CN216228768U - Grinding wheel rod and grinding equipment - Google Patents
Grinding wheel rod and grinding equipment Download PDFInfo
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- CN216228768U CN216228768U CN202121790602.3U CN202121790602U CN216228768U CN 216228768 U CN216228768 U CN 216228768U CN 202121790602 U CN202121790602 U CN 202121790602U CN 216228768 U CN216228768 U CN 216228768U
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Abstract
The utility model provides a grinding wheel rod and grinding equipment, and relates to the field of grinding processing. The grinding part is provided with a first liquid through hole, the first liquid through hole extends towards the bottom surface of the grinding part, the depth of the first liquid through hole is smaller than the height of the grinding part, the first liquid through hole penetrates through the middle of the grinding surface, a second liquid through hole communicated with the first liquid through hole is formed in the edge area of the bottom surface of the grinding part, and the second liquid through hole can be used for introducing cooling liquid. Adopt this embodiment, when using the emery wheel stick to carry out abrasive machining, can externally spray the coolant liquid to second liquid through hole, the coolant liquid flows to first liquid through hole after getting into the second liquid through hole, flows out from the first liquid through hole in grinding face middle part again, gets into the central point that grinding face and machined part's machining area puts, and then realizes the synchronous cooling to grinding face and machining area, avoids the emery wheel stick to appear the burning sword phenomenon, prolongs the life of emery wheel stick.
Description
Technical Field
The utility model relates to the field of grinding processing, in particular to a grinding wheel rod and grinding equipment.
Background
The grinding wheel rod is a tool which is commonly used for processing materials such as ceramics, glass, stones, metals and the like. Generally, when a grinding wheel rod is used for grinding, a grinding surface at the top end of the grinding wheel rod and a product grinding area are heated due to high-speed friction, so that a cutter burning phenomenon is easy to occur, the grinding wheel rod is damaged, and meanwhile, the product processing quality is influenced. Therefore, it is necessary to spray a coolant between the grinding wheel bar and the product, but if the coolant is sprayed from the outside to the machining area, the coolant is thrown off by the grinding wheel bar rotating at a high speed, and it is difficult to enter the grinding area, and the cooling effect is not satisfactory.
SUMMERY OF THE UTILITY MODEL
The utility model provides a grinding wheel rod, which can realize synchronous cooling of a grinding surface of the grinding wheel rod and a product processing area from the center of a grinding area during grinding processing, and improve the cooling effect.
In order to achieve the above purpose, in a first aspect, the utility model adopts the following technical scheme:
a grinding wheel rod comprises
A rod body; and
the grinding portion, the grinding portion has relative grinding face and the bottom surface that sets up, first logical liquid hole has been seted up on the grinding face, first logical liquid hole is followed the grinding face to the direction of bottom surface extends, the bottom surface sets up on the barred body, the second logical liquid hole has been seted up to the bottom surface, the second logical liquid hole with first logical liquid hole intercommunication, just the axis in second logical liquid hole with the axis in first logical liquid hole forms the contained angle, the second logical liquid hole is used for letting in the coolant liquid so that the coolant liquid flows extremely first logical liquid hole.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, the second liquid through hole is multiple, and the multiple second liquid through holes are arranged at intervals along a center of the first liquid through hole.
As an alternative, in an embodiment of the first aspect of the present invention, the plurality of second liquid through holes are arranged at equal angular intervals inside the grinding portion.
As an alternative implementation manner, in the embodiment of the first aspect of the present invention, the grinding part and the rod body are of a columnar structure, and the outer diameter of the grinding part is larger than that of the rod body;
the bottom surface comprises a middle area connected with the rod body and an edge area connected with the middle area, the projection of the first liquid through hole on the bottom surface is located in the middle area, and the second liquid through hole is formed in the edge area.
As an alternative, in the first aspect of the present invention, the grinding portion is collinear with a central axis of the rod, and an axis of the first fluid passage hole is located on the central axis of the grinding portion.
In an alternative embodiment, in an embodiment of the first aspect of the present invention, a depth s of the first fluid passage hole in a direction from the grinding surface to the bottom surface is a height h of the grinding portion, and 0 < s ≦ 1/2 h.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, a protrusion is disposed on a side of the grinding portion facing away from the rod, the protrusion has the grinding surface, and a liquid discharge groove is further disposed on the grinding surface, and the liquid discharge groove is communicated with the first liquid through hole.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, the liquid discharge groove is located at a periphery of the first liquid through hole, and the liquid discharge groove penetrates through the protrusion.
As an alternative, in the first aspect of the present invention, the drain groove extends from the middle of the bump to the edge of the bump and penetrates through the edge of the bump.
In a second aspect, the present invention also provides a grinding apparatus comprising a grinding wheel bar as described in the first aspect above.
Compared with the prior art, the utility model has the following beneficial effects:
according to the grinding wheel rod provided by the utility model, the first liquid through hole is formed from the middle part of the grinding surface of the grinding wheel rod to the bottom surface of the grinding part, and the second liquid through hole which is communicated with the first liquid through hole and has an included angle between the axis and the axis of the first liquid through hole and used for introducing cooling liquid is formed from the bottom surface of the grinding part. Like this, when using the emery wheel stick to carry out abrasive machining, can follow emery wheel stick lateral surface and spray the coolant liquid to second through-flow hole, the coolant liquid flows to first through-flow hole from second through-flow hole, again from the first through-flow hole blowout of grinding face, thereby let the coolant liquid get into by the grinding face and the grinding regional cartridge space of machined part constitutes flows, and then realize the synchronous cooling to the grinding face of emery wheel stick and the grinding region of machined part, improve the cooling effect, avoid appearing the burning knife phenomenon, the life of extension emery wheel stick.
In addition, because first liquid through hole sets up in the middle part of grinding face, the coolant liquid can the middle part of grinding face, the regional central point of grinding of machined part puts to flowing around adding man-hour, and not only the cooling effect is good, still can in time wash the particulate matter that produces because of abrasive machining, and then can effectively solve abrasive machining and add the problem because of the wearing and tearing of sand grain powder, arouse the bad surface machining of machined part, improve the product yield of machined part.
Drawings
FIG. 1 is a schematic perspective view of a grinding wheel stick according to the present disclosure;
FIG. 2 is a side view of the grinding wheel stick disclosed in the present invention;
FIG. 3 is a front view of the disclosed grinding wheel bar along the bar body in the direction of the grinding section;
FIG. 4 is a front view of the grinding face of the grinding wheel bar disclosed herein;
fig. 5 is a block diagram of the structure of the grinding apparatus disclosed in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the utility model and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "opened," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a detachable link, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The technical solution of the present invention will be further explained with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, in a first aspect, the present invention provides a grinding wheel stick 100, which can be applied to a grinding apparatus 400 to grind a machining surface of a workpiece. Specifically, the grinding wheel stick 100 includes a stick body 10 and a grinding portion 20. The grinding part 20 has a grinding surface 210 and a bottom surface 22 opposite to each other, and the bottom surface 22 of the grinding part 20 is connected to one end of the rod 10. The grinding surface 210 is provided with a first liquid through hole 211, and the first liquid through hole 211 is located in the middle of the grinding surface 210 and extends along the direction from the grinding surface 210 to the bottom surface 22. The bottom surface 22 is provided with a second liquid through hole 220, the second liquid through hole 220 is communicated with the first liquid through hole 211, an included angle is formed between the axis of the second liquid through hole 220 and the axis of the first liquid through hole 211, and the second liquid through hole 220 is used for introducing cooling liquid so that the cooling liquid flows to the first liquid through hole 211.
It can be understood that, since the grinding wheel bar 100 is applied to the grinding apparatus 400, the other end of the bar body 10 can be used for being connected to the rotary joint 200 of the grinding apparatus 400 to rotate under the driving of the rotary joint 200, so that the bar body 10 can drive the grinding part 20 to rotate, thereby realizing the grinding of the processing surface of the workpiece by the grinding part 20.
According to the grinding wheel bar 100 disclosed by the embodiment of the utility model, the first liquid through hole 211 is formed in the middle of the grinding surface 210, the second liquid through hole 220 is formed in the bottom surface 22 of the grinding part 20, and the first liquid through hole 211 is communicated with the second liquid through hole 220, so that when the grinding wheel bar 100 is used for grinding, cooling liquid can be sprayed to the second liquid through hole 220 from the side of the bottom surface 22 of the grinding part 20, then the cooling liquid flows to the first liquid through hole 211 through the second liquid through hole 220, flows out from the first liquid through hole 211 in the middle of the grinding surface 210 and flows between the grinding surface 210 and a machining area of a workpiece, and therefore synchronous cooling of the grinding surface 210 of the grinding wheel bar 100 and the machining area of the workpiece is realized, the cooling effect of the grinding wheel bar 100 and the workpiece by the cooling liquid is favorably improved, the phenomenon of cutter burning is avoided, and the service life of the grinding wheel bar 100 is further prolonged.
It should be understood that the cooling liquid may be water, ethanol, or other cooling liquid, and the setting may be adjusted according to the actual processing situation, which is not limited in this embodiment.
In some embodiments, the rod 10 and the grinding portion 20 are both cylindrical rods, for example, cylindrical rods, and the central axes of the rod 10 and the grinding portion 20 are collinear, so that the grinding wheel rod 100 can stably rotate without swinging under the driving of the rotary joint. In addition, because first liquid through hole 211 sets up in the middle part of grinding face 210, the axis of first liquid through hole 211 and the axis collineation of barred body 10 and grinding portion 20, thereby when the coolant liquid flowed out from first liquid through hole 211, the coolant liquid can flow around from the middle part of grinding face 210, thereby can effectively improve the cooling effect to grinding face 210 and machined part, still in time wash the particulate matter that produces because of abrasive machining simultaneously, effectively solve the problem that the abrasive machining leads to arousing machined part surface to process badly because of the wearing and tearing of sand grain powder, effectively improve the product yield of machined part.
Further, the grinding portion 20 may be integrally formed at one end of the rod body 10, so that the machining process of the grinding wheel rod 100 may be simplified, and the machining of the grinding wheel rod may be facilitated. It is understood that in other embodiments, the grinding portion 20 may be provided separately from the rod 10, for example, the grinding portion 20 may be welded to one end of the rod 10 or bonded to one end of the rod 10.
Further, the outer diameter of the grinding part 20 may be larger than that of the rod body 10, so that the rod body 10 and the grinding part 20 may be clearly distinguished when grinding is performed using the grinding wheel bar 100, thereby accurately performing grinding using the grinding part 20.
Further, the bottom surface 22 of the grinding part 20 includes a central region 221 connected to the rod body and an edge region 222 connected to the central region 221, in which a projection of the first liquid passage hole 211 on the bottom surface is located, and the second liquid passage hole 220 is provided in the edge region.
In some embodiments, in order to make the grinding surface 210 of the grinding wheel stick 100 convex and facilitate the grinding of the workpiece by the grinding surface 210, a bump 21 is provided on the grinding portion 20, and the upper surface of the bump 21 is the grinding surface 210. In particular, the protrusion 21 may also be a cylindrical protrusion, and the outer diameter of the protrusion 21 may be slightly smaller than or equal to the outer diameter of the grinding portion 20. It is understood that the thickness of the bump 21 can be adjusted according to the specific requirements in practical situations, and the embodiment is not limited in this respect.
In some embodiments, the cross-sectional shape of the first liquid through hole 211 on a plane perpendicular to the central axis of the grinding portion 20 may be a circle, a regular triangle, a rectangle, or another regular polygon, that is, the first liquid through hole 211 may be a circular hole or a polygonal hole, as long as the cooling liquid can be introduced without affecting the stable operation of the grinding wheel bar 100, and this embodiment is not particularly limited thereto.
Further, the extending depth of the first liquid through hole 211 to the bottom surface 22 of the grinding part 20 can be adjusted according to actual conditions, the depth of the first liquid through hole 211 is s, the height of the grinding part 20 is h, 0 < s ≦ 1/2h, for example, s is 1/4h, 1/3h or 1/2 h.
In some embodiments, the cross-sectional shape of the second liquid through hole 220 on the plane perpendicular to the axis thereof may be a circle, a regular triangle, a rectangle, or another regular polygon, that is, the second liquid through hole 220 may be a circular hole or a polygonal hole as long as the second liquid through hole can be filled with the cooling liquid and does not affect the stable operation of the grinding wheel rod 100, which is not particularly limited in this embodiment.
Further, the depth of the second liquid through hole 220 may be adjusted according to actual conditions, as long as the second liquid through hole 220 communicates with the first liquid through hole 211, that is, the depth of the second liquid through hole 220 is smaller than the height of the grinding portion 20, and communicates with the first liquid through hole 211, and the cooling liquid may be introduced, which is not specifically limited in the embodiment of the present invention.
Further, the second liquid passing hole 220 should be a plurality of second liquid passing holes 220, and the plurality of second liquid passing holes 220 may be arranged at intervals along the central axis of the first liquid passing hole 211. The plurality of second through holes 220 may increase a flow path of the external coolant, and when the coolant is sprayed from the outside to the second through holes 220, the total amount of the coolant entering the grinding part 20 may be increased, thereby improving the cooling effect.
Alternatively, the second liquid passing holes 220 may be arranged at equal angular intervals in the grinding portion 20, in other words, the plurality of second liquid passing holes 220 are arranged in a ring shape with the axis of the first liquid passing hole 211. Thus, when the grinding wheel rod 100 is used for machining, the grinding wheel rod 100 rotating at a high speed is stressed stably, the phenomenon that the grinding wheel rod 100 swings due to high-speed rotation is avoided, the grinding wheel rod 100 can rotate stably for a long time, the safety of a machining worker during machining by using the grinding wheel rod 100 is guaranteed, and the situation that a machining effect of a workpiece is not ideal due to the instability of the grinding wheel rod 100 is avoided.
Optionally, the number of the second liquid through holes 220 may be 2, 3, 4 or more, and the second liquid through holes may be adjusted according to specific situations, which is not specifically limited in this embodiment.
For example, the number of the second liquid through holes 220 may be 2, the 2 second liquid through holes 220 are arranged in a straight line, and when the grinding wheel bar 100 is used for grinding, external coolant may enter the grinding portion 20 from the 2 second liquid through holes 220, flow to the first liquid through hole 211, and finally enter a space formed by the grinding surface 210 and the machining surface of the workpiece through the first liquid through hole 211 to achieve cooling.
In some embodiments, as shown in fig. 4, in order to further improve the cooling effect of the cooling liquid on the grinding surface 210 of the grinding wheel bar 100 and the machining area of the workpiece, a liquid discharge groove 212 may be provided on the grinding surface 210, and the liquid discharge groove 212 may be communicated with the first liquid through hole 211, so that the cooling liquid can flow from the first liquid through hole 211 to the liquid discharge groove 212, thereby effectively increasing the cooling area on the grinding surface 210 and the machining area of the workpiece and effectively improving the cooling effect.
Further, as described above, since the bump 21 has the grinding surface 210, when the drain groove 212 is formed in the grinding surface 210, the drain groove 212 is positioned on the outer periphery of the first liquid passing hole 211 and the drain groove 212 can pass through the bump 21, so that the depth of the drain groove 212 can be increased, the flow rate of the coolant in the drain groove 212 can be increased, and the cooling effect can be improved.
Further, the drain groove 212 may extend from the middle of the bump 21 to the edge of the bump 21 and penetrate the edge of the bump 21. Thus, when grinding is carried out, the cooling liquid flowing out from the first liquid through hole 211 can enter the liquid discharging groove 212, then overflows from the liquid discharging groove 212 along the edge of the liquid discharging groove 212, and flows into a space formed by the grinding surface 210 and the machining area, so that the whole grinding surface 210 and the whole machining area of a workpiece are synchronously cooled, and the utilization rate and the cooling efficiency of the cooling liquid are improved.
Further, the drain grooves 212 should be plural, and the plural drain grooves 212 may be disposed at intervals along the center of the first liquid passing hole 211, so that the plural drain grooves 212 may further increase the flow path of the cooling liquid, and improve the cooling effect.
Alternatively, the plurality of drainage grooves 212 may be arranged on the bump 21 at equal angular intervals, in other words, the plurality of drainage grooves 212 are arranged in a ring shape around the center of the first through hole 211. Thus, when the grinding wheel rod 100 is used for machining, the grinding wheel rod 100 rotating at a high speed is stressed stably, the phenomenon that the grinding wheel rod 100 swings due to high-speed rotation is avoided, the grinding wheel rod 100 can rotate stably for a long time, the safety of a machining worker during machining by using the grinding wheel rod 100 is guaranteed, and the situation that a machining effect of a machined part is not ideal due to the instability of the grinding wheel rod 100 is avoided.
Alternatively, the number of the drain grooves 212 may be 2, 3, 4 or more, and the setting may be adjusted according to the cooling condition, which is not particularly limited in this embodiment.
For example, the number of the drain grooves 212 may be 4, and the 4 drain grooves 212 are communicated with each other and form a cross-shaped arrangement on the grinding surface 210, so that the cooling liquid flowing out from the first liquid through hole 211 can flow to each drain groove 212, thereby enabling the cooling liquid to reach different areas of the grinding surface 210, effectively increasing the cooling area of the grinding surface 210 and the machining area of the workpiece, and effectively improving the cooling effect.
According to the grinding wheel stick 100 disclosed by the first aspect of the embodiment of the application, the grinding part 20 is arranged at one end of the stick body 10, the first liquid through hole 211 is formed in the middle of the grinding surface 210 of the grinding part 20, the second liquid through hole 220 is formed in the bottom surface 22 of the grinding part 20, the first liquid through hole 211 is communicated with the second liquid through hole 220, external cooling liquid can enter the grinding part 20 through the second liquid through hole 220 and flow to the first liquid through hole 211, and synchronous cooling of the grinding surface 210 of the grinding wheel stick 100 and the machining surface of a workpiece is achieved. In addition, in the embodiment of the present application, the liquid discharge groove 212 is further disposed on the grinding surface 210, and the liquid discharge groove 212 is communicated with the first liquid through hole 211, so that when the cooling liquid flows out from the first liquid through hole 211, the cooling liquid can enter the liquid discharge groove 212, and then flows and diffuses around the grinding surface 210 through the liquid discharge groove 212, and finally overflows from the liquid discharge groove 212, thereby increasing the cooling area of the cooling liquid on the grinding surface 210 and the processing surface of the workpiece, further improving the cooling effect of the cooling liquid, and meanwhile, when the cooling liquid flows around through the liquid discharge groove 212, the cooling liquid can also flush particulate matters and the like generated by grinding processing, and avoiding the problem of poor surface of the workpiece caused by abrasion of sand powder.
In a second aspect, embodiments of the present invention further provide a grinding apparatus 400, where the grinding apparatus 400 includes the grinding wheel bar 100 according to the first aspect of the embodiments. Specifically, the grinding apparatus 400 may include a rotary joint 200 and a driving mechanism 300, the driving mechanism 300 is connected to the rotary joint 200, and the rotary joint 200 may be connected to the other end of the grinding wheel rod 100, so that the rotary joint 200 may be driven by the driving mechanism 300 to rotate, and the rotary joint 200 may drive the grinding wheel rod 100 to integrally rotate, thereby grinding the processing surface of the workpiece.
It is understood that the drive mechanism 300 may be a rotary motor.
The grinding device 400 of the embodiment can effectively cool the workpiece and the grinding wheel rod 100 when grinding the workpiece, effectively avoid the phenomenon of cutter burning during grinding, and ensure the grinding quality of the workpiece.
The grinding wheel rod and the grinding device provided by the embodiment of the utility model are described in detail above, the principle and the embodiment of the utility model are explained in the present specification by applying specific examples, the description of the above embodiments is only used for helping to understand the idea of the utility model, and the content of the description should not be understood as the limitation of the utility model in the specific embodiment and the application range.
Claims (10)
1. The grinding wheel rod is characterized by comprising
A rod body; and
the grinding portion, the grinding portion has relative grinding face and the bottom surface that sets up, first logical liquid hole has been seted up on the grinding face, first logical liquid hole is followed the grinding face to the direction of bottom surface extends, the bottom surface sets up on the barred body, the second logical liquid hole has been seted up to the bottom surface, the second logical liquid hole with first logical liquid hole intercommunication, just the axis in second logical liquid hole with the axis in first logical liquid hole forms the contained angle, the second logical liquid hole is used for letting in the coolant liquid so that the coolant liquid flows extremely first logical liquid hole.
2. The grinding wheel bar according to claim 1, wherein the second liquid passage hole is provided in plurality, and the plurality of second liquid passage holes are arranged at intervals along the center of the first liquid passage hole.
3. The grinding wheel bar according to claim 2, wherein a plurality of said second through holes are arranged at equal angular intervals inside said grinding portion.
4. The grinding wheel bar according to claim 1, wherein the grinding portion and the bar body have a columnar structure, and the outer diameter of the grinding portion is larger than the outer diameter of the bar body;
the bottom surface comprises a middle area connected with the rod body and an edge area connected with the middle area, the projection of the first liquid through hole on the bottom surface is located in the middle area, and the second liquid through hole is formed in the edge area.
5. The grinding wheel bar of claim 4 wherein the grinding portion is collinear with a central axis of the body, the axis of the first fluid passage being located on the central axis of the grinding portion.
6. The grinding wheel bar according to claim 4, wherein the first fluid passage hole has a penetration depth s in a direction from the grinding surface toward the bottom surface, and the height of the grinding portion is h, and 0 < s ≦ 1/2 h.
7. The grinding wheel rod according to any one of claims 1 to 6, wherein a projection is provided on a side of the grinding portion facing away from the rod body, the projection has the grinding surface, and a liquid discharge groove is further provided on the grinding surface, and the liquid discharge groove is communicated with the liquid through hole.
8. The emery wheel stick of claim 7, wherein said drain groove is located at a periphery of said first fluid passage hole, and said drain groove penetrates said projection.
9. The emery wheel rod of claim 7, wherein the drain groove extends from a central portion of the boss toward and through an edge of the boss.
10. A grinding apparatus comprising a grinding wheel bar according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121790602.3U CN216228768U (en) | 2021-08-02 | 2021-08-02 | Grinding wheel rod and grinding equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121790602.3U CN216228768U (en) | 2021-08-02 | 2021-08-02 | Grinding wheel rod and grinding equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216228768U true CN216228768U (en) | 2022-04-08 |
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ID=80979433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121790602.3U Active CN216228768U (en) | 2021-08-02 | 2021-08-02 | Grinding wheel rod and grinding equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216228768U (en) |
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2021
- 2021-08-02 CN CN202121790602.3U patent/CN216228768U/en active Active
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