CN211136988U - Disassembling tool for grinding roller sleeve of Raymond mill - Google Patents
Disassembling tool for grinding roller sleeve of Raymond mill Download PDFInfo
- Publication number
- CN211136988U CN211136988U CN201921970396.7U CN201921970396U CN211136988U CN 211136988 U CN211136988 U CN 211136988U CN 201921970396 U CN201921970396 U CN 201921970396U CN 211136988 U CN211136988 U CN 211136988U
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- China
- Prior art keywords
- grinding roller
- roller
- sleeve
- hydraulic jack
- limiting
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Abstract
The utility model discloses an assembly and disassembly tools of raymond mill grinding roller shell, assembly and disassembly tools include: the grinding roller cover, dismouting box and hydraulic jack, the external diameter of at least part of grinding roller cover is crescent in the direction from centre to both ends, the grinding roller cover chamber has been prescribed a limit to the dismouting box, the grinding roller cover is established at grinding roller cover intracavity, the top of dismouting box is equipped with the locating part, be equipped with on the locating part and dismantle the gag lever post that links to each other with the locating part, the axial displacement of gag lever post and grinding roller cover's periphery wall cooperation in order to prescribe a limit to the grinding roller cover, hydraulic jack has the movable shaft that axial displacement and diameter along the roller axle are less than the roller axle chamber, hydraulic jack control movable shaft drives the axial displacement of roller along the roller axle. Utilize hydraulic jack to push the movable roll axle and remove, drive grinding roller shell and roller axle and take place axial relative movement, not only can promote the dynamics that the roller axle removed, can also reduce staff's intensity of labour by a wide margin, can not cause the damage to the grinding roller shell moreover.
Description
Technical Field
The utility model belongs to the technical field of the raymond machine technique and specifically relates to a mounting and dismounting tool of raymond machine grinding roller shell is related to.
Background
At present, the roller sleeve of the grinding roller of the domestic Raymond mill is disassembled and assembled mainly by adopting a manual disassembling mode of heating the roller sleeve and then smashing and removing the roller sleeve by using a hammer, so that the defects of low working efficiency, easy damage to the roller shaft and high safety risk exist. Meanwhile, the roller sleeve of the grinding roller is maintained and replaced frequently, so that the labor intensity of maintenance personnel is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a it is big to solve the raymond machine grinding roller shell and dismantle the degree of difficulty, provides an assembly and disassembly tools of raymond machine grinding roller shell, the assembly and disassembly tools of raymond machine grinding roller shell can promote the dismantlement efficiency of grinding roller shell.
According to the utility model discloses assembly and disassembly tools of raymond mill grinding roller shell, include: the roller shaft assembly comprises a roller sleeve, a disassembly box and a hydraulic jack, wherein a roller shaft cavity extending along the axial direction of the roller sleeve is limited in the roller sleeve, a roller shaft is arranged in the roller shaft cavity, the roller shaft is in interference fit with the roller shaft cavity, the outer diameter of at least one part of the roller sleeve is gradually increased from the middle to two ends, the disassembly box is limited with a roller sleeve cavity with an open top and an open front end, the roller sleeve is arranged in the roller sleeve cavity, the top of the disassembly box is provided with a limiting part, the limiting part is provided with a limiting rod detachably connected with the limiting part, the limiting rod is matched with the outer peripheral wall of the roller sleeve to limit the axial displacement of the roller sleeve, the hydraulic jack is arranged in the roller sleeve cavity, and is provided with a movable shaft moving along the axial direction of the roller shaft and having a diameter smaller than that of the roller shaft cavity, the hydraulic jack controls the movable shaft to drive the roller shaft to move along the axial direction of the roller shaft.
According to the utility model discloses assembly and disassembly tools of raymond machine grinding roller cover and control method thereof utilizes the cooperation of dismouting box and hydraulic jack, prescribes a limit to the grinding roller cover on the dismouting box, adopts hydraulic jack to push movable roll axle and removes, can drive grinding roller cover and roller from this and take place axial relative movement, and then can separate grinding roller cover and roller. On the one hand, adopt hydraulic jack to push the movable roll axle and remove, can promote the dynamics that the roller removed, prevent that grinding roller shell from cooperating too tightly with the roller and being difficult to the separation, on the other hand, hydraulic jack replaces staff to dismantle, reduces staff's intensity of labour by a wide margin, can not cause the damage to grinding roller shell moreover.
According to the utility model discloses an embodiment, the unpacking box includes: bottom plate, left side board, right side board, backplate, left stopper and right stopper, the left side board is connected the left side of bottom plate and with the bottom plate sets up perpendicularly, the right side board is connected the right side of bottom plate and with the bottom plate sets up perpendicularly, the backplate is connected the rear side of bottom plate the rear side of left side board with between the rear side of right side board, the bottom plate the left side board the right side board with the backplate cooperation is injectd grinding roller cover chamber, left side stopper is established the top of left side board, right side stopper is established the top of right side board, left side stopper with right stopper cooperation forms the locating part, the gag lever post cooperation is in left side stopper with between the right stopper.
According to the utility model discloses an embodiment in the width direction of bottom plate, the position of left stopper with the position of right stopper sets up relatively.
According to the utility model discloses an embodiment, left side stopper with right side stopper's structure is the same, left side stopper with right side stopper all forms into right trapezoid, two upper and lower limits of right trapezoid all with left side board parallel arrangement, right trapezoid have two right angled waist orientations the backplate sets up.
According to the utility model discloses an embodiment, be formed with on the stopper of a left side and open left spacing groove backward, be formed with on the stopper of the right side with left side spacing groove structure is the same and the open right spacing groove backward, the left end cooperation of gag lever post is in left side spacing inslot, the right-hand member cooperation of gag lever post is in right side spacing inslot.
According to the utility model discloses an embodiment, left side spacing groove with right side spacing groove forms into with the same arc of gag lever post diameter.
According to the utility model discloses an embodiment, the loose axle is followed hydraulic jack's front end stretches out, hydraulic jack's rear end ends to be in on the backplate.
According to the utility model discloses an embodiment, grinding roller shell includes: the roller shaft comprises an intermediate main body part, a rear end part and a front end part, wherein the intermediate main body part is formed into a cylindrical structure, a part of the roller shaft cavity is limited in the intermediate main body part, the rear end part is connected to the rear end of the intermediate main body part, the outer diameter of the rear end part is larger than that of the intermediate main body part, the front end part is connected to the front end of the intermediate main body part, and the outer diameter of the front end part is larger than that of the intermediate main body part; the limiting rod is matched with the rear end part or the front end part to limit the axial displacement of the grinding roller sleeve.
Drawings
FIG. 1 is a schematic structural view of a disassembling tool for a grinding roller sleeve of a Raymond mill according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for controlling the disassembling tool according to an embodiment of the present invention.
In the figure:
100: a disassembling tool;
10: a grinding roller sleeve; 11: a roll shaft; 12: an intermediate body portion;
13: a rear end portion; 14: a front end portion;
20: disassembling the box; 21: a base plate; 22: a left side plate; 23: a right side plate;
24: a back plate; 25: a left stop block; 26: a right stopper;
30: a hydraulic jack; 31: a movable shaft;
40: a limiting rod.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
The following describes a disassembly and assembly tool 100 of a Raymond mill grinding roller shell 10 and a control method thereof according to an embodiment of the present invention with reference to the accompanying drawings.
As shown in fig. 1, a disassembling tool 100 for a grinding roller sleeve 10 of a raymond mill according to an embodiment of the present invention comprises: a grinding roller sleeve 10, a dismounting box 20 and a hydraulic jack 30.
Specifically, a roller shaft 11 cavity extending along the axial direction of the grinding roller sleeve 10 is defined in the grinding roller sleeve 10, a roller shaft 11 is arranged in the roller shaft 11 cavity, the roller shaft 11 is in interference fit in the roller shaft 11 cavity, and the grinding roller sleeve 10 is sleeved on the roller shaft 11 and rotates along with the roller shaft 11 in the working process of the Raymond mill.
