CN114211235A - Installation guide device of bolt stretcher for reactor pressure vessel - Google Patents
Installation guide device of bolt stretcher for reactor pressure vessel Download PDFInfo
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- CN114211235A CN114211235A CN202111622918.6A CN202111622918A CN114211235A CN 114211235 A CN114211235 A CN 114211235A CN 202111622918 A CN202111622918 A CN 202111622918A CN 114211235 A CN114211235 A CN 114211235A
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- layer guide
- guide
- pressure vessel
- middle layer
- positioning table
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
- B23P19/06—Screw or nut setting or loosening machines
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- Mechanical Engineering (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to an installation guide device of a reactor pressure vessel bolt stretcher, which comprises: the upper layer guide, the middle layer guide and the lower layer guide are sequentially arranged from bottom to top, and are of bilaterally symmetrical and detachable structures. The device can play a role in guiding and positioning the installation of the bolt stretcher when the bolt stretcher for the reactor pressure vessel is installed on the pressure vessel, and simultaneously does not influence the normal use of the bolt stretcher.
Description
Technical Field
The invention belongs to the field of nuclear power station reactor maintenance, and particularly relates to an installation guide device of a reactor pressure vessel bolt stretcher.
Background
The first-stage project of the Tianwan nuclear power plant is two VVER-1000 type units, the reactor is a B-428 type reactor, and the sealing of the reactor pressure vessel and the top cover of the upper component is realized by the common matching of 54 main bolts, 54 main nuts, 108 hemispherical gaskets and 2 nickel gaskets. The sealing principle is that 54 main bolts are stretched by using a bolt stretcher, and the sealing of the top cover of the upper assembly is ensured under the action of the pretightening force of the bolts. The bolt stretcher mainly comprises a hydraulic unit, a working platform, a reaction nut driving motor, a support ring, a hydraulic cylinder, a control element, a manipulator, a transformer, a control console and the like. Through remote automatic operation, 54 main bolts can be synchronously and uniformly stretched, and the exposure dose of workers and the number of the workers are reduced. Meanwhile, as the unsealing and sealing work of the reactor pressure vessel is one of the most important works in the reactor maintenance, and all the work is positioned on the major repair critical path, when the main bolt stretcher breaks down, the major influence on the major repair critical path and the node can be generated.
The centering condition of the bolt stretcher mounted on the reactor pressure vessel is a key prerequisite for the success of the bolt stretcher in the subsequent use, and procedures of screwing bolts by using a manipulator of the bolt stretcher have strict requirements on the centering of the bolt stretcher. Two guide structures are originally designed on two sides of the bolt stretcher, and the bolt stretcher is matched with guide rails on two sides of the reactor shaft to ensure the vertical hoisting of the bolt stretcher in the reactor shaft, so that the bolt stretcher and the reactor pressure vessel are accurately centered and installed. When the bolt stretcher is used for the first time, the original guide is clamped in the middle of a guide rail of a reactor vertical shaft and cannot ascend or descend normally, and then the hydraulic jack is used for taking out the guide. When the pressure vessel seal is overhauled for the first time by the No. 1 unit of the Tianwan nuclear power station, the guide of the bolt stretcher is clamped in the middle of the guide rail of the reactor vertical shaft again, and the bolt stretcher is normally placed into the reactor vertical shaft after the guide is removed. Therefore, after the first overhaul of the unit No. 1 of the nuclear power plant in the Tianwan, the bolt stretcher is not used for guiding when the reactor bolt stretcher is placed on the reactor top cover. And subsequently, when the reactor pressure vessel bolt stretcher falls down, hoisting personnel check the gap between the original guide position of the bolt stretcher and the guide rail of the reactor shaft from top to bottom beside the reactor shaft, and the bolt stretcher falls down on the premise of not colliding with the guide rail of the reactor shaft by observing the gaps between the original guide positions of the bolt stretcher on two sides and the guide rail of the reactor shaft. Meanwhile, before the bolt stretcher falls down, the serial number of the reaction nut of the bolt stretcher is checked to be consistent with that of the main bolt. When the bolt stretcher falls to be close to the head of the main bolt, the bolt stretcher falls slowly, and a crane adjusts the position of the bolt stretcher so that the main bolt is positioned in the center of a reaction nut hole of the bolt stretcher.
