CN220398567U - One-well orientation measurement device based on laser height measurement - Google Patents

One-well orientation measurement device based on laser height measurement Download PDF

Info

Publication number
CN220398567U
CN220398567U CN202321834013.XU CN202321834013U CN220398567U CN 220398567 U CN220398567 U CN 220398567U CN 202321834013 U CN202321834013 U CN 202321834013U CN 220398567 U CN220398567 U CN 220398567U
Authority
CN
China
Prior art keywords
laser
movable plate
protecting sheathing
plate bodies
mounting panel
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
Application number
CN202321834013.XU
Other languages
Chinese (zh)
Inventor
陈真
王浩
孙愿平
姚培军
赵术强
陈磊
刘洪臣
姜泉
徐代胜
胡寅银
樊鹏昊
张良
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Ordnance Industry Survey And Geotechnical Institute Co ltd
Original Assignee
China Ordnance Industry Survey And Geotechnical Institute Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Ordnance Industry Survey And Geotechnical Institute Co ltd filed Critical China Ordnance Industry Survey And Geotechnical Institute Co ltd
Priority to CN202321834013.XU priority Critical patent/CN220398567U/en
Application granted granted Critical
Publication of CN220398567U publication Critical patent/CN220398567U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A90/00Technologies having an indirect contribution to adaptation to climate change
    • Y02A90/30Assessment of water resources

Abstract

The application relates to a directional measuring device of a well based on laser height finding relates to shaft measurement technical field, and it is including setting up two laser measuring device and locating the epaxial level circle bubble of mounting panel of level connection on the mounting panel at the mounting panel, laser measuring device includes protecting sheathing, metal button, laser emitter, emission button and display screen, the metal button is located protecting sheathing's top, laser emitter with the metal button is coaxial to be located protecting sheathing's bottom, the logical groove has been seted up on the mounting panel, laser emitter's transmitting end passes logical inslot orientation well perpendicularly, emission button locates on protecting sheathing's the outer wall, the display screen is located protecting sheathing's top this application has the effect of measuring accurate height, simple operation.

Description

One-well orientation measurement device based on laser height measurement
Technical Field
The application relates to the technical field of vertical shaft measurement, in particular to a one-well orientation measurement device based on laser height measurement.
Background
A well orientation measurement is a well orientation measurement method performed in a well, and is commonly used in connection with measurement work. The link measurement is to transmit the plane coordinate system and the elevation system of the ground to the underground so that the ground and the underground can adopt the same coordinate reference and elevation reference to perform the measurement.
The well orientation measurement mainly adopts two hammer lines suspended in a vertical shaft, and the coordinate azimuth angle of the ground point and the coordinate azimuth angle of the ground side are transmitted to the underground through the two hammer lines. The specific operation steps are that the coordinates of two hanging vertical lines and the coordinate azimuth angles of connecting lines are measured by well head projection points and control points on the ground, and then the coordinates of the underground lead starting points and the coordinate azimuth angles of the starting edges are determined underground according to the coordinates of the hanging vertical projection points and the coordinate azimuth angles of the connecting lines.
With respect to the related art in the above, there are the following drawbacks: by using two suspended vertical lines, the artificial operation error is easy to generate, the measurement accuracy is reduced, and the measurement accuracy needs to be further improved.
Disclosure of Invention
In order to improve the mode of adopting two perpendicular lines of hanging to carry out the connection measurement work, easily produce the problem of manual operation error, the application provides a directional measuring device of well based on laser height measurement.
The application provides a directional measuring device of a well based on laser height finding adopts following technical scheme:
the utility model provides a directional measuring device of a well based on laser height finding, includes two laser measuring device and locates the air bubble of level circle on the mounting panel of mounting panel and horizontal connection at the well head, laser measuring device includes protecting sheathing, metal button head, laser emitter, emission button and display screen, the metal button head is located protecting sheathing's top, laser emitter with the metal button head is coaxial to be located protecting sheathing's bottom, the logical groove has been seted up on the mounting panel, laser emitter's transmitting end passes logical groove is perpendicular towards in the well, emission button locates on protecting sheathing's the outer wall, the display screen is located protecting sheathing's top.
Through adopting above-mentioned technical scheme, mounting panel and laser measuring device and the level circle bubble of setting, judge the levelness through the level circle bubble for mounting panel and laser measuring device horizontal installation are in well head department, after laser transmitter sends out laser signal, can be with the plane coordinate and the high transfer of two laser measuring devices on the ground to in the pit, and read the measurement value through the display screen, thereby realize the contact measurement work, the operation is very convenient, and measurement accuracy is high.
Optionally, round holes are formed in two ends of the mounting plate, and the round holes are used for being connected with self-tapping screws.
Through adopting above-mentioned technical scheme, can be convenient fix the mounting panel at the well head through self-tapping screw through the round hole that sets up, it is very convenient.
Optionally, the mounting panel is located the top of logical groove has still seted up the track, the protecting sheathing joint in the track, just the track both sides all symmetry are equipped with the screw hole, pass the screw hole with protecting sheathing threaded connection has the fastening screw.
Through adopting above-mentioned technical scheme, fix two laser measuring device through fastening screw and screw hole and protecting sheathing's threaded connection's mode, effectively realize the installation to laser measuring device.
Optionally, the mounting panel includes two fly leaf bodies, two the axis of fly leaf body is unanimous, and two be equipped with the regulating part between the fly leaf body, the regulating part is used for adjusting two distance between the fly leaf body, two laser measuring device sliding connection respectively in two on the fly leaf body, and two all be equipped with on the fly leaf body and be used for fixing laser measuring device's mounting.
Through adopting above-mentioned technical scheme, two fly leaf bodies and regulating part and the mounting that set up, through the distance between two fly leaf bodies of regulating part adjustment for the use length of mounting panel is adjustable, thereby the well head of effective adaptation equidimension uses, and after adjusting the distance between two fly leaf bodies, corresponds the mounted position of two laser measuring device of also adjusting, and is fixed through the mounting, easy operation, the structure is reliable.
Optionally, the regulating part includes the slide bar, two the spout with the slide bar adaptation has all been seted up to the opposite one side of fly leaf body, the both ends of slide bar respectively sliding connection in two in the spout, two all be equipped with the locking piece on the fly leaf body, the locking piece is used for with the fly leaf body is locked on the slide bar.
Through adopting above-mentioned technical scheme, slide bar and spout and the locking piece that set up are through two fly leaf bodies of following the slide bar slip to effectively realize using length adjustment to the mounting panel, and the locking piece locks the fly leaf body after the distance of two fly leaf bodies is adjusted, ensures that the structure is firm, reliable.
Optionally, the locking piece includes locking bolt, two all offer the screw hole on the fly leaf body, locking bolt passes the screw hole with the slide bar butt.
Through adopting above-mentioned technical scheme, through locking bolt and the screw hole that sets up, after two fly leaf body positions slip are adjusted, be connected locking bolt and screw hole, locking bolt and slide bar butt effectively realize the fixed to the fly leaf body, simple structure, reliable.
Optionally, the mounting includes set screw, two be located on the fly leaf body the adjustment tank has been seted up at the top of logical groove, a plurality of adjusting screw holes have been seted up to the bilateral symmetry of adjustment tank, set screw hole has been seted up on the lateral wall of protective housing, set screw pass arbitrary adjusting screw hole with the fixed screw hole is connected.
Through adopting above-mentioned technical scheme, through set screw and adjusting screw hole and the fixed screw hole that sets up, after adjusting the mounted position sliding of two laser measuring device, set screw passes corresponding adjusting screw hole and fixed screw hole threaded connection to effectively realize the installation fixed to laser measuring device.
Optionally, the distance from the end of the sliding rod to the chute notch is always greater than the distance from the threaded hole to the chute notch.
Through adopting above-mentioned technical scheme, through the restriction of slide bar and screw hole to the distance of spout notch respectively, effectively reduce the movable plate body and appear follow the condition of slide bar whereabouts, the structure is reliable.
In summary, the application includes the following beneficial technical effects of at least one well orientation measurement device based on laser altimetry:
1. the laser measuring device is arranged on the well mouth, and is used for detecting and adjusting levelness through the level bubble, so that the laser measuring device vertically emits signals, and the plane coordinates and the elevation on the ground are transmitted to the underground to finish the linkage measurement work;
2. through the round hole that sets up, can conveniently adopt self-tapping screw to fix the mounting panel at the well head, simple structure, reliable.
Drawings
FIG. 1 is a schematic overall view of example 1 of the present application;
FIG. 2 is an enlarged schematic view of portion A of FIG. 1;
fig. 3 is a schematic overall view of embodiment 2 of the present application.
Reference numerals: 1. a wellhead; 2. a mounting plate; 20. a through groove; 21. a track; 210. fastening a screw; 3. a laser measuring device; 30. a protective housing; 31. a metal button head; 310. cross wires; 32. a laser emitter; 33. a transmit button; 34. a display screen; 4. leveling round bubbles; 5. a round hole; 6. a movable plate body; 60. an adjustment tank; 600. adjusting the screw hole; 7. a slide bar; 70. a chute; 8. a locking bolt; 9. and (5) fixing the screw.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
Example 1:
the embodiment of the application discloses directional measuring device of a well based on laser height measurement, refer to fig. 1 and 2, apply the device in the aspect of mine vertical link up, adopt the measurement mode that transmits ground plane coordinate system and elevation system to the pit to ensure underground works and construct according to the design drawing accuracy, specifically including erect the mounting panel 2 at well head 1 and two laser measuring device 3 on the mounting panel 2 of horizontal connection and locate the water level bubble 4 on the mounting panel 2. In this embodiment, a leveling layer is formed at the wellhead 1, after the mounting plate 2 is erected at the wellhead 1, the levelness of the mounting plate 2 needs to be adjusted by observing the leveling bubble 4 until the leveling bubble is centered, and then the mounting plate 2 is fixed.
Referring to fig. 2, in this embodiment, the laser measuring device 3 is configured to measure the elevation from the surface to the underground by means of laser detection on the mounting plate 2, and includes a protective housing 30, a metal round head 31, a laser emitter 32, an emitting button 33 and a display screen 34, wherein the protective housing 30 is made of an aluminum alloy material, and has a length of 40mm, a width of 35mm, a height of 3mm and a wall thickness of 3mm; the metal round head 31 is arranged at the top of the protective shell 30, and a cross wire 310 is arranged at the center of the part of the metal round head 31 protruding out of the protective shell 30; the laser transmitter 32 is directly connected to the bottom of the protective casing 30, and the starting point of the laser transmitter 32 is positioned in the protective casing 30 and coaxial with the metal round head 31; further mounting a firing button 33 on the outer wall of the protective housing 30 and in information communication with the laser transmitter 32 via a controller; finally, the display screen 34 is arranged on the top of the protective housing 30, the display screen 34 is 20mm long and 10mm wide and is in signal connection with the laser emitter 32, and the top surface of the display screen 34 is slightly lower than the top of the protective housing 30. In order to make the laser transmitter 32 correctly transmit signals downhole, the mounting plate 2 is also provided with a through slot 20, the through slot 20 penetrates through the thickness of the mounting plate 2, and when the laser transmitter 32 is mounted on the mounting plate 2, the transmitting end of the laser transmitter 32 vertically faces into the well through the through slot 20.
When the mounting plate 2 is horizontally erected at the wellhead 1, the emitting ends of the two laser measuring devices 3 face the well, the positions of the two laser measuring devices 3 are recorded as an A point and a B point respectively, then the emitting button 33 is started to control the laser emitter 32 to emit signals into the well, the underground projection points are recorded as an A 'point and a B' point, and the A 'point and the B' point are marked by respectively describing a cross or driving a cross wire 310 iron nail of a circular head to mark. The signal value from the laser transmitter 32 is read on the display screen, and the value is the elevation from the ground to the underground, and is respectively recorded as Ha and Hb. And finally, acquiring plane coordinates and elevations of the point A and the point B by means of a total station or a GNSS measurement method.
Because the metal dome 31 and the laser emitter 32 are coaxially connected, the plane coordinates of point a' = the plane coordinates of point a; b' point plane coordinates = plane coordinates of point B; elevation of point a = elevation of point a-Ha-the laser start point in the protective housing 30 to the top of the tip of the point a; elevation of point B = elevation of point B-Hb-laser start point to point B dome correction within the protective enclosure 30. Therefore, the two laser transmitters 32 on the mounting plate 2 are mounted on the wellhead 1, the contact measurement work can be quickly realized by adopting a laser measurement mode, the plane coordinates and the elevation on the ground are well transmitted to the underground, the measurement accuracy is high, the condition that errors occur in manual detection is effectively reduced, and the use is reliable.
Referring to fig. 1, in this embodiment, in order to be convenient to install at the wellhead 1, the two ends of the mounting plate 2 are provided with the round holes 5, the diameter of each round hole 5 is preferably 6mm, the wellhead 1 is erected on the mounting plate 2, after the levelness of each round hole is adjusted, the round holes 5 are connected with self-tapping screws by means of tools, so that the mounting plate 2 is effectively fixed, the laser transmitters 32 are enabled to stably transmit signals, and the mounting and dismounting are convenient.
Referring to fig. 2, in this embodiment, in order to further install the laser measuring device 3 on the mounting board 2 conveniently, a track 21 is further provided on the top of the through slot 20 on the mounting board 2, the length direction of the track 21 is consistent with the length direction of the mounting board 2, the protecting housing 30 is clamped in the track 21, then screw holes are symmetrically provided on two sides of the track 21, fastening screws 210 are threaded through the screw holes and the protecting housing 30, and the laser emission can be effectively realized through the connection of the fastening screws 210. When measuring work is carried out at different well heads 1, the mounting plate 2 can be replaced, the length of the mounting plate 2 is generally 1500-2000 mm, the width is 50mm, and the height is 13mm; the preferable length is 500mm, 1800mm, 2000mm, can select at will according to the demand when specifically using, after changing mounting panel 2, also reinstallate laser measuring device 3 on new mounting panel 2 immediately, it is convenient to install and remove.
The implementation principle of the one-well orientation measurement device based on laser altimetry is as follows: when the connection measurement work, through setting up mounting panel 2 and laser measuring device 3 level in well head 1 department, then start laser emitter 32 transmission signal, effectively transmit the planar coordinates and the elevation of two subaerial laser measuring device 3 to the pit, accomplish measurement work fast, measure the precision height, convenient operation.
Example 2:
the embodiment of the application discloses directional measuring device of a well based on laser height finding, with embodiment 1 different in that the structure of mounting panel 2 is different, refer to fig. 3, the mounting panel 2 disclosed in embodiment 2 includes two movable plate bodies 6, and the axis of two movable plate bodies 6 is unanimous, still be equipped with the regulating part between two movable plate bodies 6, the regulating part is used for adjusting the distance between two movable plate bodies 6, two laser measuring device 3 then sliding connection respectively on two movable plate bodies 6, and all be equipped with the mounting that is used for fixed laser measuring device 3 on two movable plate bodies 6. Through the setting of two fly leaf bodies 6 and regulating part, can directly adjust the length of mounting panel 2 for the well head 1 of equidimension not can be adapted to a mounting panel 2 uses, and adjusts laser measuring device 3's position immediately through sliding connection's mode, and the mounting is fixed laser measuring device 3 at last. The mounting plate 2 with different specifications does not need to be repeatedly replaced when in use, and the manufacturing of the mounting plate 2 with different specifications is reduced, so that the practical value is higher and the mounting plate is more convenient.
Referring to fig. 3, in this embodiment, the adjusting member includes a sliding rod 7, a sliding groove 70 adapted to the sliding rod 7 is provided on one side of the two movable plates 6, the sliding groove 70 is provided on two sides of the through groove 20 of the movable plate, two ends of the sliding rod 7 are slidably connected in the sliding grooves 70 of the two movable plates respectively, locking members are further provided on the two movable plates 6, the locking members can lock the movable plates 6 on the sliding rod 7, the locking members include locking bolts 8, threaded holes are provided on the two movable plates 6, the connection positions of the two movable plates 6 on the sliding rod 7 are movably adjusted according to the size of the wellhead 1, after the positions of the two movable plates 6 are determined, the locking bolts 8 are abutted with the sliding rod 7 through the threaded holes, the locking bolts 8 are screwed tightly, and the abutment to the sliding rod 7 is firm.
Referring to fig. 3, in this embodiment, when the distance between the two movable plate bodies 6 is adjusted by sliding, in order to avoid sliding, the distance from the end of the sliding rod 7 to the notch of the sliding groove 70 is always greater than the distance from the threaded hole to the notch of the sliding groove 70, so that the stability of the movable plate body 6 is effectively improved by limiting the size.
Referring to fig. 3, in this embodiment, after the distance between two movable plates 6 is adjusted, the installation positions of two laser measuring devices 3 are also required to be adjusted in a sliding manner, in order to fix the laser measuring devices 3 after the laser measuring devices 3 are adjusted in a sliding manner, the fixing member includes a fixing screw 9, an adjusting slot 60 is formed in the top of the through slot 20 on the two movable plates 6, the length direction of the adjusting slot 60 is consistent with the length direction of the through slot 20, a plurality of adjusting screw holes 600 are symmetrically formed in two sides of the adjusting slot 60, fixing screw holes are formed in the side wall of the protective housing 30, after the positions of the laser measuring devices 3 are determined, the fixing screw 9 is connected with the fixing screw holes through any one of the adjusting screw holes 600, so that the fixing of the laser measuring devices 3 is effectively realized, and the installation is very convenient.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in terms of structure, shape and principle of this application should be covered by the protection scope of this application.

Claims (8)

1. One well orientation measurement device based on laser height measurement, its characterized in that: including setting up mounting panel (2) and the level connection at well head (1) two laser measuring device (3) and locating on mounting panel (2) level circle bubble (4), laser measuring device (3) are including protecting sheathing (30), metal button (31), laser emitter (32), emission button (33) and display screen (34), metal button (31) are located the top of protecting sheathing (30), laser emitter (32) with metal button (31) are coaxial to be located the bottom of protecting sheathing (30), logical groove (20) have been seted up on mounting panel (2), the transmitting end of laser emitter (32) passes logical inslot (20) are oriented vertically in the well, emission button (33) are located on the outer wall of protecting sheathing (30), display screen (34) are located the top of protecting sheathing (30).
2. A laser altimeter-based well orientation measurement apparatus of claim 1 wherein: round holes (5) are formed in two ends of the mounting plate (2), and the round holes (5) are used for being connected with self-tapping screws.
3. A laser altimeter-based well orientation measurement apparatus of claim 1 wherein: the mounting plate (2) is located the top of logical groove (20) still has offered track (21), protective housing (30) joint in track (21), just track (21) both sides all symmetry are equipped with the screw hole, pass the screw hole with protective housing (30) threaded connection has fastening screw (210).
4. A laser altimeter-based well orientation measurement apparatus according to claim 3, wherein: the mounting plate (2) comprises two movable plate bodies (6), the axes of the two movable plate bodies (6) are identical, an adjusting piece is arranged between the movable plate bodies (6), the adjusting piece is used for adjusting the distance between the movable plate bodies (6), the two laser measuring devices (3) are respectively connected onto the two movable plate bodies (6) in a sliding mode, and the two movable plate bodies (6) are respectively provided with a fixing piece used for fixing the laser measuring devices (3).
5. A laser altimeter-based well orientation measurement apparatus of claim 4 wherein: the adjusting piece comprises a sliding rod (7), sliding grooves (70) matched with the sliding rod (7) are formed in one opposite sides of the two movable plate bodies (6), two ends of the sliding rod (7) are respectively connected in the two sliding grooves (70) in a sliding mode, locking pieces are arranged on the two movable plate bodies (6), and the locking pieces are used for locking the movable plate bodies (6) on the sliding rod (7).
6. A laser altimeter-based well orientation measurement apparatus of claim 5 wherein: the locking piece comprises locking bolts (8), threaded holes are formed in the two movable plate bodies (6), and the locking bolts (8) penetrate through the threaded holes to be abutted with the sliding rods (7).
7. A laser altimeter-based well orientation measurement apparatus of claim 4 wherein: the fixing piece comprises fixing screws (9), two adjusting grooves (60) are formed in the tops of the through grooves (20) on the movable plate body (6), a plurality of adjusting screw holes (600) are symmetrically formed in two sides of each adjusting groove (60), fixing screw holes are formed in the side wall of the protective casing (30), and the fixing screws (9) penetrate through any one of the adjusting screw holes (600) to be connected with the fixing screw holes.
8. A device for measuring the orientation of a well based on laser altimetry according to claim 6, characterised in that the distance from the end of the slide bar (7) to the slot of the slide groove (70) is always greater than the distance from the threaded hole to the slot of the slide groove (70).
CN202321834013.XU 2023-07-12 2023-07-12 One-well orientation measurement device based on laser height measurement Active CN220398567U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321834013.XU CN220398567U (en) 2023-07-12 2023-07-12 One-well orientation measurement device based on laser height measurement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321834013.XU CN220398567U (en) 2023-07-12 2023-07-12 One-well orientation measurement device based on laser height measurement

Publications (1)

Publication Number Publication Date
CN220398567U true CN220398567U (en) 2024-01-26

Family

ID=89605361

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202321834013.XU Active CN220398567U (en) 2023-07-12 2023-07-12 One-well orientation measurement device based on laser height measurement

Country Status (1)

Country Link
CN (1) CN220398567U (en)

Similar Documents

Publication Publication Date Title
CN108253946B (en) Multifunctional vertical measurement and connection measurement integrated three-dimensional coordinate transmission device and method
US9255798B2 (en) Survey device
CN105974398B (en) A kind of preceding leveling method of radar laser target calibration
CN101464163B (en) Straightness detecting method for platform normal point used for total station instrument check
CN102322896B (en) Omnibearing measurement device and method for tunnel TSP (Total Suspended Particulate) geometric parameter
US20100212169A1 (en) Reflector Target Tripod for Survey System with Light Emitter and Pivoting Bracket for Enhanced Ground Marking Accuracy
US6966387B2 (en) Universal optical adapter for a three dimensional earthgrading system
CN206740090U (en) One kind is applied to linear pattern canal axes positioning measuring device
CN103292795A (en) A method for accurate measurement by using dual prisms, and a measuring rod
CN220398567U (en) One-well orientation measurement device based on laser height measurement
CN105444676A (en) Measuring probe multi-directional positioning device applicable to online scanning
CN106066163A (en) A kind of piler and the on-line monitoring method of stereo storage rack perpendicularity
CN202216642U (en) Tunnel technical specification (TSP) geometric parameter all-around measuring device
CN210108333U (en) Vault settlement measuring device based on precise laser range finder
CN219034719U (en) Deviation correcting device for pipe curtain jacking construction
CN108278993B (en) Total reflection prism laser ranging total station instrument height measuring system and using method
CN211060834U (en) Template concatenation displacement monitoring devices
CN114689012B (en) Vertical guiding system and guiding method for attitude measurement of vertical heading machine
CN111141236A (en) Flatness measuring device and using method thereof
CN109596093A (en) Measuring device and method for shield transmitting pedestal setting-out
CN206479635U (en) Lane surface displacement meter
CN220153594U (en) Device convenient to prism pole straightness calibration and height volume
CN218822384U (en) Tunnel center line measuring matching device
CN220871762U (en) Center line positioning device
CN212513031U (en) Steel construction location installation detection device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant