CN111997587B - Experimental device for detecting measurement accuracy of sensor of card measuring instrument - Google Patents
Experimental device for detecting measurement accuracy of sensor of card measuring instrument Download PDFInfo
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- CN111997587B CN111997587B CN202010892578.8A CN202010892578A CN111997587B CN 111997587 B CN111997587 B CN 111997587B CN 202010892578 A CN202010892578 A CN 202010892578A CN 111997587 B CN111997587 B CN 111997587B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
The invention discloses an experimental device for testing the measurement accuracy of a sensor of a card measuring instrument, which mainly comprises a base, a first support, a second support, a support frame, a vernier disc, a main nut, a driving shaft, a dial, a shaft assembly for tensile detection, a shaft for rotary detection, an adapter and a spring. The first support, the second support and the support frame are all fixed on the base, the vernier disc is fixed on the left side of the support frame, the support frame is sleeved with the main nut from the right side, the spring and the dial are arranged on the right side of the driving shaft and penetrate through the vernier disc to be connected with the main nut, and two sides of the shaft for detection are respectively connected with the driving shaft and the adapter. The card measuring instrument sensor is fixed on the first support and the second support, and the lower joint of the sensor is connected with the adapter. The driving shaft is rotated at the right end of the driving shaft, so that the lower joint of the sensor can be driven to move with corresponding precision through the shaft for detection and the adapter, and the precision of the sensor can be measured.
Description
Technical Field
The invention relates to an experimental device for detecting the measurement accuracy of a sensor, in particular to an experimental device for detecting the measurement accuracy of a sensor of a card measuring instrument.
Background
The card measuring instrument is a short-name of a digital point card measuring instrument, and generally comprises a magnetic locator, a weighting rod, a telescopic rod, an oscillator, an upper spring spear anchor, a sensor, a lower spring anchor and a guide shoe which are sequentially connected, wherein the card measuring instrument is provided with two spring anchors (the upper spring anchor and the lower spring anchor) which are arranged in a measured tubular column through a cable; when external force (pulling pressure or torsion force) is applied to the pipe column, the pipe column can resist the applied external force, so that the pipe column can generate corresponding elastic deformation while resisting the external force, the deformation of the pipe column is simultaneously transmitted to the upper spring anchor and the lower spring anchor of the card measuring instrument, and because a sensor is arranged between the upper spring anchor and the lower spring anchor and a distance exists between the upper spring anchor and the lower spring anchor, the deformation signals of the pipe column received by the upper spring anchor and the lower spring anchor have slight difference and are transmitted to a ground instrument through the sensor and a vibrator, the ground instrument reflects the received signals on a dial plate after processing, and at the moment, a dial plate pointer rotates by an angle, so that whether the pipe column is clamped or not at the spring anchor is reflected; releasing external force to restore the tubular column, continuing to put the instrument deep into the tubular column to measure the clamp, and when the external force is applied to the tubular column and the ground dial pointer does not react, indicating that the clamping point of the tubular column is on the upper part of the clamp measuring instrument; and lifting the instrument to continuously repeat the operation to measure the card of the tubular column.
When the pipe column is lifted and measured, the upper spring anchor and the lower spring anchor can generate axial displacement along with the axial deformation of the pipe column, so that a sensor clamped between the upper spring anchor and the lower spring anchor generates tiny axial displacement, and the deformation of 0.025mm in compression or tensile deformation within the range of 1.5m can be detected; during torsion measurement, the upper spring anchor and the lower spring anchor can generate circumferential displacement along with the rotation deformation of the pipe column, so that a sensor clamped between the upper spring anchor and the lower spring anchor generates tiny rotation displacement, and the deformation amount of 0.5 degree of torsion within the range of 1.5m can be detected.
In the case of no field condition, how to check whether the sensor has such measurement accuracy is an urgent problem to be solved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an experimental device for testing the measurement accuracy of a sensor of a card measuring instrument, which is used for testing the accuracy of the sensor of the card measuring instrument under the condition that the sensor has extremely tiny compression/tension deformation or torsion deformation.
In order to solve the technical problems, the invention adopts the technical scheme that: an experimental device for testing the measuring accuracy of a sensor of a card measuring instrument is characterized in that a first support, a second support and a support for mounting a detecting component for horizontally clamping the sensor of the card measuring instrument are sequentially fixed along the length direction of a base, a vernier disc is fixed on the support adjacent to the second support, the support and the vernier disc are provided with horizontal center holes, a main nut is positioned on the support far away from the second support, the main nut is sleeved in the center hole of the support and fixed on the support through a screw, one end of a driving shaft is provided with a flange for fixing with a shaft for detection, the other end of the driving shaft is provided with an external thread, the driving shaft is sleeved with a compression spring and a dial, the dial is fixed on the driving shaft, the compression spring is positioned between the flange on the driving shaft and the dial, the external thread end of the driving shaft sequentially passes through the center holes of the vernier disc and the support and is connected with the main nut through a thread, contacting the dial with the vernier dial; the adapter is a cylinder with internal threads at two ends, one end is used for installing and fixing the lower joint of the sensor, the other end is used for installing a shaft for detection, and the shaft for detection comprises a shaft component for tensile detection and a shaft for rotation detection which are used independently; the shaft assembly for tensile detection comprises a shaft for tensile detection, a bearing shaft, a bidirectional plane thrust bearing and a positioning nut, wherein one end of the shaft for tensile detection is fixed with a flange plate on a driving shaft, the other end of the shaft for tensile detection is fixed with the bearing shaft, the bidirectional plane thrust bearing is sleeved on the bearing shaft, the positioning nut with external threads is sleeved on the shaft for tensile detection, the bearing shaft and the bidirectional plane thrust bearing are arranged in an adapter and are connected with internal threads of the adapter through the external threads on the positioning nut, and the bidirectional plane thrust bearing is compressed; the rotation detection shaft is a cylinder with an external thread at one end, the external thread at one end of the rotation detection shaft is in threaded connection with the adapter, and the other end of the rotation detection shaft is fixed with a flange plate on the driving shaft.
The top ends of the first bracket and the second bracket are provided with hose clamps for fixing the card measuring instrument sensor.
After the first support and the second support are provided with the card measuring instrument sensors, the central shafts of the card measuring instrument sensors are coaxial with the central holes in the support frame and the vernier disc.
The dial is fixed on the driving shaft through a positioning screw.
Preferably, the central angle subtended by two adjacent lines on the dial is 1 degree, and the total number of the lines is 360; the centering angle of two adjacent lines on the vernier disk is 59', and 121 graduation lines are totally arranged; the matching screw thread of the driving shaft and the main nut adopts M30x1 screw thread, the screw pitch is 1mm, and when the vernier dial and the dial rotate relatively for 9 degrees, the displacement of the driving shaft relative to the axial direction of the main nut is 0.025 mm.
The invention has the beneficial effects that: the precise axial micro-displacement can be provided for the sensor, and the operation is simple, convenient and easy to realize; the sensor can be provided with accurate circumferential micro-torsion; through the integrated design, on the same whole piece, through changing individual spare part, realized sensor axial micrometric displacement inspection function and the little torsion inspection function's of circumferencial direction fast switch-over, the cost is reduced has reduced the complexity of operation.
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus for testing the measurement accuracy of a card-measuring instrument sensor according to the present invention.
FIG. 2 is another schematic view of the angle structure of the experimental apparatus for testing the measurement accuracy of the card-measuring instrument sensor according to the present invention.
FIG. 3 is a schematic cross-sectional view of an experimental apparatus for testing the measurement accuracy of a card-measuring instrument sensor according to the present invention.
FIG. 4 is a schematic structural diagram of a sensor mounted on the experimental device for testing the measurement accuracy of the card measuring instrument sensor.
Fig. 5 is a schematic structural view of a shaft assembly for tensile testing of the experimental apparatus for testing the measurement accuracy of the card-measuring instrument sensor according to the present invention.
