CN111103085B - Mechanical pressure sensor - Google Patents
Mechanical pressure sensor Download PDFInfo
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- CN111103085B CN111103085B CN201911295396.6A CN201911295396A CN111103085B CN 111103085 B CN111103085 B CN 111103085B CN 201911295396 A CN201911295396 A CN 201911295396A CN 111103085 B CN111103085 B CN 111103085B
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- contact
- spring
- pressure sensor
- support
- contact piece
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/02—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers, electric circuits therefor, e.g. bridges, amplifiers or signal conditioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention provides a mechanical pressure sensor, which is provided with double contacts or multiple contacts to be contacted with a metal wire row, so that the misalignment of integral pressure detection caused by the contact failure of a single contact and the metal wire row is prevented; on the basis, the arc-shaped contact is arranged, compared with the existing welding contact, the contact area between the arc-shaped contact and the metal wire row is larger, metal oxide particles can be prevented from isolating the contact and the metal wire as much as possible, the integral forming is facilitated, and the cost is reduced; on the basis, the fan-shaped metal wires are arranged, and the double contacts or the multiple contacts can always keep contact with the metal wires when rotating around the circle center, so that the contact performance is better compared with the existing parallel metal wires; the second contact is arranged, so that the contact plate body can be supported, the left side and the right side of the contact plate body are more balanced, and the contact plate body is prevented from obliquely contacting the thick-film resistor disc towards one side; the end part of the extension part is arc-shaped, so that the extension part can conveniently penetrate through the swing frame and is fixed with the swing frame, and the extension part can keep contact with the spring seat in the rotating process of the contact piece body.
Description
Technical Field
The invention relates to the field of pressure sensors, in particular to a mechanical pressure sensor.
Background
The mechanical pressure sensor is widely applied to the fields of automobiles, ship power pipelines, water treatment engineering, industrial process detection and control, hydropneumatic control engineering and the like, and the product has good vibration resistance, long service life, convenient installation, stable quality, reliable performance and wide working temperature range. It can be subdivided into oil pressure sensors, gas pressure sensors, etc. according to the field of application.
As shown in fig. 1, the core component of the mechanical pressure sensor is an elastic contact a1 and a thick film resistor a2, the thick film resistor a2 includes a ceramic substrate a20, metal wires a21 are arranged on the ceramic substrate a20 side by side, the thick film resistor a22 is continuously coated between adjacent metal wires a21, the metal wires a21 and the elastic contact a1 at zero positions are respectively connected with resistance detection equipment, when external pressure changes, the elastic contact a1 is driven to slide between the metal wires a21 arranged side by side, and the resistance between the metal wires a21 and the elastic contact a1 at zero positions changes, so that the change value of the external pressure is reflected.
However, in practical use, it is found that after the mechanical pressure sensor is used for a long time, the elastic contact piece a1 repeatedly rubs against the metal wire a21 and the ceramic substrate a20, metal oxide particles are easily generated, and when the particles just adhere between the metal wire a21 and the elastic contact piece a1, good electrical contact between the metal wire a21 and the elastic contact piece a1 cannot be maintained, so that the actually measured resistance value is large and unstable, and the pressure detection is misaligned.
Disclosure of Invention
In view of the above, the present invention provides a mechanical pressure sensor with higher pressure detection accuracy under long-time use condition.
The technical scheme of the invention is realized as follows: the invention provides a mechanical pressure sensor which comprises an elastic contact piece (1), a thick-film resistor disc (2) and a support (3), wherein the thick-film resistor disc (2) is fixed on the support (3), the thick-film resistor disc (2) comprises a ceramic substrate (20), a plurality of metal wires (21) and a thick-film resistor layer (22), the ceramic substrate (20) is provided with the plurality of metal wires (21) side by side, the thick-film resistor layer (22) is continuously coated between the adjacent metal wires (21), the elastic contact piece (1) comprises a contact piece body (11), one end of the contact piece body (11) is rotatably connected with the support (3), the other end of the contact piece body is provided with two or more first contacts (12), and the two or more first contacts (12) are in sliding connection with the metal wires (21) arranged side by side.
In addition to the above technical means, it is preferable that the plurality of metal wires (21) and the sliding connection portion of the first contact (12) are arranged in a fan shape.
In addition to the above technical solution, preferably, the first contact (12) is formed in an arc shape by extending and bending the contact body (11) toward the ceramic substrate (20).
On the basis of the technical scheme, preferably, the elastic contact piece (1) further comprises two or more second contacts (13), the first contact (12) and the second contact (13) are respectively located on two sides of the contact piece body (11), and the second contact (13) is connected with the thick film resistor piece (2) in a sliding mode.
Preferably, the thick-film resistor disc (2) further comprises a metal sheet (23), the metal sheet (23) is arranged on the surface of the ceramic substrate (20), a dividing line (230) is arranged in the middle of the metal sheet (23), the metal sheets (23) on two sides of the dividing line (230) are electrically non-conductive, and the second contact (13) is in sliding connection with the metal sheet (23).
On the basis of the technical scheme, preferably, still include hinge assembly (4) that resets, hinge assembly (4) that resets includes rocker (41) and reset spring (42), rocker (41) and support (3) rotatable coupling, reset spring (42) connection rocker (41) and support (3), and contact body (11) are fixed with rocker (41) and are kept away from the one end of first contact (12) and are provided with tip for circular-arc extension (14).
Preferably, the swing frame (41) is provided with an embedded groove (411) and a clamping hook (412), the middle of the contact piece body (11) is provided with a clamping groove (15), the contact piece body (11) is clamped into the embedded groove (411), the extending part (14) penetrates through the embedded groove (411), and the clamping hook (412) is clamped into the clamping groove (15).
Further preferably, the swing frame further comprises a spring (5), a base (6), a spring seat (7) and a spring cover (8), the base (6) and the spring cover (8) are fixed to each other and enclose a spring containing cavity, the spring (5) and the spring seat (7) are respectively arranged in the spring containing cavity, a support (3) is fixed to the spring cover (8), the spring seat (7) is arranged on the base (6), two ends of the spring (5) respectively abut against the base (6) and the spring cover (8), the arc-shaped end of the extension part (14) is in sliding connection with the spring seat (7), and a rolling part (413) is arranged on the swing frame (41) and abuts against the spring seat (7) through the rolling part (413).
Still further preferred, still include shell body (9), shell body (9) and spring housing (8) reciprocal anchorage and enclose and synthesize a support and hold the cavity, and elastic contact (1), thick film resistance card (2) and support (3) set up in the support holds the cavity.
Still further preferably, still include utmost point post (0), utmost point post (0) are fixed on shell body (9), and the metal wire (21) that is located the head is connected with utmost point post (0) electrical behavior.
Compared with the prior art, the mechanical pressure sensor has the following beneficial effects:
(1) by arranging double contacts or multiple contacts to contact with the metal line bank, the overall pressure detection misalignment caused by the contact failure of a single contact and the metal line bank is prevented;
(2) on the basis, the arc-shaped contact is arranged, compared with the existing welding contact, the contact area between the arc-shaped contact and the metal wire row is larger, metal oxide particles can be prevented from isolating the contact and the metal wire as much as possible, the integral forming is facilitated, and the cost is reduced;
(3) on the basis, the fan-shaped metal wires are arranged, and the double contacts or the multiple contacts can always keep contact with the metal wires when rotating around the circle center, so that the contact performance is better compared with the existing parallel metal wires;
(4) the second contact is arranged, so that the contact plate body can be supported, the left side and the right side of the contact plate body are more balanced, and the contact plate body is prevented from obliquely contacting the thick-film resistor disc towards one side;
(5) the end part of the extension part is arc-shaped, so that the extension part can conveniently penetrate through the swing frame and is fixed with the swing frame, and the extension part can keep contact with the spring seat in the rotating process of the contact piece body.
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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a conventional mechanical pressure sensor;
FIG. 2 is a perspective view of the mechanical pressure sensor of the present invention;
FIG. 3 is a top view of the mechanical pressure sensor of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is an exploded view of the mechanical pressure sensor of the present invention;
FIG. 6 is a perspective view of the rocker portion of the mechanical pressure sensor of the present invention;
FIG. 7 is a perspective view of the resilient contact portion of the mechanical pressure sensor of the present invention;
fig. 8 is a perspective view of a thick film resistor sheet portion of the mechanical pressure sensor of 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 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 obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 2, with reference to fig. 3 and 4, the mechanical pressure sensor of the present invention includes an elastic contact piece 1, a thick film resistor piece 2, a support 3, a return hinge assembly 4, a spring 5, a base 6, a spring seat 7, a spring cover 8, an outer housing 9, and a pole 0.
