CN207534342U - A kind of aluminium alloy wheel hub drilling equipment - Google Patents
A kind of aluminium alloy wheel hub drilling equipment Download PDFInfo
- Publication number
- CN207534342U CN207534342U CN201721269035.0U CN201721269035U CN207534342U CN 207534342 U CN207534342 U CN 207534342U CN 201721269035 U CN201721269035 U CN 201721269035U CN 207534342 U CN207534342 U CN 207534342U
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- motor
- water
- wheel hub
- babinet
- aluminium alloy
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Abstract
The utility model discloses a kind of aluminium alloy wheel hub drilling equipments, including babinet and clamping device, the inside of babinet is fixedly connected with organic block, the upper end of engine base is from left to right installed with the first motor and water pump successively, the upper right corner of cabinets cavity and water tank is offered above the engine base, the centre of cabinets cavity offers Processing Room, the bottom of cabinets cavity offers cesspool, the front end of first motor output shaft is installed with first gear, and the utility model is related to auto parts technical field of processing equipment.The aluminium alloy wheel hub drilling equipment, it is drawn water from water tank by water pump, water is sprayed from Bidirectional spray head by the drainpipe for sequentially passing through hollow rack, shaft, hollow shaft and cabinet, water is made to spray to drill bit and grinding head simultaneously, water spray can wash away metal fragment, ensure that it will not be drifted, while can cool down to drill bit and grinding head, extend the physical life of drill bit and grinding head, reduce the loss of cost.
Description
Technical field
The utility model is related to auto parts technical field of processing equipment, specially a kind of aluminium alloy wheel hub drilling equipment.
Background technology
Wheel hub is wide support the drum-shaped of tire, metal parts of the center on axis in tire, is called wheel rim, steel
Circle, wheel, tire bell.Wheel hub is divided into many types according to the difference of diameter, width, molding mode and material.The hub spindle of car
It is in pairs using single-row tapered roller or ball bearing to hold over most, and with the development of technology, car widely uses
Car hub unit.The use scope and usage amount of hub-bearing unit are growing, have had evolved to the third generation：The first generation
It is made of double row angular contact bearing.The second generation in outer rollaway nest there are one being used for the fixed flange of bearing, can simply by
Bearing is set on wheel shaft and is fixed with nut.So that the repair of automobile becomes easy.Third generation hub-bearing unit is to employ axis
Bearing unit and anti-brake holding system match.Hub unit has been designed to inner flange and outward flange, and inner flange is fixed by bolts to drive
On moving axis, entire bearing is installed together by outward flange.
According to the feature and demand of different automobile types, hub surface treatment process can also take different modes, can substantially divide
For two kinds of baking vanish and plating.The wheel hub of ordinary vehicle type considers less in appearance, and thermal diffusivity is a basic demand well, technique
Upper substantially using paint baking, i.e. first spraying and then electricity is roasting, and cost is both economical and color is beautiful, the retention time is permanent, i.e.,
Make vehicle scrapping, the color of wheel hub is still constant.Many masses' vehicle hub surface treatment process are all baking vanish.Some fashion
What colored wheel hub fashionable, full of moving sense used is also baking vanish technology.This kind of wheel hub is moderate, complete in specifications.
Plating wheel hub is divided into the types such as electrosilvering, water power plating and pure plating.Although electrosilvering and water power plating wheel hub color and luster are fresh
It is bright lively, but the retention time is shorter, so price is relatively cheap, is liked much to pursue fraicheur young man.Pure electricity
Wheel hub is plated, the color and luster retention time is permanent, can say it is that valency of fine quality is high, the pure plating wheel hub of medium-to-high grade car multiselect.
The center of wheel hub needs to drill, and is all substantially five holes, and existing wheel hub bore process using first drilling, tie by drilling
Shu Houzai uniformly polishes, long processing time, inefficient, and during mass production, drill bit and grinding head continuous work continue
High temperature is kept, is easily damaged, cost allowance is big, and can generate a large amount of powdery clast during polishing, is easily sprinkling upon surrounding or waves
Into air, working environment is influenced, worker's health can also be influenced by worker's sucking.
