CN112975835A - Segment opening device for slab caster sector segment and method for removing pin shaft - Google Patents
Segment opening device for slab caster sector segment and method for removing pin shaft Download PDFInfo
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- CN112975835A CN112975835A CN202110154653.5A CN202110154653A CN112975835A CN 112975835 A CN112975835 A CN 112975835A CN 202110154653 A CN202110154653 A CN 202110154653A CN 112975835 A CN112975835 A CN 112975835A
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- 238000003466 welding Methods 0.000 claims description 23
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 abstract description 14
- 238000012797 qualification Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 230000011218 segmentation Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
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Abstract
The invention discloses a segment opening device for a sector section of a slab caster and a method for removing a pin shaft, belongs to the field of maintenance of spare parts of the caster, and aims to improve the maintenance efficiency. Comprises a screw rod, a jacking tool for erecting a jack and a connecting nut fixed on a pin shaft; the connecting nut is coaxially welded on the outer end face of the pin shaft; a through hole is formed in the top tool; the inner end of the screw rod is in threaded fit connection with the connecting nut, and the outer end of the screw rod penetrates through the through hole in the jacking tool and is movably connected with the jacking tool along the axial direction of the jacking tool; and a limiting device is arranged between the screw rod and the jacking tool, and the jacking tool is detachably connected to the screw rod through the limiting device. According to the invention, the connection between the connecting nut and the pin shaft is more reliable. Need not to get off coupling nut after the maintenance, reduced the damage risk that round pin axle welds repeatedly and causes. The screw rod is connected with the jacking tool and the connecting nut, so that the dismounting is fast, and the jacking tool can be used repeatedly. When the pin shaft is dismantled, the dismantling qualification rate reaches 99%, and the maintenance efficiency is improved within 30-40 minutes after one pin shaft is dismantled.
Description
Technical Field
The invention belongs to the field of maintenance of spare parts of continuous casting machines, and particularly relates to a segment opening device for a segment of a slab continuous casting machine and a method for removing a pin shaft.
Background
And disassembling inner and outer arcs of the spare parts of the fan-shaped sections of the plate blanks, namely opening the fan-shaped sections for short. The method for disassembling the pin shaft by conventional segmentation comprises the following steps: the T-shaped steel plate support is welded on the connecting pin shaft, after welding is completed, the distance between the T-shaped steel plate support and the fan-shaped section shell of the slab caster forms a jack mounting area, a jack is erected in the jack mounting areas on two sides of the T-shaped steel plate support respectively, one end of the jack abuts against the fan-shaped section shell of the slab caster, the other end of the jack abuts against the T-shaped steel plate support, the fan-shaped section shell of the slab caster is used as a force application fulcrum, and the pin shaft is ejected out. This method has the following problems:
one is as follows: the steel plate is required to be used for blanking before the pin shaft is dismantled, the T-shaped steel plate is welded on the pin shaft, the T-shaped steel plate is required to be cut after the pin shaft is ejected out, and the workload is large. A series of processes from blanking to T-shaped steel plate cutting are completed, and one pin shaft is removed in about 4 hours.
The second step is as follows: the steps are repeated when the next maintenance is carried out, the pin shaft needs to be welded repeatedly, the pin shaft is damaged, spare parts of the pin shaft need to be machined again, and the maintenance cost is increased.
And thirdly: in the actual pin shaft dismantling construction process, part of the pin shafts of the sector sections are tightly matched with the pin holes, so that the welding seams of the T-shaped steel plates and the pin shafts are broken. The pin shaft cannot be taken out and needs to be reworked.
Disclosure of Invention
The invention aims to solve the problem of low efficiency when the conventional segmentation device is used for maintaining the fan-shaped segment of a slab casting machine, and provides the segmentation device for the fan-shaped segment of the slab casting machine and a method for disassembling a pin shaft.
The technical scheme adopted by the invention is as follows: the slab caster sector section opening device comprises a bracket forming a jack mounting area with a slab caster sector section shell, wherein the bracket comprises a screw rod, a jacking tool for erecting a jack and a connecting nut fixed on a pin shaft; the connecting nut is coaxially welded on the outer end face of the pin shaft; a through hole is formed in the top tool; the inner end of the screw rod is in threaded fit connection with the connecting nut, and the outer end of the screw rod penetrates through the through hole in the jacking tool and is movably connected with the jacking tool along the axial direction of the jacking tool; and a limiting device is arranged between the screw rod and the jacking tool, and the jacking tool is detachably connected to the screw rod through the limiting device.
Furthermore, the top tool comprises a top plate and side plates on two sides of the top plate, a groove-shaped structure with an outward opening is formed by surrounding the top plate and the side plates, and the through holes are formed in the top plate.
Furthermore, a reinforcing rib is arranged between the top plate and the side plate and is positioned in a groove-shaped area formed by the top plate and the side plate in an enclosing mode.
Furthermore, the limiting device comprises a base plate and a locking nut; the backing plate passes the lead screw by the outer end of lead screw and supports and lean on the top utensil, lock nut and lead screw thread fit are connected, and the backing plate is located between top utensil and the lock nut.
Furthermore, the top tool comprises a top plate and side plates on two sides of the top plate, a groove-shaped structure with an outward opening is formed by the top plate and the side plates in an enclosing mode, and the through holes are formed in the top plate;
the backing plate includes square backing plate and circular backing plate, square backing plate is located between circular backing plate and the roof, square backing plate passes the lead screw and supports and lean on the curb plate.
A method for dismantling a pin shaft at the sector section of a slab casting machine,
welding a connecting nut on the outer end face of the pin shaft, wherein the connecting nut is coaxial with the pin shaft and the outer diameter of the connecting nut is smaller than that of the pin shaft; the inner end of the screw rod is connected with a connecting nut in a threaded manner, and the outer end of the screw rod sequentially penetrates through a through hole of the jacking tool, the base plate and the locking nut in a threaded manner;
adjusting the position of a locking nut on a screw rod to enable the distance between the inner side surface of a jacking tool and the shell of the sector section of the slab caster to be matched with the installation size of a jack;
thirdly, arranging a jack between the inner side surface of the jacking tool and the sector section shell of the slab caster, and erecting the jack on the jacking tool after adjusting the jack in place;
step four, extending the jack and ejecting the pin shaft;
and fifthly, detaching the jack and the screw rod of the jacking tool, and keeping the connecting nut on the pin shaft.
Furthermore, in the second step, the distance between the inner side surface of the jacking tool and the fan-shaped section of the slab caster is D, and the height of the jack is H; D-H is more than or equal to 30mm and less than or equal to 50 mm.
The invention has the beneficial effects that: according to the invention, the connecting nut is welded on the pin shaft to serve as the connecting piece, the welding line between the connecting nut and the pin shaft is in a closed ring shape, the welding line strength is higher, the connection between the connecting nut and the pin shaft is more reliable, the risk of reworking caused by welding line fracture is reduced, and the overhauling efficiency is favorably improved. After the pin shaft is ejected, only the ejector needs to be detached, the connecting nut does not need to be taken off, and when the pin shaft is maintained next time, the connecting nut can be continuously put into use, so that the times of repeated welding operation on the pin shaft are reduced, and the risk of pin shaft damage is reduced. Meanwhile, the connecting nut dismounting and repeated welding processes are also saved, the maintenance time is favorably shortened, and the maintenance efficiency is improved. The jacking tool is connected with the connecting nut through the lead screw, the dismounting is fast and convenient, the damage of welding to the jacking tool is avoided, and the repeated use of the jacking tool is facilitated. The screw rod passes through the through hole on the jacking tool, and the position of the jacking tool along the axial direction of the screw rod is limited by the limiting device, so that the jacking tool is adjustable along the axial position of the screw rod, and the jack is suitable for jacks of various specifications and is more convenient to install.
When the sector section opening device of the slab caster is used for removing the pin shaft, the removal qualification rate of the pin shaft reaches more than 99 percent, and the time for removing one pin shaft is within 30-40 minutes, so that the maintenance efficiency is greatly improved.
