CN110821949A - Damping rotating shaft - Google Patents
Damping rotating shaft Download PDFInfo
- Publication number
- CN110821949A CN110821949A CN201911175479.1A CN201911175479A CN110821949A CN 110821949 A CN110821949 A CN 110821949A CN 201911175479 A CN201911175479 A CN 201911175479A CN 110821949 A CN110821949 A CN 110821949A
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- CN
- China
- Prior art keywords
- rotating shaft
- elastic block
- seat
- mounting hole
- arc surface
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/045—Pivotal connections with at least a pair of arms pivoting relatively to at least one other arm, all arms being mounted on one pin
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C11/00—Pivots; Pivotal connections
- F16C11/04—Pivotal connections
- F16C11/12—Pivotal connections incorporating flexible connections, e.g. leaf springs
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The invention provides a damping rotating shaft, comprising: the rotating shaft, the elastic block, the rotating body and the mechanism seat are arranged on the rotating shaft; the mechanism seat comprises a fixed seat and a rotating shaft seat; an elastic block mounting space is formed in the rotating shaft seat and used for mounting the elastic block; the free height of the arc surface at the upper end of the elastic block is greater than the height between the arc surface at the lower end of the rotating body and the fixed seat; the lower part of the rotating body is provided with a rotating shaft mounting hole; the rotating shaft sequentially passes through the left rotating shaft mounting hole of the rotating shaft seat, the rotating shaft mounting hole of the rotating body and the right rotating shaft mounting hole of the rotating shaft seat; when the locking screws at the two ends of the rotating shaft seat are screwed, the elastic block is extruded and deformed between the lower end arc end surface of the rotating body and the fixed seat, and friction force is generated between the upper end arc surface of the elastic block and the lower end arc surface of the rotating body, and the characteristic is damping force when the rotating body rotates. The invention realizes the damping effect of the rotating shaft by pressing the elastic block between the arc surface of the rotating body and the fixed seat, and has the advantages of simple structure, low cost and small required space.
Description
Technical Field
The invention belongs to the technical field of design of rotating shafts, and particularly relates to a damping rotating shaft.
Background
The damping rotating shaft is a device which enables two parts to rotate relatively and be positioned at any angle through friction force. When one of the rotating parts is rotated to any angle and is suspended, the rotating part is manually pushed to have damping hand feeling. Damped shafts are common in everyday applications.
At present, the common damping rotating shaft needs a large installation space and high customization requirement degree, and the assembly of the components is complex, so that the application and popularization of the damping rotating shaft are restricted. Some researches improve common damping rotating shafts, but the improved damping rotating shafts are only suitable for the scene that the area of the end face of the rotating body perpendicular to the rotating shaft direction is sufficient and the compression screws are conveniently installed on the end face. When the area size of the end surface of the rotating body perpendicular to the direction of the rotating shaft is limited, a screw cannot be mounted on the end surface, and thus the application of the damping rotating shaft is limited.
In summary, the conventional damping rotating shaft requires a large installation space and is complex to assemble, which results in low universality of the damping rotating shaft.
Disclosure of Invention
In order to overcome the problems of the existing damping rotating shaft that a large installation space is required, the assembly is complex, the universality is low, or at least to partially solve the problems, embodiments of the present invention provide a damping rotating shaft.
The embodiment of the invention provides a damping rotating shaft which comprises a rotating shaft 3, an elastic block 5, a rotating body 6 and a mechanism seat 7;
the mechanism seat 7 comprises a fixed seat 1 and a rotating shaft seat 2, and the positions of the rotating shaft seat 2 and the fixed seat 1 are relatively fixed;
an elastic block installation space 2-D is formed in the rotating shaft seat 2, and the elastic block 5 is arranged in the elastic block installation space 2-D;
the left side and the right side of the elastic block mounting space 2-D are respectively provided with a left rotating shaft mounting hole 2-B and a right rotating shaft mounting hole 2-C;
a rotating shaft mounting hole 6-B is formed in the lower part of the rotating body 6;
the rotating shaft 3 sequentially penetrates through the left rotating shaft mounting hole 2-B of the rotating shaft seat 2, the rotating shaft mounting hole 6-B of the rotating body 6 and the right rotating shaft mounting hole 2-C of the rotating shaft seat 2. The height L1 of the upper end arc surface 5-A of the elastic block 5 when not compressed and deformed is larger than the height L2 from the lower end arc surface 6-A of the rotating body 6 to the fixed seat 1.
When the rotating shaft seat 2 is fixed on the fixed seat 1 by the screw 4, the elastic block 5 is extruded by the rotating body 6 and the fixed seat 1 to generate elastic deformation;
when the rotating body 6 rotates, a friction force is generated between the upper end arc surface 5-A of the elastic block 5 and the lower end arc surface 6-A of the rotating body 6.
The upper end surface of the elastic block 5 contacting with the rotating body 6 is set to be a circular arc surface, so that the contact area between the elastic block and the rotating body can be increased, and the friction force when the rotating body rotates is increased.
The material hardness of the elastic block 5 is lower than that of the rotator, so that the rotator cannot be worn obviously during rotation, and when the elastic block 5 is compressed and deformed, the compression deformation amount (L1-L2)/L1 during operation of the elastic block 5 is smaller than the compression allowance value of the elastic block 5 material capable of restoring elastic deformation.
The elastic block mounting space 2-D is a hole formed in the longitudinal axis direction of the rotating shaft base 2.
The upper end arc surface 5-A of the elastic block 5 is in contact with the lower end arc surface 6-A of the rotating body 6, and the lower end plane 5-B of the elastic block 5 is in contact with the fixed seat 1.
Two screws 4 are also included;
the left end and the right end of the rotating shaft seat 2 are provided with extending parts, and the height of each extending part is smaller than that of the left rotating shaft mounting hole 2-B and the right rotating shaft mounting hole 2-C;
the extending parts at the left end and the right end are provided with rotating shaft seat screw mounting holes 2-A, and the fixed seat 1 is provided with two fixed seat screw mounting holes 1-A corresponding to the two rotating shaft seat screw mounting holes 2-A;
each screw 4 fixes the rotating shaft seat 2 on the fixed seat 1 through a corresponding rotating shaft seat screw mounting hole 2-A and a corresponding fixed seat screw mounting hole 1-A.
The fixed seat 1 and the rotating shaft seat 2 are integrally formed into the same part.
The embodiment of the invention provides a damping rotating shaft, wherein an elastic block mounting space is formed on a rotating shaft seat, an elastic block is arranged in the elastic block, and then the rotating shaft sequentially passes through a left rotating shaft mounting hole of the rotating shaft seat, a rotating shaft mounting hole of a rotating body and a right rotating shaft mounting hole of the rotating shaft seat, so that the elastic block is elastically deformed by the extrusion of the rotating body; the area size of the end face of the rotating body in the direction perpendicular to the rotating shaft is not particularly required, the size of the side wall of the rotating body is not particularly required, and the required space is small.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of a disassembled structure of a damping spindle according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a front side of a damping rotating shaft L2 according to an embodiment of the present invention;
FIG. 3 is a side view of a damping rotating shaft L2 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a front side of a damping rotating shaft L1 according to an embodiment of the present invention;
FIG. 5 is a side view of a damping rotating shaft L1 according to an embodiment of the present invention;
FIG. 6 is a schematic view of a disassembled structure of a damping spindle according to another embodiment of the present invention;
the device comprises a fixed seat 1, a fixed seat 2, a rotating shaft seat 3, a rotating shaft 4, a screw 5, an elastic block 6, a rotating body 7, a mechanism seat 1-A, a fixed seat screw mounting hole 2-A, a rotating shaft seat screw mounting hole 2-B, a left rotating shaft mounting hole on the rotating shaft seat 2-C, a right rotating shaft mounting hole on the rotating shaft seat 2-D, an elastic block mounting space 5-A and an upper end arc surface of the elastic block; 5-B, the lower end plane of the elastic block; 6-A, a lower end arc surface of the rotating body; 6-B, a rotating shaft mounting hole on the rotating body; 7-A-mounting groove for elastic block of mechanism seat; 7-B-mounting hole of left rotating shaft of mechanism seat; 7-C-mounting hole of right rotating shaft of mechanism seat; 7-D, bottom surface of mounting groove of elastic block of mechanism seat; l1, the free height of the arc surface at the upper end of the elastic block; l2, height from the lower end arc surface of the rotating body to the fixed seat.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
In an embodiment of the present invention, a damping spindle is provided, and fig. 1 is a schematic view of a disassembled structure of a damping spindle according to an embodiment of the present invention, including: the rotating shaft 3, the elastic block 5, the rotating body 6 and the mechanism seat 7;
wherein, mechanism seat 7 includes fixing base 1 and pivot seat 2. An elastic block installation space 2-D is formed in the rotating shaft seat 2, and the elastic block 5 is arranged in the elastic block installation space 2-D; the elastic block mounting space 2-D is a through hole formed in the direction of the longitudinal axis of the rotating shaft base 2.
