CN210321770U - Rotary bar code ruler for calibrating electronic i-angle and sight distance errors of digital level - Google Patents
Rotary bar code ruler for calibrating electronic i-angle and sight distance errors of digital level Download PDFInfo
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- CN210321770U CN210321770U CN201921683612.XU CN201921683612U CN210321770U CN 210321770 U CN210321770 U CN 210321770U CN 201921683612 U CN201921683612 U CN 201921683612U CN 210321770 U CN210321770 U CN 210321770U
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Abstract
The utility model relates to a digital surveyor's level electron i angle and stadia error are examined and determine and are used rotatory bar code chi, be provided with left right adjustment seat on the base, be provided with the front and back adjustment seat on the left and right sides adjustment seat, adjusting device about being provided with on the front and back adjustment seat, be provided with leveling seat from top to bottom on the adjusting device, leveling seat top is provided with the leveling board, leveling board and leveling seat are connected through the leveling bolt, be provided with the drive chamber on the leveling board, the drive chamber upper end is provided with the apron, apron and leveling board parallel arrangement, wear to be equipped with the pivot of vertical setting on the drive chamber, be provided with rotary mechanism in the drive chamber, rotary mechanism drive pivot relatively-driven room rotates, be provided with the chi seat on the apron, the chi seat is through the connection key-type connection with the upper end of pivot, be provided with the chi post perpendicularly on the chi seat. The automatic bar code ruler switching device is simple in structure, convenient to use, small in occupied space and capable of achieving automatic switching of bar code rulers of different manufacturers only by being installed once.
Description
The technical field is as follows:
the utility model belongs to the technical field of digital level examination calibration, concretely relates to digital level electron i angle and stadia error are examined and determine and are used rotatory bar code chi.
Background art:
a digital level gauge, also called an electronic level gauge, is a high-precision elevation measurement device, and consists of a host, a bar code ruler and data processing software. The measuring principle is that a horizontal alignment line can be provided in an eyepiece to read the bar code measuring elevation on a bar code ruler at a corresponding position. The i angle error of the electronic level is the collimation axis error, in the measuring process of the electronic level, when the leveling tube axis of the level is parallel to the collimation axis of the telescope in space, the projection on the vertical plane is parallel, if the two axes are not parallel, the projection on the vertical plane is not parallel, the error is caused when leveling measurement is carried out, and the i angle error is the calibration value which is particularly important when the calibration is carried out.
At present, when an electronic i-angle of a digital level is detected, four outdoor methods are mainly adopted for correction:
(1) the method of the Fosterel method: as shown in fig. 1, two scales (A, B) are set at a distance of 45m, the distance is divided into three equal parts, 2 instrument stations (1, 2) are set on the connecting line, the distance is about 15m from the scales, and then the two scales are measured from the instrument stations, and the i angle calculation formula is as follows:
in the formula
、
、
、
The readings of the two scales (A, B) observed by the digital level at 1 and 2, respectively, S is the distance per equal division, and ρ is a constant often used in the calculation of the measurement, with a value of about 206265, meaning a "second value corresponding to an arc", i.e. an arc of about 206265 seconds.
(2) The nano-Bakel method: as shown in fig. 2, a distance of 45m is measured, the distance is divided into three equal parts, instruments are arranged on the parts (1 and 2), two rulers (A, B) are arranged at the positions one third away from the two ends, the two rulers are measured from a measuring station, and the calculation formula of the i angle is as follows:
in the formula
、
、
、
Are the readings of the two scales (A, B) observed by the digital level at 1, 2 respectively, S being the distance per equal division.
(3) Kukamaoka method: as shown in fig. 3, two scales (A, B) are set up at a distance of about 20m and are read first from station (1) located in the middle of the line between the two scales. Then reading on the two scales from a measuring station (2) at an extension of 20m from the two scales, and calculating the i angle of the two scales by the formula:
in the formula
、
、
、
The readings of the two scales (A, B) observed by the digital level at 1 and 2, respectively, S isThe distance between the two scales (A, B).
(4) The Japanese method: as shown in fig. 4, two scales (A, B) are set up at a distance of about 30m, and are read first from station (1) located in the middle of the line between the two scales. The measuring station (2) is arranged at a position about 3m away from the scale (A), and the calculation formula of the i angle is as follows:
in the formula
、
、
、
The readings of the two scales (A, B) observed by the digital level at 1 and 2, respectively, and S is the distance between the two scales (A, B).
However, in the verification process, instruments of different manufacturers are often encountered, so that bar code rulers of different manufacturers need to be switched to use, and two problems exist: 1. the bar code ruler needs to be replaced, so that the workload is increased, and the time is wasted. 2. The absolute perpendicularity of the rack must be guaranteed when the bar code scale is installed, but the rack cannot be avoided to be perpendicular when the bar code scale is replaced manually, and meanwhile, care must be taken when the bar code scale is repeatedly installed, and the workload is increased.
The sight distance error of the digital level is the sight line distance measuring error of the digital level, two points with the distance of 10m and 30m are selected in a flat place, a ruler column is respectively arranged, after the digital level to be detected is erected, a level II steel tape is used for accurately measuring the horizontal distance D from a plumb sphere point to the ruler column point0And recording, and measuring the horizontal distance from the vertical ball point to the ruler column point by the digital level to be detected for multiple timesSeparating and calculating the tie value DAre all made ofThen, the line-of-sight distance measurement error of the inspected digital level is DAre all made of- D0However, in practice, it is difficult to accurately set the post at exactly 10m and 30m positions, and therefore the horizontal distance D measured with a class II steel tape measure is0The distance is often not an integer, which brings certain trouble to measurement and calculation, and easily causes large measurement error, affecting the accuracy of verification.
The utility model has the following contents:
to sum up, in order to overcome prior art problem not enough, the utility model provides a digit surveyor's level electron i angle and stadia error are examined and determine and are used rotatory bar code chi, it sets up a regular polygon's chi post, and set up can three-dimensionally adjust and the base that can rotate, paste the bar code chi of different producers on each cylinder of chi post, adjust the back through three-dimensional adjusting device during the use, only need rotatory regular polygon's chi post make treat the digit surveyor's that examines and determine correspond with corresponding bar code chi can, moreover, the steam generator is simple in structure, high durability and convenient use, occupation space is little, only need the installation once, just can realize the automatic switch-over to the bar code chi of different producers, time saving and labor saving.
For solving the technical problem, the technical scheme of the utility model is realized like this:
a digital level electron i angle and stadia error examination is with rotatory bar code chi, wherein: comprises a ruler column, a ruler seat, a rotating shaft, a rotating mechanism, a leveling plate, a leveling seat, a base, a left adjusting seat, a right adjusting seat, a front adjusting seat, a rear adjusting seat and an up-down adjusting device, wherein the base is provided with the left adjusting seat and the right adjusting seat, the left adjusting seat and the right adjusting seat are provided with the front adjusting seat and the rear adjusting seat, the front adjusting seat and the rear adjusting seat are provided with the up-down adjusting device, the up-down adjusting device is provided with the leveling seat, the leveling plate is arranged above the leveling seat, the leveling plate is connected with the leveling seat through a leveling bolt, the leveling plate is provided with a driving chamber, the upper end of the driving chamber is provided with a cover plate, the cover plate and the leveling plate are arranged in parallel, the driving chamber is provided with the vertically arranged rotating shaft in a penetrating way, the rotating mechanism is arranged in the driving chamber, the rotating mechanism drives the rotating shaft to rotate relative to the driving, the ruler base is vertically provided with a ruler column, the ruler column is of a regular polygon columnar structure, and a bar code ruler is pasted on each column surface.
Further, rotary mechanism include motor, driving gear and driven gear, the motor fix on the leveling board, the motor is step motor, is provided with the driving gear on the main shaft of motor, driving gear and driven gear intermeshing, driven gear set up in the pivot.
Further, the up-down adjusting device comprises an adjusting shell, a worm wheel, a worm, a screw and a lock cap, the adjusting shell is arranged on the front-back adjusting seat, the worm wheel is arranged in the adjusting shell, a wheel shaft of the worm wheel is connected with the adjusting shell through a bearing and the lock cap, the worm is arranged in the adjusting shell, the worm and the worm wheel are meshed with each other, the wheel shaft of the worm wheel is a hollow wheel shaft, the screw is connected with the inner cavity of the hollow wheel shaft in a threaded manner, the upper end of the screw is connected with the leveling seat through the bearing, and an up-down adjusting handle is arranged at one end of the worm, which is positioned outside the.
Further, the front and rear adjusting seat is of a flat plate structure, the lower end of the front and rear adjusting seat is provided with a front and rear adjusting sliding block arranged along the front and rear direction of the front and rear adjusting sliding block, the left and right sides of the front and rear adjusting sliding block are provided with front and rear adjusting convex blocks, and the upper end of the front and rear adjusting seat is connected with the lower end of an adjusting shell of the vertical adjusting device.
Further, the left and right adjusting seat is of a flat plate structure, a front and rear adjusting sliding groove matched with the front and rear adjusting sliding block is formed in the upper end of the left and right adjusting seat, the left and right adjusting sliding block is arranged at the lower end of the left and right adjusting seat in the left and right direction, supporting frames are arranged on the left and right sides of the left and right adjusting seat, a front and rear adjusting jackscrew is arranged on each supporting frame and corresponds to the front and rear adjusting lug on the front and rear adjusting seat, and a left and right adjusting lug is arranged on the front and rear sides of the left.
Further, the base be dull and stereotyped structure, the upper end of base be provided with control adjustment slider left and right sides adjustment spout of mutually supporting, the base front and back both sides be provided with the adjustment frame, the adjustment frame on be provided with and control the adjustment jackscrew, control the adjustment jackscrew and control the adjustment lug correspondence about on the adjustment seat.
Furthermore, the leveling plate is of a triangular flat plate structure, leveling bolts are arranged at three corners of the triangular flat plate, and leveling bubbles are arranged on the leveling plate.
Further, the connecting key is a spline.
The utility model has the advantages that:
1. the utility model discloses a set up a regular polygon's chi post to the setting can three-dimensionally adjust and the base that can rotate, paste the bar code chi of different producers on each cylinder of chi post, through three-dimensional adjusting device adjustment back during the use, the chi post that only needs rotatory regular polygon make treat the digital spirit level of examination correspond with corresponding bar code chi can, moreover, the steam generator is simple in structure, high durability and convenient use, occupation space is little, only need install once, just can realize the automatic switch-over to the bar code chi of different producers, time saving and labor saving.
2. The utility model discloses an upper and lower adjusting device realizes the rotation of worm through adjusting handle about rotating to make the rotation of worm wheel and shaft, the inner chamber of the shaft of worm wheel passes through the threaded connection screw rod, the rotation of worm wheel, along the inner chamber of the shaft of worm wheel when making the screw rod pivoted reciprocates, the screw rod upper end is connected through the bearing, then the screw rod promotes the leveling seat and reciprocates, can not transmit the rotation of screw rod for the leveling seat simultaneously, realize reciprocating of leveling seat and above-mentioned spare part, realize altitude mixture control.
3. The utility model discloses a fore-and-aft adjustment seat reaches and controls the adjustment seat and all be through mutually supporting of slider and spout, utilizes the jackscrew to realize the front and back and control fine regulation simultaneously, the utility model discloses an upper and lower adjusting device, front and back adjustment seat and control the adjustment seat and realize the utility model discloses a three-dimensional regulation of chi post, the utility model discloses a setting of leveling board can realize the adjustment of levelness, because apron and the parallel arrangement of leveling board, then can realize the assurance of the levelness of apron after the leveling board adjustment level, and the chi seat sets up and is provided with the chi post on apron and chi seat perpendicularly, realizes arranging perpendicularly of chi post to avoid installing repeatedly for the perpendicular of realizing the chi post, reduce examination work load and intensity of labour.
4. The utility model discloses an upper and lower adjusting device, front and back adjustment seat and left and right sides adjustment seat realize the utility model discloses a three-dimensional regulation of chi post is then when carrying out stadia error to the digital level and examining, can lay the back at the chi post, through three-dimensional adjustment, with the accurate adjustment of chi post to 10m and 30m position to the structure is accurate when guaranteeing stadia error examination, reduces simultaneously and measures and calculate the trouble, raises the efficiency.
Description of the drawings:
FIG. 1 is a schematic diagram of a scale and instrument station arrangement for the Fragile method;
FIG. 2 is a schematic diagram of a scale and instrument station arrangement for the Naval method;
FIG. 3 is a schematic diagram of a scale and instrument station arrangement for the Cukamaoka method;
FIG. 4 is a schematic diagram of a scale and instrument station arrangement for the Japanese method;
fig. 5 is a schematic structural view of the present invention;
fig. 6 is a schematic sectional view of the structure of fig. 5 a-a according to the present invention;
fig. 7 is a schematic structural view of the leveling seat and the parts above the leveling seat of the present invention;
fig. 8 is a schematic top view of fig. 7 according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 5, 6, 7 and 8, a rotary bar code ruler for calibrating electronic i-angle and sight distance errors of a digital level comprises a ruler column 1, a ruler base 2, a rotating shaft 3, a rotating mechanism, a leveling plate 4, a leveling base 5, a rotating shaft 3, a base 6, a left-right adjusting base 7, a front-back adjusting base 8 and a vertical adjusting device, wherein the base 6 is of a square flat plate structure, a left-right adjusting sliding groove is arranged at the upper end of the base 6 along the left-right direction of the base, adjusting frames 26 are arranged at the front side and the back side of the base 6, a left-right adjusting jackscrew 27 is arranged on each adjusting frame 26, a left-right adjusting base 7 is arranged on the base 6, the left-right adjusting base 7 is of a square flat plate structure, a left-right adjusting sliding block 22 is arranged at the lower end of the left-right adjusting sliding groove, the left-right adjusting sliding block 22 is, the upper end of the left and right adjusting seat 7 is provided with a front and back adjusting sliding groove arranged along the front and back direction, the left and right sides of the left and right adjusting seat 7 are provided with a supporting frame 23, a front and back adjusting jackscrew 24 is arranged on the supporting frame 23, a left and right adjusting lug 25 is arranged on the front and back sides of the left and right adjusting seat 7, the left and right adjusting lug 25 corresponds to a left and right adjusting jackscrew 27 on the base 6, a front and back adjusting seat 8 is arranged on the left and right adjusting seat 7, the front and back adjusting seat 8 is a square flat plate structure, the lower end of the front and back adjusting slide block is provided with a front and back adjusting slide block 20 arranged along the front and back direction, the left and right sides are provided with a front and back adjusting lug 21, the front-back adjusting lug 21 corresponds to the front-back adjusting jackscrew 24 on the left-right adjusting seat 7, the upper end of the front and rear adjusting seat 8 is connected with the lower end of an adjusting shell 14 of the vertical adjusting device. The up-down adjusting device comprises an adjusting shell 14, a worm wheel 15, a worm 16, a screw 17 and a lock cap 18, wherein the adjusting shell 14 is arranged on a front adjusting seat 8 and a rear adjusting seat 8, the worm wheel 15 is arranged in the adjusting shell 14, a wheel shaft of the worm wheel 15 is connected with the adjusting shell 14 through a bearing and the lock cap 18, the worm 16 is arranged in the adjusting shell 14, the worm 16 is meshed with the worm wheel 15, the wheel shaft of the worm wheel 15 is a hollow wheel shaft, the screw 17 is connected with the inner cavity of the hollow wheel shaft in a threaded manner, the upper end of the screw 17 is connected with the leveling seat 5 through the bearing, and an up-down adjusting handle 19 is arranged at one end of the worm 16, which is. The upper and lower adjusting device is provided with a leveling seat 5, a leveling plate 4 is arranged above the leveling seat 5, the leveling plate 4 is connected with the leveling seat 5 through a leveling bolt 28, the leveling plate 4 is provided with a driving chamber 9, the upper end of the driving chamber 9 is provided with a cover plate 10, the cover plate 10 is arranged in parallel with the leveling plate 4, the driving chamber 9 is provided with a vertically arranged rotating shaft 3 in a penetrating manner, the driving chamber 9 is internally provided with a rotating mechanism, the rotating mechanism drives the rotating shaft 3 to rotate relative to the driving chamber 9, the rotating mechanism comprises a motor 11, a driving gear 12 and a driven gear 13, the motor 11 is fixed on the leveling plate 4, the motor 11 is a stepping motor 11, a driving gear 12 is arranged on a main shaft of the motor 11, the driving gear 12 is mutually meshed with the driven gear 13, and the driven gear 13 is arranged on the rotating shaft 3, the cover plate 10 on be provided with ruler base 2, ruler base 2 pass through the connecting key with the upper end of pivot 3 and be connected, the connecting key is the spline, ruler base 2 on be provided with chi post 1 perpendicularly, chi post 1 be regular hexagon column structure, all paste on its every cylinder and have the bar code chi.
When the utility model is used, when the digital level is tested by the electronic i angle, the utility model is placed at the position of the staff gauge, then the left and right adjusting jackscrew 27 is operated to adjust the left and right positions of the ruler column 1, the front and back adjusting jackscrew 24 is operated to adjust the front and back positions of the ruler column 1, then the upper and lower adjusting handle 19 is operated to rotate the worm 16, the worm 16 drives the worm wheel 15 to rotate, thereby the wheel shaft of the worm wheel 15 rotates, the screw rod 17 drives the screw rod 17 to rotate, the screw rod 17 moves up and down along the inner cavity of the wheel shaft of the worm wheel 15 while rotating, thereby the upper and lower positions of the leveling seat 5 are adjusted, the center of the ruler column 1 is positioned in the visual field of the lens of the digital level through the front and back, left and right and up and down three-dimensional adjustment, then the leveling bolt 28 is operated, the air bubbles in the leveling air bubbles 29 on the leveling plate 4 are positioned at the center position, the level, the cover plate 10 is provided with a ruler base 2, and the ruler columns 1 are vertically arranged on the ruler base 2, so that the vertical arrangement of the ruler columns 1 is guaranteed, and the adjustment preparation before the electronic i-angle verification of the digital level is completed. And operating the digital level to be calibrated to verify the electronic i angle of the digital level.
When the electronic i angle of the digital level of different manufacturers needs to be checked, the motor 11 is started, the motor 11 drives the rotating shaft 3 to rotate through the driving gear 12 and the driven gear 13, and under the action of the connecting key, the rotating shaft 3 drives the ruler base 2 and the ruler column 1 to rotate, so that the bar code ruler corresponding to the digital level to be calibrated is aligned with the digital level. So, only need paste different bar code chi on the cylinder of chi post 1, operating motor 11 can realize, the utility model discloses an installation adjustment can realize examining and determine the electron i angle to the digital level gauge of different producers to effectual improvement examination efficiency, reduce cost.
The utility model discloses when in actual use, can set up zigbee wireless controller on motor 11, realize controlling step motor 11's rotation based on zigbee.
When the stadia error of digital level is examined as required, with two the utility model discloses lay 10m and 30m positions that the distance waited the digital level of examination respectively, then with the help of II grades of steel tape, the operation is done and is controlled the position about adjustment jackscrew 27 adjustment chi post 1, adjust the fore-and-aft position of 24 adjustment chi posts of jackscrews 1 around the operation, wait to examine the 10m and the 30m position of examining the digital level with the accurate adjustment of chi post to the distance, examine and determine the stadia distance measuring error of this digital level according to the examination rule of digital level, at this moment, II grades of steel tape measuring instrument plumb sphere point to the horizon distance D of chi post point0Equal to 10m and 30 m.
It should be noted that the above-mentioned embodiments are illustrative and not restrictive of the technical solutions of the present invention, and equivalents of those skilled in the art or other modifications made according to the prior art are intended to be included within the scope of the claims of the present invention as long as they do not exceed the spirit and scope of the technical solutions of the present invention.
Claims (8)
1. The utility model provides a digital level appearance electron i angle and stadia error are examined and determine and are used rotatory bar code chi which characterized in that: comprises a ruler column (1), a ruler seat (2), a rotating shaft (3), a rotating mechanism, a leveling plate (4), a leveling seat (5), a base (6), a left and right adjusting seat (7), a front and back adjusting seat (8) and an upper and lower adjusting device, wherein the base (6) is provided with the left and right adjusting seat (7), the left and right adjusting seat (7) is provided with the front and back adjusting seat (8), the front and back adjusting seat (8) is provided with the upper and lower adjusting device, the upper and lower adjusting device is provided with the leveling seat (5), the leveling plate (4) is arranged above the leveling seat (5), the leveling plate (4) is connected with the leveling seat (5) through a leveling bolt (28), the leveling plate (4) is provided with a driving chamber (9), the upper end of the driving chamber (9) is provided with a cover plate (10), and the cover plate (10) is arranged in parallel with the leveling plate (4), drive chamber (9) on wear to be equipped with pivot (3) of vertical setting, drive chamber (9) in be provided with rotary mechanism, rotary mechanism drive pivot (3) relative drive chamber (9) rotate, apron (10) on be provided with chi seat (2), the upper end of chi seat (2) and pivot (3) through the key-type connection, chi seat (2) on be provided with chi post (1) perpendicularly, chi post (1) be regular polygon column structure, all paste on its every cylinder and have the bar code chi.
2. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: the rotating mechanism comprises a motor (11), a driving gear (12) and a driven gear (13), the motor (11) is fixed on the leveling plate (4), the motor (11) is a stepping motor (11), the driving gear (12) is arranged on a main shaft of the motor (11), the driving gear (12) is meshed with the driven gear (13), and the driven gear (13) is arranged on the rotating shaft (3).
3. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: the up-down adjusting device comprises an adjusting shell (14), a worm wheel (15), a worm (16), a screw rod (17) and a locking cap (18), wherein the adjusting shell (14) is arranged on a front adjusting seat and a rear adjusting seat (8), the worm wheel (15) is arranged in the adjusting shell (14), a wheel shaft of the worm wheel (15) is connected with the adjusting shell (14) through a bearing and the locking cap (18), the worm (16) is arranged in the adjusting shell (14), the worm (16) is meshed with the worm wheel (15), the wheel shaft of the worm wheel (15) is a hollow wheel shaft, the screw rod (17) is connected with an inner cavity of the hollow wheel shaft in a threaded mode, the upper end of the screw rod (17) is connected with the leveling seat (5) through the bearing, and an up-down adjusting handle (19) is arranged at one end, located outside the adjusting shell (14).
4. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: the front and back adjusting seat (8) is of a flat plate structure, a front and back adjusting sliding block (20) arranged along the front and back direction of the front and back adjusting seat is arranged at the lower end of the front and back adjusting seat, front and back adjusting convex blocks (21) are arranged at the left and right sides of the front and back adjusting seat, and the upper end of the front and back adjusting seat (8) is connected with the lower end of an adjusting shell (14) of the up and down adjusting.
5. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: the left and right adjusting seat (7) is of a flat plate structure, a front and rear adjusting sliding groove matched with the front and rear adjusting sliding block (20) is formed in the upper end of the left and right adjusting seat, a left and right adjusting sliding block (22) is arranged at the lower end of the left and right adjusting seat (7) in the left and right direction, supporting frames (23) are arranged on the left and right sides of the left and right adjusting seat (7), a front and rear adjusting jackscrew (24) is arranged on each supporting frame (23), the front and rear adjusting jackscrew (24) corresponds to the front and rear adjusting lug (21) on the front and rear adjusting seat (8), and left and right adjusting lugs (25) are arranged on the front and.
6. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: base (6) be dull and stereotyped structure, the upper end of base (6) be provided with control adjustment slider (22) left and right sides adjustment spout of mutually supporting about, base (6) around both sides be provided with adjustment frame (26), adjustment frame (26) on be provided with about adjust jackscrew (27), about adjust jackscrew (27) with about adjust about on seat (7) adjust lug (25) correspond.
7. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: the leveling plate (4) is of a triangular flat plate structure, leveling bolts (28) are arranged at three corners of the triangular flat plate, and leveling air bubbles (29) are arranged on the leveling plate (4).
8. The rotary barcode ruler for electronic i-angle and sight distance error verification of a digital level according to claim 1, wherein: the connecting key is a spline.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595510A (en) * | 2019-10-10 | 2019-12-20 | 河南省计量科学研究院 | Rotary bar code ruler for calibrating electronic i-angle and sight distance errors of digital level |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595510A (en) * | 2019-10-10 | 2019-12-20 | 河南省计量科学研究院 | Rotary bar code ruler for calibrating electronic i-angle and sight distance errors of digital level |
| CN110595510B (en) * | 2019-10-10 | 2024-03-15 | 河南省计量测试科学研究院 | Digital level electronic angle and visual range error detecting rotary bar code ruler |
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