CN109668756B - Engineering is managed with powder sample ration collection system - Google Patents
Engineering is managed with powder sample ration collection system Download PDFInfo
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- CN109668756B CN109668756B CN201910104121.3A CN201910104121A CN109668756B CN 109668756 B CN109668756 B CN 109668756B CN 201910104121 A CN201910104121 A CN 201910104121A CN 109668756 B CN109668756 B CN 109668756B
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- pointed cone
- sampling
- groove
- upper half
- pull rod
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
Abstract
The invention discloses a quantitative acquisition method and an acquisition device for a powder sample for engineering supervision, wherein the device comprises a sampling cylinder and a pointed cone, and the pointed cone is arranged at the front end of the sampling cylinder; the sampling cylinder comprises an upper half part and a lower half part, the pointed cone comprises an upper pointed cone and a lower pointed cone, the lower pointed cone is integrally connected with the lower half part, a stop block extending along the axial direction of the sampling cylinder is arranged on the inner wall of the lower half part, and a sampling groove is formed between the lower pointed cone and the stop block; the rear end of the sampling tube is provided with a mounting seat, one side of the upper half pointed cone facing the mounting seat is connected with a sliding part with the length larger than that of the sampling groove, the lower surface of the sliding part is abutted against the upper surface of the stop block, the sliding part is connected with a pull rod extending out of the mounting seat, and the upper half pointed cone and the sliding part are connected to the upper half part in a sliding manner through the pull rod; the pull rod is provided with a limiting block outside the sampling cylinder, and the limiting block is abutted against the mounting seat when the upper half pointed cone slides to be completely attached to the lower half pointed cone. The invention can carry out rapid quantitative sampling on the bagged cement, and has small error.
Description
Technical Field
The invention relates to the technical field of engineering supervision detection, in particular to a quantitative acquisition method and device for a powder sample for engineering supervision.
Background
The cement sample collection is an important supervision work in engineering supervision, according to relevant technical standards and regulations in China, cement samples with the same number are collected according to the same manufacturer, the same grade, the same variety and the same batch number, cement which enters a field continuously is collected, 200t in bags is not more than one batch, 500t in bulk is not more than one batch, each batch is sampled not less than once, the samples are representative and can be continuously taken, and the same amount of samples can be extracted from more than 20 different parts, and the total amount is at least 12 kg.
The prior art, granted publication No. CN206772631U, discloses a bagged cement sampler for engineering supervision, which comprises a tip, a sampler body and a sampler body, wherein the tip is positioned at the foremost end of the sampler body and comprises a conical top facing the front of the sampler body and a conical bottom facing the inside of the sampler body; the sampling cylinder is a hollow cylinder which is coaxially arranged on the conical bottom surface of the pointed end, and the side surface of the sampling cylinder is provided with a sampling port for cement to enter; the sealing plate is attached to the inner wall of the sampling cylinder and is blocked on the sampling port.
The above prior art solutions have the following drawbacks: after the sampling cylinder is inserted into the bagged cement, the cement powder falls into the sampling opening mainly by self weight. Because the cement of job site is all piled up and is placed usually, under the pressure of other bagged cement, the cement is in by the state of being compacted basically, and the air gap between the cement powder is less, and mobility is poor, has mutual adhesion phenomenon, and is the same with the principle that the feed bin was beaten the arch, because above-mentioned factor, the cement powder is difficult to flow into the sampling tube smoothly, and the problem that directly leads to is just that the sampling process is slow, needs artifical patting to beat in order to loosen the cement powder. In addition, the cement powder flows into the sampling port by self weight, and whether the sampling cylinder is just filled with the cement powder or not can not be determined when sampling is carried out each time, so that the equal amount of samples taken each time is difficult to ensure. The above problems are all overcome by the cement sampling work in the engineering supervision process.
Disclosure of Invention
The invention aims to provide a quantitative powder sample collecting device for engineering supervision, which can be used for quickly and quantitatively sampling bagged cement and has small error.
The above object of the present invention is achieved by the following technical solutions:
a quantitative powder sample collecting device for engineering supervision comprises a sampling cylinder and a pointed cone, wherein the pointed cone is arranged at the front end of the sampling cylinder; the sampling cylinder comprises an upper half part and a lower half part, the pointed cone comprises an upper pointed cone and a lower pointed cone, the lower pointed cone is integrally connected with the lower half part, a stop block extending along the axial direction of the sampling cylinder is arranged on the inner wall of the lower half part, and a sampling groove is formed between the lower pointed cone and the stop block; the rear end of the sampling tube is provided with a mounting seat, one side of the upper half pointed cone facing the mounting seat is connected with a sliding part with the length larger than that of the sampling groove, the lower surface of the sliding part is abutted against the upper surface of the stop block, the sliding part is connected with a pull rod extending out of the mounting seat, and the upper half pointed cone and the sliding part are connected to the upper half part in a sliding mode through the pull rod; and the pull rod is provided with a limiting block outside the sampling cylinder, wherein the limiting block is used for forming collision with the mounting seat when the upper half pointed cone slides to be completely attached to the lower half pointed cone.
Through adopting above-mentioned technical scheme, when taking a sample, puncture the cement bag through the pointed cone earlier, insert the sampler barrel in the cement bag, then through pull rod pulling first pointed cone and sliding part to the rear end for the most advanced of first pointed cone slides to the rear of sample groove, and when the sliding part slides, the dog can support the sliding part, makes the difficult skew of sliding track of sliding part. Then in the process of pushing the sampling cylinder forwards, the cement powder at the front end of the upper half part can quickly enter the upper half part and fall into the sampling groove because the front end of the upper half part is not blocked by the upper half pointed cone, and in the process of continuously pushing the sampling cylinder forwards, the cement powder at the front end of the upper half part is continuously extruded into the upper half part and is filled in the upper half part, and at the moment, the cement powder in the sampling groove is also compacted. And then the rod is pushed and pulled forwards, so that the upper half pointed cone and the sliding part slide back to the original positions, the excess cement powder above the sampling groove is pushed out of the upper half part, the quantitative cement powder is obtained in the sampling groove, and finally the sampling cylinder is pulled out of the cement bag. When this scheme of adoption is taken a sample to bagged water mud, not only can fill up the sample groove fast, when taking a sample at every turn moreover, the cement powder weight that obtains in the sample groove is all about as much, and the error is less.
The invention is further configured to: the front end face of the sampling tube is a conical surface, and the conical surface is connected with the side wall of the pointed cone.
Through adopting above-mentioned technical scheme, when the cement bag was punctureed to the pointed cone, because the front end of sampling tube is the conical surface and links up with the pointed cone lateral wall for the sampling tube can insert the cement bag smoothly in the bag.
The invention is further configured to: the position threaded connection that the mount pad corresponds the latter half has the regulation pole, adjust the one end and the dog swivelling joint of pole in the sampler barrel, dog sliding connection is in the latter half.
Through adopting above-mentioned technical scheme, because dog sliding connection in the latter half, adjust the pole through rotating and can drive the dog and slide in the latter half to can adjust the volume in sample groove, application scope is wider.
The invention is further configured to: the bearing is installed on the stop block, the outer ring of the bearing is fixedly connected with the stop block, and the inner ring of the bearing is fixedly connected with the adjusting rod.
Through adopting above-mentioned technical scheme for adjust the pole and can swivelling joint on the dog.
The invention is further configured to: the positioning mechanism comprises a mounting groove arranged on the upper surface of the stop block, a spring is mounted at the bottom of the mounting groove, the spring is supported and connected with a steel ball, a limiting plate is arranged at an opening of the mounting groove, and the limiting plate is provided with a through hole through which only a part, smaller than the hemisphere, of the steel ball extends out of the upper surface of the stop block; the lower surface of the sliding part is provided with a positioning groove matched with the steel ball; the distance from the axis of the through hole to the sampling groove is greater than the distance from the axis of the positioning groove to the tip of the upper half pointed cone; the pull rod is rotatably connected to the sliding portion, a locking plate is fixedly connected to the pull rod, a locking groove matched with the locking plate is formed in the upper surface of the stop block, and when the steel balls are clamped with the positioning grooves, the locking plate can be clamped with the locking groove along with the rotation of the pull rod.
Through adopting above-mentioned technical scheme, when promoting the sampling tube forward, can fix the position of half awl and sliding part on the top. Specifically, when the pull rod is pulled to the rear end, the sliding part abuts against the stop block to slide, and when the positioning groove slides to the upper part of the ball along with the sliding part, the ball is embedded into the positioning groove under the action of the spring. Because under the ball initial condition, have and be less than hemisphere partial extension department through-hole, consequently will make constant head tank and ball gomphosis, need overcome certain resistance when the pulling pull rod to be convenient for judge whether the ball has already with the constant head tank joint. When the positioning groove is clamped with the ball, the locking plate can be rotated into the locking groove by rotating the pull rod, so that the axial positions of the upper half pointed cone and the sliding part are fixed. When the sampling cylinder is pushed forwards, the upper half pointed cone and the sliding part cannot move backwards under the pressure of the cement powder, so that the pressure of the cement powder entering the upper half part acts on the sampling groove instead, and the cement powder in the sampling groove is compacted more quickly. In addition, the distance from the axis of the through hole to the sampling groove is greater than the distance from the axis of the positioning groove to the tip of the upper half pointed cone, so that when the locking plate is clamped with the locking groove, the tip of the upper half pointed cone slides to the rear of the sampling groove. And because the ball is installed on the dog, even the dog cunning moves to different positions, when ball and constant head tank gomphosis, still can guarantee that the pointed end of first half awl has slided to the rear of sample groove.
The invention is further configured to: and the edge of the rear end of the sampling tube is provided with a flange.
Through adopting above-mentioned technical scheme, be convenient for insert or extract the cement bag with the help of the turn-ups with the sampling tube.
The invention also aims to provide a quantitative collecting method of a powder sample for engineering supervision, which comprises the quantitative collecting device of the powder sample for engineering supervision, and comprises the following steps:
the method comprises the following steps: under the condition that the upper half pointed cone is attached to the lower half pointed cone, the pointed cone punctures the cement bag, and the sampling cylinder is inserted into the cement bag;
step two: pulling the pull rod to the rear end to enable the upper half pointed cone and the sliding part to slide to the rear end until the tip of the upper half pointed cone slides to the rear of the sampling groove;
step three: continuously pushing the sampling cylinder into the cement bag to enable cement powder to enter the upper half part from the opening at the front end of the upper half part and fall into the sampling groove, and finally filling the sampling groove and the upper part of the sampling groove;
step four: the pull rod is pushed forwards independently, the upper half pointed cone pushes the redundant cement powder above the sampling groove out of the upper half part, and the quantitative sampling of the cement powder is completed when the upper half pointed cone and the lower half pointed cone are attached again;
step five: and pulling the sampling cylinder out of the cement bag.
Through adopting above-mentioned technical scheme, can be faster get to take a sample the cement powder, and the cement powder weight of obtaining at every turn is more accurate, and the error is less.
Drawings
FIG. 1 is a schematic sectional view of the present embodiment;
FIG. 2 is a schematic cross-sectional view of the upper cone of the present embodiment sliding to the rear of the sampling slot;
fig. 3 is an enlarged schematic view at a in fig. 2.
Description of reference numerals: 1. a sampling tube; 2. a pointed cone; 3. an upper half; 4. a lower half; 5. an upper half pointed cone; 6. a lower half pointed cone; 7. a stopper; 8. a sampling groove; 9. a mounting seat; 10. a sliding part; 11. a bearing; 12. a pull rod; 13. a limiting block; 14. mounting grooves; 15. a spring; 16. steel balls; 17. a limiting plate; 18. positioning a groove; 19. a locking plate; 20. locking the groove; 21. a conical surface; 22. flanging; 23. and adjusting the rod.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example (b):
a powder sample quantitative acquisition device for engineering supervision is shown in figure 1 and comprises a cylindrical sampling cylinder 1 and a pointed cone 2, wherein the pointed cone 2 is arranged at the front end of the sampling cylinder 1; the sampling tube 1 comprises an upper half part 3 and a lower half part 4, wherein the upper half part 3 and the lower half part 4 are equally divided; the pointed cone 2 comprises an upper half pointed cone 5 and a lower half pointed cone 6, the lower half pointed cone 6 is integrally connected with the lower half portion 4, a stop block 7 extending along the axial direction of the sampling cylinder 1 is arranged on the inner wall of the lower half portion 4, and a sampling groove 8 is formed between the lower half pointed cone 6 and the stop block 7; the rear end of the sampling tube 1 is fixedly connected with a mounting seat 9, one side of the upper half-cone 5 facing the mounting seat 9 is connected with a sliding part 10 with the length larger than that of the sampling groove 8, and the lower surface of the sliding part 10 is abutted to the upper surface of the stop block 7.
As shown in fig. 1 and 3, a pull rod 12 is connected to a side of the sliding portion 10 facing the mounting seat 9 through a bearing 11, wherein an outer ring of the bearing 11 is fixedly connected to the sliding portion 10, and an inner ring of the bearing 11 is in interference connection with the pull rod 12. The pull rod 12 extends out of the mounting seat 9, the pull rod 12 is in sliding connection with the mounting seat 9, the pull rod 12 is a round rod, and the pull rod 12 can rotate. The upper half pointed cone 5 and the sliding part 10 can slide in the upper half part 3 of the sampling tube 1 by pushing and pulling the pull rod 12, and the pull rod 12 is provided with a limiting block 13 outside the sampling tube 1, which is abutted against the mounting seat 9 when the upper half pointed cone 5 slides to be completely attached to the lower half pointed cone 6.
As shown in fig. 2 and 3, a positioning mechanism is arranged on the upper surface of the stopper 7, the positioning mechanism includes a mounting groove 14 arranged on the upper surface of the stopper 7, a spring 15 is mounted at the bottom of the mounting groove 14, a steel ball 16 is supported and connected on the spring 15, a limiting plate 17 is fixedly connected at an opening of the mounting groove 14, and the limiting plate 17 is provided with a through hole through which only a part of the steel ball 16, which is smaller than a hemisphere, extends out of the upper surface of; the lower surface of the sliding part 10 is provided with a positioning groove 18 matched with the steel ball 16; the distance from the axis of the through hole to the sampling groove 8 is greater than the distance from the axis of the positioning groove 18 to the tip of the upper half pointed cone 5; the pull rod 12 is fixedly connected with a locking plate 19, the upper surface of the stop 7 is provided with a locking groove 20 matched with the locking plate 19, and when the steel balls 16 are clamped with the positioning grooves 18, the locking plate 19 can be clamped with the locking groove 20 along with the rotation of the pull rod 12.
As shown in FIG. 1, the front end surface of the sampling tube 1 is a tapered surface 21, and the tapered surface 21 is engaged with the side wall of the pointed cone 2. The rear end edge of the sampling tube 1 is provided with a flange 22.
A collection method of the powder sample quantitative collection device for project supervision comprises the following steps:
the method comprises the following steps: under the condition that the upper half pointed cone 5 is attached to the lower half pointed cone 6, the pointed cone 2 punctures the cement bag, and the sampling tube 1 is inserted into the cement bag.
Step two: pulling the pull rod 12 to the rear end to make the upper half-tip cone 5 and the sliding part 10 slide to the rear end until the tip of the upper half-tip cone 5 slides to the rear of the sampling groove 8; when the detent groove 18 slides above the balls with the slide 10, the balls are fitted into the detent groove 18 by the spring 15. The pull rod 12 is then rotated so that the locking plate 19 is rotated into the locking slot 20, thereby fixing the axial position of the upper half-cone 5 and the sliding part 10.
Step three: continuously pushing the sampling cylinder 1 into the cement bag, so that cement powder enters the upper half part 3 from an opening at the front end of the upper half part 3 and falls into the sampling groove 8, and finally filling the sampling groove 8 and the upper part of the sampling groove 8; the cement powder at the front end of the upper half part 3 can rapidly enter the upper half part 3 because the front end of the upper half part 3 is not blocked by the upper half cone 5, and the cement powder at the front end of the upper half part 3 is continuously extruded into the upper half part 3 and is filled in the upper half part 3 in the process that the sampling cylinder 1 is continuously pushed forwards, and at the moment, the cement powder in the sampling groove 8 is also compacted.
Step four: the pull rod 12 is pushed forwards independently, the upper half-tip cone 5 pushes the redundant cement powder above the sampling groove 8 out of the upper half part 3, and the quantitative sampling of the cement powder is completed when the upper half-tip cone 5 and the lower half-tip cone 6 are attached again;
step five: the sampling tube 1 is pulled out of the cement bag.
Preferably, as shown in fig. 2 and 3, the mounting seat 9 is screwed with an adjusting rod 23 at a position corresponding to the lower half portion 4, one end of the adjusting rod 23 in the sampling tube 1 is rotatably connected with the stopper 7 through a bearing 11, the outer ring of the bearing 11 is fixedly connected with the stopper 7, the inner ring of the bearing 11 is fixedly connected with the adjusting rod 23, and the stopper 7 is slidably connected with the lower half portion 4. The stopper 7 can be driven to slide on the lower half portion 4 by rotating the adjusting rod 23, so that the volume of the sampling groove 8 can be adjusted.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (5)
1. A powder sample quantitative collection device for engineering supervision comprises a sampling cylinder (1) and a pointed cone (2), wherein the pointed cone (2) is arranged at the front end of the sampling cylinder (1); the method is characterized in that: the sampling tube (1) comprises an upper half portion (3) and a lower half portion (4), the pointed cone (2) comprises an upper pointed cone (5) and a lower pointed cone (6), the lower pointed cone (6) is integrally connected with the lower half portion (4), a stop block (7) extending along the axial direction of the sampling tube (1) is arranged on the inner wall of the lower half portion (4), and a sampling groove (8) is formed between the lower pointed cone (6) and the stop block (7); the rear end of the sampling tube (1) is provided with a mounting seat (9), one side of the upper half pointed cone (5) facing the mounting seat (9) is connected with a sliding part (10) with the length larger than that of the sampling groove (8), the lower surface of the sliding part (10) is abutted to the upper surface of the stop block (7), the sliding part (10) is connected with a pull rod (12) extending out of the mounting seat (9), and the upper half pointed cone (5) and the sliding part (10) are connected to the upper half part (3) in a sliding mode through the pull rod (12); a limiting block (13) which is arranged outside the sampling cylinder (1) of the pull rod (12) and is abutted against the mounting seat (9) when the upper half pointed cone (5) slides to be completely attached to the lower half pointed cone (6);
the upper surface of the stop block (7) is provided with a positioning mechanism, the positioning mechanism comprises a mounting groove (14) arranged on the upper surface of the stop block (7), the bottom of the mounting groove (14) is provided with a spring (15), the spring (15) is supported and connected with a steel ball (16), an opening of the mounting groove (14) is provided with a limiting plate (17), and the limiting plate (17) is provided with a through hole which only allows the steel ball (16) to be smaller than a hemispherical part and extend out of the upper surface of the stop block (7); the lower surface of the sliding part (10) is provided with a positioning groove (18) matched with the steel ball (16); the distance from the axis of the through hole to the sampling groove (8) is greater than the distance from the axis of the positioning groove (18) to the tip of the upper half pointed cone (5); pull rod (12) swivelling joint in sliding part (10), fixedly connected with jam plate (19) on pull rod (12), dog (7) upper surface is equipped with and is used for locking groove (20) with jam plate (19) complex, and when steel ball (16) and constant head tank (18) looks joint, jam plate (19) can be followed pull rod (12) and rotated and form the joint with locking groove (20).
2. The powder sample quantitative collection device for engineering supervision according to claim 1, characterized in that: the front end face of the sampling tube (1) is a conical surface (21), and the conical surface (21) is connected with the side wall of the pointed cone (2).
3. The powder sample quantitative collection device for engineering supervision according to claim 2, characterized in that: the position threaded connection that mount pad (9) corresponds latter half (4) has regulation pole (23), adjust pole (23) one end and dog (7) swivelling joint in sampler barrel (1), dog (7) sliding connection is in latter half (4).
4. The powder sample quantitative collection device for engineering supervision according to claim 3, characterized in that: the bearing (11) is installed on the stop block (7), the outer ring of the bearing (11) is fixedly connected with the stop block (7), and the inner ring of the bearing (11) is fixedly connected with the adjusting rod (23).
5. The powder sample quantitative collection device for engineering supervision according to claim 4, characterized in that: the rear end edge of the sampling tube (1) is provided with a flanging (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910104121.3A CN109668756B (en) | 2019-01-18 | 2019-01-18 | Engineering is managed with powder sample ration collection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910104121.3A CN109668756B (en) | 2019-01-18 | 2019-01-18 | Engineering is managed with powder sample ration collection system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109668756A CN109668756A (en) | 2019-04-23 |
| CN109668756B true CN109668756B (en) | 2021-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910104121.3A Expired - Fee Related CN109668756B (en) | 2019-01-18 | 2019-01-18 | Engineering is managed with powder sample ration collection system |
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| Country | Link |
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| CN (1) | CN109668756B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155533B (en) * | 2021-04-20 | 2022-11-25 | 济宁市农业科学研究院 | Soybean sampling device and sampling method |
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| CN102425339A (en) * | 2011-11-16 | 2012-04-25 | 宁波瑞奥光电技术有限公司 | Electronic lock capable of being automatically locked |
| CN202420599U (en) * | 2011-05-12 | 2012-09-05 | 彭实 | Push-type quantitative spoon |
| CN206154241U (en) * | 2016-10-25 | 2017-05-10 | 安徽理工大学 | Multi -purpose geological hammer |
| CN206459853U (en) * | 2016-12-28 | 2017-09-01 | 上海长伟锦磁工程塑料有限公司 | A kind of particulate material sampling rod |
| CN206670939U (en) * | 2017-04-25 | 2017-11-24 | 南通四建集团有限公司 | Building building cement sampling detecting device |
| CN206772631U (en) * | 2017-03-20 | 2017-12-19 | 荣华建设集团有限公司 | A kind of project supervision is packed in bag cement sampler |
| CN208333950U (en) * | 2018-06-26 | 2019-01-04 | 河北顺诚工程建设项目管理有限公司 | A kind of project supervision is packed in bag cement sampler |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2854884B1 (en) * | 2003-05-16 | 2006-06-09 | Cogema | DEVICE FOR TAKING POWDERS |
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2019
- 2019-01-18 CN CN201910104121.3A patent/CN109668756B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202420599U (en) * | 2011-05-12 | 2012-09-05 | 彭实 | Push-type quantitative spoon |
| CN102425339A (en) * | 2011-11-16 | 2012-04-25 | 宁波瑞奥光电技术有限公司 | Electronic lock capable of being automatically locked |
| CN206154241U (en) * | 2016-10-25 | 2017-05-10 | 安徽理工大学 | Multi -purpose geological hammer |
| CN206459853U (en) * | 2016-12-28 | 2017-09-01 | 上海长伟锦磁工程塑料有限公司 | A kind of particulate material sampling rod |
| CN206772631U (en) * | 2017-03-20 | 2017-12-19 | 荣华建设集团有限公司 | A kind of project supervision is packed in bag cement sampler |
| CN206670939U (en) * | 2017-04-25 | 2017-11-24 | 南通四建集团有限公司 | Building building cement sampling detecting device |
| CN208333950U (en) * | 2018-06-26 | 2019-01-04 | 河北顺诚工程建设项目管理有限公司 | A kind of project supervision is packed in bag cement sampler |
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| CN109668756A (en) | 2019-04-23 |
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Granted publication date: 20210402 Termination date: 20220118 |