The left side and the right side of the elastic block mounting space 2-D are respectively provided with a left rotating shaft mounting hole 2-B and a right rotating shaft mounting hole 2-C; a rotating shaft mounting hole 6-B is formed in the lower part of the rotating body 6; the rotating shaft 3 sequentially passes through the left rotating shaft mounting hole 2-B of the rotating shaft seat 2, the rotating shaft mounting hole 6-B of the rotating body 6 and the right rotating shaft mounting hole 2-C of the rotating shaft seat 2.
Schematic diagrams of L2 are shown in fig. 2 and 3, and schematic diagrams of L1 are shown in fig. 4 and 5. The height L1 of the upper end arc surface 5-A of the elastic block 5 when not compressed and deformed is larger than the height L2 from the lower end arc surface 6-A of the rotating body 6 to the fixed seat 1, the upper end arc surface 5-A of the elastic block 5 is contacted with the lower end arc surface 6-A of the rotating body 6, the lower end plane 5-B of the elastic block 5 is contacted with the fixed seat 1, and after the rotating shaft seat 2 is fixed on the fixed seat 1 by the screw 4, the elastic block 5 is elastically deformed by the extrusion of the rotating body 6 and the fixed seat 1. When the rotating body 6 rotates, a friction force is generated between the upper end arc surface 5-A of the elastic block 5 and the lower end arc surface 6-A of the rotating body 6, and the friction force is characterized as a damping force in use. The larger L1 is compared with L2, the larger the elastic deformation of the elastic body is, and the larger the damping force generated when the rotary body 6 rotates relative to the fixed seat 1 is. When the damping force of the rotating body 6 during rotation needs to be increased, the height L1 of the arc surface of the elastic block 5 when not being pressed can be increased, or the distance L2 between the arc surface of the rotating body 6 and the mechanism seat can be reduced.
In the damping rotating shaft in the embodiment, because the height of the upper end arc surface of the elastic block when the upper end arc surface is not compressed and deformed is greater than the height between the lower end arc surface of the rotating body and the fixed seat, the elastic block is extruded by the rotating body and the fixed seat to generate elastic deformation, and friction force is generated between the elastic block and the rotating body when the rotating body rotates, which is characterized as damping force, the damping rotating shaft can be realized only by pressing the elastic body under the side wall of the rotating body, and the damping rotating shaft is simple in structure and low in cost; the area size of the end face of the rotating body in the direction perpendicular to the rotating shaft is not particularly required, the size of the side wall of the rotating body is not particularly required, and the required space is small.
The installation steps of the damping rotating shaft in the embodiment are as follows: step 1, a rotating shaft 3 sequentially passes through a left rotating shaft mounting hole 2-B of a rotating shaft seat 2, a rotating shaft mounting hole 6-B of a rotating body 6 and a right rotating shaft mounting hole 2-C of the rotating shaft seat 2 to be assembled, and an elastic block is well arranged; and 2, fixing the rotating shaft seat 2 in 2 fixing seat screw mounting holes 1-A on the fixing seat 1 by using 2 screws 4, and extruding the elastic block 5 by the rotating body 6 and the fixing seat 1 to generate friction force.
On the basis of the above embodiments, in the present embodiment, after the features of the rotating shaft seat 2 except for the screw mounting hole of the rotating shaft seat are designed on the fixed seat 1, the fixed seat 1 and the rotating shaft seat 2 are integrated into one piece.
As shown in FIG. 6, a mechanism seat elastic block mounting groove 7-A, a mechanism seat left rotating shaft mounting hole 7-B and a mechanism seat right rotating shaft mounting hole 7-C are provided on the mechanism seat 7. When the mechanism seat is installed, the elastic block 5 is firstly placed in the mechanism seat elastic block installation groove 7-A of the mechanism seat 7, the rotator 6 is clamped by using an auxiliary tool, the rotator 6 extrudes the elastic block 5, when the rotating shaft installation hole 6-B on the rotator 6, the mechanism seat left rotating shaft installation hole 7-B and the mechanism seat right rotating shaft installation hole 7-C are aligned, the rotating shaft 3 is installed and fixed, and then the auxiliary installation tool is removed. At the moment, the upper end arc surface 5-A of the elastic block is in contact with the lower end arc surface 6-A of the rotating body, the lower end plane 5-B of the elastic block is in contact with the bottom surface 7-D of the installation groove of the elastic block of the mechanism seat, the elastic block 5 is extruded up and down by the rotating body 6 and the mechanism seat 7 to generate elastic deformation, and friction force is generated between the upper end arc surface 5-A of the elastic block and the lower end arc surface 6-A of the rotating body and is represented as damping force when the rotating body 6 rotates.
In this embodiment, the distance L3 between the lower arc surface 6-A of the rotator and the bottom surface 7-D of the mounting groove of the elastic block of the mechanism seat must be smaller than the height L1 when the upper arc surface of the elastic block is not pressed. The larger the difference between L1 and L3 is, the larger the force required to compress the elastic piece is, the larger the elastic deformation of the elastic piece is, and the larger the damping force generated when the rotary body 6 rotates relative to the mechanism base 7 is.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A damped rotary shaft, comprising: the device comprises a rotating shaft (3), an elastic block (5), a rotating body (6) and a mechanism seat (7);
the mechanism seat (7) comprises a fixed seat (1) and a rotating shaft seat (2);
an elastic block mounting space (2-D) is formed in the rotating shaft seat (2), and the elastic block (5) is arranged in the elastic block mounting space (2-D);
the left side and the right side of the elastic block mounting space (2-D) are respectively provided with a left rotating shaft mounting hole (2-B) and a right rotating shaft mounting hole (2-C);
a rotating shaft mounting hole (6-B) is formed in the lower part of the rotating body (6);
the rotating shaft (3) sequentially penetrates through a left rotating shaft mounting hole (2-B) of the rotating shaft seat (2), a rotating shaft mounting hole (6-B) of the rotating body (6) and a right rotating shaft mounting hole (2-C) of the rotating shaft seat (2).
2. The damped rotary shaft according to claim 1, wherein when the rotary body (6) is installed above the elastic block installation space (2-D) through the rotary shaft (3), a height between a lower end arc surface (6-a) of the rotary body (6) and the fixed seat (1) is L2;
when the elastic block (5) is installed in the elastic block installation space (2-D) and the rotating body (6) is not installed, the elastic block (5) is in a free state, and the height L1 between the upper end arc surface (5-A) of the elastic block (5) and the fixed seat (1) is the free height of the upper end arc surface (5-A) of the elastic block (5);
l1 is greater than L2.
3. Damping spindle according to claim 2, characterised in that the spring block mounting space (2-D) is a hole made in the direction of the longitudinal axis of the spindle base (2).
4. The damping spindle according to claim 3, characterized in that when the elastic block (5) is installed in the elastic block installation space (2-D), the upper end arc surface (5-A) of the elastic block (5) is in contact with the lower end arc surface (6-A) of the rotating body (6), and the lower end plane (5-B) of the elastic block (5) is in contact with the fixed seat (1);
since L1 is larger than L2, when the rotating shaft seat (2) is fixed on the fixed seat (1) by a screw (4), the elastic block (5) is elastically deformed by the vertical extrusion of the rotating body (6) and the fixed seat (1);
when the rotating body (6) rotates, a friction force is generated between the upper end arc surface (5-A) of the elastic block (5) and the lower end arc surface (6-A) of the rotating body (6), and the friction force is characterized by a damping force, wherein the larger the difference between L1 and L2 is, the larger the damping force is.
5. Damping spindle according to claim 2, characterized in that the amount of compression deformation (L1-L2)/L1 of the elastic mass (5) in operation is smaller than the allowable value of the amount of compression of the material of the elastic mass (5) to recover the elastic deformation.
6. Damping spindle according to any one of claims 1-5, characterized by comprising two screws (4);
the left end and the right end of the rotating shaft seat (2) are provided with extending parts, and the height of each extending part is smaller than that of the left rotating shaft mounting hole (2-B) and that of the right rotating shaft mounting hole (2-C);
the extension parts at the left end and the right end are provided with rotating shaft seat screw mounting holes (2-A), and the fixed seat (1) is provided with two fixed seat screw mounting holes (1-A) corresponding to the two rotating shaft seat screw mounting holes (2-A);
each screw (4) fixes the rotating shaft seat (2) on the fixed seat (1) through a corresponding rotating shaft seat screw mounting hole (2-A) and a corresponding fixed seat screw mounting hole (1-A).
7. Damping spindle according to claim 1, characterized in that the holder (1) and the spindle holder (2) are one and the same part, which is formed in one piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175479.1A CN110821949A (en) | 2019-11-26 | 2019-11-26 | Damping rotating shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911175479.1A CN110821949A (en) | 2019-11-26 | 2019-11-26 | Damping rotating shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110821949A true CN110821949A (en) | 2020-02-21 |
Family
ID=69559534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911175479.1A Pending CN110821949A (en) | 2019-11-26 | 2019-11-26 | Damping rotating shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110821949A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB665358A (en) * | 1947-12-22 | 1952-01-23 | Automatic Elect Lab | Bearing assembly |
| US6216317B1 (en) * | 1999-12-27 | 2001-04-17 | Tzn-Cha Chen | Handle adjustable in locating angle thereof |
| CN1397742A (en) * | 2002-08-30 | 2003-02-19 | 张金宝 | Bearing mechanism |
| CN201535312U (en) * | 2009-11-17 | 2010-07-28 | 元镫金属股份有限公司 | Cylindrical structure of a rotation shaft |
| CN202266578U (en) * | 2011-10-09 | 2012-06-06 | 大唐移动通信设备有限公司 | Damping hinge |
| CN203394988U (en) * | 2013-04-03 | 2014-01-15 | 杭州安费诺飞凤通信部品有限公司 | Novel friction rotating shaft gemel |
| CN205050022U (en) * | 2015-10-19 | 2016-02-24 | 苏州耕源电子科技有限公司 | Notebook screen axle fixing base |
| CN106015309A (en) * | 2016-07-04 | 2016-10-12 | 中国电子科技集团公司第三十九研究所 | Elastic self-locking hinge |
| CN205713605U (en) * | 2016-04-18 | 2016-11-23 | 福建西河卫浴科技有限公司 | A kind of viscose-type glass hinge for door |
| CN207229659U (en) * | 2017-09-11 | 2018-04-13 | 山东玲珑机电有限公司 | A kind of rotary body damping mechanism |
| CN108979385A (en) * | 2018-07-16 | 2018-12-11 | 佛山市远阳五金制品有限公司 | A kind of damping adjustable hinge |
-
2019
- 2019-11-26 CN CN201911175479.1A patent/CN110821949A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB665358A (en) * | 1947-12-22 | 1952-01-23 | Automatic Elect Lab | Bearing assembly |
| US6216317B1 (en) * | 1999-12-27 | 2001-04-17 | Tzn-Cha Chen | Handle adjustable in locating angle thereof |
| CN1397742A (en) * | 2002-08-30 | 2003-02-19 | 张金宝 | Bearing mechanism |
| CN201535312U (en) * | 2009-11-17 | 2010-07-28 | 元镫金属股份有限公司 | Cylindrical structure of a rotation shaft |
| CN202266578U (en) * | 2011-10-09 | 2012-06-06 | 大唐移动通信设备有限公司 | Damping hinge |
| CN203394988U (en) * | 2013-04-03 | 2014-01-15 | 杭州安费诺飞凤通信部品有限公司 | Novel friction rotating shaft gemel |
| CN205050022U (en) * | 2015-10-19 | 2016-02-24 | 苏州耕源电子科技有限公司 | Notebook screen axle fixing base |
| CN205713605U (en) * | 2016-04-18 | 2016-11-23 | 福建西河卫浴科技有限公司 | A kind of viscose-type glass hinge for door |
| CN106015309A (en) * | 2016-07-04 | 2016-10-12 | 中国电子科技集团公司第三十九研究所 | Elastic self-locking hinge |
| CN207229659U (en) * | 2017-09-11 | 2018-04-13 | 山东玲珑机电有限公司 | A kind of rotary body damping mechanism |
| CN108979385A (en) * | 2018-07-16 | 2018-12-11 | 佛山市远阳五金制品有限公司 | A kind of damping adjustable hinge |
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Effective date of registration: 20201023 Address after: 430205 Hubei city of Wuhan province Jiangxia Hidden Dragon Island Tan lake two Road No. 1 Applicant after: Wuhan Hongxin Technology Development Co.,Ltd. Address before: 430073 Hubei province Wuhan Dongxin East Lake high tech Development Zone, Road No. 5 Applicant before: Wuhan Hongxin Telecommunication Technologies Co.,Ltd. |
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Application publication date: 20200221 |
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