Utility model content
In view of the deficiencies of the prior art, the utility model provides a kind of aluminium alloy wheel hub drilling equipment, solves subdrilling
Hole is polished again, long processing time, inefficient, and during mass production, drill bit and grinding head continuous work persistently keep high temperature,
A large amount of powdery clast can be generated when being easily damaged, and polishing, surrounding is easily sprinkling upon or waves into air, influence building ring
Border, by worker sucking can also influence worker's health the problem of.
In order to achieve the above object, the utility model is achieved by the following technical programs：A kind of aluminium alloy wheel hub drilling
Device, including babinet and clamping device, the inside of the babinet is fixedly connected with organic block, the upper end of the engine base from left to right according to
It is secondary to be installed with the first motor and water pump, the upper right corner of the cabinets cavity and water tank is offered above engine base, institute
The centre for stating cabinets cavity offers Processing Room, and the bottom of the cabinets cavity offers cesspool, the first motor output
The front end of axis is installed with first gear, and the first gear is mutually nibbled with the hollow rack being fixedly mounted at the top of shaft
It closes, the hollow rack is slidably connected by sliding sleeve with the guide post being fixedly mounted at the top of cabinets cavity, the bottom end of the shaft
It is rotatablely connected, is fixedly connected at the top of the bottom end of the hollow shaft and cabinet, the surface of the hollow shaft with the top of hollow shaft
It is from left to right installed with the first motor housing and hydraulic telescopic rod successively, bottom end and the cabinet inside of the hydraulic telescopic rod are slided
The top of second motor housing of dynamic connection is fixedly connected.
Preferably, the inside of first motor housing and the second motor housing is installed with the second motor and third electricity respectively
Machine, the top of second motor output shaft are installed with second gear, and the second gear is fixedly mounted with shaft surface
Third gear intermeshing.
Preferably, the inside of the cabinet and the 4th motor is installed on the left of the second motor housing, described the
The output shaft of three motors and the 4th motor is fixedly connected with grinding head and drill bit by connector respectively, and the top of the cabinet is consolidated
Dingan County is equipped with Bidirectional spray head.
Preferably, the inlet and outlet of the water pump have been respectively communicated with drinking-water pipe and drainpipe, and the drinking-water pipe is remote
One end from water pump runs through the left wall of water tank and extends to the bottom of water tank, and the one end of the drainpipe far from water pump sequentially passes through
Hollow rack, shaft, hollow shaft and cabinet are connected with Bidirectional spray head.
Preferably, the clamping device includes clamping plate, and the sliding slot that the inside of the clamping plate and Processing Room bottom plate opens up slides
Connection, the clamping plate are fixedly connected close to one end of wall box by spring with the side wall of babinet, the intrados of the clamping plate
Antiskid rubber is fixedly connected with, there are two the clamping device settings, and the central symmetry about Processing Room is distributed.
Preferably, the Processing Room bottom plate offers osculum, and filler, the sewage are offered at the top of the water tank
The both sides of pond intracavity bottom are inclined to set, and angle of inclination is 5 ° -10 °, and the center of the cesspool bottom is communicated with blowdown
Pipe, and valve is provided on blow-off pipe.
Preferably, the front of the babinet and chamber door, and the right end and case of chamber door are provided with immediately ahead of the Processing Room
Body is hinged by hinge, and the center of the chamber door is installed with windowpane.
Advantageous effect
The utility model provides a kind of aluminium alloy wheel hub drilling equipment.Has following advantageous effect：
(1), the aluminium alloy wheel hub drilling equipment is lifted the second motor housing and grinding head by hydraulic telescopic rod, first
Motor drives first gear rotation, and then cabinet is driven to decline, and then decline drill bit by intermeshing hollow rack, together
When the 4th motor drive drilling bit high-speed rotation, drill to wheel hub, after first hole drill is good, the first motor, which rotates backward, to be bored
Head lifts, and then the second motor drives second gear rotation, and second gear is engaged with third gear makes hollow shaft drive cabinet phase
72 ° are rotated for shaft, hydraulic telescopic rod falls grinding head, and the first motor rotates forward, and makes drill bit and grinding head at present
Drop, drill bit bore second hole, first hole of grinding head polishing, and drilled hole polishing is carried out at the same time, saves process time, improve efficiency.
