CN219665326U - Electrolytic machining equipment for ball circulation path of ball screw pair nut - Google Patents
Electrolytic machining equipment for ball circulation path of ball screw pair nut Download PDFInfo
- Publication number
- CN219665326U CN219665326U CN202223172050.7U CN202223172050U CN219665326U CN 219665326 U CN219665326 U CN 219665326U CN 202223172050 U CN202223172050 U CN 202223172050U CN 219665326 U CN219665326 U CN 219665326U
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- 238000003754 machining Methods 0.000 title claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 19
- 230000007246 mechanism Effects 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 19
- 230000008569 process Effects 0.000 abstract description 13
- 238000003672 processing method Methods 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 2
- 230000003746 surface roughness Effects 0.000 abstract description 2
- 239000003792 electrolyte Substances 0.000 description 9
- 230000006872 improvement Effects 0.000 description 9
- 238000005096 rolling process Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 206010063385 Intellectualisation Diseases 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000002848 electrochemical method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The utility model relates to ball screw pair nut ball circulation path electrolytic machining equipment which comprises a horizontal workbench, wherein a horizontal movable workbench and a stand column are arranged on the horizontal workbench, a rotatable magnetic workbench is arranged on the horizontal movable workbench, a V-shaped positioning block is arranged on the rotatable magnetic workbench, the stand column is positioned on one side of the horizontal movable workbench, a vertical movable workbench is arranged on the stand column, and a cathode ball head is arranged on the vertical movable workbench. The utility model can process complex curved surface structure of nut ball circulation path by electrochemical processing method, and can process multiple parts at one time. The processing method is not limited by the hardness of the material, can process the quenched workpiece, has high processing precision and good surface roughness, and the curved surface shape design of the ball circulation path is not limited by processing equipment and capability, so that the processing requirement of any curved surface can be met.
Description
Technical Field
The utility model belongs to the field of ball screw manufacturing, and relates to electrolytic machining equipment for a ball circulation path of a ball screw pair nut.
Background
Currently, automobiles are moving toward motorization and intellectualization. Under the wave of motorization and intellectualization of automobiles, with the increasing popularity of auxiliary driving systems and the gradual landing of automatic driving systems, new demands of increasingly abundant intellectualization scenes are derived. Driven by this surge, automobiles also place a higher demand on braking systems. Automotive braking systems have also evolved from hydraulic braking, electromechanical and hydraulic fusion braking to current brake-by-wire systems. Whereas the brake-by-wire system is widely regarded as the final solution for intelligent and automatic driving of automobiles.
At present, in a brake-by-wire system, a ball screw is used as an execution component of the brake-by-wire system, and plays a very key role in the aspects of stability, reliability, braking force accurate control and the like of the brake-by-wire system. As shown in fig. 1 and 2, the ball screw assembly of the brake system includes a nut 2 and a spiral race 2-2 provided on an inner diameter surface thereof, and an auxiliary structure 2-3 on an outer diameter surface thereof. The screw rod 1, a spiral raceway 1-1 corresponding to the spiral raceway of the nut and a plurality of balls 3 are arranged on the outer diameter surface of the screw rod 1, and the balls 3 are filled in a spiral rolling path formed by the two spiral raceways.
The ball screw assembly includes a ball circulation path for connecting balls from a start point and an end point of a rolling path to form an annular ball path. That is, when the ball moves in the ball rolling path and rotates around the screw shaft to reach the end point of the ball rolling path, the ball is carried up from one end portion of the ball circulation path, and returns from the other end portion of the ball circulation path to the start point of the ball rolling path. In this way, the balls rolling in the rolling path are circulated infinitely through the ball circulation path, so that the screw shaft and the nut can be continuously moved relatively.
The ball screw pair using the ball circulation path has various forms such as a guide tube type and a cover plate type, but the diameter of the outer diameter surface of the nut is increased, or other components cannot be integrated or freely mounted on the nut. Further, the ball screw assembly cannot be miniaturized and lightened. Therefore, the spiral rollaway nest in the nut is processed into a plurality of sections which do not interfere with each other, and then a section of transition curved surface groove 2-1 is processed to connect the spiral rollaway nest end to end, so that a plurality of sections of closed rollaway nest loops are formed, and the structure form of the ball screw pair commonly used in a linear control braking system is formed. The processing of the spiral raceway in the nut has formed a mature process route such as rough turning the spiral raceway, heat treatment and fine grinding the spiral raceway. The processing of the transition curved surface grooves connecting a row of spiral rollaway nest end to end is still a problem to be solved.
Patent application publication number CN102906457 a describes a method of processing a ball screw pair nut. The ball circulation path on the nut is formed by adopting a method for plastically deforming metal, but the ball circulation path needs to be processed before heat treatment, and after heat treatment, the ball circulation path has the conditions of heat treatment deformation and the like, which can lead to unsmooth ball circulation and abnormal noise, even jamming and the like of the ball screw pair.
Disclosure of Invention
The utility model aims to provide electrolytic machining equipment for a ball circulation path of a ball screw pair nut, which can solve the problems and can machine quenched workpieces with high machining precision.
According to the technical scheme provided by the utility model: the electrolytic machining device for the ball screw pair nut and ball circulation path comprises a horizontal workbench, wherein a horizontal movable workbench and a stand column are arranged on the horizontal workbench, a rotatable magnetic workbench is arranged on the horizontal movable workbench, a V-shaped positioning block is arranged on the rotatable magnetic workbench, the stand column is located on one side of the horizontal movable workbench, a vertical movable workbench is arranged on the stand column, and a cathode ball head is arranged on the vertical movable workbench.
As a further improvement of the utility model, the horizontal workbench is provided with a horizontal movable workbench through a horizontal driving mechanism, the horizontal driving mechanism comprises a horizontal driving motor and a ball screw pair which are arranged on the horizontal workbench, two sides of the ball screw pair are provided with horizontal guide rails, the horizontal movable workbench is slidingly arranged on the horizontal guide rails, the bottom of the horizontal movable workbench is connected with a ball screw pair nut, and the ball screw pair is driven by the horizontal driving motor.
As a further improvement of the utility model, the ball screw pair screw is rotatably arranged on the horizontal workbench through a ball screw pair rear end supporting bearing seat and a ball screw pair front end supporting bearing seat; an output shaft of the horizontal driving motor is connected with one end of a screw rod of the ball screw pair through a coupler.
As a further improvement of the present utility model, the rotatable magnetic table is rotatably mounted on the horizontally movable table and driven by a rotary motor.
As a further improvement of the present utility model, the rotatable magnetic table is rotatably mounted on the horizontally movable table by means of ball bearings; and is driven by the rotating electric machine through the second coupling.
As a further improvement of the utility model, a V-shaped positioning block is fixedly arranged on the rotatable magnetic workbench, the V-shaped positioning block is vertically arranged, and a V-shaped groove is positioned towards the cathode bulb.
As a further improvement of the utility model, the upright post is provided with the vertical movable workbench through the vertical driving mechanism, the vertical driving mechanism comprises a vertical driving motor and a vertical ball screw pair which are arranged on the upright post, two sides of the vertical ball screw pair are provided with vertical guide rails, the vertical movable workbench is arranged on the vertical guide rails in a sliding way, the bottom of the vertical movable workbench is connected with a nut of the vertical ball screw pair, and the vertical ball screw pair is driven by the vertical driving motor.
As a further improvement of the utility model, a vertical ball screw pair screw is vertically and rotatably arranged on the upright post through a ball screw pair rear end supporting bearing seat and a ball screw pair front end supporting bearing seat; an output shaft of the vertical driving motor is connected with one end of a screw rod of the vertical ball screw pair through a coupler.
As a further improvement of the utility model, the horizontal drive motor is a servo motor.
As a further development of the utility model, a plurality of rotatable magnetic work tables are arranged on the horizontal movable work table, and a plurality of adapted cathode bulb heads are arranged on the vertical movable work table.
The utility model can process complex curved surface structure of nut ball circulation path by electrochemical processing method, and can process multiple parts at one time. The processing method is not limited by the hardness of the material, can process the quenched workpiece, has high processing precision and good surface roughness, and the curved surface shape design of the ball circulation path is not limited by processing equipment and capability, so that the processing requirement of any curved surface can be met.
Drawings
Fig. 1 is a schematic view of a ball screw assembly.
Fig. 2 is a schematic view of a ball screw assembly nut.
Fig. 3 is a schematic view of a method for processing a nut ball circulation path according to the present utility model.
Fig. 4 is an enlarged view of the cathode head of the present utility model.
Fig. 5 is a schematic diagram of another embodiment of the present utility model.
FIG. 6 is a schematic view of a horizontal movable table according to the present utility model
FIG. 7 is a schematic view of a rotatable magnetic table according to the present utility model
1-7 comprise a screw shaft, 1-1 of screw shaft outer peripheral surface spiral rollaway nest, 2 of nut, 2-1 of nut inner peripheral surface ball circulation path, 2-2 of nut inner peripheral surface multiple independent spiral rollaway nest, 2-3: outer diameter surface auxiliary structure of nut, 3: multi-ball, 4: horizontal workstation, 5: the horizontal movable workbench comprises a rotatable magnetic workbench, a V-shaped positioning block, a cathode ball head, an electrolyte flow path, a vertical movable workbench, a vertical column, a horizontal driving motor, a horizontal guide rail, a bearing seat, a ball screw pair, a supporting bearing seat, a coupler, a rotating motor, a fixing screw, a second coupler, a ball bearing and the like, wherein the rotatable magnetic workbench is arranged at the front end of the ball screw pair, the rotary motor is arranged at the front end of the ball screw pair, the fixing screw is arranged at the rotary motor, and the second coupler is arranged at the front end of the ball screw pair, the ball bearing is arranged at the rotary motor, the fixing screw is arranged at the rotary motor, and the second coupler is arranged at the ball bearing.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the utility model herein. Furthermore, the terms "include" and "have," and the like, mean that other content not already listed may be "included" and "provided" in addition to those already listed in "include" and "provided; for example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements not expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model relates to electrolytic machining equipment for a ball screw pair nut and ball circulation path, which is combined with figures 2-7, and comprises a horizontal workbench 4, wherein a horizontal movable workbench 5 and a stand column 10 are arranged on the horizontal workbench 4, a rotatable magnetic workbench 6 is arranged on the horizontal movable workbench 5, a V-shaped positioning block 7 is arranged on the rotatable magnetic workbench 6, the stand column 10 is positioned on one side of the horizontal movable workbench 5, a vertical movable workbench 9 is arranged on the stand column 10, and a cathode ball head 8 is arranged on the vertical movable workbench 9.
As shown in fig. 5 and 6, the horizontal table 4 is provided with a horizontal movable table 5 by a horizontal driving mechanism, in this embodiment, the horizontal driving mechanism includes a horizontal driving motor 11 and a ball screw pair 14 which are mounted on the horizontal table 4, both sides of the ball screw pair 14 are provided with horizontal guide rails 12, the horizontal movable table 5 is slidingly mounted on the horizontal guide rails 12, the bottom of the horizontal movable table 5 is connected with a ball screw pair 14 nut, and the ball screw pair 14 is driven by the horizontal driving motor 11.
Specifically, the ball screw pair 14 is rotatably mounted on the horizontal table 4 through a ball screw pair rear end support bearing block and a ball screw pair front end support bearing block 15. An output shaft of the horizontal driving motor 11 is connected with one end of a screw rod of the ball screw pair 14 through a coupler 16.
The horizontal driving motor 11 drives the ball screw pair 14 to rotate, and the nut of the ball screw pair 14 drives the horizontal movable workbench 5 to horizontally move along the horizontal guide rail 12.
In other embodiments, the horizontal drive motor 11, the coupling 16, and the ball screw assembly 14 may be replaced with a horizontal drive cylinder. The horizontal driving cylinder body is fixedly arranged on the horizontal workbench 4, and the output end of the horizontal driving cylinder body is connected with the horizontal movable workbench 5.
The rotatable magnetic table 6 is rotatably mounted on the horizontal movable table 5 by means of two ball bearings 20 and is driven by a rotary motor 17 via a second coupling 19, enabling a rotational movement of the rotatable magnetic table 6.
The rotatable magnetic workbench 6 is fixedly provided with a V-shaped positioning block 7,V type positioning block 7 which is vertically arranged and positions the V-shaped groove towards the cathode bulb 8.
The moving principle of the vertical movable workbench 9 is the same as that of the horizontal movable workbench 5, the vertical column 10 is provided with the vertical movable workbench 9 through a vertical driving mechanism, in the embodiment, the vertical driving mechanism comprises a vertical driving motor and a vertical ball screw pair which are arranged on the vertical column 10, two sides of the vertical ball screw pair are provided with vertical guide rails, the vertical movable workbench 9 is slidably arranged on the vertical guide rails, the bottom of the vertical movable workbench 9 is connected with a vertical ball screw pair nut, and the vertical ball screw pair is driven by the vertical driving motor.
Specifically, the vertical ball screw pair screw is vertically rotatably mounted on the upright post 10 through a ball screw pair rear end supporting bearing seat and a ball screw pair front end supporting bearing seat. An output shaft of the vertical driving motor is connected with one end of a screw rod of the vertical ball screw pair through a coupler.
The vertical driving motor drives the vertical ball screw pair screw rod to rotate, and the vertical ball screw pair nut drives the vertical movable workbench 9 to move along the vertical guide rail in the height direction.
In other embodiments, the vertical drive motor, the coupling 16, and the vertical ball screw assembly may be replaced by a vertical drive cylinder. The vertical driving cylinder body is fixedly arranged on the upright post 10, and the output end of the vertical driving cylinder body is connected with the vertical movable workbench 9.
The horizontal driving motor 11, the rotating motor 17 and the vertical driving motor are all servo motors, and the displacement and the angle of the horizontal movable workbench 5, the vertical movable workbench 9 and the rotatable magnetic workbench 6 can be accurately controlled through the driving of the servo motors, so that the processing precision of products is ensured.
An electrolyte flow path is arranged in the cathode ball head 8, one end of the electrolyte flow path is connected with a liquid inlet pipe, and the other end of the electrolyte flow path faces the surface to be processed. The electrolyte may be supplied to the process field at a certain pressure and flow rate. The pressure and flow of the electrolyte are selected according to the actual requirements on machining efficiency, surface quality, dimensional accuracy and the like. In this patent, the pressure and flow rate of the electrolyte are not particularly described.
The cathode ball head 8 can be designed into a corresponding shape according to the curved surface shape of the nut ball circulation path, and can meet the processing requirements of various curved surface shapes. The nut can be designed to have a corresponding shape when the nut is machined at other positions and structures.
After finishing the processing of one ball circulation path of the nut 2, the rotatable magnetic workbench 6 can drive the nut 2 to rotate by a certain angle according to the requirement, and the vertically movable workbench 9 can drive the cathode head 8 to move by a certain distance along the vertical direction according to the requirement, so that the processing of the 2 nd ball circulation path is finished. The processing of a plurality of ball circulation paths can be completed by setting a control program in the electrochemical processing equipment and clamping at one time.
The method not only can process the nut ball circulation path, but also can design different shapes of the cathode ball head 6, and process other structures of the nut, such as holes, grooves, splines and the like.
As another embodiment of the present utility model, as shown in fig. 5, a plurality of rotatable magnetic force tables 6 may be arranged in a fixed arrangement on a horizontal movable table 5, and may be in a single row or n×n form. In this patent, the arrangement of fig. 4 is merely illustrative of one arrangement.
According to the rotatable magnetic force table 6 arranged on the horizontal movable table 5, a plurality of cathode bulbs 8 are arranged in a certain arrangement on the vertical movable table 9, the number and arrangement of which are the same as those of the rotatable magnetic force table 3. This embodiment makes it possible to machine not only a single nut at a time, but also a plurality of nuts at a time, depending on the number of rotatable magnetic tables 6 and cathode balls 8. The number of the rotatable magnetic force workbench 6 and the cathode ball head 8 can be determined according to the actual production line beat requirement, and finally the number of nuts to be processed is determined.
The processing method of the utility model comprises the following steps: the nut 2 to be processed is arranged on the rotatable magnetic workbench 6, the nut 2 to be processed is abutted against the V-shaped positioning block 7, and the nut is fixed by exciting the magnetic workbench 6. The cathode ball head 8 is driven by a vertical movable workbench 9, enters a ball circulation path part of the inner peripheral surface of the nut 2 to be processed, applies voltage between the cathode ball head 8 and the nut 2 to be processed, supplies electrolyte to a processing area along an electrolyte flow path according to certain pressure and flow, drives the magnetic workbench 3 and the nut 3 to be processed to rapidly move along a feeding direction by the horizontal movable workbench 2, moves the nut 2 to be processed to a proper gap with the cathode ball head 6, then feeds the nut according to a certain speed, and processes the nut ball circulation path to a required shape and size by using an electrochemical method.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present utility model, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the utility model, and are also considered to be within the scope of the utility model.
Claims (10)
1. The electrolytic machining device for the ball screw pair nut ball circulation path is characterized by comprising a horizontal workbench (4), wherein a horizontal movable workbench (5) and a stand column (10) are arranged on the horizontal workbench (4), a rotatable magnetic workbench (6) is arranged on the horizontal movable workbench (5), a V-shaped positioning block (7) is arranged on the rotatable magnetic workbench (6), the stand column (10) is positioned on one side of the horizontal movable workbench (5), a vertical movable workbench (9) is arranged on the stand column (10), and a cathode ball head (8) is arranged on the vertical movable workbench (9).
2. The ball screw pair nut ball circulation path electrolytic machining device according to claim 1, characterized in that the horizontal workbench (4) is provided with a horizontal movable workbench (5) through a horizontal driving mechanism, the horizontal driving mechanism comprises a horizontal driving motor (11) and a ball screw pair (14) which are arranged on the horizontal workbench (4), two sides of the ball screw pair (14) are provided with horizontal guide rails (12), the horizontal movable workbench (5) is slidingly arranged on the horizontal guide rails (12), the bottom of the horizontal movable workbench (5) is connected with a ball screw pair (14) nut, and the ball screw pair (14) is driven by the horizontal driving motor (11).
3. The ball screw pair nut ball circulation path electrolytic machining device according to claim 2, wherein the ball screw pair (14) screw is rotatably mounted on the horizontal table (4) through a ball screw pair rear end support bearing seat and a ball screw pair front end support bearing seat (15); an output shaft of the horizontal driving motor (11) is connected with one end of a screw rod of the ball screw pair (14) through a coupler (16).
4. The ball screw assembly nut ball circulation path electrochemical machining apparatus of claim 1, wherein the rotatable magnetic table (6) is rotatably mounted on the horizontally movable table (5) and driven by a rotary motor (17).
5. The ball screw set nut ball circulation path electrochemical machining apparatus of claim 4, wherein the rotatable magnetic table (6) is rotatably mounted on the horizontally movable table (5) by means of a ball bearing (20); and is driven by a rotating motor (17) through a second coupling (19).
6. The electrolytic machining device for the ball circulation path of the ball screw pair nut according to claim 1, wherein a V-shaped positioning block (7) is fixedly arranged on the rotatable magnetic workbench (6), and the V-shaped positioning block (7) is vertically arranged and positions a V-shaped groove towards the cathode ball head (8).
7. The ball screw pair nut ball circulation path electrolytic machining device according to claim 1, wherein the upright (10) is provided with a vertical movable workbench (9) through a vertical driving mechanism, the vertical driving mechanism comprises a vertical driving motor and a vertical ball screw pair which are arranged on the upright (10), two sides of the vertical ball screw pair are provided with vertical guide rails, the vertical movable workbench (9) is slidingly arranged on the vertical guide rails, the bottom of the vertical movable workbench (9) is connected with a vertical ball screw pair nut, and the vertical ball screw pair is driven by the vertical driving motor.
8. The ball screw pair nut ball circulation path electrolytic processing device according to claim 7, wherein the vertical ball screw pair screw is vertically rotatably mounted on the column (10) through a ball screw pair rear end support bearing housing and a ball screw pair front end support bearing housing; an output shaft of the vertical driving motor is connected with one end of a screw rod of the vertical ball screw pair through a coupler.
9. The ball screw pair nut ball circulation path electrolytic processing apparatus according to claim 2, wherein the horizontal driving motor (11) is a servo motor.
10. The ball screw assembly nut ball circulation path electrochemical machining device according to claim 4, characterized in that a plurality of rotatable magnetic force tables (6) are arranged on a horizontal movable table (5), and a plurality of adapted cathode balls (8) are arranged on a vertical movable table (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223172050.7U CN219665326U (en) | 2022-11-28 | 2022-11-28 | Electrolytic machining equipment for ball circulation path of ball screw pair nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223172050.7U CN219665326U (en) | 2022-11-28 | 2022-11-28 | Electrolytic machining equipment for ball circulation path of ball screw pair nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219665326U true CN219665326U (en) | 2023-09-12 |
Family
ID=87920155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223172050.7U Active CN219665326U (en) | 2022-11-28 | 2022-11-28 | Electrolytic machining equipment for ball circulation path of ball screw pair nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219665326U (en) |
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2022
- 2022-11-28 CN CN202223172050.7U patent/CN219665326U/en active Active
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