CN107389021B - Building wall perpendicularity detection device - Google Patents

Building wall perpendicularity detection device Download PDF

Info

Publication number
CN107389021B
CN107389021B CN201710769006.9A CN201710769006A CN107389021B CN 107389021 B CN107389021 B CN 107389021B CN 201710769006 A CN201710769006 A CN 201710769006A CN 107389021 B CN107389021 B CN 107389021B
Authority
CN
China
Prior art keywords
eccentric wheel
driving
driving shaft
horizontal base
wheel
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
CN201710769006.9A
Other languages
Chinese (zh)
Other versions
CN107389021A (en
Inventor
钱国东
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.)
Wuxi Houfa Automation Equipment Co ltd
Original Assignee
Wuxi Houfa Automation Equipment 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 Wuxi Houfa Automation Equipment Co ltd filed Critical Wuxi Houfa Automation Equipment Co ltd
Priority to CN201710769006.9A priority Critical patent/CN107389021B/en
Publication of CN107389021A publication Critical patent/CN107389021A/en
Application granted granted Critical
Publication of CN107389021B publication Critical patent/CN107389021B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/22Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01CMEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C15/00Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
    • G01C15/12Instruments for setting out fixed angles, e.g. right angles

Abstract

The invention discloses building wall perpendicularity detection equipment which comprises a horizontal base, a driving roller, a vertical plate, a height sensor and a displacement sensor, wherein the driving roller is arranged on the horizontal base; the vertical plate is fixedly arranged on the horizontal base, and the displacement sensor is connected on the vertical slide rail in a sliding manner; each driving roller comprises an outer wheel ring, an outer eccentric wheel, an inner eccentric wheel, a connecting disc and a universal transmission mechanism; the outer eccentric wheel and the inner eccentric wheel can realize independent rotation; the inner eccentric wheel is connected with the connecting disc through a universal transmission mechanism; the universal transmission mechanism comprises a fixed block, a universal transmission joint and a driving shaft; each driving shaft is provided with a height sensor, and each height sensor can detect the height between the corresponding driving shaft and the ground; the bottom of the horizontal base is connected with the driving shaft of each driving roller through a cantilever. The invention is not attached to the surface of the wall body, has no requirement on detection time, can be immediately detected and used after the slurry or the mortar layer is leveled, and has the advantages of quick test, strong detection applicability and high measurement precision.

