CN220151857U - Combined planetary pin shaft for double-arm planet carrier - Google Patents
Combined planetary pin shaft for double-arm planet carrier Download PDFInfo
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- CN220151857U CN220151857U CN202321453527.0U CN202321453527U CN220151857U CN 220151857 U CN220151857 U CN 220151857U CN 202321453527 U CN202321453527 U CN 202321453527U CN 220151857 U CN220151857 U CN 220151857U
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- pin shaft
- planet carrier
- oil hole
- hole
- pin
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- 239000003921 oil Substances 0.000 claims abstract description 72
- 230000003287 optical effect Effects 0.000 claims abstract description 29
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 239000010687 lubricating oil Substances 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 16
- 230000004323 axial length Effects 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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Abstract
The utility model provides a combined planetary pin shaft for a double-arm planet carrier, which is characterized in that: the planet carrier is a double-arm planet carrier comprising an upwind direction pin shaft hole and a downwind direction pin shaft hole; the tensioning ring consists of a flange part and a cone part; the outer circle of the cone part is an outer cylindrical surface, and the inner circle is an inner conical surface; the pin shaft comprises a light shaft part and a cone part; the cone part of the tension ring is inserted into the upwind pin shaft hole of the planet carrier; the outer conical surface of the conical part of the pin shaft is matched with the inner conical surface of the conical part of the tensioning ring; the optical axis part of the pin shaft is inserted into a downwind pin shaft hole of the planet carrier and is fixed on the planet carrier; the inner holes of the bearing and the oil injection ring are sleeved on the pin shaft, and the inner hole of the planet wheel is sleeved on the bearing; a hydraulic oil hole structure for communicating the outside with the conical surface of the inner ring of the bearing and the tensioning ring is arranged in the pin shaft; a lubricating oil hole structure for communicating the outside with the oil injection ring is arranged in the pin shaft. The utility model improves the safety and stability of planetary transmission, prolongs the service life and reduces the maintenance cost.
Description
Technical Field
The utility model relates to the field of wind power gearboxes, in particular to a combined planetary pin shaft for a double-arm planet carrier.
Background
The pin shaft is used as one of members in planetary transmission, and in a wind power gear box, the pin shaft on the double-arm planet carrier is only one optical axis, and is in interference fit with the supporting seat hole during installation. Because the interference fit design of the pin shaft and the supporting seat is unreasonable, and the manufacturing errors are accumulated, the pin shaft is easy to be strained in the dismounting process. And only depend on single optical axis, along with fan gear box operating time's growth, planet wheel load is uneven, and easy crooked in the operation in-process, the round pin axle supporting seat hole degree of wear increases, can reduce the life of round pin axle and planet wheel, leads to planetary stage transmission inefficacy. When the pin shaft hole is worn, the existing bushing reworking scheme increases maintenance period and cost.
Disclosure of Invention
The utility model provides a combined planetary pin shaft for a double-arm planet carrier, which aims to solve the defects in the prior art, improve the safety and stability of planetary transmission, prolong the service life and reduce the maintenance cost.
The technical scheme adopted for solving the technical problems is as follows:
the utility model provides a combination formula planet round pin axle for both arms planet carrier which characterized in that:
the planet carrier is a double-arm planet carrier comprising an upwind direction pin shaft hole and a downwind direction pin shaft hole;
the tensioning ring consists of a flange part and a cone part; the outer circle of the cone part is an outer cylindrical surface, and the inner circle is an inner conical surface;
the pin shaft comprises a light shaft part and a cone part;
the bolts penetrate through the through holes of the flange parts of the tension rings, the tension rings are fixed on the planet carrier, and the cone parts of the tension rings are inserted into the upwind pin shaft holes of the planet carrier;
the outer conical surface of the conical part of the pin shaft is matched with the inner conical surface of the conical part of the tensioning ring;
the optical axis part of the pin shaft is inserted into a downwind pin shaft hole of the planet carrier, a bolt penetrates through a through hole of a flange part of the pressing plate to fix the pressing plate on the planet carrier, and a spigot of the pressing plate extends into the downwind pin shaft hole and presses the pin shaft;
the inner holes of the bearing and the oil injection ring are sleeved on the pin shaft, and the inner hole of the planet wheel is sleeved on the bearing;
a hydraulic oil hole structure for communicating the outside with the conical surface of the inner ring of the bearing and the tensioning ring is arranged in the pin shaft;
a lubricating oil hole structure for communicating the outside with the oil injection ring is arranged in the pin shaft.
The hydraulic oil hole structure is as follows:
the optical axis part of the pin shaft is close to one side end surface of the downwind pin shaft hole, a hydraulic oil hole is axially formed in the optical axis part, and the depth of the hydraulic oil hole extends from the end surface to the cone part of the pin shaft and is smaller than the axial length of the pin shaft;
an oil hole communicated with the axial hydraulic oil hole is arranged at the position of the optical axis part of the pin shaft, which is connected with the bearing, along the radial direction;
the cone part of the pin shaft is provided with an oil hole communicated with the axial hydraulic oil hole of the optical shaft part, and the oil hole is arranged along the radial direction of the pin shaft and is communicated with the inner cone surface of the tensioning ring.
The lubricating oil hole structure is as follows:
an annular groove is formed in the outer circle of the pin shaft part and is communicated with a radial oil hole of the planet carrier;
an oil hole is formed in the end face of the pin shaft along the axial direction, the axial oil hole extends from the optical axis part of the pin shaft to the cone part, and the depth of the axial oil hole is smaller than the axial length of the pin shaft and exceeds the middle part of the pin shaft;
the optical axis part of the pin shaft is provided with a radial oil hole communicated with the axial oil hole, and the radial oil hole is communicated with a central hole of the oil injection ring; the other radial oil hole is positioned at the center line of the annular groove, one end of the radial oil hole is communicated with the axial oil hole, and the other end of the radial oil hole is communicated with the radial oil hole of the planet carrier.
The tensioning ring is a thin-wall piece.
The cone part of the tension ring is provided with a notch, and the notch extends from the end face opening of the cone part to the flange part.
The tensioning ring is provided with at least 4 notches uniformly distributed on the circumference, and the notches are staggered with the plurality of through holes on the flange part.
The axial direction of the pin shaft is parallel to the axial direction of the pin shaft, and the axial direction of the pin shaft is parallel to the axial direction of the pin shaft.
The taper of the outer conical surface of the conical part of the pin shaft and the taper of the inner conical surface of the conical part of the tensioning ring are designed to be 1:6.
the utility model has the advantages that:
1) The combined pin shaft has simple structure and low manufacturing cost;
2) The hydraulic holes are reserved on the tensioning ring and the pin shaft, so that the dismounting and the mounting are convenient;
3) The safety and stability of planetary transmission are obviously improved;
4) The planetary stage load is effectively balanced, the failure rate of the planetary stage is reduced, and the service lives of the pin shaft and the planetary gear are prolonged; 5) The light fittings can be conveniently replaced when the pin shaft holes are worn, and the purpose of quick low-cost maintenance is achieved.
Drawings
The utility model will be further described with reference to the drawings and examples.
FIG. 1 is a cross-sectional view of the general structure of the present utility model;
FIG. 2 is a schematic view of the tension ring structure of the present utility model;
fig. 3 is a schematic perspective view of a pin according to the present utility model;
FIG. 4 is a cross-sectional view of the pin structure of the present utility model;
fig. 5 is a schematic view of a lubrication circuit according to the present utility model.
Detailed Description
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art. In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "bottom," and the like as used in this specification are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1:
the carrier 5 is a double-arm carrier, and the carrier 5 includes an upwind pin shaft hole 51 and a downwind pin shaft hole 52.
The pin shaft 1, the tension ring 2, the pressing plate 3 and the bolt 4 are the main body structure of the combined pin shaft.
As shown in fig. 2:
the tensioning ring 2 is composed of a flange part 21 and a cone part 22, wherein the flange part 21 is used for positioning and fastening and transmitting load; the cone portion 22 is used for connecting the planet carrier 5 and the pin 1. The outer circle of the cone part 22 is an outer cylindrical surface and is used for being connected with the planet carrier 5; the inner circle is designed into an inner conical surface and is used for being connected with the pin shaft 1.
Considering that the tension ring 2 needs to be easily stretched, the tension ring 2 is designed into a thin-wall piece.
The flange portion 21 of the tension ring 2 is provided with a plurality of through holes 211 which are uniformly arranged in the circumferential direction.
The cone portion 22 of the tension ring 2 is provided with a notch 221, which can reduce the rigidity of the tension ring 2 when the pin shaft 1 is assembled and disassembled. The notch 221 of the tension ring 2 extends from the end face opening of the cone part 22 to the flange part 21, and the extending length of the notch 221 does not exceed the flange part 21; the width of the notch 221 is as small as possible to prevent the tensioner ring 2 from being deformed too much when in use; at least 4 notches 221 of the tension ring 2 are uniformly arranged along the circumferential direction, and the notches 221 are staggered from the plurality of through holes 211 of the flange part 21.
The inner conical surface of the conical body 22 of the tensioning ring 2 is provided with a round corner at one end far away from the flange 21.
The outer cylindrical surface of the cone part 22 of the tensioning ring 2 is provided with a chamfer at one end far away from the flange part 21.
The outer cylindrical surface of the cone part 22 of the tensioning ring 2 is in transition fit with the inner hole of the planet carrier 5.
As shown in fig. 3 and 4:
the pin 1 comprises an optical shaft part 11 and a cone part 12, wherein the cone part 12 is used for being connected with the tensioning ring 2, and one end of the optical shaft part 11 is erected on the planet carrier 5 and used for supporting the planet wheels 6.
The outer circle of the cone part 12 of the pin shaft 1 is an outer cone surface and is matched with the inner cone surface of the cone part 22 of the tensioning ring 2.
The taper of the outer conical surface of the conical part 12 of the pin shaft 1 and the taper of the inner conical surface of the conical part 22 of the tensioning ring 2 are designed as 1: and 6, the taper can be adjusted according to actual use conditions.
The optical axis part 11 of the pin shaft 1 is in interference fit with a journal section matched with an inner hole of the planet wheel bearing 7, and is in transition fit with a downwind pin shaft hole 52 of the planet carrier 5.
The optical axis 11 of the pin 1 is provided with a hydraulic oil hole 111 in the axial direction on one end surface near the downwind pin hole 52, and the depth of the hydraulic oil hole 111 extends from the end surface to the cone 12 of the pin 1 and is smaller than the axial length of the pin 1.
The optical axis part 11 of the pin shaft 1 is provided with two oil holes 112 communicated with the axial hydraulic oil holes 111 along the radial direction at the connection position with the planetary gear bearing 7, the oil holes 112 are communicated with the inner ring of the bearing 7, and the oil holes 112 are positioned on the same side.
The cone portion 12 of the pin shaft 1 is provided with an oil hole 121 communicated with the axial hydraulic oil hole 111 of the optical axis portion 11, the oil hole 121 is arranged along the radial direction of the pin shaft 1, and the oil hole 121 is communicated with the inner conical surface of the tension ring 2 and is positioned on the same side as the oil hole 112 of the optical axis portion 11.
The end face of the pin shaft 1 is provided with a step hole 122 near one side of the upwind pin shaft hole 51, the step hole 122 is arranged at the axial center position of the pin shaft 1 and extends from the cone portion 12 of the pin shaft 1 to the optical shaft portion 11 along the axial direction, the depth of the step hole 122 is smaller than the axial length of the pin shaft 1 and does not exceed the middle of the pin shaft 1, and the step hole 122 can reduce stress concentration in the running process of the planet carrier 5.
An annular groove 113 is arranged on the outer circle of the pin shaft part 11 near one side of the downwind pin shaft hole 52, and the annular groove 113 is communicated with the radial oil hole 53 of the planet carrier 5.
An oil hole 114 is formed in the end face of the pin 1 near one side of the downwind pin shaft hole 52 in the axial direction, the axial oil hole 114 extends from the optical shaft portion 11 of the pin 1 to the cone portion 12, and the depth of the axial oil hole 114 is smaller than the axial length of the pin 1 and exceeds the middle of the pin 1. The axial oil holes 114 are offset from the axial hydraulic oil holes 111. The optical axis part 11 of the pin 1 is provided with a radial oil hole 115 communicated with the axial oil hole 114, the radial oil hole 115 is communicated with the central hole of the oil injection ring 8, the other radial oil hole 116 is positioned at the center line of the annular groove 113, one end of the radial oil hole 116 is communicated with the axial oil hole 114, and the other end of the radial oil hole 116 is communicated with the radial oil hole 53 of the planet carrier 5.
And a threaded hole 117 is formed in the end face of the pin shaft 1 and is close to one side of the downwind pin shaft hole 52, and the threaded hole 117 is axially formed in the center of the pin shaft 1 and is used for hoisting the pin shaft 1.
The outer conical surface of the conical body 12 of the pin shaft 1 is provided with a round angle near the optical axis 11.
The outer cylindrical surface of the optical axis part 11 of the pin shaft 1 is provided with a chamfer near the cone part 12.
The overall axial length of the tensioner ring 2 should be less than the axial length of the tapered portion 12 of the pin 1.
The flange part of the pressing plate 3 is provided with a plurality of through holes 31, the through holes 31 are uniformly distributed, and the shaft neck 32 at the spigot of the pressing plate 3 is matched with the downwind shaft hole 52 in a clearance fit.
As shown in fig. 1:
during actual installation, the planet wheel 6, the bearings 7 and the oil injection ring 8 are assembled into a planetary gear train, the two bearings 7 are sleeved in the inner hole of the planet wheel 6, and the oil injection ring 8 is positioned between the two bearings 7.
The conical surfaces of the pin shaft 1 and the tensioning ring 2 are coated with lubricating oil; the tension ring 2 is fitted into the upwind pin shaft hole 51 of the carrier 5 through the plurality of through holes 211 and bolts 4 in the tension ring 2.
Then the planetary gear train and the distance ring 9 are fitted.
After the pin shaft 1 is frozen, the pin shaft penetrates through a downwind pin shaft hole 52, penetrates through the inner ring of the bearing 7 and the oil injection ring 8, the conical surface of the pin shaft 1 is abutted against the conical surface of the tensioning ring 2, and the expansion locking of the pin shaft 1 and the tensioning ring 2 is realized by controlling the stroke; according to the stroke of the pin shaft 1, the pressing plate 3 is matched and ground, the pressing plate 3 is pressed on the planet carrier 5 through the through holes 31 and the bolts 4 on the pressing plate 3, the spigot of the pressing plate 3 is inserted into the downwind pin shaft hole 52 and presses the pin shaft 1, so that the axial positioning and fastening of the pin shaft 1 are realized, and the positioning and fastening of the combined pin shaft 1 on two sides of the double-arm planet carrier 5 are ensured, and the sliding is not easy to generate.
When the device is actually disassembled:
firstly, loosening the bolt 4 to detach the pressing plate 3; then, the pin shaft 1 is separated from the tensioning ring 2 through a hydraulic oil hole 111 and an oil hole 121 on the pin shaft 1 by a hydraulic disassembly method, meanwhile, the pin shaft 1 is separated from the inner ring of the bearing 7 through the hydraulic oil hole 111 and the oil hole 112 on the pin shaft 1, and the pin shaft 1 is pulled out through a downwind pin shaft hole 52; finally, the tensioning ring 2 is detached by loosening the bolts 4, so that the combined pin shaft 1 can be conveniently and rapidly separated from the planet carrier 5 and the planet gears 6.
As shown in fig. 5:
the arrow in the figure shows the forced lubrication oil way of this structure. The oil enters the annular groove 113 of the pin shaft 1 through the radial oil hole 53 of the planet carrier 5, passes through the radial oil hole 116 on the annular groove 113, then passes through the axial oil hole 114, flows to the radial oil hole 115, reaches the oil injection ring 8, and is injected into the bearing 7 from the through hole of the oil injection ring 8, so that the forced lubrication of the planet wheel bearing 7 is realized.
The utility model discloses a combined planetary pin shaft for a double-arm planetary carrier, which comprises a tensioning ring, a pin shaft, a pressing plate and a connecting bolt. The slot is formed in the tension ring, and rigidity of the tension ring can be reduced when the pin shaft is installed and detached. The pin shaft is extruded on the tensioning ring through the conical surface, elastic deformation is generated when the tensioning ring is subjected to the pressure of the pin shaft, the expansion locking of the combined pin shaft is realized, the pressing plate on the other side is pressed, and the combined pin shaft is positioned and fastened on two sides of the double-arm planet carrier and is not easy to slide. Meanwhile, the pin shaft body is provided with a hydraulic oil hole for convenient installation and disassembly. The step holes are formed in the pin shafts, so that stress concentration can be reduced, meanwhile, the weight of the pin shafts is reduced, the torque transmission performance of the pin shafts can be further improved, the load of the planet gears is balanced, the combined pin shafts are assembled and disassembled safely and conveniently, the stability of the structure is remarkably improved, and the failure rate of the planet stage is reduced. Considering the maintenance of the gear box in the maintenance period, when the upwind pin shaft hole is worn, the outer diameter size of the tensioning ring is changed instead of the traditional pin shaft Kong Xiangtao to be reprocessed, so that the clamping and meter correcting times and the processing cost of the double-arm planet carrier are reduced, and for batch maintenance, the maintenance cost of the gear box can be greatly reduced, and the maintenance period is shortened.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides a combination formula planet round pin axle for both arms planet carrier which characterized in that:
the planet carrier is a double-arm planet carrier comprising an upwind direction pin shaft hole and a downwind direction pin shaft hole;
the tensioning ring consists of a flange part and a cone part; the outer circle of the cone part is an outer cylindrical surface, and the inner circle is an inner conical surface;
the pin shaft comprises a light shaft part and a cone part;
the bolts penetrate through the through holes of the flange parts of the tension rings, the tension rings are fixed on the planet carrier, and the cone parts of the tension rings are inserted into the upwind pin shaft holes of the planet carrier;
the outer conical surface of the conical part of the pin shaft is matched with the inner conical surface of the conical part of the tensioning ring;
the optical axis part of the pin shaft is inserted into a downwind pin shaft hole of the planet carrier, a bolt penetrates through a through hole of a flange part of the pressing plate to fix the pressing plate on the planet carrier, and a spigot of the pressing plate extends into the downwind pin shaft hole and presses the pin shaft;
the inner holes of the bearing and the oil injection ring are sleeved on the pin shaft, and the inner hole of the planet wheel is sleeved on the bearing;
a hydraulic oil hole structure for communicating the outside with the conical surface of the inner ring of the bearing and the tensioning ring is arranged in the pin shaft;
a lubricating oil hole structure for communicating the outside with the oil injection ring is arranged in the pin shaft.
2. A combined planetary pin for a double arm planet carrier as claimed in claim 1, wherein: the hydraulic oil hole structure is as follows:
the optical axis part of the pin shaft is close to one side end surface of the downwind pin shaft hole, a hydraulic oil hole is axially formed in the optical axis part, and the depth of the hydraulic oil hole extends from the end surface to the cone part of the pin shaft and is smaller than the axial length of the pin shaft;
an oil hole communicated with the axial hydraulic oil hole is arranged at the position of the optical axis part of the pin shaft, which is connected with the bearing, along the radial direction;
the cone part of the pin shaft is provided with an oil hole communicated with the axial hydraulic oil hole of the optical shaft part, and the oil hole is arranged along the radial direction of the pin shaft and is communicated with the inner cone surface of the tensioning ring.
3. A combined planetary pin for a double arm planet carrier as claimed in claim 1, wherein: the lubricating oil hole structure is as follows:
an annular groove is formed in the outer circle of the pin shaft part and is communicated with a radial oil hole of the planet carrier;
an oil hole is formed in the end face of the pin shaft along the axial direction, the axial oil hole extends from the optical axis part of the pin shaft to the cone part, and the depth of the axial oil hole is smaller than the axial length of the pin shaft and exceeds the middle part of the pin shaft;
the optical axis part of the pin shaft is provided with a radial oil hole communicated with the axial oil hole, and the radial oil hole is communicated with a central hole of the oil injection ring; the other radial oil hole is positioned at the center line of the annular groove, one end of the radial oil hole is communicated with the axial oil hole, and the other end of the radial oil hole is communicated with the radial oil hole of the planet carrier.
4. A combined planetary pin for a double arm planet carrier as claimed in claim 1, wherein: the tensioning ring is a thin-wall piece.
5. A combined planetary pin for a double arm planet carrier as claimed in claim 1, wherein: the cone part of the tension ring is provided with a notch, and the notch extends from the end face opening of the cone part to the flange part.
6. A combined planetary pin for a double arm planet carrier as claimed in claim 5, wherein: the tensioning ring is provided with at least 4 notches uniformly distributed on the circumference, and the notches are staggered with the plurality of through holes on the flange part.
7. A combined planetary pin for a double arm planet carrier as claimed in claim 1, wherein: the axial direction of the pin shaft is parallel to the axial direction of the pin shaft, and the axial direction of the pin shaft is parallel to the axial direction of the pin shaft.
8. A combined planetary pin for a double arm planet carrier as claimed in claim 1, wherein: the taper of the outer conical surface of the conical part of the pin shaft and the taper of the inner conical surface of the conical part of the tensioning ring are designed to be 1:6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321453527.0U CN220151857U (en) | 2023-06-08 | 2023-06-08 | Combined planetary pin shaft for double-arm planet carrier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321453527.0U CN220151857U (en) | 2023-06-08 | 2023-06-08 | Combined planetary pin shaft for double-arm planet carrier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220151857U true CN220151857U (en) | 2023-12-08 |
Family
ID=89017748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321453527.0U Active CN220151857U (en) | 2023-06-08 | 2023-06-08 | Combined planetary pin shaft for double-arm planet carrier |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220151857U (en) |
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2023
- 2023-06-08 CN CN202321453527.0U patent/CN220151857U/en active Active
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