Fig. 6 is a schematic structural view of a rotation detection shaft of the experimental apparatus for checking the measurement accuracy of the card meter sensor according to the present invention.
In the figures, 1-first stent; 2-a base; 3-an adapter; 4-stretching the shaft assembly for detection; 5-M4 screw; 6-driving shaft; 7-a compression spring; 8-a set screw; 9-dial plate; 10-a vernier disk; 11-a support frame; 12-M4 screw; 13-M4 screw; 14-a main nut; 15-a bearing shaft; 16-bidirectional planar thrust bearing; 17-small shaft sleeve; 18-large shaft sleeve; 19-a positioning nut; 20-a shaft for tensile testing; 21-M4 screw holes; 22-a rotation detection shaft; 23-M4 screw holes; 24-second bracket.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in figures 1-6, the experimental device for testing the measuring accuracy of the card measuring instrument sensor of the invention is characterized in that a first bracket 1, a second bracket 24 and a support frame 11 for installing a detecting component for horizontally clamping the card measuring instrument sensor are sequentially fixed along the length direction of a base 2, a vernier disc 10 is fixed on the support frame 11 adjacent to the side of the second bracket 24, the support frame 11 and the vernier disc 10 are provided with horizontal center holes, a main nut 14 is positioned on the support frame 11 far away from the side of the second bracket 24, is sleeved in the center hole of the support frame 11 and is fixed on the support frame 11 through a screw 13, one end of a driving shaft 6 is provided with a flange plate for fixing with a shaft for detection, the other end is provided with external threads, a compression spring 7 and a dial plate 9 are sleeved on the driving shaft 6, the dial plate 9 is fixed on the driving shaft 6, the compression spring 7 is positioned between the flange plate on the driving shaft 6 and the dial plate 9, the external thread end of the driving shaft 6 sequentially passes through the central holes of the vernier disk 10 and the support frame 11 and is in threaded connection with the main nut 14, so that the dial 9 is in contact with the vernier disk 10; the adapter 3 is a cylinder with internal threads at two ends, one end is used for installing and fixing a lower joint of the sensor, the other end is used for installing a shaft for detection, and the shaft for detection comprises a shaft component 4 for tensile detection and a shaft 22 for rotation detection which are used independently; the shaft assembly for stretching detection comprises a shaft 20 for stretching detection, a bearing shaft 15, a bidirectional plane thrust bearing 16 and a positioning nut 19, one end of the shaft 20 for stretching detection is fixed with a flange plate on the driving shaft 6, the other end of the shaft is fixed with the bearing shaft 15, the bidirectional plane thrust bearing 16 is sleeved on the bearing shaft 15, the positioning nut 19 with external threads is sleeved on the shaft 20 for stretching detection, the bearing shaft 15 and the bidirectional plane thrust bearing 16 are arranged in the adapter 3 and are connected with the internal threads of the adapter 3 through the external threads on the positioning nut 19, and the bidirectional plane thrust bearing 16 is compressed; the rotation detection shaft 22 is a cylinder with an external thread at one end, the external thread at one end of the rotation detection shaft 22 is in threaded connection with the adapter 3, and the other end of the rotation detection shaft is fixed with a flange plate on the driving shaft 6.
The top ends of the first bracket 1 and the second bracket 24 are provided with hose clamps for fixing the card measuring instrument sensor. After the first bracket 1 and the second bracket 24 are provided with the card measuring instrument sensors, the central axes of the card measuring instrument sensors are coaxial with the central holes on the support frame 11 and the vernier dial 10.
The dial plate 9 is fixed on the driving shaft 6 through a positioning screw 8.
In this embodiment, the central angle subtended by two adjacent lines on the dial 9 is 1 °, and 360 scribed lines are counted; the centering angle of two adjacent lines on the vernier dial 10 is 59', and 121 graduation lines are totally arranged; the matching screw thread of the driving shaft 6 and the main nut 14 adopts M30x1 screw thread, the screw pitch is 1mm, and when the vernier dial 10 and the dial 9 rotate relatively for 9 degrees, the displacement of the driving shaft 6 relative to the axial direction of the main nut 14 is 0.025 mm.
Specifically, when the device is used for tension and compression test of the sensor, the first bracket 1, the second bracket 24 and the support frame 11 are respectively fixed on the base 2; the vernier disk 10 is fixed on the support frame 11 through two M4 screws 12; the main nut 14 is sleeved in the central hole of the support frame 11 and is fixed on the support frame 11 through four M4 screws 13; the right side of the driving shaft 6 is sleeved with a compression spring 7 and a dial 9 in sequence, passes through a central hole of the vernier disk 10 and is in threaded connection with a main nut 14 through M30x 1; the positioning screw 8 is screwed into a threaded hole on the thin shaft on the left side of the dial 9 and is used for fixing the positions of the dial 9 and the driving shaft 6 in the circumferential direction; the left side of the shaft assembly 4 for tensile detection is arranged on the right side of the adapter 3 and is connected with the internal thread on the right side of the adapter 3 through the external thread on the positioning nut 19 to tightly press the bidirectional plane thrust bearing 16, and the right side of the shaft assembly 4 for tensile detection is arranged on the left side of the driving shaft 6 and is fixed with the corresponding threaded hole on the driving shaft 6 through 4M 4 screw holes 21; the lower joint of the sensor is arranged at the left side of the adapter 3, and the sensor is fixed on the two brackets by the throat hoop.
When the device is used for the torsion detection of the sensor, on the basis of a pulling and pressing detection device of the sensor, the main nut 14 fixed at the right end of the main nut 14 is detached from the four M4 screws 13 of the support frame 11, so that the main nut 14 can be regarded as a whole with the driving shaft 6 and can rotate relatively in the central hole of the support frame 11 without generating axial displacement; the shaft assembly 4 for tensile detection is dismounted, the shaft assembly 4 for tensile detection is replaced by a shaft 22 for rotary detection, the left external thread of the shaft 22 for rotary detection is arranged on the right side of the adapter 3, the right side of the shaft 22 for rotary detection is arranged on the left side of the driving shaft 6, and the shaft 22 for rotary detection and the corresponding threaded hole on the driving shaft 6 are fixed together through 4M 4 screw holes 23; similarly, the lower joint of the sensor is arranged at the left side of the adapter 3, and the sensor is fixed on the two brackets.
Tension and compression detection
When the experimental device is used for detecting high-precision linear displacement during axial tension or compression of the sensor, the configuration of the experimental device is shown in figure 1, and the working state is shown in figure 4.
During operation, fix the sensor on two supports with larynx hoop (can replace with other article), guarantee that sensor and support can not take place relative movement, sensor right-hand member lower clutch is together fixed with the experimental apparatus adapter this moment. The bidirectional plane thrust bearing is used for transmitting axial load when the detection equipment stretches or compresses the sensor; the shaft for stretching detection is connected with the driving shaft through a screw; the positioning nut is connected to the adapter through threads, and when the driving shaft moves to the left side or the right side, the adapter drives the lower connector on the sensor to move in the same direction as the axial displacement of the driving shaft. The compression spring ensures the dial to be in close contact with the vernier dial, so that the reading is more accurate. The center angle of two adjacent lines on the dial is 1 degree, and 360 scribed lines are formed; the centering angle of two adjacent lines on the vernier disk is 59', and 121 graduation lines are totally arranged; the matching screw thread of the driving shaft and the main nut adopts M30x1 screw thread, the screw pitch is 1mm, and when the vernier dial and the dial rotate relatively for 9 degrees, the displacement of the driving shaft relative to the axial direction of the main nut is 0.025 mm. The main nut is fixed on the support frame through 4M 4 screws. When the device is used, the right end of the driving shaft is rotated clockwise or anticlockwise, so that the dial and the vernier disk rotate 9 degrees relatively, and the correctness of the displacement of 0.025mm in tension or compression measured by the sensor can be checked.
Second, torsion detection
When verifying the correctness of the sensor in detecting the torsion angle, the shaft assembly for tension detection shown in fig. 5 needs to be replaced with a shaft for rotation detection shown in fig. 6, and the shaft for rotation detection has the functions of a positioning nut and a connecting shaft; and 4M 4 screws for fixing the main nut on the support frame are removed, the outer part of the main nut can rotate relatively in the inner hole of the support frame, and the inner hole of the main nut is still in threaded connection with the outer side of the driving shaft, which is equivalent to that the main nut and the driving shaft are fixed together. The scale that has already aligned on dial and the vernier disk is regarded as initial alignment scale, slightly rotates driving shaft right-hand member for new alignment scale on dial and the vernier disk and initial alignment scale difference 30 scales, be equivalent to that the dial that the circumferencial direction links firmly on the driving shaft has rotated 0.5 for the vernier disk promptly, can inspect the detection effect that the sensor has little the twist reverse.
In the laboratory environment, the invention provides an axial micro displacement or circumferential micro torsion for the sensor, and checks whether the identification precision of the sensor meets the technical requirements: can provide a 0.025mm axial micro-displacement for the sensor; the sensor can be provided with a 0.5-degree circumferential micro-torsion; by replacing individual parts, the quick switching between the axial micro displacement and the circumferential micro torsion can be realized. The experimental device has simple structure and can be used for realizing the high-precision displacement detection of the tension or compression of the sensor in the axial direction; and part of parts are adjusted, so that the angle detection of the sensor in the micro-torsion state can be realized.
The invention makes the sensor and the rotating shaft coaxial; the dial and the vernier dial are used for observing the rotating angle; the spring is used for ensuring the attachment of the dial and the vernier disc under the condition of axial displacement; during tension and compression detection, the shaft assembly for tension detection is used for ensuring that the sensor cannot generate torsional deformation during tension and compression; when the torsion is detected, the shaft for rotation detection is replaced, and the torsion detection can be rapidly realized.
In summary, the disclosure of the present invention is not limited to the above-mentioned embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (5)
1. An experimental device for testing the measuring accuracy of a sensor of a card measuring instrument is characterized in that a first support (1) and a second support (24) which are used for horizontally clamping the sensor of the card measuring instrument and a support frame (11) which is used for installing a detecting part are sequentially fixed along the length direction of a base (2), a vernier disk (10) is fixed on the support frame (11) which is close to the side of the second support (24), the support frame (11) and the vernier disk (10) are provided with horizontal center holes, a main nut (14) is positioned on the support frame (11) which is far away from the side of the second support (24), is sleeved in the center hole of the support frame (11) and is fixed on the support frame (11) through a screw (13), one end of a driving shaft (6) is provided with a flange plate which is used for fixing with a shaft for detection, the other end of the driving shaft is provided with an external thread, the driving shaft (6) is sleeved with a compression spring (7) and a dial (9), the dial (9) is fixed on the driving shaft (6), the compression spring (7) is positioned between a flange plate on the driving shaft (6) and the dial (9), and the external thread end of the driving shaft (6) sequentially passes through the vernier disc (10) and the central holes of the support frame (11) and is in threaded connection with the main nut (14), so that the dial (9) is in contact with the vernier disc (10); the adapter (3) is a cylinder with internal threads at two ends, one end is used for installing and fixing the lower joint of the sensor, the other end is used for installing a detection shaft, and the detection shaft comprises a separately used stretching detection shaft component (4) and a separately used rotation detection shaft (22); the shaft assembly (4) for stretching detection comprises a shaft (20) for stretching detection, a bearing shaft (15), a bidirectional plane thrust bearing (16) and a positioning nut (19), one end of the shaft (20) for stretching detection is fixed with a flange plate on the driving shaft (6), the other end of the shaft is fixed with the bearing shaft (15), the bidirectional plane thrust bearing (16) is sleeved on the bearing shaft (15), the positioning nut (19) with external threads is sleeved on the shaft (20) for stretching detection, the bearing shaft (15) and the bidirectional plane thrust bearing (16) are installed in the adapter (3) and are connected with the internal threads of the adapter (3) through the external threads on the positioning nut (19) to compress the bidirectional plane thrust bearing (16); the rotation detection shaft (22) is a cylinder with an external thread at one end, the external thread at one end of the rotation detection shaft (22) is in threaded connection with the adapter (3), and the other end of the rotation detection shaft is fixed with a flange plate on the driving shaft (6).
2. The experimental device for checking the measurement accuracy of a card-measuring instrument sensor according to claim 1, characterized in that the top ends of the first bracket (1) and the second bracket (24) are provided with hose clamps for fixing the card-measuring instrument sensor.
3. An experimental device for checking the measurement accuracy of a card-measuring instrument sensor according to claim 1, characterized in that after the card-measuring instrument sensor is mounted on the first bracket (1) and the second bracket (24), the central axis of the card-measuring instrument sensor is coaxial with the central holes on the support frame (11) and the vernier disk (10).
4. Experimental device for checking the accuracy of the measurement of a caliper sensor according to claim 1, characterized in that the dial (9) is fixed to the drive shaft (6) by means of a set screw (8).
5. The experimental device for checking the measurement accuracy of a card-measuring instrument sensor according to any one of claims 1 to 4, characterized in that the center angle subtended by two adjacent lines on the dial (9) is 1 ° for a total of 360 scribed lines; the centering angle of two adjacent lines on the vernier dial (10) is 59', and 121 graduation lines are totally arranged; the matching screw threads of the driving shaft (6) and the main nut (14) adopt M30x1 screw threads, the screw pitch is 1mm, and when the vernier dial (10) and the dial (9) rotate relatively by 9 degrees, the displacement of the driving shaft (6) relative to the axial direction of the main nut (14) is 0.025 mm.
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| CN202010892578.8A CN111997587B (en) | 2020-08-31 | 2020-08-31 | Experimental device for detecting measurement accuracy of sensor of card measuring instrument |
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| CN202010892578.8A CN111997587B (en) | 2020-08-31 | 2020-08-31 | Experimental device for detecting measurement accuracy of sensor of card measuring instrument |
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| CN111997587B true CN111997587B (en) | 2021-11-02 |
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| CN203547716U (en) * | 2013-11-22 | 2014-04-16 | 中国石油大学(北京) | Measurement experiment device for drill column clamping point of large-displacement well |
| CN104198303A (en) * | 2014-09-02 | 2014-12-10 | 湖北航天技术研究院总体设计所 | Device for measuring creep of torsion bar |
| CN106706385A (en) * | 2016-12-09 | 2017-05-24 | 航天科工哈尔滨风华有限公司 | Device available for distance scaling and measurement of tensile sample |
| CN106871822A (en) * | 2017-01-13 | 2017-06-20 | 西南交通大学 | The spectrometer and measuring method of a kind of measurable parallel light tube slight rotation angles degree |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7325610B2 (en) * | 2000-04-17 | 2008-02-05 | Weatherford/Lamb, Inc. | Methods and apparatus for handling and drilling with tubulars or casing |
| US20020059736A1 (en) * | 2000-11-22 | 2002-05-23 | Vencill Robert Lee | Method and apparatus for precision axial free end play adjustment of tapered bearings |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2539143Y (en) * | 2002-05-14 | 2003-03-05 | 徐斌 | Vibrating string type strain transducer |
| CN203547716U (en) * | 2013-11-22 | 2014-04-16 | 中国石油大学(北京) | Measurement experiment device for drill column clamping point of large-displacement well |
| CN104198303A (en) * | 2014-09-02 | 2014-12-10 | 湖北航天技术研究院总体设计所 | Device for measuring creep of torsion bar |
| CN106706385A (en) * | 2016-12-09 | 2017-05-24 | 航天科工哈尔滨风华有限公司 | Device available for distance scaling and measurement of tensile sample |
| CN106871822A (en) * | 2017-01-13 | 2017-06-20 | 西南交通大学 | The spectrometer and measuring method of a kind of measurable parallel light tube slight rotation angles degree |
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