CN211426385U - Universal test block for performance test of ocean engineering ultrasonic instrument and probe combination - Google Patents
Universal test block for performance test of ocean engineering ultrasonic instrument and probe combination Download PDFInfo
- Publication number
- CN211426385U CN211426385U CN201921908904.9U CN201921908904U CN211426385U CN 211426385 U CN211426385 U CN 211426385U CN 201921908904 U CN201921908904 U CN 201921908904U CN 211426385 U CN211426385 U CN 211426385U
- Authority
- CN
- China
- Prior art keywords
- test
- hole
- board section
- plate section
- straight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The utility model discloses a general test block of ocean engineering ultrasonic instrument and probe combination capability test, including the test substrate, the test substrate includes straight board section and arc board section, respective lower top surface juncture is equipped with the echelonment recess in straight board section and the arc board section, be equipped with first scale mark on the arc board section along its arcwall face, the junction that closes on straight board section and arc board section is equipped with the test through-hole of multistage echelonment and the third scale mark that uses with the test through-hole cooperation, be equipped with the first test punch combination that the symmetry set up on the last top surface of straight board section and its lower top surface, be equipped with second test punch combination in the straight board section and with the second test punch combination cooperation second scale mark that uses. The utility model discloses a general test block has integrated multiple standard to the different test requirements of instrument and combination probe combination performance, has refined test block function sign, has effectively improved combination capability test's security, agility and portability.
Description
Technical Field
The utility model relates to an ultrasonic wave auxiliary assembly technical field, particularly, in particular to ocean engineering ultrasonic instrument and general test block of probe combination capability test.
Background
The test block is an important apparatus for performance test calibration and detection calibration of an ultrasonic instrument probe system in industrial ultrasonic detection, the ultrasonic detection in the field of ocean engineering at present relates to a plurality of standard specifications (API RP 2X, ASME V, AWS D1.1 and NB/T47013), test blocks (8 blocks) specified by the corresponding standard specifications are required to be prepared when the combined performance of an ultrasonic instrument and a probe is tested, the functions of the test blocks are easy to be confused by a tester when testing, personal injuries such as collision and extrusion and the like are easy to occur due to frequent replacement of the test blocks in the testing process, the use and carrying of different-place engineering projects are inconvenient, and meanwhile, the purchase and maintenance of the standard test blocks with a large number also increase the use cost of enterprises. The existing performance test block for the combination of the ultrasonic detection instrument and the probe has the following defects:
1. the existing ultrasonic detection instrument and probe combination performance test block is required to be carried out on the test block specified by the corresponding standard, a plurality of sets of test blocks are required to be purchased according to the standard specification, the existing ultrasonic detection instrument and probe combination performance test block is only suitable for the specific standard specification, and the universality is poor.
2. The existing performance test blocks for the combination of the ultrasonic detection instrument and the probe are respectively manufactured according to the corresponding standard specification requirements, the number is large, and a tester is easy to generate confusion during measurement, so that test errors are caused, and the correctness of a performance test report for the combination of the ultrasonic detection instrument and the probe is influenced.
3. The performance test of the combination of the existing ultrasonic detection instrument and the probe needs to be carried out on a plurality of test blocks respectively, the test blocks need to be replaced for multiple times in the test process to complete different function tests, collision, extrusion and other personal injuries are easily caused in the test block replacement process, and potential safety hazards exist.
4. The existing performance test of the combination of the ultrasonic detection instrument and the probe relates to a large number of test blocks, is inconvenient to carry for engineering projects operated in different places and is not beneficial to the use of the engineering projects in different places.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. In view of this, the utility model discloses need to provide an integrated multiple standard to the different test requirements of instrument and combination probe combination performance, refine test block function identification, effectively improve the ocean engineering ultrasonic instrument and the general test block of probe combination performance test of security, agility and the portability of combination performance test.