(2), the aluminium alloy wheel hub drilling equipment is drawn water by water pump from water tank, by sequentially passing through hollow rack, turning
The drainpipe of axis, hollow shaft and cabinet sprays water from Bidirectional spray head, water is made to spray to drill bit and grinding head simultaneously, water spray can rush
Brush metal fragment ensures that it will not be drifted, while can cool down to drill bit and grinding head, extends the practical longevity of drill bit and grinding head
Life, reduces the loss of cost.
(3), aluminium alloy wheel hub drilling equipment, by offering osculum, and in Processing Room in the bottom plate of Processing Room
Lower section sets cesspool, the sewage for being mixed with metal fragment is made to be flowed into cesspool by osculum, the bottom of cesspool is set as
Inclined surface focuses on centre, and discharge by blow-off pipe convenient for metal fragment.
(4), the aluminium alloy wheel hub drilling equipment, by setting chamber door in the front end of Processing Room, convenient for picking and placeing workpiece, and
It can stop that fine grinding splashes out, and windowpane is provided on the surface of chamber door, convenient for observing machining status.
Description of the drawings
FIG. 1 is a schematic structural view of the utility model；
Fig. 2 is the utility model appearance diagram；
Fig. 3 is the utility model partial side view；
Fig. 4 is the utility model partial top view；
Fig. 5 is the utility model clamping plate sectional view.
In figure：1 babinet, 2 engine bases, 3 first motors, 4 clamping devices, 41 clamping plates, 42 sliding slots, 43 springs, 44 antiskid rubbers,
It is 5 water pumps, 6 water tanks, 7 Processing Rooms, 8 cesspools, 9 first gears, 10 shafts, 11 hollow racks, 12 sliding sleeves, 13 guide posts, 14 hollow
Axis, 15 cabinets, 16 first motor housings, 17 hydraulic telescopic rods, 18 second motor housings, 19 second motors, 20 third motors, 21 second
Gear, 22 third gears, 23 the 4th motors, 24 grinding heads, 25 drill bits, 26 Bidirectional spray heads, 27 drinking-water pipes, 28 drainpipes, 29 rows
Water hole, 30 filler, 31 blow-off pipes, 32 chamber doors, 33 windowpanes.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that the described embodiments are only a part of the embodiments of the utility model rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained shall fall within the protection scope of the present invention.
- 5 are please referred to Fig.1, the utility model provides a kind of technical solution：A kind of aluminium alloy wheel hub drilling equipment, including case
Body 1 and clamping device 4, the front of babinet 1 and are provided with chamber door 32 positioned at the front of Processing Room 7, and the right end of chamber door 32 with
Babinet 1 is hinged by hinge, and the center of chamber door 32 is installed with windowpane 33, and clamping device 4 includes clamping plate 41, clamping plate 41 with
The sliding slot 42 that the inside of 7 bottom plate of Processing Room opens up is slidably connected, and clamping plate 41 passes through spring 43 and case close to one end of 1 side wall of babinet
The side wall of body 1 is fixedly connected, and spring 43, the intrados of clamping plate 41 to be fixedly connected with skid-proof rubber there are two settings on each clamping plate 41
Pad 44 prevents hub rotation, and there are two the settings of clamping device 4, and the central symmetry about Processing Room 7 is distributed, the inside of babinet 1
Organic block 2 is fixedly connected with, the upper end of engine base 2 is from left to right installed with the first motor 3 and water pump 5, the water inlet of water pump 5 successively
Mouthful and water outlet be respectively communicated with drinking-water pipe 27 and drainpipe 28, drainpipe 28 is hose, the one end of drinking-water pipe 27 far from water pump 5
Through water tank 6 left wall and extend to the bottom of water tank 6, the one end of drainpipe 28 far from water pump 5 sequentially pass through hollow rack 11,
Shaft 10, hollow shaft 14 and cabinet 15 are connected with Bidirectional spray head 26, are drawn water from water tank 6 by water pump 5, by sequentially passing through sky
Heart rack 11, shaft 10, hollow shaft 14 and cabinet 15 drainpipe 28 water is sprayed from Bidirectional spray head 26, water is made to spray to brill simultaneously
First 25 and grinding head 24, water spray can wash away metal fragment, ensure that it will not be drifted, while can be to drill bit 25 and grinding head 24
Cooling extends the physical life of drill bit 25 and grinding head 24, reduces the loss of cost, the upper right corner of 1 inner cavity of babinet and positioned at machine
The top of seat 2 offers water tank 6, and the centre of 1 inner cavity of babinet offers Processing Room 7, and 7 bottom plate of Processing Room offers osculum 29,
The top of water tank 6 offers filler 30, and the both sides of 8 intracavity bottom of cesspool are inclined to set, and angle of inclination is 5 ° -10 °,
The center of 8 bottom of cesspool is communicated with blow-off pipe 31, and is provided with valve on blow-off pipe 31, by being opened in the bottom plate of Processing Room 7
Cesspool 8 is set equipped with osculum 29, and in the lower section of Processing Room 7, the sewage for being mixed with metal fragment is made to pass through osculum 29 and is flowed
Enter in cesspool 8, the bottom of cesspool 8 is set as inclined surface, and centre is focused on convenient for metal fragment, and passes through 31 row of blow-off pipe
Go out, by setting chamber door 32 in the front end of Processing Room 7, convenient for picking and placeing workpiece, and can stop that fine grinding splashes out, and in chamber door 32
Surface be provided with windowpane 33, convenient for observe machining status, the bottom of 1 inner cavity of babinet offers cesspool 8, the first motor 3
The front end of output shaft is installed with first gear 9, first gear 9 and 11 phase of hollow rack for being fixedly mounted on 10 top of shaft
Mutually engagement, hollow rack 11 are slidably connected by sliding sleeve 12 with being fixedly mounted on the guide post 13 of 1 inner cavity top of babinet, shaft 10
The top of bottom end and hollow shaft 14 is rotatablely connected, and the bottom end of hollow shaft 14 is fixedly connected with the top of cabinet 15, cabinet 15 it is interior
Portion and the 4th motor 23 is installed with positioned at the left side of the second motor housing 18, between the output shaft of the 4th motor 23 and cabinet 15
Waterproof washer is provided with, the output shaft of 20 and the 4th motor 23 of third motor is fixedly connected with grinding head 24 by connector respectively
With drill bit 25, the top of cabinet 15 is installed with Bidirectional spray head 26, and the surface of hollow shaft 14 is from left to right fixedly mounted successively
There are the first motor housing 16 and hydraulic telescopic rod 17, lifted the second motor housing 18 and grinding head 24 by hydraulic telescopic rod 17, the
One motor 3 drives first gear 9 to rotate, and then cabinet 15 is driven to decline, and then make brill by intermeshing hollow rack 11
First 25 decline, while the 4th motor 23 drives 25 high-speed rotation of drill bit, drills to wheel hub, after first hole drill is good, first
Motor 3, which rotates backward, lifts drill bit 25, and then the second motor 19 drives second gear 21 to rotate, second gear 21 and third tooth
22 engagement of wheel makes hollow shaft 14 that cabinet 15 be driven to rotate 72 ° relative to shaft 10, and hydraulic telescopic rod 17 falls grinding head 24, the
One motor 3 rotates forward, and simultaneously declines drill bit 25 and grinding head 24, and drill bit 25 bores second hole, the polishing of grinding head 24 first
A hole, drilled hole polishing are carried out at the same time, and save process time, improve the inside of efficiency, the first motor housing 16 and the second motor housing 18
It is installed with the second motor 19 and third motor 20 respectively, is set between the output shaft of third motor 20 and the second motor housing 18
There is waterproof washer, the angle between 20 and the 4th motor 2 of third motor and hollow shaft 14 is 72 °, 19 output shaft of the second motor
Top is installed with second gear 21, and the third gear 22 that second gear 21 is fixedly mounted with 10 surface of shaft is intermeshed,
The top of the second motor housing 18 that the bottom end of hydraulic telescopic rod 17 is connect with 15 internal slide of cabinet is fixedly connected.
