CN112846673A - Metal piece production device and process - Google Patents
Metal piece production device and process Download PDFInfo
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- CN112846673A CN112846673A CN202110288764.5A CN202110288764A CN112846673A CN 112846673 A CN112846673 A CN 112846673A CN 202110288764 A CN202110288764 A CN 202110288764A CN 112846673 A CN112846673 A CN 112846673A
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention discloses a metal piece production device which comprises a blank forming die and a hole opening mechanism, wherein the blank forming die comprises an upper die and a lower die, the hole opening mechanism comprises a bottom plate and a rectangular block, a movable plate is mounted at the right end of a piston rod of an electric cylinder through a bolt, a motor is mounted in the middle of the right side wall of the movable plate through a bolt, an output connecting rod is mounted at the right end of an output shaft of the motor through a coupler, rectangular through holes are formed in the left side and the right side of the interior of the rectangular block, a round through hole is formed in the bottom of the rectangular block, and the bottom of the rectangular block is; through the metal piece production device and the metal piece production process, the blank piece is made by the blank forming die, and then the blank piece is perforated through the perforating mechanism to make a double-lug hinge finished product, so that the manufacturing process is greatly reduced, the production efficiency of the double-lug hinge finished product is improved, and the quality of the double-lug hinge finished product is greatly improved.
Description
Technical Field
The invention relates to the technical field of metal piece production devices, particularly relates to a metal piece production device, and more particularly provides a metal piece production process.
Background
The production process of a machine refers to the whole process of making a product from raw materials (or semi-finished products). For machine production, the raw material transportation and preservation, production preparation, blank manufacturing, part processing and heat treatment, product assembly and debugging, painting and packaging and the like are included. The content of the production process is very wide, modern enterprises organize production and guide production by using the principle and method of system engineering, and the production process is regarded as a production system with input and output.
In the production process, all the processes of changing the shape, size, position, property, etc. of the production object into a finished product or a semi-finished product are called as a process. It is an integral part of the production process. The processes can be divided into casting, forging, stamping, welding, machining, assembling and other processes, the mechanical manufacturing process generally refers to the sum of the machining process of the parts and the assembling process of the machine, and other processes are called auxiliary processes, such as transportation, storage, power supply, equipment maintenance and the like. The process consists of one or several sequential steps.
When traditional machining device was producing the ears hinge, the operation was complicated, leads to production efficiency low, makes the emergence deformation of ears hinge easily, leads to the quality of preparation to hang down.
Disclosure of Invention
(1) Technical problem to be solved
The invention aims to overcome the defects of the prior art, adapt to practical requirements and provide a metal piece production device and a metal piece production process so as to solve the problems in the background art.
(2) Technical scheme
In order to realize the purpose of the invention, the technical scheme adopted by the invention is as follows:
a metal piece production device comprises a blank forming die and a hole opening mechanism;
the blank forming die comprises an upper die and a lower die, wherein a core is integrally formed in the middle of the bottom of the upper die, a groove is formed in the top of the lower die, the core and the groove form a forming cavity, the forming cavity is the same as a double-lug hinge in shape, a feeding port is formed in a base body of the upper die, the feeding port is communicated with the forming cavity, a blank piece is manufactured through the blank forming die and comprises a U-shaped plate and a round rod;
wherein, the tapping mechanism comprises a bottom plate and a rectangular block, a positioning plate is welded on the left side of the top of the bottom plate, an electric cylinder is installed at the middle part of the right side wall of the positioning plate through a bolt, a movable plate is installed at the right end of a piston rod of the electric cylinder through a bolt, a motor is installed at the middle part of the right side wall of the movable plate through a bolt, an output connecting rod is installed at the right end of an output shaft of the motor through a coupler, a drill rod is installed at the right end of the output connecting rod, two rectangular slots are formed in the right side wall of the output connecting rod at least at equal intervals, a rectangular inserting rod is integrally formed at the left end of the drill rod and inserted into the rectangular slots, the rectangular inserting rod is fixedly connected with the output connecting rod through a screw rod, rectangular through holes are formed in the left side and the right side, the bottom of the rectangular block is welded on the right side of the top of the bottom plate through an inclined support plate;
the punching mechanism further comprises a pressing mechanism, the pressing mechanism comprises a limiting cylinder, the limiting cylinder is welded to the right side of the top of the bottom plate, the outer wall of the top of the limiting cylinder is welded to the inner wall of an inner ring of the wear-resistant bearing, the outer wall of the wear-resistant bearing is welded to a top plate, the top plate is located below the top plate, a pressing plate is sleeved on the outer portion of the limiting cylinder in a movable mode, a telescopic pipe is installed between the pressing plate and the top plate and is arranged in an outer pipe sleeve inner pipe, a spring is arranged inside the telescopic pipe, the upper end and the lower end of the spring are respectively abutted to the bottom of the top plate and the top of the pressing plate, and the pressing plate is located.
Furthermore, the inclined support plates are arranged on the left and right sides, the inclined support plates are welded on the left and right sides of the bottom of the rectangular block, the inclined support plates are arranged in an outward inclined mode, a material receiving groove is formed in the bottom of the rectangular block, and the material receiving groove is located between the left and right inclined support plates.
Furthermore, a riser is arranged on the base body of the upper die and is positioned on the right side of the feeding port; and a horn-shaped charging pipe is arranged at the charging opening.
Furthermore, the outside cover of drilling rod is equipped with spacing bearing, the top and the bottom of the outer loop of spacing bearing all weld there is spacing connecting rod, the left end of spacing connecting rod with the right side wall welding of movable plate.
Furthermore, the top of the rectangular block between the left rectangular through hole and the right rectangular through hole is provided with an arc-shaped bulge.
Furthermore, a limiting round rod is transversely and movably mounted on the base body of the positioning plate, and the right end of the limiting round rod is connected with the left side wall of the moving plate.
Further, spacing round bar equidistance is equipped with four at least, the external screw thread has been seted up to spacing round bar's right-hand member outer wall, the left side wall of movable plate sets up threaded hole, the right-hand member of spacing round bar passes through threaded connection and installs the inside in threaded hole.
Further, the bottom four corners of the moving plate are provided with idler wheels through mounting racks in a rolling mode.
Further, arc-shaped handles are welded in the middle of the outer walls of the front side and the rear side of the material receiving groove.
The invention also provides a metal piece production process, which comprises the following steps:
the method comprises the following steps: adding molten metal into the molding cavity through a feed inlet;
step two: after the molten metal is cooled and formed, taking out the blank, respectively inserting the left side and the right side of a U-shaped plate of the blank into the left rectangular through hole and the right rectangular through hole, and then rotating the top plate and the pressing plate to enable the pressing plate to be pressed above the blank;
step three: starting a motor to drive a drill rod to rotate, simultaneously starting an electric cylinder to drive a moving plate, the motor and the drill rod to move rightwards, enabling the drill rod to penetrate through a circular through hole, enabling the drill rod to penetrate through a blank to punch a hole, and manufacturing the blank into a double-lug hinge finished product;
step four: controlling the electric cylinder to drive the moving plate, the motor and the drill rod to move leftwards, restoring the moving plate, the motor and the drill rod to the original positions, and then taking out the double-lug hinged product;
step five: and taking out the double-lug hinge finished product and grinding.
(3) Has the advantages that:
1. a blank piece is made by a blank forming die, and then the blank piece is perforated by a perforating mechanism to make a double-lug hinge finished product, so that the manufacturing process is greatly reduced, and the production efficiency of the double-lug hinge finished product is improved.
2. When carrying out the trompil with the blank, the inside of two rectangle through-holes about the left and right sides of U-shaped plate inserts respectively has improved the protection to the U-shaped plate, prevents when punching to the U-shaped plate, and the U-shaped plate takes place deformation, has improved the off-the-shelf quality of ears hinge greatly.
3. Through the effect of spacing bearing, improved the stability of drilling rod when rotatory, improved the precision of punching.
4. Through the effect of spacing round bar, reduced the movable plate and removed the rocking of time, improved the precision of punching.
5. When punching the blank, the top plate and the pressing plate are rotated to press the pressing plate above the blank, so that the limit of the blank is improved, and the punching precision is further improved.
