CN216791177U - Gravity calibration type wind-resistant indium steel ruler - Google Patents
Gravity calibration type wind-resistant indium steel ruler Download PDFInfo
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- CN216791177U CN216791177U CN202220536498.3U CN202220536498U CN216791177U CN 216791177 U CN216791177 U CN 216791177U CN 202220536498 U CN202220536498 U CN 202220536498U CN 216791177 U CN216791177 U CN 216791177U
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 97
- 239000010959 steel Substances 0.000 title claims abstract description 97
- 229910052738 indium Inorganic materials 0.000 title claims abstract description 88
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 230000005484 gravity Effects 0.000 title claims abstract description 12
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 11
- 239000003973 paint Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 238000005259 measurement Methods 0.000 description 22
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
A gravity calibration type wind-resistant indium steel ruler comprises an indium steel ruler body, wherein a leveling bubble is arranged on the indium steel ruler body, a plurality of supporting legs for supporting the indium steel ruler body are arranged on the indium steel ruler body, slide ways are arranged on two sides of the indium steel ruler body, and a connecting rod with an adjustable height position is arranged in each slide way; the supporting legs are connected to the connecting rods; the unfolding angle of the supporting legs is controlled by the supporting leg control clamping pieces; each supporting leg comprises a telescopic leg, a support leg, a walking wheel and a telescopic leg locking mechanism; the telescopic legs and the support legs are connected together through a telescopic leg locking mechanism and slide relatively; the indium steel ruler body is provided with a leveling bubble; the bottom of the indium steel ruler body is provided with a battery compartment and a communication structure. Utilize the gravity of indium steel chi body and balancing weight, the swing joint between cooperation connecting rod and the supporting leg realizes the automatic perpendicular horizontal ground of indium steel chi body, utilizes air level group to confirm that the device main part remains vertical state throughout, is favorable to making things convenient for the automatic perpendicular of indium steel chi body.
Description
Technical Field
The utility model relates to the technical field of engineering leveling and building settlement measurement, in particular to a gravity calibration type wind-resistant indium steel ruler.
Background
With the rapid development of infrastructure construction in China, the method is widely applied to aspects such as route leveling, tunnel monitoring and measuring, building construction, bridge construction and the like. Meanwhile, the level becomes indispensable equipment, and meanwhile, the precision requirement on leveling is higher and higher, and the high-precision leveling also becomes the work which needs to be carried out every day in the construction process. In high-precision leveling, the bar code indium steel ruler is one of necessary articles for high-precision leveling.
The bar code indium steel ruler used for leveling closed measurement in the current engineering measurement has many advantages including accurate reading value and small influence of external environment on the bar code indium steel ruler.
However, in the actual high-precision leveling process, various factors exist, which can lead to inaccurate reading of the high-precision leveling instrument, wherein the most important influence is whether the indium steel ruler is vertically arranged. It directly affects the accuracy of the measurement, making the final leveling value difficult to close. The environment that carries out leveling generally all is outdoor environment, and outdoor environment is abominable, often can appear sudden strong wind, can make indium steel chi can be along with the wobbling problem of wind. The existing bar code indium steel ruler is manually supported for measurement, and has the characteristics of manual fatigue and non-centralized energy, so that larger measurement errors are often brought. Therefore, according to the relevant contents of the national first-level and second-level leveling standards, in order to control the error within a controllable range, multiple times of measurement and statistical inspection are required, so that the manpower and precious operation time are wasted.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problems in the prior art, the utility model provides a gravity calibration type wind-resistant indium steel ruler. Utilize the gravity of indium steel chi body and battery compartment self, the cooperation indium steel chi body passes through swing joint between connecting rod and the landing leg, realizes the automatic perpendicular horizontal ground of indium steel chi, improves measurement accuracy, reduces artificial intervention's degree, solves the error scheduling problem that proposes in above-mentioned background art. In addition, a nut is arranged on the leg included angle control clamp, so that the problem that the indium steel ruler can swing along with wind in the background technology is solved.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the gravity calibration type wind-resistant indium steel ruler comprises an indium steel ruler body, wherein a leveling bubble is arranged on the indium steel ruler body, a plurality of supporting legs for supporting the indium steel ruler body are arranged on the indium steel ruler body, slide ways are arranged on two sides of the indium steel ruler body, and connecting rods with adjustable height positions are arranged in the slide ways; the supporting legs are connected to the connecting rods; the unfolding angle of the supporting legs is controlled by the supporting leg control clamping pieces; each supporting leg comprises a telescopic leg, a support leg, a walking wheel and a telescopic leg locking mechanism; the telescopic legs and the support legs are connected together through the telescopic leg locking mechanisms and slide relatively; at least two groups of level bubbles with different heights are arranged on the indium steel ruler body; the bottom of the indium steel ruler body is provided with a battery compartment and a communication structure.
