) is arranged at the end part of the worm (52);
the vernier caliper comprises a caliper (6) and a vernier (7); the caliper (6) is arranged on the side surface of the vertical slideway (11); the vernier (7) is arranged on the caliper (6), fixedly connected with the side face of the horizontal seat (31), electrically connected with the elastic coefficient calculation display module (4), and used for sliding up and down along the caliper (6) along with the horizontal seat (31) and displaying the distance between the horizontal seat (31) and the horizontal spring installation plane (13).
2. The portable spring rate measuring device according to claim 1, wherein:
a plurality of first ring grooves are concentrically arranged on the horizontal spring mounting plane (13);
a plurality of second ring grooves are concentrically arranged on the bottom surface of the push-pull force test disc (2);
the multiple second ring grooves correspond to the multiple first ring grooves respectively and are used for installing compression springs to be tested with different sizes.
3. The portable spring rate measuring device according to claim 1, wherein:
and pull rings (8) are arranged at the centers of the first ring groove of the horizontal spring mounting plane (13) and the second ring groove of the push-pull force testing disc (2) and are used for mounting the tension spring to be tested.
4. A portable spring rate measuring device according to any one of claims 1 to 3, wherein:
the elasticity coefficient calculation display module (4) comprises a logic judgment unit, a calculation unit, a display unit and a setting unit;
the logic judgment unit is used for judging whether the push-pull force F measured by the push-pull force test disc (2) is larger than a stable loading set value or not, if not, the judgment is continued, and if so, the judgment is stopped;
the computing unit is used for recording the push-pull force F larger than the stable loading set value 0 And the corresponding displacement x measured by the cursor (7) 0 Taking the measured push-pull force F and the measured displacement x as the calculation reference, continuously loading the push-pull force F and the measured displacement x, calculating the elastic coefficient k of the spring to be measured in real time through the following formula, and obtaining the elastic coefficient k of the spring to be measured through curve fitting
k＝△F/△x
△F＝∣F-F 0 ∣
△x＝∣x-x 0 ∣；
The display unit is used for displaying the obtained elastic coefficient k in real time;
the setting unit is used for setting a metering unit and the stable loading set value.
5. The portable spring rate measuring device according to claim 1, wherein:
the hand crank (53) is Z-shaped, and the end part of the hand crank (53) is hinged with the end part of the worm (52) through a cylindrical pin and is used for folding the hand crank (53).
6. The portable spring rate measuring device according to claim 3, wherein:
the pull ring (8) is connected with the horizontal spring mounting plane (13) and the push-pull force test disc (2) through threads.
7. A measuring method of a portable spring elasticity coefficient measuring device is characterized in that: the portable spring rate measuring device according to any one of claims 1 to 6, comprising the steps of:
1) setting a metering unit and a stable loading set value;
2) measuring the push-pull force F and the corresponding displacement x of the spring in real time;
3) judging whether the measured push-pull force F is larger than a stable loading set value or not, if not, continuously judging, and if so, stopping judging;
4) recording push-pull force F greater than stable loading set value 0 And corresponding displacement x 0 As a calculation reference, continuously loading the push-pull force F and the displacement x which are measured in real time, calculating in real time through the following formula, and obtaining the elastic coefficient k of the spring to be measured through curve fitting
k＝△F/△x
△F＝∣F-F 0 ∣
△x＝∣x-x 0 ∣；
5) The resulting elastic coefficient k is displayed in real time.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117969085A (en) * | 2024-03-29 | 2024-05-03 | 中国科学院西安光学精密机械研究所 | Worm gear meshing relationship measuring device of turntable and high-precision control method |
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| CN209727398U (en) * | 2019-05-28 | 2019-12-03 | 海安东洋弹簧有限公司 | A kind of device convenient for detection spring coefficient of elasticity |
| CN110595707A (en) * | 2019-09-29 | 2019-12-20 | 袁伟伟 | Equipment for detecting elastic coefficient of cylindrical spring |
| CN111157458A (en) * | 2020-02-18 | 2020-05-15 | 中国科学技术大学 | Photoelastic coefficient measuring instrument for optical resin material |
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