CN202824872U - Multistage bar cutting machine - Google Patents
Multistage bar cutting machine Download PDFInfo
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- CN202824872U CN202824872U CN 201220488134 CN201220488134U CN202824872U CN 202824872 U CN202824872 U CN 202824872U CN 201220488134 CN201220488134 CN 201220488134 CN 201220488134 U CN201220488134 U CN 201220488134U CN 202824872 U CN202824872 U CN 202824872U
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Abstract
The utility model discloses a multistage bar cutting machine. The multistage bar cutting machine comprises a substantially horizontal mounting seat plate. The mounting seat plate is provided with a live spindle vertical to the horizontal plane. The live spindle passes through the mounting seat plate. The upper portion of the live spindle is fixed with a plurality of circular chucks. The lower portion of the mounting seat is connected with a first motor through a worm gear transmission mechanism.The periphery of each circular chuck is continuously provided with a plurality of clamping grooves vertical to the end face of the chuck and a belt pulley groove arranged along the center of the outer periphery. The plurality of clamping grooves of the plurality of the chucks correspond to one another in the position. Both sides of the live spindle are provided with a cutter shaft which is parallel to the live spindle and the belt wheel shaft. The lower portion of the belt wheel shaft is arranged on a first sliding seat. The upper portion of the belt wheel shaft is fixedly provided with a plurality of belt pulleys. Each belt pulley is connected with one chuck through a belt. The middle part of the cutter shaft is arranged on a second sliding seat. The upper portion of the cutter shaft is fixedly provided with a plurality of circular cutting blades. The lower portion of the cutting shaft is connected with a second motor through a transmission mechanism. The multistage bar cutting machine has the advantages that the production efficiency is high and the working accuracy is high.
Description
Technical field
The utility model relates to machining apparatus, especially a kind of equipment that can carry out simultaneously to bar the multistage cutting.
Background technology
In the machining technique field, often need to be broken into the bar of segment to long Bar Splitting System Based and then carry out the processing of rear road, the existing processing mode that Bar Splitting System Based is broken into the bar of segment has following several processing mode usually: 1, adopt abrasive wheel cutting machine with emery wheel one section one section cut-out of long bar; 2, adopt sawing machine sawed-off one section one section of long bar with saw blade; 3, adopt punch press to utilize mould that one section one section of long bar is cut off.
Adopting the problem of the processing mode existence of abrasive wheel cutting machine and sawing machine mainly is that working (machining) efficiency is lower, can not better adapt to production in enormous quantities; The problem that the processing mode of employing punch press mainly exists is that the machining accuracy error in length low, bar of bar section is larger, easily makes the bar Leading Edge Deformation, affects the processing of later process.
The utility model content
The technical problems to be solved in the utility model provides a kind of bar multistage cutting machine, and production efficiency is high, and machining accuracy is high.
For achieving the above object, the technical solution of the utility model is: a kind of bar multistage cutting machine, comprise frame, the middle part of frame arranges an installation seat plate that is roughly level, install on the installation seat plate one with the perpendicular rotary main shaft of horizontal plane, rotary main shaft passes installation seat plate and is connected with installation seat plate in the circumferential rotating mode of axial restraint;
Be in a plurality of circular chucks of rotary main shaft partial fixing above the installation seat plate, the pulley groove that the outer peripheral face of each circular chuck is provided with continuously a plurality of clip slots perpendicular to the chuck end face and arranges along outer peripheral face middle part, corresponding, the corresponding clip slot size shape in a plurality of clip slots position of each chuck is identical;
The rotary main shaft part that is in below the installation seat plate partly is connected with the worm gear of a Worm and worm-wheel gearing, and the worm screw of Worm and worm-wheel gearing partly connects the first motor;
The both sides of rotary main shaft are provided with cutter shaft and the Pulley shaft that is parallel to rotary main shaft, the bottom of Pulley shaft is contained on the first sliding seat that an energy moves radially with respect to rotary main shaft, Pulley shaft is connected with the first sliding seat in the circumferential rotating mode of axial restraint, described the first sliding seat is driven by the first cylinder, the first cylinder is fixed on the installation seat plate, the top of Pulley shaft is fixed with a plurality of belt pulleys, and each belt pulley is connected with a chuck by a belt;
The middle part of cutter shaft is contained on another second sliding seat that can move radially with respect to rotary main shaft, cutter shaft is connected with the second sliding seat in the circumferential rotating mode of axial restraint, described the second sliding seat is driven by the second cylinder, the second cylinder is fixed on the installation seat plate, the top of cutter shaft is fixed with a plurality of round cutter sheets, and the bottom of cutter shaft is connected with the second motor on being fixed on frame by transmission mechanism;
Be fixed between the end face of a plurality of chucks on the rotary main shaft and leave the space that allows cutting blade stretch into, described cutting blade is in the space between the end face that can stretch into a plurality of chucks under the drive of the second sliding seat or withdraw from space between the end face of a plurality of chucks.
Further improve, one side of described rotary main shaft also is provided with the automatic feed mechanism that makes bar fall into the corresponding clip slot of each chuck above chuck, described feed mechanism comprises and is arranged on the swash plate of depositing bar above the installation seat plate, is arranged on the 3rd cylinder that chuck next door and rotary main shaft be arranged in parallel, fix a Connection Block on the 3rd cylinder piston rod, a rotary cylinder is fixed on the top of Connection Block, the side of rotary cylinder is fixed one and is roughly L bracket, and the free end of L bracket is near below the lower end of swash plate; The lower end of swash plate is provided with a plurality of spacing preiections, swash plate between a plurality of spacing preiections is provided with recess, be provided with the ejection block that is moved up and down by the four-cylinder kinetic energy below the swash plate lower end, ejection block matches with described recess, next door, swash plate lower end is provided with carrier tube, the top of carrier tube is processed with breach, can push up in the carrier tube being in inclined-plane bar bottom when ejection block moves up, and carrier tube is provided with the cover plate that can rotate near rotary main shaft one end; Carrier tube is articulated on the free end of L bracket near the bottom of rotary main shaft one end by a connecting rod, also be provided with the 5th cylinder on the free end of L bracket, an end of the piston rod of the 5th cylinder and connecting rod is articulated so that the piston rod of the 5th cylinder can drive carrier tube by connecting rod rotates in the horizontal direction and between the vertical direction; A divider is also fixed at the middle part of described Connection Block, drives the L bracket back partition frame that rotate in place and can touch the cover plate that is in the carrier tube end cover plate is removed from the carrier tube end when carrier tube is in vertical direction and rotary cylinder.Can deliver to bar one by one in the corresponding clip slot of a plurality of chucks by automatic feed mechanism, further improve working (machining) efficiency.
Further improve, the bottom of described swash plate lower end is articulated on the carriage that fixes with installation seat plate again, and both sides, swash plate upper end are supported on the carriage by two adjustment screw rods.The convenient gradient of adjusting swash plate better adapts to depositing of bar.
Further improve, also be provided with discharging mechanism on the installation seat plate below the described chuck, described discharging mechanism comprises the conveyer belt that is arranged on the deflector chute below the chuck and is connected deflector chute.Further improve the automatization level of machine, improve the security of operating personnel's operation.
Further improve, described the first motor also partly is connected with the worm screw of Worm and worm-wheel gearing by one speed reducer.Can better regulate the rotating speed of chuck.
Further improve, be provided with corresponding a plurality of through holes between the end face of described a plurality of chucks.Both conveniently move chuck, made things convenient for again mutually contraposition between each chuck.
Further improve, also be provided with an arc-shaped limit plate that supports bar on the installation seat plate below a plurality of chucks.Guarantee that the position that bar falls in the chuck clip slot is more accurate.
Further improve, also be provided with the PLC electric-control system of coordinating each mechanism action on the described frame.Improve the flexibility of operation and the automatization level of machine.
The utility model cuts a bar simultaneously owing to utilizing a cutter shaft that a plurality of cutting blades are installed, once just can cut into multistage to a bar, each cutting blade can also cut the bar of adjacent back when the bar of cutting front simultaneously, shorten the break time of back bar, the utility model is able to continuously in the chuck transmission process and transfers out the bar that cuts into segment, its production efficiency is high, is specially adapted to produce in enormous quantities.
On the other hand, the utility model adopts the mode of rotating blade cutting to cut off bar, because of cutter shaft and main shaft for be arrangeding in parallel, the cutting accuracy of bar section is higher, the error in length of bar can be controlled in the less scope simultaneously, so overall machining accuracy is higher.
Description of drawings
Fig. 1 is the utility model front view.
Fig. 2 is the top view of Fig. 1.
Fig. 3 is that the utility model feed mechanism master looks enlarged drawing.
Fig. 4 is the top view of Fig. 3.
Fig. 5 is that the A of Fig. 3 is to view.
Fig. 6 is that the master of the utility model chuck looks enlarged drawing.
Fig. 7 is the left view of Fig. 6.
The specific embodiment
Below in conjunction with accompanying drawing and concrete embodiment the utility model is described in further detail.
Fig. 1 is to shown in Figure 7, a kind of bar multistage cutting machine, comprise frame 100, the middle part of frame 100 arranges an installation seat plate 1 that is roughly level, install on the installation seat plate 1 one with the perpendicular rotary main shaft 2 of horizontal plane, rotary main shaft 2 passes installation seat plate 1 and is connected with installation seat plate 1 in the circumferential rotating mode of axial restraint, also can fix first an axle bed 21 on installation seat plate 1, and then rotary main shaft 2 is connected with axle bed 21 by bearing again;
Be in a plurality of circular chucks 3 of rotary main shaft 2 partial fixings above the installation seat plate 1, the pulley groove 32 that the outer peripheral face of each circular chuck 3 is provided with continuously a plurality of clip slots 31 perpendicular to chuck 3 end faces and arranges along outer peripheral face middle part, corresponding, corresponding clip slot 31 size shapes in a plurality of clip slots 31 positions of each chuck 3 are identical;
Being in installation seat plate 1 following rotary main shaft 2 parts partly is connected with the worm gear of a Worm and worm-wheel gearing 4, the worm screw of Worm and worm-wheel gearing 4 partly connects the first motor 5, the first motors 5 and also can partly be connected by the worm screw of one speed reducer 6 with Worm and worm-wheel gearing 4;
The both sides of rotary main shaft 2 are provided with cutter shaft 7 and the Pulley shaft 8 that is parallel to rotary main shaft 2, the bottom of Pulley shaft 8 is contained on first sliding seat 81 that can move radially with respect to rotary main shaft 2, Pulley shaft 8 is connected with the first sliding seat 81 in the circumferential rotating mode of axial restraint, described the first sliding seat 81 is driven by the first cylinder 9, the first cylinder 9 is fixed on the installation seat plate 1, the top of Pulley shaft 8 is fixed with a plurality of belt pulleys 10, and each belt pulley 10 is connected with a chuck 3 by a belt 11;
The middle part of cutter shaft 7 is contained on another second sliding seat 71 that can move radially with respect to rotary main shaft 2, cutter shaft 7 is connected with the second sliding seat 71 in the circumferential rotating mode of axial restraint, described the second sliding seat 71 is driven by the second cylinder 12, the second cylinder 12 is fixed on the installation seat plate 1, the top of cutter shaft 7 is fixed with a plurality of round cutter sheets 13, and the bottom of cutter shaft 7 is connected with the second motor 15 on being fixed on frame 100 by belt pulley transmission mechanism 14;
Be fixed between the end face of a plurality of chucks 3 on the rotary main shaft 2 by pad 16 separately so that leave the space that allows cutting blade 13 stretch between each chuck 3 end face, described cutting blade 13 is in the space between the end face that can stretch into a plurality of chucks 3 under the drive of the second sliding seat 71 or withdraw from space between the end face of a plurality of chucks 3.
Be provided with corresponding a plurality of through holes 33 between the end face of described a plurality of chuck 3, bar 200 fall to putting in place the arc-shaped limit plate of rear support bar 200 also can be set on the installation seat plate 1 below a plurality of chucks 3.
Side at rotary main shaft 2 also is provided with the automatic feed mechanism 17 that makes bar 200 fall into each chuck 3 corresponding clip slots 31 above chuck 3, described feed mechanism 17 comprises and is arranged on the swash plate 171 of depositing bar 200 above the installation seat plate 1, be arranged on the 3rd cylinder 172 that chuck 3 next doors and rotary main shaft 2 be arranged in parallel, fix a Connection Block 173 on the 3rd cylinder 172 piston rods, a rotary cylinder 174 is fixed on the top of Connection Block 173, the side of rotary cylinder 174 is fixed one and is roughly L bracket 175, and the free end of L bracket 175 is near below the lower end of swash plate 171;
The lower end of swash plate 171 is provided with a plurality of spacing preiections 1711, swash plate 171 between a plurality of spacing preiections 1711 is provided with recess 1712, be provided with the ejection block 177 that is moved up and down by four-cylinder 176 kinetic energies below swash plate 171 lower ends, ejection block 177 matches with described recess 1712, next door, swash plate 171 lower ends is provided with carrier tube 178, the top of carrier tube 178 is processed with the breach 1781 that allows bar 200 enter, can be being in bar 200 tops bottom, inclined-plane 171 in carrier tube 178 when ejection block 177 moves up, carrier tube 178 is provided with the cover plate 179 that can rotate near rotary main shaft 2 one ends, the lower end of cover plate 179 is articulated in the bottom of carrier tube 178, and the middle part of cover plate 179 is connected by the side of spring 1791 with carrier tube 178;
A divider 1731 is also fixed at the middle part of described Connection Block 173, drives L brackets 175 back partition frame 1731 that rotate in place and can touch the cover plate 179 that is in carrier tube 178 ends cover plate 179 is removed from carrier tube 178 ends when carrier tube 178 is in vertical direction and rotary cylinder 174.
The bottom of described swash plate 171 lower ends is articulated on the carriage 1713 that fixes with installation seat plate 1, and both sides, swash plate 171 upper end are adjusted screw rods 1714 by two and are supported on the carriage 1713.
Also be provided with discharging mechanism 18 on the installation seat plate 1 below the described chuck 3, described discharging mechanism 18 comprises the conveyer belt 182 that is arranged on the deflector chute 181 below the chuck 3 and is connected deflector chute 181.
Also be provided with the PLC electric-control system 19 of coordinating each mechanism action on the described frame 100.
Workflow of the present utility model is as follows:
Start the first motor 5, the first motors 5 and rotate counterclockwise by decelerator 6, Worm and worm-wheel gearing 4 slow driven rotary main shafts 2, rotary main shaft 2 drives a plurality of chucks 3 and slowly rotates counterclockwise;
Then 12 actions of the second cylinder drive the second sliding seat 71 again, cutter shaft 7 moves toward the direction of rotary main shaft 2, the a plurality of round cutter sheets 13 that are fixed on cutter shaft 7 tops stretch into the space between the end face of a plurality of chucks 3 simultaneously, then start the second motor 15, the second motor 15 rotates with movable arbor 7 and a plurality of round cutter sheets 13 of being fixed on cutter shaft 7 tops simultaneously by belt pulley transmission mechanism 14, when the bar 200 of a plurality of chuck 3 clampings turns to when contacting with a plurality of round cutter sheets 13 that rotate, a plurality of round cutter sheets 13 just can carry out the multistage cutting at a bar 200 simultaneously, once just can cut into multistage to bar, the bar that is divided into multistage after being cut off continues to be clamped on the clip slot 31 of chuck 3 by belt 11, when clip slot 31 forwards to when breaking away from belt 11, the bar that is divided into multistage after being cut off will be fallen on the deflector chute 181 and then transfer out frame 100 by conveyer belt 182.
The utility model can not only cut bar, can also incising pipes and the material suitable with the bar profile.
Below only be preferred embodiment of the utility model, the change that those skilled in the art does to be equal to by claim all falls into the protection domain of this case.
Claims (8)
1. a bar multistage cutting machine comprises frame, and the middle part of frame arranges an installation seat plate that is roughly level, it is characterized in that:
Install on the installation seat plate one with the perpendicular rotary main shaft of horizontal plane, rotary main shaft passes installation seat plate and is connected with installation seat plate in the circumferential rotating mode of axial restraint;
Be in a plurality of circular chucks of rotary main shaft partial fixing above the installation seat plate, the pulley groove that the outer peripheral face of each circular chuck is provided with continuously a plurality of clip slots perpendicular to the chuck end face and arranges along outer peripheral face middle part, corresponding, the corresponding clip slot size shape in a plurality of clip slots position of each chuck is identical;
The rotary main shaft part that is in below the installation seat plate partly is connected with the worm gear of a Worm and worm-wheel gearing, and the worm screw of Worm and worm-wheel gearing partly connects the first motor;
The both sides of rotary main shaft are provided with cutter shaft and the Pulley shaft that is parallel to rotary main shaft, the bottom of Pulley shaft is contained on the first sliding seat that an energy moves radially with respect to rotary main shaft, Pulley shaft is connected with the first sliding seat in the circumferential rotating mode of axial restraint, described the first sliding seat is driven by the first cylinder, the first cylinder is fixed on the installation seat plate, the top of Pulley shaft is fixed with a plurality of belt pulleys, and each belt pulley is connected with a chuck by a belt;
The middle part of cutter shaft is contained on another second sliding seat that can move radially with respect to rotary main shaft, cutter shaft is connected with the second sliding seat in the circumferential rotating mode of axial restraint, described the second sliding seat is driven by the second cylinder, the second cylinder is fixed on the installation seat plate, the top of cutter shaft is fixed with a plurality of round cutter sheets, and the bottom of cutter shaft is connected with the second motor on being fixed on frame by transmission mechanism;
Be fixed between the end face of a plurality of chucks on the rotary main shaft and leave the space that allows cutting blade stretch into, described cutting blade is in the space between the end face that can stretch into a plurality of chucks under the drive of the second sliding seat or withdraw from space between the end face of a plurality of chucks.
2. a kind of bar multistage cutting machine according to claim 1, it is characterized in that: a side of described rotary main shaft also is provided with the automatic feed mechanism that makes bar fall into the corresponding clip slot of each chuck above chuck, described feed mechanism comprises and is arranged on the swash plate of depositing bar above the installation seat plate, be arranged on the 3rd cylinder that chuck next door and rotary main shaft be arranged in parallel, fix a Connection Block on the 3rd cylinder piston rod, a rotary cylinder is fixed on the top of Connection Block, the side of rotary cylinder is fixed one and is roughly L bracket, and the free end of L bracket is near below the lower end of swash plate;
The lower end of swash plate is provided with a plurality of spacing preiections, swash plate between a plurality of spacing preiections is provided with recess, be provided with the ejection block that is moved up and down by the four-cylinder kinetic energy below the swash plate lower end, ejection block matches with described recess, next door, swash plate lower end is provided with carrier tube, the top of carrier tube is processed with breach, can push up in the carrier tube being in inclined-plane bar bottom when ejection block moves up, and carrier tube is provided with the cover plate that can rotate near rotary main shaft one end;
Carrier tube is articulated on the free end of L bracket near the bottom of rotary main shaft one end by a connecting rod, also be provided with the 5th cylinder on the free end of L bracket, an end of the piston rod of the 5th cylinder and connecting rod is articulated so that the piston rod of the 5th cylinder can drive carrier tube by connecting rod rotates in the horizontal direction and between the vertical direction;
A divider is also fixed at the middle part of described Connection Block, drives the L bracket back partition frame that rotate in place and can touch the cover plate that is in the carrier tube end cover plate is removed from the carrier tube end when carrier tube is in vertical direction and rotary cylinder.
3. a kind of bar multistage cutting machine according to claim 2 is characterized in that: the bottom of described swash plate lower end is articulated on the carriage that fixes with installation seat plate, and both sides, swash plate upper end are adjusted screw rods by two and are supported on the carriage.
4. a kind of bar multistage cutting machine according to claim 1 is characterized in that: also be provided with discharging mechanism on the installation seat plate below the described chuck, described discharging mechanism comprises the conveyer belt that is arranged on the deflector chute below the chuck and is connected deflector chute.
5. a kind of bar multistage cutting machine according to claim 1, it is characterized in that: described the first motor also partly is connected with the worm screw of Worm and worm-wheel gearing by one speed reducer.
6. a kind of bar multistage cutting machine according to claim 1 is characterized in that: be provided with corresponding a plurality of through holes between the end face of described a plurality of chucks.
7. a kind of bar multistage cutting machine according to claim 1 is characterized in that: also be provided with an arc-shaped limit plate that supports bar on the installation seat plate below a plurality of chucks.
8. according to claim 1 to 7 each described a kind of bar multistage cutting machines, it is characterized in that: also be provided with the PLC electric-control system of coordinating each mechanism action on the described frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220488134 CN202824872U (en) | 2012-09-24 | 2012-09-24 | Multistage bar cutting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220488134 CN202824872U (en) | 2012-09-24 | 2012-09-24 | Multistage bar cutting machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202824872U true CN202824872U (en) | 2013-03-27 |
Family
ID=47936664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220488134 Expired - Fee Related CN202824872U (en) | 2012-09-24 | 2012-09-24 | Multistage bar cutting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202824872U (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104229454A (en) * | 2014-09-15 | 2014-12-24 | 苏州市汇峰机械设备有限公司 | Guide device for cutting machine |
| CN104647117A (en) * | 2015-02-03 | 2015-05-27 | 湖州美通铝业有限公司 | Aluminum bar cutting and conveying device |
| CN106425626A (en) * | 2016-07-29 | 2017-02-22 | 太仓市璜泾新海农机专业合作社 | Automatic cutting device and tool magazine adjusting method thereof |
| CN107570639A (en) * | 2017-10-26 | 2018-01-12 | 德清鼎兴电子有限公司 | A kind of copper cash multistage cutting machine |
| CN107756655A (en) * | 2017-09-28 | 2018-03-06 | 倪雨阳 | A kind of Graphite pad surface trimming, machine-shaping pipelining equipment |
| CN108098040A (en) * | 2017-12-28 | 2018-06-01 | 宁波高新区神台德机械设备有限公司 | A kind of cutter device for metal tube |
| CN112475906A (en) * | 2020-11-30 | 2021-03-12 | 湖南昊普光电科技有限公司 | Tin bar processing professional equipment |
-
2012
- 2012-09-24 CN CN 201220488134 patent/CN202824872U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104229454A (en) * | 2014-09-15 | 2014-12-24 | 苏州市汇峰机械设备有限公司 | Guide device for cutting machine |
| CN104647117A (en) * | 2015-02-03 | 2015-05-27 | 湖州美通铝业有限公司 | Aluminum bar cutting and conveying device |
| CN106425626A (en) * | 2016-07-29 | 2017-02-22 | 太仓市璜泾新海农机专业合作社 | Automatic cutting device and tool magazine adjusting method thereof |
| CN107756655A (en) * | 2017-09-28 | 2018-03-06 | 倪雨阳 | A kind of Graphite pad surface trimming, machine-shaping pipelining equipment |
| CN107756655B (en) * | 2017-09-28 | 2021-01-29 | 河南科特尔机械制造有限公司 | Graphite gasket automatic cutout, machine-shaping assembly line equipment |
| CN107570639A (en) * | 2017-10-26 | 2018-01-12 | 德清鼎兴电子有限公司 | A kind of copper cash multistage cutting machine |
| CN107570639B (en) * | 2017-10-26 | 2019-06-25 | 德清鼎兴电子有限公司 | A kind of copper wire multistage cutting machine |
| CN108098040A (en) * | 2017-12-28 | 2018-06-01 | 宁波高新区神台德机械设备有限公司 | A kind of cutter device for metal tube |
| CN112475906A (en) * | 2020-11-30 | 2021-03-12 | 湖南昊普光电科技有限公司 | Tin bar processing professional equipment |
| CN112475906B (en) * | 2020-11-30 | 2023-07-04 | 湖南昊普光电科技有限公司 | Special equipment for processing tin stop strip |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20150924 |
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| EXPY | Termination of patent right or utility model |