Description

Building wall perpendicularity detection device
Technical Field
The invention relates to detection equipment for the field of buildings, in particular to building wall perpendicularity detection equipment.
Background
In the decoration process, a decoration surface is required to be attached to the wall surface, and the wall surface is required to be ground and plastered before the decoration process; in order to guarantee the verticality in the grinding and plastering processes, a verticality detection device is needed.
The existing wall decoration process is mostly based on the plumb method when the verticality is detected, but no place for hanging a plumb line is available indoors in the decoration process, so that the use is troublesome.
The invention relates to a Chinese utility model patent application with the application number of 201220053670.6, which is named as a wall surface flatness detector manufactured by adopting a laser ranging principle and comprises a laser range finder guiding rule and a light hole; be provided with the light trap on the guiding ruler, laser range finder installs on the guiding ruler, and laser range finder's laser emission hole aims at the light trap that sets up on the guiding ruler. The laser range finder adopts a miniature laser range finder. The thickness of the guiding rule is 7 cm. The measuring precision of the laser range finder is 0.1mm, and the reading time of the laser range finder is 2 s. Laser range finder installs in the guiding ruler top, can freely remove about on the guiding ruler, during the measurement, laser range finding is to wall transmission laser beam, shines on being surveyed the wall through the light trap, receives the reflected beam simultaneously, and the time difference and the propagation velocity of light according to the transmission of light and receipt are promptly: distance = time speed, the flatness error can be calculated.
Although the above patent application can calculate the flatness data to a certain extent, it has the following disadvantages:
1. during the measurement, need the manual work to paste the guiding ruler on the wall body, moreover, for preventing that the guiding ruler from perking, arouse to measure inaccurately, need both hands to press the upper and lower end of guiding ruler simultaneously, when laser range finder tested out the wall body unevenness, still need one in addition carry out the mark on the wall body corresponding with laser range finder position to follow-up repair.
2. When the guiding rule is manually attached to the wall, when the wall is not vertical, that is, the upper end and the lower end of the guiding rule are not on the same vertical plane, the flatness data can be tested, but the flatness data cannot be used as a reference basis.
3. When the wall body is just coated with the slurry or the ash layer, the flatness detection device cannot be adopted, because the guiding rule is adhered to the slurry or the ash layer after being attached to the wall body, the surface of the wall body is not flat, and the guiding rule cannot be used any more.
The invention provides a Chinese patent application with the application number of 201610610062.3, which is named as a verticality detection device for building decoration and comprises a support frame, a control module, a vertical plate, an upper transverse plate and a lower transverse plate hinged with the support frame; the control module comprises a photosensitive sensor, a processing unit and a display unit; the photosensitive sensor transmits signals to the processing unit, and the processing unit transmits the signals to the display unit; the vertical plate is vertically arranged, the upper transverse plate and the lower transverse plate are horizontally arranged, and the upper transverse plate and the lower transverse plate are fixedly connected with the upper part and the lower part of the vertical plate respectively; a plumb bob is vertically arranged on the upper transverse plate, the bottom of the plumb bob is fixedly connected with a laser lamp, and the emitting end of the laser lamp is arranged downwards; set up 1 at least photosensitive sensor who is located the laser lamp below on the diaphragm down, photosensitive sensor and laser lamp are in same vertical plane. The invention has novel design, and when in use, the vertical plate is directly attached to the surface to be detected, so that the verticality of the wall surface can be obtained, and whether the wall surface is vertical or not is judged in the decoration process, thereby improving the decoration effect.
Above-mentioned patent application, when the wall straightness test that hangs down, although liberated both hands, nevertheless, there is following problem at all, needs to solve:
1. in order to avoid the influence of the roller on the verticality test, two sides of the roller are respectively hinged with a plate body, the detection device is fixed through the plate bodies, however, when the ground is detected to be uneven or have pits, the whole detection device is in a slightly inclined state, and therefore the test result is not accurate.
2. During the test, need the face laminating that riser and needs detected, therefore, to the wall body after just having paintd mud or ash blanket, also can not adopt above-mentioned straightness detection device that hangs down, because paste the back when riser and wall body, can with mud or ash blanket adhesion, arouse wall body surface unevenness, and the riser also can't reuse. That is, the limit of the use time of the device is reduced, and the detection is slow.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides building wall perpendicularity detection equipment which has the advantages of high automation degree, low labor intensity, capability of freeing two hands, no attachment with the surface of a wall, no requirement on detection time, capability of immediately detecting and using after a slurry or a lime layer is leveled, quick test and strong detection applicability. In addition, the device is not directly attached to a wall body and has no requirement on the flatness of the ground, so that the measurement precision is high and the test data is reliable.
In order to solve the technical problems, the invention adopts the technical scheme that:
a building wall perpendicularity detection device comprises a horizontal base, a driving roller, a vertical plate, a height sensor and a displacement sensor.
The bottom of horizontal base is provided with four drive rollers.
The vertical plate is fixedly arranged at the center of the bottom of the horizontal base, and a vertical sliding rail is arranged on the vertical plate.
The displacement sensor is connected to the vertical sliding rail in a sliding mode and slides up and down along the vertical sliding rail.
Each driving roller comprises an outer wheel ring, an outer eccentric wheel, an inner eccentric wheel, a connecting disc and a universal transmission mechanism.
The outer eccentric wheel and the connecting disc are arranged in parallel, the outer wheel ring is sleeved on the peripheries of the outer eccentric wheel and the connecting disc and is fixedly connected with the connecting disc, and the outer wheel ring is hinged with the outer eccentric wheel.
The outer eccentric wheel is sleeved on the periphery of the inner eccentric wheel and is hinged with the inner eccentric wheel, and the inner eccentric wheel is provided with a hollow eccentric column; the outer eccentric wheel and the inner eccentric wheel can realize independent rotation.
The inner eccentric wheel is connected with the connecting disc through a universal transmission mechanism.
The universal transmission mechanism comprises a fixed block, a universal transmission joint and a driving shaft; the fixed block is fixedly connected with the center of the connecting disc, the driving shaft can rotate and penetrates through the cavity of the eccentric column, and the driving shaft is connected with the fixed block through a universal transmission joint; every is provided with a height sensor on the drive shaft, and every height sensor homoenergetic detects the altitude value that corresponds drive shaft and ground.
The bottom of the horizontal base is connected with the driving shaft of each driving roller through a cantilever.
The free end of the driving shaft is connected with a rim driving motor; the driving device of the outer eccentric wheel is an outer driving motor, and the driving device of the inner eccentric wheel is an inner driving motor.
An inner gear ring and an outer gear ring are sequentially arranged on the circular end surface of the inner eccentric wheel positioned on the periphery of the eccentric column from inside to outside; the inner driving motor is fixed on the inner eccentric wheel through the connecting seat, and a gear of the inner driving motor is meshed with the inner gear ring; the external driving motor is fixed on the external eccentric wheel, and a gear of the external driving motor is meshed with the external gear ring.
The outer driving motor is fixed on the outer eccentric wheel through a connecting bracket.
The height of the vertical plate can be lifted or folded.
The invention has the beneficial effects that: degree of automation is high, low in labor strength, can liberate both hands, and not laminate with the wall body surface, does not have the requirement to check-out time, can be after mud or lime coat are floating, detect immediately and use, the test is quick, detects the suitability and is strong. In addition, the device is not directly attached to a wall body and has no requirement on the flatness of the ground, so that the measurement precision is high and the test data is reliable.
Drawings
Fig. 1 shows a schematic structural diagram of the building wall perpendicularity detection device of the present invention.
Fig. 2 shows a perspective view of the driving roller.
Fig. 3 shows a schematic sectional view of the driving roller.
Among them are:
10. a horizontal base; 11. a cantilever;
20. driving the roller; 21. an outer wheel ring; 22. an outer eccentric wheel; 221. an external drive motor; 222. connecting a bracket; 23. an inner eccentric wheel; 231. an internal drive motor; 232. a connecting shaft; 233. an eccentric column; 234. an inner gear ring; 235. an outer ring gear; 24. a connecting disc; 251. a drive shaft; 252. an outward transmission section; 253. a fixed block;
30. a vertical plate; 31. a vertical slide rail;
40. a height sensor;
50. a displacement sensor; 51. a linear motor;
60. and displaying the control panel.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
As shown in fig. 1, the building wall perpendicularity detection device comprises a horizontal base 10, a driving roller 20, a vertical plate 30, a height sensor 40, a displacement sensor 50 and a display control panel 60.
The bottom of the horizontal base is provided with four drive rollers, and the bottom of the horizontal base is preferably connected with the drive shaft 251 of each drive roller by a cantilever 11.
The vertical plate is fixedly arranged at the center of the bottom of the horizontal base, and a vertical slide rail 31 is arranged on the vertical plate.
The height of vertical board is preferred can go up and down or can fold to can adapt to the not straightness's that hangs down of co-altitude wall body detection, and easily accomodate. Since lifting or folding is the prior art, this application is not described in detail.
The displacement sensor is slidably connected to the vertical slide rail and preferably slides up and down along the vertical slide rail under the drive of the linear motor 51.
As shown in fig. 2 and 3, each of the drive rollers includes an outer race 21, an outer eccentric wheel 22, an inner eccentric wheel 23, a connecting plate 24, and a universal drive mechanism.
The outer eccentric wheel and the connecting disc are arranged in parallel, the outer wheel ring is sleeved on the peripheries of the outer eccentric wheel and the connecting disc and is fixedly connected with the connecting disc, and the outer wheel ring is hinged with the outer eccentric wheel.
The outer eccentric wheel is sleeved on the periphery of the inner eccentric wheel and is hinged with the inner eccentric wheel, and the inner eccentric wheel is provided with a hollow eccentric column 233; the outer eccentric wheel and the inner eccentric wheel can realize independent rotation.
An inner gear ring 234 and an outer gear ring 235 are sequentially arranged on the circular end face of the inner eccentric wheel positioned on the periphery of the eccentric column from inside to outside; the inner driving motor is preferably fixed on the inner eccentric wheel through a connecting seat 232, and a gear of the inner driving motor is meshed with the inner gear ring; the external drive motor is preferably fixed to the external eccentric wheel by means of a connecting bracket 222, and the gear of the external drive motor meshes with the external gear ring.
The inner eccentric wheel is connected with the connecting disc through a universal transmission mechanism.
The universal transmission mechanism comprises a fixed block 253, a universal transmission joint 252 and a driving shaft 251; the fixed block is connected with the center fixed connection of connection pad, and the drive shaft can rotate, and the drive shaft passes in the cavity of eccentric post, and the drive shaft is connected with the fixed block through the universal joint.
Every is provided with a height sensor on the drive shaft, and every height sensor homoenergetic detects the altitude value that corresponds drive shaft and ground.
The height sensor is preferably fixed at the node point of the cantilever and the drive shaft.
The free end of the drive shaft is preferably connected to a rim drive motor, which drives the drive shaft to rotate, and in turn drives the connection disc and the outer rim to rotate via a universal joint.
In addition, the display control panel is arranged as required, and the display control panel is preferably connected with the linear motor, the external driving motor, the internal driving motor, the displacement sensor, the external rim driving motor and the four height sensors.
A method for detecting the perpendicularity of a building wall comprises the following steps.
Step 1, selecting a point to be measured: at least three points to be measured are selected on the ground along the length direction of the building wall to be measured, all the points to be measured are preferably located on the same straight line, and position marking is carried out on each point to be measured.
Step 2, setting parameters: setting parameters on a display control panel; the set parameters comprise the standard range of the wall perpendicularity and the allowable fluctuation range of each height sensor; wherein, when the heights of the four height sensors are all in the allowable fluctuation range, the four height sensors are located in the same horizontal plane.
Step 3, leveling a horizontal base: moving the wall perpendicularity detection equipment to one of the points to be detected marked in the step 1, then starting working of the four height sensors, and automatically testing the distance between the corresponding driving shaft and the ground by each height sensor and recording the distance as a driving shaft height value; when the height value of the driving shaft tested by the height sensor does not fall into the allowable fluctuation range set in the step 2, the outer eccentric wheel and the inner eccentric wheel are driven to rotate, so that the angle control of the outer eccentric wheel and the inner eccentric wheel is realized; while the outer eccentric wheel or the inner eccentric wheel rotates, the height sensor continues to work until the height value of the driving shaft falls into the allowable fluctuation range set in the step 2, and the outer eccentric wheel and the inner eccentric wheel stop rotating; at the moment, the four height sensors are positioned on the same horizontal plane, and the horizontal base is in a horizontal state.
Step 4, testing the perpendicularity of the wall body: the displacement sensor slides up and down once along the vertical slide rail on the vertical plate, and the data change range value of the displacement sensor is recorded in the sliding process.
Step 5, judging the perpendicularity of the wall body: and (4) comparing the data change range value of the displacement sensor in the step (4) with the wall perpendicularity standard range set in the step (2) for judgment.
Step 6, testing the verticality of the rest points to be tested: and (5) respectively moving the wall perpendicularity detection equipment to other points to be detected, and completing wall perpendicularity detection of the other points to be detected according to the methods from the step 3 to the step 5.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the details of the embodiments, and various equivalent modifications can be made within the technical spirit of the present invention, and the scope of the present invention is also within the scope of the present invention.

