CN110919876A - Drilling machine for construction - Google Patents
Drilling machine for construction Download PDFInfo
- Publication number
- CN110919876A CN110919876A CN201911298527.6A CN201911298527A CN110919876A CN 110919876 A CN110919876 A CN 110919876A CN 201911298527 A CN201911298527 A CN 201911298527A CN 110919876 A CN110919876 A CN 110919876A
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- rod
- drilling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/14—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by boring or drilling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a drilling machine for construction, which structurally comprises a drill rod, a limiting device, an auxiliary handle, a shell and a telescopic shoulder support, wherein the drill rod is connected with the shell, the drill rod is mechanically matched with the shell, the drill rod is mechanically connected with the limiting device, the auxiliary handle and the handle are vertically arranged, the auxiliary handle and the handle are fixedly connected with the shell, and the telescopic shoulder support is arranged on one end, far away from the drill rod, of the shell, so that the drilling machine has the beneficial effects that: aim at the drilling rod on the mark hole to use mark point evenly distributed around the mark point as the centre of a circle with the help of three suction head, because the outer atmospheric pressure of arc wall is greater than the atmospheric pressure in the arc wall, make the position of arc wall fixed, utilize the spin to make the slip between movable wheel and the ring channel inner wall more smooth and easy, and the length of revolving bar remains unchanged all the time, make the relative position between activity dish and the drilling rod can not change, realize that the drilling scope of drilling rod is unchangeable, the drilling precision has been improved greatly.
Description
Technical Field
The invention relates to the field of drilling machines, in particular to a drilling machine for construction.
Background
With the development of industry, drilling machines are gradually improved, drilling does not need to be knocked, drilled and ground by manpower, the drilling machines are divided into portable drilling machines and base drilling machines, and the current drilling machines for electric power construction have the following defects:
the drilling rod is replaced through using wire rope to current electric power construction drilling machine, has reduced the height of drilling machine and has made the complete machine focus reduce, and portable drilling machine will mark drilling hole department earlier before drilling, then moves the drilling machine and aim at mark department and drill, and the drilling machine can produce the vibration at the in-process of drilling for the drill bit with mark department skew, cause the precision that punches to reduce.
Disclosure of Invention
Aiming at the defects of the prior art, the invention is realized by the following technical scheme: a drilling machine for construction structurally comprises a drill rod, a limiting device, an auxiliary handle, a shell and a telescopic shoulder support, wherein the drill rod is connected with the shell, the drill rod is mechanically matched with the shell, the drill rod is mechanically connected with the limiting device, the auxiliary handle and the handle are vertically arranged, the auxiliary handle and the handle are fixedly connected with the shell, and the telescopic shoulder support is arranged at one end, far away from the drill rod, of the shell;
the limiting device is composed of a drill rod connecting ring, a rotating ring, a fixing mechanism and an annular hollow frame, the drill rod connecting ring is connected with a drill rod, the outer diameter of the drill rod connecting ring is equal to the inner diameter of the rotating ring, the rotating ring is fixedly connected with the drill rod connecting ring, the rotating ring is matched with the fixing mechanism, and a gap between the fixing mechanism and the rotating ring is formed into the annular hollow frame.
As a further optimization of the invention, the rotating ring is composed of three rotating rods, annular grooves, movable wheels and fixed balls, the three rotating rods are distributed equally, the rotating rods are welded with the fixed balls mechanically, the fixed balls are fixedly arranged on the inner wall of the fixed mechanism, the fixed balls are connected with the movable wheels through the rotating rods, the movable wheels are arranged in the annular grooves, the movable wheels are in mechanical sliding fit with the annular grooves, and the annular grooves are arranged in concentric annular shapes.
As a further optimization of the invention, the fixing mechanism is composed of a movable rod, a movable rod groove, a suction head and an annular disc, wherein the movable rod is arranged in the movable rod groove, the movable rod groove is positioned on the annular disc, the annular disc is penetrated through by the movable rod groove, the movable rod is matched with the movable rod groove, and the suction head is connected with the movable rod.