Wherein, the dismouting box 20 is prescribed a limit to have top and the open grinding roller shell 10 chamber in front end, grinding roller shell 10 is established at grinding roller shell 10 intracavity, the top of dismouting box 20 is equipped with the locating part, be equipped with on the locating part and dismantle the gag lever post 40 that links to each other with the locating part, because the external diameter of at least a part of grinding roller shell 10 is crescent in the direction from the centre to both ends, gag lever post 40 can cooperate with the periphery wall of grinding roller shell 10 in order to prescribe a limit to the axial displacement of grinding roller shell 10, for example, the distance between gag lever post 40 and grinding roller shell 10 chamber bottom wall is fixed and is less than the biggest external diameter of grinding roller shell 10, gag lever post 40 can prevent on the periphery wall of grinding roller shell 10 that grinding roller shell 10 from removing by the joint.
The hydraulic jack 30 is arranged in the cavity of the grinding roller sleeve 10, the hydraulic jack 30 is provided with a movable shaft 31 moving along the axial direction of the roller shaft 11, the outer diameter of the movable shaft 31 is smaller than the inner diameter of the cavity of the roller shaft 11, the movable shaft 31 moves forward or backward under the control action of the hydraulic jack 30, the movable shaft 31 is pressed against the roller shaft 11 and then controls the movable shaft 31 to move forward, and then the hydraulic jack 30 controls the movable shaft 31 to drive the roller shaft 11 to move along the axial direction of the roller shaft 11, so that the roller shaft 11 moves, the grinding roller sleeve 10 is fixed, and the grinding roller sleeve 10 can be separated from the roller shaft 11.
Therefore, according to the utility model discloses the assembly and disassembly tools 100 of raymond machine grinding roller cover 10 and control method thereof utilize the cooperation of knock-out box 20 and hydraulic jack 30, prescribe a limit to grinding roller cover 10 on knock-out box 20, adopt hydraulic jack 30 to promote roller 11 and remove, can drive grinding roller cover 10 and roller 11 from this and take place axial relative movement, and then can separate grinding roller cover 10 and roller 11. On the one hand, adopt hydraulic jack 30 to promote the roller 11 and remove, can promote the dynamics that roller 11 removed, prevent that grinding roller shell 10 from cooperating too tightly with roller 11 and being difficult to the separation, on the other hand, hydraulic jack 30 replaces the staff and dismantles, reduces staff's intensity of labour by a wide margin, can not lead to the fact the damage to grinding roller shell 10 moreover.
According to an embodiment of the present invention, the dismounting box 20 includes: bottom plate 21, left side board 22, right side board 23, backplate 24, left stopper 25 and right stopper 26, left side board 22 is connected in the left side of bottom plate 21 and is set up perpendicularly with bottom plate 21, right side board 23 is connected on the right side of bottom plate 21 and is set up perpendicularly with bottom plate 21, backplate 24 is connected at the rear side of bottom plate 21, between the rear side of left side board 22 and the rear side of right side board 23, bottom plate 21, left side board 22, right side board 23 and backplate 24 cooperation are injectd grinding roller cover 10 chamber, left stopper 25 is established at the top of left side board 22, right stopper 26 is established at the top of right side board 23, left stopper 25 forms the locating part with right stopper 26 cooperation, gag lever post 40 cooperation is between left stopper 25 and right stopper 26.
Wherein, the bottom plate 21, the left side board 22, the right side board 23, the backplate 24, left stopper 25 and right stopper 26 all adopt thickness to be 20 mm's Q345 steel sheet cutting and form, bottom plate 21, the left side board 22, the right side board 23, backplate 24, weld between the adjacent part of left stopper 25 and right stopper 26 and link to each other, and left stopper 25 can with left side board 22 integrated into one piece, right stopper 26 can with right side board 23 integrated into one piece, not only can promote the rigidity and the structural strength of individual part in the dress box 20 of tearing open from this, and can promote dress box 20 overall structure's stability.
According to the utility model discloses an embodiment, on bottom plate 21's width direction, left stopper 25's position sets up with right stopper 26's position relatively, through left stopper 25 and the right stopper 26 of relative setting about setting up, can guarantee the stability and the reliability of gag lever post 40 cooperation between left stopper 25 and right stopper 26, prevents that gag lever post 40 slope from influencing gag lever post 40 and grinding roller shell 10 complex stability.
According to the utility model discloses an embodiment, left stopper 25 is the same with right stopper 26's structure, and left stopper 25 and right stopper 26 all form into right trapezoid, two upper and lower limits of right trapezoid all with left side plate 22 parallel arrangement, right trapezoid have two right angled waists towards backplate 24 settings.
That is, the front side edges of the left stopper 25 and the right stopper 26 are formed as oblique edges that are inclined forward from top to bottom, and the rear side edges of the left stopper 25 and the right stopper 26 are formed as straight edges that extend in the vertical direction. The hypotenuse setting of front side can promote the stability of being connected in left stopper 25 and the ascending connection in right stopper 26 fore-and-aft direction, has promoted the area of being connected between left stopper 25 and left side plate 22 and the area of being connected between right stopper 26 and right side plate 23, and then can promote the stability of locating part. The straight edge of the rear side is provided with a limiting rod 40, a left limiting block 25 and a right limiting block 26, so that the matching stability of the limiting rod 40, the left limiting block 25 and the right limiting block 26 can be improved, and the limiting blocks are prevented from sliding forwards when the grinding roller sleeve 10 is stressed forwards.
According to the utility model discloses an embodiment is formed with to the open left spacing groove in backward on the left stopper 25, is formed with the same and open right spacing groove in backward with left spacing groove structure on the right stopper 26, and the left end cooperation of gag lever post 40 is at left spacing inslot, and the right-hand member cooperation of gag lever post 40 is at right spacing inslot. Wherein, the left and right spacing grooves are formed in an arc shape having the same diameter as the spacing rod 40. Through setting up left spacing groove and right spacing groove, can promote the cooperation stability of gag lever post 40 and left stopper 25 and right stopper 26, prevent that gag lever post 40 from sliding and leading to grinding roller shell 10 and gag lever post 40 to break away from.
According to the utility model discloses an embodiment, loose axle 31 stretches out from hydraulic jack 30's front end, and hydraulic jack 30's rear end ends to on backplate 24, decides hydraulic jack 30 on backplate 24, and backplate 24 can provide the holding power for hydraulic jack 30, and then guarantees that hydraulic jack 30 can provide sufficient thrust for roller 11 and make grinding roller shell 10 break away from with roller 11.
According to an embodiment of the utility model, grinding roller shell 10 includes: a middle body 12, a rear end 13 and a front end 14, the middle body 12 being formed in a cylindrical structure, a part of the cavity of the roller shaft 11 being defined in the middle body 12, the rear end 13 being connected to the rear end of the middle body 12, the rear end 13 having an outer diameter larger than that of the middle body 12, the front end 14 being connected to the front end of the middle body 12, the front end 14 having an outer diameter larger than that of the middle body 12; the limit rod 40 cooperates with the rear end 13 or the front end 14 to limit the axial displacement of the grinding roller shell 10.
That is to say, grinding roller shell 10 forms into the dumbbell type structure that the diameter of the little both ends of diameter is big in the middle of the diameter, and gag lever post 40 can cooperate in the great position department of grinding roller shell 10 diameter, prevents that grinding roller shell 10 from taking place axial displacement, and then injects grinding roller shell 10 and remove, for gag lever post 40 cooperation injects grinding roller shell 10 and provides convenience, can promote the stability that gag lever post 40 injectd grinding roller shell 10 moreover.
As shown in fig. 2, the method for controlling the dismounting tool 100 of the grinding roller sleeve 10 of the raymond mill according to the embodiment of the present invention comprises the following steps: s1, fixing the hydraulic jack 30 in the cavity of the grinding roller sleeve 10; s2, placing the grinding roller sleeve 10 in a cavity of the grinding roller sleeve 10, and arranging the roller shaft 11 of the grinding roller sleeve 10 opposite to the movable shaft 31 of the hydraulic jack 30; s3, mounting the limiting rod 40 on the limiting piece, and matching the limiting rod 40 with the grinding roller sleeve 10 to limit the axial displacement of the grinding roller sleeve 10; s4, controlling the hydraulic jack 30 to drive the movable shaft 31 to move forwards, stopping the movable shaft 31 against the roller shaft 11 and driving the roller shaft 11 to generate axial relative displacement relative to the grinding roller sleeve 10 until the roller shaft 11 is separated from the grinding roller sleeve 10.
Specifically, the top and the front end of the dismounting box 20 are open, the hydraulic jack 30 can be placed into the grinding roller sleeve 10 cavity through the top or the front end of the dismounting box 20, the rearmost end of the hydraulic jack 30 abuts on the back plate 24, then the grinding roller sleeve 10 is placed in the grinding roller sleeve 10 cavity, the grinding roller sleeve 10 is arranged front and back, and the roller shaft 11 in the grinding roller sleeve 10 abuts on the movable shaft 31 of the hydraulic jack 30, wherein the roller shaft 11 and the movable shaft 31 can be ensured to be coaxially arranged by selecting the size of the hydraulic jack 30 and a cushion layer, and the diameter of the movable shaft 31 is smaller than that of the roller shaft 11 cavity.
Then, the limiting rod 40 is fitted to the limiting member, for example, the limiting rod 40 may be horizontally disposed on the left side plate 22 and the right side plate 23, the front end of the limiting rod 40 abuts against the rear edges of the left limiting block 25 and the right limiting block 26, or the end of the limiting rod 40 is fitted in the left limiting groove and the right limiting groove.
At this time, if the limiting rod 40 cannot be matched with the outer peripheral wall of the grinding roller sleeve 10 in a limited way, the hydraulic jack 30 is controlled to push the roller shaft 11 and the grinding roller sleeve 10 to move forwards until the outer peripheral wall of the grinding roller sleeve 10 can be fixedly matched with the limiting rod 40. Or the movable shaft 31 of the hydraulic jack 30 is firstly contracted to ensure that the part of the grinding roller sleeve 10, which can be matched with the limiting rod 40, is positioned behind the limiting rod 40, and then the hydraulic jack 30 is controlled to push the grinding roller sleeve 10 to advance until the grinding roller sleeve 10 is matched with the limiting rod 40.
When the outer surface of the grinding roller sleeve 10 is fixedly matched on the limiting rod 40, the hydraulic jack 30 is controlled to drive the movable shaft 31 to move forwards continuously, the movable shaft 31 stops against the roller shaft 11 and drives the roller shaft 11 to generate axial relative displacement relative to the grinding roller sleeve 10 until the roller shaft 11 is separated from the grinding roller sleeve 10.
The above is the preferred embodiment of the present invention, and the technical personnel in the field of the present invention can also change and modify the above embodiment, therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by the technical personnel in the field on the basis of the present invention all belong to the protection scope of the present invention.
Claims (8)
1. A disassembly and assembly tool (100) of a Raymond mill grinding roller sleeve (10), characterized by comprising:
the grinding roller sleeve (10) is internally defined with a roller shaft (11) cavity extending along the axial direction of the grinding roller sleeve (10), a roller shaft (11) is arranged in the roller shaft (11) cavity, the roller shaft (11) is in interference fit in the roller shaft (11) cavity, and the outer diameter of at least one part of the grinding roller sleeve (10) is gradually increased from the middle to two ends;
the roller sleeve assembly comprises an assembling box (20), wherein the assembling box (20) is limited to a grinding roller sleeve (10) cavity with an open top and an open front end, the grinding roller sleeve (10) is arranged in the grinding roller sleeve (10) cavity, a limiting piece is arranged at the top of the assembling box (20), a limiting rod (40) detachably connected with the limiting piece is arranged on the limiting piece, and the limiting rod (40) is matched with the outer peripheral wall of the grinding roller sleeve (10) to limit the axial displacement of the grinding roller sleeve (10);
hydraulic jack (30), hydraulic jack (30) are established grinding roller shell (10) intracavity, hydraulic jack (30) have along the axial displacement and the diameter of roller (11) are less than loose axle (31) in roller (11) chamber, hydraulic jack (30) control loose axle (31) drive roller (11) are followed the axial displacement in roller (11).
2. A dismantling tool (100) for a Raymond mill roll sleeve (10) according to claim 1, characterized in that said dismantling box (20) comprises:
a base plate (21);
the left side plate (22), the left side plate (22) is connected to the left side of the bottom plate (21) and is perpendicular to the bottom plate (21);
the right side plate (23) is connected to the right side of the bottom plate (21) and is perpendicular to the bottom plate (21);
a back plate (24), wherein the back plate (24) is connected among the rear side of the bottom plate (21), the rear side of the left side plate (22) and the rear side of the right side plate (23), and the bottom plate (21), the left side plate (22) and the right side plate (23) are matched with the back plate (24) to define a cavity of the grinding roller sleeve (10);
the left limiting block (25), the left limiting block (25) is arranged at the top of the left side plate (22);
the right limiting block (26), the right limiting block (26) is arranged at the top of the right side plate (23), the left limiting block (25) is matched with the right limiting block (26) to form the limiting part, and the limiting rod (40) is matched between the left limiting block (25) and the right limiting block (26).
3. A mounting and dismounting tool (100) for a Raymond mill roll sleeve (10) according to claim 2, characterized in that the left stop block (25) is located opposite to the right stop block (26) in the width direction of the bottom plate (21).
4. The disassembling tool (100) for a Raymond mill roll sleeve (10) according to claim 3, characterized in that the left limiting block (25) and the right limiting block (26) are identical in structure, the left limiting block (25) and the right limiting block (26) are both formed into a right trapezoid, the upper side and the lower side of the right trapezoid are both arranged in parallel with the left side plate (22), and the waist of the right trapezoid with two right angles is arranged towards the back plate (24).
5. The disassembling tool (100) for the roller sleeve (10) of the Raymond mill roller according to claim 4, wherein a left limiting groove which is open backwards is formed on the left limiting block (25), a right limiting groove which is identical in structure with the left limiting groove and is open backwards is formed on the right limiting block (26), the left end of the limiting rod (40) is matched in the left limiting groove, and the right end of the limiting rod (40) is matched in the right limiting groove.
6. A mounting and dismounting tool (100) for a Raymond mill roll shell (10) according to claim 5, characterized in that said left and right limiting grooves are formed in an arc shape having the same diameter as said limiting rod (40).
7. Tool (100) for the disassembly and assembly of a Raymond mill roll sleeve (10) according to claim 6, characterized in that said movable shaft (31) protrudes from the front end of said hydraulic jack (30), the rear end of said hydraulic jack (30) resting on said back plate (24).
8. A mounting and dismounting tool (100) for a Raymond mill roll sleeve (10) according to claim 7, characterized in that said mill roll sleeve (10) comprises:
an intermediate body portion (12), the intermediate body portion (12) being formed as a cylindrical structure, a portion of the roller shaft (11) cavity being defined within the intermediate body portion (12);
a rear end portion (13), wherein the rear end portion (13) is connected to the rear end of the middle main body portion (12), and the outer diameter of the rear end portion (13) is larger than that of the middle main body portion (12);
a front end portion (14), wherein the front end portion (14) is connected to the front end of the middle body portion (12), and the outer diameter of the front end portion (14) is larger than the outer diameter of the middle body portion (12);
the limiting rod (40) cooperates with the rear end (13) or the front end (14) to limit the axial displacement of the grinding roller sleeve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921970396.7U CN211136988U (en) | 2019-11-14 | 2019-11-14 | Disassembling tool for grinding roller sleeve of Raymond mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921970396.7U CN211136988U (en) | 2019-11-14 | 2019-11-14 | Disassembling tool for grinding roller sleeve of Raymond mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211136988U true CN211136988U (en) | 2020-07-31 |
Family
ID=71773541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921970396.7U Expired - Fee Related CN211136988U (en) | 2019-11-14 | 2019-11-14 | Disassembling tool for grinding roller sleeve of Raymond mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211136988U (en) |
-
2019
- 2019-11-14 CN CN201921970396.7U patent/CN211136988U/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 |
Granted publication date: 20200731 Termination date: 20211114 |
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| CF01 | Termination of patent right due to non-payment of annual fee |