The utility model provides a general test block of ocean engineering ultrasonic instrument and probe combination capability test, including the test substrate, the test substrate includes straight board section and arc board section, straight board section with respective last top surface parallel and level sets up in the arc board section, straight board section with respective lower top surface juncture is equipped with the echelonment recess in the arc board section, be equipped with first scale sign on the arc board section along its arcwall face, close on straight board section with the junction of arc board section be equipped with the test through-hole of multistage echelonment and with the third scale sign that the cooperation of test through-hole used, be equipped with the first test punch combination that the symmetry set up on the last top surface of straight board section and its lower top surface, still be equipped with second test punch combination on the straight board section and with the second scale sign that second test punch combination cooperation was used.
According to the utility model discloses an embodiment, still be equipped with third test punch combination and fourth test punch combination on the straight board section, third test punch combination is located the straight board section is kept away from the upside of arc board section one end, fourth test punch combination is located the outside of third test punch combination.
According to the utility model discloses an embodiment, be equipped with survey hole in the recess, survey the hole with first test hole group mutually perpendicular sets up, and stretches into the inside predetermined depth of straight board section.
According to the utility model discloses an embodiment, be equipped with on the straight section of board and be located fourth test punch combination top and the timing hole in the third test punch combination outside, the timing hole runs through straight section of board, just the diameter in timing hole is 1.5 mm.
According to the utility model discloses an embodiment, first test punch combination is including being located on the top surface and a plurality of test holes on the symmetry that set up and being located on the straight board section a plurality of test holes down that just the symmetry set up on the top surface under the straight board section.
According to the utility model discloses an embodiment, second test punch combination includes left test hole, well test hole and right test hole, a left side test hole well test hole with right side test hole all link up the straight plate section, be equipped with on the second scale sign respectively with a left side test hole well test hole with the scale section that right side test hole matches.
According to the utility model discloses an embodiment, the third test punch combination includes that a plurality of slopes set up and the unanimous five first oblique test holes of diameter, wherein placed in the middle two of first oblique test hole one side first oblique test hole with placed in the middle first oblique test hole is with first length equidistance and spaced apart arranging, two of opposite side first oblique test hole with placed in the middle first oblique test hole is with second length equidistance and spaced apart arranging, and wherein second length is greater than first length.
According to the utility model discloses an embodiment, fourth test punch combination includes that a plurality of slopes set up and four second oblique test holes that the diameter is unanimous, adjacent two the centre-to-centre spacing of second oblique test hole is the same.
According to the utility model discloses an embodiment, the test through-hole link up the straight board section is divided into tertiary stair structure, wherein from the diameter of straight board section leading flank to its trailing flank reduces in proper order, and the diameter is 50mm, 44mm, 40mm and 30mm in proper order.
According to the utility model discloses an embodiment, just keep away from on the last top surface of arc board section the one end of straight board section is equipped with the arch, is close to the one end of straight board section is equipped with the draw-in groove, the draw-in groove is close to one side of arc board section is arrived the distance of bellied lateral surface is 100 mm.
The utility model discloses a general test block of ocean engineering ultrasonic instrument and probe combination capability test, to test instrument and probe combination capability requirement and timing function integration in an organic whole such as probe incidence point and angle in the common standard specification of ocean engineering field ultrasonic testing, when making general test block satisfy multiple combination capability test requirement, each functional test mutual noninterference, the test block occupies smallly, the function integrates, test block function sign refines in detail, allopatric project carries portableization, reduce the tester simultaneously and take place the probability of accidental injury because of frequently changing the test block at the test procedure, the tester of being convenient for accurately accomplishes the test procedure fast, test in the engineering project of being convenient for is used widely, the security of test block combination capability test has effectively been improved, rapidity and portability.
Drawings
Fig. 1 is a front view of a general test block for performance test of a combination of an ocean engineering ultrasonic instrument and a probe according to the utility model.
Fig. 2 is a cross-sectional view of a first test hole group of a general test block for performance test of an ocean engineering ultrasonic instrument and probe combination according to the utility model.
Fig. 3 is a top view of a general test block for performance test of a combination of an ocean engineering ultrasonic instrument and a probe according to the utility model.
Fig. 4 is a schematic cross-sectional structure diagram of a test through hole of a general test block for performance test of an ocean engineering ultrasonic instrument and a probe combination according to the utility model.
