CN208304148U - A kind of intelligence super laser cold welding machine - Google Patents
A kind of intelligence super laser cold welding machine Download PDFInfo
- Publication number
- CN208304148U CN208304148U CN201820855179.2U CN201820855179U CN208304148U CN 208304148 U CN208304148 U CN 208304148U CN 201820855179 U CN201820855179 U CN 201820855179U CN 208304148 U CN208304148 U CN 208304148U
- Authority
- CN
- China
- Prior art keywords
- board
- pedestal
- welding machine
- arm
- cold welding
- 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
- 238000003466 welding Methods 0.000 title claims abstract description 60
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000003892 spreading Methods 0.000 claims abstract description 21
- 230000007480 spreading Effects 0.000 claims abstract description 21
- 239000000428 dust Substances 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 238000003860 storage Methods 0.000 claims abstract description 13
- 239000004973 liquid crystal related substance Substances 0.000 claims description 9
- BVPWJMCABCPUQY-UHFFFAOYSA-N 4-amino-5-chloro-2-methoxy-N-[1-(phenylmethyl)-4-piperidinyl]benzamide Chemical compound COC1=CC(N)=C(Cl)C=C1C(=O)NC1CCN(CC=2C=CC=CC=2)CC1 BVPWJMCABCPUQY-UHFFFAOYSA-N 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 7
- 238000007789 sealing Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
A kind of intelligence super laser cold welding machine, including board, board is equipped with welding fixture, weldment, welding fixture includes the positioning mechanism and clamp system of two groups of mutual horizontal verticals, board surface is equipped with cushion block, and cushion block is between positioning mechanism and clamp system, weldment includes pedestal, rotating arm, spreading arm, laser head, pedestal connect with board and rotates along the central axis of pedestal, one end of rotating arm and the side of pedestal are hinged, one end of spreading arm and the other end of rotating arm are hinged, the connection of the other end of laser head and spreading arm is simultaneously rotated around tie point, board surface offers several chip spaces along the periphery of cushion block, chip removal pipeline is equipped in board, one end of chip removal pipeline is connected to chip space, the other end of chip removal pipeline is extended to outside board and is connected to a dust storage chamber, dust storage chamber is connected with suction ventilator.The utility model realizes the positioning and fixation of product by positioning mechanism and clamp system；It is realized by pedestal and control arm and is welded without dead angle；Clast is collected by chip space.
Description
Technical field
The utility model relates to technical field of laser welding, espespecially a kind of intelligent super laser cold welding machine.
Background technique
Laser welding is a kind of high-efficiency and precision welding method using the laser beam of high-energy density as heat source.Laser Welding
Connect be Materialbearbeitung mit Laserlicht technical application one of importance.The heating of laser beam welding category heat-conduction-type, i.e. laser emission
Workpiece surface, surface heat are internally spread by heat transfer, by control the width of laser pulse, energy, peak power and
The parameters such as repetition rate, melt workpiece, form specific molten bath.Due to its unique advantage, it has been successfully applied to micro-, small-sized
In the precision welding of part.But the laser welder being commonly used is due to the limitation by own mechanical control piece, it can not
Realize comprehensive no dead angle welding.
Having a procedure in the assembling process of sealed relay is the laser welding of sealing cover, with sealed relay product
Increasing, the sealed relay of different size and model, which need to be corresponded to when welding sealing cover using different welding fixtures, to be fixed, if
Production process is related to the welding of the relay of several different model sizes, then more renews folder after needing every welding to complete a kind of relay
Tool, labor intensity is big, and production efficiency is low.Therefore, the welding fixture of traditional one-to-one correspondence formula is unable to satisfy multi items, in small batches
The production requirement of amount.
Summary of the invention
The intelligence that one kind is easy to use to solve the above problems, the utility model provides, welding is comprehensive, practical is super sharp
Light cold welding machine.
A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: intelligent super laser cold welding machine, including machine
Platform, the board be equipped with welding fixture, weldment, the welding fixture include two groups of mutual horizontal verticals positioning mechanism and
Clamp system, the board surface is equipped with cushion block, and cushion block is between positioning mechanism and clamp system,
The weldment includes pedestal, rotating arm, spreading arm, laser head, and the pedestal connect with board and along pedestal
Central axis rotation, one end of the rotating arm and the side of pedestal are hinged, one end of the spreading arm and rotating arm it is another
End is hinged, and the other end connection of the laser head and spreading arm is simultaneously rotated around tie point,
The board surface offers several chip spaces along the periphery of cushion block, is equipped with chip removal pipeline, chip removal pipeline in board
One end be connected to chip space, it is outer and be connected to a dust storage chamber, the dust storage chamber company that the other end of chip removal pipeline extends to board
It is connected to suction ventilator, and the joint face of dust storage chamber and suction ventilator is equipped with dustproof filter screen.
Specifically, the clamp system includes support, guide sleeve, sliding block, and the guide sleeve is horizontally set on board by support
On, and guide sleeve is socketed in shoe surface, sliding block is moved along the extending direction of guide sleeve, and the both ends of sliding block extend to outside guide sleeve, sliding block
One end be connected with cylinder briquetting, the other end of sliding block is connected with transfer block, is removably equipped with sliding pressure on the pinboard
Plate.
Specifically, the positioning mechanism includes supporting plate, positioning plate, positioning pressuring plate, and the movement of sliding block is arranged in the supporting plate
On direction, the positioning pressuring plate is removably attached to the top of cardboard, and positioning pressuring plate and sliding clamp phase by positioning plate
It is right.
Specifically, the pedestal includes fixing seat, rotating seat, link block, and the fixing seat is installed on board, fixing seat
Top center be equipped with vertical shaft, the rotating seat is socketed in shaft surface, and the link block is installed in the top of rotating seat
End, the rotating arm are connect with link block.
Specifically, the rotating arm and spreading arm pass through fine motion motor control.
Specifically, the bottom end that the support is located at sliding block is equipped with support plate.
Specifically, the support is integrally U-shaped.
Specifically, the microprocessor for being equipped with weld assembly inside the board and being connect with weld assembly, the board
Side is additionally provided with control panel, and the control panel is equipped with the frequency connecting with microprocessor and adjusts component, duty cycle adjustment
Component, mode selecting key, weld interval adjust component.
Specifically, it includes liquid crystal frequency display window and two frequency adjusting keys that the frequency, which adjusts component,；The duty ratio
Adjusting component includes liquid crystal duty ratio display window and two duty cycle adjustment keys；It includes liquid crystal weldering that the weld interval, which adjusts component,
Connect time showing window and two weld interval adjusting keys.
The utility model has the beneficial effects that: the utility model realizes product by setting positioning mechanism and clamp system
Positioning and fixation, when needing to weld the product of another model, size, it is only necessary to replace corresponding sliding clamp and positioning pressure
Plate；Laser head and pedestal are connected by rotating arm and spreading arm, in the intelligent super laser cold welding machine course of work, pedestal can
Rotating arm is driven to realize that 360 degree of rotations, the hinged cooperation of both rotating arm and spreading arm are able to drive laser head and reach specified altitude assignment
And position, two control arms cooperate to realize no dead angle welding；The clast generated in welding process can be in suction ventilator
It under suction, is collected by chip space into dust storage chamber, is avoided pollution.
Detailed description of the invention
Fig. 1 is the overall schematic of the utility model；
Fig. 2 is the welding fixture schematic diagram of the utility model；
Fig. 3 is sectional view at A in Fig. 2；
Fig. 4 is the weldment schematic diagram of the utility model.
Drawing reference numeral explanation:
1. board；2. welding fixture；3. weldment；11. cushion block；211. support；212. guide sleeve；213. sliding block；214. gas
Cylinder briquetting；215. transfer block；216. sliding clamp；217. support plate;221. supporting plate；222. positioning plate；223. positioning pressuring plate；
31. pedestal；32. rotating arm；33. spreading arm；34. laser head；41. chip space；42. chip removal pipeline；43. dust storage chamber；44. air draught
Machine.
Specific embodiment
Please refer to Fig. 1-4, the utility model is about a kind of intelligent super laser cold welding machine, including board 1, on the board 1
Equipped with welding fixture 2, weldment 3, the welding fixture 2 includes the positioning mechanism and clamp system of two groups of mutual horizontal verticals,
1 surface of board is equipped with cushion block 11, and cushion block 11 is between positioning mechanism and clamp system.
Specifically, the clamp system includes support 211, guide sleeve 212, sliding block 213, and the guide sleeve 212 passes through support 211
It being horizontally set on board 1, and guide sleeve 212 is socketed in 213 surface of sliding block, sliding block 213 is moved along the extending direction of guide sleeve 212,
The both ends of sliding block 213 extend to outside guide sleeve 212, and one end of sliding block 213 is connected with cylinder briquetting 214, and the other end of sliding block 213 connects
It is connected to transfer block 215, is removably equipped with sliding clamp 216 on the pinboard.
The cylinder briquetting 214 is connected with driving cylinder, and then drives the axial movement of sliding block 213, thus clamping or pine
Open sealed relay, sliding clamp 216 and pinboard by screw connection, different model, size sealed relay clamping
Only need to change corresponding sliding clamp 216.
Specifically, the positioning mechanism includes supporting plate 221, positioning plate 222, positioning pressuring plate 223, and the supporting plate 221 is arranged
On the moving direction of sliding block 213, the positioning pressuring plate 223 is removably attached to the top of cardboard by positioning plate 222, and
Positioning pressuring plate 223 and sliding clamp 216 are opposite.
The positioning pressuring plate 223 and positioning plate 222 by screw connection, by supporting plate 221 can be accurately positioned sealing after
Electric appliance meets the sealed relay of different model, size by replacing the positioning pressuring plate 223 on 221 top of supporting plate.
The specifically used method of welding fixture 2 is as follows: need to select matched sliding clamp when welding sealing cover on relay
216 and positioning pressuring plate 223, and they are separately mounted in transfer block 215 and supporting plate 221, then is screwed, start cylinder
It pulls hollow space of the sliding block 213 into support 211 to move, adds the distance between sliding clamp 216 and positioning pressuring plate 223
Greatly, until the distance is braked after being greater than the size for the product that need to be clamped, sealing cover and sealed relay is placed on cushion block 11, adjusted
Screw on the whole tight positioning pressuring plate 223 of good position back spin completes positioning；It is again started up cylinder, pushes sliding block 213 to supporting plate
221 slidings screw sliding clamp 216 until the sliding clamp 216 of 213 end of sliding block closes cylinder after moving to designated position
On screw, that is, complete sealing cover and sealed relay clamping；Welding machine can be started and complete welding.
After the completion of welding, when needing to weld the sealed relay of another model, size, first by sliding clamp 216 and positioning
Screw on pressing plate 223 unloads, and removes sliding clamp 216 and positioning pressuring plate 223, starts cylinder, pulls sliding block 213 to far from branch
The direction of plate 221 is slided, and is unclamped the finished product after the completion of welding, is removed finished product, new sealing cover and sealed relay are placed on pad
On block 11, the sliding clamp 216 and positioning pressuring plate 223 to match with them is selected, and be mounted on transfer block 215 and supporting plate 221
On, start cylinder, sliding block 213 is pushed to slide to supporting plate 221, until the sliding clamp 216 of 213 end of sliding block moves to specific bit
Closing cylinder is postponed, the screw on sliding clamp 216 is screwed, the welding that welding machine carries out new product can be started.
The weldment 3 includes pedestal 31, rotating arm 32, spreading arm 33, laser head 34, and the pedestal 31 connects with board 1
It connects and is rotated along the central axis of pedestal 31, one end of the rotating arm 32 and the side of pedestal 31 are hinged, the spreading arm 33
One end and rotating arm 32 the other end it is hinged, the laser head 34 connect with the other end of spreading arm 33 and turns around tie point
It is dynamic.
Laser head 34 and pedestal 31 are connected by rotating arm 32 and spreading arm 33, it is worked in intelligent super laser cold welding machine
Cheng Zhong, pedestal 31 are able to drive rotating arm 32 and realize 360 degree of rotations, and the hinged cooperation of both rotating arm 32 and spreading arm 33 being capable of band
Dynamic laser head 34 reaches specified altitude assignment and position, and two control arms cooperate to realize no dead angle welding, to expand significantly
The welding range of intelligent super laser cold welding machine.
1 surface of board offers several chip spaces 41 along the periphery of cushion block 11, is equipped with chip removal pipeline 42 in board 1,
One end of chip removal pipeline 42 is connected to chip space 41, the other end of chip removal pipeline 42 extend to board 1 it is outer and with a dust storage chamber 43
Connection, the dust storage chamber 43 is connected with suction ventilator 44, and the joint face of dust storage chamber 43 and suction ventilator 44 is equipped with dustproof filter screen.
The clast generated in welding process can be collected by chip space 41 to dust under the suction of suction ventilator 44
In room 43, debris from fouling equipment and ambient enviroment are avoided.
