CN210370651U - Novel cutter head of shield tunneling machine - Google Patents
Novel cutter head of shield tunneling machine Download PDFInfo
- Publication number
- CN210370651U CN210370651U CN201921114118.1U CN201921114118U CN210370651U CN 210370651 U CN210370651 U CN 210370651U CN 201921114118 U CN201921114118 U CN 201921114118U CN 210370651 U CN210370651 U CN 210370651U
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- cutterhead
- center
- panel
- cutter
- cutter head
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- 230000005641 tunneling Effects 0.000 title claims description 35
- 239000002689 soil Substances 0.000 abstract description 22
- 239000011435 rock Substances 0.000 description 9
- 239000004927 clay Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000002337 anti-port Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The utility model relates to a novel shield constructs quick-witted blade disc, this blade disc panel are the circular structure that 4 spokes and 8 radials are constituteed. The spoke plate is provided with a cutter and a disc cutter, the spoke plate is provided with a serrated knife, a double-edged hob and a profiling knife, the distances between the adjacent double-edged hobs are the same, the serrated knife is arranged at the center of the cutter head panel, and a row of serrated knives are arranged in a gradient manner from the center of the cutter head panel to the edge of the cutter head panel. The center of the cutter head panel is provided with an opening which is matched with openings among all the radial plates and between the spokes, so that a larger opening ratio can be achieved. The utility model discloses can effectively solve the problem of cutter head panel center caking mud cake, improve the mobility of the cutting soil body, promote the tunnelling efficiency of shield structure machine.
Description
Technical Field
The utility model relates to a shield constructs quick-witted blade disc, in particular to novel shield constructs quick-witted blade disc.
Background
A shield machine is a tunnel boring machine using a shield method. The shield machine has very large market demands in the aspects of municipal construction, national defense construction and the like in China.
In the actual engineering, when the shield tunneling machine excavates the clay, silty clay, mudstone and other strata, the clay is very easy to adhere to the surface of the cutter head and is not cleaned in time, the cutter head is easy to be stuck, a thick mud cake is formed on the surface of the cutter head, the cutter head is forced to lose the excavation capacity, the penetration degree is greatly reduced, and the shield tunneling efficiency is seriously influenced. In the prior art, aiming at the problem that a cutter head is stuck with mud cakes, liquid such as a foaming agent and a dispersing agent is injected to soak the cutter head of the mud cakes, then the cutter head is rotated at a high speed, and the mud cakes are thrown away through centrifugal force or manually cleaned. These methods are long in time consumption and complex in operation, and cannot fundamentally solve the problem of mud cake formation.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: the utility model provides a novel shield constructs quick-witted blade disc, this blade disc is through setting up the serrated knife that the toper was arranged at the blade disc center to and great aperture opening rate, can solve the problem of blade disc center mud cake effectively, reduce manual operation, promote construction speed.
In order to achieve the above object, the utility model adopts the following technical scheme:
the embodiment of the utility model provides a novel shield constructs quick-witted blade disc, this shield construct the structure of quick-witted blade disc be the circular structure that has 4 spokes and 8 radials, is provided with one row of serrated knife at the blade disc center of shield structure machine, and the serrated knife sets up to blade disc panel edge direction gradient from blade disc panel center. The spoke is provided with a plurality of disc cutters, profiling cutters are arranged at two ends of the spoke, cutters are arranged at two sides of the web plate, and the disc cutters are arranged at the edge of each web plate.
Optionally, an opening is formed in the position, close to the center, of the cutter head of the shield tunneling machine, an opening is formed between each spoke and each spoke plate, and an opening is formed between each spoke plate.
The shield machine cutter head is characterized in that an opening is formed in the center of the shield machine cutter head, openings are formed between the radial plates and the spokes, and therefore the opening rate of the surface of the shield machine cutter head can be increased, the higher opening rate can be more beneficial to flowing of muck, the muck can be rapidly transported away, and the excavating efficiency is improved.
Optionally, the number of the cutters on each side of the radial plate is 3, and the cutters in each row on the radial plate are all located on the same circle with the circle center at the center of the cutter head.
Specifically, through radials bilateral symmetry installation cutter, the blade disc is positive and the function is excavated all can be realized to the antiport, can protect the cutter of one-way cutting function moreover, improves the bearing capacity of spoke.
Optionally, the serrated knives are all higher than the surface of the cutter head, and the serrated knives are symmetrically distributed.
Specifically, the serrated knives in the center of the cutter head are symmetrically distributed about the central axis of the cutter head, the cutting surfaces of the serrated knives in the central part are most protruded and sequentially reduced from the center to the edge, and the cutting surfaces of the serrated knives are all higher than the plane of the cutter head.
Optionally, the number of the double-edged hobs on the spoke is 6, and the distance between every two adjacent double-edged hobs is consistent.
Specifically, evenly set up 6 twolip hobbing cutters on the spoke, can carry out effectual excavation to the face, and adopt twolip hobbing cutter can work in the stereoplasm soil layer.
Optionally, the disc cutter arranged at the edge of the web is a single-blade cutter.
Specifically, the disc cutters are arranged at the edges of the radial plates and used for excavating hard soil layers appearing at the edges of the cutter head, so that the cutter head can adapt to more complex geology.
Optionally, a wear-resistant plate is arranged on one side of the single-edge hob close to the center of the cutter head panel, and the wear-resistant plate does not exceed the surface of the cutting edge of the cutter.
Specifically, the single-edge hob edge face arranged on the web edge is not in the plane of the cutterhead panel, and the wear-resisting plate is arranged on one side, close to the center of the cutterhead, of the single-edge hob, so that the abrasion of the hob edge can be reduced.
Optionally, the hob and the cutter are both arranged on the plane of the face plate of the cutter disc, the plane of the cutting edge of the hob is higher than that of the cutting edge of the cutter, and the plane of the cutting edge of the hob is lower than that of the cutting edge of the gear cutter arranged at the center of the cutter disc.
Specifically, the serrated knife cutting edge plane of central point position is the highest, and is the ladder distribution, can prevent that the blade disc central point from putting the mud cake phenomenon of appearing, and hobbing cutter cutting edge face is higher than cutter cutting edge face, can touch the face earlier, can prevent that the cutter from collapsing when meetting stereoplasm soil layer.
Optionally, the serrated knife at the center of the cutterhead panel is separately installed and can be replaced.
Specifically, every serrated knife at shield constructs machine knife disc panel center all is independently installed, and every serrated knife all can be changed, when meetting wearing and tearing seriously, need not change whole blade disc center cutter, can save time, reduces extravagantly.
The utility model has the advantages that:
1. compared with the prior art, the novel shield machine cutterhead is distributed through the tooth cutters in the central stepped shape of the cutterhead, so that mud cakes in the center of the cutterhead of the shield machine can be effectively prevented, manual operation is reduced, and excavating efficiency is improved.
2. The novel cutter head of the shield machine can obtain a larger opening rate through the arrangement of 4 spokes and 8 radial plates and the mode of opening the center of the cutter head of the shield machine, so that muck can enter the shield machine quickly and the transportation speed is increased.
3. The novel shield tunneling machine cutter head can adapt to a complex soil layer through the cooperation work of the hobbing cutter and the replaceable tooth cutter, and the working range is improved to some extent.
Drawings
Fig. 1 is a schematic structural diagram of a cutter head of the novel shield tunneling machine provided by the present invention;
fig. 2 is the utility model provides a profile structure schematic diagram of novel shield constructs quick-witted blade disc.
In the figure, 1, a novel shield tunneling machine cutterhead; 10. spokes; 11. a web; 12. a cutter head panel; 101. a toothed cutter; 102. a double-edged hob; 103. a profiling cutter; 111. a cutter; 112. a disc cutter; 113. wear plates.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "first", "second", "third", etc. are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
The terms "upper", "lower", "left", "right", "inner", "outer", and the like refer to orientations or positional relationships based on the drawings, or the orientations or positional relationships that are conventionally used to place the products of the present invention, and are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "vertical" and the like do not require absolute perpendicularity between the components, but may be slightly inclined. Such as "vertical" merely means that the direction is relatively more vertical and does not mean that the structure must be perfectly vertical, but may be slightly inclined.
In the description of the present invention, it is also to be understood that the terms "disposed," "mounted," "connected," and the like are intended to be construed broadly unless otherwise specifically indicated and limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
Fig. 1 shows a novel shield tunneling machine cutterhead 1, the structure of the shield tunneling machine cutterhead is a circular structure with 4 spokes 10 and 8 radial plates 11, the spokes 10 and the radial plates 11 are uniformly distributed around the center of a cutterhead panel 12, a row of toothed cutters 101 are arranged at the center of the shield tunneling machine cutterhead, the toothed cutters 101 are arranged in a gradient descending manner from the center of the cutterhead panel 12 to the edge direction of the cutterhead panel 12, a plurality of double-edge hobs 102 are arranged on the spokes 10, a profiling cutter 103 is arranged at one end, close to the edge of the cutterhead panel 12, of each spoke 10, cutters 111 are arranged on two sides of each radial plate 11, and a disc-shaped hob 112 is arranged at.
As shown in FIG. 1, 4 spokes 10 and 8 radial plates 11 of the cutter head of the shield tunneling machine are distributed around the center of the cutter head in a central mode, and the widths of the spokes 10 and the widths of the radial plates 11 are basically the same.
It should be noted that the shield tunneling machine cutterhead is provided with 4 spokes 10 and 8 radial plates 11, and the width of the spokes is consistent, so that a cutterhead panel 12 with a symmetrical center can be formed, the bearing capacity of the shield tunneling machine cutterhead can be improved, and the service life of the shield tunneling machine cutterhead can be prolonged.
As shown in fig. 1, 4 spokes 10 are connected into a cross shape, a row of serrated knives 101 are arranged at the joints of the spokes 10 of the shield machine cutter head, the serrated knives 101 are symmetrically arranged along the center line of the shield machine cutter head, and the serrated knives 101 are arranged in a gradient manner from the center of the cutter head panel 12 to the edge direction of the cutter head.
It should be noted that when the shield tunneling machine passes through a cohesive soil layer, mud cakes are easily formed in the central area of the cutter head and the central area of the soil cabin, the mud cakes in the central area of the soil cabin can cause the rotation load of the cutter head to be increased, even stop rotating, and the hob can not be broken when facing a softer soil layer. Therefore, the toothed cutters 101 arranged in a ladder manner are arranged at the center of the cutterhead panel 12, and the toothed cutters 101 can normally work in a soft soil layer to carry out crushing and tunneling.
The gear cutter 101 is arranged in the center of the cutter head panel 12 in a gradient reducing mode, the shield machine can cut soil in two steps, the gear cutter 101 in the center is used for cutting the soil with a small circular section in the center part firstly, then the soil is cut with a full section, meanwhile, the soil cut by the gear cutter 101 when the cutter head rotates is added with a turning motion on the basis of tangential and radial motion, the mobility of the cut soil can be improved, the problem of mud cake is solved, and the whole tunneling level of the shield machine is greatly improved.
As shown in fig. 1, 3 double-edged roller cutters 102 are provided at regular intervals on each spoke 10, and the cutting edge plane of the double-edged roller cutters 102 is lower than the cutting edge plane of the tooth cutter 101 at the center of the cutter deck panel 12.
It should be noted that the double-edged hob 102 are uniformly arranged on the spoke 10 at intervals, so that the tunneling of the cutter head of the shield tunneling machine can be more uniform, the hob can cut hard rock strata, the disc hob 112 mounted on the cutter head is tightly pressed on the rock surface under the action of the jack, and along with the rotation of the cutter head, the disc hob 112 revolves around the center of the cutter head and simultaneously rotates around the axis of the disc. The face plate 12 of the cutterhead can be used for hard rock work, in which the hob cuts a series of concentric grooves in the face of the rock under the thrust and torque of the cutterhead, and when the thrust exceeds the strength of the rock, the rock under the cutting edge of the double-edged hob 102 is directly crushed.
As shown in fig. 1, a telescopic profiling knife 103 is arranged at the edge of the spoke 10 close to the shield machine cutterhead panel 12.
It should be noted that the maximum value of the extension of the profiling cutter 103 is 100mm, when the shield tunneling machine advances, turns or corrects the position in a curve section, the required space is created by overexcavating and cutting the soil body through the profiling cutter 103, and the shield tunneling machine is ensured to realize curve advancing, smooth turning and correction under the conditions of less overexcavation and small interference to the surrounding soil body.
As shown in FIG. 1, an opening is arranged at the center of a cutter head panel 12 of the shield machine, a circular ring is formed at the center of the cutter head panel 12, a spoke plate 11 is connected to the circular ring, and one end of the spoke plate 11, which is close to the edge of the cutter head panel 12, is wider.
It should be noted that the center of the cutter head panel 12 of the shield tunneling machine is provided with an opening, and the openings between the radial plates 11 and the spokes 10 greatly increase the opening rate of the cutter head panel 12, and the larger opening rate can increase the flow speed of the muck and improve the tunneling efficiency.
As shown in fig. 1, 3 cutters 111 are symmetrically arranged on the web 11, and the cutting edge plane of the cutters 111 is lower than that of the double-edged hob 102.
It should be noted that the cutters 111 can only cut in one direction, and the shield needs to rotate forward and backward, so the symmetrical arrangement of the cutters 111 not only can realize the function of the cutters 111 in both directions of rotation, but also can protect the corresponding cutters 111. The cutting edge plane of the cutter 111 is lower than that of the hob, so that the hob can cut firstly, the cutter 111 cannot be broken when hard rock strata are met, cutting can be achieved when the soil layer is softer, and the working range of the cutter head of the shield tunneling machine is enlarged.
As shown in fig. 1, the web 11 is provided with a single-edged hob near the edge of the cutterhead panel 12, and the single-edged hob is provided with a wear plate 113 near the center of the cutterhead panel 12, the wear plate 113 not exceeding the cutting edge plane of the cutters 111.
It should be noted that the single-edge hob is arranged at the edge of the cutterhead panel 12 of the radial plate 11, so that the edge of the cutterhead panel 12 can be cut, and when the cutterhead panel encounters a hard soil layer, other cutters can be protected. The provision of the wear plate 113 protects the single-edged hob since the plane of the edge of the hob is not parallel to the cutterhead panel 12.
The working principle is as follows: the shield machine is driven by a hydraulic motor of a central shaft to enable a shield machine cutterhead panel 12 to rotate, a plurality of cutting tools are arranged on the shield machine cutterhead panel 12, a serrated knife 101 in the center of the cutterhead panel 12 firstly contacts with a tunnel face, the serrated knife 101 cuts a small circular section in the center, and the arrangement of gradient reduction can prevent mud cakes. Then the double-edged hob 102 on the spoke 10 starts to contact the tunnel face, the hob cuts a series of concentric circular grooves on the tunnel face, when the thrust exceeds the strength of the rock, the rock under the cutting edge of the double-edged hob 102 is directly crushed, then the cutter 111 on the web plate 11 contacts the tunnel face to cut the soil mass, and finally the soil mass cut by each cutter enters the shield machine through the opening arranged on the cutter disc and is transported away.
To sum up, the utility model provides a novel shield constructs quick-witted blade disc 1, this blade disc structure can effectively solve the problem that the blade disc center knot mud cake through the echelonment range of blade disc center serrated knife 101, and the cooperation work of arranging of various cutters can adapt to comparatively complicated soil layer simultaneously, enlarges the action scope that the shield constructs the machine.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a novel shield constructs quick-witted blade disc which characterized in that: the structure of the shield tunneling machine cutterhead is a circular structure with 4 spokes (10) and 8 radial plates (11), the shield tunneling machine cutterhead comprises a cutterhead panel (12), and the spokes (10) and the radial plates (11) are uniformly distributed around the center of the cutterhead panel (12);
a row of toothed cutters (101) are arranged in the center of the shield machine cutterhead, and the toothed cutters (101) are arranged in a gradient manner from the center of the cutterhead panel (12) to the edge direction of the cutterhead panel (12);
a plurality of double-edged hobs (102) are arranged on the spokes (10), and a profiling cutter (103) is arranged at one end, close to the edge of the cutter head panel (12), of each spoke (10);
cutters (111) are arranged on two sides of the radial plate (11), and a disc cutter (112) is arranged on the edge of each radial plate (11) close to the cutter head panel (12).
2. The novel shield tunneling machine cutterhead according to claim 1, wherein an opening is provided near the center of the cutterhead, an opening is provided between the spoke (10) and the spoke plate (11), and an opening is provided between each adjacent spoke plate (11).
3. The novel shield tunneling machine cutterhead according to claim 1, wherein the number of the cutters (111) on each side of the web (11) is 3, and each row of cutters (111) on the web (11) is located on the same circle with the center of the circle at the center of the cutterhead.
4. The novel shield tunneling machine cutterhead according to claim 1, wherein the serrated knives (101) are all higher than the surface of the cutterhead, and the serrated knives (101) are symmetrically distributed.
5. The novel shield tunneling machine cutterhead according to claim 1, wherein the number of the double-edged hobs (102) arranged on the spoke (10) is 6, and the distance between the adjacent double-edged hobs (102) is consistent.
6. The novel shield tunneling machine cutterhead according to claim 1, wherein the disc cutters (112) provided at the edge of the web (11) are single-edged cutters.
7. The novel shield tunneling machine cutterhead according to claim 6, wherein the single-edged hob is provided with a wear plate (113) near the center of the cutterhead panel (12), the wear plate (113) does not extend beyond the cutting edge surface of the cutting knife (111).
8. The novel shield tunneling machine cutterhead according to claim 1, wherein the double-edged hob (102) and the cutter (111) are both disposed on the cutterhead panel (12) plane, and the cutting edge plane of the double-edged hob (102) is higher than the cutting edge plane of the cutter (111), and the cutting edge plane of the double-edged hob (102) is lower than the cutting edge plane of the serrated knife (101) in the cutterhead center position.
9. The novel shield tunneling machine cutterhead according to claim 1, wherein the serrated knife (101) in the center of the cutterhead panel (12) is installed separately, and the serrated knife (101) is replaceable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921114118.1U CN210370651U (en) | 2019-07-16 | 2019-07-16 | Novel cutter head of shield tunneling machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921114118.1U CN210370651U (en) | 2019-07-16 | 2019-07-16 | Novel cutter head of shield tunneling machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210370651U true CN210370651U (en) | 2020-04-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921114118.1U Expired - Fee Related CN210370651U (en) | 2019-07-16 | 2019-07-16 | Novel cutter head of shield tunneling machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210370651U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065419A (en) * | 2020-09-30 | 2020-12-11 | 中国铁建重工集团股份有限公司 | TBM cutter head and inclined shaft construction method |
| CN112360494A (en) * | 2020-11-12 | 2021-02-12 | 安徽唐兴机械装备有限公司 | Turning-folding type pipe jacking machine cutter head |
| CN112377202A (en) * | 2020-11-11 | 2021-02-19 | 安徽唐兴机械装备有限公司 | Middle rolling type pipe jacking machine cutter head |
| CN114165249A (en) * | 2021-12-08 | 2022-03-11 | 北京市市政四建设工程有限责任公司 | Muddy water and soil pressure double-mode shield tunneling machine cutter head suitable for complex stratum |
| CN115355012A (en) * | 2022-08-11 | 2022-11-18 | 中交二公局第三工程有限公司 | Cutter head structure for preventing cutter head of shield tunneling machine from caking mud cake and using method thereof |
-
2019
- 2019-07-16 CN CN201921114118.1U patent/CN210370651U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112065419A (en) * | 2020-09-30 | 2020-12-11 | 中国铁建重工集团股份有限公司 | TBM cutter head and inclined shaft construction method |
| CN112065419B (en) * | 2020-09-30 | 2022-11-25 | 中国铁建重工集团股份有限公司 | TBM cutter head and inclined shaft construction method |
| CN112377202A (en) * | 2020-11-11 | 2021-02-19 | 安徽唐兴机械装备有限公司 | Middle rolling type pipe jacking machine cutter head |
| CN112377202B (en) * | 2020-11-11 | 2022-11-22 | 安徽唐兴装备科技股份有限公司 | Middle rolling type pipe jacking machine cutter head |
| CN112360494A (en) * | 2020-11-12 | 2021-02-12 | 安徽唐兴机械装备有限公司 | Turning-folding type pipe jacking machine cutter head |
| CN112360494B (en) * | 2020-11-12 | 2022-12-27 | 安徽唐兴装备科技股份有限公司 | Turning-folding type pipe jacking machine cutter head |
| CN114165249A (en) * | 2021-12-08 | 2022-03-11 | 北京市市政四建设工程有限责任公司 | Muddy water and soil pressure double-mode shield tunneling machine cutter head suitable for complex stratum |
| CN115355012A (en) * | 2022-08-11 | 2022-11-18 | 中交二公局第三工程有限公司 | Cutter head structure for preventing cutter head of shield tunneling machine from caking mud cake and using method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200421 |