After the original guide of the bolt stretcher is removed, the bolt stretcher can smoothly pass through a vertical shaft guide rail of the reactor, but when the bolt stretcher is installed in place, a crane worker needs to visually check the gap between the bolt stretcher and a bolt nut, and the gap is ensured to be uniform. However, in the actual operation process, the situation that the moment alarm occurs when the manipulator of the bolt stretching machine screws the bolt occasionally occurs, in this case, the bolt stretching machine needs to be hoisted again and installed again after adjustment, and the major repair time of the critical path is delayed. The reason why the accurate installation of the bolt stretcher cannot be effectively ensured before and after the guide dismantling of the original bolt stretcher is analyzed has the following aspects:
1. the original design guide structure of the reactor pressure vessel bolt stretcher is deviated from the size of a stretcher body due to the deviation of a reactor shaft civil engineering guide rail structure, so that the original guide structure is easily jammed when being contacted with a reactor shaft guide rail during hoisting of the bolt stretcher, and the vertical hoisting cannot be smoothly carried out through the shaft guide rail;
2. the clearance between the external dimension of the reactor pressure vessel bolt stretcher and the outer side of the whole reactor vertical shaft guide rail is small, even if new guide is redesigned on the outer side of the stretcher, the coordination with the reactor vertical shaft guide rail is difficult to ensure, the clamping phenomenon still occurs in the hoisting process possibly, and the equipment is damaged and cannot be dismantled;
3. when the reactor pressure vessel bolt stretcher is installed on a pressure vessel, a hole at the bottom of the reactor pressure vessel bolt stretcher is matched with a main nut on the pressure vessel, and after the main bolt enters the hole at the bottom of the stretcher, the gap between the main nut and the periphery of the hole is small, so that a guide structure cannot be nested or installed at the periphery of the main bolt and the main nut;
4. reactor pressure vessel bolt stretcher bottom round hole is narrow structure in the lower width, if at other direction of pressure vessel king bolt top installation, after bolt stretcher targetting in place, the direction gets into bolt stretcher bottom round hole after, the direction can harm the inside spare part of bolt stretcher because of the collision on the one hand, and on the other hand direction gets into and can't demolish behind the stretcher bottom round hole inside.
In summary, in combination with the equipment structure and the actual field situation, it is urgently needed to develop an installation guide device for a bolt stretcher for a reactor pressure vessel, which can overcome the difficulties and risks, realize the installation and centering of the bolt stretcher, and ensure the reliability of subsequent bolt screwing and stretching operations by using the bolt stretcher.
Disclosure of Invention
The invention aims to provide a mounting guide device for a bolt stretcher of a reactor pressure vessel, which can play a role in guiding and positioning the mounting of the bolt stretcher when the bolt stretcher of the reactor pressure vessel is mounted on the pressure vessel, and does not influence the normal use of the bolt stretcher.
The technical scheme for realizing the purpose of the invention is as follows:
a reactor pressure vessel bolt tensioner installation guide, said guide comprising: the upper layer guide, the middle layer guide and the lower layer guide are sequentially arranged from bottom to top, and are of bilaterally symmetrical and detachable structures.
The bilateral symmetry structure interface of upper strata direction aligns with the bilateral symmetry structure interface of lower floor's direction, and the bilateral symmetry structure interface of middle level direction is 90 degrees with the bilateral symmetry structure interface of upper strata direction, lower floor's direction.
The upper layer guide appearance is a circular ring structure, the inner part is hollow, the outer side is a narrow-top wide-bottom structure, the upper part of the periphery is an inclined plane, the top end of the upper layer guide is a plane, and the bottom of the upper layer guide is an irregular staggered structure.