Specifically, the pedestal 31 includes fixing seat, rotating seat, link block, and the fixing seat is installed on board 1, Gu
The top center of reservation is equipped with vertical shaft, and the rotating seat is socketed in shaft surface, and the link block is installed in rotating seat
Top, the rotating arm 32 connect with link block.
Rotating seat by bearing holder (housing, cover) on shaft surface, rotating seat is connect with the arbor of a motor, motor driven rotating seat around
Shaft rotation, so that rotating arm 32 be driven to realize 360 degree rotation.
Specifically, the rotating arm 32 and spreading arm 33 pass through fine motion motor control.
Rotating arm 32 and spreading arm 33 realize movement of the laser head 34 in spatial position by fine motion motor control.
Specifically, the bottom end that the support 211 is located at sliding block 213 is equipped with support plate 217.
By the way that support plate 217 is arranged in the bottom end of sliding block 213, support plate 217 can limit the vertical direction of sliding block 213
It is mobile, so that sliding block 213 is moved in parallel, the offset of anti-limited slip block 213.
Specifically, the support 211 is whole U-shaped.
The support 211 is whole U-shaped, and internal is hollow design, not only saves material, but also also improve sliding block
213 stroke is able to satisfy the clamping of the sealed relay of different model, size.
Specifically, the microprocessor for being equipped with weld assembly inside the board 1 and being connect with weld assembly, the board 1
Side be additionally provided with control panel, the control panel is equipped with frequency the adjusting component, duty ratio tune connect with microprocessor
Save component, mode selecting key, weld interval adjusting component.
Specifically, it includes liquid crystal frequency display window and two frequency adjusting keys that the frequency, which adjusts component,；The duty ratio
Adjusting component includes liquid crystal duty ratio display window and two duty cycle adjustment keys；It includes liquid crystal weldering that the weld interval, which adjusts component,
Connect time showing window and two weld interval adjusting keys.
The intelligent super laser cold welding machine of this specific embodiment has following several bond patterns: accurate spot welding, and continuous impulse welds,
Argon welding is fully welded, simple to weld.It realizes a tractor serves several purposes, kills two birds with one stone.
This specific embodiment has the advantage that
Weld strength is high: metallurgy welding completely, the post-productions such as mend millable, file.
It is fast to repair precision height, repairing speed: most fast repairing amount is up to 100mm2/min.
Substrate damage is small, voltage adaptation range is big: when voltage change fluctuates in range about 20%, machine is remained to
Guarantee to work normally, and maintains stable output power.
Embodiment of above is only that preferred embodiments of the present invention are described, not to the utility model
Range be defined, under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel to this
The various changes and improvements that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine
It protects in range.
Claims (9)
1. a kind of intelligence super laser cold welding machine, including board, it is characterised in that: the board is equipped with welding fixture, weldment,
The welding fixture includes the positioning mechanism and clamp system of two groups of mutual horizontal verticals, and the board surface is equipped with cushion block, and
Cushion block is between positioning mechanism and clamp system；
The weldment includes pedestal, rotating arm, spreading arm, laser head, and the pedestal connect with board and along the center of pedestal
Axis rotation, one end of the rotating arm and the side of pedestal are hinged, and one end of the spreading arm and the other end of rotating arm are cut with scissors
It connects, the other end connection of the laser head and spreading arm is simultaneously rotated around tie point；
The board surface offers several chip spaces along the periphery of cushion block, is equipped with chip removal pipeline in board, and the one of chip removal pipeline
End is connected to chip space, and the other end of chip removal pipeline is extended to outside board and is connected to a dust storage chamber, and the dust storage chamber is connected with
Suction ventilator, and the joint face of dust storage chamber and suction ventilator is equipped with dustproof filter screen.
2. a kind of intelligent super laser cold welding machine according to claim 1, it is characterised in that: the clamp system includes branch
Seat, guide sleeve, sliding block, the guide sleeve are horizontally set on board by support, and guide sleeve is socketed in shoe surface, and sliding block is along guide sleeve
Extending direction it is mobile, the both ends of sliding block extend to outside guide sleeve, and one end of sliding block is connected with cylinder briquetting, and the other end of sliding block connects
It is connected to transfer block, is removably equipped with sliding clamp in the transfer block.
3. a kind of intelligent super laser cold welding machine according to claim 2, it is characterised in that: the positioning mechanism includes branch
Plate, positioning plate, positioning pressuring plate, the supporting plate are arranged on the moving direction of sliding block, and the positioning pressuring plate is removable by positioning plate
It is fixed on the top of cardboard with unloading, and positioning pressuring plate is opposite with sliding clamp.
4. a kind of intelligent super laser cold welding machine according to claim 1, it is characterised in that: the pedestal include fixing seat,
Rotating seat, link block, the fixing seat are installed on board, and the top center of fixing seat is equipped with vertical shaft, the rotation
Seat is socketed in shaft surface, and the link block is installed in the top of rotating seat, and the rotating arm is connect with link block.
5. a kind of intelligent super laser cold welding machine according to claim 1, it is characterised in that: the rotating arm and spreading arm are logical
Cross fine motion motor control.
6. a kind of intelligent super laser cold welding machine according to claim 2, it is characterised in that: the support is located at the bottom of sliding block
End is equipped with support plate.
7. a kind of intelligent super laser cold welding machine according to claim 2, it is characterised in that: the support is integrally U-shaped.
8. a kind of intelligent super laser cold welding machine according to claim 1, it is characterised in that: be equipped with welding inside the board
Component and the microprocessor connecting with weld assembly, the side of the board are additionally provided with control panel, set on the control panel
There is the frequency connecting with microprocessor to adjust component, duty cycle adjustment component, mode selecting key, weld interval adjusting component.
9. a kind of intelligent super laser cold welding machine according to claim 8, it is characterised in that: the frequency adjusts component and includes
Liquid crystal frequency display window and two frequency adjusting keys；The duty cycle adjustment component includes that liquid crystal duty ratio display window and two account for
Sky compares adjusting key；It includes liquid crystal weld interval display window and two weld interval adjusting keys that the weld interval, which adjusts component,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820855179.2U CN208304148U (en) | 2018-06-04 | 2018-06-04 | A kind of intelligence super laser cold welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820855179.2U CN208304148U (en) | 2018-06-04 | 2018-06-04 | A kind of intelligence super laser cold welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208304148U true CN208304148U (en) | 2019-01-01 |
Family
ID=64709379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820855179.2U Expired - Fee Related CN208304148U (en) | 2018-06-04 | 2018-06-04 | A kind of intelligence super laser cold welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208304148U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118143286A (en) * | 2024-05-10 | 2024-06-07 | 成都航空职业技术学院 | Method for reducing defects of surface layer of SLM formed 18Ni300 steel |
-
2018
- 2018-06-04 CN CN201820855179.2U patent/CN208304148U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118143286A (en) * | 2024-05-10 | 2024-06-07 | 成都航空职业技术学院 | Method for reducing defects of surface layer of SLM formed 18Ni300 steel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211804397U (en) | Multi-station laser welding equipment for automobile parts | |
| CN110695561A (en) | Full-automatic circumferential weld welding and polishing device for gas cylinder | |
| CN204673179U (en) | A kind of auto spiral welder with conveying device | |
| CN205043377U (en) | Spiral welding seam automatic weld equipment | |
| CN208304148U (en) | A kind of intelligence super laser cold welding machine | |
| CN115401375A (en) | Multifunctional automatic welding device | |
| CN202388104U (en) | Automatic welding machine capable of copying | |
| CN206105213U (en) | Electric automatization's round piece welding machine | |
| CN209453054U (en) | Supporter robot automatic rotary welding production line | |
| CN212349318U (en) | Auxiliary device is glued to glass frame | |
| CN111716000A (en) | Laser welding device | |
| CN209578630U (en) | A kind of combustion gas pipe fitting automatic soldering device | |
| CN205032897U (en) | A circular arc and an axle type repairing welding are met sb. at airport | |
| CN214444101U (en) | Fixed welding set of trachea | |
| CN214024281U (en) | Clamping tool for laser welding machine | |
| CN212761770U (en) | Clamp for laser welding of display cabinet bracket | |
| CN218904171U (en) | Intelligent build-up welding device | |
| CN212311245U (en) | A welding machine arm for welding machine | |
| CN214518432U (en) | Metal welding device | |
| CN218311723U (en) | Car welds clamping apparatus with repair welding platform switching function | |
| CN220259963U (en) | Welding fixture for battery frame | |
| CN220330253U (en) | Single-machine type laser welding equipment | |
| CN220971189U (en) | Welding tool fixture with wide applicability | |
| CN217889816U (en) | Oil gas pipeline electric arc welding device based on laser positioning | |
| CN213857582U (en) | Ultrasonic metal welding machine convenient to equipment is maintained |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190101 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |