CN203470390U - Friction cleaning machine for waste plastic films - Google Patents
Friction cleaning machine for waste plastic films Download PDFInfo
- Publication number
- CN203470390U CN203470390U CN201320532954.8U CN201320532954U CN203470390U CN 203470390 U CN203470390 U CN 203470390U CN 201320532954 U CN201320532954 U CN 201320532954U CN 203470390 U CN203470390 U CN 203470390U
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- China
- Prior art keywords
- friction
- section
- main shaft
- cleaning machine
- casing
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- 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.)
- Withdrawn - After Issue
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
- B29B17/02—Separating plastics from other materials
- B29B2017/0213—Specific separating techniques
- B29B2017/0286—Cleaning means used for separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
- B29L2007/008—Wide strips, e.g. films, webs
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- 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
- Y02W30/62—Plastics recycling; Rubber recycling
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The utility model discloses a friction cleaning machine for waste plastic films. The friction cleaning machine comprises a housing, an inner cylinder and a spindle. The inner cylinder is axially fixed in the housing. The inner cylinder comprises a feed friction section, a discharge section and a middle friction section. A cylindrical first filter screen and a cylindrical second filter screen are respectively mounted between the feed friction section and the middle friction section and between the discharge section and the middle friction section. The spindle is rotationally mounted in the housing and driven to rotate through a spindle power device. A spiral material pushing blades are mounted on the spindle in the range of the feed friction section. A plurality of discharge blades are mounted on the spindle in the range of the discharge section. A friction material shifting blade is mounted on the spindle in the range between the feed friction section and the discharge section. A washing water pipe for washing the first filter screen and the second filter screen and a water supply pipe opening for supplying water to the inner cylinder are arranged on the housing. The friction cleaning machine has the advantages that the strength of the housing of the cleaning machine can be guaranteed while the area of each filter screen is increased, the sewage discharge efficiency of the cleaning machine can be increased, and materials can be cleaned in a friction manner in the inner cylinder for enough time.
Description
Technical field
The utility model relates to thin film technique field, relates in particular to a kind of waste plastic film friction cleaning machine.
Background technology
Current friction cleaning machine generally comprises casing, and one end of this casing is provided with charging aperture, the other end is provided with discharging opening, and bottom arranges sewage draining exit; In casing, be rotatablely equipped with main shaft, the blade of spiral is set on main shaft, on casing, be provided with small opening, on casing, be provided with the feed pipe to supplying water in casing.Material enters from charging aperture, by main shaft, driven and rotate, between friction between material, material and blade, rub, between material and casing inner wall, rub, feed pipe supplies water in casing simultaneously, thereby waste plastic film friction can be cleaned, sewage flows out from small opening, and last material is derived through discharging opening.There is following defect in current this structure so: 1. small opening is arranged on casing, and main shaft rotates and is installed on casing, small opening area can not be too large, and the too large case strength of area reduces, possibly cannot meet the requirement of main shaft rotary support, also reduce the service life of machine, therefore, the small opening area of current cleaning machine is little, so just cause cleaning machine casing internal drainage not smooth,, can there is certain sewage, and then can affect follow-up rinsing work in the high humidity of the material of discharging; 2. due to the blade of spiral being set on main shaft, material is driven by main shaft and moves to discharging opening in casing so, the time that material rubs in casing just advances the speed of material to determine by main shaft, and the fraction time of current cleaning machine material in casing is shorter, and cleaning performance is inadequate.3. because material rubs in casing, particularly small opening position is more easily worn, once and small opening excessive wear, just very likely cause small opening to break, thereby material may spill from small opening, impact is normal to be used, once and small opening breaks and can only change so casing, thereby cause huge maintenance maintenance cost.
Utility model content
Technical problem to be solved in the utility model is: a kind of waste plastic film friction cleaning machine is provided, this cleaning machine adopts sheathed inner tube structure in casing, can when guaranteeing cleaning machine case strength, increase screen area, thereby improve the sewage expulsion efficiency of cleaning machine, on main shaft, be provided with the blade of three kinds of difference in functionality types, can guarantee that material cleans the sufficiently long time in inner core friction.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of waste plastic film friction cleaning machine, comprise casing, and one end of this casing is provided with charging aperture, the other end is provided with discharging opening, and bottom arranges sewage draining exit; Described friction cleaning machine also comprises inner core and main shaft, this inner core is axially fixed in casing, described inner core comprises charging friction section at charging aperture place, in the discharging section at discharging opening place and the intermediate friction section between feed zone and discharging section, between described charging friction section and intermediate friction section, between discharging section and intermediate friction section, be separately installed with the first screen cloth and second screen cloth of tubular; Described charging aperture and discharging opening are communicated with charging friction section and discharging section respectively; Described main shaft rotates to be installed in casing and by main shaft power device and drives rotation, and this main shaft axially runs through described inner core and is positioned at the center of inner core; On described main shaft, be positioned at charging friction section scope spiral pusher blade is installed, on described main shaft, be positioned at discharging section scope some discharge blades are installed, some friction material toggling blades are installed in scope on described main shaft between charging friction section and discharging section; Described casing be provided with the first screen cloth and the second screen cloth are rinsed wash tub pipe, the water supply mouth of pipe supplying water to inner core.
As a kind of preferred scheme, each material toggling blade that rubs is all identical with the angle of cut between main shaft.
As a kind of preferred scheme, in described friction material toggling blade, the friction material toggling blade within the scope of the first screen cloth and the angle of cut between main shaft are less than friction material toggling blade within the scope of the second screen cloth and the angle of cut between main shaft.
As a kind of preferred scheme, described the first screen cloth is detachably installed between charging friction section and intermediate friction section by bolt, and described the second screen cloth is detachably installed between discharging section and intermediate friction section by bolt.
As a kind of preferred scheme, described casing and inner core are obliquely installed, and described charging aperture is arranged at the low side of casing.
As a kind of preferred scheme, the two ends of described main shaft are rotated and are installed on casing by sealed bearing, described sealed bearing comprises sealing pedestal and bearing seat, sealing pedestal and bearing seat are all set on main shaft, between described main shaft and sealing pedestal, sealing ring is set, between main shaft and bearing seat, bearing is installed, on described sealed bearing, between seal receptacle body and bearing seat, is provided with discharge outlet.
Adopted after technique scheme, effect of the present utility model is: 1. this cleaning machine arranges inner core in the casing of sealing, and inner core is arranged to discrete three sections, between section and section, screen cloth is installed, like this, inner core only plays the effect that friction is cleaned, and the casing of sealing can supports main shaft rotation, like this, not only improve the intensity of whole cleaning machine but also increased the area of screen cloth, thereby the sewage in inner core can smooth and easyly be discharged, like this, the material of deriving from discharging opening is low containing sewage quantity, is conducive to next step rinsing; 2. the main shaft of this cleaning machine adopts the blade with three sections of function corresponding matching of inner core, and like this, material is longer in the fraction time of inner core inside, and cleaning performance is more desirable.
Again due in described friction material toggling blade, friction material toggling blade within the scope of the first screen cloth and the angle of cut between main shaft are less than friction material toggling blade within the scope of the second screen cloth and the angle of cut between main shaft, like this, friction material toggling blade within the scope of the second screen cloth is milder, material is carried slower in the second screen cloth like this, friction scavenging period is longer, and the meeting of the film in the second screen cloth quilt friction material toggling blade drive centrifugal dehydration, thereby can reduce the water content of discharging.
Again because described the first screen cloth is detachably installed between charging friction section and intermediate friction section by bolt, described the second screen cloth is detachably installed between discharging section and intermediate friction section by bolt, can be for convenience detach after these screen cloth wearing and tearing, save maintenance maintenance cost.
Again because the two ends of described main shaft are rotated and are installed on casing by sealed bearing, described sealed bearing comprises sealing pedestal and bearing seat, sealing pedestal and bearing seat are all set on main shaft, between described main shaft and sealing pedestal, sealing ring is set, between main shaft and bearing seat, bearing is installed, on described sealed bearing, between seal receptacle body and bearing seat, be provided with discharge outlet, therefore, once there is seal failure in sealing pedestal, sewage can not enter and in bearing block, damage bearing, but directly from being provided with discharge outlet between sealing pedestal and bearing seat, discharge, improve the functional reliability of cleaning machine.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the Facad structure schematic diagram of the utility model embodiment;
Fig. 2 be in Fig. 1 A to schematic diagram;
Fig. 3 is the structural representation of spindle unit in the utility model embodiment;
Fig. 4 be in Fig. 1 B to schematic diagram;
Fig. 5 is the local enlarged diagram at I place in Fig. 2;
In accompanying drawing: 1. casing; 11. charging apertures; 12. discharging openings; 13. sewage draining exits; 14. side cover plates; 15. upper top covers; 16. latching devices; 2. inner core; 21. charging friction section; 22. intermediate friction sections; 23. discharging sections; 3. main shaft power device; 4. wash tub pipe; 5. the first screen cloth; 6. the second screen cloth 6; 7. main shaft; 71. spiral pusher blades; 72. friction pusher blades; 73. discharge blades; 8. sealed bearing; 81. sealing pedestals; 82. bearing seats; 83. discharge outlet; 9. the water supply mouth of pipe.
The specific embodiment
Below by specific embodiment, the utility model is described in further detail.
As shown in Fig. 1,2,4, a kind of waste plastic film friction cleaning machine, comprise casing 1, it can be horizontally disposed that the arrangement of casing 1 has, and can be to be also obliquely installed, and its arrangement is according to the position of equipment before and after friction cleaning machine, so that its connection, described casing 1 is obliquely installed, and its inner core 2 described later is be obliquely installed the same with casing 1 also, and described charging aperture 11 is arranged at the low side of casing 1.One end of this casing 1 is provided with charging aperture 11, the other end is provided with discharging opening 12, bottom arranges sewage draining exit 13, charging aperture 11 is arranged at the top of casing 1, discharging opening 12 and sewage draining exit 13 are positioned at casing 1 bottom, and wherein, this casing 1 comprises framework, upper top cover 15, two side cover plates 14, base plate, two side cover plates 14 are articulated with on base plate, base plate is fixed on base of frame, and upper top cover 15 is fixed on the top of framework, and two side cover plates 14 are detachably fixing by latching device 16 and upper top cover 15.
As shown in Figure 1,3, described friction cleaning machine also comprises inner core 2 and main shaft 7, this inner core 2 is axially fixed in casing 1, described inner core 2 comprises in the charging friction section at charging aperture 11 places, in discharging section 23 and the intermediate friction section 22 between feed zone and discharging section 23 at discharging opening 12 places, between described charging friction section and intermediate friction section 22, between discharging section 23 and intermediate friction section 22, be separately installed with the first screen cloth 5 and second screen cloth 6 of tubular; Described charging aperture 11 and discharging opening 12 are communicated with charging friction section and discharging section 23 respectively; Described main shaft 7 rotates to be installed in casing 1 and by main shaft 7 power set 3 and drives rotation, these main shaft 7 power set 3 comprise motor and reducing gear, motor via reducer structure and main shaft 7 are in transmission connection, and this main shaft 7 axially runs through described inner core 2 and is positioned at the center of inner core 2; On described main shaft 7, be positioned at charging friction section scope spiral pusher blade 71 is installed, on described main shaft 7, be positioned at discharging section 23 scopes some discharge blades 73 are installed, some friction material toggling blades are installed in scope on described main shaft 7 between charging friction section and discharging section 23; From its function, spiral pusher blade 71 spirals are arranged within the scope of charging friction section, and spiral pusher blade 71 is for material provides thrust power, and hurricane band animal material also tentatively rubs simultaneously; And discharge blade 73 its functions are that material is discharged from discharging opening 12, the angle of cut between discharge blade 73 and main shaft 7 is 90.。And friction pusher blade 72 is discrete being arranged on main shaft 7 circumference and between charging friction section and discharging section 23 in scope, each angle of cut position acute angle between pusher blade 72 and main shaft 7 tracts that rubs.These main shaft 7 tracts refer to a section near discharging opening 12.Material is under friction pusher blade 72 promotes, and friction between material and friction pusher blade 72, rubs between material and material, the friction between material and inner core 2 walls, and by bath, plastic sheeting impurity is cleared up.Each material toggling blade that rubs is all identical with the angle of cut between main shaft 7.Further preferred, in described friction material toggling blade, the friction material toggling blade in the first screen cloth 5 scopes and the angle of cut between main shaft 7 are less than friction material toggling blade in the second screen cloth 6 scopes and the angle of cut between main shaft 7.Like this, and the fltting speed of material in the second screen cloth 6 scopes is less than the fltting speed in the first screen cloth 5 scopes, thereby the fltting speed of material is advanced from high to low, during low speed, the material frictional cleaning time is long, cleaning effect is good, and in the second screen cloth 6 scopes, its pusher speed is slow, in friction, also produce certain centrifugal force dehydration, so just make the material moisture of discharge lower.Described casing 1 be provided with screen cloth is rinsed wash tub pipe 4, the water supply mouth of pipe 9 supplying water to inner core 2, the rinse mouth of wash tub pipe 4 is at least two, and has respectively one at least in the first screen cloth 5 scopes and the second screen cloth 6 scopes, wash tub pipe 4 not only can supply water for inner core 2, but also can clean the first screen cloth 5 and the second screen cloth 6, avoid the first screen cloth 5 and the second screen cloth 6 to stop up.Because casing 1 plays the effect that supports main shaft 7 is rotated, and the propelling that inner core 2 is material and friction provide space, and therefore, it is larger that the first screen cloth 5 in inner core 2 and the area of the second screen cloth 6 can be oppositely arranged, thereby be convenient to leak, and reduces the sewage quantity that contains in material.
Described the first screen cloth 5 is detachably installed between charging friction section and intermediate friction section 22 by bolt, and described the second screen cloth 6 is detachably installed between discharging section 23 and intermediate friction section 22 by bolt.Its removably can adopt securing member to fix, for example bolt.The first screen cloth 5 and the second screen cloth 6 may wear and tear after rubbing with material is long-time, so only need to change the first screen cloth 5 and the second screen cloth 6.
As shown in Figure 5, and in order to improve the functional reliability of friction cleaning machine, the two ends of described main shaft 7 are rotated and are installed on casing 1 by sealed bearing 8, described sealed bearing 8 comprises sealing pedestal 81 and bearing seat 82, sealing pedestal 81 and bearing seat 82 are all set on main shaft 7, between described main shaft 7 and sealing pedestal 81, sealing ring is set, between main shaft 7 and bearing seat 82, bearing is installed, on described sealed bearing 8, between seal receptacle body 81 and bearing seat 82, is provided with discharge outlet 83.
Operation principle of the present utility model is: the material after being broken is from charging aperture 11 enters, by spiral pusher blade 71, promoted to push ahead, the water supply mouth of pipe 9 and wash tub pipe 4 all supply water, the interior material of the flushable inner core 2 of the water supply mouth of pipe 9, wash tub pipe 4 rinses the first screen cloth 5 and the second screen cloth 6, and the auxiliary interior material of inner core 2 that rinses, material in inner core 2 is rinsed by water when friction advances like this, thereby reach the object that friction is cleaned, sewage throws away from the first screen cloth 5 and the second screen cloth 6, finally, the material few containing sewage quantity driven discharging by discharge blade 73, material is few containing sewage quantity, next step rinsing is quicker, wash effect is good, and be also difficult for polluting washings.
Claims (6)
1. a waste plastic film friction cleaning machine, comprises casing, and one end of this casing is provided with charging aperture, the other end is provided with discharging opening, and bottom arranges sewage draining exit; It is characterized in that: described friction cleaning machine also comprises inner core and main shaft, this inner core is axially fixed in casing, described inner core comprises charging friction section at charging aperture place, in the discharging section at discharging opening place and the intermediate friction section between feed zone and discharging section, between described charging friction section and intermediate friction section, between discharging section and intermediate friction section, be separately installed with the first screen cloth and second screen cloth of tubular; Described charging aperture and discharging opening are communicated with charging friction section and discharging section respectively; Described main shaft rotates to be installed in casing and by main shaft power device and drives rotation, and this main shaft axially runs through described inner core and is positioned at the center of inner core; On described main shaft, be positioned at charging friction section scope spiral pusher blade is installed, on described main shaft, be positioned at discharging section scope some discharge blades are installed, some friction material toggling blades are installed in scope on described main shaft between charging friction section and discharging section; Described casing be provided with the first screen cloth and the second screen cloth are rinsed wash tub pipe, the water supply mouth of pipe supplying water to inner core.
2. a kind of waste plastic film friction cleaning machine as claimed in claim 1, is characterized in that: each material toggling blade that rubs is all identical with the angle of cut between main shaft.
3. a kind of waste plastic film friction cleaning machine as claimed in claim 1, it is characterized in that: in described friction material toggling blade, the friction material toggling blade within the scope of the first screen cloth and the angle of cut between main shaft are less than friction material toggling blade within the scope of the second screen cloth and the angle of cut between main shaft.
4. a kind of waste plastic film friction cleaning machine as described in claims 1 to 3 any one, it is characterized in that: described the first screen cloth is detachably installed between charging friction section and intermediate friction section by bolt, and described the second screen cloth is detachably installed between discharging section and intermediate friction section by bolt.
5. a kind of waste plastic film friction cleaning machine as claimed in claim 4, it is characterized in that: described casing and inner core are obliquely installed, and described charging aperture is arranged at the low side of casing.
6. a kind of waste plastic film friction cleaning machine as claimed in claim 5, it is characterized in that: the two ends of described main shaft are rotated and are installed on casing by sealed bearing, described sealed bearing comprises sealing pedestal and bearing seat, sealing pedestal and bearing seat are all set on main shaft, between described main shaft and sealing pedestal, sealing ring is set, between main shaft and bearing seat, bearing is installed, on described sealed bearing, between seal receptacle body and bearing seat, is provided with discharge outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320532954.8U CN203470390U (en) | 2013-08-29 | 2013-08-29 | Friction cleaning machine for waste plastic films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320532954.8U CN203470390U (en) | 2013-08-29 | 2013-08-29 | Friction cleaning machine for waste plastic films |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203470390U true CN203470390U (en) | 2014-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320532954.8U Withdrawn - After Issue CN203470390U (en) | 2013-08-29 | 2013-08-29 | Friction cleaning machine for waste plastic films |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203470390U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418570A (en) * | 2013-08-29 | 2013-12-04 | 张家港市联达机械有限公司 | Waste plastic thin film friction washing machine |
| CN104061760A (en) * | 2014-06-27 | 2014-09-24 | 张家港市联达机械有限公司 | Horizontal dewatering machine for waste plastics |
| CN105128179A (en) * | 2015-09-01 | 2015-12-09 | 夏成洪 | Special multifunctional cleaning and spin-drying integrated machine for waste ultrathin agricultural mulch |
| CN105880237A (en) * | 2016-02-25 | 2016-08-24 | 张家港市格雷斯机械有限公司 | Rotary potcher with high cleaning efficiency |
| WO2018073455A1 (en) * | 2016-10-21 | 2018-04-26 | Suez Groupe | Compact device for recycling plastic waste |
| CN108971066A (en) * | 2018-08-20 | 2018-12-11 | 广州市联冠机械有限公司 | A kind of friction cleaning machine |
| IT201700148711A1 (en) * | 2017-12-22 | 2019-06-22 |
-
2013
- 2013-08-29 CN CN201320532954.8U patent/CN203470390U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103418570A (en) * | 2013-08-29 | 2013-12-04 | 张家港市联达机械有限公司 | Waste plastic thin film friction washing machine |
| CN103418570B (en) * | 2013-08-29 | 2015-05-20 | 张家港市联达机械有限公司 | Waste plastic thin film friction washing machine |
| CN104061760A (en) * | 2014-06-27 | 2014-09-24 | 张家港市联达机械有限公司 | Horizontal dewatering machine for waste plastics |
| CN104061760B (en) * | 2014-06-27 | 2016-05-25 | 张家港市联达机械有限公司 | A kind of waste or used plastics horizontal hydroextractor |
| CN105128179A (en) * | 2015-09-01 | 2015-12-09 | 夏成洪 | Special multifunctional cleaning and spin-drying integrated machine for waste ultrathin agricultural mulch |
| CN105128179B (en) * | 2015-09-01 | 2017-08-29 | 夏成洪 | A kind of agricultural ultra-thin waste mulching film cleaning dries multifunctional integrated special machine |
| CN105880237A (en) * | 2016-02-25 | 2016-08-24 | 张家港市格雷斯机械有限公司 | Rotary potcher with high cleaning efficiency |
| WO2018073455A1 (en) * | 2016-10-21 | 2018-04-26 | Suez Groupe | Compact device for recycling plastic waste |
| FR3057789A1 (en) * | 2016-10-21 | 2018-04-27 | Suez Groupe | COMPACT DEVICE FOR RECYCLING PLASTIC WASTE |
| IT201700148711A1 (en) * | 2017-12-22 | 2019-06-22 | ||
| CN108971066A (en) * | 2018-08-20 | 2018-12-11 | 广州市联冠机械有限公司 | A kind of friction cleaning machine |
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| GR01 | Patent grant | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20150520 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140312 Effective date of abandoning: 20150520 |
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| RGAV | Abandon patent right to avoid regrant |