The irregular staggered structure of upper layer direction bottom includes that upper strata direction draw-in groove, upper strata direction are location platform and upper strata direction brace table down, and upper strata direction draw-in groove, upper strata direction are location platform and upper strata direction brace table down and are the loop configuration, and two halves structure about following the upper strata direction and divide into.
The middle layer guide is in a circular ring structure, the inner part of the middle layer guide is hollow, the outer side of the middle layer guide is in a smooth surface structure, and the upper part and the bottom of the middle layer guide are both in irregular staggered structures.
The irregular staggered structure at the upper part and the bottom of the middle layer guide comprises an upper middle layer guide positioning table, a middle layer guide clamping groove, a lower middle layer guide positioning table and a middle layer guide supporting table, wherein the upper middle layer guide positioning table, the middle layer guide clamping groove, the lower middle layer guide positioning table and the middle layer guide supporting table are all of an annular structure and are divided into a left half structure and a right half structure along with the middle layer guide, and the upper middle layer guide positioning table is matched with the upper layer guide clamping groove and the upper layer guide lower positioning table.
The lower layer of guide appearance is the ring structure, and inside cavity is as the fixed part in bottom of guider and nut adapter installation, and the bottom circumference is the reducing part, and lower layer of guide upper portion and bottom are irregular stagger structure.
The irregular staggered structure of lower floor's direction upper portion and bottom includes that the direction of lower floor goes up location platform, lower floor's direction brace table and lower floor's direction location platform down, and the direction of lower floor goes up location platform, lower floor's direction brace table and lower floor's direction down the location platform and is the loop configuration, and two halves structures about following the direction of lower floor, and the direction of lower floor goes up location platform and middle level direction draw-in groove, middle level direction down the location platform cooperate, and lower floor's direction brace table, lower floor's direction down the location platform cooperate with the nut adapter.
The upper layer guide, the middle layer guide and the lower layer guide are all made of nylon materials.
The invention has the beneficial technical effects that:
1. the installation device of the bolt stretcher for the reactor pressure vessel adopts a three-section structure, and when the bolt stretcher is installed on the pressure vessel, the bolt stretcher can be separated layer by layer from bottom to top after entering a round hole at the bottom of the bolt stretcher in an installation guide way;
2. the installation device of the reactor pressure vessel bolt stretcher provided by the invention adopts a detachable structure, and after the guide enters a round hole at the bottom of the bolt stretcher, each section is separated, and the separated section of guide can be detached in half;
3. the installation device of the reactor pressure vessel bolt stretcher provided by the invention adopts a staggered fixing structure, and the guide is segmented and detachable, so that the interior of the guide is fixed by a staggered clamping groove, and the phenomenon of falling off in a free state after correct installation can be avoided;
4. the installation device of the reactor pressure vessel bolt stretcher provided by the invention adopts an internal positioning structure, can realize the guiding installation and positioning by matching with the nut adapter on the main bolt, and can still realize the matching and positioning with the nut adapter at the upper section after the bottom section is removed;
5. the installation device for the bolt stretcher of the reactor pressure vessel provided by the invention adopts a nylon material, the material has a lubricating and guiding function, and the damage to the equipment structure caused by collision of a metal material is prevented.
Drawings
FIG. 1 is a perspective view of a reactor pressure vessel bolt stretcher installation guide device provided in the present invention;
FIG. 2 is a schematic structural diagram of a reactor pressure vessel bolt stretcher installation guide device provided by the invention;
FIG. 3 is a view A-A of FIG. 2;
fig. 4 is a schematic installation diagram of a reactor pressure vessel bolt stretcher installation guide device provided by the invention.
In the figure: 1-upper layer guiding; 2, guiding the middle layer; 3, guiding the lower layer; 4-upper layer guiding clamping groove; 5-guiding the middle layer to an upper positioning table; 6-middle layer guide clamping groove; 7-guiding the lower layer to an upper positioning table; 8-guiding the upper layer to a lower positioning table; 9-upper layer guiding support platform; 10-guiding the middle layer to a lower positioning table; 11-a middle layer guide support table; 12-a lower layer guide support platform; 13-lower layer guiding lower positioning table; 14-nut adapter fixing bolts; 15-a nut adaptor; 16-main nut.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 3, the present invention provides a reactor pressure vessel bolt stretcher installation guide device, including: upper strata direction 1, middle level direction 2 and lower floor's direction 3, upper strata direction 1, middle level direction 2 and lower floor's direction 3 install in proper order from lower to upper, and upper strata direction 1, middle level direction 2, lower floor's direction 3 are bilateral symmetry and detachable structure. The upper layer guide 1, the middle layer guide 2 and the lower layer guide 3 are all made of nylon materials.
As shown in fig. 1, the bilateral symmetry structure interface of the upper layer guide 1 is aligned with the bilateral symmetry structure interface of the lower layer guide 3, and the bilateral symmetry structure interface of the middle layer guide 2 is 90 degrees with the bilateral symmetry structure interface of the upper layer guide 1 and the lower layer guide 3.
As shown in figure 1, the upper layer guide 1 is in a circular ring structure, the inner part is hollow, the outer side is in a narrow-top and wide-bottom structure, the upper part of the periphery is an inclined plane which is used as an initial guide conical surface, and the top end of the upper layer guide 1 is a plane. The upper layer guide 1 is divided into a left symmetrical structure and a right symmetrical structure.
As shown in fig. 3, the bottom of the upper layer guide 1 is of an irregular staggered structure and is divided into an upper layer guide clamping groove 4, an upper layer guide lower positioning table 8 and an upper layer guide supporting table 9. The upper layer guide clamping groove 4, the upper layer guide lower positioning table 8 and the upper layer guide supporting table 9 are all of an annular structure and are divided into a left half structure and a right half structure along with the upper layer guide 1. The upper layer guide clamping groove 4, the upper layer guide lower positioning table 8 and the middle layer guide upper positioning table 5 are matched to be used for fixing the upper layer guide 1.
As shown in fig. 1, the middle layer guide 2 has a circular ring structure, a hollow interior and a smooth surface structure on the outer side, and serves as a middle transition stage of the guide structure. The middle layer guide 2 is divided into a left symmetrical structure and a right symmetrical structure.
As shown in fig. 3, the upper portion and the bottom portion of the middle layer guide 2 are both of an irregular staggered structure, and are divided into an upper middle layer guide positioning table 5, a middle layer guide clamping groove 6, a lower middle layer guide positioning table 10, and a middle layer guide supporting table 11, wherein the upper middle layer guide positioning table 5, the middle layer guide clamping groove 6, the lower middle layer guide positioning table 10, and the middle layer guide supporting table 11 are all of an annular structure, and are divided into a left half structure and a right half structure along with the middle layer guide 2. The middle layer guide clamping groove 6 and the middle layer guide lower positioning table 10 are matched with the lower layer guide upper positioning table 7 to be used as the fixation of the middle layer guide 2.
As shown in fig. 1, the lower guide 3 has a circular ring structure, and is hollow inside, and serves as a bottom fixing portion for mounting the guide device and the nut adapter 15, and the bottom circumference is a diameter-variable portion. The lower layer guide 3 is divided into a left and a right two-half symmetrical structure.
As shown in fig. 3, the upper part and the bottom of the lower layer guide 3 are of irregular staggered structures and are divided into an upper lower layer guide positioning table 7, a lower layer guide supporting table 12 and a lower layer guide positioning table 13, and the upper lower layer guide positioning table 7, the lower layer guide supporting table 12 and the lower layer guide positioning table 13 are all of annular structures and are divided into a left half structure and a right half structure along with the lower layer guide 3. The lower layer guiding upper positioning table 7 is matched with the middle layer guiding clamping groove 6 and the middle layer guiding lower positioning table 10 to be used as the fixation of the middle layer guiding 2. The lower guide support table 12 and the lower guide lower positioning table 13 are matched with the nut adapter 15 to be used as initial installation and fixation of the whole guide device.
When the bolt stretcher is installed on the reactor pressure vessel during the unsealing and sealing of the reactor pressure vessel, three guide devices are symmetrically installed on three pressure vessel main bolt and nut adapters 15, after the bolt stretcher enters the guide devices, the guide devices are dismantled layer by layer from bottom to top until the bolt stretcher is installed on the reactor pressure vessel, and all the guide devices are dismantled. As shown in fig. 4, the specific steps of using the guide device are as follows:
(1) assembling and installing the left half part and the right half part of the lower layer guide 3 on a main bolt and nut adapter 15 of the pressure vessel by hand, and matching the lower layer guide support table 12 and the lower layer guide lower positioning table 13 with the nut adapter 15;
(2) the left half part and the right half part of the middle layer guide 2 are assembled and installed on the lower layer guide 3 by hands, and the formation interface of the middle layer guide 2 and the lower layer guide 3 forms an angle of 90 degrees. The lower layer guide upper positioning table 7 is matched with the middle layer guide clamping groove 6 and the middle layer guide lower positioning table 10 to be used as the fixation of the middle layer guide 2;
(3) the left half part and the right half part of the upper layer guide 1 are assembled and installed on the middle layer guide 2 by hands, and the formation interface of the upper layer guide 1 and the middle layer guide 2 forms an angle of 90 degrees. The upper layer guide clamping groove 4 and the upper layer guide lower positioning table 8 are matched with the middle layer guide upper positioning table 5 to be used for fixing the upper layer guide 1;
(4) after the pressure vessel bolt stretcher enters the upper layer guide 1 of the guide device, the holding middle layer guide 2 is lifted upwards by hands, and the lower layer guide 3 is half-and-half detached and taken away from the bottom. Then the upper layer guide 1 and the middle layer guide 2 are put down and mounted on a nut adapter 15, and the middle layer guide lower positioning table 10, the middle layer guide support table 11 and the nut adapter 15 are matched to play a role in mounting and fixing;
(5) after the pressure vessel bolt stretcher continuously enters the upper layer guide 1 of the guide device, the upper layer guide 1 is held by hands to be lifted upwards, and the middle layer guide 2 is half-and-half detached and taken away from the bottom. Then the upper layer guide 1 is put down and installed on the nut adapter 15, and the upper layer guide lower positioning table 8 and the upper layer guide supporting table 9 are matched with the nut adapter 15 to play a role in installation and fixation;
(6) after the pressure vessel bolt stretcher continues to enter the upper layer guide 1 of the guide device, the upper layer guide 1 is half-and-half detached, and then the bolt stretcher is put down in place.
The guide device is arranged on the nut by utilizing the structural characteristics of the main nut of the reactor pressure vessel. When the peripheral diameter does not block the installation of the stretcher, the guide device is positioned and guided through the detachable structure, and the guide device can be detached when the bolt stretcher is installed on the reactor pressure vessel. The normal installation and use of the bolt stretcher are realized.
The installation guide device of the reactor pressure vessel bolt stretcher is successfully applied to the unsealing and sealing periods of the main joint surface of the reactor pressure vessel in the first-stage engineering of the nuclear power plant in the Tianwan province, and the normal installation and use of the bolt stretcher are realized.
The guide device can be popularized and applied to the related equipment of the same type of units. The guiding device can be popularized to the installation of other similar equipment of a power station. The guide device has good reference significance for the installation of other similar equipment in the same industry.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (9)
1. A reactor pressure vessel bolt tensioner installation guide, comprising: the upper layer guide (1), the middle layer guide (2) and the lower layer guide (3) are sequentially arranged from bottom to top, and the upper layer guide (1), the middle layer guide (2) and the lower layer guide (3) are of bilateral symmetry and are of detachable structures.
2. The reactor pressure vessel bolt stretcher installation guide device as claimed in claim 1, characterized in that the bilateral symmetry structure interface of the upper layer guide (1) is aligned with the bilateral symmetry structure interface of the lower layer guide (3), and the bilateral symmetry structure interface of the middle layer guide (2) is 90 degrees with the bilateral symmetry structure interface of the upper layer guide (1) and the lower layer guide (3).
3. The installation guide device of the bolt stretcher for the reactor pressure vessel is characterized in that the upper layer guide (1) is in a circular ring structure, the inside of the upper layer guide (1) is hollow, the outer side of the upper layer guide (1) is in a narrow-top and wide-bottom structure, the upper part of the periphery of the upper layer guide (1) is an inclined plane, the top end of the upper layer guide (1) is a plane, and the bottom of the upper layer guide (1) is in an irregular staggered structure.
4. The installation guide device of the bolt stretcher for the reactor pressure vessel as claimed in claim 3, wherein the irregular staggered structure at the bottom of the upper layer guide (1) comprises an upper layer guide clamping groove (4), an upper layer guide lower positioning table (8) and an upper layer guide supporting table (9), the upper layer guide clamping groove (4), the upper layer guide lower positioning table (8) and the upper layer guide supporting table (9) are all annular structures and are divided into a left half structure and a right half structure along with the upper layer guide (1).
5. The installation guide device of the reactor pressure vessel bolt stretcher according to claim 4, characterized in that the middle layer guide (2) has a circular ring structure, a hollow interior, a smooth and smooth surface structure on the outer side, and irregular staggered structures on the upper part and the bottom part of the middle layer guide (2).
6. The installation guide device of the reactor pressure vessel bolt stretcher according to claim 5, characterized in that the irregular staggered structure at the upper part and the bottom of the middle layer guide (2) comprises a middle layer guide upper positioning table (5), a middle layer guide clamping groove (6), a middle layer guide lower positioning table (10) and a middle layer guide supporting table (11), wherein the middle layer guide upper positioning table (5), the middle layer guide clamping groove (6), the middle layer guide lower positioning table (10) and the middle layer guide supporting table (11) are all ring-shaped structures and are divided into a left half structure and a right half structure along with the middle layer guide (2), and the middle layer guide upper positioning table (5) is matched with the upper layer guide clamping groove (4) and the upper layer guide lower positioning table (8).
7. The installation guide device of the bolt stretcher for the reactor pressure vessel is characterized in that the lower layer guide (3) is of a circular ring structure, the inner part of the lower layer guide is hollow and is used as a bottom fixing part for installing the guide device and a nut adapter (15), the circumference of the bottom of the lower layer guide is a diameter-variable part, and the upper part and the bottom of the lower layer guide (3) are of an irregular staggered structure.
8. The installation guide device of the bolt stretcher for the reactor pressure vessel as claimed in claim 7, wherein the irregular staggered structure at the upper part and the bottom part of the lower layer guide (3) comprises a lower layer guide upper positioning table (7), a lower layer guide supporting table (12) and a lower layer guide lower positioning table (13), the lower layer guide upper positioning table (7), the lower layer guide supporting table (12) and the lower layer guide lower positioning table (13) are all in an annular structure and are divided into a left half structure and a right half structure along with the lower layer guide (3), the lower layer guide upper positioning table (7) is matched with the middle layer guide clamping groove (6) and the middle layer guide lower positioning table (10), and the lower layer guide supporting table (12) and the lower layer guide lower positioning table (13) are matched with the nut adapter (15).
9. The reactor pressure vessel bolt stretcher installation guide device as claimed in claim 8, characterized in that the upper layer guide (1), the middle layer guide (2) and the lower layer guide (3) are all made of nylon material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111622918.6A CN114211235A (en) | 2021-12-28 | 2021-12-28 | Installation guide device of bolt stretcher for reactor pressure vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111622918.6A CN114211235A (en) | 2021-12-28 | 2021-12-28 | Installation guide device of bolt stretcher for reactor pressure vessel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114211235A true CN114211235A (en) | 2022-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111622918.6A Pending CN114211235A (en) | 2021-12-28 | 2021-12-28 | Installation guide device of bolt stretcher for reactor pressure vessel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114211235A (en) |
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2021
- 2021-12-28 CN CN202111622918.6A patent/CN114211235A/en active Pending
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