CN113146023B - Laser modeling tool for connecting rod oil groove - Google Patents
Laser modeling tool for connecting rod oil groove Download PDFInfo
- Publication number
- CN113146023B CN113146023B CN202110530670.4A CN202110530670A CN113146023B CN 113146023 B CN113146023 B CN 113146023B CN 202110530670 A CN202110530670 A CN 202110530670A CN 113146023 B CN113146023 B CN 113146023B
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- connecting rod
- rod
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- oil groove
- tool
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- 238000007599 discharging Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 238000003754 machining Methods 0.000 description 7
- 238000003801 milling Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/16—Removal of by-products, e.g. particles or vapours produced during treatment of a workpiece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
Abstract
The invention discloses a tool for laser modeling of a connecting rod oil groove. Install the pin on the T template, cup jointed reset spring on the pin, the pin passes the baffle, extrudees reset spring when T template antedisplacement. The two sliding tables are similar in shape and arranged in a mirror image mode, are symmetrically arranged by taking the T-shaped plate as a center and are respectively hinged with the T-shaped rod through a connecting rod, and a transverse linear bearing is arranged at the bottom of the front end of each sliding table and is matched with the guide rail; the extension part at the rear end of the sliding table drives the clamping block to move. The arc-shaped bulge on the clamping block can be in line contact with the inner wall of the big end of the connecting rod and avoids an oil groove to be processed. The upper seat plate is provided with a small head of a self-centering clamping plate clamping connecting rod. The connecting rod positioning device is suitable for connecting rods with different specifications, the tool is flexibly connected with the connecting rods, the positioning precision is high, the connecting rods can be driven to be automatically processed, and the working efficiency is high.
Description
Technical Field
The invention belongs to the field of connecting rod machining tool fixtures, and particularly relates to a tool for laser modeling of a connecting rod oil groove.
Background
The connecting rod is connected with a piston and a crankshaft, transmits acting force applied to the piston to the crankshaft, and converts reciprocating motion of the piston into rotary motion of the crankshaft. The connecting rod body consists of three parts, and the part connected with the piston pin is called a connecting rod small end; the part connected with the crankshaft is called a connecting rod big head, and the rod part connected with the small head and the big head is called a connecting rod body. The big end of the connecting rod is mostly of a thin-wall annular structure, and an oil groove is processed in the big end hole for reducing abrasion between the connecting rod and the crankshaft, so that splashed oil foam enters the oil groove to lubricate the matching surface of the big end hole and the crankshaft.
The connecting rod oil groove is machined by a milling machine at present, for example, the Chinese patent with the publication number of CN208961543U discloses a machine tool for machining the connecting rod oil groove, wherein a pressing plate is adopted to clamp and connect the big end of the connecting rod, so that the problems that the connecting rod is easy to shake in the machining process in the milling machining process because the connecting rod is only clamped on the machine tool, and the machining precision is insufficient or the machining fails are solved.
This company adopts laser to process the connecting rod oil groove, and work efficiency is high, avoids the contact to mill the influence of rocking to the connecting rod work piece in the course of working. As shown in the attached figure 1 of the specification, in order to position the connecting rod, the laser processing tool for the connecting rod oil groove is designed, the large end of the connecting rod is sleeved on the base, the small end of the connecting rod is placed in the U-shaped limiting groove and can be matched with a laser generator, a feeding mechanism and the like, and the automatic operation of laser modeling is realized. In practical use, the following problems are encountered:
1. the mandrel on the base, which is sleeved with the big end of the connecting rod, needs to be adjusted according to the connecting rods with different specifications, and when the connecting rods with different diameters are processed, the base needs to be adjusted, so that the base is troublesome to disassemble and assemble;
2. because the U-shaped groove and the base are rigid, gaps need to be formed between the small end of the connecting rod and the U-shaped groove and between the large end of the connecting rod and the mandrel of the base, otherwise the connecting rod is easily damaged and has gaps which influence the positioning precision of the connecting rod, and particularly the small end of the connecting rod is easy to shake;
3. in the laser processing process, dust falling from the inside of the big end of the connecting rod cannot be effectively cleaned.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a tool for laser modeling of an oil groove of a connecting rod, which can flexibly clamp a large head and a small head of the connecting rod, ensures positioning accuracy and is suitable for connecting rods with different specifications.
In order to achieve the aim, the invention provides a tool for laser modeling of a connecting rod oil groove, which is arranged on rotary tables, each rotary table at least comprises a feeding and discharging station and a processing station, a servo motor drives the rotary tables to rotate through a speed reducing mechanism,
the upper part of the processing station is provided with a laser modeling instrument, and the lower part of the processing station is provided with a dust recovery pipe; a pushing cylinder is arranged at the feeding and discharging station and can drive a connecting block of the tool assembly to move back and forth,
the frock subassembly includes:
a connecting block which is connected with the T-shaped plate and drives the T-shaped plate to move back and forth,
a thin rod is arranged on the T-shaped plate, a return spring is sleeved on the thin rod, the thin rod penetrates through the baffle plate, the return spring is extruded when the T-shaped plate moves forwards,
the two sliding tables are similar in shape and arranged in a mirror image mode, are symmetrically arranged by taking the T-shaped plate as a center and are respectively hinged with the T-shaped rod through a connecting rod, and a transverse linear bearing is arranged at the bottom of the front end of each sliding table and is matched with the guide rail; the extension part at the rear end of the sliding table drives the clamping block to move,
two clamping blocks are symmetrically arranged and are respectively detachably connected with the extending part of the sliding table, the clamping blocks are provided with a plurality of vertical rods which are vertically and symmetrically arranged, the vertical rods are provided with arc-shaped bulges, the arc-shaped bulges can be in line contact with the inner wall of the big end of the connecting rod and avoid an oil groove to be processed,
the connecting rod is placed on the upper seat plate, and the upper seat plate is provided with enough notches for the vertical rods of the clamping blocks to extend out;
two self-centering splints are symmetrically arranged and are arranged on the upper seat plate, each self-centering splint is provided with a telescopic elastic rod, a spring is arranged in each elastic rod, the front end of each elastic rod is spherical, the small end of each connecting rod is embedded between the two elastic rods,
the bottom plate, install guide rail, dog on the bottom plate, and install the backing plate, the backing plate is located between bedplate and the bottom plate, places the extension of slip table on the backing plate, and leads the extension through the step, all be provided with the chip removal hole that link up on backing plate and the base, the chip removal hole is located connecting rod major part center below.
Further, the connecting block includes the vertical stock of extension, the vertical quarter butt of being connected with the T template to and the horizontal pole of connecting stock, quarter butt, vertical stock can be promoted by the telescopic link of pushing cylinder.
Furthermore, the bottom of the T-shaped plate is provided with a longitudinal linear bearing, and the longitudinal linear bearing is matched with a guide rail which is arranged on the bottom plate in a longitudinal mode.
Furthermore, a proximity switch is installed on the side surface of the pushing cylinder, and the retraction and extension states of the pushing cylinder are detected.
Further, the lower part of the baffle is provided with a notch for accommodating a guide rail or a movable T-shaped plate.
Furthermore, the extension part of the sliding table is provided with two rectangular grooves, the protruding part at the bottom of the clamping block is embedded into the rectangular grooves, and the clamping block is locked at the rectangular grooves through bolts.
Further, the backing plate is provided with the stopper between the extension of two slip tables, avoid too closely damaging through the stopper when the extension is close to the fixture block.
The invention has the beneficial effects that:
1. the tool for laser modeling of the oil groove of the connecting rod is matched with the rotary table, the two laser modeling instruments and the pushing cylinder to automatically perform laser modeling on the connecting rod, the working efficiency is higher, the tool is contacted and fixed with a large head and a small head of the connecting rod in a flexible and self-centering mode, and the inner surface of the large head is prevented from being damaged while the positioning accuracy of the connecting rod is ensured;
2. the chip removal hole is formed in the big end of the connecting rod, and dust formed by laser modeling can be collected through negative pressure;
3. the tool is suitable for connecting rods with different diameters and various specifications, and is prevented from being disassembled and assembled.
Drawings
FIG. 1 is a schematic perspective view of a prior art tooling for laser modeling of connecting rod oil grooves in the background of the present invention;
FIG. 2 is a schematic front view of the assembly of the tool for laser modeling of the oil groove of the connecting rod, a turntable and a laser processing device;
FIG. 3 is a perspective view of the assembly of the laser modeling tool for the connecting rod oil groove of the invention with a turntable and a laser processing machine;
FIG. 4 is a schematic top view of the laser machining and enlarging tool for connecting rod oil grooves according to the present invention;
FIG. 5 is a schematic perspective view of the laser-based link oil groove enlarging tool of the present invention;
FIG. 6 is an enlarged assembly explosion schematic view of the tooling for laser modeling of the connecting rod oil groove according to the present invention;
fig. 7 is an enlarged perspective view of the latch according to the present invention.
In the figure: 1. a connecting rod; 2. a laser molding machine; 3. a turntable; 4. a servo motor; 5. a dust recovery pipe; 6. a push cylinder; 7. a tooling assembly; 701. connecting blocks; 702. a self-centering splint; 703. an upper seat plate; 704. a sliding table; 705. a transverse linear bearing; 706. a connecting rod; 707. a base plate; 708. a longitudinal linear bearing; 709. a clamping block; 710. a base plate; 711. a return spring; 712. chip removal holes; 713. a T-shaped plate; 714. and a baffle plate.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
As shown in fig. 2 and 3, the laser modeling tool for the connecting rod oil groove is installed on a rotary table 3, each rotary table 3 at least comprises a feeding and discharging station and a processing station, and a servo motor 4 drives the rotary table 3 to rotate through a speed reducing mechanism. The upper part of the processing station is provided with a laser modeling instrument 2, and the lower part is provided with a dust recovery pipe 5; and a pushing cylinder 6 is installed at the feeding and discharging station, and the pushing cylinder 6 can drive the connecting block 701 of the tool assembly 7 to move back and forth.
As shown in fig. 4, 5, and 6, the tool assembly 7 includes:
the connecting block 701, the connecting block 701 is connected with the T-shaped plate 713 and drives the T-shaped plate to move back and forth,
a T-shaped plate 713, a slender rod is arranged on the T-shaped plate 713, a return spring 711 is sleeved on the slender rod, the slender rod penetrates through the baffle 714, the return spring 711 is extruded when the T-shaped plate 713 moves forwards,
the two sliding tables 704 are similar in shape and arranged in a mirror image mode, the two sliding tables 704 are symmetrically arranged by taking the T-shaped plate 713 as a center and are respectively hinged with the T-shaped rods through connecting rods 706, and the bottom of the front end of each sliding table 704 is provided with a transverse linear bearing 705, and the transverse linear bearings 705 are matched with the guide rails; the extending portion of the rear end of the sliding table 704 drives the clamping block 709 to move,
as shown in fig. 7, two clamping blocks 709 are symmetrically arranged and detachably connected with the extending portion of the sliding table 704, the clamping blocks 709 are provided with a plurality of vertical rods which are vertically and symmetrically arranged, the vertical rods are provided with arc-shaped protrusions, the arc-shaped protrusions can be in line contact with the inner wall of the big head of the connecting rod 1 and avoid the oil groove to be processed,
the connecting rod 1 is placed on the upper seat plate 703, and the upper seat plate 703 is provided with enough notches for the vertical rods of the clamping blocks 709 to extend out;
two self-centering splints 702 are symmetrically arranged and arranged on the upper seat plate 703, each self-centering splint 702 is provided with a telescopic elastic rod, a spring is arranged in each elastic rod, the front end of each elastic rod is spherical, the small end of the connecting rod 1 is embedded between the two elastic rods,
a bottom plate 707, install guide rail, dog on the bottom plate 707, and install backing plate 710, backing plate 710 is located between upper seat board 703 and bottom plate 707, places the extension of slip table 704 on backing plate 710, and leads to the extension through the step, all be provided with the clearance hole 712 that link up on backing plate 710 and the base, clearance hole 712 is located connecting rod 1 big head center below.
In one example, the connection block 701 includes an elongated vertical long rod, a vertical short rod connected to the T-shaped plate 713, and a horizontal rod connecting the long rod and the short rod, and the vertical long rod may be pushed by the telescopic rod of the pushing cylinder 6.
In one example, a longitudinal linear bearing 708 is mounted to the bottom of the T-shaped plate 713, and the longitudinal linear bearing 708 mates with a longitudinally disposed rail mounted to the bottom plate 707.
In one example, a proximity switch is installed on the side surface of the pushing cylinder 6, and the retraction and extension states of the pushing cylinder 6 are detected.
In one example, the lower portion of the plate 714 is notched to accommodate a rail or moving T-bar 713.
In one example, the extension of the sliding table 704 is provided with two rectangular grooves, the protrusion at the bottom of the latch 709 is embedded in the rectangular grooves, and the latch 709 is locked at the rectangular grooves by bolts.
In one example, the base plate 710 is provided with a limiting block between the extending portions of the two sliding tables 704, and when the extending portions approach, the limiting block prevents the clamping blocks 709 from being damaged due to too close.
The working principle of the invention is as follows:
in order to reduce the clearance between the tool and the connecting rod 1, the push cylinder 6 drives the push rod to move forward, the T-shaped plate 713 drives the hinged connecting rod 1, so that the sliding table 704 is separated and closed on the transverse linear bearing 705, and the two clamping blocks 709 are driven to expand or close. In order to avoid influencing the processing of the oil groove, the clamping block 709 is provided with an arc protrusion in line contact with the inner wall of the big head of the connecting rod 1, and a abdication is reserved. The contact force of the fixture block 709 with the inner wall of the big head of the connecting rod 1 is ensured by the return spring 711, the big head of the connecting rod 1 is prevented from being damaged by flexible contact, and self-centering positioning is ensured. The small end of the connecting rod 1 is limited in rotation by two self-centering clamping plates 702, and the self-centering clamping plates 702 are spring-driven elastic rods and also keep flexible contact.
The working process of the invention is as follows: when the connecting rod 1 is installed, the telescopic rod of the pushing cylinder 6 pushes the connecting block 701 to move forwards to drive the T-shaped plate 713 to extrude the return spring 711, the T-shaped plate 713 drives the sliding table 704 to approach to the middle under the action of the transverse linear bearing 705, the two clamping blocks 709 are close to each other, the large end of the connecting rod 1 is sleeved on the clamping blocks 709, and the small end of the connecting rod 1 is embedded between the elastic rods of the self-centering clamping plate 702; the telescopic rod of the pushing cylinder 6 is retracted, the T-shaped plate 713 moves backwards by means of the elastic force of the return spring 711 at the moment, the two sliding tables 704 are separated, the clamping block 709 is attached to the inner wall of the large end of the connecting rod 1, and the return spring 711 can be selected according to the elastic force requirement. When the connecting rod 1 is disassembled, the pushing cylinder 6 extends out, and the machined connecting rod 1 is taken out from the fixture block 709 and the self-centering clamping plate 702 for the next cycle.
In conclusion, the tool is suitable for connecting rods with different specifications, the tool is flexibly connected with the connecting rods, the positioning precision is high, the connecting rods can be driven to be automatically machined, and the working efficiency is high.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (7)
1. A tool for laser modeling of a connecting rod oil groove is arranged on rotary tables (3), each rotary table (3) at least comprises a feeding and discharging station and a processing station, a servo motor (4) drives the rotary tables (3) to rotate through a speed reducing mechanism,
the upper part of the processing station is provided with a laser modeling instrument (2), and the lower part is provided with a dust recovery pipe (5);
the method is characterized in that: a pushing cylinder (6) is arranged at the feeding and discharging station, the pushing cylinder (6) can drive a connecting block (701) of the tool assembly (7) to move back and forth,
the tool assembly (7) comprises:
the connecting block (701), the connecting block (701) is connected with the T-shaped plate (713) and drives the T-shaped plate to move back and forth,
the T-shaped plate (713), a slender rod is installed on the T-shaped plate (713), a return spring (711) is sleeved on the slender rod, the slender rod penetrates through the baffle (714), the return spring (711) is extruded when the T-shaped plate (713) moves forwards,
the two sliding tables (704) are similar in shape and arranged in a mirror image mode, are symmetrically arranged by taking a T-shaped plate (713) as a center and are respectively hinged with a T-shaped rod through a connecting rod (706), a transverse linear bearing (705) is installed at the bottom of the front end of each sliding table (704), and the transverse linear bearing (705) is matched with a guide rail; the extension part at the rear end of the sliding table (704) drives the clamping block (709) to move,
two clamping blocks (709) which are symmetrically arranged and are respectively detachably connected with the extending part of the sliding table (704), the clamping block (709) is provided with a plurality of vertical rods which are vertically and symmetrically arranged, the vertical rods are provided with arc-shaped bulges, the arc-shaped bulges can be in line contact with the inner wall of the large end of the connecting rod (1) and avoid the oil groove to be processed,
the connecting rod (1) is placed on the upper seat plate (703), and the upper seat plate (703) is provided with enough notches for the vertical rods of the clamping blocks (709) to extend out;
two self-centering splints (702) are symmetrically arranged and are arranged on the upper seat plate (703), each self-centering splint (702) is provided with a telescopic elastic rod, a spring is arranged in each elastic rod, the front end of each elastic rod is spherical, the small end of each connecting rod (1) is embedded between the two elastic rods,
bottom plate (707), install guide rail, dog on bottom plate (707), and install backing plate (710), backing plate (710) are located between bedplate (703) and bottom plate (707), place the extension of slip table (704) on backing plate (710), and lead to the extension through the step, all be provided with clearance hole (712) that link up on backing plate (710) and the base, clearance hole (712) are located connecting rod (1) major part center below.
2. The tool for laser forming of the oil groove of the connecting rod according to claim 1, wherein: the connecting block (701) comprises an extended vertical long rod, a vertical short rod connected with the T-shaped plate (713), and a horizontal rod connected with the long rod and the short rod, wherein the vertical long rod can be pushed by a telescopic rod of the pushing cylinder (6).
3. The tool for laser forming of the oil groove of the connecting rod according to claim 1 or 2, wherein: the bottom of the T-shaped plate (713) is provided with a longitudinal linear bearing (708), and the longitudinal linear bearing (708) is matched with a guide rail which is arranged on the bottom plate (707) in a longitudinal mode.
4. The tool for laser forming of the oil groove of the connecting rod according to claim 3, wherein: and a proximity switch is arranged on the side surface of the pushing cylinder (6) to detect the retraction and extension states of the pushing cylinder (6).
5. The tool for laser forming of the oil groove of the connecting rod according to claim 1, wherein: the lower portion of the baffle plate (714) is provided with a notch to accommodate a guide rail or a movable T-shaped plate (713).
6. The tool for laser forming of the oil groove of the connecting rod according to claim 1, wherein: the extension part of the sliding table (704) is provided with two rectangular grooves, the protruding part at the bottom of the clamping block (709) is embedded into the rectangular grooves, and the clamping block (709) is locked at the rectangular grooves through bolts.
7. The tool for laser forming of the oil groove of the connecting rod according to claim 1, wherein: the backing plate (710) is provided with a limiting block between the extending parts of the two sliding tables (704), and when the extending parts are close to each other, the limiting block is prevented from being too close to damage the clamping block (709).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110530670.4A CN113146023B (en) | 2021-05-15 | 2021-05-15 | Laser modeling tool for connecting rod oil groove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110530670.4A CN113146023B (en) | 2021-05-15 | 2021-05-15 | Laser modeling tool for connecting rod oil groove |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113146023A CN113146023A (en) | 2021-07-23 |
| CN113146023B true CN113146023B (en) | 2022-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110530670.4A Active CN113146023B (en) | 2021-05-15 | 2021-05-15 | Laser modeling tool for connecting rod oil groove |
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Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005074537A (en) * | 2003-08-28 | 2005-03-24 | Honda Motor Co Ltd | Connecting rod dividing method and dividing device |
| CN1326659C (en) * | 2004-04-26 | 2007-07-18 | 吉林大学 | Processing apparatus for initial cracking tank for engine connecting rod |
| CN101850473B (en) * | 2010-05-06 | 2012-10-31 | 长春吉扬华欣科技有限责任公司 | Laser processing equipment of connecting rod initial cracking groove of engine |
| CN102085578B (en) * | 2010-10-28 | 2013-12-25 | 广东工业大学 | Breakage processing lathe |
| CN102039444A (en) * | 2010-11-04 | 2011-05-04 | 奇瑞汽车股份有限公司 | Connecting rod cracking device and using method thereof |
| CN103171998B (en) * | 2013-03-21 | 2015-05-27 | 哈尔滨工程大学 | Oil drum embracing and taking device |
| CN107139026B (en) * | 2017-05-27 | 2018-06-26 | 南通澳润建材科技有限公司 | A kind of environmental protecting device |
| CN206869777U (en) * | 2017-06-30 | 2018-01-12 | 南宫市精强连杆有限公司 | The steady separator of connecting bar cover |
| CN108907736B (en) * | 2018-07-19 | 2023-12-05 | 湖北三峡职业技术学院 | Connecting rod processing system |
| CN211681071U (en) * | 2020-03-02 | 2020-10-16 | 山东鲁联机械制造有限公司 | Connecting rod fine boring large hole locking clamp |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A fixture for laser shaping of connecting rod oil grooves Granted publication date: 20220415 Pledgee: Bank of China Limited by Share Ltd. Yancheng branch Pledgor: Jiangsu Weima Yueda Intelligent Equipment Co.,Ltd. Registration number: Y2024980007373 |
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