CN110657823A - Indoor image type plumb aligner calibrating device - Google Patents
Indoor image type plumb aligner calibrating device Download PDFInfo
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- CN110657823A CN110657823A CN201911107206.3A CN201911107206A CN110657823A CN 110657823 A CN110657823 A CN 110657823A CN 201911107206 A CN201911107206 A CN 201911107206A CN 110657823 A CN110657823 A CN 110657823A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C25/00—Manufacturing, calibrating, cleaning, or repairing instruments or devices referred to in the other groups of this subclass
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Abstract
The invention discloses an indoor image type plummet calibrating device, which comprises an image processing system and a working base, wherein the working base is provided with a working platform, the working platform is provided with a supporting frame, the supporting frame is fixedly provided with a two-dimensional inclined platform for bearing the plummet to be calibrated, a supporting arm which is integrally formed with the base is arranged beside the working platform, the supporting arm is fixedly connected with a collimator tube which is arranged along the vertical direction, the objective end of the collimator tube is downwards aligned with the upward plumb line position sent by the plummet to be calibrated, the collimator tube is provided with a first image shooting device, the first image shooting device is used for shooting images of a reticle of the collimator tube and images on the reticle, and the first image shooting device is in signal connection with the image processing system; therefore, the indoor image type plummet collimator calibration device is convenient to operate and use, high in calibration speed and high in accuracy and meets the standard requirement.
Description
Technical Field
The invention belongs to the technical field of detection and calibration of instrument equipment, and particularly relates to an indoor image type plummet calibrating device.
Background
The vertical collimator is a measuring instrument which takes a gravity line as a reference, utilizes visible light or laser coincident with a sighting axis to generate an upward plumb line and a downward plumb line, and is used for measuring the tiny horizontal deviation relative to the plumb line, positioning the plumb line and measuring the vertical profile of an object. Common plummet devices include optical plummet, optical plummet with laser, laser plummet, and laser auto-plummet. The device is widely applied to the construction of high-rise buildings, high towers and chimneys, the installation of launching traps, frames and large-scale cylindrical mechanical equipment, elevator detection, horizontal displacement measurement of dams, engineering supervision, deformation observation and other occasions, and provides powerful guarantee for national economic construction and military development. In recent years, along with the rapid development of national economy, the demand on a vertical collimator is higher, the accuracy requirement on the vertical collimator is higher, the vertical collimator in the process of delivery and use needs to be calibrated and calibrated, otherwise, the construction engineering can generate huge potential safety hazards by using the vertical collimator which is misaligned or damaged, so that the 2002 national quality supervision, inspection and quarantine bureau provides JJF1081-2002 vertical collimator calibration standards, and the accuracy of the metering performance of the vertical collimator is ensured through calibration, thereby providing a reliable standard for construction.
JJF1081-2002 "vertical collimator calibration Specification" stipulates the technical requirements of parameters such as coaxiality of a vertical axis and a telescope collimation axis, one-measurement-return vertical alignment measurement deviation and the like, explains the calibration method of the technical indexes of the vertical collimator, points out that the standard deviation of one-measurement-return vertical alignment measurement of an optical vertical collimator and an optical vertical collimator with a laser is calibrated according to an indoor method, can be calibrated by adopting a similar theodolite level calibrating device, and the standard deviation of one-measurement-return vertical alignment measurement of the laser vertical collimator is calibrated according to an outdoor method, but has the following problems when the laser vertical collimator is calibrated by adopting an outdoor method: (1) the laser plummet calibration is carried out on a field larger than 40 m outdoors, and environmental factors such as airflow disturbance, air pollution, mechanical vibration and the like have great influence on the stability of laser; (2) the outdoor working condition environment also puts high requirements on the accurate and stable arrangement and erection of the measuring equipment by measuring personnel, and more than two personnel are required to be matched for completion during calibration; (3) calibration data needs a calibrator to manually estimate and read on a rectangular coordinate plate with a large division value.
The invention discloses a digital calibration method and a digital calibration device of a laser plummet based on source imaging, which are disclosed by Chinese patent with the publication number of CN104949689A and named as a digital calibration method and a digital calibration device of the laser plummet based on source imaging.
