CN112719994B - Fixed clamping tool for cutting mechanical raw materials - Google Patents
Fixed clamping tool for cutting mechanical raw materials Download PDFInfo
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- CN112719994B CN112719994B CN202110185954.4A CN202110185954A CN112719994B CN 112719994 B CN112719994 B CN 112719994B CN 202110185954 A CN202110185954 A CN 202110185954A CN 112719994 B CN112719994 B CN 112719994B
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- sliding
- base
- block
- fixedly provided
- clamping
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0042—Devices for removing chips
- B23Q11/005—Devices for removing chips by blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
- B23Q3/064—Work-clamping means adapted for holding workpieces having a special form or being made from a special material for holding elongated workpieces, e.g. pipes, bars or profiles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sawing (AREA)
Abstract
The invention discloses a fixed clamping tool for cutting mechanical raw materials, relates to the technical field of machining, and solves the problems that errors are easy to occur in the process of cutting the mechanical raw materials, the improvement of production efficiency is not facilitated, and the workload of workers is increased due to a large amount of scraps generated in the cutting process. A fixed clamping tool for cutting mechanical raw materials comprises a base; the top of the first sliding rod is provided with a sliding block in a sliding manner; the inner side of the fixed disc is fixedly provided with a sliding seat in an annular array shape; the top of the base is fixedly provided with a mounting frame through bolts; the top of the mounting rack is fixedly provided with a fixing plate through bolts; by arranging the base, the sliding block and the sliding seat, the stability of raw materials in the cutting process and the accuracy of finished products can be further enhanced, and the production efficiency is improved; through being provided with mounting bracket and fixed plate, can clear up the top of base at the in-process of cutting, alleviate staff's work burden.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a fixed clamping tool for cutting mechanical raw materials.
Background
In the machining process, an iron block or an iron rod is often required to be cut, and the fixed clamping tool used in the cutting process of the mechanical raw materials is required because the mechanical raw materials can be influenced by external force to generate displacement in the cutting process.
Through retrieval, for example, patent No. CN108723833A discloses a fixing tool, which comprises a front clamping part and a rear clamping part and a plurality of fixing devices, wherein the two clamping parts are symmetrical to each other, the clamping parts comprise a base and a clamping block, the base is a cuboid, two sides of the base are provided with square connecting blocks, a through hole is arranged in the middle of each connecting block, the clamping block is arranged above the base, the clamping block has the same length as the base, the rear side surface of the clamping block is flush with the rear side surface of the base, the clamping block and the base are integrally formed, the front side surface of the clamping block is provided with a plurality of reinforcing ribs connected with the upper surface of the base, the rear side surface of the clamping block is provided with a plurality of semicircular grooves, the semicircular grooves are deep to the upper surface of the base, each fixing device comprises a vertical rod, a horizontal rod, a connecting shaft, a bolt and a spring, the vertical downward fixed folding angle is arranged at one end of the vertical rod, the spring is positioned inside the vertical rod, one end of the spring is connected with the horizontal rod, the bolt fixes the position of the spring. The invention can clamp a plurality of cylindrical blanks at one time, saves the clamping time and improves the processing efficiency.
However, the existing fixed clamping tool for the mechanical raw materials is mainly used for simply fixing the mechanical raw materials through the pressing plate, in the cutting process, especially, the cylindrical mechanical materials are easy to rotate and displace, so that errors are easy to occur in the cutting of the mechanical raw materials, the rework rate and the rejection rate are increased, the improvement of the production efficiency is not facilitated, a large amount of scraps generated in the cutting process of the mechanical raw materials can also influence the production accuracy of products, the workload of workers is increased, therefore, the existing requirement is not met, and the fixed clamping tool for the cutting of the mechanical raw materials is provided.
Disclosure of Invention
Problem (A)
The invention aims to provide a fixed clamping tool for cutting mechanical raw materials, and aims to solve the problems that the existing fixed clamping tool for the mechanical raw materials in the background art is used for simply fixing the mechanical raw materials through a pressing plate, and particularly, cylindrical mechanical materials are easy to rotate and displace in the cutting process, so that errors are easily caused in the cutting of the mechanical raw materials, the rework rate and the rejection rate are increased, the improvement of the production efficiency is not facilitated, and the production accuracy of products is also influenced and the workload of workers is increased due to a large amount of scraps generated in the cutting process of the mechanical raw materials.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a fixed clamping tool for cutting mechanical raw materials comprises a base; the base further comprises a first sliding rod; the bottom of the base is fixedly provided with a first sliding rod through a bolt; the top of the first sliding rod is provided with a sliding block in a sliding manner, and the bottom of the sliding block is provided with a screw hole; the sliding block also comprises a fixed disc; the front side of the sliding block is fixedly provided with a fixed disc through a bolt, and the middle of the inner side of the fixed disc is provided with a slotted hole; the inner side of the fixed disc is fixedly provided with a sliding seat in an annular array shape; the top of the base is fixedly provided with a mounting frame through bolts; the top of the mounting rack is fixedly provided with a fixing plate through bolts.
Furthermore, the base also comprises a bidirectional screw, a scissor mechanism and a control screw; the bottom of the base is rotatably provided with a bidirectional screw rod through hinge connection, and the bidirectional screw rod penetrates through a screw hole in the bottom of the sliding block; the top of the base is fixedly provided with a scissor mechanism through bolts, and the front side of the scissor mechanism is provided with a screw hole; the front side of the scissors mechanism is rotationally provided with a control screw.
Furthermore, the sliding block also comprises a second sliding rod and a baffle; a second sliding rod is arranged in the groove hole in the inner side of the fixed disc in a sliding manner, and a groove is formed in the outer side of the second sliding rod; the outside of sliding block is provided with the baffle through welded fastening, and is provided with spring coupling between baffle and the second slide bar fixedly.
Furthermore, the sliding seat also comprises a roller, a clamping block and a steel wire rope; the inner side of the sliding seat is rotatably provided with a roller through hinge connection, and the outer side of the roller is provided with a groove; the top of the sliding seat is provided with a clamping block in a sliding manner, and the inner side of the clamping block is provided with an anti-skidding groove; the bottom of the clamping block is fixedly connected with a steel wire rope, and the steel wire rope bypasses the roller wheel and is fixedly connected with the outer side of the second sliding rod.
Furthermore, the mounting rack also comprises a third sliding rod, a sliding plate and a connecting block; two groups of third sliding rods are fixedly arranged on the inner side of the mounting rack through bolts; a sliding plate is arranged between the two groups of third sliding rods in a sliding manner, and a sliding rail is arranged on the inner side of the sliding plate; the inboard slip of slide is provided with the connecting block, and the opening has been seted up to the bottom of connecting block.
Furthermore, the fixing plate also comprises a chain wheel and a chain; the bottom of the fixed plate is rotatably provided with a chain wheel through a hinge; the outside cover of sprocket is equipped with the chain, and the bottom of chain is through pivot and connecting block swivelling joint.
Furthermore, the fixed plate also comprises a motor and a blower; the top of the fixed plate is fixedly provided with a motor through a bolt, and the motor is in transmission connection with the chain wheel; the top of the fixed plate is fixedly provided with an air blower through a bolt, and the air blower is communicated with an opening at the bottom of the connecting block through a hose.
(III) advantageous effects
The invention provides a fixed clamping tool for cutting mechanical raw materials, which is provided with a base, sliding blocks and a sliding seat, wherein the raw materials are placed at the top of a scissor fork mechanism, then a bidirectional screw rod is rotated to drive two groups of sliding blocks to slide inwards, so that two ends of the raw materials are in contact with the inner sides of second sliding blocks, and the second sliding blocks are pushed to slide outwards along the tops of the sliding blocks, so that a clamping block is driven by a steel wire rope to slide inwards along the sliding seat, the outer side surfaces of the raw materials are clamped by the clamping block, the two ends of the raw materials are clamped by the second sliding blocks and the inner sides of a fixed disc, and the raw materials can be clamped from two ends and the periphery of the raw materials, the stability of the raw materials in the cutting process and the accuracy of finished products are further enhanced, and the production efficiency is improved.
Through being provided with mounting bracket and fixed plate, through opening air-blower and motor, it is rotatory to drive sprocket and chain through the motor, it slides around the inboard of slide to drive the connecting block through the chain, it slides around along third slide bar horizontal slip to drive the slide simultaneously, thereby the blowing pipe that drives the air-blower through the connecting block carries out the strong wind clearance to the top of base, blow away the sweeps, can in time clear up the top of base at the in-process of cutting, the sweeps of avoiding producing brings the influence to production, thereby the error factor that appears in the reduction cutting process that can step forward, can alleviate staff's work burden simultaneously.
