CN115950342A - Inclination angle measuring equipment and using method thereof - Google Patents
Inclination angle measuring equipment and using method thereof Download PDFInfo
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- CN115950342A CN115950342A CN202310106995.9A CN202310106995A CN115950342A CN 115950342 A CN115950342 A CN 115950342A CN 202310106995 A CN202310106995 A CN 202310106995A CN 115950342 A CN115950342 A CN 115950342A
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- Y—GENERAL 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The application discloses inclination angle measuring equipment and a using method thereof, and belongs to the technical field of inclination angle measurement. Comprises a shell; a controller mounted on the housing; and the inclination angle measuring structure is arranged in the shell and used for continuously measuring the inclination angle parameters of the building structure. This application is through the one side and the reference surface laminating with the casing, and promote the casing to measuring the face, through the connecting plate with measure the face laminating, when measuring the face for the inclined plane, the connecting plate drives the connecting axle and removes, make the swivel mount rotatory, it is rotatory to make the rotation axis drive the pointer, measure the inclination, and easy operation, be convenient for carry out the measurement operation of continuity, effectively solved when using need adsorb it on engineering construction, and still can receive the influence that the building rocked when carrying out the inclination measurement, and simultaneously, the unable continuity of carrying out the inclination measurement to the wall body, the problem of inclination measuring's efficiency has been reduced.
Description
Technical Field
The application relates to the technical field of inclination measurement, in particular to inclination measurement equipment and a using method thereof.
Background
The dip angle measurement is to measure the angular displacement, generally adopt the inclinometer to measure, attach the inclinometer to the structure while measuring, regard gravity action line as the reference and measure the angular displacement that the reading structure takes place, it is a kind of engineering measurement, the structural test is to measure the relevant parameter that can reflect the actual working property of structure or structural component with the experimental technique as the means, provide the important basis for judging bearing capacity and safe reserve of the structure, the angular displacement is an important measured parameter in the structural test, it reflects the integral working condition of the structure, a prior art publication No. CN115479585A provides a dip angle measuring equipment used for engineering measurement, the apparatus includes the shoe plate, the sidewall of the shoe plate has adsorption mechanism used for adsorbing it on the engineering building, and the sidewall of the shoe plate connects with the tie plate fixedly, the upper sidewall of the tie plate connects with the rotor plate through the first spindle rotation, and the lower sidewall of the rotor plate has limit mechanisms used for limiting the first spindle.
Although the prior art scheme among the above-mentioned can carry out the speed limit to the swing velocity of gravity line pointer, and can mark the fluctuation range at inclination, thereby make the measuring effect to the inclination better, but above-mentioned inclination measuring equipment need adsorb it on engineering building when using, and still can receive the influence that the building rocked when carrying out the inclination measurement, and simultaneously, can't carry out the continuity to the wall body and carry out the inclination measurement, the efficiency of inclination measurement has been reduced, present inclination measurement mechanism can't be adapted to the inclination measurement of the wall of the darker degree of depth of corner department in addition, and take place the pointer jamming easily and can't in time discover to lead to measuring the distortion in the measurement process.
In view of the above, we propose an inclination angle measuring apparatus and a method of using the same.
Disclosure of Invention
1. Technical problem to be solved
An object of the present application is to provide an inclination angle measuring device and a method for using the same, so as to solve the problems mentioned in the above background art.
2. Technical scheme
The embodiment of the application provides a dip angle measuring equipment, includes:
a housing;
a controller mounted on the housing;
and the inclination angle measuring structure is arranged in the shell and used for continuously measuring the inclination angle parameters of the building structure.
Two the connecting axle is electronic scalable design still be provided with fixed knot on the rotation axis and construct, be provided with spring hold mechanism in this fixed knot constructs and presses reset mechanism, and spring hold mechanism drives the pointer and rotates the locking after corresponding angle after the inclination measurement finishes, presses reset mechanism and responds to the single and press the action and accomplish the rotation of pointer and reset.
Through adopting above-mentioned technical scheme, through setting up inclination measurement structure in the casing, equipment is small and exquisite, portable, and is convenient for carry out the measurement of continuity.
As an alternative of this application file technical scheme, inclination measurement structure is including setting up the removal case in the casing, and the inside of removal case is provided with the rotation axis, the outside of rotation axis is rotated through the bearing and is connected with the link, and the link is installed in the removal incasement, all sliding connection has the connecting axle in the upper and lower both ends of removal incasement portion one side, still install the swivel mount on the rotation axis, and the swivel mount with the one end of connecting axle is rotated through the pivot and is connected, electric putter is installed to the inside one side of casing, and electric putter's one end with the removal case outer wall is connected.
Through adopting above-mentioned technical scheme, extrude the rotating turret through the connecting axle for the rotation axis rotates, can measure simple operation convenient to the inclined plane.
As an alternative scheme of this document, the connecting axle is kept away from the one end of removal case is connected with the connecting plate through the pivot rotation.
Through adopting above-mentioned technical scheme, through the setting of connecting plate, be convenient for and measure the face laminating, form and measure the measuring plane, avoid the connecting axle when measuring unevenness the face, the error appears.
As an alternative scheme of the technical scheme of the application, a first spring is further arranged outside the connecting shaft, and two ends of the first spring are connected with the inner wall of the movable box and the connecting shaft respectively.
Through adopting above-mentioned technical scheme, through the setting of first spring, the connecting plate of being convenient for resets.
As an alternative scheme of this application file technical scheme, the slide rail is all installed to the upper and lower both sides of removal case, and all sliding connection has the guide rail in the slide rail, the guide rail is installed in the casing.
Through adopting above-mentioned technical scheme, through the setting of slide rail and guide rail, be convenient for carry on spacingly to the removal case.
As an alternative of this document technical scheme, the casing is close to the movable mouthful has been seted up to one side of connecting plate, and the both ends of movable mouthful all install and support the piece, the movable mouthful with the connecting plate parallel and level.
Through adopting above-mentioned technical scheme, through the setting that supports the piece, be convenient for with measure the face laminating, carry on spacingly to the casing for when measuring the slope department, reserve the measuring position.
As an alternative of this document technical scheme, the calibrated scale is installed in the front of removal case, and the hole that the rotation axis runs through is seted up at the middle part of calibrated scale, the externally mounted of rotation axis has the pointer, the rotation axis is kept away from the one end of pointer is provided with fixed knot and constructs.
Through adopting above-mentioned technical scheme, through the setting of calibrated scale and pointer, be convenient for measure the rotation of axis degree of rotation, be convenient for look over the inclination parameter, be convenient for the record.
As an alternative of this application file technical scheme, fixed knot constructs including the loose axle of sliding connection in the rotation axis, and the one end of loose axle installs first friction disk, the outside block of first friction disk has the second friction disk, and the second friction disk installs in the removal incasement, the removal incasement still sliding connection have the depression bar, and the one end of depression bar with first friction disk rotates through the pivot and connects.
Through adopting above-mentioned technical scheme, through the frictional force between first friction disk and the second friction disk, fixed the rotation axis, improved the convenience.
As an alternative of this application file technical scheme, the keyway has been seted up to the inside of loose axle, and sliding connection has the integral key shaft in the keyway, the integral key shaft one end with rotation axis inner wall fixed connection, the outside of integral key shaft is provided with the second spring, and the both ends of second spring respectively with the rotation axis with loose axle fixed connection.
Through adopting above-mentioned technical scheme, through the setting of keyway and integral key shaft, be convenient for carry on spacingly between rotation axis and the loose axle, and through the setting of second spring, be convenient for extrude first friction disk for first friction disk and second friction disk remain the laminating throughout.
The embodiment of the application provides a use method of inclination angle measuring equipment, which comprises the following steps:
s1, measuring an inclination angle;
before measurement, the two connecting shafts are respectively controlled to extend for different lengths, whether the pointer reaches a preset position is observed, if the pointer does not reach the preset position, the pointer is indicated to generate rotation clamping stagnation, when the deeper wall corner is measured in an inclined mode, the two connecting shafts can be controlled to extend to the same length in advance, the connecting plates are aligned to the measuring surface of a measuring object, one side of the shell is attached to the reference surface and pushes the shell, when one group of stop blocks are in contact with the measuring surface, the electric push rods are controlled to push the moving box, the connecting plates are attached to the measuring surface, and when the connecting plates are attached to the measuring surface, the rotating frame drives the rotating shaft to rotate, so that the pointer rotates, and the inclination angle is measured;
s2, fixing the pointer;
after the measurement is finished, the first friction disc is extruded through the second spring, so that the first friction disc and the second friction disc are tightly attached to fix the pointer;
s3, recording data;
and reading the position of the pointer on the dial and recording the data.
3. Advantageous effects
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
1. through having spring hold mechanism and pressing canceling release mechanical system's fixed establishment in this application, only need single whole measurement that can accomplish the inclination in the completion carries out the measurement process to the green pepper, and can realize that the inclination angle before the survey record ends keeps the locking, the pointer self-checking before the measurement work can also be realized when the electronic scalable design of two connecting axles makes the inclination that can carry out different corner degree of depth walls in addition.
2. This application is through the one side and the reference surface laminating with the casing, and promote the casing to measuring the face, through the connecting plate with measure the face laminating, when measuring the face for the inclined plane, the connecting plate drives the connecting axle and removes, make the swivel mount rotatory, it is rotatory to make the rotation axis drive the pointer, measure the inclination, and easy operation, be convenient for carry out the measurement operation of continuity, effectively solved when using need adsorb it on engineering construction, and still can receive the influence that the building rocked when carrying out the inclination measurement, and simultaneously, the unable continuity of carrying out the inclination measurement to the wall body, the problem of inclination measuring's efficiency has been reduced.
3. This application is through inclination measurement structure, when measuring the face for the inclined plane, promotes the in-process to the casing, and one of them supports piece and inclined plane laminating for keep perpendicular with the reference surface, and promote the removal case through electric putter, make the connecting plate laminate the inclined plane, thereby measure the inclination, easy operation, and promoting the in-process to the casing, can place the level bar under the casing, the calibration reference surface level value of being convenient for.
4. This application is through fixed knot structure, through first friction disk and second friction disk remain the laminating throughout, fixes the rotation axis, and when the connecting plate exerted pressure to the connecting axle, first friction disk and second friction disk friction rotated, kept fixed with the laminating of rotation axis for after the measurement is accomplished, the rotation axis keeps fixed.
Drawings
FIG. 1 is a perspective view of the structure of the present application;
FIG. 2 is a perspective cross-sectional view of the structure of the present application;
FIG. 3 is a perspective view of a portion of the present application;
FIG. 4 is a cross-sectional view of the structure of the present application;
FIG. 5 is an enlarged view of the structure at A in FIG. 4 of the present application;
FIG. 6 is an exploded perspective view of the fixed structure of the present application;
the reference numbers in the figures illustrate: 1. a housing; 2. a controller; 3. a mobile box; 4. a rotating shaft; 5. a connecting frame; 6. a rotating frame; 7. a connecting shaft; 8. a connecting plate; 9. a first spring; 10. an electric push rod; 11. a slide rail; 12. a guide rail; 13. a resisting block; 14. a dial scale; 15. a pointer; 16. a movable shaft; 17. a keyway; 18. a spline shaft; 19. a second spring; 20. a first friction disk; 21. a second friction disk; 22. a pressure lever.
Detailed Description
The present application is described in further detail below with reference to the attached drawing figures.
The first embodiment is as follows:
referring to fig. 1 to 2, an inclination angle measuring apparatus provided in an embodiment of the present application includes a housing 1, a controller 2 installed on the housing 1, and an inclination angle measuring structure disposed in the housing 1 and configured to continuously measure an inclination angle parameter of a building structure.
Two connecting axle 7 is electronic scalable design still be provided with fixed knot on the rotation axis 4 and construct, be provided with spring hold mechanism and press the canceling release mechanical system in this fixed knot constructs, and spring hold mechanism locks at this angle after inclination measurement finishes after swivel mount 6 drives the pointer and rotates to corresponding angle, presses the canceling release mechanical system and responds to the single action of pressing and accomplish the rotation reset to the pointer.
Referring to fig. 2 to 3, the present application provides an inclination angle measuring structure, which is small and portable and facilitates continuous measurement by being disposed in a housing 1, the inclination angle measuring structure includes a movable box 3 disposed in the housing 1, a rotating shaft 4 is disposed in the movable box 3, a connecting frame 5 is rotatably connected to an exterior of the rotating shaft 4 through a bearing, the connecting frame 5 is disposed in the movable box 3, upper and lower ends of an interior side of the movable box 3 are slidably connected to a connecting shaft 7, a rotating frame 6 is further disposed on the rotating shaft 4, the rotating frame 6 is rotatably connected to an end of the connecting shaft 7 through a rotating shaft, an end of the connecting shaft 7 remote from the movable box 3 is rotatably connected to a connecting plate 8 through the rotating shaft, a first spring 9 is disposed on an exterior of the connecting shaft 7, and both ends of the first spring 9 are respectively connected to an inner wall of the movable box 3 and the connecting shaft 7, an end of the electric push rod 10 is disposed on an interior side of the housing 1, and an outer wall of the movable box 3 is connected to an outer wall of the movable box 3, a slide rail 12 is disposed in the housing 1, a sliding rail 4, and a needle-pressing block 14 is disposed on an exterior of the movable box 4, and a side of the movable box 3, and a needle-pressing block is disposed on an end of the movable box, and a needle-pressing block 14 is disposed on an outer side of the movable box 4, be convenient for and measure the face laminating, form and to measure the volume of awaiting measuring plane, avoid connecting axle 7 when measuring unevenness the face, the error appears, cross the setting of piece 13, be convenient for and measure the face laminating, carry on spacingly to casing 1 for when measuring the slope, reserve the measuring position, through calibrated scale 14 and pointer 15's setting, be convenient for measure 4 rotatory degrees of rotation axis, be convenient for look over the inclination parameter, the record of being convenient for.
Referring to fig. 4 to 6, an embodiment of the present application provides a fixing structure, the fixing structure includes a movable shaft 16 slidably connected in a rotating shaft 4, a key groove 17 is formed in the movable shaft 16, a spline shaft 18 is slidably connected in the key groove 17, one end of the spline shaft 18 is fixedly connected to an inner wall of the rotating shaft 4, a second spring 19 is disposed outside the spline shaft 18, two ends of the second spring 19 are respectively fixedly connected to the rotating shaft 4 and the movable shaft 16, a first friction disc 20 is mounted at one end of the movable shaft 16, a second friction disc 21 is clamped outside the first friction disc 20, the second friction disc 21 is mounted in a moving box 3, a pressure rod 22 is further slidably connected in the moving box 3, one end of the pressure rod 22 is rotatably connected to the first friction disc 20 through the rotating shaft, the key groove 17 and the spline shaft 18 are arranged to facilitate limiting between the rotating shaft 4 and the movable shaft 16, and the first friction disc 20 is conveniently pressed through the second spring 19, so that the first friction disc 20 and the second friction disc 21 are always attached.
Example two:
referring to fig. 1 to 6, an embodiment of the present application provides a method for using an inclination measuring device, which includes the following steps:
step one, measuring an inclination angle;
before measurement, the two connecting shafts 7 are respectively controlled to extend for different lengths, whether the pointer reaches a preset position is observed, if the pointer does not reach the preset position, the pointer is indicated to be blocked in rotation, when the deeper wall corner is measured in an inclined mode, the two connecting shafts 7 can be controlled to extend to the same length in advance, the connecting plates 8 are aligned to the measuring surface of a measured object, one side of the shell 1 is attached to the reference surface, the shell 1 is pushed, when one group of stop blocks are in contact with the measuring surface, the electric push rods 10 are controlled to push the moving box 3, the connecting plates 8 are attached to the measuring surface, and when the connecting plates 8 are attached to the measuring surface, the rotating shafts 4 are driven by the rotating frame 6 to rotate, so that the pointer 15 rotates, and the inclination angle is measured;
step two, fixing the pointer 15;
after the measurement is finished, the first friction disc 20 is pressed through the second spring 19, so that the first friction disc 20 and the second friction disc 21 are tightly attached to fix the pointer 15;
step three, data recording;
the position of the pointer 15 on the dial 14 is read and data is recorded.
Through having spring hold mechanism and pressing reset mechanism's fixed establishment, only need single whole measurement that can accomplish the inclination in the completion carries out the measurement process to the green pepper, and can realize that the inclination angle before the survey record ends keeps the locking, the pointer self-checking before the measurement work can also be realized when the electronic scalable design of two connecting axles makes the inclination that can carry out different corner degree of depth walls in addition.
Specifically, the two connecting shafts 7 are respectively controlled to extend for different lengths before measurement, whether the pointer reaches a preset position or not is observed, if the pointer does not reach the preset position, the pointer is blocked in rotation or fails in connection, and in addition, when the inclination measurement of a deeper wall corner is carried out, the two connecting shafts 7 can be controlled to extend for different lengths in advance.
The implementation principle of the inclination angle measuring equipment in the embodiment of the application is as follows:
when the device works, the connecting plate 8 is aligned to a measuring surface of a measuring object, one side of the shell 1 is attached to a reference surface, the shell 1 is pushed, when a group of stop blocks are in contact with the measuring surface, the electric push rod 10 is controlled to push the moving box 3, the connecting plate 8 is attached to the measuring surface, the connecting plate 8 drives the connecting shaft 7 to move when the connecting plate 8 is attached to the measuring surface, the rotating frame 6 drives the rotating shaft 4 to rotate, the first spring 9 generates elastic deformation, and the pointer 15 rotates under the rotating action of the rotating shaft 4 to measure the inclination angle;
during operation, after measurement is finished, the first friction disc 20 is extruded through the second spring 19, so that the first friction disc 20 and the second friction disc 21 are tightly attached to fix the pointer 15, the position of the pointer 15 on the dial 14 is read, and data are recorded;
during operation, the pressure rod 22 is pressed, the movable shaft 16 extrudes the second spring 19, the second spring 19 generates elastic deformation, the first friction disc 20 and the second friction disc 21 are separated, the first friction disc 20 and the pressure rod 22 are in rotating connection with the bearing, the rotating shaft 4 is rotated and reset, and the pointer 15 is reset simultaneously, so that continuous inclination angle measurement is facilitated.
Therefore, through the fixing mechanism with the spring retaining mechanism and the pressing reset mechanism, the whole-process measurement of the inclination angle can be completed by only one person in the process of completing the measurement of the green pepper, the inclination angle can be kept and locked before the measurement and the recording are completed, and in addition, the electric telescopic design of the two connecting shafts 7 can realize the inclination angle measurement of wall surfaces with different corner depths and can also realize the pointer self-check before the measurement work.
Claims (10)
1. A tilt angle measurement device, comprising:
a housing;
a controller mounted on the housing;
the inclination angle measuring structure is arranged in the shell;
the inclination measuring structure comprises a movable box arranged in a shell, a rotating shaft is arranged in the movable box, a connecting frame is connected to the outer portion of the rotating shaft in a rotating mode through a bearing, the connecting frame is installed in the movable box, connecting shafts are connected to the upper end and the lower end of one side of the inner portion of the movable box in a sliding mode, a rotating frame is further installed on the rotating shaft and connected with one end of each connecting shaft in a rotating mode through rotating shafts, an electric push rod and two connecting shafts are installed on one side of the inner portion of the shell and are of an electric telescopic design, a fixing structure is further arranged on the rotating shaft, a spring retaining mechanism and a pressing reset mechanism are arranged in the fixing mechanism, the spring retaining mechanism drives a pointer to rotate to a corresponding angle and then locks the pointer at the angle after the inclination measuring is finished, and the pressing reset mechanism responds to a single pressing action to complete rotation reset of the pointer.
2. The tilt angle measurement apparatus according to claim 1, wherein: one end of the electric push rod is connected with the outer wall of the movable box.
3. The tilt angle measurement apparatus according to claim 2, wherein: one end of the connecting shaft, which is far away from the moving box, is rotatably connected with a connecting plate through a rotating shaft.
4. The tilt angle measurement apparatus according to claim 2, wherein: the outside of connecting axle still is provided with first spring, and the both ends of first spring are connected with removal incasement wall and connecting axle respectively.
5. The tilt angle measurement apparatus according to claim 2, wherein: the upper and lower both sides of removal case all install the slide rail, and all sliding connection has the guide rail in the slide rail, the guide rail is installed in the casing.
6. The tilt measurement device of claim 3, wherein: the shell is close to one side of the connecting plate, a movable opening is formed in the side, close to the connecting plate, of the shell, supporting blocks are installed at two ends of the movable opening, and the movable opening is flush with the connecting plate.
7. The tilt measurement device of claim 2, wherein: the dial is installed in the front of removal case, and the hole that the rotation axis runs through is seted up at the middle part of dial, the externally mounted of rotation axis has the pointer, the rotation axis is kept away from the one end of pointer is provided with fixed knot and constructs.
8. The tilt measurement device of claim 7, wherein: the fixing structure comprises a movable shaft which is connected in the rotating shaft in a sliding mode, a first friction disc is installed at one end of the movable shaft, a second friction disc is clamped outside the first friction disc and installed in the moving box, a pressure rod is connected in the moving box in a sliding mode, and one end of the pressure rod is connected with the first friction disc in a rotating mode through a rotating shaft.
9. The tilt measurement device of claim 8, wherein: the keyway has been seted up to the inside of loose axle, and sliding connection has the integral key shaft in the keyway, the integral key shaft one end with rotation axis inner wall fixed connection, the outside of integral key shaft is provided with the second spring, and the both ends of second spring respectively with the rotation axis with loose axle fixed connection.
10. A method of using a tilt measuring device comprising a tilt measuring device according to any of claims 1-9, characterized by the steps of:
s1, measuring an inclination angle;
before measurement, the two connecting shafts are respectively controlled to extend for different lengths, whether the pointer reaches a preset position is observed, if the pointer does not reach the preset position, the pointer is indicated to be in rotation clamping stagnation, when the deep wall corner is subjected to inclination measurement, the two connecting shafts can be controlled to extend for the same length in advance, the connecting plates are aligned to the measuring surface of a measured object, one side of the shell is attached to the reference surface and pushes the shell, when one group of stop blocks are in contact with the measuring surface, the electric push rods are controlled to push the moving box, the connecting plates are attached to the measuring surface, and the rotating frame drives the rotating shaft to rotate while the connecting plates are attached to the measuring surface, so that the pointer rotates, and the inclination angle is measured;
s2, fixing the pointer;
after the measurement is finished, the first friction disc is extruded through the second spring, so that the first friction disc and the second friction disc are tightly attached to fix the pointer;
s3, recording data;
and reading the position of the pointer on the dial and recording the data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310106995.9A CN115950342A (en) | 2023-02-10 | 2023-02-10 | Inclination angle measuring equipment and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310106995.9A CN115950342A (en) | 2023-02-10 | 2023-02-10 | Inclination angle measuring equipment and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115950342A true CN115950342A (en) | 2023-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310106995.9A Withdrawn CN115950342A (en) | 2023-02-10 | 2023-02-10 | Inclination angle measuring equipment and using method thereof |
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| Country | Link |
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| CN (1) | CN115950342A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664084A (en) * | 2024-02-02 | 2024-03-08 | 山东建勘集团有限公司 | Special gradient measuring device of building engineering |
-
2023
- 2023-02-10 CN CN202310106995.9A patent/CN115950342A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117664084A (en) * | 2024-02-02 | 2024-03-08 | 山东建勘集团有限公司 | Special gradient measuring device of building engineering |
| CN117664084B (en) * | 2024-02-02 | 2024-04-26 | 山东建勘集团有限公司 | Special gradient measuring device of building engineering |
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Application publication date: 20230411 |