Disclosure of Invention
Aiming at the problems existing in the current plumbing instrument calibration method and the difficulties in practical operation, the invention aims to provide an indoor image type plumbing instrument calibration device which is convenient to operate and use, high in calibration speed and precision, capable of greatly improving the calibration efficiency of the plumbing instrument, reducing the calibration working intensity, adaptive to the requirement of metering technology development, and high in practical value and wide in market prospect; the technical scheme adopted for achieving the purpose is as follows:
the utility model provides an indoor image formula collimator calibrating device, including image processing system and work base, be equipped with work platform on the work base, be equipped with braced frame on work platform, be fixed with on braced frame and be used for bearing the two-dimensional slope platform of treating the calibration collimator, be equipped with the support arm that sets up with base integrated into one piece by work platform, fixedly connected with along the collimator of vertical direction setting on the support arm, collimator's objective end is aimed at downwards and is treated the ascending plumb line position that the calibration collimator sent, install first image pickup device on collimator, first image pickup device is used for carrying out the image pickup to the formation of image on collimator's reticle and the reticle, first image pickup device and image processing system signal connection.
Preferably, still include light path transmission system, light path transmission system includes red laser target plate, adjustable mirror subassembly, a plurality of reflector subassembly that turns to, and it is perforated to correspond to be equipped with light on two-dimensional slope platform and braced frame, and the light is perforated to be used for passing through the downward plumb line that waits to calibrate the plumb aligner and send, and adjustable mirror subassembly is fixed on the work platform under the light is perforated.
Preferably, a light receiving mechanism is fixed on the working platform or the supporting frame, the light receiving mechanism comprises an adjustable two-dimensional base, a transparent laser target plate and a second image shooting device are fixed on the adjustable two-dimensional base, the second image shooting device is used for shooting images of the transparent laser target plate, and the second image shooting device is in signal connection with the image processing system.
Preferably, the adjustable reflector component comprises a reflector support frame with adjustable height, the reflector support frame is fixed on the working platform right below the light perforation, a reflector support with adjustable inclination is arranged on the reflector support frame, and an adjustable reflector is fixed in the reflector support.
Preferably, turn to speculum subassembly including removing the support column, be equipped with slope guiding mechanism at removing the support column top, slope guiding mechanism is including supporting the base, and it has the backup pad to articulate on supporting the base, is fixed with in the backup pad and turns to the speculum piece, threaded connection has adjusting screw, and wherein adjusting screw passes backup pad and adjusting screw's bottom portion top and leans on supporting the base.
Preferably, the steering mirror assembly comprises a movable support column, a three-dimensional adjusting mechanism is arranged at the top of the movable support column, the inclination adjusting mechanism is fixed on a top working platform of the three-dimensional adjusting mechanism, and the steering mirror is fixed on a support plate of the inclination adjusting mechanism.
Preferably, the three-dimensional adjusting mechanism comprises a scissor type lifting frame, a top plate of the scissor type lifting frame is provided with an X-direction slide rail, the X-direction slide rail is connected with a sliding plate in a sliding manner, and an X-direction lead screw nut transmission mechanism for driving the sliding plate to slide along the X direction is arranged between the bottom of the sliding plate and the top plate; the top of the sliding plate is provided with a Y-direction sliding rail, the Y-direction sliding rail is connected with a top working platform in a sliding manner, and a Y-direction lead screw nut transmission mechanism used for driving the top working platform to slide along the Y-direction is arranged between the bottom of the top working platform and the sliding plate.
Preferably, the adjustable mirror plate size is smaller than the turning mirror plate size.
The invention has the following beneficial effects: according to the invention, the two-dimensional inclined platform, the collimator and the first image shooting device are used in a matched manner, so that rapid indoor automatic calibration of a plumb aligner to be calibrated, such as an upward plumb line, is realized, and the calibration efficiency is improved; meanwhile, the rapid indoor automatic calibration of the plumb aligner to be calibrated such as a down plumb line is realized through the matched use of the two-dimensional inclined platform, the adjustable reflector component, the plurality of steering reflector components and the light ray receiving mechanism.
The data acquisition and processing special software matched with the calibrating device can realize the real-time measurement and display of the light spot center position of the laser image of the laser plummet, the manual movement of the grating displacement device to determine the light spot position is avoided, the calibration data is automatically stored and output by an original record report, the detection table and the calculation method of eight parameters of the plummet are provided, the requirements of JJF1081-2002 plummet calibrating specifications are met, and the device can calibrate the following items: (1) the device comprises a measuring return vertical alignment measuring standard deviation (2), perpendicularity of a tubular level and a vertical shaft (3), coaxiality of the vertical shaft and a telescope collimation shaft (4) of an optical plummet, coaxiality of the vertical shaft and the telescope collimation shaft (5) coaxiality of a laser optical shaft and the telescope collimation shaft (6), and automatic arrangement error of an automatic leveling compensator (7), so that an indoor image type vertical alignment instrument calibrating device which is convenient to operate and use, high in calibrating speed and high in accuracy and meets the standard requirements is realized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the construction of an adjustable mirror assembly;
FIG. 3 is a schematic structural view of a tilt adjustment mechanism;
FIG. 4 is a right side view of FIG. 3;
FIG. 5 is a schematic structural diagram of a three-dimensional adjustment mechanism;
FIG. 6 is a left side view of FIG. 5;
FIG. 7 is a schematic structural view of a two-dimensional tilting platform;
FIG. 8 is a right side view of FIG. 7;
fig. 9 is a top view of fig. 8.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, an indoor image type plummet calibration apparatus, includes an image processing system 13 and a work base 3, a working platform 3.1 is arranged on the working base 3, a supporting frame 5 is arranged on the working platform 3.1, a two-dimensional tilting platform 9 for carrying a plumb aligner 10 to be calibrated is fixed to the support frame 5, a supporting arm 3.2 which is integrally formed with the base 3 is arranged beside the working platform 3.1, a collimator 11 which is arranged along the vertical direction is fixedly connected on the supporting arm 3.2, the objective end of the collimator 11 is downwards aligned with the upward plumb line position emitted by the plumb aligner 10 to be calibrated, the collimator 11 is provided with a first image capturing device 12, the first image capturing device 12 is used for capturing images of the reticle of the collimator 11 and images on the reticle, and the first image capturing device 12 is in signal connection with an image processing system 13.
Further in order to realize calibration to plumb aligner 10 of plumb line type down, still include optical path transmission system, optical path transmission system includes red laser target plate (not shown in the figure), adjustable mirror assembly 4, a plurality of reflector assembly 1 that turns to, and the correspondence is equipped with light perforation 9.16 on two-dimentional inclined platform 9 and braced frame 5, and light perforation 9.16 are used for the downward plumb laser line that sends through waiting to calibrate plumb aligner 10, and adjustable mirror assembly 4 is fixed on work platform 3.1 under light perforation 9.16.
The downward plumb laser line that waits to calibrate plumb appearance 10 and send still need receive and carry out the offset calculation processing after adjustable mirror assembly 4, a plurality of turn to mirror assembly 1 back light path length in proper order, so be fixed with light receiving mechanism on work platform 3.1 or braced frame 5, light receiving mechanism includes adjustable two-dimensional base 6, is fixed with transparent laser target board 7, second image shooting device 8 on adjustable two-dimensional base 6, and wherein second image shooting device 8 is used for carrying out the image shooting to transparent laser target board 7 formation of image, and second image shooting device 8 and image processing system 13 signal connection have certainly also can carry out the manual work and read the offset through the light that red laser target board received the reflection.
As shown in fig. 2, the adjustable mirror assembly 4 includes a mirror support frame 4.1 with adjustable height, the mirror support frame 4.1 is fixed on a working platform 3.1 right below the light perforation hole 9.16, a mirror support 4.2 with adjustable inclination is arranged on the mirror support frame 4.1, and an adjustable mirror 4.3 is fixed in the mirror support 4.2.
As shown in fig. 1, fig. 3 and fig. 4, the steering mirror assembly 1 includes a movable support column 1.2, a tilt adjusting mechanism 1.1 is disposed on a top of the movable support column 1.2, the tilt adjusting mechanism 1.1 includes a support base 1.1.3, a support plate 1.1.2 is hinged on the support base 1.1.3, a steering mirror 1.1.4 is fixed on the support plate 1.1.2, and an adjusting screw 1.1.1 is connected to the support base 1.1.2 through a thread, wherein the adjusting screw 1.1.1 penetrates through the support plate 1.1.2, and a bottom end of the adjusting screw 1.1.1 abuts against the support base 1.1.3, so that the steering mirror 1.1.4 can be driven to tilt and swing in a front-back direction by rotating the adjusting screw 1.1.1.
As shown in fig. 1 and fig. 3 to fig. 6, the steering mirror assembly 1 includes a movable support column 1.3, a three-dimensional adjusting mechanism 2 is disposed on a top of the movable support column 1.3, the tilt adjusting mechanism 1.1 is fixed on a top working platform 2.3 of the three-dimensional adjusting mechanism 2, and the steering mirror 1.1.4 is fixed on a support plate 1.1.2 of the tilt adjusting mechanism 1.1.
The three-dimensional adjusting mechanism 2 comprises a scissor type lifting frame 2.7, an X-direction slide rail 2.4 is arranged on a top plate 2.8 of the scissor type lifting frame 2.7, a sliding plate 2.5 is connected on the X-direction slide rail 2.4 in a sliding manner, and an X-direction lead screw nut transmission mechanism 2.6 for driving the sliding plate 2.5 to slide along the X direction is arranged between the bottom of the sliding plate 2.5 and the top plate 2.8; the top of the sliding plate 2.5 is provided with a Y-direction sliding rail 2.9, the Y-direction sliding rail 2.9 is connected with a top working platform 2.3 in a sliding way, and a Y-direction lead screw nut transmission mechanism 2.2 used for driving the top working platform 2.3 to slide along the Y direction is arranged between the bottom of the top working platform 2.3 and the sliding plate 2.5.
The scissors type lifting frame is characterized in that a scissors support is arranged on a base of the scissors type lifting frame 2.7, the bottom of one branch of the scissors support is hinged to the base of the scissors type lifting frame 2.7, the bottom of the other branch is connected with the base of the scissors type lifting frame 2.7 in a sliding mode, a Z-direction screw nut transmission mechanism 2.1 is arranged at the bottom of a top plate 2.8, a connecting arm used for connecting a screw rod of the Z-direction screw nut transmission mechanism 2.1 is arranged at the bottom of the top plate 2.8, the screw rod of the Z-direction screw nut transmission mechanism 2.1 is connected with the connecting arm in a rotating mode, the top of one branch of the scissors support is connected with the screw rod of the Z-direction screw nut transmission mechanism 2.1 in a threaded mode, and therefore when the screw rod of the Z-direction screw nut transmission.
When light is transmitted, the positions of the adjustable reflector 4.3 and the collimator 10 to be calibrated are relatively fixed, and the problem of receiving light mainly lies in fine adjustment of the inclination angle of the adjustable reflector 4.3, so that the size of the adjustable reflector 4.3 is not greatly required; however, the turning mirror 1.14 needs to move back and forth to adjust the proper optical path during the adjustment of the optical path, so the size of the turning mirror 1.14 is larger than that of the adjustable mirror 4.3.
In this embodiment, the two-dimensional tilting platform 9 may adopt a high-precision two-dimensional inclinometer in the prior art, or may be specially designed, as shown in fig. 7 to 9, a two-dimensional tilting platform 9 is provided, which includes a support base 9.7, an intermediate connection plate 9.8 slightly lifting and rotating in the left-right direction is hinged on the support base 9.7, a top support plate 9.9 slightly lifting and rotating in the front-back direction is hinged on the intermediate connection plate 9.8, and light perforation holes 9.16 are provided at corresponding positions of the centers of the top support plate 9.9, the intermediate connection plate 9.8 and the support base 9.7; a lower connecting plate 9.5 is arranged on a supporting seat 9.7, a middle connecting plate 9.6 is arranged on a middle connecting plate 9.8, a micrometer screw mechanism 9.1 which has the same working principle as a micrometer screw is arranged on the middle connecting plate 9.6, a micro-cylinder of the micrometer screw mechanism 9.1 is rotatably connected with the middle connecting plate 9.6 through a first bearing 9.2, and a micrometer rod 9.4 of the micrometer screw mechanism 9.1 is rotatably connected with the lower connecting plate 9.5 through a second bearing 9.3, so that the micro-cylinder is rotated while the micrometer rod 9.4 pushes the middle connecting plate 9.6 to rotate slightly along the left and right directions to form a standard inclination angle; similarly, another middle connecting plate 9.14 is arranged on the middle connecting plate 9.8, a micrometer screw mechanism 9.10 which has the same working principle as the micrometer screw mechanism is arranged on the top supporting plate 9.9, a micro-cylinder of the micrometer screw mechanism 9.10 is rotatably connected with the top supporting plate 9.9 through a third bearing 9.11, and a micrometer rod 9.13 of the micrometer screw mechanism 9.10 is rotatably connected with the middle connecting plate 9.8 through a fourth bearing 9.12, so that when the micro-cylinder is rotated, the micrometer rod 9.13 rotates and simultaneously pushes the top supporting plate 9.9 to rotate slightly along the front-back direction to form a standard inclination angle; the working principle of the micrometer screw mechanism is the same as that of a micrometer screw, the accuracy can reach 0.01 mm, the inclination angle can reach the second level after conversion, and therefore the precision is high.
When the calibrating device is used, (1) when calibrating a plumb aligner 10 to be calibrated, which emits upward plumb lines and the like, firstly, a top support plate 9.9 of a two-dimensional inclined platform 9 is leveled and zeroed, then the calibrating plumb aligner 10 is placed on the top support plate 9.9, the plumb aligner 10 to be calibrated is leveled and adjusted, the emitted upward plumb lines enter a collimator 11 and are printed on a reticle of the collimator 11, then the two-dimensional inclined platform 9 is adjusted to form a two-dimensional inclined angle with higher accuracy meeting the standard requirement, then the calibrating plumb aligner 10 is adjusted to return, and in the process, a first image pickup device 12 carries out real-time image pickup on images on the reticle, and image information is transmitted to an image processing system 13 for software processing, so that calibration parameters are obtained.
(2) When calibrating a plumb aligner 10 to be calibrated, which emits a downward plumb line and the like, firstly leveling and zeroing a top support plate 9.9 of a two-dimensional inclined platform 9, then placing the calibrating plumb aligner 10 on the top support plate 9.9, leveling and adjusting the plumb aligner 10 to be calibrated, vertically transmitting the downward plumb line vertically downwards, reflecting the downward plumb line by an adjustable reflector component 4, extending a light path by back-and-forth reflection of a plurality of steering reflector components 1, and finally entering a red laser target plate for manually reading variation of deviation amount or entering a transparent laser target plate 7 for carrying out real-time image shooting by an image shooting device 8 to image the transparent laser target plate 7, transmitting image information to an image processing system 13 for software processing, and then adjusting the two-dimensional inclined platform 9 to form a two-dimensional inclination angle with higher accuracy meeting the standard requirement, and (5) carrying out return adjustment on the calibrating plummet 10 so as to obtain calibration parameters.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides an indoor image formula collimator calibrating device, a serial communication port, including image processing system and work base, be equipped with work platform on work base, be equipped with braced frame on work platform, be fixed with the two-dimensional slope platform that is used for bearing the weight of waiting to calibrate the collimator on braced frame, be equipped with the support arm that sets up with base integrated into one piece by work platform, fixedly connected with along the collimator of vertical direction setting on the support arm, collimator's objective end aligns downwards and waits to calibrate the upward plumb line position that the collimator sent, install first image pickup device on collimator, first image pickup device is used for carrying out the image pickup to the reticle of collimator and the formation of image on the reticle, first image pickup device and image processing system signal connection.
2. The indoor video plummet calibration apparatus of claim 1, further comprising a light path transmission system, wherein the light path transmission system comprises a red laser target, an adjustable mirror assembly, and a plurality of steering mirror assemblies, wherein corresponding light perforations are provided on the two-dimensional tilt platform and the support frame for passing a downward plumb line from the plummet to be calibrated, and the adjustable mirror assembly is fixed on the work platform directly below the light perforations.
3. The indoor image type plummet calibrating device according to claim 2, wherein a light receiving mechanism is fixed on the working platform or the supporting frame, the light receiving mechanism comprises an adjustable two-dimensional base, a transparent laser target plate and a second image shooting device are fixed on the adjustable two-dimensional base, the second image shooting device is used for shooting the transparent laser target plate for imaging, and the second image shooting device is in signal connection with the image processing system.
4. The indoor video plummet calibration apparatus of claim 2, wherein the adjustable mirror assembly comprises a height adjustable mirror support secured to the work platform directly below the light perforation, wherein the mirror support has a mirror mount with an adjustable tilt, and wherein the adjustable mirror is secured within the mirror mount.
5. The indoor video plummet calibration apparatus of claim 4, wherein the steering mirror assembly comprises a movable support column, a tilt adjustment mechanism is provided on top of the movable support column, the tilt adjustment mechanism comprises a support base, a support plate is hinged on the support base, a steering mirror is fixed on the support plate, an adjusting screw is connected with the support plate through a thread, wherein the adjusting screw passes through the support plate and the bottom end of the adjusting screw abuts against the support base.
6. The indoor video plummet calibration apparatus of claim 5, wherein the steering mirror assembly comprises a mobile support column with a three-dimensional adjustment mechanism on top of the mobile support column, the tilt adjustment mechanism being secured to a top work platform of the three-dimensional adjustment mechanism, and the steering mirror being secured to a support plate of the tilt adjustment mechanism.
7. The indoor imaging plummet calibration device of claim 6, wherein the three-dimensional adjustment mechanism comprises a scissor-type lifting frame, an X-direction slide rail is arranged on a top plate of the scissor-type lifting frame, a sliding plate is connected on the X-direction slide rail in a sliding manner, and an X-direction lead screw nut transmission mechanism for driving the sliding plate to slide along the X direction is arranged between the bottom of the sliding plate and the top plate; the top of the sliding plate is provided with a Y-direction sliding rail, the Y-direction sliding rail is connected with a top working platform in a sliding manner, and a Y-direction lead screw nut transmission mechanism used for driving the top working platform to slide along the Y-direction is arranged between the bottom of the top working platform and the sliding plate.
8. An indoor image plummet calibration device according to any one of claims 5 to 7, wherein the adjustable mirror plate size is smaller than the turning mirror plate size.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911107206.3A CN110657823A (en) | 2019-11-13 | 2019-11-13 | Indoor image type plumb aligner calibrating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911107206.3A CN110657823A (en) | 2019-11-13 | 2019-11-13 | Indoor image type plumb aligner calibrating device |
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| CN201911107206.3A Pending CN110657823A (en) | 2019-11-13 | 2019-11-13 | Indoor image type plumb aligner calibrating device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112082577A (en) * | 2020-09-25 | 2020-12-15 | 开封市质量技术监督检验测试中心 | Leveling instrument telescope focusing running error calibrating installation |
| CN114858042A (en) * | 2022-04-12 | 2022-08-05 | 西安热工研究院有限公司 | Automatic device and method for checking accuracy of plumb line system |
-
2019
- 2019-11-13 CN CN201911107206.3A patent/CN110657823A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112082577A (en) * | 2020-09-25 | 2020-12-15 | 开封市质量技术监督检验测试中心 | Leveling instrument telescope focusing running error calibrating installation |
| CN112082577B (en) * | 2020-09-25 | 2024-02-13 | 开封市质量技术监督检验测试中心 | Level telescope focusing operation error calibrating device |
| CN114858042A (en) * | 2022-04-12 | 2022-08-05 | 西安热工研究院有限公司 | Automatic device and method for checking accuracy of plumb line system |
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