6. The drill rod is convenient to disassemble and assemble through the disassembling and assembling screw rod, and the drill rod is convenient to disassemble and assemble and replace.
Drawings
FIG. 1 is a front sectional view of a blank forming die of the metal member production apparatus of the present invention;
FIG. 2 is a schematic structural diagram of a blank member made by the blank forming mold;
FIG. 3 is a schematic structural diagram of a hole opening mechanism of the metal part production device of the present invention;
FIG. 4 is a front sectional view of the hole forming mechanism of the metal member producing apparatus of the present invention;
FIG. 5 is an enlarged view of portion A of FIG. 3;
FIG. 6 is a schematic structural diagram of the hole-opening mechanism of the metal part production device of the present invention when the blank is opened;
fig. 7 is a schematic structural diagram of a double-lug hinge finished product;
FIG. 8 is an enlarged view of portion B of FIG. 4;
FIG. 9 is a schematic structural view of the punching mechanism of the hole-punching mechanism of the metal piece production device of the present invention when the blank piece is not punched;
FIG. 10 is an enlarged view of the portion C of FIG. 4;
fig. 11 is an enlarged view of a portion D in fig. 4.
The reference numbers are as follows:
1. a blank forming die; 11. an upper die; 111. a core type; 112. a feed inlet; 113. a horn-shaped charging pipe; 114. a riser; 12. a lower die; 121. molding a cavity; 21. a U-shaped plate; 22. a round bar; 23. a hole; 3. a base plate; 31. positioning a plate; 311. an electric cylinder; 312. a limiting round rod; 32. moving the plate; 321. a motor; 3211. an output link; 32111. a rectangular slot; 322. a drill stem; 32201. a rectangular insertion rod; 32202. a screw; 3221. a limit bearing; 3222. a limiting connecting rod; 323. a roller; 33. a rectangular block; 331. a rectangular through hole; 332. a circular through hole; 333. an oblique support plate; 334. a material receiving groove; 3341. an arc-shaped handle; 34. a limiting cylinder; 341. a wear-resistant bearing; 342. a top plate; 343. pressing a plate; 344. a limiting plate; 345. a spring; 346. a telescopic tube.
Detailed Description
The invention will be further described with reference to the accompanying figures 1 to 11 and examples:
a metal piece production device comprises a blank forming die 1 and a hole opening mechanism;
as shown in fig. 1, 2, 9, 10 and 11, the blank forming mold 1 includes an upper mold 11 and a lower mold 12, a core 111 is integrally formed in the middle of the bottom of the upper mold 11, a groove is formed in the top of the lower mold 12, the core 111 and the groove form a forming cavity 121, the forming cavity 121 has the same shape as a double-lug hinge, a base of the upper mold 11 is provided with a feed opening 112, the feed opening 112 is communicated with the forming cavity 121, and a blank is formed by the blank forming mold, and includes a U-shaped plate 21 and a round rod 22;
as shown in fig. 3 and 5, the tapping mechanism includes a bottom plate 3 and a rectangular block 33, a positioning plate 31 is welded on the left side of the top of the bottom plate 3, an electric cylinder 311 is installed in the middle of the right side wall of the positioning plate 31 through a bolt, a moving plate 32 is installed at the right end of the piston rod of the electric cylinder 311 through a bolt, a motor 321 is installed in the middle of the right side wall of the moving plate 32 through a bolt, an output link 3211 is installed at the right end of the output shaft of the motor through a coupler, a drill rod 322 is installed at the right end of the output link 3211, two rectangular slots 32111 are formed in the right side wall of the output link 3211 at least at equal intervals, a rectangular insertion rod 32201 is integrally formed at the left end of the drill rod 322, the rectangular insertion rod 32201 is inserted into the rectangular slots 32111, and the rectangular insertion rod 32201 and the output link 3211 are fixedly connected, rectangular through holes 331 are formed in the left side and the right side of the inside of the rectangular block 33, circular through holes 332 are formed in the bottom of the rectangular block 33, and the bottom of the rectangular block 33 is welded to the right side of the top of the bottom plate 3 through a diagonal support plate 333;
the tapping mechanism further comprises a pressing mechanism, the pressing mechanism comprises a limiting cylinder 34, the limiting cylinder 34 is welded on the right side of the top of the bottom plate 3, the outer wall of the top of the limiting cylinder 34 is welded with the inner wall of an inner ring of the wear-resistant bearing 341, a top plate 342 is welded on the outer wall of the wear-resistant bearing 341, a pressing plate 343 is arranged below the top plate 342 and movably sleeved outside the limiting cylinder 34, an extension pipe 346 is installed between the pressing plate 343 and the top plate 342, the extension pipe 346 is arranged in an outer pipe sleeve, a spring 345 is arranged inside the extension pipe 346, the upper end and the lower end of the spring 345 are respectively abutted against the bottom of the top plate 342 and the top of the pressing plate 343, and a limiting plate 344 is welded on the outer wall of the limiting cylinder 34 below the pressing.
In this embodiment, as shown in fig. 3, the two inclined support plates 333 are provided at left and right, the two inclined support plates 333 at left and right are welded at left and right sides of the bottom of the rectangular block 33, the inclined support plates 333 are both inclined outward, a receiving groove 334 is provided at the bottom of the rectangular block 33, and the receiving groove 334 is located between the two inclined support plates 333 at left and right; the fixing effect on the rectangular block 33 is improved by the left and right oblique support plates 333, and waste materials are conveniently received through the material receiving groove 334.
In this embodiment, as shown in fig. 1, a riser 114 is disposed on a base of the upper die 11, and the riser 114 is located on the right side of the feeding port 112; a horn-shaped charging pipe 113 is arranged at the charging opening 112; the riser 114 is convenient for discharging air in the molding cavity 121 from the riser 114 when molten metal is added, and the horn-shaped feeding pipe 113 is convenient for adjusting the molten metal.
In this embodiment, as shown in fig. 3, a limiting bearing 3221 is sleeved outside the drill rod 322, a limiting connecting rod 3222 is welded to both the top and the bottom of an outer ring of the limiting bearing 3221, and a left end of the limiting connecting rod 3222 is welded to the right side wall of the moving plate 32; through the effect of spacing bearing 3221, improved the stability of drilling rod 322 when rotatory, improved the precision of punching.
In this embodiment, as shown in fig. 5, the top of the rectangular block 33 between the left and right rectangular through holes 331 is an arc-shaped protrusion; the fitting degree of the U-shaped plate 21 is improved.
In this embodiment, as shown in fig. 3, a base of the positioning plate 31 is transversely movably mounted with a limiting round rod 312, and a right end of the limiting round rod 312 is connected to a left side wall of the moving plate 32; through the action of the limiting round rod 312, the shaking of the moving plate 32 in the left-right moving process is reduced, and the punching precision is improved.
In this embodiment, as shown in fig. 3, at least four limiting round rods 312 are equidistantly arranged, an external thread is formed on the outer wall of the right end of each limiting round rod 312, a threaded hole is formed in the left side wall of the moving plate 32, and the right end of each limiting round rod 312 is installed inside the threaded hole in a threaded connection manner; the limiting round rod 312 is convenient to disassemble and assemble by twisting the limiting round rod 312.
In this embodiment, as shown in fig. 8, rollers 323 are mounted at four corners of the bottom of the moving plate 32 through mounting brackets in a rolling manner, and the moving plate 32 is convenient to move left and right through the rollers 323.
In this embodiment, as shown in fig. 3, arc-shaped handles 3341 are welded to the middle portions of the outer walls of the front and rear sides of the material receiving groove 334; the receiving trough 334 is conveniently lifted by the arc-shaped handle 3341.
The invention also provides a metal piece production process, which comprises the following steps:
the method comprises the following steps: feeding molten metal into the inside of the molding cavity 121 through the feed opening 112;
step two: after the molten metal is cooled and formed, taking out the blank, inserting the left and right sides of the U-shaped plate 21 of the blank into the left and right rectangular through holes 331 respectively as shown in fig. 2, wherein the state is shown in fig. 9, and then rotating the top plate 342 and the pressing plate 343 to press the pressing plate 343 above the blank, wherein the state is shown in fig. 6;
step three: starting the motor 321 to drive the drill rod 322 to rotate, simultaneously starting the electric cylinder 311 to drive the moving plate 32, the motor 321 and the drill rod 322 to move rightwards, enabling the drill rod 322 to penetrate through the circular through hole 332, enabling the drill rod 322 to penetrate through the blank to punch the hole 23, and making the blank into a double-lug hinge finished product, as shown in fig. 7;
step four: controlling the electric cylinder 311 to drive the moving plate 32, the motor 321 and the drill rod 322 to move leftwards, so that the moving plate 32, the motor 321 and the drill rod 322 are restored to the original positions, and then taking out the double-lug hinge finished product;
step five: and taking out the double-lug hinge finished product and grinding.
The invention has the beneficial effects that:
according to the invention, the blank forming die 1 is used for manufacturing the blank, and then the blank is perforated through the perforating mechanism to manufacture the double-lug hinge finished product, so that the manufacturing process is greatly reduced, and the production efficiency of the double-lug hinge finished product is improved.
In the invention, when the blank is perforated, the left side and the right side of the U-shaped plate 21 are respectively inserted into the left rectangular through hole 331 and the right rectangular through hole 331, so that the protection of the U-shaped plate 21 is improved, the U-shaped plate 21 is prevented from deforming when the U-shaped plate 21 is perforated, and the quality of a double-lug hinge finished product is greatly improved.
In the invention, the stability of the drill rod 322 in rotation is improved and the punching precision is improved by the action of the limiting bearing 3221.
In the invention, the swinging of the moving plate 32 in the left-right movement process is reduced by the action of the limiting round rod 312, and the punching precision is improved.
In the invention, when the blank is punched, the top plate 342 and the pressing plate 343 are rotated, so that the pressing plate 343 is pressed above the blank, the limit of the blank is improved, and the punching precision is further improved.
In the invention, the drill rod 322 is convenient to disassemble and assemble by disassembling and assembling the screw rod 32202, and the drill rod 322 is convenient to disassemble and assemble and replace.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (10)
1. The metal piece production device is characterized in that: comprises a blank forming die (1) and a hole opening mechanism;
the blank forming die (1) comprises an upper die (11) and a lower die (12), a core type (111) is integrally formed in the middle of the bottom of the upper die (11), a groove is formed in the top of the lower die (12), a forming cavity (121) is formed by the core type (111) and the groove, the shape of the forming cavity (121) is the same as that of a double-lug hinge, a feeding hole (112) is formed in a base body of the upper die (11), the feeding hole (112) is communicated with the forming cavity (121), a blank piece is manufactured through the blank forming die (1), and the blank piece comprises a U-shaped plate (21) and a round rod (22);
wherein, the tapping mechanism comprises a bottom plate (3) and a rectangular block (33), a positioning plate (31) is welded on the left side of the top of the bottom plate (3), an electric cylinder (311) is installed in the middle of the right side wall of the positioning plate (31) through a bolt, a moving plate (32) is installed at the right end of a piston rod of the electric cylinder (311) through a bolt, a motor (321) is installed in the middle of the right side wall of the moving plate (32) through a bolt, an output connecting rod (3211) is installed at the right end of an output shaft of the motor (321) through a coupling, a drill rod (322) is installed at the right end of the output connecting rod (3211), two rectangular slots (32111) are formed in the right side wall of the output connecting rod (3211) at least at equal intervals, a rectangular inserting rod (32201) is integrally formed at the left end of the drill rod (322), and the rectangular inserting rod (, the rectangular insertion rod (32201) is fixedly connected with the output connecting rod (3211) through a screw (32202), rectangular through holes (331) are formed in the left side and the right side of the inside of the rectangular block (33), a round through hole (332) is formed in the bottom of the rectangular block (33), and the bottom of the rectangular block (33) is welded to the right side of the top of the bottom plate (3) through an inclined support plate (333);
wherein the hole opening mechanism also comprises a pressing mechanism, the pressing mechanism comprises a limiting cylinder (34), the limiting cylinder (34) is welded on the right side of the top of the bottom plate (3), the outer wall of the top of the limiting cylinder (34) is welded with the inner wall of the inner ring of the wear-resistant bearing (341), a top plate (342) is welded on the outer wall of the wear-resistant bearing (341), a pressure plate (343) is movably sleeved outside the limiting cylinder (34) below the top plate (342), an extension pipe (346) is arranged between the pressing plate (343) and the top plate (342), the telescopic pipe (346) is arranged for sleeving an inner pipe outside the pipe, a spring (345) is arranged inside the telescopic pipe (346), the upper end and the lower end of the spring (345) are respectively abutted to the bottom of the top plate (342) and the top of the pressing plate (343), and a limiting plate (344) is welded on the outer wall of the limiting cylinder (34) and located below the pressing plate (343).
2. The metal part production apparatus of claim 1, wherein: the inclined support plate (333) is provided with a left inclined support plate and a right inclined support plate, the left inclined support plate and the right inclined support plate (333) are welded on the left side and the right side of the bottom of the rectangular block (33), the inclined support plate (333) is arranged in an outward inclined mode, the bottom of the rectangular block (33) is provided with a material receiving groove (334), and the material receiving groove (334) is located between the left inclined support plate and the right inclined support plate (333).
3. The metal part production apparatus according to claim 2, wherein: a riser (114) is arranged on the base body of the upper die (11), and the riser (114) is positioned on the right side of the feed inlet (112); and a horn-shaped feeding pipe (113) is arranged on the feeding opening (112).
4. The metal part production apparatus of claim 1, wherein: the drill rod (322) is sleeved with a limiting bearing (3221), the top and the bottom of an outer ring of the limiting bearing (3221) are respectively welded with a limiting connecting rod (3222), and the left end of the limiting connecting rod (3222) is welded with the right side wall of the moving plate (32).
5. The metal part production apparatus of claim 1, wherein: the top of the rectangular block (33) between the left rectangular through hole and the right rectangular through hole (331) is provided with an arc-shaped bulge.
6. The metal part production apparatus of claim 1, wherein: the positioning plate is characterized in that a limiting round rod (312) is transversely and movably mounted on the base body of the positioning plate (31), and the right end of the limiting round rod (312) is connected with the left side wall of the moving plate (32).
7. The metal piece production apparatus according to claim 6, wherein: spacing round bar (312) equidistance at least is equipped with four, the external screw thread has been seted up to the right-hand member outer wall of spacing round bar (312), the left side wall of movable plate (32) sets up threaded hole, the right-hand member of spacing round bar (312) is installed through threaded connection the inside of screw hole.
8. The metal part production apparatus of claim 1, wherein: and four corners of the bottom of the moving plate (32) are provided with idler wheels (323) through mounting racks in a rolling manner.
9. The metal part production apparatus according to claim 2, wherein: arc-shaped handles (3341) are welded in the middle of the outer walls of the front side and the rear side of the material receiving groove (334).
10. A metal piece production process is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: adding molten metal into the molding cavity (121) through a feeding port (112);
step two: after the molten metal is cooled and formed, taking out the blank, respectively inserting the left side and the right side of a U-shaped plate (21) of the blank into the left rectangular through hole and the right rectangular through hole (331), and then rotating the top plate (342) and the pressing plate (343) to press the pressing plate (343) above the blank;
step three: starting a motor (321) to drive a drill rod (322) to rotate, simultaneously starting an electric cylinder (311) to drive a moving plate (32), the motor (321) and the drill rod (322) to move rightwards, enabling the drill rod (322) to penetrate through a circular through hole (332), enabling the drill rod (322) to penetrate through a blank to punch a hole (23), and making the blank into a double-lug hinge finished product;
step four: controlling the electric cylinder (311) to drive the moving plate (32), the motor (321) and the drill rod (322) to move leftwards, so that the moving plate (32), the motor (321) and the drill rod (322) restore to the original positions, and then taking out the double-lug hinged product;
step five: and taking out the double-lug hinge finished product and grinding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110288764.5A CN112846673B (en) | 2021-03-18 | 2021-03-18 | Metal piece production device and process |
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|---|---|---|---|
| CN202110288764.5A CN112846673B (en) | 2021-03-18 | 2021-03-18 | Metal piece production device and process |
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| CN112846673A true CN112846673A (en) | 2021-05-28 |
| CN112846673B CN112846673B (en) | 2023-05-23 |
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