CN208762996U - Dust-settling quick impact rammer - Google Patents
Dust-settling quick impact rammer Download PDFInfo
- Publication number
- CN208762996U CN208762996U CN201820806477.2U CN201820806477U CN208762996U CN 208762996 U CN208762996 U CN 208762996U CN 201820806477 U CN201820806477 U CN 201820806477U CN 208762996 U CN208762996 U CN 208762996U
- Authority
- CN
- China
- Prior art keywords
- depositing dust
- leaf
- dust fall
- power assembly
- dust
- 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
- 239000000428 dust Substances 0.000 claims abstract description 133
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000003860 storage Methods 0.000 claims abstract description 16
- 238000000151 deposition Methods 0.000 claims description 104
- 239000011248 coating agent Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 125000004122 cyclic group Chemical group 0.000 claims description 4
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 13
- 230000036541 health Effects 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000004062 sedimentation Methods 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004744 fabric Substances 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Road Paving Machines (AREA)
Abstract
The utility model provides a quick battering ram of dust fall relates to rammer technical field. Quick battering ram of dust fall includes: and a power assembly. The power assembly is connected with the handle frame, and the handle frame comprises a holding part and a guide hole. The rammer board, the rammer board is connected with the power assembly transmission, and the rammer board includes the installation department. Dust fall subassembly, the dust fall subassembly includes the water storage box, the pipe, dust fall pole and dust fall leaf, the one end and the installation department fixed connection of dust fall pole, the other one end of dust fall pole is worn to locate the guiding hole and can be along the axial reciprocating motion of guiding hole under power assembly's drive, the dust fall leaf sets up along the length direction of dust fall pole, bag chamber has in the dust fall leaf, the edge of dust fall leaf has a plurality of apopores, the water storage box sets up and is connected and communicate with the bag chamber in handle frame and dust fall leaf through the pipe, the height of water storage box is higher than the dust fall leaf. The dust fall quick battering ram can avoid the ramming construction environment to have a large amount of dust pollution, also avoids influencing constructor's health.
Description
Technical field
The utility model relates to ramming machine technical fields, in particular to a kind of depositing dust speed rammer impactor.
Background technique
Ramming machine is a kind of machinery for compacting.Soil compaction is backfilled using impact and impact vibration effect compaction in layers
It is mechanical.It is chiefly used in tying ground when construction, tamping.
Ramming machine is generally divided into firepower rammer, electronic frog rammer and speed rammer impactor.
Wherein, speed rammer impactor is to drive hammer ram to do quick washing movement through retarder and crank link mechanism by motor
To tamp soil, when hammer ram jumps out of ground, operator can push mechanical advance, to mitigate body vibration, make cylinder vertical axis
Facing forward deflection sets buffer spring group.
The effect that rammer tamps clayed soil is preferable, but its hammer ram limited area, should not be used in the rammer of the large area earthwork
Implementation industry.Sand, gravel are then needed optionally to be consolidated with vibration compaction machine.
Existing speed rammer impactor is remained using problem:
It is easy that dust is inspired when tamping operation, not only it is unfavorable for dust Control, but also influence construction personnel's health.
Utility model content
The purpose of this utility model is to provide a kind of depositing dust speed rammer impactors, can be in construction personnel in use, benefit
Tiny droplet is thrown away with the up and down motion of ramming, the dust near depositing dust speed rammer impactor is adsorbed and is avoided to reduce dust
Construction environment has a large amount of dust pollution, also avoids the health for influencing construction personnel.
