CN108199706B - Explosion-proof intrinsic safety type key and keyboard thereof - Google Patents
Explosion-proof intrinsic safety type key and keyboard thereof Download PDFInfo
- Publication number
- CN108199706B CN108199706B CN201711463921.1A CN201711463921A CN108199706B CN 108199706 B CN108199706 B CN 108199706B CN 201711463921 A CN201711463921 A CN 201711463921A CN 108199706 B CN108199706 B CN 108199706B
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- CN
- China
- Prior art keywords
- baffle
- key
- explosion
- cap
- spring
- Prior art date
- 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.)
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/90—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of galvano-magnetic devices, e.g. Hall-effect devices
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
Abstract
The invention discloses an explosion-proof intrinsic safety type key and a keyboard thereof, comprising a shell, a first baffle, a second baffle, a key, a spring and a circuit board, wherein a cylinder of the key extends outwards from the top to form a cap, the bottom end of the cap is bent outwards, and the bent part is used for being abutted against the inner side of the first baffle under the action of elasticity when the key is not pressed; the spring is sleeved on the column body, one end of the spring is abutted against the cap, and the other end of the spring is abutted against the upper surface of the second baffle; the bottom of the column body is provided with a magnet, and when the key is pressed, the column body penetrates through the second baffle and abuts against the upper surface of the shell and corresponds to the position of the Hall sensor on the circuit board on the other side of the shell. The invention adopts a novel explosion-proof isolation mode, improves the intrinsic safety characteristic, is convenient to maintain and replace, reduces the installation complexity and prolongs the service life of the keyboard.
Description
Technical Field
The invention relates to an explosion-proof intrinsic safety type device, in particular to an explosion-proof intrinsic safety type key and a keyboard thereof.
Background
Many devices require a human-computer interaction interface, and keyboards are the most common human-computer interaction modes, and the human-computer interaction interface can not be separated from the keyboard in the aspects of device control, parameter setting, instruction input and program debugging. Because the intrinsically safe equipment, namely the intrinsic safety equipment, is required to be used in special environments with explosion-proof requirements on oil gas, dust, dangerous chemicals and the like, the intrinsic safety keyboard has a good protection function while meeting the use function.
At present, most of the intrinsic safety equipment adopts intrinsic safety keyboards, wherein a layer of film or a structural member with holes is pressed on the keyboard by a long flange frame so as to achieve the purpose of protection. In order to prevent electric sparks possibly generated by the circuit board from being conducted to a dangerous field side, the length of the key needs to be made very long so as to achieve the purpose of explosion suppression, as shown in fig. 1. The design structure is complex, the cost is high, the assembly is difficult, the touch feeling of the keys is poor, the whole structure is very thick and the maintainability is greatly reduced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an explosion-proof intrinsic safety type key and a keyboard thereof, which simplify the structure of the intrinsic safety type key, enhance the isolation strength and reliability and prolong the service life of the key.
The technical scheme adopted by the invention is as follows:
the explosion-proof intrinsic safety type key comprises a shell, a first baffle, a second baffle, a key, a spring and a circuit board, wherein a cylinder of the key extends outwards from the top to form a cap, the bottom end of the cap is bent outwards, and the bent part is used for being abutted against the inner side of the first baffle under the action of elastic force when the key is not pressed; the spring is sleeved on the column body, one end of the spring abuts against the cap, and the other end of the spring abuts against the upper surface of the second baffle; and a magnet is arranged at the bottom of the column body, and when the key is pressed, the column body penetrates through the second baffle and abuts against the upper surface of the shell and corresponds to the position of the Hall sensor on the circuit board on the other side of the shell.
Preferably, when the bottom end of the column body abuts against the upper surface of the shell, the bent portion abuts against the upper surface of the second baffle, and the top of the cap is flush with the upper surface of the first baffle.
Preferably, the magnet is embedded in the bottom of the cylinder and is flush with the bottom of the cylinder.
Preferably, the column body is of a hollow structure.
Preferably, the housing has a groove structure, the first baffle and the second baffle are located in the groove, and the upper surface of the first baffle is flush with the top of the housing.
Preferably, one end of the spring is fixedly connected to the cap, and the other end of the spring is fixedly connected to the upper surface of the second baffle.
Preferably, the cap penetrates through the first baffle and is matched with the first baffle in shape; the column body penetrates through the second baffle and is matched with the second baffle in shape.
The explosion-proof intrinsic safety type keyboard comprises the explosion-proof intrinsic safety type keys.
Compared with the prior art, the invention has the beneficial technical effects that:
the explosion-proof intrinsic safety type key and the keyboard thereof meet the requirement of intrinsic safety protection, and the change of the output level of the Hall sensor caused by the change of the magnetic field is used for explosion-proof isolation, so that the intrinsic safety characteristic is improved; the invention simplifies the structure of the key and the keyboard, reduces the installation complexity, is convenient for maintenance and replacement, and prolongs the service life of the key and the keyboard.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a schematic structural diagram of a prior art intrinsic safety keyboard;
fig. 2 is a schematic structural diagram of an explosion-proof intrinsically safe key and a keyboard thereof according to an embodiment of the invention.
In the figure, 10-cap; 11-a column; 12-a spring; 13-a limit nut; 14-mechanical keys; 15-a circuit board; 30-a housing; 31-a first baffle; 32-a second baffle; 33-a cap; 34-a column; 35-a spring; 36-a magnet; 37-hall sensor; 38-circuit board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2, the explosion-proof intrinsically safe key comprises a shell 30, a first baffle 31, a second baffle 32, a key, a spring 35 and a circuit board 38, wherein a column 34 of the key extends outwards from the top to form a cap 33, the bottom end of the cap 33 is bent outwards, and the bent part is used for being abutted against the inner side of the first baffle 31 under the action of elastic force when the key is not pressed; the spring 35 is sleeved on the column 34, one end of the spring abuts against the cap 33, and the other end of the spring abuts against the upper surface of the second baffle 32; the bottom of the column 34 is provided with a magnet 36, and when the key is pressed, the column 34 passes through the second baffle 32 and abuts against the upper surface of the shell 30, and corresponds to the position of a hall sensor 37 on a circuit board 38 positioned on the other side of the shell 30. In this embodiment, the button and the circuit board 38 are physically isolated by the housing 30, and the hall sensors 37 on the button and the circuit board 38 are located at corresponding positions on both sides of the housing 30; when the key is pressed, the magnet 36 at the bottom of the column 34 is close to the hall sensor 37, and the hall sensor 37 senses the change of the magnetic field to change the output level; when the key is released, the key is restored to the original state by the elastic force of the spring 35.
In one embodiment of the present invention, when the bottom end of the column 34 abuts on the upper surface of the housing 30, the bent portion abuts on the upper surface of the second baffle 32, and the top of the cap 33 is flush with the upper surface of the first baffle 31. In this design, the bent portion abuts against the upper surface of the second baffle 32, which plays a role in limiting on one hand, and the bottom end of the coordinately-matched column 34 abuts against the upper surface of the housing 30 on the other hand.
In one embodiment of the present invention, the magnet 36 is embedded in the bottom of the column 34 and is flush with the bottom of the column 34. In this design, the magnet 36 and the column 34 are connected in an interference fit manner, which serves to secure the magnet 36.
In one embodiment of the present invention, the column 34 is a hollow structure. In this design, the hollow column 34 facilitates opening the mold and is beneficial to maintaining the structural uniformity of the column 34.
In one embodiment of the present invention, the housing 30 has a groove structure, the first baffle 31 and the second baffle 32 are located in the groove, and the upper surface of the first baffle 31 is flush with the top of the housing 30. In this design, the first blocking plate 31 and the second blocking plate 32 are detachably disposed in the groove of the housing 30, and the first blocking plate 31 and the second blocking plate 32 may be fixedly connected, and the first blocking plate 31 is fixed on the housing 30 by screws, but not limited thereto.
In one embodiment of the present invention, one end of the spring 35 is fixedly coupled to the cap 33 and the other end is fixedly coupled to the upper surface of the second shutter 32. The design is to increase the stability of the connection of the spring 35, thereby ensuring the stability of the key pressing process.
In one embodiment of the present invention, the cap 33 penetrates the first baffle 31 and is adapted to the shape of the first baffle 31; the post 34 extends through the second baffle 32 and conforms to the shape of the second baffle 32. In this design, the cap 33 may be rectangular, circular, oval or any other configuration, and the first baffle 31 is provided with a through hole of corresponding shape, which is in clearance fit with the cap 33. The post 34 may be rectangular, circular, oval or any other configuration, and the second baffle 32 may have a correspondingly shaped through hole that is a clearance fit with the post 34.
The invention also provides an explosion-proof intrinsic safety type keyboard, and the explosion-proof intrinsic safety type key is used.
In one embodiment of the present invention, the magnetic buttons and the hall sensors 37 are physically isolated by the housing 30 and arranged in a one-to-one correspondence, which serves to isolate and protect against explosion.
In one embodiment of the present invention, the first barrier 31, the second barrier 32, the housing 30, and the wiring board 38 are assembled together by structural members.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The explosion-proof intrinsic safety type key is characterized by comprising a shell, a first baffle, a second baffle, a key, a spring and a circuit board, wherein a cylinder of the key extends outwards from the top to form a cap, the bottom end of the cap is bent outwards, and the bent part is used for being abutted against the inner side of the first baffle under the action of elasticity when the key is not pressed; the spring is sleeved on the column body, one end of the spring abuts against the cap, and the other end of the spring abuts against the upper surface of the second baffle; the bottom of the column body is provided with a magnet, when the key is pressed, the column body penetrates through the second baffle to abut against the upper surface of the shell and corresponds to the position of the Hall sensor on the circuit board positioned on the other side of the shell;
when the bottom butt of cylinder is in the upper surface of casing, the kink butt is in the upper surface of second baffle, the top of block with the upper surface parallel and level of first baffle.
2. The explosion-proof intrinsically safe button of claim 1, wherein the magnet is embedded in and flush with the bottom of the cylinder.
3. The explosion proof intrinsically safe button of claim 1, wherein the cylinder is of hollow construction.
4. The explosion proof intrinsically safe key of claim 1, wherein the housing is of a recessed configuration, the first and second baffles are positioned within the recess, and an upper surface of the first baffle is level with a top of the housing.
5. An explosion proof intrinsically safe key as claimed in claim 1 wherein one end of the spring is fixedly connected to the cap and the other end is fixedly connected to the upper surface of the second barrier.
6. An explosion proof intrinsically safe key as claimed in claim 1 wherein the cap extends through the first barrier and conforms to the shape of the first barrier; the column body penetrates through the second baffle and is matched with the second baffle in shape.
7. An explosion-proof intrinsically safe keyboard comprising an explosion-proof intrinsically safe key as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711463921.1A CN108199706B (en) | 2017-12-28 | 2017-12-28 | Explosion-proof intrinsic safety type key and keyboard thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711463921.1A CN108199706B (en) | 2017-12-28 | 2017-12-28 | Explosion-proof intrinsic safety type key and keyboard thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108199706A CN108199706A (en) | 2018-06-22 |
| CN108199706B true CN108199706B (en) | 2021-02-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711463921.1A Active CN108199706B (en) | 2017-12-28 | 2017-12-28 | Explosion-proof intrinsic safety type key and keyboard thereof |
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| Country | Link |
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| CN (1) | CN108199706B (en) |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3335280B2 (en) * | 1996-09-10 | 2002-10-15 | 新晃電機株式会社 | Pushbutton switch and pushbutton switch device using the pushbutton switch |
| CN2391962Y (en) * | 1999-10-13 | 2000-08-16 | 冯文佳 | Push key type puzzle anti-theft lock |
| CN2518211Y (en) * | 2002-01-16 | 2002-10-23 | 游聪谋 | Switch structure able to regulate resilience |
| CN2561076Y (en) * | 2002-06-04 | 2003-07-16 | 达方电子股份有限公司 | Key cap with multi-layer structure |
| CN2672833Y (en) * | 2003-12-05 | 2005-01-19 | 张圣光 | Double push-buttom type on-and-off switch |
| DE102004054617B3 (en) * | 2004-11-11 | 2006-05-11 | Zf Friedrichshafen Ag | Actuation device with buttons |
| EP2282318B1 (en) * | 2009-07-29 | 2016-06-29 | Electrolux Home Products Corporation N.V. | Push button switch assembly |
| CN202217604U (en) * | 2011-09-28 | 2012-05-09 | 机械工业第三设计研究院 | Energy-saving illumination switch with fire-fighting forcible startup function |
| CN203617183U (en) * | 2013-12-04 | 2014-05-28 | 湖南威铭能源科技有限公司 | Waterproof keyboard of intelligent water meter |
| CN204596682U (en) * | 2015-04-27 | 2015-08-26 | 马鞍山市牛魔王科技发展有限公司 | A kind of insertion type Multifunctional electromagnetic shielding keyboard |
| CN106910657B (en) * | 2017-04-10 | 2019-07-19 | 合肥梦飞电器有限公司 | Two-way button |
| CN206595180U (en) * | 2017-04-11 | 2017-10-27 | 东莞市凯龙硅胶制品有限公司 | A kind of macromolecule silica gel electronic key |
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2017
- 2017-12-28 CN CN201711463921.1A patent/CN108199706B/en active Active
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| Publication number | Publication date |
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| CN108199706A (en) | 2018-06-22 |
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