CN110509159A - A kind of machine components grinding device - Google Patents
A kind of machine components grinding device Download PDFInfo
- Publication number
- CN110509159A CN110509159A CN201910744637.4A CN201910744637A CN110509159A CN 110509159 A CN110509159 A CN 110509159A CN 201910744637 A CN201910744637 A CN 201910744637A CN 110509159 A CN110509159 A CN 110509159A
- Authority
- CN
- China
- Prior art keywords
- fixedly installed
- workbench
- screw rod
- slide unit
- lead screw
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0007—Movable machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/0015—Hanging grinding machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B27/00—Other grinding machines or devices
- B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/10—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces
- B24B47/12—Drives or gearings; Equipment therefor for rotating or reciprocating working-spindles carrying grinding wheels or workpieces by mechanical gearing or electric power
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The present invention relates to part grinding technology fields, in particular a kind of machine components grinding device, including workbench, the top of the workbench is fixedly installed fixing support rack, the upper end middle of the fixing support rack is fixedly connected with motor lead screw mechanism, the screw rod is connected and fixed seat by screw rod and is fixedly connected with the first stepper motor, the second stepper motor is fixedly installed polishing main shaft, the polishing main shaft is fixedly installed part grinding head far from one end of second stepper motor, the top middle of the workbench is fixedly installed air-actuated jaw, it can be improved the mobile accuracy of second stepper motor by motor lead screw mechanism, control the contact surface and contact distance of part grinding head and part of polishing, improve the precision of part grinding head polishing part, and the surface for the part that gets rusty can be removed by replacing to part grinding head Rust, motor lead screw mechanism can be improved the precision integrally polished, and improve the success rate of polishing, reduce the damage of part polishing.
Description
Technical field
The present invention relates to part grinding technology field, specially a kind of machine components grinding device.
Background technique
Polishing, is one kind of process for modifying surface, refers generally to by the rough object (sand paper containing higher hardness particle
Deng) come by friction change material surface physical property a kind of processing method, main purpose is thick in order to obtain particular surface
Rugosity, it is to constitute mechanical primary element that machine components (machine element), which are also known as mechanical organ (machine part),
It is the mechanical single product that can not be decoupled with machine of composition, after formation, there are burr or out-of-flatnesses on surface for machine components
Place, need the later period polish, keep the surface of machine components more smooth, specification needed for laminating production, Huo Zhe
Perhaps, machine components, which get rusty, in the use in later period carries out polishing derusting.
Existing machine components not enough will cause the damage of machine components due to the precision of grinding device during the grinding process,
It influences the service life of machine components or keeps part directly discarded, cause a large amount of waste, it is therefore desirable to a kind of machine components
Grinding device makes improvement to the above problem.
Summary of the invention
The purpose of the present invention is to provide a kind of machine components grinding devices, to solve mentioned above in the background art ask
Topic.
To achieve the above object, the invention provides the following technical scheme:
A kind of machine components grinding device, including workbench, the bottom end of the workbench is fixedly installed movable pulley, described
The top of workbench is fixedly installed fixing support rack, and the upper end middle of the fixing support rack is fixedly connected with motor lead screw
Mechanism is fixedly installed the first sliding rail on the left of the motor lead screw mechanism, and the motor lead screw mechanism is far from the first sliding rail
Side is fixedly installed the second sliding rail, and the downside middle of the motor lead screw mechanism is fixedly installed screw rod fixing seat, described
Motor lead screw mechanism is fixedly connected with screw rod far from one end of screw rod fixing seat and is connected and fixed seat, the screw rod be connected and fixed seat and
Screw rod fixing seat is fixedly connected with screw rod, and the screw rod is socketed with slide unit connection pedestal, and the slide unit connection pedestal is fixedly connected
There is slide unit, the slide unit connect pedestal with slide unit and connects footstock connection, first sliding rail and the second sliding rail and cunning by slide unit
The junction of platform is fixedly installed sliding block, and the screw rod is connected and fixed seat by screw rod and is fixedly connected with the first stepper motor, institute
The top middle for stating slide unit is fixedly connected with second stepper motor, and the second stepper motor is fixedly installed polishing main shaft,
The polishing main shaft is fixedly installed part grinding head far from one end of second stepper motor, and the workbench is provided with double open
Door, the double door are connect by hinge with workbench, and the top middle of the workbench is fixedly installed air-actuated jaw, institute
The top left hand for stating air-actuated jaw is fixedly installed part fixed plate, and the top left hand of the air-actuated jaw is fixedly installed gas
Cylinder, the cylinder are fixedly installed push rod, and the push rod is fixedly installed part clamping plate far from one end of cylinder, described pneumatic
Cylinder control handle is fixedly installed on the right side of fixture, the right side upper end of the workbench is fixedly installed motor lead screw control rotation
Button is fixedly installed start key on the downside of the motor lead screw control handle.
Preferably, the motor lead screw mechanism is connect by fixing bolt with fixing support rack.
Preferably, first stepper motor uses 42BYG009 model, and the second stepper motor is using HM314 series
Model.
Preferably, the cylinder uses MHL2 model.
Preferably, the sliding block is provided with 4, and the sliding block and the first sliding rail, the second sliding rail are clamped, and the sliding block passes through
Setscrew is connect with slide unit.
Preferably, the screw rod is connect by shaft joint with the first stepper motor.
Preferably, the hollow setting of the workbench, the workbench are internally provided with power supply box.
Compared with prior art, the beneficial effects of the present invention are:
1, it in the present invention, can be improved the mobile accuracy of second stepper motor by the motor lead screw mechanism of setting, control
The contact surface and contact distance of part grinding head and polishing part, improve the precision of part grinding head polishing part, and to zero
Part grinding head, which carries out replacement, to derust to the surface for the part that gets rusty, and motor lead screw mechanism can be improved the essence integrally polished
Degree improves the success rate of part polishing, reduces the damage of machine components polishing.
2, in the present invention, polishing part can be fixed by the air-actuated jaw of setting, during avoiding polishing,
Polishing part shifts, and part grinding head causes polishing to damage part, improves the precision and success rate of device polishing.
Detailed description of the invention
Fig. 1 is the whole main view of the present invention；
Fig. 2 is motor lead screw mechanism of the present invention explosive view；
Fig. 3 is air-actuated jaw top view of the present invention.
In figure: 1- workbench, 2- movable pulley, 3- fixing support rack, 4- motor lead screw mechanism, the first sliding rail of 5-, 6- second
Sliding rail, 7- screw rod fixing seat, 8- screw rod are connected and fixed seat, 9- screw rod, 10- slide unit connection pedestal, 11- slide unit, the connection of 12- slide unit
Footstock, 13- sliding block, the first stepper motor of 14-, 15- second stepper motor, 16- polishing main shaft, 17- part grinding head, 18- are bis-
Enabling, 19- air-actuated jaw, 20- part fixed plate, 21- cylinder, 22- push rod, 23- part clamping plate, 24- cylinder control handle,
25- motor lead screw control handle, 26- start key.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments, is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1-3 is please referred to, the present invention provides a kind of technical solution:
A kind of machine components grinding device, including workbench 1, the bottom end of workbench 1 are fixedly installed movable pulley 2, work
The top of platform 1 is fixedly installed fixing support rack 3, and the upper end middle of fixing support rack 3 is fixedly connected with motor lead screw mechanism
4, the left side of motor lead screw mechanism 4 is fixedly installed the first sliding rail 5, and motor lead screw mechanism 4 is fixed far from the side of the first sliding rail 5
It is provided with the second sliding rail 6, the downside middle of motor lead screw mechanism 4 is fixedly installed screw rod fixing seat 7, motor lead screw mechanism 4
One end far from screw rod fixing seat 7 is fixedly connected with screw rod and is connected and fixed seat 8, and screw rod is connected and fixed seat 8 and screw rod fixing seat 7 is solid
Surely it is connected with screw rod 9, screw rod 9 is socketed with slide unit connection pedestal 10, and slide unit connection pedestal 10 is fixedly connected with slide unit 11, slide unit 11
It is solid that the junction that pedestal 10 connects the connection of footstock 12, the first sliding rail 5 and the second sliding rail 6 and slide unit 11 by slide unit is connect with slide unit
Surely it is provided with sliding block 13, screw rod 9 is connected and fixed seat 8 by screw rod and is fixedly connected with the first stepper motor 14, the top of slide unit 11