The embodiments of the present invention are achieved in that
The embodiments of the present invention provide a kind of depositing dust speed rammer impactor, comprising:
Power assembly；
Handle holder, the power assembly connect with the handle holder, and the handle holder includes grip part and pilot hole；
Tamping plate, the tamping plate and the power assembly are sequentially connected, and the tamping plate includes mounting portion；
Depositing dust component, the depositing dust component include water storage case, conduit, depositing dust bar and depositing dust leaf, one end of the depositing dust bar
It is fixedly connected with the mounting portion, the other end of the depositing dust bar is arranged in the pilot hole and can be in the power assembly
Drive lower edge described in pilot hole axially reciprocating, the depositing dust leaf along the depositing dust bar length direction be arranged, institute
Stating has blister cavities in depositing dust leaf, the edge of the depositing dust leaf has multiple apopores, and the water storage case is set to the handle holder
And connect with the depositing dust leaf and be connected to the blister cavities by the conduit, the height of the water storage case is higher than the depositing dust
Leaf.
In addition, the depositing dust speed rammer impactor that embodiment according to the present utility model provides, can also have following additional
Technical characteristic:
In the alternative embodiment of the utility model, the depositing dust leaf is fan-shaped.
In the alternative embodiment of the utility model, the depositing dust component at least there are two, multiple apopores go out
Circumferential direction of the water direction towards the tamping plate.
In the alternative embodiment of the utility model, the depositing dust leaf includes base portion and flexible part, and the base portion is fixed to be connected
It is connected to the depositing dust bar, the flexible part is distributed along the edge of the base portion, and the apopore is located at the flexible part.
In the alternative embodiment of the utility model, the flexible part is cyclic annular in fan.
In the alternative embodiment of the utility model, the flexible part is rubber.
In the alternative embodiment of the utility model, the section of flexible part triangle at an acute angle, the width in section from
It is gradually reduced with the junction of the base portion towards other side.
In the alternative embodiment of the utility model, the grip part includes holding rod and gripping sleeve, the grip sleeve
Cylinder is rotationally sheathed on the holding rod.
In the alternative embodiment of the utility model, the outer surface for holding sleeve has insulating coating.
In the alternative embodiment of the utility model, the power assembly includes decelerating motor, the middle part of the handle holder
For installing zone, the decelerating motor is connected to the handle holder and is located at the installing zone.
The beneficial effects of the utility model are:
Depositing dust speed rammer impactor is able to drive depositing dust leaf regular movements by the conduction of power, so that water is thrown away from apopore,
Curtain barrier is formed in a certain range, fugitive dust when to depositing dust speed rammer impactor ramming carries out adsorption and sedimentation.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is the schematic diagram for the depositing dust speed rammer impactor that the embodiments of the present invention 1 provide；
Fig. 2 is the schematic diagram of depositing dust leaf；
Fig. 3 is the sectional view of depositing dust leaf；
Fig. 4 is the cross-sectional view of grip part；
Fig. 5 is the position view of the mounting portion of tamping plate.
Icon: 100- depositing dust speed rammer impactor；10- power assembly；30- handle holder；The grip part 31-；312- holding rod；
314- holds sleeve；50- tamping plate；51- mounting portion；70- depositing dust bar；72- depositing dust leaf；721- base portion；723- flexible part；730- capsule
Chamber；740- apopore；101- installing zone.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be noted that the orientation or positional relationship of the instructions such as term "inner", "outside"
For be based on the orientation or positional relationship shown in the drawings or the utility model product using when the orientation or position usually put
Relationship is merely for convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.This
Outside, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in utility model.
In the present invention unless specifically defined or limited otherwise, fisrt feature is on or below second feature
It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it
Between other characterisation contact.Moreover, fisrt feature is on second feature, top and above include fisrt feature the
Right above two features and oblique upper, or first feature horizontal height is merely representative of higher than second feature.Fisrt feature is in the second spy
Under sign, lower section and fisrt feature included below be directly below and diagonally below the second feature, or be merely representative of fisrt feature level
Height is less than second feature.
Embodiment 1
Fig. 1 to Fig. 5 is please referred to, a kind of depositing dust speed rammer impactor 100 is present embodiments provided, comprising:
Power assembly 10；
Handle holder 30, power assembly 10 connect with handle holder 30, and handle holder 30 includes grip part 31 and pilot hole；
Tamping plate 50, tamping plate 50 and power assembly 10 are sequentially connected, and tamping plate 50 includes mounting portion 51；
Depositing dust component, depositing dust component include water storage case, conduit, depositing dust bar 70 and depositing dust leaf 72, one end of depositing dust bar 70 with
Mounting portion 51 is fixedly connected, and the other end of depositing dust bar 70 is arranged in pilot hole and can lead in the drive lower edge of power assembly 10
To the axially reciprocating in hole, depositing dust leaf 72 is arranged along the length direction of depositing dust bar 70, has blister cavities 730 in depositing dust leaf 72,
The edge of depositing dust leaf 72 has multiple apopores 740, and water storage case is set to handle holder 30 and is connect by conduit with depositing dust leaf 72
And be connected to blister cavities 730, the height of water storage case is higher than depositing dust leaf 72.
Specifically, depositing dust leaf 72 is fan-shaped.
More specifically, at least there are two (only show one, another is symmetrically distributed in power therewith to depositing dust component in figure
The other side of assembly 10), the circumferential direction of the water discharging directions of multiple apopores 740 towards tamping plate 50.
Detailed to be about depositing dust leaf 72, depositing dust leaf 72 includes base portion 721 and flexible part 723, and base portion 721 is fixedly connected
In depositing dust bar 70, flexible part 723 is distributed along the edge of base portion 721, and apopore 740 is located at flexible part 723.
Further, flexible part 723 is cyclic annular in fan.
Further, flexible part 723 is rubber.
In the present embodiment, the section of flexible part 723 triangle at an acute angle, the width in section is from the connection with base portion 721
Place is gradually reduced towards other side.
Grip part 31 includes holding rod 312 and holds sleeve 314, holds sleeve 314 and is rotationally sheathed on holding rod
312。
The outer surface for holding sleeve 314 has insulating coating.
Power assembly 10 includes decelerating motor, and the middle part of handle holder 30 is installing zone 101, and decelerating motor is connected to handle holder
30 and be located at installing zone 101.
Flexible part 723 can be made to swing up and down compared to base portion 721 in this way, be conducive to water in this way from blister cavities 730
It is thrown away through apopore 740.
And since the width in section is gradually reduced, the inertia at the edge of flexible part 723 is smaller, so that depositing dust leaf 72
It is not easy to lose.
In addition, the design in section also makes the edge of flexible part 723, amplitude of fluctuation is big, droplet can be promoted to exist
More uniformly spread in a certain range, depositing dust leaf 72 up and down repeatedly movement in, the more droplets of uniformly dispersing.
Specifically, grip part 31 includes holding rod 312 and holds sleeve 314, gripping sleeve 314, which is rotationally sheathed on, to be held
Hold bar 312.
The mode for realizing rotation can be in holding rod 312 and hold setting ball between sleeve 314 or rolling be arranged
Column, so, vibration of the holding rod 312 under the action of power assembly 10 and ground instead shake, when being transmitted to gripping sleeve 314
The power of unloading of roller or ball carried out centainly can be first passed through, that is, holds sleeve 314 after construction personnel holds with a firm grip, Neng Gouxiang
There is the rotation of certain amplitude for holding rod 312, to avoid shaking the arm for being applied directly to construction personnel with reaction force
On.
More specifically, the outer surface for holding sleeve 314 has insulating coating.When in this way can be to avoid there is electric current leakage,
Electricity hurts construction personnel.
In this way when carrying out ramming operation, the anti-active force shaken in ground can be in holding rod 312 and gripping 314 phase of sleeve
Certain neutralizing is obtained when to rotation, avoids vibration so that construction personnel's excessively hand acid, ensures the quality of ramming and guarantor
Barrier uses safe.
Power assembly 10 includes decelerating motor, and the middle part of handle holder 30 is installing zone 101, and decelerating motor is connected to handle holder
30 and be located at installing zone 101.
The structure and function of power assembly 10 can refer to the motor of speed rammer impactor in the prior art, retarder and
Other dependency structures, are no longer repeated herein.
The principle of the present embodiment is:
Before using depositing dust speed rammer impactor 100, the water for being used for depositing dust, such as tap water first is added in water storage case again
Deng, as long as not will cause environmental pollution and without impurity blocking apopore 740 water as long as can satisfy requirement.
Since the height of water storage case is higher than depositing dust leaf 72, the water energy in water storage case is enough under self gravitation effect, along leading
Pipe is flowed into the blister cavities 730 of depositing dust leaf 72.
When carrying out ramming, the shock ramming ground upper and lower, back and forth under the drive of power assembly 10 of tamping plate 50, and
The up and down motion of tamping plate 50 then can drive depositing dust bar 70 to move together.
Depositing dust bar 70 under the guiding role of pilot hole, will not it is such up and down reciprocatingly in wave, and be to maintain
The axial direction of pilot hole moves repeatedly.Lubricating oil can be periodically added at pilot hole, to ensure the smoothness of the movement of depositing dust bar 70, subtracted
The abrasion of the hole wall of few depositing dust bar 70 and pilot hole.
Depositing dust leaf 72 is under the drive of depositing dust bar 70, regular movements up and down repeatedly.Depositing dust leaf 72 is fan-shaped, enables to apopore
740 distribution more extensively and covering face more evenly.
When thus allowing the water to throw away from blister cavities 730, and throwing away, it can be dissipated by the laying of apopore 740
Cloth more it is extensive uniformly.Around depositing dust speed rammer impactor 100, uniform curtain barrier is generated, in this way when there is dust to raise,
It can be adsorbed, then be dropped to again on the ground by droplet in time, dust is avoided largely to raise.
Due to flexible portion 723, the amplitude of swing can be bigger, so being more advantageous to the distribution of droplet.The region of covering
It is more careful, it is more advantageous to the adsorption and sedimentation for dust.
Flexible part 723 itself is cyclic annular in fan, and section is by thick again to thin, and in swing, can ensure to roll over easily
Damage, and can ensure the distribution of droplet, it is very practical.
In addition, avoid arm sour and astringent to further decrease feeling of fatigue, grip part 31 be designed to holding rod 312 with
Hold the structure of sleeve 314.
When construction personnel uses the depositing dust speed rammer impactor 100 in this way, comfort can be for common battering ram
More preferably.
The depositing dust speed rammer impactor 100 of the present embodiment can drive tamping plate 50 by power assembly 10, and then pass through tamping plate
50 drive depositing dust bar 70 to move up and down, final to drive about 72 regular movements of depositing dust leaf, so that the water in water storage case is dissipated from apopore 740
Cloth is gone out, and is carried out adsorption and sedimentation to dust in a certain range, is avoided fugitive dust, be conducive to the dust Control of construction environment, and energy
Enough avoid influencing the health of construction personnel.
Embodiment 2
The present embodiment is also provided that a kind of depositing dust speed rammer impactor 100, the depositing dust speed rammer impactor 100 of the present embodiment with
The difference of depositing dust speed rammer impactor 100 in embodiment 1 essentially consists in:
Depositing dust leaf 72 is to arrange with helically rising from the bottom up.
Namely multiple depositing dust leaves 72 are not exclusively overlapped along the projection in 70 direction of depositing dust bar.Its shape can refer to spiral shell
Revolve the stair of shape.
The other structures of depositing dust speed rammer impactor 100 can refer to the depositing dust speed rammer impactor 100 in embodiment 1 and show
There is technology.
By adjusting the laying mode of depositing dust leaf 72, droplet uniformly dispersing is equally enabled to, when ensureing for ramming
The absorption and sedimentation of fugitive dust.
In conclusion the depositing dust speed rammer impactor 100 of the utility model is able to drive depositing dust leaf 72 by the conduction of power
Regular movements forms curtain barrier in a certain range, raises when to depositing dust 100 ramming of speed rammer impactor so that water is thrown away from apopore 740
Dirt carries out adsorption and sedimentation.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of depositing dust speed rammer impactor characterized by comprising
Power assembly；
Handle holder, the power assembly connect with the handle holder, and the handle holder includes grip part and pilot hole；
Tamping plate, the tamping plate and the power assembly are sequentially connected, and the tamping plate includes mounting portion；
Depositing dust component, the depositing dust component include water storage case, conduit, depositing dust bar and depositing dust leaf, one end of the depositing dust bar and institute
It states mounting portion to be fixedly connected, the other end of the depositing dust bar is arranged in the pilot hole and can be in the band of the power assembly
The axially reciprocating of pilot hole described in dynamic lower edge, the depositing dust leaf are arranged along the length direction of the depositing dust bar, the drop
There is blister cavities, the edge of the depositing dust leaf has multiple apopores, and the water storage case is set to the handle holder and leads in dirt leaf
It crosses the conduit to connect with the depositing dust leaf and be connected to the blister cavities, the height of the water storage case is higher than the depositing dust leaf.
2. depositing dust speed rammer impactor according to claim 1, which is characterized in that the depositing dust leaf is fan-shaped.
3. depositing dust speed rammer impactor according to claim 1, which is characterized in that the depositing dust component at least there are two, it is more
Circumferential direction of the water discharging direction of a apopore towards the tamping plate.
4. depositing dust speed rammer impactor according to claim 1, which is characterized in that the depositing dust leaf includes base portion and flexibility
Portion, the base portion are fixedly connected on the depositing dust bar, and the flexible part is distributed along the edge of the base portion, the water outlet hole location
In the flexible part.
5. depositing dust speed rammer impactor according to claim 4, which is characterized in that the flexible part is cyclic annular in fan.
6. depositing dust speed rammer impactor according to claim 4, which is characterized in that the flexible part is rubber.
7. depositing dust speed rammer impactor according to claim 4, which is characterized in that the section of flexible part triangle at an acute angle
The width of shape, section is gradually reduced from the junction with the base portion towards other side.
8. depositing dust speed rammer impactor according to claim 1, which is characterized in that the grip part includes holding rod and gripping
Sleeve, the gripping sleeve are rotationally sheathed on the holding rod.
9. depositing dust speed rammer impactor according to claim 8, which is characterized in that the outer surface for holding sleeve has exhausted
Edge coating.
10. depositing dust speed rammer impactor according to claim 1, which is characterized in that the power assembly includes decelerating motor,
The middle part of the handle holder is installing zone, and the decelerating motor is connected to the handle holder and is located at the installing zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820806477.2U CN208762996U (en) | 2018-05-28 | 2018-05-28 | Dust-settling quick impact rammer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820806477.2U CN208762996U (en) | 2018-05-28 | 2018-05-28 | Dust-settling quick impact rammer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208762996U true CN208762996U (en) | 2019-04-19 |
Family
ID=66127140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820806477.2U Expired - Fee Related CN208762996U (en) | 2018-05-28 | 2018-05-28 | Dust-settling quick impact rammer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208762996U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111576147A (en) * | 2020-05-13 | 2020-08-25 | 四川志德公路工程有限责任公司 | Road and bridge construction is with tamping machinery's dust device |
-
2018
- 2018-05-28 CN CN201820806477.2U patent/CN208762996U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111576147A (en) * | 2020-05-13 | 2020-08-25 | 四川志德公路工程有限责任公司 | Road and bridge construction is with tamping machinery's dust device |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190419 Termination date: 20210528 |
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| CF01 | Termination of patent right due to non-payment of annual fee |