CN217237404U - Automatic screening plant of soil aggregate - Google Patents
Automatic screening plant of soil aggregate Download PDFInfo
- Publication number
- CN217237404U CN217237404U CN202220121738.3U CN202220121738U CN217237404U CN 217237404 U CN217237404 U CN 217237404U CN 202220121738 U CN202220121738 U CN 202220121738U CN 217237404 U CN217237404 U CN 217237404U
- Authority
- CN
- China
- Prior art keywords
- wall
- fixedly connected
- main
- rotating
- barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000012216 screening Methods 0.000 title claims abstract description 30
- 239000002688 soil aggregate Substances 0.000 title claims abstract description 19
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 13
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 13
- 241001330002 Bambuseae Species 0.000 claims abstract description 13
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 13
- 239000011425 bamboo Substances 0.000 claims abstract description 13
- 238000007790 scraping Methods 0.000 claims abstract description 8
- 238000007599 discharging Methods 0.000 claims description 21
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 26
- 230000000694 effects Effects 0.000 abstract description 9
- 241000196324 Embryophyta Species 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 238000007873 sieving Methods 0.000 description 3
- 238000010009 beating Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000004482 other powder Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Combined Means For Separation Of Solids (AREA)
Abstract
The utility model discloses a soil aggregate automatic screening plant, including main section of thick bamboo, play feed cylinder, first rotor plate and master gear, the bottom outer wall fixedly connected with driving motor of main section of thick bamboo, and the bottom inner wall of main section of thick bamboo rotates through the bearing and is connected with the main shaft, a plurality of supports that the top inner wall fixedly connected with equidistance of main section of thick bamboo distributes, fixedly connected with spacing ring between the other end inner wall of support, and the circumference inner wall of spacing ring rotates through the bearing and is connected with the rotatory section of thick bamboo, and the circumference inner wall of rotatory section of thick bamboo is provided with reduction gears, the top outer wall fixedly connected with apron of rotatory section of thick bamboo, and the top outer wall of main shaft rotates through the bearing and connects in the bottom outer wall intermediate position of apron. The utility model discloses a to the multistage screening effect of soil, simple structure, convenient operation, the rotational speed of a rotatory section of thick bamboo is compared in the main shaft, and the rotational speed is comparatively slow to the soil at first filter screen top is scraped at a slow speed in the drive strip of scraping.
Description
Technical Field
The utility model relates to an automatic screening technical field especially relates to an automatic screening plant of soil aggregate.
Background
The sieving is a method for separating group materials according to the particle size, specific gravity, charging property, magnetism and other powder properties, and an operation of dividing a mixed material with different particle sizes into various particle size grades by using a sieve surface with holes is called sieving, and generally used for removing unqualified products or impurity parts in the group materials.
When detecting soil, because can contain more aggregate in the soil, consequently when screening soil, the humidity of soil can be differentiated great existence, and some screening equipment sometimes the condition that the screen cloth blockked up appears in the course of the work, influences the screening progress and shine anti-precision, consequently, need design a soil aggregate automatic screening device to solve above-mentioned problem urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the defects existing in the prior art and providing an automatic screening device for soil aggregates.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an automatic soil aggregate screening device comprises a main barrel, a discharge barrel, a first rotating plate and a main gear, wherein the bottom outer wall of the main barrel is fixedly connected with a driving motor, the bottom inner wall of the main barrel is rotatably connected with a main shaft through a bearing, the top inner wall of the main barrel is fixedly connected with a plurality of supports which are distributed equidistantly, a spacing ring is fixedly connected between the inner walls of the other ends of the supports, the circumferential inner wall of the spacing ring is rotatably connected with a rotary barrel through a bearing, the circumferential inner wall of the rotary barrel is provided with a speed reducing mechanism, the top outer wall of the rotary barrel is fixedly connected with a cover plate, the top outer wall of the main shaft is rotatably connected with the middle position of the bottom outer wall of the cover plate through a bearing, one end of an output shaft of the driving motor is fixedly connected with the bottom outer wall of the main shaft, the top circumferential inner wall of the main barrel is fixedly connected with a first filter screen, the top outer wall of the cover plate is provided with a cleaning mechanism, the middle position of the circumferential inner wall of the main barrel is fixedly connected with a feeding table, and the feeding table is in an inverted hollow round table shape, the outer wall of the bottom of the feeding table is provided with a discharging mechanism, and the outer wall of the bottom of the main cylinder is provided with a plurality of discharging holes which are distributed at equal intervals.
