The present invention relates to the field of grinding wheel tool technologies, and in particular, to an electroplated steel wire segment-combined grinding wheel.
Usually, only a few water passing grooves are machined in the base of an existing electroplated grinding wheel, because the processing cost increases along with the increased number of the water passing grooves. For a grinding wheel electroplated with diamonds, a few strip-shaped regions in the grinding wheel are not electroplated with the diamonds to form water passing grooves. However, these water passing grooves have small space, producing limited effect. The cooling effect of both the above externally cooled grinding wheels, is affected by the diamond particle size: the smaller the diamond particle size is, the smaller a water-passing and chip-accommodating space is, and the worse the cooling effect is.
At present, a combined grinding wheel is formed by combining a plurality of thin single-segmented sheets. In a single-segment machining process, a powder metallurgy process is used: the single segment is molded from an abrasive embedded in a metal bonding agent by hot-pressing and sintering with a mold. In such structural design, water channels are formed among the single-segmented sheets of the grinding wheel, and are densely distributed. The single-segmented sheets are combined to form the grinding wheel, so that the grinding wheel has the effects of rapid chip removal and rapid cooling. The cooling effect is greatly improved as internal cooling is realized. However, there is no similar structural design for the electroplated grinding wheel at present; and it is difficult for a cooling and chip removal method adopted by an existing electroplated grinding wheel to achieve the effect achieved by the grinding wheel formed by combining thin single-segmented sheets. In addition, if water grooves are densely machined in the base, the cost is extremely high, causing poor cost performance. If dense strip-shaped regions are shielded from being plated with the diamonds, a manufacturing process is cumbersome and difficult.
A technical problem to be solved by the present invention is to provide an electroplated steel wire segment-combined grinding wheel for defects in the prior art.
The present invention adopts the following technical solution to solve the above technical problem. An electroplated steel wire segment-combined grinding wheel includes a base component for connecting an external device, and a plurality of steel wire segments, wherein the steel wire segments are combined and assembled on the base component in a ring, and outer walls of the steel wire segments are plated with diamonds to form a grinding surface.
The present invention has the benefits as follows. The steel wire segments are combined and assembled mechanically on a support base, the base is a reusable tool and can be reused, and it is convenient to replace the grinding surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced. For the steel wire segment-combined grinding wheel, spaces between the segments and segment arcs and spaces formed by exposed diamond particles naturally form drainage channels between the segments and the segment arcs, and thus internally cooled type cooling and rapid chip removal are facilitated.
Based on the above technical solution, the present invention can also be improved as follows.
Further, the electroplated steel wire segment-combined grinding wheel further includes a first support ring for supporting the steel wire segments, and a fixing part for fixing the first support ring, wherein the base component includes a first base; the fixing part is disposed opposite to the first base, and the first support ring is held between the fixing part and the first base; and the steel wire segments are arranged on the outer wall of the first support ring.
Further, the first base is of a circular disc structure, the fixing part includes a first pressure plate of an annular disc structure, and the first support ring has an annular groove structure; the first pressure plate is disposed coaxially opposite to the first base;
a groove bottom of the first support ring is disposed outward and parallel to the central axis of the first base, a groove opening of the first support ring is disposed inward, one end of the groove opening of the first support ring is abutted against the outer edge of the first base, and the other end of the groove opening of the first support ring is abutted against the outer edge of the first pressure plate; a cavity is formed among the first base, the first support ring and the first pressure plate; and the steel wire segment is bent to have a U shape and bonded to the outer wall of the groove bottom of the first support ring, one end of the steel wire segment is clamped into a slit between the first base and one end of the groove opening of the first support ring, the other end of the steel wire segment is clamped into a slit between the first pressure plate and the other end of the groove opening of the first support ring, and the plurality of steel wire segments is arranged circumferentially in parallel.
With the adoption of the above further solution, the following benefit is achieved: the steel wire segments are combined and assembled mechanically on a support base, the base is a reusable tool and can be reused, and it is convenient to replace a working surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced.
Further, the base component includes a second base; the electroplated steel wire segment-combined grinding wheel further includes a second support ring for supporting the plurality of steel wire segments, a third base for fixing the second support ring onto the second base, and a holding part for tightly holding the steel wire segments; the third base is stacked on one side of the second base, and the holding part and the second support ring are disposed on the third base in parallel; and the steel wire segments are arranged on the second support ring and are plated with diamonds to form the grinding surface, and one end of the steel wire segment is clamped into a slit between the holding part and the second support ring.
With the adoption of the above further solution, the following benefits are achieved. The steel wire segments are combined and assembled mechanically on the support ring, the base is a reusable tool and can be reused, and it is convenient to replace the grinding surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced. For the steel wire segment-combined grinding wheel, an axial working surface is formed and a large number of dense water channels are naturally formed between the segments and segment arcs, so that internally cooled type cooling and rapid chip removal are facilitated.
Further, the holding part includes a second pressure plate, the second base is of a circular disc structure, and each of the third base, the second pressure plate and the second support ring takes the shape of a ring-shaped disc; the third base is coaxial with the second base, and stacked on the outer edge of the second base; the second pressure plate and the second support ring are coaxial with the second base and are disposed on the third base in parallel from inside to outside, and the axial length of the second support ring is greater than the axial length of the second pressure plate; and the plurality of the steel wire segments is arranged in a ring, and are bonded onto inner and outer side walls of the second support ring and a side wall, away from the third base, of the second support ring in a bent manner.
With the adoption of the above further solution, the following benefits are achieved. The steel wire segments are combined and assembled mechanically on the support ring to form an annular grinding surface; one ends of the steel wire segments are clamped and stably fixed between the second pressure plate and the holding part to prevent the steel wire segments from becoming loose; and the steel wire segments are mounted in a clamping manner, so that it is convenient to replace the all or part of the grinding working surface, and the base is reusable, thereby prolong the service life of the grinding wheel.
In the accompanying drawings, a list of components represented by respective reference signs is as follows:
1, steel wire segment; 2, first support ring; 3, fixing part; 4, first base; 5, pressure disc; 6, support plate; 7, support block; 8, protruding point; 201, water groove outlet; 301, first pressure plate; 302, second annular step; 303, fixing screw; 304, threaded hole; 305, mounting hole; 306, mounting block; 401, first annular step; 501, pressure disc screw; 601, support frame screw; 602, first clamping groove;
9, second base; 10, second support ring; 11, third base; 12, holding part; 13, holding part screw; 14, support ring screw; 15, base screw; 1001, second clamping groove; 1101, first positioning ring; 1102, second positioning ring; 1201, second pressure plate; and 1202, aluminum wire ring,
The principle and features of the present invention are described below with reference to the accompanying drawings and examples are given only for explaining the present invention and are not intended to limit the scope of the present invention.
Embodiment 1: as shown in
In the above embodiment, the steel wire segments 1 are combined and assembled mechanically on the support base, the base is a reusable tool and can be reused, and it is convenient to replace the grinding surface combined by the steel wire segments 1, so that the renovation cost of the grinding wheel is greatly reduced. For the steel wire segment-combined (peripheral) grinding wheel, drainage channels are naturally formed between the segments and segment arcs, and thus, internally cooled type cooling and rapid chip removal are facilitated.
On the basis of Embodiment 1, Embodiment 2 provides a first grinding wheel according to the present invention. The electroplated steel wire segment-combined grinding wheel further includes a first support ring 2 for supporting the steel wire segments 1, and a fixing part 3 for fixing the first support ring 2. The base component includes a first base 4. The fixing part 3 is disposed opposite to the first base 4, and the first support ring 2 is held between the fixing part 3 and the first base 4. The steel wire segments 1 are arranged on the outer wall of the first support ring 2.
On the basis of Embodiment 2, Embodiment 3 is as follows. As shown in
A groove bottom of the first support ring 2 is disposed outward and parallel to the central axis of the first base 4; a groove opening of the first support ring 2 is disposed inward; and one end of the groove opening of the first support ring 2 is abutted against the outer edge of the first base 4, and the other end of the groove opening of the first support ring 2 is abutted against the outer edge of the first pressure plate 301. A cavity is formed among the first base 4, the first support ring 2 and the first pressure plate 301. The steel wire segment 1 is bent to have a U shape and bonded to the outer wall of the groove bottom of the first support ring 2; one end of the steel wire segment 1 is clamped into a slit between the first base 4 and one end of the groove opening of the first support ring 2; and the other end of the steel wire segment 4 is clamped into a slit between the first pressure plate 301 and the other end of the groove opening of the first support ring 2. The steel wire segments 1 are arranged circumferentially in parallel.
Preferably, the outer diameter of the first pressure plate 301 is equal to the outer diameter of the first base 4.
In the above embodiment, the steel wire segments are combined and assembled mechanically on the first base which supports the steel wire segments, the first base 4 is a reusable tool and can be reused, and it is convenient to replace the grinding surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced.
On the basis of Embodiment 3, Embodiment 4 is as follows. As shown in
In the above embodiment, through the first annular step 401 and the second annular step 302, the first base 4, the first pressure plate 301 and the first support ring 2 can be rapidly positioned, so that the (peripheral) grinding wheel structure is quickly combined. In addition, the two ends of each steel wire segment 1 are quickly clamped between the support ring 4 and the base 1 as well as between the support ring 4 and the pressure plate 301 respectively, so that a working surface combined by the steel wire segments can be replaced conveniently, thereby greatly reducing the renovation cost of the grinding wheel.
On the basis of Embodiment 4, Embodiment 5 is as follows. As shown in
The opening of each of the water groove outlets 201 at the edges of two ends of the groove opening of the first support ring 2 extends obliquely along a rotation direction of the first base 4. For the opening of each of the water groove outlets 201 at the groove bottom, by taking the middle as a reference, the end of the opening in proximity the fixing part 3 extends obliquely along the rotation direction of the first base 4, and the other end of the opening in proximity the first base 4 extends obliquely along the direction opposite to the rotation direction.
In the above embodiment, the water groove outlets 201 can form grid-like water channels between the segments and segment arcs of the steel wire segments, which is more conducive to precision grinding with a small cutting depth and ensures that the grinding wheel is supplied with cooling water in a grinding region (a region where a workpiece is in contact with the grinding wheel) at any moment, so that internally cooled type cooling is achieved, and the cooling and chip removal capacities are greatly improved.
On the basis of Embodiment 3, Embodiment 6 is as follows. As shown in
In the above embodiment, the first support ring 2 can be firmly combined on the first base 4.
As shown in
Specifically, the steel wire segment 1 may be stamped from a thin steel plate having a thickness of 0.1-2 mm.
In the above embodiment, arcuate grooves are naturally formed between the segments and segment arcs of the steel wire segments with circular sections, i.e., cylindrical steel wire segments, to form drainage channels, so that internally cooled type cooling and rapid chip removal are facilitated. An arcuate corner of the grinding surface forms a natural grinding corner, so that the vibration generated when a grinding tool works on a workpiece is reduced, thereby greatly facilitating low-impact grinding. The steel wire segments 1 are shaped by bending. Compared with the process of electroplating the base with diamonds in the prior art, the process of electroplating the steel wire segments with the diamonds can realize mass production simply, which is more conducive to automatic and large-scale production. The steel wire segments with rectangular cross sections, i.e., the sheet-shaped steel wire segments, can be manufactured by a stamping method similar to that of the cylindrical steel wire segments 1. During the manufacturing, the surfaces of the sheet-shaped steel wire segments are plated with the diamonds through an electroplating process to form thin segmented sheets, and the thin segmented sheets are combined to form a grinding wheel with the surface electroplated with single layer of the diamonds, thereby realizing the same effect as that of the cylindrical steel wire segments-combined wheel.
On the basis of Embodiment 4, Embodiment 7 is as follows. As shown in
In the above embodiment, as the protruding points 8 are clamped into corresponding wave-shaped clamping grooves in the first base 4 and the first pressure plate 301, the steel wire segments 1 can be stably fixed and are prevented from being deviated.
Optionally, as shown in
In the above embodiment, drainage channels are naturally formed between segments and arcs of the steel wire segments 1, so that internally cooled type cooling and rapid chip removal are facilitated.
On the basis of Embodiment 7, Embodiment 8 is as follows. As shown in
In the above embodiment, the wave-shaped steel wire segments 1 can increase drainage channels, which is more conducive to cooling and rapid chip removal without affecting grinding.