During work, water is added in into water tank 6, chamber door 32 is opened, clamping plate 41 to both sides is pushed open, wheel hub is placed on clamping plate 41
Between, chamber door 32 is then shut, hydraulic telescopic rod 17 lifts the second motor housing 18 and grinding head 24, and the first motor 3 drives the
One gear 9 rotates, and then cabinet 15 is driven to decline, and then decline drill bit 25 by intermeshing hollow rack 11, simultaneously
4th motor 23 drives 25 high-speed rotation of drill bit, drills to wheel hub, after first hole drill is good, the first motor 3 rotates backward
Drill bit 25 is lifted, then the second motor 19 drives second gear 21 to rotate, and second gear 21 is engaged with third gear 22 makes sky
Mandrel 14 drives cabinet 15 to rotate 72 ° relative to shaft 10, and hydraulic telescopic rod 17 falls grinding head 24, and the first motor 3 is positive
Rotation, simultaneously declines drill bit 25 and grinding head 24, and drill bit 25 bores second hole, first hole of the polishing of grinding head 24, while water
Pump 5 draws water from water tank 6, by sequentially passing through the drainpipe 28 of hollow rack 11, shaft 10, hollow shaft 14 and cabinet 15 by water
It is sprayed from Bidirectional spray head 26, water is made to spray to drill bit 25 and grinding head 24 simultaneously, metal fragment is flushed in cesspool 8 by flow, fixed
Phase opens valve discharge sewage, and after processing all holes successively, closing machine opens chamber door 32 and takes out wheel hub.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any this practical relationship or sequence.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed or further include as this process, method, article or equipment
Intrinsic element.In the absence of more restrictions.By sentence " element limited including one ..., it is not excluded that
Also there are other identical elements in the process, method, article or apparatus that includes the element ".
While there has been shown and described that the embodiment of the utility model, for the ordinary skill in the art,
It is appreciated that can these embodiments be carried out with a variety of variations in the case of the principle and spirit for not departing from the utility model, repaiied
Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (7)
1. a kind of aluminium alloy wheel hub drilling equipment, including babinet (1) and clamping device (4), it is characterised in that：The babinet (1)
Inside be fixedly connected with organic block (2), the upper end of the engine base (2) be from left to right installed with successively the first motor (3) and
Water pump (5), the upper right corner of babinet (1) inner cavity and offers water tank (6) above the engine base (2), in the babinet (1)
The centre of chamber offers Processing Room (7), and the bottom of babinet (1) inner cavity offers cesspool (8), first motor (3)
The front end of output shaft is installed with first gear (9), the first gear (9) and the sky being fixedly mounted at the top of shaft (10)
Heart rack (11) is intermeshed, and the hollow rack (11) is by sliding sleeve (12) and is fixedly mounted on babinet (1) inner cavity top
Guide post (13) is slidably connected, and the bottom end of the shaft (10) is rotatablely connected with the top of hollow shaft (14), the hollow shaft (14)
Bottom end and cabinet (15) at the top of be fixedly connected, the surface of the hollow shaft (14) is from left to right installed with first successively
Motor housing (16) and hydraulic telescopic rod (17), the bottom end of the hydraulic telescopic rod (17) connect with cabinet (15) internal slide
The top of two motor housings (18) is fixedly connected.
2. a kind of aluminium alloy wheel hub drilling equipment according to claim 1, it is characterised in that：First motor housing (16)
It is installed with the second motor (19) and third motor (20), second motor respectively with the inside of the second motor housing (18)
(19) top of output shaft is installed with second gear (21), and the second gear (21) is fixedly mounted with shaft (10) surface
Third gear (22) intermeshing.
3. a kind of aluminium alloy wheel hub drilling equipment according to claim 2, it is characterised in that：The inside of the cabinet (15)
And the 4th motor (23) is installed on the left of the second motor housing (18), the third motor (20) and the 4th motor
(23) output shaft is fixedly connected with grinding head (24) and drill bit (25), the top of the cabinet (15) by connector respectively
It is installed with Bidirectional spray head (26).
4. a kind of aluminium alloy wheel hub drilling equipment according to claim 1, it is characterised in that：The water inlet of the water pump (5)
Mouth and water outlet have been respectively communicated with drinking-water pipe (27) and drainpipe (28), and the one end of the drinking-water pipe (27) far from water pump (5) is passed through
It wears the left wall of water tank (6) and extends to the bottom of water tank (6), the one end of the drainpipe (28) far from water pump (5) sequentially passes through
Hollow rack (11), shaft (10), hollow shaft (14) and cabinet (15) are connected with Bidirectional spray head (26).
5. a kind of aluminium alloy wheel hub drilling equipment according to claim 1, it is characterised in that：Clamping device (4) packet
Include clamping plate (41), the sliding slot (42) that the inside of the clamping plate (41) and Processing Room (7) bottom plate opens up is slidably connected, the clamping plate
(41) be fixedly connected close to one end of babinet (1) side wall by spring (43) with the side wall of babinet (1), the clamping plate (41) it is interior
Cambered surface is fixedly connected with antiskid rubber (44), and there are two clamping device (4) settings, and about the center pair of Processing Room (7)
Claim distribution.
6. a kind of aluminium alloy wheel hub drilling equipment according to claim 1, it is characterised in that：Processing Room (7) bottom plate
Osculum (29) is offered, offers filler (30) at the top of the water tank (6), the two of cesspool (8) intracavity bottom
Side is inclined to set, and angle of inclination is 5 ° -10 °, and the center of cesspool (8) bottom is communicated with blow-off pipe (31), and arrange
Valve is provided on dirt pipe (31).
7. a kind of aluminium alloy wheel hub drilling equipment according to claim 1, it is characterised in that：The front of the babinet (1)
And chamber door (32) is provided with, and the right end of chamber door (32) is hinged with babinet (1) by hinge immediately ahead of Processing Room (7),
The center of the chamber door (32) is installed with windowpane (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721269035.0U CN207534342U (en) | 2017-09-29 | 2017-09-29 | A kind of aluminium alloy wheel hub drilling equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721269035.0U CN207534342U (en) | 2017-09-29 | 2017-09-29 | A kind of aluminium alloy wheel hub drilling equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207534342U true CN207534342U (en) | 2018-06-26 |
Family
ID=62609901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721269035.0U Expired - Fee Related CN207534342U (en) | 2017-09-29 | 2017-09-29 | A kind of aluminium alloy wheel hub drilling equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207534342U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107498316A (en) * | 2017-09-29 | 2017-12-22 | 安吉安畅道路施救服务有限公司 | A kind of aluminium alloy wheel hub drilling equipment |
| CN113103008A (en) * | 2021-04-15 | 2021-07-13 | 南通德元机械制造有限公司 | Machining method of high-precision sealing hole |
-
2017
- 2017-09-29 CN CN201721269035.0U patent/CN207534342U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107498316A (en) * | 2017-09-29 | 2017-12-22 | 安吉安畅道路施救服务有限公司 | A kind of aluminium alloy wheel hub drilling equipment |
| CN113103008A (en) * | 2021-04-15 | 2021-07-13 | 南通德元机械制造有限公司 | Machining method of high-precision sealing hole |
| CN113103008B (en) * | 2021-04-15 | 2022-01-28 | 南通德元机械制造有限公司 | Machining method of high-precision sealing hole |
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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: 20180626 Termination date: 20180929 |
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| CF01 | Termination of patent right due to non-payment of annual fee |