Preferably, the reduction gears include a plurality of pinion that the equidistance distributes, and a plurality of interior racks of the circumference inner wall fixedly connected with equidistance distribution of rotatory section of thick bamboo, the bottom circumference inner wall fixedly connected with backup pad of rotatory section of thick bamboo, the pinion all rotates through the bearing to be connected in the top outer wall of backup pad, the pinion all meshes with the internal rack mutually, and the top circumference outer wall fixedly connected with master gear of main shaft, the master gear all meshes with the pinion mutually.
Preferably, discharge mechanism includes a plurality of first rotor plates of equidistance distribution, and the bottom outer wall fixedly connected with of feed table goes out the feed cylinder, and the equal fixed connection of first rotor plate is in the circumference outer wall of main shaft, goes out the top and the bottom circumference outer wall of feed cylinder and all opens logical groove, leads to equal fixedly connected with second filter screen between the circumference inner wall of groove.
Preferably, clean the mechanism and include the column spinner, and column spinner fixed connection in the top outer wall of apron, the circumference outer wall fixedly connected with equidistant a plurality of scrapers of distributing of column spinner, the scrapers are "S" shape.
Preferably, the bottom of the circumferential outer wall of the main cylinder is fixedly connected with a support ring, and the bottom outer wall of the support ring is fixedly connected with a plurality of support rods which are distributed equidistantly.
Preferably, the discharging mechanism comprises a plurality of second rotating plates which are distributed at equal intervals, and a plurality of through holes which are distributed at equal intervals are formed between the outer walls of the two sides of each second rotating plate.
Preferably, the discharging mechanism comprises a plurality of third rotating plates which are distributed at equal intervals, and a plurality of crushing rods which are distributed at equal intervals are fixedly connected to the outer wall of one side of each third rotating plate.
The beneficial effects of the utility model are that:
1. through the main cylinder, the driving motor and the main shaft, when the driving motor drives the main shaft to rotate, the first rotating plate can rotate fast, the first filter screen can perform a first-stage filtering effect on soil entering the main cylinder to remove massive materials in the soil, and when the soil entering the discharging cylinder through the first filter screen touches the first rotating plate rotating fast, the soil can be thrown to the top and the bottom of the discharging cylinder, and in the continuous rotating and beating process of the first rotating plate, the soil quickly passes through the second filter screen, falls to the bottom of the main cylinder, and is discharged through the discharging hole, so that the multistage screening effect on the soil is realized, the structure is simple, the operation is convenient, when the main shaft drives the main gear to rotate, four auxiliary gears meshed with the main gear can also rotate, so as to drive the rotating cylinder to rotate slowly, because the diameter of the rotating cylinder is multifold main gear and auxiliary gear, therefore, the rotating speed of the rotating cylinder is slower than that of the main shaft, so that the cover plate, the rotating column and the scraping strip are driven to rotate, soil at the top of the first filter screen is scraped at a low speed, and the first filter screen is prevented from being blocked.
2. Through the second rotor plate that sets up, when being replaced for the second rotor plate that has the through-hole with first rotor plate, the second rotor plate can fully break up soil through the circular arc internal diameter at the pivoted in-process, has strengthened the screening effect to soil.
3. Through the third rotating plate, when the third rotating plate with the crushing rod rotates, caking objects possibly mixed in soil can be beaten and crushed, the possibility that the second filter screen is blocked is reduced, and the screening effect is enhanced.
Drawings
FIG. 1 is a schematic sectional front view showing an automatic soil aggregate screening apparatus according to example 1;
FIG. 2 is a schematic view showing a scraper bar structure of an automatic soil aggregate screening apparatus according to example 1;
FIG. 3 is a schematic diagram showing a second rotating plate structure of the automatic soil aggregate screening apparatus according to example 2;
fig. 4 is a schematic diagram showing the structure of a third rotary plate of the automatic soil aggregate screening device according to example 3.
In the figure: the device comprises a main cylinder 1, a support 2, a feeding table 3, a discharging cylinder 4, a second filter screen 5, a discharging hole 6, a driving motor 7, a main shaft 8, a supporting ring 9, a first rotating plate 10, a supporting plate 11, a first filter screen 12, a scraping strip 13, a rotating column 14, a cover plate 15, a main gear 16, a pinion 17, a rotating cylinder 18, a limiting ring 19, an inner rack 20, a second rotating plate 21, a through hole 22, a crushing rod 23 and a third rotating plate 24.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
In the description of this patent, it is to be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of describing the patent and for the simplicity of description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the patent.
Example 1
Referring to fig. 1-2, an automatic soil aggregate screening device comprises a main barrel 1, a discharge barrel 4, a first rotating plate 10 and a main gear 16, wherein the outer wall of the bottom of the main barrel 1 is connected with a driving motor 7 through a bolt, the inner wall of the bottom of the main barrel 1 is rotatably connected with a main shaft 8 through a bearing, the inner wall of the top of the main barrel 1 is welded with a plurality of brackets 2 which are distributed equidistantly, the inner wall of the other end of each bracket 2 is connected with a limit ring 19 through a bolt, the inner wall of the circumference of the limit ring 19 is rotatably connected with a rotating barrel 18 through a bearing, the inner wall of the circumference of the rotating barrel 18 is provided with a speed reducing mechanism, the outer wall of the top of the rotating barrel 18 is connected with a cover plate 15 through a bolt, the outer wall of the top of the main shaft 8 is rotatably connected with the middle position of the outer wall of the bottom of the cover plate 15 through a bearing, one end of an output shaft of the driving motor 7 is connected with the outer wall of the bottom of the main shaft 8 through a bolt, the inner wall of the circumference of the top of the main barrel 1 is connected with a first filter screen 12 through a bolt, and the top outer wall of the cover plate 15 is provided with a cleaning mechanism, the middle position of the circumferential inner wall of the main cylinder 1 is welded with a feeding table 3, the feeding table 3 is in an inverted hollow round table shape, the bottom outer wall of the feeding table 3 is provided with a discharging mechanism, and the bottom outer wall of the main cylinder 1 is provided with a plurality of discharging holes 6 which are distributed at equal intervals.
The speed reducing mechanism comprises a plurality of pinion gears 17 distributed equidistantly, a plurality of inner racks 20 distributed equidistantly are welded on the inner circumferential wall of the rotating cylinder 18, a supporting plate 11 is connected to the inner circumferential wall of the bottom of the rotating cylinder 18 through bolts, the pinion gears 17 are connected to the outer wall of the top of the supporting plate 11 through bearings in a rotating mode, the pinion gears 17 are meshed with the inner racks 20, a main gear 16 is connected to the outer circumferential wall of the top of the main shaft 8 through bolts, and the main gear 16 is meshed with the pinion gears 17.
Wherein, discharge mechanism includes a plurality of first rotor plates 10 that the equidistance distributes, and the welding of the bottom outer wall of feed table 3 has a feed cylinder 4, and first rotor plate 10 all welds in the circumference outer wall of main shaft 8, and logical groove has all been opened at the top of feed cylinder 4 and bottom circumference outer wall, all has second filter screen 5 through bolted connection between the circumference inner wall that leads to the groove.
The cleaning mechanism comprises a rotating column 14, the rotating column 14 is connected to the outer wall of the top of the cover plate 15 through bolts, a plurality of scraping strips 13 which are distributed equidistantly are welded to the outer wall of the circumference of the rotating column 14, and the scraping strips 13 are S-shaped.
Wherein, the bottom of the circumference outer wall of the main cylinder 1 is welded with a support ring 9, and the bottom outer wall of the support ring 9 is welded with a plurality of support rods distributed at equal intervals.
The working principle is as follows: when the driving motor 7 drives the main shaft 8 to rotate, the first rotating plate 10 rotates rapidly, the first filter screen 12 performs a first-stage filtering effect on soil entering the main barrel 1 to remove massive materials in the soil, and soil entering the discharging barrel 4 through the first filter screen 12 is thrown to the top and the bottom of the discharging barrel 4 when contacting the first rotating plate 10 rotating rapidly, and during continuous rotary striking of the first rotating plate 10, the soil rapidly passes through the second filter screen 5, falls on the bottom of the main barrel 1, and is discharged through the discharging hole 6, thereby realizing a multi-stage screening effect on the soil, the structure is simple, the operation is convenient, when the main shaft 8 drives the main gear 16 to rotate, the four auxiliary gears 17 meshed with the main gear 16 also rotate, thereby driving the rotating barrel 18 to rotate slowly, and as the diameter of the rotating barrel 18 is multiple of the main gear 16 and the auxiliary gears 17, therefore, the rotating speed of the rotary cylinder 18 is slower than that of the main shaft 8, so as to drive the cover plate 15, the rotary column 14 and the scraping strip 14 to rotate, and scrape the soil on the top of the first filter screen 12 at a low speed, thereby preventing the first filter screen 12 from being blocked.
Example 2
Referring to fig. 3, in the present embodiment, compared with embodiment 1, the discharging mechanism includes a plurality of second rotating plates 21 distributed at equal intervals, and a plurality of through holes 22 distributed at equal intervals are formed between outer walls of two sides of the second rotating plates 21.
The working principle is as follows: when the soil screening device is used, when the first rotating plate 10 is replaced by the second rotating plate 21 with the through hole 22, soil can be fully scattered by the arc inner diameter of the second rotating plate 21 in the rotating process, and the soil screening effect is enhanced.
Example 3
Referring to fig. 4, compared to embodiment 1, in the present embodiment, the discharging mechanism includes a plurality of third rotating plates 24 that are equidistantly distributed, and a plurality of crushing rods 23 that are equidistantly distributed are welded to an outer wall of one side of the third rotating plates 24.
The working principle is as follows: in use, when the third rotating plate 24 with the breaking bars 23 is rotated, the lumps possibly mixed in the soil are broken by beating, the possibility of the second sieve 5 being clogged is reduced, and the sieving effect is enhanced.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. The automatic soil aggregate screening device comprises a main barrel (1), a discharge barrel (4), a first rotating plate (10) and a main gear (16), and is characterized in that the bottom outer wall of the main barrel (1) is fixedly connected with a driving motor (7), the bottom inner wall of the main barrel (1) is rotatably connected with a main shaft (8) through a bearing, the top inner wall of the main barrel (1) is fixedly connected with a plurality of brackets (2) which are distributed equidistantly, a spacing ring (19) is fixedly connected between the inner walls of the other ends of the brackets (2), the circumferential inner wall of the spacing ring (19) is rotatably connected with a rotating barrel (18) through a bearing, the circumferential inner wall of the rotating barrel (18) is provided with a speed reducing mechanism, the top outer wall of the rotating barrel (18) is fixedly connected with a cover plate (15), and the top outer wall of the main shaft (8) is rotatably connected to the middle position of the bottom outer wall of the cover plate (15) through a bearing, output shaft one end fixed connection of driving motor (7) is in the bottom outer wall of main shaft (8), the first filter screen of top circumference inner wall fixedly connected with (12) of a main section of thick bamboo (1), and the top outer wall of apron (15) is provided with cleans the mechanism, circumference inner wall intermediate position fixedly connected with feed table (3) of a main section of thick bamboo (1), and feed table (3) are handstand hollow round platform form, and the bottom outer wall of feed table (3) is provided with discharge mechanism, and a plurality of relief holes (6) that have the equidistance and distribute are opened to the bottom outer wall of a main section of thick bamboo (1).
2. The automatic soil aggregate screening device according to claim 1, wherein the speed reducing mechanism comprises a plurality of auxiliary gears (17) which are distributed equidistantly, a plurality of inner racks (20) which are distributed equidistantly are fixedly connected to the inner circumferential wall of the rotating cylinder (18), a supporting plate (11) is fixedly connected to the inner circumferential wall of the bottom of the rotating cylinder (18), the auxiliary gears (17) are rotatably connected to the outer top wall of the supporting plate (11) through bearings, the auxiliary gears (17) are meshed with the inner racks (20), a main gear (16) is fixedly connected to the outer top circumferential wall of the main shaft (8), and the main gear (16) is meshed with the auxiliary gears (17).
3. The automatic soil aggregate screening device according to claim 2, wherein the discharging mechanism comprises a plurality of first rotating plates (10) which are distributed equidistantly, a discharging barrel (4) is fixedly connected to the outer wall of the bottom of the feeding table (3), the first rotating plates (10) are fixedly connected to the outer wall of the circumference of the main shaft (8), through grooves are formed in the outer walls of the top and the bottom of the discharging barrel (4), and a second filter screen (5) is fixedly connected between the inner walls of the circumference of the through grooves.
4. The automatic soil aggregate screening device according to claim 3, wherein the cleaning mechanism comprises a rotating column (14), the rotating column (14) is fixedly connected to the outer wall of the top of the cover plate (15), a plurality of scraping strips (13) which are distributed at equal intervals are fixedly connected to the outer wall of the circumference of the rotating column (14), and the scraping strips (13) are S-shaped.
5. The automatic soil aggregate screening device according to any one of claims 1 to 4, wherein a support ring (9) is fixedly connected to the bottom of the outer circumferential wall of the main cylinder (1), and a plurality of support rods are fixedly connected to the outer bottom wall of the support ring (9) and are distributed at equal intervals.
6. The automatic soil aggregate screening device as claimed in claim 1, wherein the discharging mechanism comprises a plurality of second rotating plates (21) which are distributed at equal intervals, and a plurality of through holes (22) which are distributed at equal intervals are formed between the outer walls of the two sides of the second rotating plates (21).
7. The automatic soil aggregate screening device according to claim 1, wherein the discharging mechanism comprises a plurality of third rotating plates (24) which are distributed at equal intervals, and a plurality of crushing rods (23) which are distributed at equal intervals are fixedly connected to the outer wall of one side of each third rotating plate (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220121738.3U CN217237404U (en) | 2022-01-18 | 2022-01-18 | Automatic screening plant of soil aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220121738.3U CN217237404U (en) | 2022-01-18 | 2022-01-18 | Automatic screening plant of soil aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217237404U true CN217237404U (en) | 2022-08-19 |
Family
ID=82829327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220121738.3U Expired - Fee Related CN217237404U (en) | 2022-01-18 | 2022-01-18 | Automatic screening plant of soil aggregate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217237404U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445904A (en) * | 2022-11-11 | 2022-12-09 | 江苏金易惠环保科技有限公司 | Be used for prosthetic soil particle classification screening equipment of soil |
-
2022
- 2022-01-18 CN CN202220121738.3U patent/CN217237404U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115445904A (en) * | 2022-11-11 | 2022-12-09 | 江苏金易惠环保科技有限公司 | Be used for prosthetic soil particle classification screening equipment of soil |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217237404U (en) | Automatic screening plant of soil aggregate | |
| CN114471906A (en) | Brick making system by using construction waste and using method thereof | |
| CN110420684A (en) | A kind of low temperature colloid grinding device | |
| CN217411048U (en) | Environment-friendly ore crusher | |
| CN211099334U (en) | Bentonite reducing mechanism | |
| CN108787092A (en) | Building waste processing equipment and construction refuse regenerated system | |
| CN209953257U (en) | Rice processing is with loading attachment that has edulcoration function | |
| CN211538480U (en) | Roller sand screening machine | |
| CN112248303A (en) | A broken handle device for waste plastic | |
| CN112675949A (en) | Garbage classification screening installation for refuse treatment | |
| CN216940710U (en) | Go up rice steamer robot | |
| CN216856998U (en) | Fine solid powder coating vibration filtering device | |
| CN215996810U (en) | Solid waste treatment and crushing device | |
| CN114918231A (en) | Municipal administration building rubbish environmental protection processing apparatus | |
| CN210752887U (en) | A screening breaker for mining | |
| CN210585376U (en) | Get rid of device of ferromagnetic impurity in concrete | |
| CN114471808A (en) | Grinding machine of fine processing of high efficiency | |
| CN211385813U (en) | Impurity removing mechanism for sanitary towel production line | |
| CN220969902U (en) | Screening machine for hydraulic engineering | |
| CN220861657U (en) | Quartz sand circulation crushing equipment | |
| CN214261011U (en) | Hierarchical filter equipment is used in fruit juice beverage processing | |
| CN219024456U (en) | Crushing apparatus is used in metallic coating preparation | |
| CN219442392U (en) | Drug screening device | |
| CN218743179U (en) | Multi-stage screening device for production of compound fertilizer | |
| CN217184253U (en) | But dairy products apparatus for producing of edulcoration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220819 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |