CN210098922U - Aluminum alloy connecting rod die with vertically distributed cavities - Google Patents
Aluminum alloy connecting rod die with vertically distributed cavities Download PDFInfo
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- CN210098922U CN210098922U CN201920445558.9U CN201920445558U CN210098922U CN 210098922 U CN210098922 U CN 210098922U CN 201920445558 U CN201920445558 U CN 201920445558U CN 210098922 U CN210098922 U CN 210098922U
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Abstract
The utility model provides a die cavity vertical distribution's aluminum alloy connecting rod mould, including cover half core and movable mould core, cover half core and movable mould core surround form inside for the melt sprue of bar and with a plurality of connecting rod body die cavities of melt sprue intercommunication, it is a plurality of two bisymmetries of connecting rod body die cavity set up in the both sides of melt sprue, connecting rod body die cavity comprises locating first connecting rod body die cavity on the cover half core and locating the second connecting rod body die cavity on the movable mould core, first exhaust passage and second exhaust passage have been seted up respectively to the connecting rod gusset shaping department of first connecting rod body die cavity and second connecting rod body die cavity, and first exhaust passage and second exhaust passage run through cover half core and movable mould core respectively. The utility model discloses a connecting rod mould can a plurality of aluminum alloy connecting rods of die-casting production simultaneously, can the effectual cold shut, gas pocket or the shrinkage cavity of connecting rod shaping back gusset department of reduction, effectively improved the intensity of connecting rod.
Description
Technical Field
The utility model belongs to the technical field of aluminum alloy connecting rod die-casting production mould, concretely relates to aluminium alloy connecting rod mould of vertical distribution in die cavity.
Background
The aluminum alloy connecting rod die-casting production die is characterized by comprising a die body, wherein the die body is provided with a plurality of aluminum alloy connecting rods, the aluminum alloy connecting rods are arranged in the die body, and the aluminum alloy connecting rods are arranged in the die body.
Aiming at an aluminum alloy connecting rod die-casting die with a connecting rod body cavity vertically distributed along two sides of a melt flow channel in the die, when the die is used for die-casting production of a connecting rod by using the die for die-casting production of the aluminum alloy connecting rod, aluminum alloy melt is poured into the connecting rod body cavity of the die, an exhaust runner groove communicated with the connecting rod body cavity is arranged in the die, the aluminum alloy melt drives air to enter the exhaust runner groove for exhaust, so that the aluminum alloy melt fills the connecting rod body cavity and is cooled to form the connecting rod, in the process that the aluminum alloy melt fills the connecting rod body cavity, a big end forming cavity and a small end forming cavity of the connecting rod body are often filled firstly under the action of air pressure in the connecting rod body cavity, finally the aluminum alloy melt is gathered at a connecting rod rib plate forming part of the connecting rod body cavity, because the gas at the connecting rod rib plate forming part of the connecting, thereby directly influencing the strength of the connecting rod and easily reducing the service life of the engine.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not enough to prior art exists, the utility model provides an aluminum alloy connecting rod mould of vertical distribution of die cavity, the inside of this connecting rod mould is equipped with a plurality of connecting rod body die cavities along the vertical distribution of melt sprue both sides, utilize this connecting rod mould can a plurality of aluminum alloy connecting rods of die-casting production simultaneously, all be equipped with the exhaust passage on the fixed mold core and the movable mold core of the gusset shaping department corresponding to every connecting rod body die cavity, during the die-casting, melt driving air to the gusset shaping department of connecting rod body die cavity, exhaust passage discharge connecting rod body die cavity can be followed to the air, thereby can effectually reduce the cold shut of gusset department behind the connecting rod body shaping, gas pocket or shrinkage cavity, the intensity of connecting rod has effectively been improved.
The utility model discloses a following technical scheme realizes:
an aluminum alloy connecting rod mold with vertically distributed cavities comprises a fixed mold core and a movable mold core, wherein the fixed mold core and the movable mold core are surrounded to form a strip-shaped molten main runner and a plurality of connecting rod body cavities communicated with the molten main runner, the connecting rod body cavities are arranged on two sides of the molten main runner in a pairwise symmetry manner, when a connecting rod is die-cast, molten liquid can flow to the connecting rod body cavities from the molten main runner, each connecting rod body cavity consists of a first connecting rod body cavity arranged on the fixed mold core and a second connecting rod body cavity arranged on the movable mold core, at least one first exhaust passage is arranged at a connecting rod rib plate forming position in the first connecting rod body cavity, at least one second exhaust passage is arranged at a connecting rod rib plate forming position in the second connecting rod body cavity, and the first exhaust passage is communicated with the outer surface of the fixed mold core through the connecting rod rib plate forming position in the first connecting rod, the second exhaust passage is communicated with the outer surface of the movable mold core from a connecting rod rib plate forming position in the second connecting rod body cavity, when the connecting rod is die-cast, molten liquid drives air to the rib plate forming position of the connecting rod body cavity, and the air can be led out of the fixed mold core and the movable mold core from the first exhaust passage and the second exhaust passage respectively, so that cold insulation, air holes or shrinkage cavities at the rib plate position after the connecting rod body is formed can be effectively reduced, the strength of the connecting rod is effectively improved, and accidents caused by the breakage of the connecting rod of an engine are avoided.
Further, all be equipped with the exhaust stifled piece in first exhaust passage and the second exhaust passage, all leave the clearance between exhaust stifled piece and first exhaust passage and the second exhaust passage, the exhaust stifled piece can prevent to block up first exhaust passage and second exhaust passage after the melt cooling, and during the die-casting connecting rod, the air of connecting rod gusset shaping department is discharged by the clearance, takes out the exhaust stifled piece after the connecting rod body drawing of patterns, can be convenient for dredge first exhaust passage and second exhaust passage.
Furthermore, the sections of the first exhaust passage and the second exhaust passage are circular or strip-shaped, the corresponding exhaust blocking piece is needle-shaped or plate-shaped, the appropriate section shape of the exhaust passage is selected according to the size and the exhaust amount of the connecting rod, and the exhaust amount of the square exhaust passage is larger than that of the circular exhaust passage.
Further, the fixed die core outer surface at the first exhaust passage outlet and the movable die core outer surface at the second exhaust passage outlet are both provided with key grooves, limiting keys are arranged in the key grooves, one ends of the exhaust plugs are fixed on the limiting keys, the exhaust plugs can be prevented from falling into the connecting rod body cavities, and the exhaust plugs can be taken out conveniently.
Further, the one end in the connecting rod body major part molding cavity of first connecting rod body die cavity and second connecting rod body die cavity all is linked together with the melt sprue, the internal surface of movable mould core is equipped with a plurality of exhaust runner grooves, and is a plurality of exhaust runner groove extends to second connecting rod body die cavity direction and is linked together with the different positions in connecting rod body minor part molding cavity respectively by the lateral wall of movable mould core, and during the die-casting connecting rod, the aluminum alloy melt flows to connecting rod body intracavity by the one end in melt sprue through connecting rod body major part molding cavity to the air in the drive connecting rod body intracavity, and the air is discharged by exhaust runner groove, makes the aluminum alloy melt fill connecting rod body die cavity, forms the connecting rod after the cooling.
Further, the other end of the connecting rod body big-end forming cavity of first connecting rod body cavity and second connecting rod body cavity all is equipped with first stub bar package, and is a plurality of all be equipped with the second stub bar package on the exhaust runner groove, and the second stub bar package is close to connecting rod body small-end forming cavity, all be equipped with the thimble hole on first stub bar package, second stub bar package on the movable mould core and the exhaust runner groove, just the thimble hole runs through to the surface of movable mould core, and during the die-casting connecting rod, first stub bar package, second stub bar package and exhaust runner groove are filled to the aluminium alloy melt, and the first stub bar package of ejecting through the thimble during the connecting rod body drawing of patterns, second stub bar package and the last cooling shaping aluminium alloy stub bar of exhaust runner groove can be convenient for the drawing of patterns, prevent that the connecting rod body from damaging.