Further, the connecting rod includes interior wheel, body frame, nut A, nut B, and the body frame of connecting rod is equipped with the arch of wheel usefulness in the installation, and the inboard slide position department that corresponds of indium steel ruler sets up four interior wheels, and the body frame both sides correspond the indium steel ruler outside and set up nut A and nut B, and the department that corresponds nut A and nut B sets up screw thread A and screw thread B, and the body frame space between nut A and the nut B is used for installing the supporting leg.
Furthermore, a rubber pad A is arranged on the main frame corresponding to the outer side of the indium steel ruler, a rubber pad B and a rubber pad C are correspondingly arranged on one sides of the nut A and the nut B, which are opposite to each other, and a main frame space between the rubber pads B and C is used for mounting the supporting legs; the rubber ring is sleeved on the outer side of the inner wheel.
Furthermore, three groups of level bubbles are arranged on the indium steel ruler body, namely a level bubble A, a level bubble B and a level bubble C, and the level bubble A, the level bubble B and the level bubble C are respectively arranged at the bottom, the middle and the top of the indium steel ruler; the level bubble A, the level bubble B and the level bubble C are all composed of two horizontal bubble bead type level bubbles which are vertically arranged.
Further, the supporting leg includes four, set up two slides on the indium steel chi, two supporting legs are respectively installed to two passageways that the indium steel chi corresponds, the angle that the supporting leg expandes passes through the control of landing leg control clamping piece, the supporting leg control clamping piece is rectangular form clamping piece body, clamping piece body one end is equipped with the mounting hole that the installation was fixed the bolt and is used and the rectangular hole that the installation was pressed from both sides tight bolt and is used, fixing bolt fixes on one of them supporting leg, it fixes on another supporting leg to press from both sides tight bolt, it controls the supporting leg angle that opens and shuts at the change of slivering hole position to press from both sides tight bolt.
Furthermore, each supporting leg is formed by overlapping two square tubes with different cross-sectional areas, the square tube above is a support leg, the square tube below is a telescopic leg, eight steel balls are arranged in the telescopic leg locking mechanism, four steel balls are arranged at the lower part of the support leg, and the other four steel balls are arranged at the upper part of the telescopic leg.
Furthermore, the detachable walking wheel is installed to the bottom of supporting leg, pastes one deck rubber layer in the walking wheel outside.
Further, yellow paint with a light reflection identification function is coated on the supporting legs, and aluminum powder is added into the paint.
Furthermore, the walking wheel locking mechanism comprises a locking nut arranged above the walking wheel.
In summary, the technical scheme of the utility model has the following beneficial effects:
(1) according to the utility model, the gravity of the bar code type indium steel ruler body and the balancing weight is utilized, the indium steel ruler body is matched with the movable connection between the connecting rod and the four supporting legs, the indium steel ruler body is automatically vertical to the horizontal ground, the level bubble group is utilized to determine that the main body of the device is always in a vertical state, the indium steel ruler body is convenient to automatically vertical, the operation is simple, and the measurement precision is improved.
(2) The utility model can change the walking state of the indium steel ruler and the rotation movement during the measurement through the switch walking wheel locking mechanism, ensures the stability in the processes of paying-off measurement, settlement monitoring and the like through the multiple walking wheel locking mechanisms, obviously reduces the influence of the external environment on the measurement result, reduces the labor intensity of measurement personnel, is beneficial to improving the stability of the device, is convenient for erecting the device, adapts to different field conditions, and improves the measurement precision.
(3) By arranging the communication structure, the utility model increases the communication efficiency, reduces the communication barrier among measuring personnel and increases the measuring efficiency during remote measurement.
(4) According to the utility model, the connecting rod can slide up and down in a relatively large range by arranging the slide way, so that the device is convenient to erect, the device is suitable for various field conditions and different measurement heights, and the measurement precision is improved.
Drawings
FIG. 1 is a side view of the overall construction of the present invention (with the support legs in a spread apart condition);
FIG. 2 is a front elevational view of the overall construction of the present invention (with the support legs in a stowed condition);
FIG. 3 is a view of a leg angle control clip of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 1;
FIG. 5 is a road wheel locking mechanism diagram of the present invention;
FIG. 6 is a view of the connecting rod position arrangement of the present invention;
FIG. 7 is a view of another angular disposition of the connecting rod of the present invention;
FIG. 8 is a structural view of the main frame of the connecting rod of the present invention;
FIG. 9 is a view of the connection of the leg angle control clip to the support leg.
In the figure:
1 indium steel ruler body, 2 connecting rods, 2.1 main frames, 2.2 inner wheels, 2.3 screw caps A, 2.4 screw caps B, 2.5.1 screw threads A, 2.5.2 screw threads B, 2.6 rubber pads A, 2.7 rubber pads B, 2.8 rubber pads C, 2.9 rubber rings, 3.1 bracket leg groups, 3.1.1 bracket leg A, 3.1.2 bracket leg B, 3.2 telescopic legs, 3.3 travelling wheels, 3.3.1 travelling wheel locking mechanisms, 3.3.2 rubber layers B, 3.4 leg included angle control clamping pieces, 3.4.1 clamping bolts, 3.4.2 fixing bolts, 3.4.3 clamping piece bodies, 3.5 telescopic leg locking mechanisms, 3.5.1 roller group A, 3.5.2 roller group B, 3.5.3 telescopic leg locking mechanisms, 4 knobs, 5 battery leveling bins, 6.1 bubble leveling group A, 6.2 bubble leveling group B, 6.3 leveling group C, and 8 bubble communication pads.
Detailed Description
The features and principles of the present invention will be described in detail below with reference to the accompanying drawings, which illustrate embodiments of the utility model and are not intended to limit the scope of the utility model.
The utility model provides a gravity calibration type wind-resistant indium steel ruler as shown in figures 1-9, which comprises a bar code type indium steel ruler body 1, wherein level bubble groups C6.3, B6.2 and A6.1 are arranged at the upper, middle and lower positions of the bar code type indium steel ruler body. The communication structure is arranged 7 on the underside of the vial group a6.1, and conventional telecommunications equipment can be used. The communication between the two leveling rods and an observer is facilitated. And a ruler pad 8 is arranged at the lower part of the bar code type indium steel ruler body 1. The battery bin 5 (balancing weight) is arranged at the lowest part of the bar code type indium steel ruler body 1. The battery compartment has the effect of balancing weight in the practical and practical process. Can effectively increase perpendicular level, no matter the connecting rod is in the any position of slide, the whole focus that can guarantee bar code indium steel chi is in position below the connecting rod.
A hollow slideway 4 on two sides is arranged in the center of the position 1/4-2/3 of the bar code type indium steel ruler body 1. The connecting rod 2 is arranged in the slideway 4. Four inner wheels 2.2 of the indium steel ruler are arranged at the convex positions of the main connecting rod frames a, b, c and d, and the outer side of each inner wheel is sleeved with a rubber ring 2.9. The inner wheel 2.2 of the indium steel ruler moves back and forth up and down along the slideway 4 and tightly abuts against the inner wall of the bar code type indium steel ruler body 1.
As shown in fig. 6-8, a 1 cm-long thread A2.5.1 is arranged on the main connecting rod frame 2.1 extending out of the bar code type indium steel ruler body 1, and a rubber pad a2.6 is additionally arranged between the thread A2.5.1 and the outer side of the bar code type indium steel ruler body 1. The connecting rod body frame 2.1 is cast by practical solid pure iron so as to ensure the stability of the connecting rod. Increase the holistic rigidity of connecting rod, can not lead to because of slight disturbance in the measurement process, the straightness that hangs down of indium steel chi takes place the skew. The screw cap B2.4 is arranged outside the thread A2.5.1. The nut B2.4 and the rubber pad B2.7 are connected by using casting glue. Nut B can take off nut B through the rotation, wholly takes off the landing leg afterwards, convenient arrangement, deposits. In addition, the angle between the two supporting legs can be controlled by rotating the clamping nut, and the final folding state is achieved. Nut B2.4 and rubber pad B2.7 can rotate as a whole along screw A2.5.1 so that rubber pad A2.6 is connected inseparabler with the bar code type indium steel chi body outside. The nut A2.3 and the rubber pad C2.8 are connected by using casting glue. Nut a2.3 and rubber pad C2.7 as a unit may be rotated along threads B2.5.2 and compress leg set 3.1 and rubber pad B2.7. The nut A and the nut B are both provided with protrusions for increasing the friction force. Rubber pads B and C are shown in position relative to nut a and nut B to compress their two intermediate legs. The support legs are prevented from shifting during measurement.
The support leg group 3.1 consists of a support leg A3.1.1 and a support leg B3.1.2. As shown in fig. 3 and 9, the support leg A3.1.1 and the support leg B3.1.2 are connected to the leg angle control clip 3.4 by the connecting rod 2 to form a stable triangular relationship. The leg included angle control clip 3.4 consists of a clip body 3.4.3, a clamping bolt 3.4.1, a fixing bolt 3.4.2 and a strip hole 3.4.4. The fastening screw 3.4.2 is fastened to the bracket leg B3.1.2 and the clamping screw 3.4.1 is fastened to the bracket leg A3.1.1. The clamping bolt 3.4.1 can slide on the strip hole 3.4.4 of the clamping piece body 3.4.3, and the opening and closing angle of the supporting leg is controlled by screwing and extruding the clamping piece body 3.4.3.
As shown in fig. 4, each of the support legs is formed by overlapping two square tubes with different cross-sectional areas, the square tube above is a support leg, the square tube below is a telescopic leg 3.2, eight steel balls are arranged in the telescopic leg locking mechanism, four steel balls are arranged at the lower part of the support leg, and the other four steel balls are arranged at the upper part of the telescopic leg. The drawing smoothness can be guaranteed, and the stability of the indium steel ruler can be guaranteed when the supporting legs are opened. Yellow paint with a light reflection identification function is coated on all the four support legs, and a proper amount of aluminum powder is added into the paint, so that the light reflection effect is improved.
The diameter of the telescopic leg 3.2 is slightly smaller than that of the support leg. The support leg group is connected with the telescopic legs through telescopic leg locking mechanisms 3.5. The telescopic leg locking mechanism 3.5 mainly comprises a roller group A3.5.1, a roller group B3.5.2 and a telescopic leg locking mechanism knob 3.5.3. Roller set A3.5.1 is connected with the telescopic leg and can slide up and down along the telescopic leg to roll. The roller group B3.5.2 is connected together with the support leg and is arranged on the lower side of the support leg. The telescopic leg locking mechanism knob 3.5.3 achieves the purpose of controlling the telescopic length of the telescopic leg by spirally extruding the telescopic leg. The lower part of each telescopic leg 3.2 is provided with a walking wheel 3.3. As shown in fig. 5, a road wheel locking mechanism 3.3.1 is arranged on the upper part of the road wheel 3.3, and a rubber layer B3.3.2 is arranged on the upper part of the road wheel 3.3 in a surrounding way. Meanwhile, the walking wheels can be disassembled through the quick disassembling device and replaced by the fixing needles to adapt to different geological conditions.
When in use:
And step 2, placing the ruler pad 8 at the correct position according to the measurement paying-off process.
And 3, taking out the ruler from the ruler box, unscrewing two screw caps A2.3 on the connecting rod 2, sleeving the screw caps A2.3 into the bracket leg group 3.1, and screwing the screw caps A2.3. Put bar code type indium steel chi on the ruler pad, rotatory nut B2.4, unscrew for the connecting rod can slide from top to bottom along slide 4. After the height is determined, the telescopic leg locking mechanism 3.5 and the nut B2.4 are screwed.
And step 4, opening the support leg group 3.1, and selecting the opening and closing angle of the support leg group 3.1 according to the measurement field.
And step 5, selecting a level bubble group capable of being clearly observed according to the landform and the measured different positions.
And 6, controlling the balance of the bar code type indium steel ruler in the horizontal direction by adjusting the opening and closing angles of the supporting leg included angle control clamping pieces 3.4.
And 7, observing the change of the air level group in the vertical direction after the balance is achieved in the horizontal direction. The vertically oriented vial is brought to a neutral position by moving the 3.3 road wheels.
And seventhly, after the level bubble in the two directions is centered, the 1 bar code type indium steel ruler is considered to be in a vertical state. And is in a wind-resistant state.
And eighthly, starting to measure by using the lock nut A2.3 and the travelling wheel locking mechanism 3.3.1.
And step nine, the walking wheel locking mechanism 3.3.1 is opened, so that the bar code type indium steel ruler can rotate on the ruler pad 8.
And step ten, starting a retest part and re-executing the steps 6 to 8.
And step eleven, walking, unscrewing the nut B2.4, and lifting the bar code type indium steel ruler to enable the whole walking to move.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (9)
1. A gravity calibration type wind-resistant indium steel ruler comprises an indium steel ruler body, wherein a leveling bubble is arranged on the indium steel ruler body, and a plurality of supporting legs for supporting the indium steel ruler body are arranged on the indium steel ruler body; the supporting legs are connected to the connecting rods; the unfolding angle of the supporting legs is controlled by the supporting leg control clamping pieces; each supporting leg comprises a telescopic leg, a support leg, a walking wheel and a telescopic leg locking mechanism; the telescopic legs and the support legs are connected together through a telescopic leg locking mechanism and slide relatively; at least two groups of level bubbles with different heights are arranged on the indium steel ruler body; the bottom of the indium steel ruler body is provided with a battery compartment and a communication structure.
2. The gravity-calibrated wind-resistant indium steel ruler according to claim 1, wherein the connecting rod comprises an inner wheel, a main frame, a nut A and a nut B, the main frame of the connecting rod is provided with a protrusion for installing the inner wheel, four inner wheels are arranged on the inner side of the indium steel ruler corresponding to slide positions, the nut A and the nut B are arranged on two sides of the main frame corresponding to the outer side of the indium steel ruler, a thread A and a thread B are arranged on the positions corresponding to the nut A and the nut B, and a main frame space between the nut A and the nut B is used for installing the supporting leg.
3. The gravity calibration type wind-resistant indium steel ruler according to claim 2, characterized in that a rubber pad A is arranged on the main frame corresponding to the outer side of the indium steel ruler, a rubber pad B and a rubber pad C are respectively and correspondingly arranged on the opposite sides of the nut A and the nut B, and a main frame space between the rubber pad B and the rubber pad C is used for installing a supporting leg; and a rubber ring is sleeved on the outer side of the inner wheel.
4. The gravity-calibrated wind-resistant indium steel ruler according to claim 1, wherein the indium steel ruler body is provided with three groups of level bubbles, namely a level bubble A, a level bubble B and a level bubble C, which are respectively arranged at the bottom, the middle and the top of the indium steel ruler; the level bubble A, the level bubble B and the level bubble C are all composed of two horizontal bubble bead type level bubbles which are vertically arranged.
5. The gravity-calibrated wind-resistant indium steel ruler according to claim 1, wherein the supporting legs comprise four pieces, two slide ways are arranged on the indium steel ruler, two supporting legs are respectively arranged on the indium steel ruler corresponding to the two channels, the unfolding angle of the supporting legs is controlled by the supporting leg control clamping pieces, the supporting leg control clamping pieces are strip-shaped clamping piece bodies, one ends of the clamping piece bodies are provided with mounting holes for mounting fixing bolts and strip-shaped holes for mounting clamping bolts, the fixing bolts are fixed on one of the supporting legs, the clamping bolts are fixed on the other supporting leg, and the opening and closing angles of the supporting legs are controlled by the change of the positions of the strip-shaped holes of the clamping bolts.
6. The gravity-calibrated wind-resistant indium steel ruler according to claim 1, wherein each supporting leg is formed by overlapping and sleeving two square tubes with different cross-sectional areas, the upper square tube is a support leg, the lower square tube is a telescopic leg, eight steel balls are arranged in the telescopic leg locking mechanism, four steel balls are arranged at the lower part of the support leg, and the other four steel balls are arranged at the upper part of the telescopic leg.
7. The gravity-calibrated wind-resistant indium steel ruler according to claim 1 or 6, wherein the bottom end of the supporting leg is provided with a detachable travelling wheel, and a rubber layer is adhered to the outer side of the travelling wheel.
8. The gravity-calibrated wind-resistant indium steel ruler according to claim 1, wherein the supporting legs are coated with yellow paint with a light reflection recognition function, and aluminum powder is added into the paint.
9. The gravity-calibrated wind-resistant indium steel ruler according to claim 1, further comprising a traveling wheel locking mechanism, wherein the traveling wheel locking mechanism comprises a lock nut arranged above the traveling wheel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220536498.3U CN216791177U (en) | 2022-03-10 | 2022-03-10 | Gravity calibration type wind-resistant indium steel ruler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220536498.3U CN216791177U (en) | 2022-03-10 | 2022-03-10 | Gravity calibration type wind-resistant indium steel ruler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216791177U true CN216791177U (en) | 2022-06-21 |
Family
ID=82000194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220536498.3U Expired - Fee Related CN216791177U (en) | 2022-03-10 | 2022-03-10 | Gravity calibration type wind-resistant indium steel ruler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216791177U (en) |
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2022
- 2022-03-10 CN CN202220536498.3U patent/CN216791177U/en not_active Expired - Fee Related
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Granted publication date: 20220621 |