As shown in fig. 8, the thick film resistor sheet 2 includes a ceramic substrate 20, a plurality of metal lines 21, and a thick film resistor layer 22, wherein the ceramic substrate 20 is provided with the plurality of metal lines 21 side by side, and the thick film resistor layer 22 is continuously coated between adjacent metal lines 21. Therefore, the resistance value change between the metal wire 21 with the zero position and the elastic contact piece 1 only needs to be continuously detected, when the environmental pressure change to be detected is detected, the elastic contact piece 1 is pushed to slide on the metal wire 21 paper, and the environmental pressure change to be detected can be reflected by the resistance value change between the metal wire 21 and the elastic contact piece 1.
As shown in fig. 7, the elastic contact piece 1 includes a contact piece body 11, one end of the contact piece body 11 is rotatably connected to the support 3, and the other end is provided with two or more first contacts 12, and the two or more first contacts 12 are slidably connected to the metal wires 21 arranged side by side. In the present embodiment, the first contact 12 is provided with two, dual-contact designs, which can prevent the overall pressure detection misalignment caused by the failure of providing a single contact to contact with the metal line bank.
The conventional wire row generally arranges the wires 21 in parallel, and since the contact body 11 rotates around a fixed center, it is not parallel to the piece of the wires 21, so that when two or more first contacts 12 are arranged, some first contacts 12 may not contact the wires 21. To improve the above, as a preferred embodiment, the sliding connection portions of the plurality of wires 21 and the first contacts 12 are arranged in a fan shape. Specifically, the circle center of the sector coincides with the hinge point of the contact plate body 11 and the support 3, so that each metal wire 21 contacted with the contact plate body 11 in the rotation process of the contact plate body 11 can be ensured to be parallel to the contact plate body 11, and two or more first contacts 12 can be kept in contact with the metal wires 21.
The existing contact and the metal wire 21 are generally made of silver materials, the contact plate body 11 is generally made of copper materials, the design is that technical personnel in the field generally consider that the same and softer silver materials are worn relatively, and according to the design thought, the contact needs to be welded independently or fixed on the contact plate body 11 by adopting a fastening piece. As a result, the cost of installing a plurality of parts is high, and the contact needs to be machined into an arc shape, which results in high machining cost and high assembly cost. However, in practical use, it is found that the silver contact and the silver wire 21 are not worn lightly, and the copper contact and the silver wire 21 are matched to be soft and hard, so that the first contact 12 is made of copper and the silver wire 21 is worn lightly. Since the first contact 12 and the contact body 11 are made of the same material, they can be integrally formed, and as a preferred embodiment, the first contact 12 is arc-shaped and is formed by extending and bending the contact body 11 toward the ceramic substrate 20. Compare in current welding contact point, it is bigger with the metal wire row area of contact, can prevent isolated contact of metal oxide granule and metal wire 21 as far as possible, the integrated shaping of being convenient for, reduce cost, and wear resistance is better.
The first contact 12 is arranged on one side of the contact piece body 11 to be contacted with the thick film resistor 2, and the other side of the contact piece body 11 is stressed unevenly, so that in an extreme case, the contact piece body 11 is inclined to one side to be contacted with the thick film resistor 2. Therefore, the invention provides a preferred embodiment, the elastic contact piece 1 further comprises two or more second contacts 13, the first contact 12 and the second contact 13 are respectively located on two sides of the contact piece body 11, and the second contact 13 is slidably connected with the thick-film resistor piece 2. The first contact 12 and the second contact 13 arranged on the left side and the right side can enable the force of the contact piece body 11 to be more balanced.
The conventional mechanical pressure sensor generally further comprises a pressure alarm plate which is arranged in parallel with the thick film resistor disc 2, a PCB substrate is adopted, a metal sheet 23 is printed on the PCB substrate, a dividing line 230 is arranged in the middle of the metal sheet 23, and the metal sheets 23 on two sides of the dividing line 230 are electrically non-conductive. The circuit between the contact piece body 11 and the metal sheet 23 is in an open state in a normal pressure range; when the environmental pressure to be detected is too high or too low, the elastic contact piece 1 slides across the dividing line 230, and the circuit between the contact piece body 11 and the metal sheet 23 enters a conducting state, so that high-voltage or low-voltage alarm is triggered. Since the second contact 13 is provided in the present invention, it can be used as a contact for contacting the pressure alarm plate, and specifically, the present invention provides a preferred embodiment: the thick-film resistor disc 2 further comprises a metal sheet 23, the metal sheet 23 is arranged on the surface of the ceramic substrate 20, a dividing line 230 is arranged in the middle of the metal sheet 23, the metal sheets 23 on two sides of the dividing line 230 are electrically non-conductive, and the second contact 13 is in sliding connection with the metal sheet 23. The metal sheet 23 is arranged on the ceramic substrate 20, on one hand, a PCB substrate can be omitted, on the other hand, the metal sheet 23 and the metal wire 21 are positioned on the same side, the elastic contact sheet 1 can respectively realize sliding contact with the metal wire 21 and the metal sheet 23 through the first contact 12 and the second contact 13 only by inclining towards one side, and the contact performance is better.
The thick film resistor disc 2 is fixed on the bracket 3, and the elastic contact piece 1 is rotatably connected with the bracket 3. In particular, as a preferred embodiment, it further comprises a return hinge assembly 4 for rotatably connecting the elastic contact piece 1 with the bracket 3. As shown in fig. 6, the reset hinge assembly 4 includes a swing frame 41 and a reset spring 42, the swing frame 41 is rotatably connected to the support 3, the reset spring 42 connects the swing frame 41 to the support 3, and the contact body 11 is fixed to the swing frame 41 and has an extended portion 14 with an arc-shaped end at an end away from the first contact 12. In order to facilitate assembly, the invention provides a plugging mode which is convenient for rapidly fixing the elastic contact piece 1 and the swing frame 41, specifically, the swing frame 41 is provided with an embedded groove 411 and a clamping hook 412, the middle of the contact piece body 11 is provided with a clamping groove 15, the contact piece body 11 is clamped into the embedded groove 411, the extending part 14 penetrates through the embedded groove 411, and the clamping hook 412 is clamped into the clamping groove 15. Specifically, the base 6 and the spring cover 8 are fixed to each other and enclose a spring accommodating cavity, the spring 5 and the spring seat 7 are respectively arranged in the spring accommodating cavity, the support 3 is fixed to the spring cover 8, the spring seat 7 is arranged on the base 6, two ends of the spring 5 respectively support against the base 6 and the spring cover 8, the arc-shaped end portion of the extension portion 14 is slidably connected with the spring seat 7, and the swing frame 41 is provided with a rolling portion 413 and supports against the spring seat 7 through the rolling portion 413. The spring accommodating cavity is communicated with a pressure environment to be detected, and when the pressure changes, the spring seat 7 is pushed to move, so that the contact is driven to slide on the thick film resistor disc 2 through the rolling part 413. The present invention provides the plate-shaped extension 14 to be easily inserted into the insertion slot 411, thereby achieving a quick assembly.
Specifically, shell body 9 and spring housing 8 reciprocal anchorage just enclose synthetic support and hold the cavity, and elastic contact 1, thick film resistance card 2 and support 3 set up in the support holds the cavity.
As the circuit connection part, the electric connector further comprises a pole post 0, wherein the pole post 0 is fixed on the outer shell 9, and the metal wire 21 at the head is electrically connected with the pole post 0. Specifically, as a preferred embodiment, there are two terminals 0, one terminal 0 is electrically connected to the metal wire 21, the other terminal 0 is electrically connected to the metal sheet 23, and the elastic contact piece 1 is electrically connected to the outer shell 9.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a mechanical type pressure sensor, its includes elastic contact piece (1), thick film resistance piece (2) and support (3), wherein, thick film resistance piece (2) are fixed on support (3), thick film resistance piece (2) include ceramic substrate (20), a plurality of metal wire (21) and thick film resistance layer (22), are provided with a plurality of metal wire (21) on ceramic substrate (20) side by side, continuous coating thick film resistance layer (22) between adjacent metal wire (21), its characterized in that: the elastic contact piece (1) comprises a contact piece body (11), one end of the contact piece body (11) is rotatably connected with the support (3), the other end of the contact piece body is provided with two or more first contacts (12), and the two or more first contacts (12) are in sliding connection with metal wires (21) arranged side by side; the elastic contact piece (1) further comprises two or more second contacts (13), and the first contact (12) and the second contacts (13) are respectively positioned on two sides of the contact piece body (11); the thick-film resistor disc (2) further comprises a metal sheet (23), the metal sheet (23) is arranged on the surface of the ceramic substrate (20), a dividing line (230) is arranged in the middle of the metal sheet (23), the metal sheets (23) on two sides of the dividing line (230) are electrically non-conductive, and the second contact (13) is in sliding connection with the metal sheet (23).
2. The mechanical pressure sensor of claim 1, wherein: a plurality of metal wires (21) are arranged in a fan shape in sliding connection with the first contacts (12).
3. The mechanical pressure sensor of claim 1, wherein: the first contact (12) is arc-shaped and is formed by extending and bending the contact piece body (11) towards the ceramic substrate (20).
4. The mechanical pressure sensor of claim 1, wherein: still including hinge assembly (4) that resets, hinge assembly (4) that resets includes rocker (41) and reset spring (42), rocker (41) and support (3) rotatable coupling, and rocker (41) and support (3) are connected in reset spring (42), and contact body (11) are fixed with rocker (41) and are kept away from the one end of first contact (12) and be provided with tip for circular-arc extension (14).
5. The mechanical pressure sensor of claim 4, wherein: the swing frame (41) is provided with an embedded groove (411) and a clamping hook (412), a clamping groove (15) is formed in the middle of the contact piece body (11), the contact piece body (11) is clamped into the embedded groove (411), the extending part (14) penetrates through the embedded groove (411), and the clamping hook (412) is clamped into the clamping groove (15).
6. The mechanical pressure sensor of claim 4, wherein: still include spring (5), base (6), spring holder (7) and spring housing (8), base (6) and spring housing (8) reciprocal anchorage and enclose into a spring and hold the cavity, spring (5) and spring holder (7) set up respectively in the spring holds the cavity, support (3) are fixed with spring housing (8), spring holder (7) set up on base (6), base (6) and spring housing (8) are supported respectively at spring (5) both ends, circular-arc tip and spring holder (7) sliding connection of extension (14), be provided with roll portion (413) on rocker (41) and support through roll portion (413) and hold on spring holder (7).
7. The mechanical pressure sensor of claim 6, wherein: still include shell body (9), shell body (9) and spring housing (8) reciprocal anchorage and enclose synthetic support and hold the cavity, and elastic contact (1), thick film resistance card (2) and support (3) set up in the support holds the cavity.
8. The mechanical pressure sensor of claim 7, wherein: the electric pole is characterized by further comprising a pole column (0), wherein the pole column (0) is fixed on the outer shell (9), and the metal wire (21) located at the head is electrically connected with the pole column (0).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295396.6A CN111103085B (en) | 2019-12-16 | 2019-12-16 | Mechanical pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911295396.6A CN111103085B (en) | 2019-12-16 | 2019-12-16 | Mechanical pressure sensor |
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| Publication Number | Publication Date |
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| CN111103085A CN111103085A (en) | 2020-05-05 |
| CN111103085B true CN111103085B (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911295396.6A Active CN111103085B (en) | 2019-12-16 | 2019-12-16 | Mechanical pressure sensor |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000267802A (en) * | 1999-03-19 | 2000-09-29 | Kooa T & T Kk | Thick film circuit board for pointing stick |
| CN2831068Y (en) * | 2005-10-19 | 2006-10-25 | 万信超 | Pressure sensitive warner |
| CN201269770Y (en) * | 2008-07-21 | 2009-07-08 | 四平市汽车仪表有限公司 | Thick film resistor type liquid level sensor |
| CN201555637U (en) * | 2009-11-30 | 2010-08-18 | 浙江湖州新京昌电子有限公司 | Thick film circuit board of liquid and oil level sensor |
| CN104880236A (en) * | 2015-06-23 | 2015-09-02 | 浙江湖州新京昌电子有限公司 | Novel oil level sensor structure |
-
2019
- 2019-12-16 CN CN201911295396.6A patent/CN111103085B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000267802A (en) * | 1999-03-19 | 2000-09-29 | Kooa T & T Kk | Thick film circuit board for pointing stick |
| CN2831068Y (en) * | 2005-10-19 | 2006-10-25 | 万信超 | Pressure sensitive warner |
| CN201269770Y (en) * | 2008-07-21 | 2009-07-08 | 四平市汽车仪表有限公司 | Thick film resistor type liquid level sensor |
| CN201555637U (en) * | 2009-11-30 | 2010-08-18 | 浙江湖州新京昌电子有限公司 | Thick film circuit board of liquid and oil level sensor |
| CN104880236A (en) * | 2015-06-23 | 2015-09-02 | 浙江湖州新京昌电子有限公司 | Novel oil level sensor structure |
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| CN111103085A (en) | 2020-05-05 |
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