As a further optimization of the invention, the movable wheel comprises nine rolling balls, a fixed ring rod, an arc-shaped groove and a rolling layer, the number of the rolling balls is nine, the rolling balls are uniformly distributed on the outer edge of the rolling layer, the rolling balls are arranged in the arc-shaped groove, the arc-shaped groove is arranged on the outer edge of the rolling layer, the arc-shaped groove is arranged on the rolling layer in an embedded mode, the fixed ring rod penetrates through the rolling balls, and the rolling balls are mechanically connected with the fixed ring rod.
As a further optimization of the invention, the annular disc is composed of a movable disc and a fixed disc, the movable disc and the fixed disc have the same structure, the fixed disc is fixedly connected with the drill rod, the movable disc is movably connected with the drill rod, and the movable disc is matched with the fixed disc to realize the fixation of the drilling range.
As a further optimization of the invention, the suction head is composed of a solid layer and a suction port, the solid layer is fixedly connected with the drill rod, the suction port is inwards sunken in a semi-elliptical shape, and the suction port is connected with the solid layer.
As a further optimization of the invention, the movable rod is provided with a limiting plate, the diameter of the limiting plate is far larger than that of the groove of the movable rod, and the limiting plate is arranged at one end of the movable rod far away from the suction head.
Advantageous effects
The invention relates to a drilling machine for construction, wherein a drill rod is aligned on a marking hole, a movable rod is pushed forwards to drive a movable disc to move to one side far away from a fixed disc, a suction head on the movable rod is quickly adsorbed on a wall under the action of pushing force, the position of an arc groove is fixed because the external air pressure of the arc groove is greater than the air pressure in the arc groove, a rotating ring is driven to rotate when the drill rod rotates for drilling, a movable wheel is embedded in an annular groove to rotate, a plurality of rolling balls are arranged on the outer surface of the movable wheel in the working process of the drill rod, so that the sliding between the movable wheel and the inner wall of the annular groove is smoother, the length of the rotating rod is kept unchanged all the time, the relative position between the movable disc and the drill rod cannot be changed, three suction heads are adsorbed around the marking point all the time when the drill rod drills, and the vibration position of, the drilling range of the drill rod is unchanged, and the drilling precision is greatly improved.
Compared with the prior art, the invention has the following advantages:
the drill rod is aligned to the marking hole, the three suction heads are uniformly distributed around the marking point by taking the marking point as a circle center, the position of the arc-shaped groove is fixed because the external air pressure of the arc-shaped groove is greater than the air pressure in the arc-shaped groove, the sliding between the movable wheel and the inner wall of the annular groove is smoother by utilizing the rolling ball, the length of the rotating rod is kept unchanged all the time, the relative position between the movable disc and the drill rod cannot be changed, the drilling range of the drill rod is unchanged, and the drilling accuracy is greatly improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural view of a construction drill according to the present invention.
Fig. 2 is a sectional view of a limiting device of a drilling machine for construction according to the present invention.
Fig. 3 is a working state diagram of a limiting device of the drilling machine for construction of the invention.
Fig. 4 is a structure view of a movable wheel of a boring machine for construction according to the present invention.
Fig. 5 is a sectional view of a movable wheel of a boring machine for construction according to the present invention.
FIG. 6 is a view showing a connection mode of a rotary rod and a movable wheel of the drilling machine for construction according to the present invention.
FIG. 7 is a view showing a structure of a suction head of a boring machine for construction according to the present invention.
Fig. 8 is an operation state diagram of fig. 7.
In the drawing, a drill rod-1, a limiting device-2, an auxiliary handle-3, a handle-4, a shell-5, a telescopic shoulder support-6, a drill rod connecting ring-a, a rotating ring-b, a fixing mechanism-c, an annular hollow frame-d, a rotating rod-b 1, an annular groove-b 2, a movable wheel-b 3, a fixed ball-b 4, a movable rod-c 1, a movable rod groove-c 2, a suction head-c 3, an annular disc-c 4, a rolling ball-b 31, a fixed ring rod-b 32, an arc groove-b 33, a rolling layer-b 34, a movable disc-c 41, a fixed disc-c 42, a solid layer-c 31, a suction port-c 32 and a limiting plate-c 11.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the following description and the accompanying drawings further illustrate the preferred embodiments of the invention.
Example 1
Referring to fig. 1-8, the invention provides a drilling machine for construction, which structurally comprises a drill rod 1, a limiting device 2, an auxiliary handle 3, a handle 4, a shell 5 and a telescopic shoulder support 6, wherein the drill rod 1 is connected with the shell 5, the drill rod 1 is mechanically matched with the shell 5, the drill rod 1 is mechanically connected with the limiting device 2, the auxiliary handle 3 and the handle 4 are vertically arranged, the auxiliary handle 3 and the handle 4 are both fixedly connected with the shell 5, and the telescopic shoulder support 6 is arranged on one end of the shell 5 far away from the drill rod 1;
the limiting device 2 is composed of a drill rod connecting ring a, a rotating ring b, a fixing mechanism c and an annular hollow frame d, the drill rod connecting ring a is connected with the drill rod 1, the outer diameter of the drill rod connecting ring a is equal to the inner diameter of the rotating ring b, the rotating ring b is fixedly connected with the drill rod connecting ring a, the rotating ring b is matched with the fixing mechanism c, and a gap between the fixing mechanism c and the rotating ring b forms the annular hollow frame d.
The rotating ring b is composed of three rotating rods b1, an annular groove b2, a movable wheel b3 and a fixed ball b4, the three rotating rods b1 are distributed evenly, the rotating rod b1 is mechanically welded with the fixed ball b4, the fixed ball b4 is fixedly installed on the inner wall of the fixed mechanism c, the fixed ball b4 is connected with the movable wheel b3 through a rotating rod b1, the movable wheel b3 is arranged in the annular groove b2, the movable wheel b3 is in mechanical sliding fit with the annular groove b2, the annular groove b2 is arranged in a concentric annular shape, and the movable wheel b3 slides in the annular groove b2, so that the rotating ring b and the fixed mechanism c can be connected in a relative movable manner and are matched with each other.
The fixing mechanism c is composed of a movable rod c1, a movable rod groove c2, a sucker c3 and an annular disc c4, the movable rod c1 is installed in the movable rod groove c2, the movable rod groove c2 is located on the annular disc c4, the annular disc c4 is penetrated through the movable rod groove c2, the movable rod c1 is matched with the movable rod groove c2, the sucker c3 is connected with the movable rod c1, the annular disc c4 is penetrated through the movable rod c1, three movable rod grooves c2 are arranged and are evenly distributed on the annular disc c4, and therefore the three movable rods c1 are distributed in a regular triangle shape.
The movable wheel b3 is composed of a rolling ball b31, a fixed ring bar b32, an arc-shaped groove b33 and a rolling layer b34, nine rolling balls b31 are uniformly distributed on the outer edge of the rolling layer b34, the rolling ball b31 is arranged in the arc-shaped groove b33, the arc-shaped groove b33 is arranged on the outer edge of the rolling layer b34, the arc-shaped groove b33 is arranged on the rolling layer b34 in an embedded mode, the fixed ring bar b32 penetrates through the rolling ball b31, the rolling ball b31 is mechanically connected with the fixed ring bar, the inner diameter of the arc-shaped groove b33 is larger than the diameter of the rolling ball b31, and therefore the b31 can freely roll in the arc-shaped groove b 33.
Annular dish c4 comprises activity dish c41, fixed disk c42, activity dish c41 is the same with fixed disk c42 structure, fixed disk c42 and drilling rod 1 fixed connection, activity dish c41 and drilling rod 1 swing joint, activity dish c41 cooperatees with fixed disk c42, realizes drilling range's fixed.
The suction head c3 is composed of a solid layer c31 and a suction port c32, the solid layer c31 is fixedly connected with the drill rod 1, the suction port c32 is recessed inwards in a semi-elliptical shape, and the suction port c32 is connected with a solid layer c 31.
The movable rod c1 is provided with a limit plate c11, the diameter of the limit plate c11 is far larger than that of the movable rod groove c2, and the limit plate c11 is arranged at one end of the movable rod c1 far away from the sucker c 3.
Aim at drilling rod 1 on the mark hole, push away movable rod c1 forward, thereby drive movable disc c41 toward keeping away from the one side motion of fixed disk c42, suction head c3 on the movable rod c1 is under the effect of thrust, arc wall b33 adsorbs on the wall fast, because the outer atmospheric pressure of arc wall b33 is greater than the atmospheric pressure in arc wall b33, make the position of arc wall b33 fixed, when drilling rod 1 rotates and drills, can drive rotatory ring b rotatory thereupon, activity wheel b3 gomphosis is at ring channel b2 internal rotation, make the in-process of drilling rod 1 work, relative position between movable disc c41 and the drilling rod 1 can not change, realize that the drilling range of drilling rod 1 does not change, the drilling precision has been improved greatly.
Example 2
Referring to fig. 1-2 and 5, the invention provides a drilling machine for construction, which structurally comprises a drill rod 1, a limiting device 2, an auxiliary handle 3, a handle 4, a shell 5 and a telescopic shoulder support 6, wherein the drill rod 1 is connected with the shell 5, the drill rod 1 is mechanically matched with the shell 5, the drill rod 1 is mechanically connected with the limiting device 2, the auxiliary handle 3 and the handle 4 are vertically arranged, the auxiliary handle 3 and the handle 4 are both fixedly connected with the shell 5, and the telescopic shoulder support 6 is arranged at one end of the shell 5 far away from the drill rod 1; the limiting device 2 comprises a drill rod connecting ring a, a rotating ring b, a fixing mechanism c and an annular hollow frame d, the drill rod connecting ring a is connected with the drill rod 1, the outer diameter of the drill rod connecting ring a is equal to the inner diameter of the rotating ring b, the rotating ring b is fixedly connected with the drill rod connecting ring a, the rotating ring b is matched with the fixing mechanism c, and a gap between the fixing mechanism c and the rotating ring b forms the annular hollow frame d; the rotating ring b is composed of a rotating rod b1, an annular groove b2, a movable wheel b3 and a fixed ball b 4; the movable wheel b3 is composed of a rolling ball b31, a fixed ring bar b32, an arc-shaped groove b33 and a rolling layer b34, nine rolling balls b31 are uniformly distributed on the outer edge of the rolling layer b34, the rolling ball b31 is arranged in the arc-shaped groove b33, the arc-shaped groove b33 is arranged on the outer edge of the rolling layer b34, the arc-shaped groove b33 is arranged on the rolling layer b34 in an embedded mode, the fixed ring bar b32 penetrates through the rolling ball b31, the rolling ball b31 is mechanically connected with the fixed ring bar, the inner diameter of the arc-shaped groove b33 is larger than the diameter of the rolling ball b31, and therefore the b31 can freely roll in the arc-shaped groove b 33.
A plurality of rolling balls b31 are arranged on the outer surface of the movable wheel b3, so that the sliding between the movable wheel b3 and the inner wall of the annular groove b2 is smoother, the length of the rotating rod b1 is kept unchanged all the time, the relative position between the movable disc c41 and the drill rod 1 cannot be changed, the three suction heads c3 are adsorbed around a mark point all the time when the drill rod 1 drills, and the vibration position of the drill rod 1 is in the range all the time in the drilling process.
The invention solves the problems that the height of the existing electric construction drilling machine is reduced by replacing a drill rod with a steel wire rope, so that the gravity center of the whole machine is reduced, the portable drilling machine marks the drill hole before drilling, then operates the drilling machine to drill the drill hole aiming at the mark, the drilling machine generates vibration in the drilling process, so that the drill bit and the mark deviate, and the drilling precision is reduced, the drilling machine aligns the drill rod 1 on the mark hole through the mutual combination of the components, and uniformly distributes around the mark point by using three suction heads c3 and taking the mark point as a circle center, because the external air pressure of an arc-shaped groove b33 is greater than the air pressure in the arc-shaped groove b33, the position of a rolling ball of the arc-shaped groove b33 is fixed, the sliding between a movable wheel b3 and the inner wall of an annular groove b2 is smoother by using b31, and the length of a rotating rod b1 is always kept unchanged, so that the relative position between the movable disc c41 and, the drilling range of the drill rod 1 is unchanged, and the drilling precision is greatly improved.
While there have been shown and described what are at present considered the fundamental principles of the invention, the essential features and advantages thereof, it will be understood by those skilled in the art that the present invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but rather, is capable of numerous changes and modifications in various forms without departing from the spirit or essential characteristics thereof, and it is intended that the invention be limited not by the foregoing descriptions, but rather by the appended claims and their equivalents.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. The utility model provides a drilling machine for construction, its structure includes drilling rod (1), stop device (2), auxiliary handle (3), handle (4), casing (5), scalable shoulder hold in the palm (6), its characterized in that:
the drill rod (1) is connected with the shell (5), the drill rod (1) is mechanically matched with the shell (5), the drill rod (1) is mechanically connected with the limiting device (2), the auxiliary handle (3) and the handle (4) are vertically arranged, the auxiliary handle (3) and the handle (4) are fixedly connected with the shell (5), and the telescopic shoulder support (6) is arranged at one end, far away from the drill rod (1), of the shell (5);
stop device (2) comprise drilling rod go-between (a), rotatory ring (b), fixed establishment (c), annular fretwork frame (d), drilling rod go-between (a) is connected with drilling rod (1), drilling rod go-between (a) external diameter equals rotatory ring (b) internal diameter, rotatory ring (b) and drilling rod go-between (a) fixed connection, rotatory ring (b) cooperatees with fixed establishment (c), annular fretwork frame (d) is constituted in the space between fixed establishment (c) and the rotatory ring (b).
2. A construction drill according to claim 1, wherein: the rotating ring (b) is composed of a rotating rod (b1), an annular groove (b2), a movable wheel (b3) and a fixed ball (b4), the rotating rod (b1) is mechanically welded with the fixed ball (b4), the fixed ball (b4) is fixedly installed on the inner wall of the fixed mechanism (c), the fixed ball (b4) is connected with the movable wheel (b3) through the rotating rod (b1), and the movable wheel (b3) is in mechanical sliding fit with the annular groove (b 2).
3. A construction drill according to claim 1 or 2, wherein: fixed establishment (c) comprises movable rod (c1), movable rod groove (c2), suction head (c3), annular disc (c4), movable rod (c1) are installed in movable rod groove (c2), annular disc (c4) is run through in movable rod groove (c2), movable rod (c1) and movable rod groove (c2) cooperate, suction head (c3) are connected with movable rod (c 1).
4. A construction drill according to claim 2, wherein: the movable wheel (b3) is composed of a rolling ball (b31), a fixed ring rod (b32), an arc-shaped groove (b33) and a rolling layer (b34), the rolling ball (b31) is installed in the arc-shaped groove (b33), the arc-shaped groove (b33) is installed on the rolling layer (b34) in an embedded mode, the fixed ring rod (b32) penetrates through the rolling ball (b31), and the rolling ball (b31) is mechanically connected with the fixed ring rod.
5. A construction drill according to claim 3, wherein: annular dish (c4) comprises activity dish (c41), fixed disk (c42), activity dish (c41) is the same with fixed disk (c42) structure, fixed disk (c42) and drilling rod (1) fixed connection, activity dish (c41) and drilling rod (1) swing joint.
6. A construction drill according to claim 3, wherein: the suction head (c3) is composed of a solid layer (c31) and a suction opening (c32), the solid layer (c31) is fixedly connected with the drill rod (1), the suction opening (c32) is inwards sunken in a semi-elliptical shape, and the suction opening (c32) is connected with the solid layer (c 31).
7. A construction drill according to claim 1, wherein: a limiting plate (c11) is arranged on the movable rod (c1), the diameter of the limiting plate (c11) is far larger than that of the movable rod groove (c2), and the limiting plate (c11) is arranged at one end, far away from the sucker (c3), of the movable rod (c 1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911298527.6A CN110919876A (en) | 2019-12-17 | 2019-12-17 | Drilling machine for construction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911298527.6A CN110919876A (en) | 2019-12-17 | 2019-12-17 | Drilling machine for construction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110919876A true CN110919876A (en) | 2020-03-27 |
Family
ID=69863990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911298527.6A Pending CN110919876A (en) | 2019-12-17 | 2019-12-17 | Drilling machine for construction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110919876A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111588440A (en) * | 2020-06-01 | 2020-08-28 | 王春晖 | Auxiliary positioning frame for orthopedic drilling aiming |
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| CN201900299U (en) * | 2010-12-26 | 2011-07-20 | 黄冈职业技术学院 | Rotary drill bushing |
| CN205200609U (en) * | 2015-12-01 | 2016-05-04 | 北京建筑大学 | Drilling machine for building |
| JP2016187921A (en) * | 2015-03-30 | 2016-11-04 | 公益財団法人鉄道総合技術研究所 | Drill device for measuring neutralization of concrete |
| CN208132050U (en) * | 2018-02-28 | 2018-11-23 | 青岛旺达水下工程有限公司 | A kind of drill positioning device of underwater drilling equipment |
| CN208290216U (en) * | 2018-06-02 | 2018-12-28 | 赵科宇 | Tile drilling locating rack |
| CN109304502A (en) * | 2018-10-10 | 2019-02-05 | 王海南 | A kind of ergonomics hole depth adjusting and anti-offset mechanical punching machine |
| CN209578259U (en) * | 2019-03-08 | 2019-11-05 | 吴刚 | Building construction wall body hole machine |
-
2019
- 2019-12-17 CN CN201911298527.6A patent/CN110919876A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201900299U (en) * | 2010-12-26 | 2011-07-20 | 黄冈职业技术学院 | Rotary drill bushing |
| JP2016187921A (en) * | 2015-03-30 | 2016-11-04 | 公益財団法人鉄道総合技術研究所 | Drill device for measuring neutralization of concrete |
| CN205200609U (en) * | 2015-12-01 | 2016-05-04 | 北京建筑大学 | Drilling machine for building |
| CN208132050U (en) * | 2018-02-28 | 2018-11-23 | 青岛旺达水下工程有限公司 | A kind of drill positioning device of underwater drilling equipment |
| CN208290216U (en) * | 2018-06-02 | 2018-12-28 | 赵科宇 | Tile drilling locating rack |
| CN109304502A (en) * | 2018-10-10 | 2019-02-05 | 王海南 | A kind of ergonomics hole depth adjusting and anti-offset mechanical punching machine |
| CN209578259U (en) * | 2019-03-08 | 2019-11-05 | 吴刚 | Building construction wall body hole machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111588440A (en) * | 2020-06-01 | 2020-08-28 | 王春晖 | Auxiliary positioning frame for orthopedic drilling aiming |
| CN111588440B (en) * | 2020-06-01 | 2024-01-26 | 李雯雯 | Orthopedics drilling aims auxiliary positioning frame |
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Application publication date: 20200327 |