Reference numerals: 10-a test substrate; 11-straight plate section; 12-arc plate segment; 13-a groove; 14-first scale mark; 15-testing the through hole; 16-third scale mark; 17-a first set of test holes; 18-a second set of test holes; 19-second scale mark; 20-a third set of test holes; 21-a fourth set of test holes; 22-assay well; 23-an alignment hole; 24-a bump; 25-a card slot; 171-test well; 172-lower test well; 181-left test well; 182-middle test well; 183-Right test well.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1 to 3, a general test block for testing the performance of an ocean engineering ultrasonic instrument and probe combination comprises a test substrate 10, the test substrate 10 comprises a straight plate section 11 and an arc plate section 12, the upper top surfaces of the straight plate section 11 and the arc plate section 12 are arranged in parallel, a step-shaped groove 13 is arranged at the junction of the lower top surfaces of the straight plate section 11 and the arc plate section 12, a first scale mark 14 is arranged on the arc surface of the arc plate section 12, a multi-stage step-shaped test through hole 15 and a third scale mark 16 matched with the test through hole 15 are arranged near the junction of the straight plate section 11 and the arc plate section 12, a first test hole group 17 symmetrically arranged is arranged on the upper top surface and the lower top surface of the straight plate section 11, a second test hole group 18 and a second scale mark 19 matched with the second test hole group 18 are arranged on the straight plate section 11, in the actual design, the length of the upper top surface of the test substrate 10 is 360mm, the thickness is 30mm, the length of the straight plate section 11 in the lower bottom surface is 225mm, and the radian of the arc plate section 12 is 100 mm.
The utility model discloses a general test block of ocean engineering ultrasonic instrument and probe combination capability test, to test instrument and probe combination capability requirement and timing function integration in an organic whole such as probe incidence point and angle in the common standard specification of ocean engineering field ultrasonic testing, when making general test block satisfy multiple combination capability test requirement, each functional test mutual noninterference, the test block occupies smallly, the function integrates, test block function sign refines in detail, allopatric project carries portableization, reduce the tester simultaneously and take place the probability of accidental injury because of frequently changing the test block at the test procedure, the tester of being convenient for accurately accomplishes the test procedure fast, test in the engineering project of being convenient for is used widely, the security of test block combination capability test has effectively been improved, rapidity and portability.
As shown in fig. 1 and 3, the straight plate segment 11 is further provided with a third test hole group 20 and a fourth test hole group 21, the third test hole group 20 is located on the upper side of the end of the straight plate segment 11 away from the arc plate segment 12, and the fourth test hole group 21 is located on the outer side of the third test hole group 20.
As shown in fig. 1 and 3, the groove 13 is provided with a measuring hole 22, the measuring hole 22 is arranged perpendicular to the first testing hole group 17 and extends into the straight plate section 11 to a predetermined depth, it is understood that the measuring hole 22 is a hole required for the sensitivity measurement of a straight probe in the standard specification of NB/T47013.10-2015 for nondestructive testing of pressure-bearing equipment, the diameter of the testing hole is 2mm, and the hole depth is 200 mm.
As shown in fig. 1, the straight plate segment 11 is provided with an adjusting hole 23 located above the fourth test hole group 21 and outside the third test hole group 20, the adjusting hole 23 penetrates through the straight plate segment 11, and the diameter of the adjusting hole 23 is 1.5mm, it should be understood that the adjusting hole 23 is used for adjusting the detection reference sensitivity in the steel structure welding specification AWS D1.1/D1.1M standard specification.
