CN216066745U - Steel pipe terminal surface polisher - Google Patents

Steel pipe terminal surface polisher Download PDF

Info

Publication number
CN216066745U
CN216066745U CN202121979189.5U CN202121979189U CN216066745U CN 216066745 U CN216066745 U CN 216066745U CN 202121979189 U CN202121979189 U CN 202121979189U CN 216066745 U CN216066745 U CN 216066745U
Authority
CN
China
Prior art keywords
filter screen
grinding
polishing
steel pipe
wall
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
Application number
CN202121979189.5U
Other languages
Chinese (zh)
Inventor
王曦
杨虎
赵春琳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pengzhou Taimeng New Material Co ltd
Original Assignee
Pengzhou Taimeng New Material Co ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pengzhou Taimeng New Material Co ltd filed Critical Pengzhou Taimeng New Material Co ltd
Priority to CN202121979189.5U priority Critical patent/CN216066745U/en
Application granted granted Critical
Publication of CN216066745U publication Critical patent/CN216066745U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

The utility model discloses a steel pipe end face grinding machine which comprises a grinding shell and a filter screen, wherein the grinding shell is arranged in the middle of the interior of the grinding shell, the filter screen is obliquely arranged in the grinding shell, the filter screen divides the grinding shell into a grinding area and a liquid collecting area which are distributed up and down, a grinding wheel is rotationally arranged in the grinding area, a plurality of grinding through holes located on one side of a grinding face of the grinding wheel are formed in the side wall of the grinding area, and a plurality of cooling liquid spray heads arranged towards the grinding face of the grinding wheel are arranged on the inner wall of the grinding area; the side wall of the liquid collection area is provided with a slag discharge hole positioned at the lower end of the filter screen, the lower end of the filter screen is rotatably connected with the side wall of the liquid collection area, the higher end of the filter screen is connected with the inner wall of the liquid collection area in a sliding manner along the rotating path of the filter screen, a reciprocating transmission part is arranged between the polishing wheel and the higher end of the filter screen, and the reciprocating transmission part enables the higher end of the filter screen to slide in a reciprocating manner by the rotating power of the polishing wheel; compared with the prior art, the utility model avoids the splashing of the scraps and the cooling liquid and easily cleans the scraps and the cooling liquid.

Description

Steel pipe terminal surface polisher
Technical Field
The utility model relates to the technical field of steel processing equipment, in particular to a steel pipe end face grinding machine.
Background
Steel pipes are steel with a hollow cross section whose length is much greater than the diameter or circumference. The steel pipe is divided into round, square, rectangular and special-shaped steel pipes according to the shape of the cross section; the steel pipe is divided into a carbon structural steel pipe, a low-alloy structural steel pipe, an alloy steel pipe and a composite steel pipe according to the material quality; the steel pipes are divided into steel pipes for conveying pipelines, engineering structures, thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, high-pressure equipment and the like according to the application; the method is divided into seamless steel pipes and welded steel pipes according to the production process.
The steel pipe need polish to the burr of its terminal surface after processing is accomplished, and the terminal surface of steel pipe is polished to present generally going on through the polisher, is that the terminal surface of steel pipe compresses tightly on the terminal surface of polishing of the wheel of polisher, is setting a coolant pipe simultaneously, and the wheel of polishing of polisher is at the during operation, and coolant liquid and the sweeps that polish and produce splash everywhere, and the ground in processing district all is coolant liquid and sweeps everywhere, and the clearance is troublesome.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects in the prior art, the utility model aims to provide a steel pipe end face grinding machine to solve the problems that in the prior art, scraps and cooling liquid splash around and are troublesome to clean in the grinding process of the steel pipe end face.
In order to achieve the purpose, the utility model adopts the following technical scheme: a steel pipe end face grinding machine comprises a grinding shell in the middle of the interior of the grinding shell and a filter screen obliquely arranged in the grinding shell, wherein the filter screen divides the grinding shell into a grinding area and a liquid collecting area which are distributed up and down, a grinding wheel is rotatably arranged in the grinding area, a plurality of grinding through holes located on one side of a grinding face of the grinding wheel are formed in the side wall of the grinding area, and a plurality of cooling liquid spray heads arranged towards the grinding face of the grinding wheel are arranged on the inner wall of the grinding area;
the liquid collecting area is characterized in that a slag discharging hole at the low end of the filter screen is formed in the side wall of the liquid collecting area, the low end of the filter screen is rotationally connected with the side wall of the liquid collecting area, the high end of the filter screen is connected with the inner wall of the liquid collecting area in a sliding mode along a rotating path of the inner wall of the liquid collecting area, a reciprocating transmission part is arranged between the polishing wheel and the high end of the filter screen, and the reciprocating transmission part enables the high end of the filter screen to slide in a reciprocating mode through the rotating power of the polishing wheel.
The working principle is as follows: the staff all inserts a steel pipe from each through-hole department of polishing, the terminal surface that makes every steel pipe all offsets with the face of polishing of the wheel of polishing, the wheel of polishing rotates, a plurality of coolant liquid shower nozzles spray the coolant liquid to the face of polishing of wheel of polishing, come to cool down the steel pipe of the in-process of polishing, the sweeps that will produce simultaneously takes away, the coolant liquid is mingled with the sweeps and gets into the collecting space from the district of polishing, separate coolant liquid and sweeps through the filter screen, the coolant liquid passes the filter screen and collects in the collecting space, the sweeps wheel of polishing is at the operation in-process, make the reciprocal slip of filter screen high end through reciprocating drive spare, thereby make the sweeps of being detained on the filter screen from the filter screen upper surface landing to the mud hole discharge, collect.
Compared with the prior art, the utility model has the following beneficial effects:
1. a closed polishing environment is formed by polishing the shell, so that the cooling liquid and the waste chips only splash in the polishing area and then fall into the liquid collecting area for separation, and the cooling liquid and the waste chips are conveniently and easily collected;
2. the high-end reciprocating sliding of the filter screen is realized by reasonably utilizing the rotating power of the grinding wheel through the reciprocating transmission part, so that the cooling liquid and the scraps can be quickly separated, and the cooling liquid and the scraps can be conveniently collected.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is a partial enlarged view of portion B of FIG. 1;
fig. 4 is a partial sectional view taken along line C-C of fig. 2.
Reference numerals in the drawings of the specification include: the grinding device comprises a grinding shell 1, a filter screen 2, a grinding area 3, a liquid collecting area 4, a grinding wheel 5, a cooling liquid spray head 6, a slag discharging hole 7, a connector 8, a driving shaft 9, a supporting spring 10, a top block 11, a resisting rod 12, a motor 13, a limiting head 121, a straight rod section 122, a return spring 14, a telescopic device 15, a transmission plate 16, a telescopic rod 17, a locking sleeve 18, a mounting ring 181, a locking screw 182, a screen 19, a fence 20 and a liquid receiving cup 21.
Detailed Description
The present invention will be described in further detail below by way of specific embodiments:
as shown in fig. 1, an embodiment of the present invention provides a steel pipe end face grinding machine, which includes a grinding housing 1 at the middle inside and a filter screen 2 obliquely arranged in the grinding housing 1, wherein the filter screen 2 divides the inside of the grinding housing 1 into a grinding area 3 and a liquid collecting area 4 which are distributed up and down, a grinding wheel 5 is rotatably arranged in the grinding area 3, a plurality of grinding through holes located on one side of a grinding surface of the grinding wheel 5 are formed in a side wall of the grinding area 3, and a plurality of cooling liquid nozzles 6 arranged toward the grinding surface of the grinding wheel 5 are arranged on an inner wall of the grinding area 3;
the side wall of the liquid collection area 4 is provided with a slag discharge hole 7 positioned at the lower end of the filter screen 2, the lower end of the filter screen 2 is rotatably connected with the side wall of the liquid collection area 4, the high end of the filter screen 2 is slidably connected with the inner wall of the liquid collection area 4 along the rotating path of the inner wall, a reciprocating transmission member is arranged between the polishing wheel 5 and the high end of the filter screen 2, and the reciprocating transmission member enables the high end of the filter screen 2 to slide in a reciprocating manner by the rotating power of the polishing wheel 5.
The staff all inserts a steel pipe from each through-hole department of polishing, the terminal surface that makes every steel pipe all offsets with the face of polishing of wheel 5 of polishing, wheel 5 of polishing rotates, a plurality of coolant liquid shower nozzles 6 spray the coolant liquid to the face of polishing of wheel 5 of polishing, come to cool down the steel pipe of the in-process of polishing, take away the sweeps that produces simultaneously, the coolant liquid is mingled with the sweeps and gets into collecting area 4 from the district of polishing 3, separate coolant liquid and sweeps through filter screen 2, the coolant liquid passes filter screen 2 and collects in collecting area 4, sweeps wheel 5 is at the operation in-process, make filter screen 2 high-end reciprocating sliding through reciprocating transmission spare, thereby make the sweeps of being detained on the filter screen 2 from filter screen 2 upper surface landing to row's cinder hole 7 discharges, collect.
A closed polishing environment is formed by polishing the shell 1, so that the cooling liquid and the waste chips only splash in the polishing area 3 and then fall into the liquid collecting area 4 for separation, and the cooling liquid and the waste chips are conveniently and easily collected; the power of the grinding wheel 5 rotating is reasonably utilized to enable the high end of the filter screen 2 to slide in a reciprocating mode through the reciprocating transmission part, so that the cooling liquid and the scraps can be separated quickly, and the cooling liquid and the scraps can be collected conveniently.
In the embodiment, a liquid guide channel communicated with each cooling liquid spray head 6 is formed in the side wall of the grinding shell 1, and a joint 8 communicated with the liquid guide channel is fixedly arranged on the outer wall of the grinding shell 1; the cooling liquid is supplied to the cooling liquid spray head 6 by supplying the cooling liquid at the joint 8.
With reference to fig. 1, 2 and 4, the reciprocating transmission member practically used in the utility model comprises a driving shaft 9 penetrating through the inside and outside of a polishing shell 1 and connected with a polishing wheel 5, and a supporting spring 10 connected between the bottom of the high end of the filter screen 2 and the inner wall of a liquid collecting area 4, wherein an adjusting hole positioned above the high end of the filter screen 2 is formed in the side wall of the polishing shell 1, an adjusting cavity positioned outside the driving shaft 9 is formed in the side wall of the polishing shell 1, the adjusting hole is communicated with the adjusting cavity, at least one top block 11 freely rotating in the adjusting cavity is arranged on the outer wall of the driving shaft 9, the top blocks 11 are circumferentially and uniformly distributed on the outer wall of the driving shaft 9 when the number of the top blocks is larger than 1, a resisting rod 12 is slidably clamped in the adjusting hole, one end of the resisting rod 12 is slidably abutted against any top block 11, and the other end is slidably abutted against the high end of the filter screen 2.
The driving shaft 9 can be driven to rotate by a motor 13 arranged outside the grinding shell 1 to provide power for the operation of the grinding wheel 5; the drive shaft 9 comes intermittent type and offsets through kicking block 11 with the one end of propping to pole 12 in the rotation process to make and prop to pole 12 and remove in the regulation hole, the other end intermittent type that props to pole 12 offsets with filter screen 2 is high-end, the elasticity of cooperation supporting spring 10 is flexible, make and prop to pole 12 and reciprocate sliding in the regulation hole, filter screen 2 is high-end to carry out reciprocating swing around its rotation tie point, thereby be favorable to sweeps and coolant liquid separation on filter screen 2 and the removal of sweeps at filter screen 2 upper surface.
The number of the top blocks 11 can be adjusted according to actual requirements, and only one top block 11 is shown in the drawing of the present embodiment.
And the 4 inner walls in collection liquid district can also be opened and have the arc slide of arranging along the 2 high-end reciprocating sliding direction of filter screen, and 2 high-ends of filter screen are connected with the spacing post that slides and set up in the arc slide to make 2 high-ends of filter screen more stable at the reciprocating sliding in-process.
The adopted adjusting hole comprises a large hole section communicated with the adjusting cavity and a small hole section communicated with the large hole section, the abutting rod 12 comprises a limiting head 121 which is arranged in the large hole section in a sliding mode and used for abutting against the top block 11 in a sliding mode and a straight rod section 122 which is arranged in the small hole section in a sliding mode, one end of the straight rod section 122 is connected with the limiting head 121, and the other end of the straight rod section 122 abuts against the high end of the filter screen 2 in a sliding mode.
The adjusting holes are designed into the large hole section and the small hole section, the abutting rod 12 is designed into the limiting head 121 and the straight rod section 122 in a matching mode, the limiting head 121 limits the movement of the abutting rod 12 in the sliding process of the large hole section, and the abutting rod 12 is prevented from sliding down from the adjusting holes.
Meanwhile, in order to improve the sliding fit between the abutting rod 12 and the top block 11, the end surface of the limiting head 121 for sliding abutting against the top block 11 is a smooth arc surface, and the end surface of each top block 11 for sliding abutting against the limiting head 121 is also a smooth arc surface. The limiting head 121 and the top block 11 are both in sliding and abutting by adopting cambered surfaces, so that the abutting rod 12 can stably slide in the adjusting hole in a reciprocating manner by matching the top block 11 with the supporting spring 10, and the filter screen 2 can swing in a reciprocating manner. In this embodiment, the limiting head 121 is a hemispherical block, and the top block 11 is an arc-shaped block.
In addition, in order to improve the reciprocating capability of the support rod 12, a plurality of return springs 14 are connected between the limiting head 121 and the inner wall of the large hole section, and the extension direction of each return spring 14 is consistent with the moving direction of the limiting head 121. The restoring capacity of the abutting rod 12 after being disengaged from the top block 11 is improved by a plurality of restoring springs 14.
As shown in fig. 1, according to another embodiment of the present invention, the steel pipe end surface polisher further includes an auxiliary pressing mechanism disposed on an outer wall of the polishing housing 1, the auxiliary pressing mechanism includes a telescopic device 15 fixedly disposed outside the polishing housing 1, specifically, the telescopic device 15 is fixed by connecting the outer wall of the telescopic device 15 and the outer wall of the polishing housing 1 through a connecting frame, a telescopic shaft of the telescopic device 15 faces a side wall of the polishing region 3 with polishing through holes, the telescopic shaft of the telescopic device 15 is fixedly connected with a transmission plate 16, the transmission plate 16 is connected with a side wall of the polishing region 3 with polishing through holes through a plurality of telescopic rods 17, the transmission plate 16 is further fixedly connected with a plurality of locking sleeves 18, and the locking sleeves 18 are aligned with the polishing through holes one-to-one; the steel pipe is locked and fixed after sliding into the locking sleeve 18.
After steel pipes are inserted into each locking sleeve 18 for fixing, one end of each steel pipe close to the polishing wheel 5 is flush, the telescopic shaft of the telescopic device 15 extends to enable a plurality of steel pipes to penetrate through a plurality of polishing through holes in a one-to-one correspondence mode and then abut against the polishing surface of the polishing wheel 5, and the polishing wheel 5 can rapidly polish the end surfaces of the plurality of steel pipes when in operation; a plurality of telescopic links 17 come to lead for the flexible of expansion bend 15 to improve expansion bend 15's flexible stability, make the one-to-one that many steel pipes can be accurate pass a plurality of wearing holes of polishing.
The jack 15 may be a pneumatic cylinder in this embodiment.
For a plurality of wearing holes of polishing of reasonable overall arrangement in this embodiment, be the annular with a plurality of wearing holes of polishing and arrange, then a plurality of locking cover 18 also are the annular and arrange, and the staff of being convenient for arranges many steel pipes and carries out the tip on this steel pipe terminal surface polisher and polish, perhaps will polish the steel pipe of completion and take off.
With reference to fig. 1 and 3, each locking sleeve 18 employed in the present invention includes a mounting ring 181 fixedly coupled to the driving plate 16 and a locking screw 182 threadedly coupled to the mounting ring 181, the locking screw 182 being slidably disposed on an inner or outer side of a ring shape of the mounting ring 181 in a radial direction thereof. The steel pipe is inserted into the mounting ring 181 and is locked and fixed through the locking screw 182; the structure is simple.
As shown in fig. 1, according to another embodiment of the utility model, the steel pipe end face grinding machine further comprises a screen 19 connected to the outer wall of the liquid collecting region 4 and located below the deslagging hole 7, a fence 20 is arranged on the top of the screen 19 along the edge of the screen 19, a liquid receiving cup 21 is fixedly arranged at the bottom of the screen 19, and the liquid receiving cup 21 is communicated with the inside of the liquid collecting region 4.
Because a small amount of cooling liquid flows away from the upper surface of the filter screen 2 in the reciprocating swinging process of the filter screen 2, the scraps are further filtered by the screen 19, and the cooling liquid passes through the screen 19 and then is guided into the liquid collection area 4; the enclosure 20 forms a waste receiving recess in the screen 19 to allow a quantity of waste to be collected on the screen 19.
The cooling liquid collected in the liquid collecting area 4 can be recycled.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims (10)

1. A steel pipe end face grinding machine is characterized by comprising a grinding shell in the middle of the interior and a filter screen obliquely arranged in the grinding shell, wherein the filter screen divides the grinding shell into a grinding area and a liquid collecting area which are distributed up and down;
the liquid collecting area is characterized in that a slag discharging hole at the low end of the filter screen is formed in the side wall of the liquid collecting area, the low end of the filter screen is rotationally connected with the side wall of the liquid collecting area, the high end of the filter screen is connected with the inner wall of the liquid collecting area in a sliding mode along a rotating path of the inner wall of the liquid collecting area, a reciprocating transmission part is arranged between the polishing wheel and the high end of the filter screen, and the reciprocating transmission part enables the high end of the filter screen to slide in a reciprocating mode through the rotating power of the polishing wheel.
2. The steel pipe end face sander according to claim 1, characterized in that: reciprocating drive spare is including wearing to establish in the casing of polishing, outside and with the drive shaft that the wheel of polishing links to each other and connect the supporting spring between filter screen high-end bottom and collection liquid district inner wall, it has the regulation hole that is located filter screen high-end top to polish to open in the casing lateral wall, it has the regulation chamber that is located the drive shaft outside to polish to open in the casing lateral wall, regulation hole and regulation chamber intercommunication, set up the kicking block of a free rotation in adjusting the intracavity on the drive shaft outer wall at least, the circumference equipartition is on the drive shaft outer wall when kicking block quantity is greater than 1, sliding joint has the pole of supporting in the regulation hole, the one end and arbitrary kicking block of pole slide and offset, the other end and the filter screen high-end slide and offset.
3. The steel pipe end face sander according to claim 2, characterized in that: the adjusting hole comprises a large hole section communicated with the adjusting cavity and a small hole section communicated with the large hole section, the abutting rod comprises a limiting head and a straight rod section, the limiting head is arranged in the large hole section in a sliding mode and used for sliding and abutting against the ejector block, the straight rod section is arranged in the small hole section in a sliding mode, one end of the straight rod section is connected with the limiting head, and the other end of the straight rod section is in sliding and abutting against the high end of the filter screen.
4. The steel pipe end face sander according to claim 3, characterized in that: the end face of the limiting head, which is used for sliding and abutting against the ejector block, is a smooth cambered surface.
5. The grinding machine for the end face of the steel pipe according to claim 3 or 4, wherein: a plurality of reset springs are connected between the limiting head and the inner wall of the large hole section, and the stretching direction of each reset spring is consistent with the moving direction of the limiting head.
6. The steel pipe end face sander according to claim 4, characterized in that: the end face of each jacking block, which is used for abutting against the limiting head, is also a smooth cambered surface.
7. A grinding machine for end faces of steel pipes according to any one of claims 1 to 4, characterized in that: the outer wall of the polishing shell is provided with an auxiliary pressing mechanism, the auxiliary pressing mechanism comprises a telescopic device fixedly arranged outside the polishing shell, a telescopic shaft of the telescopic device faces a polishing area side wall provided with a polishing through hole, the telescopic shaft of the telescopic device is fixedly connected with a transmission plate, the transmission plate is connected with the polishing area side wall provided with the polishing through hole through a plurality of telescopic rods, the transmission plate is also fixedly connected with a plurality of locking sleeves, and the locking sleeves and the polishing through holes are arranged in an aligned mode in a one-to-one correspondence mode; the steel pipe slides into the locking sleeve and then is locked and fixed.
8. The steel pipe end face sander according to claim 7, characterized in that: each locking cover all includes the collar that links to each other with the driving plate is fixed and the locking screw that links to each other with the collar thread, and locking screw slides along collar radial direction and arranges in its annular inboard or outside.
9. The steel pipe end face sander according to claim 7, characterized in that: the grinding through holes are annularly arranged.
10. A grinding machine for end faces of steel pipes according to any one of claims 1 to 4, characterized in that: the liquid collecting area is characterized in that a screen below the deslagging hole is connected to the outer wall of the liquid collecting area, a fence is arranged on the top of the screen along the edge of the screen, a liquid receiving cup is fixedly arranged at the bottom of the screen, and the liquid receiving cup is communicated with the inside of the liquid collecting area.
CN202121979189.5U 2021-08-20 2021-08-20 Steel pipe terminal surface polisher Expired - Fee Related CN216066745U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202121979189.5U CN216066745U (en) 2021-08-20 2021-08-20 Steel pipe terminal surface polisher

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202121979189.5U CN216066745U (en) 2021-08-20 2021-08-20 Steel pipe terminal surface polisher

Publications (1)

Publication Number Publication Date
CN216066745U true CN216066745U (en) 2022-03-18

Family

ID=80671400

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202121979189.5U Expired - Fee Related CN216066745U (en) 2021-08-20 2021-08-20 Steel pipe terminal surface polisher

Country Status (1)

Country Link
CN (1) CN216066745U (en)

Similar Documents

Publication Publication Date Title
CN116061063B (en) Take circulation to retrieve grinding machine tool for compressor of function
CN104889125A (en) Device for cleaning inner wall of oil cylinder
CN115056033B (en) Machining lathe
CN114714529A (en) Inner hole polishing equipment for jewelry processing
CN216066745U (en) Steel pipe terminal surface polisher
CN215240214U (en) Grinding disc surface cleaning equipment for grinding machine
CN109175325B (en) Automatic cleaning equipment for cast flange pipe
CN108942550A (en) A kind of working method of the maintenance facility of mold
CN219541737U (en) Drilling equipment is used in metal accessory production
CN115970796A (en) Mining machinery stone crushing equipment
CN213615832U (en) Grinding device is used in processing of mine machine structure
CN215547098U (en) Efficient vertical machining center
CN210476565U (en) Bearing ring double-end-face grinding device
CN212664942U (en) Multi-hole drilling device
CN210546832U (en) Floating reamer
JPH1058303A (en) Honing machine for inner surface of cylinder
JPH0744442Y2 (en) Machine tool grinding fluid supply device
CN211728672U (en) Discharging device for grinding machine for grinding outer groove of bearing inner ring
CN213317809U (en) Drilling mechanism for machining hardware gear
CN220944601U (en) Sanding device
CN104493637A (en) Cutting fluid recycling device
CN214770817U (en) Cooling system for rocker arm drilling machine
CN221337510U (en) Five-axis turning and milling combined machining tool
CN221754754U (en) Radial drilling machine capable of preventing flying chips
CN220699268U (en) Polishing device for rock drill bit production

Legal Events

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: 20220318