Furthermore, the bottoms of the fixed mold core and the movable mold core are respectively provided with a die-casting material handle opening, the die-casting material handle openings are communicated with the molten liquid main runner, and the die-casting shunt cones can be arranged at the die-casting material handle openings when the mold is installed.
Furthermore, the size of the gap is 0.05-0.10 mm, and air can be effectively led out from the gap.
Furthermore, the first exhaust passage and the second exhaust passage are three, the cross sections of the first exhaust passage and the second exhaust passage are circular, the connecting rod rib plate forming positions of the first exhaust passage in the first connecting rod body cavity are distributed at intervals along the connecting line direction of the connecting rod body large-end forming cavity and the connecting rod body small-end forming cavity, the connecting rod rib plate forming positions of the second exhaust passage in the second connecting rod body cavity are distributed at intervals along the connecting line direction of the connecting rod body large-end forming cavity and the connecting rod body small-end forming cavity, and the exhaust effect of the connecting rod rib plate forming positions can be effectively improved.
Furthermore, the number of the connecting rod body cavities is eight, and eight connecting rod bodies can be die-cast at one time by using the connecting rod die.
According to the above technical scheme, the utility model provides a pair of aluminium alloy connecting rod mould of die cavity vertical distribution, beneficial effect lies in: the inside of this connecting rod mould is equipped with along a plurality of connecting rod body die cavities of melt sprue both sides vertical distribution, utilize this connecting rod mould can be a plurality of aluminum alloy connecting rods of die-casting production simultaneously, be equipped with first exhaust flue and second exhaust flue on the fixed mold core and the movable mold core of the gusset shaping department corresponding to every connecting rod body die cavity respectively, during die-casting, melt driving air is to the gusset shaping department of connecting rod body die cavity, fixed mold core and movable mold core can be drawn forth from first exhaust flue and second exhaust flue respectively to the air, thereby can effectually reduce the cold shut of gusset department after the connecting rod body shaping, gas pocket or shrinkage cavity, the intensity of connecting rod has effectively been improved, avoid the engine because of the accident that the connecting rod fracture produced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic view of the inner surface structure of the fixed mold core of the present invention.
Fig. 3 is a schematic view of the inner surface structure of the movable mold core of the present invention.
Fig. 4 is a partial structural diagram at I in fig. 2.
Fig. 5 is a schematic view of a partial structure at II in fig. 3.
Fig. 6 is a partial sectional view taken in the direction of a-a in fig. 4.
In the drawings: 1-fixed die core, 11-die casting material handle mouth, 2-movable die core, 21-exhaust runner groove, 22-first material head bag, 23-second material head bag, 24-thimble hole, 3-molten liquid main runner, 41-first connecting rod body cavity, 42-second connecting rod body cavity, 51-first exhaust duct, 52-second exhaust duct, 6-exhaust block piece, 7-keyway and 8-limit key.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
In the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1 to 6, an aluminum alloy connecting rod mold with vertically distributed cavities comprises a fixed mold core 1 and a movable mold core 2, wherein the fixed mold core 1 and the movable mold core 2 surround to form a melt main runner 3 with a strip shape inside and eight connecting rod body cavities communicated with the melt main runner 3, the eight connecting rod body cavities are arranged on two sides of the melt main runner 3 in a pairwise symmetry manner, when a connecting rod is die-cast, melt can flow from the melt main runner 3 to the connecting rod body cavities, each connecting rod body cavity is composed of a first connecting rod body cavity 41 arranged on the fixed mold core 1 and a second connecting rod body cavity 42 arranged on the movable mold core 2, a connecting rod rib plate forming position in the first connecting rod body cavity 41 is provided with three first exhaust channels 51, a connecting rod rib plate forming position in the second connecting rod body cavity 42 is provided with three second exhaust channels 52, the first exhaust channels 51 are communicated with the outer surface of the fixed mold core 1 through the connecting rod rib plate forming position in the first connecting rod body cavity, the second exhaust passage 52 is communicated with the outer surface of the movable mold core 2 from a connecting rod rib plate forming position in the second connecting rod body cavity 42, when the connecting rod is die-cast, molten liquid drives air to the rib plate forming position of the connecting rod body cavity, and the air can be respectively led out of the fixed mold core 1 and the movable mold core 2 from the first exhaust passage 51 and the second exhaust passage 52, so that cold insulation, air holes or shrinkage cavities at the rib plate position after the connecting rod body is formed can be effectively reduced, the strength of the connecting rod is effectively improved, and accidents caused by the breakage of the connecting rod of an engine are avoided.
In this embodiment, all be equipped with exhaust stifled piece 6 in first exhaust passage 51 and the second exhaust passage 52, all leave the clearance between exhaust stifled piece 6 and first exhaust passage 51 and the second exhaust passage 52, the clearance size is 0.05~0.10mm, and exhaust stifled piece 6 can prevent to block up first exhaust passage 51 and second exhaust passage 52 after the melt cooling, the cross-section of exhaust passage is circular, and corresponding exhaust stifled piece 6 is the aciculiform, and during the die-casting connecting rod, the air of connecting rod gusset shaping department is discharged by the clearance, takes out exhaust stifled piece 6 after the connecting rod body drawing of patterns, can be convenient for dredge first exhaust passage 51 and second exhaust passage 52.
In this embodiment, the outer surface of the fixed mold core 1 at the outlet of the first exhaust passage 51 and the outer surface of the movable mold core 2 at the outlet of the second exhaust passage 52 are both provided with a key groove 7, a limit key 8 is arranged in the key groove 7, and one end of the exhaust blocking piece 6 is fixed on the limit key 8, so that the exhaust blocking piece 6 can be prevented from falling into the connecting rod body cavity, and the exhaust blocking piece 6 can be taken out conveniently.
In this embodiment, the one end of the connecting rod body big end forming cavity of the first connecting rod body cavity 41 and the second connecting rod body cavity 42 is communicated with the melt main runner 3, the inner surface of the movable mold core 2 is provided with a plurality of exhaust runner channels 21, which are a plurality of the exhaust runner channels 21 extend from the side wall of the movable mold core 2 to the second connecting rod body cavity 42 and are respectively communicated with different positions of the connecting rod body small end forming cavity, when the connecting rod is die-cast, the melt aluminum alloy flows into the connecting rod body cavity from the melt main runner 3 through the one end of the connecting rod body big end forming cavity and drives the air in the connecting rod body cavity, and the air is discharged from the exhaust runner channels 21, so that the connecting rod body cavity is filled with the melt aluminum alloy, and the connecting rod is formed after cooling.
In this embodiment, the other end of the connecting rod body big end forming cavity of the first connecting rod body cavity 41 and the second connecting rod body cavity 42 is provided with a first stub bar packet 22, and is multiple of the exhaust runner groove 21 is provided with a second stub bar packet 23, and the second stub bar packet 23 is close to the connecting rod body small end forming cavity, the first stub bar packet 22, the second stub bar packet 23 and the exhaust runner groove 21 on the movable mold core 2 are provided with a thimble hole 24, and the thimble hole 24 penetrates through the outer surface of the movable mold core 2, when the connecting rod is die-cast, the first stub bar packet 22, the second stub bar packet 23 and the exhaust runner groove 21 are filled with the molten aluminum alloy, and when the connecting rod body is demolded, the first stub bar packet 22, the second stub bar packet 23 and the aluminum alloy stub bar formed by cooling on the exhaust runner groove 21 are ejected through the thimble, so as to facilitate demolding and prevent the connecting rod body from being damaged.
In this embodiment, the bottoms of the fixed mold core 1 and the movable mold core 2 are both provided with a die-casting material handle opening 11, the die-casting material handle opening 11 is communicated with the molten liquid main runner 3, and when the mold is installed, the die-casting spreader cone can be installed at the die-casting material handle opening 11.
The working principle of the embodiment is as follows: when the connecting rod is die-cast, the fixed die core 1 and the movable die core 2 are arranged on a die-casting device, an aluminum alloy melt is injected into a melt main runner 3 through a spreader cone arranged at a die-casting material handle opening 11, the aluminum alloy melt is split in the upward process of the melt main runner 3 and enters a connecting rod body cavity from one end of a connecting rod body big-end molding cavity communicated with the melt main runner 3, the aluminum alloy melt flows and drives air in the connecting rod body cavity, the aluminum alloy melt flows in the direction with small flow resistance in the connecting rod body cavity, the aluminum alloy melt flows in the directions of the other end of the connecting rod body big-end molding cavity and the connecting rod body small-end molding cavity from one end of the connecting rod body big-end molding cavity respectively, the connecting rod body small-end molding cavity and the big-end molding cavity are filled with the connecting rod body small-end molding cavity and the connecting rod body big-end molding cavity, a first stub bar 22, a second stub bar 23 and an exhaust runner groove 21, and, finally, the molten aluminum alloy is converged at the middle part of the forming part of the connecting rod rib plate, and in the process that the molten aluminum alloy is converged at the middle part of the forming part of the connecting rod rib plate, air is led out of the fixed mold core 1 and the movable mold core 2 from the first exhaust passage 51 and the second exhaust passage 52 which are communicated with the forming part of the connecting rod rib plate, so that cold partitions, air holes or shrinkage cavities at the rib plate after the connecting rod is formed are effectively reduced, and the strength of the connecting rod is effectively improved; after the molten aluminum alloy in the mold is cooled and formed, the first stub bar packet 22, the second stub bar packet 23 and the aluminum alloy stub bars in the exhaust runner channel 21 are jacked through the ejector pins to be demolded, so that the connecting rod body can be prevented from being damaged; eight aluminum alloy connecting rods can be simultaneously die-cast and produced by utilizing the connecting rod die.
In the specification of the present invention, a large number of specific details are explained. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. The utility model provides an aluminum alloy connecting rod mould of vertical distribution of die cavity, includes and decides die core (1) and moves die core (2), decide die core (1) and move die core (2) and surround a plurality of connecting rod body die cavities that form inside melt sprue (3) and communicate with melt sprue (3) for the bar, its characterized in that: the connecting rod body cavities are symmetrically arranged on two sides of the molten liquid main runner (3) in pairs, each connecting rod body cavity is composed of a first connecting rod body cavity (41) arranged on the fixed mold core (1) and a second connecting rod body cavity (42) arranged on the movable mold core (2), at least one first exhaust channel (51) is formed in a connecting rod rib plate forming position in the first connecting rod body cavity (41), at least one second exhaust channel (52) is formed in a connecting rod rib plate forming position in the second connecting rod body cavity (42), the first exhaust channel (51) is communicated with the outer surface of the fixed mold core (1) through the connecting rod rib plate forming position in the first connecting rod body cavity (41), and the second exhaust channel (52) is communicated with the outer surface of the movable mold core (2) through the connecting rod rib plate forming position in the second connecting rod body cavity (42).
2. The aluminum alloy connecting rod die with vertically distributed cavities as claimed in claim 1, wherein: exhaust blocking pieces (6) are arranged in the first exhaust passage (51) and the second exhaust passage (52), and gaps are reserved among the exhaust blocking pieces (6), the first exhaust passage (51) and the second exhaust passage (52).
3. The aluminum alloy connecting rod mold with vertically distributed cavities as claimed in claim 2, wherein: the sections of the first exhaust passage (51) and the second exhaust passage (52) are circular or strip-shaped, and the corresponding exhaust blocking piece (6) is needle-shaped or plate-shaped.
4. The aluminum alloy connecting rod die with vertically distributed cavities as claimed in claim 2 or 3, wherein: the outer surface of the fixed mold core (1) at the outlet of the first exhaust passage (51) and the outer surface of the movable mold core (2) at the outlet of the second exhaust passage (52) are both provided with key grooves (7), limiting keys (8) are arranged in the key grooves (7), and one end of the exhaust blocking piece (6) is fixed on the limiting keys (8).
5. The aluminum alloy connecting rod mold with vertically distributed cavities as claimed in claim 4, wherein: the one end in the big head of connecting rod body molding chamber of first connecting rod body die cavity (41) and second connecting rod body die cavity (42) all is linked together with liquation sprue (3), the internal surface of movable mould core (2) is equipped with a plurality of exhaust runner grooves (21), and is a plurality of exhaust runner grooves (21) extend to second connecting rod body die cavity (42) direction by the lateral wall of movable mould core (2) and are linked together with the different positions in the little head molding chamber of connecting rod body respectively.
6. The aluminum alloy connecting rod mold with vertically distributed cavities as claimed in claim 5, wherein: the other end in the connecting rod body major part molding cavity of first connecting rod body die cavity (41) and second connecting rod body die cavity (42) all is equipped with first stub bar package (22), and is a plurality of all be equipped with second stub bar package (23) on exhaust runner groove (21), and second stub bar package (23) are close to connecting rod body microcephaly molding cavity, all be equipped with thimble hole (24) on first stub bar package (22), second stub bar package (23) on movable mould core (2) and exhaust runner groove (21), just thimble hole (24) run through to the surface of movable mould core (2).
7. The aluminum alloy connecting rod mold with vertically distributed cavities as claimed in claim 6, wherein: the bottom of the fixed mold core (1) and the bottom of the movable mold core (2) are both provided with a die-casting material handle opening (11), and the die-casting material handle opening (11) is communicated with the molten liquid main runner (3).
8. The aluminum alloy connecting rod mold with vertically distributed cavities as claimed in claim 2, wherein: the size of the gap is 0.05-0.10 mm.
9. The aluminum alloy connecting rod mold with vertically distributed cavities as claimed in claim 3, wherein: the number of the first exhaust passages (51) and the number of the second exhaust passages (52) are three, and the sections of the first exhaust passages (51) and the second exhaust passages (52) are circular.
10. The aluminum alloy connecting rod die with vertically distributed cavities as claimed in claim 1, wherein: the number of the connecting rod body cavities is eight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920445558.9U CN210098922U (en) | 2019-04-03 | 2019-04-03 | Aluminum alloy connecting rod die with vertically distributed cavities |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920445558.9U CN210098922U (en) | 2019-04-03 | 2019-04-03 | Aluminum alloy connecting rod die with vertically distributed cavities |
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| Publication Number | Publication Date |
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| CN210098922U true CN210098922U (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920445558.9U Active CN210098922U (en) | 2019-04-03 | 2019-04-03 | Aluminum alloy connecting rod die with vertically distributed cavities |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111842838A (en) * | 2020-08-31 | 2020-10-30 | 重庆环鹰机械有限公司 | Die-casting connecting rod body ejection method, die-casting connecting rod cavity structure and die-casting mold |
| CN112207251A (en) * | 2020-09-08 | 2021-01-12 | 铜陵市慧智机电有限责任公司 | Rotary exhaust ejector rod |
-
2019
- 2019-04-03 CN CN201920445558.9U patent/CN210098922U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111842838A (en) * | 2020-08-31 | 2020-10-30 | 重庆环鹰机械有限公司 | Die-casting connecting rod body ejection method, die-casting connecting rod cavity structure and die-casting mold |
| CN112207251A (en) * | 2020-09-08 | 2021-01-12 | 铜陵市慧智机电有限责任公司 | Rotary exhaust ejector rod |
| CN112207251B (en) * | 2020-09-08 | 2022-04-26 | 铜陵市慧智机电有限责任公司 | Rotary exhaust ejector rod |
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