Middle is fixedly connected with second stepper motor 15, and second stepper motor 15 is fixedly installed polishing main shaft 16, main shaft 16 of polishing
One end far from second stepper motor 15 is fixedly installed part grinding head 17, and workbench 1 is provided with double door 18, double door 18
It is connect by hinge with workbench 1, the top middle of workbench 1 is fixedly installed air-actuated jaw 19, the top of air-actuated jaw 19
End left side is fixedly installed part fixed plate 20, and the top left hand of air-actuated jaw 19 is fixedly installed cylinder 21, and cylinder 21 is fixed
It is provided with push rod 22, push rod 22 is fixedly installed part clamping plate 23 far from one end of cylinder 21, and the right side of air-actuated jaw 19 is solid
Surely it is provided with cylinder control handle 24, the right side upper end of workbench 1 is fixedly installed motor lead screw control handle 25, motor lead screw
The downside of control handle 25 is fixedly installed start key 26, can be improved the second stepping electricity by the motor lead screw mechanism 4 of setting
The contact surface and contact distance of the mobile accuracy of machine 15, control part grinding head 17 and part of polishing, improve part grinding head 17
The precision of polishing part, and part grinding head 17 is replaced and can be derusted to the surface for the part that gets rusty, motor silk
Linkage 4 can be improved the precision integrally polished, and improve the success rate of part polishing, reduce the damage of machine components polishing, lead to
Polishing part can be fixed for the air-actuated jaw 19 for crossing setting, and during avoiding polishing, polishing part shifts, and zero
Part grinding head 17 causes polishing to damage part, improves the precision and success rate of device polishing.
Workflow of the present invention: in use, by 26 starter of start key, by that will polish, part is put into air-actuated jaw
19, cylinder 21 is controlled by cylinder control handle 24 and is run, controlling part clamping plate 23 by push rod 22 will polishing part and zero
Part fixed plate 20 clamps, and controls the first stepper motor 14 by motor lead screw control handle 25 and screw rod 9 is driven to run, pass through screw rod
9 drive slide units 11 are run on the first sliding rail 5 and the second sliding rail 6 reaches control 15 falling head of second stepper motor, passes through silk
The operation control control part grinding head 17 of bar 9 and the contact surface for part of polishing and contact distance, improve part grinding head 17 and beat
The precision of part is ground, and part grinding head 17 is replaced and can be derusted to the surface for the part that gets rusty, motor lead screw
Mechanism 4 can be improved the precision integrally polished, and improve the success rate of part polishing, reduces the damage of machine components polishing, passes through
Polishing part can be fixed for air-actuated jaw 19, and during avoiding polishing, polishing part shifts, part grinding head
17 pairs of parts cause polishing to damage, and improve the precision and success rate of device polishing.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of machine components grinding device, including workbench (1), it is characterised in that: the bottom end fixation of the workbench (1) is set
It is equipped with movable pulley (2), the top of the workbench (1) is fixedly installed fixing support rack (3), the fixing support rack (3)
Upper end middle is fixedly connected with motor lead screw mechanism (4), and it is sliding that first is fixedly installed on the left of the motor lead screw mechanism (4)
Rail (5), the motor lead screw mechanism (4) are fixedly installed the second sliding rail (6), the motor far from the side of the first sliding rail (5)
The downside middle of screw body (4) is fixedly installed screw rod fixing seat (7), and the motor lead screw mechanism (4) is solid far from screw rod
One end of reservation (7) is fixedly connected with screw rod and is connected and fixed seat (8), and the screw rod is connected and fixed seat (8) and screw rod fixing seat (7)
It is fixedly connected with screw rod (9), the screw rod (9) is socketed with slide unit connection pedestal (10), and slide unit connection pedestal (10) is fixed
It being connected with slide unit (11), the slide unit (11) connect pedestal (10) with slide unit by slide unit connection footstock (12) connection, and described the
The junction of one sliding rail (5) and the second sliding rail (6) and slide unit (11) is fixedly installed sliding block (13), and the screw rod (9) passes through silk
Bar is connected and fixed seat (8) and is fixedly connected with the first stepper motor (14), and the top middle of the slide unit (11) is fixedly connected with
Second stepper motor (15), the second stepper motor (15) are fixedly installed polishing main shaft (16), the polishing main shaft (16)
One end far from second stepper motor (15) is fixedly installed part grinding head (17), and the workbench (1) is provided with double door
(18), the double door (18) is connect by hinge with workbench (1), the top middle fixed setting of the workbench (1)
Have air-actuated jaw (19), the top left hand of the air-actuated jaw (19) is fixedly installed part fixed plate (20), the pneumatic clamps
The top left hand of tool (19) is fixedly installed cylinder (21), and the cylinder (21) is fixedly installed push rod (22), the push rod
(22) one end far from cylinder (21) is fixedly installed part clamping plate (23), the right side fixed setting of the air-actuated jaw (19)
Have cylinder control handle (24), the right side upper end of the workbench (1) is fixedly installed motor lead screw control handle (25), described
Start key (26) are fixedly installed on the downside of motor lead screw control handle (25).
2. a kind of machine components grinding device according to claim 1, it is characterised in that: the motor lead screw mechanism (4)
It is connect by fixing bolt with fixing support rack (3).
3. a kind of machine components grinding device according to claim 1, it is characterised in that: first stepper motor (14)
Using 42BYG009 model, the second stepper motor (15) uses HM314 serial model No..
4. a kind of machine components grinding device according to claim 1, it is characterised in that: the cylinder (21) uses MHL2
Model.
5. a kind of machine components grinding device according to claim 1, it is characterised in that: the sliding block (13) is provided with 4
A, the sliding block (13) and the first sliding rail (5), the second sliding rail (6) are clamped, and the sliding block (13) passes through setscrew and slide unit
(11) it connects.
6. a kind of machine components grinding device according to claim 1, it is characterised in that: the screw rod (9) passes through connecting shaft
Device is connect with the first stepper motor (14).
7. a kind of machine components grinding device according to claim 1, it is characterised in that: the workbench (1) is hollow to be set
It sets, the workbench (1) is internally provided with power supply box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910744637.4A CN110509159A (en) | 2019-08-13 | 2019-08-13 | A kind of machine components grinding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910744637.4A CN110509159A (en) | 2019-08-13 | 2019-08-13 | A kind of machine components grinding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110509159A true CN110509159A (en) | 2019-11-29 |
Family
ID=68624915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910744637.4A Pending CN110509159A (en) | 2019-08-13 | 2019-08-13 | A kind of machine components grinding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110509159A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112276692A (en) * | 2020-10-11 | 2021-01-29 | 嘉兴勤慎智能技术有限公司 | Automatic grinding equipment for shaft part production |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08243909A (en) * | 1995-03-08 | 1996-09-24 | Hitachi Metals Ltd | Deburring device for aluminum wheel and positioning jig |
| CN101659028A (en) * | 2009-09-03 | 2010-03-03 | 常熟市建华模具有限责任公司 | Polishing machine of glass mold |
| CN107953199A (en) * | 2017-12-22 | 2018-04-24 | 浙江利永达制冷机械有限公司 | A kind of valve sanding apparatus |
| CN207358806U (en) * | 2017-09-14 | 2018-05-15 | 安吉圆磨机械科技有限公司 | A kind of double bistrique double-workbench vertical shaft buck surface grinding machines |
| CN207696046U (en) * | 2018-01-04 | 2018-08-07 | 四川省德阳博益磁性材料有限公司 | A kind of soft magnetic ferrite polishing drilling equipment |
| CN207746904U (en) * | 2017-11-19 | 2018-08-21 | 姜堰区杰***仪器厂 | A kind of automatic sheet grinding machine for rock mine sample |
| CN108942630A (en) * | 2018-07-26 | 2018-12-07 | 嘉善安必兴精密机械有限公司 | A kind of burnishing device of bearing outer ring |
| CN209021816U (en) * | 2018-09-18 | 2019-06-25 | 上海松韬自动化设备有限公司 | A kind of metal product grinding device convenient for chip removal |
| CN209223775U (en) * | 2018-12-21 | 2019-08-09 | 深圳市三大金属有限公司 | A kind of numerical control optical profile grinder |
-
2019
- 2019-08-13 CN CN201910744637.4A patent/CN110509159A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08243909A (en) * | 1995-03-08 | 1996-09-24 | Hitachi Metals Ltd | Deburring device for aluminum wheel and positioning jig |
| CN101659028A (en) * | 2009-09-03 | 2010-03-03 | 常熟市建华模具有限责任公司 | Polishing machine of glass mold |
| CN207358806U (en) * | 2017-09-14 | 2018-05-15 | 安吉圆磨机械科技有限公司 | A kind of double bistrique double-workbench vertical shaft buck surface grinding machines |
| CN207746904U (en) * | 2017-11-19 | 2018-08-21 | 姜堰区杰***仪器厂 | A kind of automatic sheet grinding machine for rock mine sample |
| CN107953199A (en) * | 2017-12-22 | 2018-04-24 | 浙江利永达制冷机械有限公司 | A kind of valve sanding apparatus |
| CN207696046U (en) * | 2018-01-04 | 2018-08-07 | 四川省德阳博益磁性材料有限公司 | A kind of soft magnetic ferrite polishing drilling equipment |
| CN108942630A (en) * | 2018-07-26 | 2018-12-07 | 嘉善安必兴精密机械有限公司 | A kind of burnishing device of bearing outer ring |
| CN209021816U (en) * | 2018-09-18 | 2019-06-25 | 上海松韬自动化设备有限公司 | A kind of metal product grinding device convenient for chip removal |
| CN209223775U (en) * | 2018-12-21 | 2019-08-09 | 深圳市三大金属有限公司 | A kind of numerical control optical profile grinder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112276692A (en) * | 2020-10-11 | 2021-01-29 | 嘉兴勤慎智能技术有限公司 | Automatic grinding equipment for shaft part production |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108972264B (en) | Intelligent robot grinding and polishing system for grinding and polishing car door frame | |
| CN102729122B (en) | Double-headed grinder | |
| CN219465628U (en) | Rotary shaft end processing device | |
| CN110948298A (en) | Pipe grinding device | |
| CN109623587A (en) | A kind of robot polishing station | |
| CN109015152B (en) | Crankshaft polishing machine | |
| CN110509159A (en) | A kind of machine components grinding device | |
| CN106425726A (en) | Plastic slab polishing device | |
| CN109531357B (en) | Hardware workpiece finish machining device and operation method thereof | |
| CN209986722U (en) | Cambered surface polishing machine | |
| CN210588520U (en) | Building materials burr grinding device | |
| CN107900848A (en) | A kind of Communication Equipment processing sanding apparatus | |
| CN209551398U (en) | A kind of robot polishing station | |
| CN108942441A (en) | A kind of two-sided mill Pot devices | |
| CN105150066A (en) | Segment difference grinding machine | |
| CN212095780U (en) | Waterway valve processing device | |
| CN211517005U (en) | Optical lens for astronomical instrument and grinding equipment thereof | |
| CN210255420U (en) | A grinding device for drive shaft production | |
| CN211914426U (en) | NR inductance rubber coating tangent line all-in-one | |
| CN111822453A (en) | Environment-friendly acid washing-free machine | |
| CN111015493A (en) | Pipe polishing equipment | |
| CN216422144U (en) | High strength toughened glass surface polishing processing apparatus | |
| CN221020447U (en) | Aluminum plate polishing machine | |
| CN220740663U (en) | Plane polishing machine for elevator accessories | |
| CN220197259U (en) | Polishing device for machining |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191129 |
|
| WD01 | Invention patent application deemed withdrawn after publication |