As shown in fig. 1 to 3, the first test hole group 17 includes a plurality of upper test holes 171 symmetrically disposed on the upper top surface of the straight plate section 11 and a plurality of lower test holes 172 symmetrically disposed on the lower top surface of the straight plate section 11, wherein the upper test holes 171 are symmetrically disposed in two sets, each set includes one deep and one shallow upper test hole 171, the lower test holes 172 are symmetrically disposed in two sets, and also includes one deep and one shallow lower test hole 172, the plurality of holes in the upper test holes 171 and the plurality of holes in the lower test holes 172 are disposed in a staggered manner, wherein the deep upper test holes 171 and the deep lower test holes 172 are disposed near the center line of the test substrate 10 in the up-down direction, it is understood that the deeper holes of the upper test holes 171 and the lower test holes 172 are 40mm deep, the shallower holes are 30mm deep, the first test hole group 17 is a pressure-bearing device for detecting the TOFD initial scanning height in the specification of the nondestructive NB/T47013.10-TOFD test, the diameters of the upper test hole 171 and the lower test hole 172 in the first test hole group 17 are 2mm, the aperture error is not more than +/-0.02 mm, the perpendicularity deviation of the opening is not more than +/-0.1 mm, and other dimensional errors are not more than +/-0.05 mm.
As shown in fig. 1, the second test hole group 18 includes a left test hole 181, a middle test hole 182, and a right test hole 183, the left test hole 181, the middle test hole 182, and the right test hole 183 all pass through the straight plate section 11, and the second scale mark 19 is provided with scale sections matching with the left test hole 181, the middle test hole 182, and the right test hole 183, respectively, wherein the second test hole group 18 is a steel structure welding specification AWS D1.1/D1.1M standard specification for measuring the probe resolution, the left test hole 181, the middle test hole 182, and the right test hole 183 all have three holes and have a hole diameter of 1.59mm, and the second scale mark 19 is located at the lower end side of the straight plate section 11, and the left test hole 181 matches with the second scale mark 19 at 60 °, the middle test hole 182 matches with the second scale mark 19 at 45 °, and the right test hole 183 matches with the second scale mark 19 at 70 °.
As shown in fig. 1, the third testing hole group 20 includes a plurality of five first oblique testing holes with the same diameter and arranged obliquely, the diameter of the first oblique testing hole is 1.5mm, the hole depth is 22mm, wherein two first oblique testing holes on one side of the centered first oblique testing hole and the centered first oblique testing hole are arranged at equal intervals and with a first length, and two first oblique testing holes on the other side and the centered first oblique testing hole and the centered second oblique testing hole are arranged at equal intervals and with a second length, wherein the first length is L1, the second length is L2, and the second length is greater than the first length, i.e., L2 > L1, so as to satisfy the determination of the probe resolution in the API-RP-2X standard specification recommended for marine structure manufacturing.
As shown in FIG. 1, the fourth test hole group 21 includes a plurality of four second oblique test holes which are obliquely arranged and have consistent diameters, the center distance between two adjacent second oblique test holes is the same, and the aperture of each second oblique test hole is 2mm, so that the measurement of the straight probe blind area in the standard specification of pressure-bearing equipment nondestructive testing NB/T47013.10-2015 is met.
As shown in fig. 1 and 3, the test through hole 15 penetrates the straight plate section 11 and is divided into a three-step structure in which the diameter decreases from the front side surface to the rear side surface of the straight plate section 11 in order and the diameter is 50mm, 44mm, 40mm and 30mm in order, the third scale mark 16 includes a 55-75 ° scale section located at the upper end side of the straight plate section 11 and a 40-50 ° scale section located at the lower end side of the straight plate section 11, wherein the test through hole 15 is used for measuring the angle refraction angle of the probe and also for measuring the horizontal linearity and the vertical linearity, in an actual test substrate, each scale value of the third scale mark 16 represents 1 degree, it should be understood that, when the probe angle is tested, the probe faces a circle with a diameter of 30mm in the test through hole 15, the position of each angle is calculated according to the pythagorean theorem,
as shown in FIG. 4, the test through hole 15 is provided with a test organic glass at a hollow position on the back side of the test substrate 10, and is used for the measurement of the horizontal linearity of the test straight probe in the NB/T47013.10-2015 standard specification.
As shown in fig. 1 and 3, a protrusion 24 is disposed on an upper top surface of the arc plate section 12 and an end far from the straight plate section 11, a slot 25 is disposed on an end of the arc plate section 12 near the straight plate section 11, wherein the slot 25 is two slots oppositely disposed on a front and rear plane of the test substrate 10, a distance from a side of the slot 25 near the arc plate section 12 to an outer side surface of the protrusion 24 is 100mm, a diameter R of the arc plate section 12 is 100mm, an arc angle range of the first scale mark 14 is 0 ° to 90 °, each scale represents 1 °, and the slot is used for determining a 12dB sound beam spread angle, a probe incident angle, and a tilt probe sensitivity margin in a pressure-bearing apparatus nondestructive testing standard specification of-T47013.10-NB, wherein a laser mark line is disposed on the top surface of the arc plate section 12 along a transverse extending direction of the test substrate 10, the laser mark line is used for placing a TOFD probe at a center of an R100 arc, ensuring that the extended line of the center line of the TOFD probe coincides with the extended line.
The measurement processes and measurement technical requirements of the above various standard specifications are all the prior art, and are not described herein again.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. The utility model provides a general test block of ocean engineering ultrasonic instrument and probe combination capability test, includes the test base plate, the test base plate includes straight board section and arc board section, straight board section with respective last top surface parallel and level sets up in the arc board section, straight board section with respective lower top surface juncture is equipped with the echelonment recess in the arc board section, its characterized in that, be equipped with first scale sign on the arc board section along its arcwall face, close on straight board section with the junction of arc board section be equipped with the test through-hole of multistage echelonment and with the third scale sign that the cooperation of test through-hole used, be equipped with the first test hole group that the symmetry set up on the last top surface of straight board section and its lower top surface, still be equipped with on the straight board section the second test hole group and with the second scale sign that the cooperation of second test hole group was used.
2. The universal test block for combined performance testing of ocean engineering ultrasonic instrument and probe according to claim 1, wherein the straight plate section is further provided with a third test hole group and a fourth test hole group, the third test hole group is located at an upper side of one end of the straight plate section far away from the arc plate section, and the fourth test hole group is located at an outer side of the third test hole group.
3. The universal test block for testing the performance of the combination of an ultrasonic instrument and a probe in ocean engineering according to claim 1, wherein the groove is provided with a measuring hole, and the measuring hole and the first measuring hole group are arranged perpendicular to each other and extend into the straight plate section to a preset depth.
4. The universal test block for combined performance testing of ocean engineering ultrasonic instrument and probe according to claim 2, wherein the straight plate section is provided with tuning holes located above the fourth test hole group and outside the third test hole group, the tuning holes penetrate through the straight plate section, and the diameter of the tuning holes is 1.5 mm.
5. The universal test block for combined performance testing of ocean engineering ultrasonic instrument and probe according to claim 1, wherein said first test hole set comprises a plurality of upper test holes symmetrically disposed on the upper top surface of said straight plate section and a plurality of lower test holes symmetrically disposed on the lower top surface of said straight plate section.
6. The universal test block for combined performance testing of ocean engineering ultrasonic instrument and probe according to claim 1, wherein the second test hole group comprises a left test hole, a middle test hole and a right test hole, the left test hole, the middle test hole and the right test hole all penetrate through the straight plate section, and the second scale mark is respectively provided with scale sections matched with the left test hole, the middle test hole and the right test hole.
7. The universal test block for combined performance testing of ocean engineering ultrasonic instruments and probes according to claim 2, wherein the third test hole group comprises a plurality of five first oblique test holes with consistent diameters and arranged obliquely, wherein two of the first oblique test holes on one side of the centered first oblique test hole are arranged with the centered first oblique test hole at equal intervals with a first length, and two of the first oblique test holes on the other side are arranged with the centered first oblique test hole at equal intervals with a second length, wherein the second length is greater than the first length.
8. The universal test block for combined performance testing of ocean engineering ultrasonic instrument and probe according to claim 2, wherein the fourth test hole group comprises a plurality of four second oblique test holes which are obliquely arranged and have consistent diameters, and the center distances between two adjacent second oblique test holes are the same.
9. The universal test block for testing the combined performance of the ocean engineering ultrasonic instrument and the probe according to claim 1, wherein the test through hole penetrates through the straight plate section and is divided into a three-stage step structure, wherein the diameters of the test through hole from the front side surface to the rear side surface of the straight plate section are sequentially reduced, and the diameters are sequentially 50mm, 44mm, 40mm and 30 mm.
10. The universal test block for testing the combined performance of an ocean engineering ultrasonic instrument and a probe according to claim 1, wherein a protrusion is arranged on one end of the upper top surface of the arc plate section, which is far away from the straight plate section, a clamping groove is arranged on one end of the arc plate section, which is close to the straight plate section, and the distance from one side of the clamping groove, which is close to the arc plate section, to the outer side surface of the protrusion is 100 mm.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201921908904.9U CN211426385U (en) | 2019-11-06 | 2019-11-06 | Universal test block for performance test of ocean engineering ultrasonic instrument and probe combination |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201921908904.9U CN211426385U (en) | 2019-11-06 | 2019-11-06 | Universal test block for performance test of ocean engineering ultrasonic instrument and probe combination |
Publications (1)
Publication Number | Publication Date |
---|---|
CN211426385U true CN211426385U (en) | 2020-09-04 |
Family
ID=72285648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201921908904.9U Active CN211426385U (en) | 2019-11-06 | 2019-11-06 | Universal test block for performance test of ocean engineering ultrasonic instrument and probe combination |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN211426385U (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112763583A (en) * | 2021-04-07 | 2021-05-07 | 成都飞机工业(集团)有限责任公司 | Calibration block for ultrasonic phased array sector scanning and manufacturing and using methods |
-
2019
- 2019-11-06 CN CN201921908904.9U patent/CN211426385U/en active Active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112763583A (en) * | 2021-04-07 | 2021-05-07 | 成都飞机工业(集团)有限责任公司 | Calibration block for ultrasonic phased array sector scanning and manufacturing and using methods |
CN112763583B (en) * | 2021-04-07 | 2021-08-03 | 成都飞机工业(集团)有限责任公司 | Calibration block for ultrasonic phased array sector scanning and manufacturing and using methods |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103954695B (en) | A kind of heel test block | |
WO2010063545A8 (en) | Position determination method and geodetic measuring system | |
CN205120670U (en) | A special reference block that is used for path pipe welding seam supersound to climb wave inspection | |
CN101094588A (en) | Test clamps | |
CN211426385U (en) | Universal test block for performance test of ocean engineering ultrasonic instrument and probe combination | |
CN106645433B (en) | Three-dimensional calibration test block for ultrasonic automatic detection system | |
CN113607823A (en) | Method for detecting depth of longitudinal crack of cylindrical concrete by utilizing ultrasonic waves | |
CN211402257U (en) | Steel rail contrast test block for ultrasonic flaw detection of various groove-shaped steel rails | |
CN110425989B (en) | Rapid positioning device and method for detecting point of floor slab thickness gauge | |
CN107941923B (en) | Phased array ultrasonic detection capability verification test block group and use method thereof | |
CN110763768A (en) | Bird-shaped test block | |
CN209764036U (en) | Guiding rule tool for supervision based on laser technology | |
CN202149740U (en) | Tool for measuring R arc shape of section bar | |
CN204240922U (en) | Check tool for spacing between stop blocks | |
CN212780653U (en) | Combined test block for probe wheel calibration and static test | |
CN211122697U (en) | Multifunctional bird-shaped test block | |
CN108548508A (en) | A kind of non-accurate detection method of breakage of thickness of concrete floor | |
CN101726543A (en) | Wave guide rod for acoustic emission testing | |
CN106959449B (en) | High-speed roller machine repetitive positioning accuracy detection method | |
CN213238811U (en) | Detector for automatically and rapidly detecting flatness | |
CN211954057U (en) | Straightness laser detection device | |
KR200413891Y1 (en) | bridge bearing having horizontal gauge | |
CN216900381U (en) | Ultrasonic rebound leveling method measuring area drawing instrument | |
CN106907979A (en) | taper hole diameter measuring tool | |
CN112977751A (en) | Jointed board marking method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
GR01 | Patent grant | ||
GR01 | Patent grant |