Drawings
FIG. 1 is a schematic view of a segment opening device for a segment of a slab caster, which is disclosed by the invention;
fig. 2 is a schematic diagram of a structure of the top tool.
In the figure, a pin shaft 1, a connecting nut 2, a jacking device 3, a top plate 3A, a side plate 3B, a reinforcing rib 3C, a through hole 3D, a screw rod 4, a base plate 5, a square base plate 5A, a circular base plate 5B, a locking nut 6 and a jack 7.
Detailed Description
The invention is further described below with reference to the following figures and examples:
the slab caster sector segment opening device comprises a bracket forming a jack mounting area with a slab caster sector segment shell as shown in figure 1, wherein the bracket comprises a screw rod 4, a jacking tool 3 for erecting a jack 7 and a connecting nut 2 fixed on a pin shaft 1; the connecting nut 2 is coaxially welded on the outer end face of the pin shaft 1; the top tool 3 is provided with a through hole 3D; the inner end of the screw rod 4 is in threaded fit connection with the connecting nut 2, and the outer end of the screw rod passes through a through hole 3D in the top tool 3 and is movably connected with the top tool 3 along the axial direction of the top tool; a limiting device is arranged between the screw rod 4 and the jacking device 3, and the jacking device 3 is detachably connected to the screw rod 4 through the limiting device.
According to the invention, the connecting nut 2 is welded on the outer end face of the pin shaft 1 as the connecting piece, firstly, the welding seam between the connecting nut 2 and the pin shaft 1 is in a closed ring shape, compared with the traditional method that a T-shaped jacking tool is welded on the pin shaft 1 to form a linear welding seam, the welding seam has higher strength, the connection between the connecting nut 2 and the pin shaft 1 is more reliable, the risk of reworking caused by welding seam fracture is reduced, and the overhauling efficiency is favorably improved. The connecting nut 2 is welded to the outer end face of the pin shaft 1, and is not welded to the outer circumferential face of the pin shaft 1, so that the assembly face of the pin shaft 1 is not damaged.
The connecting nut 2 is coaxially welded on the outer end face of the pin shaft 1, and the fact that the central axis of the connecting nut 2 is superposed with the central axis of the pin shaft 1 is shown, so that stress balance can be guaranteed, and the pin shaft 1 can be conveniently and smoothly ejected under the jacking force action of the two jacks 7 on the two sides.
The outer end face of the pin shaft 1 refers to an end face which is exposed out of the pin hole and perpendicular to the axis after the pin shaft 1 is assembled in the pin hole.
Secondly, the connecting nut 2 only plays a role of assembling the jacking device 3 and the pin shaft 1 together, after the pin shaft 1 is ejected out, the jacking device 3 only needs to be detached, the connecting nut 2 does not need to be taken off, and the connecting nut 2 can be continuously put into use when the pin shaft 1 is maintained next time, so that the times of repeated welding operation on the pin shaft 1 are reduced, and the damage risk of the pin shaft 1 is reduced. Meanwhile, the process of disassembling and repeatedly welding the connecting nut 2 is also saved, the maintenance time is favorably shortened, and the maintenance efficiency is improved.
Thirdly, the top tool 3 and the connecting nut 2 are connected through the lead screw 4, the dismounting is fast and convenient, the damage of the welding to the top tool 3 is avoided, and the repeated use of the top tool 3 is facilitated.
Fourthly, once the traditional T-shaped jacking tool is installed on the pin shaft 1, the distance between the jacking tool and the fan-shaped section shell of the slab caster is determined, namely the size of the installation area of the jack is determined, so that the T-shaped jacking tool with one specification can only be suitable for jacks with corresponding specifications. Therefore, the T-shaped jack needs to be manufactured according to the specification of the jack to be used, and the jack with different specifications may have the problem of non-adaption. According to the invention, the screw rod 4 penetrates through the through hole 3D on the jacking device 3 to be movably connected with the jacking device 3 along the axial direction, namely, the jacking device 3 can move along the axial direction of the screw rod 4 to adjust the position of the jacking device 3 in the axial direction of the screw rod 4, so that the distance between the jacking device 3 and the sector section shell of the slab continuous casting machine is adjustable, namely the size of a jack mounting area is adjustable. And stop device's setting makes top utensil 3 connect on lead screw 4, avoids top utensil 3 from the outer end landing of lead screw 4, simultaneously, also plays the effect of injecing and adjusting the interval between top utensil 3 and the fan-shaped section casing of slab caster.
The inner end of the screw rod 4 described in the specification refers to the end of the screw rod 4 connected with the connecting nut 2, and the outer end of the screw rod 4 corresponds to the inner end.
The top member 3 may be a thick steel plate or a rectangular structure, etc. in the present invention, in order to facilitate screwing the lock nut 6, as shown in fig. 2, the top member 3 includes a top plate 3A and side plates 3B at two sides of the top plate 3A, a groove-shaped structure with an outward opening is formed by the top plate 3A and the side plates 3B, and the through hole 3D is disposed on the top plate 3A. Compared with a single thick steel plate, the trough-shaped roof 3 has higher strength; compared with a rectangular structure, the novel steel plate has the advantages that the strength requirement is met, the manufacturing material investment is less, the cost is saved, the weight is smaller, and the novel steel plate is easy to disassemble and assemble quickly.
In the invention, the top tool 3 can be formed by welding a top plate 3A and a side plate 3B, and the top plate 3A and the side plate 3B are both made of steel plates with the thickness of 30 mm.
In order to further improve the strength of the top 3, a reinforcing rib 3C is provided between the top plate 3A and the side plate 3B, and the reinforcing rib 3C is located in a groove-shaped region surrounded by the top plate 3A and the side plate 3B.
The limiting device can be a bolt and the like, and the bolt is inserted into a pin hole and then abutted against the ejection tool 3 to limit the ejection tool 3 on the screw rod 4 through the radial pin hole arranged on the screw rod 4. In the invention, the limiting device comprises a backing plate 5 and a locking nut 6; the backing plate 5 penetrates through the screw rod 4 from the outer end of the screw rod 4 to abut against the jacking tool 3, the locking nut 6 is in threaded fit connection with the screw rod 4, and the backing plate 5 is located between the jacking tool 3 and the locking nut 6. The structure is reliable in connection.
The backing plate 5 comprises a square backing plate 5A and a circular backing plate 5B, the square backing plate 5A is located between the circular backing plate 5B and the top plate 3A, and the square backing plate 5A penetrates through the screw rod 4 to abut against the side plate 3B. Because the top tool 3 is of a groove-shaped structure with an outward opening, the square base plate 5A is matched with the groove-shaped structure of the top tool 3, and the contact surface of the square base plate and the top tool 3 is larger. The diameter of the round backing plate 5B on the outer side is smaller than that of the inscribed circle of the square backing plate 5A, and the round backing plate 5B increases the distance between the square backing plate 5A and the locking nut 6, so that the locking nut 6 is assembled conveniently.
A method for dismantling a pin shaft at the sector section of a slab casting machine,
welding a connecting nut 2 on the outer end face of a pin shaft 1, wherein the connecting nut 2 is coaxial with the pin shaft 1 and the outer diameter of the connecting nut 2 is smaller than that of the pin shaft 1; the inner end of the screw rod 4 is in threaded connection with the connecting nut 2, and the outer end of the screw rod sequentially penetrates through the through hole 3D of the jacking tool 3, the backing plate 5 and the locking nut 6 to be in threaded connection;
adjusting the position of a locking nut 6 on a screw rod 4 to enable the distance between the inner side surface of a jacking tool 3 and the shell of the sector section of the slab caster to be matched with the installation size of a jack 7;
thirdly, placing a jack 7 between the inner side surface of the jacking device 3 and the sector section shell of the slab caster, and erecting the jack 7 on the jacking device 3 after adjusting the jack 7 to be in place;
step four, extending the jack 7 and ejecting the pin shaft 1;
and fifthly, removing the jack 3, the jack 7 and the screw rod 4, and keeping the connecting nut 2 on the pin shaft 1.
According to the method for dismantling the pin shaft in the sector section of the slab caster, the connecting nut 2 is welded on the outer end face of the pin shaft 1, and the connection is reliable; the screw rod 4 penetrates through the through hole 3D of the jacking tool 3 to be in threaded connection with the connecting nut 2, and the connection is convenient and quick, so that the jacking tool 3 can be quickly assembled and disassembled, and the jack 7 can be quickly installed.
The outer diameter of the connecting nut 2 is smaller than that of the pin shaft 1, so that the position of the outer end face of the pin shaft 1 is ensured to be enough for welding the connecting nut 2, and the difficulty of welding operation is reduced; and ensure that the welding position is on the outer end face of the pin shaft 1 and the outer circumferential surface of the pin shaft is not affected, namely, the assembly matching surface of the pin shaft is not damaged.
The connecting nut 2 and the pin shaft 1 are coaxial, so that the stress balance can be ensured, and the pin shaft can be conveniently and smoothly ejected out under the action of the jacking forces of the two jacks 7 on the two sides.
And after the pin shaft 1 is ejected, the connecting nut 2 does not need to be cut off, the pin shaft 1 with the connecting nut 2 is installed back to the pin hole after maintenance is completed, qualified spare parts are used online for offline maintenance after a certain period, the connecting nut 2 can be used repeatedly, and the processes of cutting off and re-welding by people are reduced.
According to the invention, when the sector section opening device of the slab caster is used for removing the pin shaft, the removal qualification rate of the pin shaft reaches more than 99%, and the time for removing one pin shaft is within 30-40 minutes, so that the overhaul efficiency is greatly improved.
Wherein, the inner side surface of the top 3 is the side surface of the top 3 opposite to the pin shaft 1. When the top 3 is a trough-shaped structure surrounded by the top plate 3A and the side plate 3B and having an outward opening, the inner side surface of the top 3 is the opposite side surface of the top plate 3A to the side plate 3B.
In order to facilitate the installation of the jack 7, in the second step, the distance between the inner side surface of the jacking device 3 and the fan-shaped section of the slab caster is D, and the height of the jack is H; D-H is more than or equal to 30mm and less than or equal to 50 mm.
Claims (7)
1. Slab caster fan-shaped section device of opening includes and forms the support in jack installing zone between the fan-shaped section casing of slab caster, its characterized in that: the support comprises a screw rod (4), a jacking tool (3) for erecting a jack (7) and a connecting nut (2) fixed on the pin shaft (1); the connecting nut (2) is coaxially welded on the outer end face of the pin shaft (1); a through hole (3D) is formed in the top tool (3); the inner end of the screw rod (4) is in threaded fit connection with the connecting nut (2), and the outer end of the screw rod penetrates through a through hole (3D) in the jacking tool (3) and is movably connected with the jacking tool (3) along the axial direction of the jacking tool; a limiting device is arranged between the screw rod (4) and the jacking tool (3), and the jacking tool (3) is detachably connected onto the screw rod (4) through the limiting device.
2. The segment opening device for the segment of the slab caster as claimed in claim 1, wherein: roof utensil (3) include curb plate (3B) of roof (3A) and roof (3A) both sides, surround by roof (3A) and curb plate (3B) and form the groove type structure that the opening is outwards, through-hole (3D) set up on roof (3A).
3. The segment opening device of the slab caster as claimed in claim 2, wherein: a reinforcing rib (3C) is arranged between the top plate (3A) and the side plate (3B), and the reinforcing rib (3C) is positioned in a groove-shaped area formed by the top plate (3A) and the side plate (3B) in a surrounding mode.
4. The segment opening device for the segment of the slab caster as claimed in claim 1, wherein: the limiting device comprises a base plate (5) and a locking nut (6); the backing plate (5) penetrates through the screw rod (4) from the outer end of the screw rod (4) and abuts against the jacking tool (3), the locking nut (6) is connected with the screw rod (4) in a threaded fit mode, and the backing plate (5) is located between the jacking tool (3) and the locking nut (6).
5. The segment opening device for the segment of the slab caster as claimed in claim 4, wherein: the roof device (3) comprises a roof plate (3A) and side plates (3B) on two sides of the roof plate (3A), a groove-shaped structure with an outward opening is formed by the roof plate (3A) and the side plates (3B) in a surrounding mode, and the through holes (3D) are formed in the roof plate (3A);
backing plate (5) are including square backing plate (5A) and circular backing plate (5B), square backing plate (5A) are located between circular backing plate (5B) and roof (3A), square backing plate (5A) pass lead screw (4) and support and lean on curb plate (3B).
6. The method for disassembling the pin shaft in the sector section of the slab caster is characterized in that:
welding a connecting nut (2) on the outer end face of a pin shaft (1), wherein the connecting nut (2) is coaxial with the pin shaft (1) and the outer diameter of the connecting nut is smaller than that of the pin shaft (1); the inner end of the screw rod (4) is in threaded connection with the connecting nut (2), and the outer end of the screw rod sequentially penetrates through the through hole (3D) of the jacking tool (3), the backing plate (5) and is in threaded connection with the locking nut (6);
adjusting the position of the locking nut (6) on the screw rod (4) to enable the distance between the inner side surface of the jacking tool (3) and the sector section shell of the slab continuous casting machine to be matched with the installation size of the jack (7);
thirdly, placing the jack (7) between the inner side surface of the jacking tool (3) and the sector section shell of the slab caster, and erecting the jack (7) on the jacking tool (3) after adjusting the jack (7) to be in place;
step four, extending the jack (7) and ejecting the pin shaft (1);
and fifthly, detaching the jack (7) and the screw rod (4) of the jacking device (3), and keeping the connecting nut (2) on the pin shaft (1).
7. The method for removing the pin shaft in the sector section of the slab casting machine according to claim 6, wherein the method comprises the following steps: in the second step, the distance between the inner side surface of the jacking tool (3) and the fan-shaped section of the slab continuous casting machine is D, and the height of the jack (7) is H; D-H is more than or equal to 30mm and less than or equal to 50 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110154653.5A CN112975835B (en) | 2021-02-04 | 2021-02-04 | Slab continuous casting machine sector section opening device and method for dismantling pin shaft |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110154653.5A CN112975835B (en) | 2021-02-04 | 2021-02-04 | Slab continuous casting machine sector section opening device and method for dismantling pin shaft |
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| CN112975835B CN112975835B (en) | 2023-04-21 |
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| CN205465961U (en) * | 2016-01-05 | 2016-08-17 | 淮北矿业股份有限公司 | Device is demolishd to mechanically fastening round pin |
| CN205968844U (en) * | 2016-06-26 | 2017-02-22 | 上海梅山科技发展有限公司 | Cover dismounting device in middle of fan -shaped section |
| CN206913060U (en) * | 2017-05-25 | 2018-01-23 | 中冶天工集团有限公司 | Pin shaft pulling-out device |
| CN207273126U (en) * | 2017-07-13 | 2018-04-27 | 陕西陕煤黄陵矿业有限公司 | A kind of specific purpose tool of underground dismounting axis pin |
| CN208552403U (en) * | 2017-12-07 | 2019-03-01 | 同济大学浙江学院 | The disassembly mechanism of wrist joint device for healing and training |
| CN207669228U (en) * | 2017-12-27 | 2018-07-31 | 中国核工业二四建设有限公司 | A kind of tower crane axis pin dismounting special tooling |
| CN108555825A (en) * | 2018-06-20 | 2018-09-21 | 国家电网有限公司 | Pin extracting apparatus |
| CN208729677U (en) * | 2018-08-27 | 2019-04-12 | 中国水利水电第八工程局有限公司 | Pin shaft dismounting device for derrick crane |
| KR102096868B1 (en) * | 2019-03-21 | 2020-04-06 | 이해승 | vertical member |
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|---|---|
| CN112975835B (en) | 2023-04-21 |
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