Claims (1)

1. The utility model provides a building wall hangs down straightness check out test set which characterized in that: the device comprises a horizontal base, a driving roller, a vertical plate, a height sensor and a displacement sensor;
the bottom of the horizontal base is provided with four driving rollers;
the vertical plate is fixedly arranged at the center of the bottom of the horizontal base, and a vertical slide rail is arranged on the vertical plate;
the displacement sensor is connected to the vertical sliding rail in a sliding manner and slides up and down along the vertical sliding rail;
each driving roller comprises an outer wheel ring, an outer eccentric wheel, an inner eccentric wheel, a connecting disc and a universal transmission mechanism;
the outer eccentric wheel and the connecting disc are arranged in parallel, the outer wheel ring is sleeved on the peripheries of the outer eccentric wheel and the connecting disc and is fixedly connected with the connecting disc, and the outer wheel ring is hinged with the outer eccentric wheel;
the outer eccentric wheel is sleeved on the periphery of the inner eccentric wheel and is hinged with the inner eccentric wheel, and the inner eccentric wheel is provided with a hollow eccentric column; the outer eccentric wheel and the inner eccentric wheel can realize independent rotation;
the inner eccentric wheel is connected with the connecting disc through a universal transmission mechanism;
the universal transmission mechanism comprises a fixed block, a universal transmission joint and a driving shaft; the fixed block is fixedly connected with the center of the connecting disc, the driving shaft can rotate and penetrates through the cavity of the eccentric column, and the driving shaft is connected with the fixed block through a universal transmission joint; each driving shaft is provided with a height sensor, and each height sensor can detect the height value of the corresponding driving shaft and the ground;
the bottom of the horizontal base is connected with a driving shaft of each driving roller through a cantilever; the free end of the driving shaft is connected with a rim driving motor; the driving device of the outer eccentric wheel is an outer driving motor, and the driving device of the inner eccentric wheel is an inner driving motor; an inner gear ring and an outer gear ring are sequentially arranged on the circular end surface of the inner eccentric wheel positioned on the periphery of the eccentric column from inside to outside; the inner driving motor is fixed on the inner eccentric wheel through the connecting seat, and a gear of the inner driving motor is meshed with the inner gear ring; the external driving motor is fixed on the external eccentric wheel, and a gear of the external driving motor is meshed with the external gear ring; the outer driving motor is fixed on the outer eccentric wheel through a connecting bracket; the height of the vertical plate can be lifted or folded.
CN201710769006.9A 2017-08-31 2017-08-31 Building wall perpendicularity detection device Active CN107389021B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710769006.9A CN107389021B (en) 2017-08-31 2017-08-31 Building wall perpendicularity detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710769006.9A CN107389021B (en) 2017-08-31 2017-08-31 Building wall perpendicularity detection device

Publications (2)

Publication Number Publication Date
CN107389021A CN107389021A (en) 2017-11-24
CN107389021B true CN107389021B (en) 2020-04-28

Family

ID=60348510

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710769006.9A Active CN107389021B (en) 2017-08-31 2017-08-31 Building wall perpendicularity detection device

Country Status (1)

Country Link
CN (1) CN107389021B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109000632B (en) * 2018-08-27 2020-09-04 长乐雨盟机电科技有限公司 Building construction straightness deviation visulizer that hangs down
CN109812676A (en) * 2019-03-21 2019-05-28 墨点狗智能科技(东莞)有限公司 A kind of transmission mechanism applied to automatic measurement guiding ruler
CN110081871B (en) * 2019-04-22 2021-07-20 安徽安泰建工集团有限公司 Error calibration device for building engineering quality detection
CN110375725A (en) * 2019-07-05 2019-10-25 深圳市华建工程项目管理有限公司 A kind of construction supervision wall testing apparatus for verticality
CN111912394A (en) * 2020-08-07 2020-11-10 刘正波 Perpendicularity detection equipment for building engineering
CN112050795A (en) * 2020-09-04 2020-12-08 安徽黎搏装饰工程有限公司 Vertical detection device for constructional engineering

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621433A (en) * 1983-09-19 1986-11-11 Kabushiki Kaisha Sokkisha Verticality detecting apparatus for plumbing columns
CN202188816U (en) * 2011-08-22 2012-04-11 贾晓杰 Building engineering quality detector set verticality detection ruler calibrating device
CN103432714A (en) * 2013-09-04 2013-12-11 蔡小英 Automatic running gradient adjustment device for running machine
CN204575036U (en) * 2015-04-03 2015-08-19 国质(北京)建设工程检测鉴定中心 A kind of multifunction architecture engineering quality testing testing apparatus for verticality
CN105841680A (en) * 2016-05-10 2016-08-10 文登蓝岛建筑工程有限公司 Device and method for measuring wall perpendicularity
CN206440247U (en) * 2017-02-09 2017-08-25 王文 A kind of novel building construction quality flatness checking device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4621433A (en) * 1983-09-19 1986-11-11 Kabushiki Kaisha Sokkisha Verticality detecting apparatus for plumbing columns
CN202188816U (en) * 2011-08-22 2012-04-11 贾晓杰 Building engineering quality detector set verticality detection ruler calibrating device
CN103432714A (en) * 2013-09-04 2013-12-11 蔡小英 Automatic running gradient adjustment device for running machine
CN204575036U (en) * 2015-04-03 2015-08-19 国质(北京)建设工程检测鉴定中心 A kind of multifunction architecture engineering quality testing testing apparatus for verticality
CN105841680A (en) * 2016-05-10 2016-08-10 文登蓝岛建筑工程有限公司 Device and method for measuring wall perpendicularity
CN206440247U (en) * 2017-02-09 2017-08-25 王文 A kind of novel building construction quality flatness checking device

Also Published As

Publication number Publication date
CN107389021A (en) 2017-11-24

Similar Documents

Publication Publication Date Title
CN107389021B (en) Building wall perpendicularity detection device
CN107607077B (en) Building ground measurement method of planeness
CN107389048A (en) Construction wall measuring for verticality method
CN112539737A (en) Flatness measuring device for paving floor tiles in constructional engineering and implementation method
CN216620974U (en) Accurate measuring mechanism of building engineering straightness that hangs down
CN107036578B (en) Foundation pile pore-forming quality detection system and detection method thereof
CN110345933B (en) Novel detection device for house gradient
CN107607078B (en) Building ground roughness detection equipments
CN213985296U (en) Depth-fixed hovering type ultrasonic liquid level meter
CN213238877U (en) Building settlement measuring device
CN205482954U (en) Multi -functional distancer
CN215217525U (en) Laser measuring device and automatic measuring equipment using same
CN218120979U (en) Dynamic monitoring device for super high-rise building structure
CN212747779U (en) Levelness measuring instrument for engineering supervision
CN214502380U (en) Pavement structure thickness detection device based on sensor
CN112945117B (en) Movable bridge deflection detector for bridge engineering detection
CN210533371U (en) Building design spot measurement room auxiliary stand is built in room
CN213329139U (en) Foundation pit support detection tool
CN211651588U (en) Automatic rotating device for high formwork settlement monitoring laser point cloud based on unmanned aerial vehicle
CN210036700U (en) Inclination angle measuring device
CN210570549U (en) Foundation pit position measuring device
CN114624677A (en) Distance measuring device for civil engineering
CN113529824A (en) Device and method for detecting thickness of sediment at bottom of drilled pile
CN219869562U (en) Real estate building area measuring device
CN211042196U (en) Slope detector based on gear transmission

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant