CN213915913U - Automatic thread rolling machine of material loading - Google Patents
Automatic thread rolling machine of material loading Download PDFInfo
- Publication number
- CN213915913U CN213915913U CN202022719389.9U CN202022719389U CN213915913U CN 213915913 U CN213915913 U CN 213915913U CN 202022719389 U CN202022719389 U CN 202022719389U CN 213915913 U CN213915913 U CN 213915913U
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- steel pipe
- material loading
- rolling machine
- thread rolling
- hollow block
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- 239000000463 material Substances 0.000 title claims abstract description 68
- 238000005096 rolling process Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 101
- 239000010959 steel Substances 0.000 claims abstract description 101
- 230000000670 limiting effect Effects 0.000 claims description 17
- 238000007599 discharging Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 29
- 210000003437 trachea Anatomy 0.000 abstract 2
- 238000003466 welding Methods 0.000 abstract 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003031 feeding effect Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000641 cold extrusion Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses an automatic thread rolling machine of material loading, its technical scheme is: including the material loading platform, the inside steel pipe that is equipped with of material loading platform, material loading platform outer wall right-hand member passes through right angle frame fixed mounting motor, material loading platform outer wall right-hand member passes through right angle frame fixed mounting cylinder, cylinder output welding expansion device, the inside front end of material loading platform is equipped with fixing device, expansion device includes hollow block, rubber block and trachea, the welding of hollow block right-hand member is in the output of cylinder, the inside joint of hollow block the rubber block, peg graft in the inside upper end of hollow block the trachea, fixing device includes U type fixing base and electric telescopic handle, the beneficial effects of the utility model are that: the effect that the steel pipe is taken out of the processing shaft conveniently, the steel pipe is prevented from being stopped between the processing shafts, and the material is prevented from being damaged and the thread rolling machine is prevented from being clamped easily is achieved.
Description
Technical Field
The utility model relates to a thread rolling machine field, concretely relates to automatic material loading's thread rolling machine.
Background
The thread rolling machine is a multifunctional cold extrusion forming machine tool, and can perform thread, straight line, cross grain rolling and other processing on a workpiece in a cold state within the range of rolling force of the thread rolling machine; rolling straight teeth, helical teeth and helical spline gears; straightening, reducing, roll finishing and various forming and rolling; the machine has safe and reliable electric, hydraulic execution and control system, and each working cycle can be selected from manual, semi-automatic and automatic modes.
The cold rolling process is an advanced non-cutting process, can effectively improve the internal and surface quality of the workpiece, and can obviously improve the fatigue strength and the torsional strength of the workpiece due to the radial compressive stress generated during processing, thereby being an ideal process with high efficiency, energy saving and low consumption.
The prior art has the following defects: the existing thread rolling machine needs to push a steel pipe to a processing shaft of the thread rolling machine when the steel pipe is processed, the steel pipe is taken out from the processing shaft after the processing shaft is processed, but the existing pushing device cannot well take the steel pipe out of the processing shaft, so that the pushing device and the steel pipe are separated, the steel pipe is stopped between the processing shafts, the material is damaged, and the thread rolling machine is easy to clamp.
Therefore, the invention is necessary to develop an automatic feeding thread rolling machine.
SUMMERY OF THE UTILITY MODEL
For this, the utility model provides an automatic thread rolling machine of material loading through placing the steel pipe in the inside rear end of material loading platform, drives the biography feed cylinder through the motor and rotates, makes inside the steel pipe conveys fixing device, and rethread cylinder promotes expansion device, makes expansion device peg graft inside the steel pipe, makes the rubber block extrude steel pipe inner wall through the air pump to solve the problem of taking out the steel pipe from the processing axle that current pusher can not be fine.
In order to achieve the above object, the present invention provides the following technical solutions: an automatic feeding thread rolling machine comprises a feeding platform, wherein a steel pipe is arranged in the feeding platform, a motor is fixedly mounted at the right end of the outer wall of the feeding platform through a right-angle frame, an air cylinder is fixedly mounted at the right end of the outer wall of the feeding platform through the right-angle frame, an expansion device is welded at the output end of the air cylinder, and a fixing device is arranged at the front end in the feeding platform;
the expansion device comprises a hollow block, a rubber block and an air pipe, the right end of the hollow block is welded at the output end of the air cylinder, the rubber block is clamped in the hollow block, and the air pipe is inserted at the upper end in the hollow block;
fixing device includes U type fixing base and electric telescopic handle, electric telescopic handle passes through bolt fixed mounting in the inside front end of material loading platform, electric telescopic handle upper end threaded connection the inside bottom of U type fixing base, the inside joint of U type fixing base the steel pipe.
Preferably, the left end of the outer wall of the feeding platform is provided with a limiting pipe, and the front end inside the feeding platform is provided with a discharging hole.
Preferably, the feeding platform inclines towards the front end, and the discharging hole is formed in the front end of the fixing device.
Preferably, the output end of the motor is connected with a material conveying cylinder, the material conveying cylinder is fixedly installed inside the feeding platform through a shaft seat, and the outer wall of the material conveying cylinder is fixedly provided with a material conveying block through a bolt.
Preferably, the rubber block is shaped like a sector, and the other end of the air pipe is connected with an air pump.
Preferably, fixing device still includes the arc fixing base, arc fixing base bottom threaded connection electric telescopic handle, the inside joint of arc fixing base the steel pipe.
Compared with the prior art, the automatic feeding thread rolling machine has the advantages that:
the steel pipe is placed at the rear end inside the feeding platform, and the steel pipe is tightly attached to the material conveying cylinder under the action of the inclination of the feeding platform to the front end;
when the motor is started, the motor drives the material conveying cylinder to rotate, so that the material conveying block is driven to rotate, and the material conveying block is L-shaped, so that the steel pipe is overturned to the front end of the material conveying cylinder through the material conveying block, and falls into the fixing device to play a role in transmission, and the effect of automatic feeding is achieved;
the air cylinder is started to push the hollow block to be inserted into the steel pipe, the other end of the air pipe is connected with the air pump, and when the air cylinder pushes the hollow block to be inserted into the steel pipe;
the air pump is started, so that the air pipe blows air to the inside of the hollow block, the rubber block expands outwards under the action of the wind to extrude the inner wall of the air pipe to play a role in fixing the air pipe and achieve the effects of fixing the air pipe and facilitating grabbing, thereby achieving the effects of facilitating taking out of the steel pipe from the processing shaft and preventing the steel pipe from being stopped between the processing shafts to cause material damage and easily cause the clamping of the thread rolling machine;
the cylinder is started again, so that the steel pipe passes through the limiting pipe and enters the machining shaft for machining, the limiting effect is achieved, and the effect of preventing the steel pipe from moving is achieved;
after the processing of processing axle is accomplished, start the cylinder and contract, when waiting to resume initial position, close the air pump, unload the extrusion force of rubber piece to the steel pipe, rethread fixing device moves down, makes the steel pipe roll and falls unloading hole department, carries out the unloading, plays the effect of automatic unloading of going up, reaches the effect that makes things convenient for the steel pipe to take out from the processing axle.
Drawings
Fig. 1 is a schematic overall top view structure diagram of embodiment 1 provided by the present invention;
fig. 2 is a schematic overall right-view structural diagram of embodiment 1 provided by the present invention;
fig. 3 is a schematic view of an overall front view cross-sectional structure of embodiment 1 provided by the present invention;
fig. 4 is a schematic structural view of a transfer cylinder according to embodiment 1 of the present invention;
fig. 5 is an enlarged view of region a of fig. 1 in accordance with the present invention;
fig. 6 is a schematic sectional view of an expansion device according to example 1 of the present invention;
fig. 7 is a schematic cross-sectional structure view of a transfer cylinder according to embodiment 1 of the present invention;
fig. 8 is an enlarged view of region B of fig. 3 in accordance with the present invention;
fig. 9 is a schematic structural view of a fixing device according to embodiment 1 of the present invention;
fig. 10 is a schematic structural view of a fixing device according to embodiment 2 of the present invention.
In the figure: the feeding device comprises a feeding platform 1, a limiting pipe 11, a discharging hole 12, a steel pipe 2, a motor 3, a material conveying cylinder 31, a material conveying block 32, a cylinder 4, an expansion device 5, a hollow block 51, a rubber block 52, an air pipe 53, a fixing device 6, a U-shaped fixing seat 61, an electric telescopic rod 62 and an arc-shaped fixing seat 63.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Embodiment 1, referring to fig. 1 to 9 of the drawings, the utility model provides an automatic feeding thread rolling machine, which comprises a feeding platform 1, a steel pipe 2, a motor 3, a cylinder 4, an expansion device 5 and a fixing device;
further, the right end of the outer wall of the feeding platform 1 is fixedly provided with a motor 3 through a right-angle bracket, the feeding platform 1 comprises a limiting pipe 11 and a blanking hole 12, concretely, the left end of the outer wall of the feeding platform 1 is provided with the limiting pipe 11, the front end inside the feeding platform 1 is provided with the blanking hole 12, the motor 3 is a three-phase asynchronous motor, the model of an air pump is VAY8828, the air pump is a device for removing air from a closed space or adding air from the closed space, the model of an air cylinder 4 is SU63, the air cylinder 4 is a cylindrical metal part for guiding a piston to perform linear reciprocating motion in the cylinder, the steel pipe 2 is placed at the rear end inside the feeding platform 1, the steel pipe 2 is tightly attached to the material conveying cylinder 31 under the effect that the front end of the feeding platform 1 is inclined, the material conveying cylinder 31 is fixedly arranged inside the feeding platform 1 through an axle seat, the outer wall of the material conveying cylinder 31 is fixedly provided with a material conveying block 32 through bolts, when the motor 3 is started, the motor 3 drives the material conveying cylinder 31 to rotate, so as to drive the material conveying block 32 to rotate, the shape of the material conveying block 32 is set to be L-shaped, the steel pipe 2 is overturned to the front end of the material conveying cylinder 31 through the material conveying block 32, the steel pipe 2 rolls down to the inside of the fixing device 6 to play a role in transmission, the automatic feeding effect is achieved, the air cylinder 4 is fixedly installed at the right end of the outer wall of the feeding platform 1 through a right-angle frame, the hollow block 51 is welded at the output end of the air cylinder 4, the rubber block 52 is clamped in the hollow block 51, the air pipe 53 is inserted at the upper end in the hollow block 51, the air cylinder 4 is started to push the hollow block 51 to be inserted in the steel pipe 2, the air pump is connected at the other end of the air pipe 53, when the air cylinder 4 pushes the hollow block 51 to be inserted in the steel pipe 2, the air pipe 53 blows air to the hollow block 51, at the moment, under the action force of the rubber block 52 in the wind, the steel pipe 2 is expanded outwards to extrude the inner wall of the air pipe 53 to play a role in fixing, the air pipe 53 is fixed, and the effect of facilitating grabbing is achieved, so that the steel pipe 2 can be conveniently taken out of a processing shaft, the effects of preventing the steel pipe from being stopped between the processing shafts and causing material damage and easily causing the clamping of a thread rolling machine are achieved, the air cylinder 4 is started again, the steel pipe 2 enters the processing shaft through the limiting pipe 11 to be processed, the limiting effect is achieved, the effect of preventing the steel pipe 2 from moving is achieved, after the processing of the processing shaft is completed, the air cylinder 4 is started to retract, when the initial position is recovered, the air pump is closed, the extrusion force of the rubber block 52 on the steel pipe 2 is removed, the steel pipe 2 is moved downwards through the fixing device 6, the steel pipe 2 is rolled to the blanking hole 12 to perform blanking, the automatic blanking is achieved, and the effect of facilitating taking out of the steel pipe 2 from the processing shaft is achieved;
further, the fixing device 6 is arranged at the inner front end of the feeding platform 1, the fixing device 6 comprises a U-shaped fixing seat 61 and an electric telescopic rod 62, specifically, the electric telescopic rod 62 is fixedly installed at the inner front end of the feeding platform 1 through a bolt, the upper end of the electric telescopic rod 62 is in threaded connection with the inner bottom end of the U-shaped fixing seat 61, the electric push rod is also called a linear actuator, the model of the motor push rod 62 is YNT-03, the motor push rod 62 is a novel linear actuator composed of a motor push rod 62, a control device and the like, the electric telescopic rod 62 is fixedly installed at the inner front end of the feeding platform 1 through a bolt, the upper end of the electric telescopic rod 62 is in threaded connection with the inner bottom end of the U-shaped fixing seat 61, the electric telescopic rod 62 is lifted up, the steel pipe 2 is clamped inside the U-shaped fixing seat 61, the fixing and limiting effects are achieved, and the steel pipe 2 is limited and fixed, prevent that steel pipe 2 from rolling down to unloading hole 12, and prevent the effect that steel pipe 2 drops when processing, descend through electric telescopic handle 62, make steel pipe 2 roll down to unloading hole 12 play, reach the effect of unloading.
The utility model discloses a use as follows: a person skilled in the art places a steel pipe 2 at the rear end inside a feeding platform 1, under the action of the inclination of the front end of the feeding platform 1, the steel pipe 2 is tightly attached to a material conveying cylinder 31, the output end of a motor 3 is connected with the material conveying cylinder 31, the material conveying cylinder 31 is fixedly installed inside the feeding platform 1 through a shaft seat, the outer wall of the material conveying cylinder 31 is fixedly provided with a material conveying block 32 through a bolt, when the motor 3 is started, the motor 3 drives the material conveying cylinder 31 to rotate so as to drive the material conveying block 32 to rotate, the steel pipe 2 is overturned to the front end of the material conveying cylinder 31 through the material conveying block 32 so that the steel pipe 2 rolls down inside a fixing device 6 to play a transmission role to achieve the effect of automatic feeding, the steel pipe is fixedly installed at the right end of the outer wall of the feeding platform 1 through a cylinder 4 through a rack, the output end of the cylinder 4 is welded with a hollow block 51, and the rubber block 52 is clamped inside the hollow block 51, the air pipe 53 is inserted at the upper end in the hollow block 51, the air cylinder 4 is started to push the hollow block 51 to be inserted in the steel pipe 2, the air pump is connected with the other end of the air pipe 53, when the air cylinder 4 pushes the hollow block 51 to be inserted in the steel pipe 2, the air pump is started to blow air into the hollow block 51 through the air pipe 53, at the moment, the rubber block 52 expands outwards under the action force in the wind to extrude the inner wall of the air pipe 53 to play a fixing role and achieve the effect of fixing the air pipe 53 and facilitating grabbing, so that the steel pipe 2 can be conveniently taken out from the processing shaft, the steel pipe is prevented from being stopped between the processing shafts to cause material damage and the effect of easily blocking a thread rolling machine, the air cylinder 4 is restarted to enable the steel pipe 2 to pass through the limiting pipe 11 to enter the processing shaft for processing, the limiting effect is achieved, the effect of preventing the steel pipe 2 from moving is achieved, after the processing shaft is completed, the cylinder 4 is started to retract, when the initial position is recovered, the air pump is closed, the extrusion force of the rubber block 52 on the steel pipe 2 is removed, the fixing device 6 moves downwards to enable the steel pipe 2 to roll to the blanking hole 12 for blanking, the effect of automatic blanking is achieved, the steel pipe 2 can be conveniently taken out from the processing shaft, is fixedly arranged at the front end inside the feeding platform 1 through an electric telescopic rod 62 by bolts, the upper end of the electric telescopic rod 62 is connected with the bottom end inside the U-shaped fixed seat 61 by screw threads, the electric telescopic rod 62 is lifted to clamp the steel pipe 2 in the U-shaped fixed seat 61 to play roles of fixing and limiting, so that the steel pipe 2 is limited and fixed, the steel pipe 2 is prevented from rolling down to the blanking hole 12, the steel pipe 2 is prevented from falling off during processing, the electric telescopic rod 62 descends to enable the steel pipe 2 to roll down to the discharging hole 12 and then discharge the steel pipe, so that the discharging effect is achieved.
Embodiment 2, referring to fig. 10, the present invention provides an automatic feeding thread rolling machine, including a fixing device 6;
further, the fixing device 6 is arranged at the front end inside the feeding platform 1, the fixing device 6 further comprises an arc-shaped fixing seat 63, specifically, the bottom end of the arc-shaped fixing seat 63 is in threaded connection with an electric telescopic rod 62, the steel pipe 2 is clamped inside the arc-shaped fixing seat 63, the electric telescopic rod 62 is in threaded connection with the bottom end of the arc-shaped fixing seat 63, the steel pipe 2 is clamped inside the arc-shaped fixing seat 63 and is lifted up through the electric telescopic rod 62, the steel pipe 2 is clamped inside the arc-shaped fixing seat 63, fixing and limiting effects are achieved, limiting and fixing of the steel pipe 2 are achieved, the steel pipe 2 is prevented from rolling down to the feeding hole 12, the steel pipe 2 is prevented from falling off during processing, the electric telescopic rod 62 descends, the steel pipe 2 is made to roll down to the feeding hole 12, and the feeding effect is achieved;
the utility model discloses a use as follows: a person skilled in the art places a steel pipe 2 at the rear end inside a feeding platform 1, under the action of the inclination of the front end of the feeding platform 1, the steel pipe 2 is tightly attached to a material conveying cylinder 31, the output end of a motor 3 is connected with the material conveying cylinder 31, the material conveying cylinder 31 is fixedly installed inside the feeding platform 1 through a shaft seat, the outer wall of the material conveying cylinder 31 is fixedly provided with a material conveying block 32 through a bolt, when the motor 3 is started, the motor 3 drives the material conveying cylinder 31 to rotate so as to drive the material conveying block 32 to rotate, the steel pipe 2 is overturned to the front end of the material conveying cylinder 31 through the material conveying block 32 so that the steel pipe 2 rolls down inside a fixing device 6 to play a transmission role to achieve the effect of automatic feeding, the steel pipe is fixedly installed at the right end of the outer wall of the feeding platform 1 through a cylinder 4 through a rack, the output end of the cylinder 4 is welded with a hollow block 51, and the rubber block 52 is clamped inside the hollow block 51, the air pipe 53 is inserted at the upper end in the hollow block 51, the air cylinder 4 is started to push the hollow block 51 to be inserted in the steel pipe 2, the air pump is connected with the other end of the air pipe 53, when the air cylinder 4 pushes the hollow block 51 to be inserted in the steel pipe 2, the air pump is started to blow air into the hollow block 51 through the air pipe 53, at the moment, the rubber block 52 expands outwards under the action force in the wind to extrude the inner wall of the air pipe 53 to play a fixing role and achieve the effect of fixing the air pipe 53 and facilitating grabbing, so that the steel pipe 2 can be conveniently taken out from the processing shaft, the steel pipe is prevented from being stopped between the processing shafts to cause material damage and the effect of easily blocking a thread rolling machine, the air cylinder 4 is restarted to enable the steel pipe 2 to pass through the limiting pipe 11 to enter the processing shaft for processing, the limiting effect is achieved, the effect of preventing the steel pipe 2 from moving is achieved, after the processing shaft is completed, starting cylinder 4 and retracting, when waiting to resume initial position, close the air pump, unload the extrusion force of rubber block 52 to steel pipe 2, rethread fixing device 6 moves down, make steel pipe 2 roll and fall unloading hole 12 department, carry out the unloading, play the effect of automatic unloading of going up, reach the effect that makes things convenient for steel pipe 2 to take out from the processing axle, through arc fixing base 63 bottom threaded connection electric telescopic handle 62, the inside joint steel pipe 2 of arc fixing base 63, rise through electric telescopic handle 62, make the inside joint steel pipe 2 of arc fixing base 63, play fixed and spacing effect, reach and carry out spacingly and fixed to steel pipe 2, prevent that steel pipe 2 from rolling and falling unloading hole 12, and prevent that steel pipe 2 from working the effect that drops in man-hour, descend through electric telescopic handle 62, make steel pipe 2 roll and fall to unloading hole 12 play, reach the effect of unloading.
The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.
Claims (6)
1. The utility model provides an automatic thread rolling machine of material loading, includes material loading platform (1), its characterized in that: a steel pipe (2) is arranged inside the feeding platform (1), a motor (3) is fixedly mounted at the right end of the outer wall of the feeding platform (1) through a right-angle stand, an air cylinder (4) is fixedly mounted at the right end of the outer wall of the feeding platform (1) through the right-angle stand, an expansion device (5) is welded at the output end of the air cylinder (4), and a fixing device (6) is arranged at the front end inside the feeding platform (1);
the expansion device (5) comprises a hollow block (51), a rubber block (52) and an air pipe (53), the right end of the hollow block (51) is welded at the output end of the air cylinder (4), the rubber block (52) is clamped in the hollow block (51), and the air pipe (53) is inserted in the upper end in the hollow block (51);
fixing device (6) include U type fixing base (61) and electric telescopic handle (62), electric telescopic handle (62) are in through bolt fixed mounting the inside front end of material loading platform (1), electric telescopic handle (62) upper end threaded connection the inside bottom of U type fixing base (61), the inside joint of U type fixing base (61) steel pipe (2).
2. An automatic loading thread rolling machine according to claim 1, characterized in that: the material loading platform is characterized in that a limiting pipe (11) is arranged at the left end of the outer wall of the material loading platform (1), and a material unloading hole (12) is formed in the front end inside the material loading platform (1).
3. An automatic loading thread rolling machine according to claim 2, characterized in that: the feeding platform (1) inclines towards the front end, and the discharging hole (12) is formed in the front end of the fixing device (6).
4. An automatic loading thread rolling machine according to claim 1, characterized in that: the output end of the motor (3) is connected with the material conveying barrel (31), the material conveying barrel (31) is fixedly installed inside the feeding platform (1) through a shaft seat, and the outer wall of the material conveying barrel (31) is fixedly provided with the material conveying block (32) through a bolt.
5. An automatic loading thread rolling machine according to claim 1, characterized in that: the rubber block (52) is fan-shaped, and the other end of the air pipe (53) is connected with an air pump.
6. An automatic loading thread rolling machine according to claim 1, characterized in that: fixing device (6) still include arc fixing base (63), arc fixing base (63) bottom threaded connection electric telescopic handle (62), the inside joint of arc fixing base (63) steel pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022719389.9U CN213915913U (en) | 2020-11-23 | 2020-11-23 | Automatic thread rolling machine of material loading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022719389.9U CN213915913U (en) | 2020-11-23 | 2020-11-23 | Automatic thread rolling machine of material loading |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213915913U true CN213915913U (en) | 2021-08-10 |
Family
ID=77171538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022719389.9U Expired - Fee Related CN213915913U (en) | 2020-11-23 | 2020-11-23 | Automatic thread rolling machine of material loading |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213915913U (en) |
-
2020
- 2020-11-23 CN CN202022719389.9U patent/CN213915913U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210810 |