Drawings
FIG. 1 is a schematic perspective view of an axial side of an embodiment of the present invention;
FIG. 2 is a schematic top view of an embodiment of the present invention;
FIG. 3 is a schematic bottom view of an embodiment of the present invention;
FIG. 4 is a schematic side view of an embodiment of the present invention;
FIG. 5 is a schematic bottom view of a mounting bracket according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a slider structure according to an embodiment of the present invention;
in fig. 1 to 6, the correspondence between the part names or lines and the reference numbers is:
1. a base; 101. a first slide bar; 102. a bidirectional screw; 103. a scissor mechanism; 104. controlling the screw; 2. a slider; 201. fixing the disc; 202. a second slide bar; 203. a baffle plate; 3. a slide base; 301. a roller; 302. a clamping block; 303. a wire rope; 4. a mounting frame; 401. a third slide bar; 402. a slide plate; 403. connecting blocks; 5. a fixing plate; 501. a sprocket; 502. a chain; 503. a motor; 504. a blower.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1 to 6, an embodiment of the present invention includes: a fixed clamping tool for cutting mechanical raw materials comprises a base 1; the base 1 further comprises a first slide bar 101; the bottom of the base 1 is fixedly provided with a first sliding rod 101 through a bolt; the top of the first sliding rod 101 is provided with a sliding block 2 in a sliding manner, and the bottom of the sliding block 2 is provided with a screw hole; the sliding block 2 further comprises a fixed disc 201; the front side of the sliding block 2 is fixedly provided with a fixed disc 201 through bolts, and the middle of the inner side of the fixed disc 201 is provided with a slotted hole; the inner side of the fixed disc 201 is fixedly provided with a sliding seat 3 in an annular array shape; the sliding seat 3 further comprises a roller 301, a clamping block 302 and a steel wire rope 303; the inner side of the sliding seat 3 is rotatably provided with a roller 301 through a hinge, and the outer side of the roller 301 is provided with a groove; a clamping block 302 is arranged at the top of the sliding seat 3 in a sliding manner, and an anti-slip groove is formed in the inner side of the clamping block 302; the bottom of the clamping block 302 is fixedly connected with a steel wire rope 303, and the steel wire rope 303 bypasses the roller 301 and is fixedly connected with the outer side of the second sliding rod 202; the top of the base 1 is fixedly provided with a mounting frame 4 through bolts; the mounting rack 4 further comprises a third sliding rod 401, a sliding plate 402 and a connecting block 403; two groups of third sliding rods 401 are fixedly arranged on the inner side of the mounting frame 4 through bolts; a sliding plate 402 is arranged between the two groups of third sliding rods 401 in a sliding manner, and a sliding rail is arranged on the inner side of the sliding plate 402; a connecting block 403 is arranged on the inner side of the sliding plate 402 in a sliding manner, and an opening is formed in the bottom of the connecting block 403; the top of the mounting frame 4 is fixedly provided with a fixing plate 5 through bolts; wherein, the fixing plate 5 further comprises a chain wheel 501 and a chain 502; the bottom of the fixed plate 5 is rotatably provided with a chain wheel 501 through hinge connection; the chain 502 is sleeved outside the chain wheel 501, and the bottom of the chain 502 is rotatably connected with the connecting block 403 through a rotating shaft.
Wherein, the base 1 also comprises a bidirectional screw 102, a scissor mechanism 103 and a control screw 104; the bottom of the base 1 is rotatably provided with a bidirectional screw 102 through hinge connection, and the bidirectional screw 102 penetrates through a screw hole at the bottom of the sliding block 2; the top of the base 1 is fixedly provided with a scissor mechanism 103 through bolts, and the front side of the scissor mechanism 103 is provided with a screw hole; the front side of the scissors mechanism 103 is rotatably provided with a control screw 104; the lifting movement of the scissors mechanism 103 is controlled by rotating the control screw 104.
The sliding block 2 further comprises a second sliding rod 202 and a baffle 203; a second sliding rod 202 is arranged in a groove hole in the inner side of the fixed disc 201 in a sliding manner, and a groove is formed in the outer side of the second sliding rod 202; the outer side of the sliding block 2 is fixedly provided with a baffle 203 by welding, and a spring connection is fixedly arranged between the baffle 203 and the second sliding rod 202.
Wherein, the fixing plate 5 further comprises a motor 503 and a blower 504; the top of the fixed plate 5 is fixedly provided with a motor 503 through a bolt, and the motor 503 is in transmission connection with a chain wheel 501; the top of the fixing plate 5 is fixedly provided with an air blower 504 through a bolt, and the air blower 504 is communicated with an opening at the bottom of the connecting block 403 through a hose; the chain wheel 501 and the chain 502 are driven by the motor 503 to rotate, and the air blower 504 is connected with a pipeline to blow and clean the scraps on the top of the base 1 from the bottom of the connecting block 403.
The working principle is as follows: placing a mechanical raw material to be cut on the top of a shearing fork mechanism 103, then lifting the shearing fork mechanism 103 through a rotary control screw 104 to enable two ends of the raw material to be respectively aligned with the inner sides of second sliding rods 202, then rotating a bidirectional screw 102 to drive two groups of sliding blocks 2 to slide inwards, enabling two ends of the raw material to be in contact with the inner sides of the second sliding rods 202, and pushing the second sliding rods 202 to slide outwards along the tops of the sliding blocks 2, so that clamping blocks 302 are driven by steel wire ropes 303 to slide inwards along sliding seats 3, clamping the outer side surfaces of the raw material through the clamping blocks 302, and clamping two ends of the raw material through the inner sides of the second sliding rods 202 and fixed disks 201, thereby completing the fixed clamping of the raw material; in the cutting process, the blower 504 and the motor 503 are turned on, the motor 503 drives the chain wheel 501 and the chain 502 to rotate, the chain 502 drives the connecting block 403 to slide back and forth along the inner side of the sliding plate 402, and simultaneously the sliding plate 402 is driven to slide left and right along the third sliding rod 401, so that the blowing pipeline which drives the blower 504 through the connecting block 403 carries out strong wind cleaning on the top of the base 1, and scraps are blown away.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (1)
1. The utility model provides a machinery raw and other materials cutting is with fixed centre gripping frock which characterized in that: comprises a base (1); the base (1) further comprises a first sliding rod (101); the bottom of the base (1) is fixedly provided with a first sliding rod (101) through a bolt; the top of the first sliding rod (101) is provided with a sliding block (2) in a sliding manner, and the bottom of the sliding block (2) is provided with a screw hole; the sliding block (2) further comprises a fixed disc (201); the front side of the sliding block (2) is fixedly provided with a fixed disc (201) through a bolt, and the middle of the inner side of the fixed disc (201) is provided with a slotted hole; the inner side of the fixed disc (201) is fixedly provided with a sliding seat (3) in an annular array; the top of the base (1) is fixedly provided with a mounting rack (4) through bolts; the top of the mounting rack (4) is fixedly provided with a fixing plate (5) through a bolt;
the base (1) also comprises a bidirectional screw (102), a scissor mechanism (103) and a control screw (104); the bottom of the base (1) is rotatably provided with a bidirectional screw (102) through hinge connection, and the bidirectional screw (102) penetrates through a screw hole in the bottom of the sliding block (2); the top of the base (1) is fixedly provided with a scissor mechanism (103) through bolts, and the front side of the scissor mechanism (103) is provided with a screw hole; a control screw (104) is rotationally arranged at the front side of the scissor mechanism (103);
the sliding block (2) further comprises a second sliding rod (202) and a baffle (203); a second sliding rod (202) is arranged in a groove hole in the inner side of the fixed disc (201) in a sliding manner, and a groove is formed in the outer side of the second sliding rod (202); the outer side of the sliding block (2) is fixedly provided with a baffle (203) through welding, and a spring connection is fixedly arranged between the baffle (203) and the second sliding rod (202);
the sliding seat (3) also comprises a roller (301), a clamping block (302) and a steel wire rope (303); the inner side of the sliding seat (3) is rotatably provided with a roller (301) through hinge connection, and the outer side of the roller (301) is provided with a groove; the top of the sliding seat (3) is provided with a clamping block (302) in a sliding manner, and the inner side of the clamping block (302) is provided with an anti-skidding groove; the bottom of the clamping block (302) is fixedly connected with a steel wire rope (303), and the steel wire rope (303) bypasses the roller (301) and is fixedly connected with the outer side of the second sliding rod (202);
the mounting frame (4) further comprises a third sliding rod (401), a sliding plate (402) and a connecting block (403); two groups of third sliding rods (401) are fixedly arranged on the inner side of the mounting frame (4) through bolts; a sliding plate (402) is arranged between the two groups of third sliding rods (401) in a sliding manner, and a sliding rail is arranged on the inner side of the sliding plate (402); a connecting block (403) is arranged on the inner side of the sliding plate (402) in a sliding manner, and an opening is formed in the bottom of the connecting block (403);
the fixing plate (5) further comprises a chain wheel (501) and a chain (502); the bottom of the fixed plate (5) is rotatably provided with a chain wheel (501) through a hinge joint; a chain (502) is sleeved on the outer side of the chain wheel (501), and the bottom of the chain (502) is rotatably connected with the connecting block (403) through a rotating shaft;
the fixed plate (5) also comprises a motor (503) and a blower (504); the top of the fixed plate (5) is fixedly provided with a motor (503) through a bolt, and the motor (503) is in transmission connection with a chain wheel (501); the top of the fixing plate (5) is fixedly provided with an air blower (504) through a bolt, and the air blower (504) is communicated with an opening at the bottom of the connecting block (403) through a hose;
the method comprises the steps of placing a mechanical raw material to be cut on the top of a shearing fork mechanism (103), lifting the shearing fork mechanism (103) through a rotary control screw (104), enabling two ends of the raw material to be respectively aligned with the inner sides of second sliding rods (202), then rotating a bidirectional screw (102) to drive two groups of sliding blocks (2) to slide inwards, enabling two ends of the raw material to be in contact with the inner sides of the second sliding rods (202), pushing the second sliding rods (202) to slide outwards along the tops of the sliding blocks (2), driving clamping blocks (302) to slide inwards along a sliding seat (3) through steel wire ropes (303), clamping the outer side faces of the raw material through the clamping blocks (302), and clamping the two ends of the raw material through the inner sides of the second sliding rods (202) and a fixed disc (201), thereby completing the fixed clamping of the raw materials;
in the cutting process, an air blower (504) and a motor (503) are opened, a chain wheel (501) and a chain (502) are driven to rotate through the motor (503), a connecting block (403) is driven to slide back and forth along the inner side of a sliding plate (402) through the chain (502), and the sliding plate (402) is driven to slide left and right along a third sliding rod (401) simultaneously, so that a blowing pipeline driving the air blower (504) through the connecting block (403) carries out strong wind cleaning on the top of a base (1), and sweeps are blown away.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110185954.4A CN112719994B (en) | 2021-02-13 | 2021-02-13 | Fixed clamping tool for cutting mechanical raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110185954.4A CN112719994B (en) | 2021-02-13 | 2021-02-13 | Fixed clamping tool for cutting mechanical raw materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112719994A CN112719994A (en) | 2021-04-30 |
| CN112719994B true CN112719994B (en) | 2022-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110185954.4A Active CN112719994B (en) | 2021-02-13 | 2021-02-13 | Fixed clamping tool for cutting mechanical raw materials |
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| Country | Link |
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| CN (1) | CN112719994B (en) |
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| CN102556892B (en) * | 2012-02-20 | 2014-04-09 | 上海大学 | Electric shear type lifting platform |
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| CN108723833A (en) * | 2018-07-25 | 2018-11-02 | 如皋市凌云环境工程有限公司 | A kind of fixing tool |
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|---|---|---|---|---|
| CN207606360U (en) * | 2017-11-09 | 2018-07-13 | 罗群杰 | A kind of mechanical processing cutter device |
| CN211305053U (en) * | 2019-12-12 | 2020-08-21 | 山东北易车业有限公司 | Numerical control metal cutting machine tool |
| CN111421164A (en) * | 2020-05-20 | 2020-07-17 | 湖北偌泰金莱机械制造有限公司 | Main bearing cap mills open slot frock |
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| Publication number | Publication date |
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| CN112719994A (en) | 2021-04-30 |
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