On the basis of Embodiment 2, Embodiment 9 provides a second grinding wheel according to the present invention. As shown in
In the above embodiment, in the case that the steel wire segments 1 have relatively high rigidity, the steel wire segments are combined and assembled mechanically on the support base without support by the other support components. The base is a reusable tool and can be reused, and it is convenient to replace the working surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced.
On the basis of Embodiment 9, Embodiment 10 is as follows. As shown in
The support plate 6 is ring-shaped, the plurality of support plates 6 is axially disposed at intervals, and first clamping grooves 602 for clamping of the steel wire segments 1 are formed in the outer edge of the support plate 6 in a ring. The steel wire segment 1 is clamped into the first clamping groove 602. The support plate 6 close to the pressure disc 5 is supported on the pressure disc 5 through the plurality of support blocks 7, and the plurality of support blocks 7 is supported between adjacent support plates 6. The support blocks 7 in each layer are circumferentially disposed at intervals, and the positions of the support blocks 7 in adjacent layers are the same. The support frame screws 601 correspond to the support blocks 7 on various layers respectively, and successively run through the respective support blocks 7 at the same positions from the topmost support plate 6 to be in threaded connection with screw holes in the pressure disc 5.
In the above embodiment, in the case that the steel wire segments have relatively low rigidity, the steel wire segments 4 are combined and assembled mechanically on the first base used for supporting, and are supported by the support frame, the first base is a reusable tool and can be reused, and it is convenient to replace the working surface combined by the steel wire segments 1, so that the renovation cost of the grinding wheel is greatly reduced.
Optionally, as shown in
In the above embodiment, as the protruding points 8 are clamped into corresponding wave-shaped clamping grooves in the first pressure disc 301, the steel wire segments 1 can be stably fixed and are prevented from being deviated.
On the basis of embodiment 10, Embodiment 11 is as follows. One end, parallel to the central axis, of the steel wire segment 1 takes the shape of a straight strip or is axially bent to have a segment shape.
A machining groove for grinding and machining a glass article is formed in the middle of the straight-striped end of the steel wire segment 1.
The machining groove in the steel wire segment 1 is acquired by machining. Specifically, the steel wire segments are assembled in a ring and the assembled wire segments 1 are machined to acquire the machining grooves in a ring.
In the above embodiment, the steel wire segments 1 of different forms can be selected according to machining demands so as to adapt to variety of grinding.
On the basis of Embodiments 1-11, Embodiment 12 is as follows. As shown in
Specifically, the steel wire segment 1 may be stamped from a thin steel plate having a thickness of 0.1-2 mm.
In the above embodiment, arcuate grooves are naturally formed between the segments and segment arcs of the steel wire segments with circular sections, i.e., cylindrical steel wire segments, to form drainage channels, so that internally cooled type cooling and rapid chip removal are facilitated. An arcuate corner of the grinding surface forms a natural grinding corner, so that the vibration generated when a grinding tool works on a workpiece is reduced, thereby greatly facilitating low-impact grinding. The steel wire segments 1 are shaped by bending. Compared with the process of electroplating the base with diamonds in the prior art, the process of electroplating the steel wire segments with the diamonds can realize mass production simply, which is more conducive to automatic and large-scale production. The steel wire segments with rectangular cross sections, i.e., the sheet-shaped steel wire segments, can be manufactured by a stamping method similar to that of the cylindrical steel wire segments 1. During the manufacturing, the surfaces of the sheet-shaped steel wire segments are plated with the diamonds through an electroplating process to form thin segmented sheets, and the thin segmented sheets are combined to form a grinding wheel with the surface electroplated with single layer of diamonds, thereby realizing the same effect as that of the cylindrical steel wire segments-combined wheel.
On the basis of Embodiments 1 to 12, a device mounting hole for connecting the external device may further be formed in the center of the first base 4.
The first grinding wheel and the second grinding wheel according to the present invention have the advantages as follows.
1. The steel wire segments are cylindrical, and the arcuate corner of the grinding surface forms the natural grinding corner, so that the vibration generated when a grinding tool works on a workpiece is reduced, thereby greatly facilitating low-impact grinding.
2. For the steel wire segment-combined grinding wheel, drainage channels are naturally formed between the segments and segment arcs, so that internally cooled type cooling and rapid chip removal are facilitated.
3. The steel wire segments are combined and assembled mechanically on the support base, the base is a reusable tool and can be reused, and it is convenient to replace the working surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced.
4. The steel wire segments are bent to have a required shape. Compared with the process of electroplating the base with diamonds in the prior art, the process of electroplating the steel wire segments with the diamonds can realize mass production simply, which is more conducive to automatic and large-scale production.
5. The sheet-shaped steel wire segments can be manufactured by a stamping method similar to that of the cylindrical steel wire segments 1. During the manufacturing, the surfaces of the sheet-shaped steel wire segments are plated with diamonds through an electroplating process to form thin segmented sheets, and the thin segmented sheets are combined to form a grinding wheel with the surface electroplated with single layer of the diamonds, thereby realizing the same effect as that of the cylindrical steel wire segments-combined wheel.
6. The sheet-shaped steel wire segments are stamped from a steel sheet and thus are more economic.
7. The above technical principles are suitable for peripheral grinding tools, such as grinding wheels of various diameters and small grinding heads.
On the basis of Embodiment 1, Embodiment 13 provides a third grinding wheel according to the present invention. As shown in
It should be understood that after being assembled, the steel wire segments 1 are plated with the diamonds.
In the above embodiment, the steel wire segments are combined and assembled mechanically on the support ring, the base is a reusable tool and can be reused, and it is convenient to replace the grinding surface combined by the steel wire segments 1, so that the renovation cost of the grinding wheel is greatly reduced. For the steel wire segment-combined (cup-shaped) grinding wheel, an axial working surface is formed and drainage channels are naturally formed between the segments and segment arcs, so that internally cooled type cooling and rapid chip removal are facilitated.
On the basis of Embodiment 13, Embodiment 14 is as follows. As shown in
In the above embodiment, the steel wire segments 1 are combined and assembled mechanically on the second support ring 10 to form an annular grinding surface; one ends of the steel wire segments 1 are tightly held and stably fixed between the second pressure plate 1201 and the holding part 12 to prevent the steel wire segments 1 from becoming loose. The steel wire segments 1 are mounted in a clamping manner, so that it is convenient to replace the all or part of the grinding working surface, and the base is reusable. Thus, the service life of the grinding wheel is prolonged.
On the basis of Embodiment 14, Embodiment 15 is as follows. As shown in
In the above embodiment, the holding part 12 can be rapidly positioned on the second base 9 through the first positioning ring 1101, and the first positioning ring 1101 is stably fixed to prevent displacement during working.
On the basis of Embodiment 14, Embodiment 16 is as follows. A second positioning ring 1102 protruding axially is disposed in a ring at the position, corresponding to the outer edge, on the third base 11. An annular notch is formed in the outer edge of the second support ring 10 in a ring; and the second positioning ring 1102 of the third base 11 is embedded in the annular notch.
Specifically, a plurality of circular holes for mounting of screws is formed in corresponding positions of each of the second base 9 and the third base 11.
As shown in
In the above embodiment, the holding part 12 can be rapidly positioned on the third base 11 through the second positioning ring 1102, and the second positioning ring 1102 is stably fixed to prevent displacement during working.
On the basis of Embodiment 16, Embodiment 17 is as follows. As shown in
In the above embodiment, the two ends of each steel wire segment 1 are clamped to prevent the steel wire segments from being dropped when the base moves rapidly.
On the basis of Embodiment 14, Embodiment 18 is as follows. As shown in
In the above embodiment, with the aluminum wire rings 1202, the slits between the holding part 12 and the second support ring 10 are smaller, thereby preventing the steel wire segments 1 from becoming loose.
On the basis of Embodiment 14, Embodiment 19 is as follows. As shown in
Specifically, the holding part screws 13 are disposed forward, namely, from top to bottom; and the support ring screws 14 and the base screws 15 are disposed reversely, namely, from bottom to top.
In the above embodiment, through the plurality of holding part screws 13, the plurality of support ring screws 14 and the plurality of base screws 15, the second base 9, the third base 11, the holding part 12 and the second support ring 10 can be fixed to one another and are prevented from becoming loose when the whole (cup-shaped) grinding wheel works.
On the basis of Embodiment 14, Embodiment 20 is as follows. As shown in
In the above embodiment, the steel wire segments 1 can be rapidly clamped onto the corresponding positions on the second support ring 10 and are prevented from being displaced.
On the basis of Embodiments 13-20, Embodiment 21 is as follows. As shown in
On the basis of Embodiment 21, Embodiment 22 is as follows. As shown in
The thickness of the thin steel plate is 0.1-2 mm.
In the above embodiment, drainage channels are naturally formed between the segments and segment arcs of the steel wire segments with circular sections, i.e., cylindrical steel wire segments, so that internally cooled type cooling and rapid chip removal are facilitated. An arcuate corner of the grinding surface forms a natural grinding corner, so that the vibration generated when a grinding tool works on a workpiece is reduced, thereby greatly facilitating low-impact grinding. The steel wire segments are shaped by bending. Compared with the process of electroplating the base with diamonds in the prior art, the process of electroplating the steel wire segments with the diamonds can realize mass production simply, which is more conducive to automatic and large-scale production. The steel wire segments with rectangular cross sections, i.e., the sheet-shaped steel wire segments, can be manufactured by a stamping method similar to that of the cylindrical steel wire segments. During the manufacturing, the surface of a sheet-shaped base is plated with diamonds through an electroplating process to form thin segmented sheets, and the thin segmented sheets are combined to form a grinding wheel with the surface electroplated with single layer of the diamonds, thereby realizing the same effect as that of the cylindrical steel wire segments-combined wheel.
The third grinding wheel according to the present invention has the advantages as follows.
1. The steel wire segments are cylindrical, and the arcuate corner of the grinding surface forms the natural grinding corner, so that the vibration generated when a grinding tool works on a workpiece is reduced, thereby greatly facilitating low-impact grinding.
2. For the steel wire segment-combined grinding wheel, arcuate grooves are naturally formed between the segments and segment arcs to form a large number of dense drainage channels, so that internally cooled type cooling and rapid chip removal are facilitated.
3. The steel wire segments are combined and assembled mechanically on the support base, the base is a reusable tool and can be reused, and it is convenient to replace the working surface combined by the steel wire segments, so that the renovation cost of the grinding wheel is greatly reduced.
4. The steel wire segments are bent to have a required shape. Compared with the process of electroplating the base with diamonds in the prior art, the process of electroplating the steel wire segments with the diamonds can realize mass production simply, which is more conducive to automatic and large-scale production.
5. The sheet-shaped steel wire segments can be manufactured by a stamping method similar to that of the cylindrical steel wire segments. During the manufacturing, the surfaces of the sheet-shaped steel wire segments are plated with diamonds through an electroplating process to form thin segmented sheets, and the thin segmented sheets are combined to form a grinding wheel with the surface electroplated with single layer of the diamonds, thereby realizing the same effect as that of the cylindrical steel wire segments-combined wheel.
6. The sheet-shaped rectangular steel wire segments can be made from the thin steel plate by a stamping method similar to that of the cylindrical steel wire segments. During the manufacturing, the surfaces of the sheet-shaped steel wire segments are plated with diamonds through an electroplating process to form thin segmented sheets, and the thin segmented sheets are combined to form a grinding wheel with the surface electroplated with single layer of the diamonds, thereby realizing the same effect as that of the cylindrical steel wire segments-combined wheel.
The above description is only preferred embodiments of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements and the like made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Number | Date | Country | Kind |
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202010031550.5 | Jan 2020 | CN | national |
202010032109.9 | Jan 2020 | CN | national |
202020061554.3 | Jan 2020 | CN | national |
202020062307.5 | Jan 2020 | CN | national |
This application is the national stage entry of International Application No. PCT/CN2020/140143, filed on Dec. 28, 2020, which is based upon and claims priority to Chinese Patent Application No. 202010031550.5 filed on Jan. 13, 2020; Chinese Patent Application No. 202020061554.3 filed on Jan. 13, 2020; Chinese Patent Application No. 202010032109.9 filed on Jan. 13, 2020; and Chinese Patent Application No. 202020062307.5 filed on Jan. 13, 2020, the entire contents of which are incorporated herein by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/CN2020/140143 | 12/28/2020 | WO |