CN110689782A - Multilayer push-and-pull rod drive type electromagnetic braille point display device - Google Patents
Multilayer push-and-pull rod drive type electromagnetic braille point display device Download PDFInfo
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- CN110689782A CN110689782A CN201910983011.9A CN201910983011A CN110689782A CN 110689782 A CN110689782 A CN 110689782A CN 201910983011 A CN201910983011 A CN 201910983011A CN 110689782 A CN110689782 A CN 110689782A
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- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B21/00—Teaching, or communicating with, the blind, deaf or mute
- G09B21/001—Teaching or communicating with blind persons
- G09B21/003—Teaching or communicating with blind persons using tactile presentation of the information, e.g. Braille displays
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Abstract
A multilayer push-pull rod driving type electromagnetic braille display device comprises a main body module, an ejector pin, a cover plate, a push-pull rod and an actuator, wherein for a six-point braille display device, the main body module is formed by superposing three flat plates with transverse and longitudinal vertical crossed holes inside, for an eight-point braille display device, the main body module is formed by four layers of flat plates, when the push-pull rod is pushed inwards in a push-pull rod mounting hole, and when the ejector pin reaches an upper stop point, the upper end of the head of the ejector pin is higher than the upper plane of the cover plate to form a 'convex point' of braille characters; when the push-pull rod is pulled out from the push-pull rod mounting hole, the thimble is positioned at the lower dead center until the lower edge of the annular flange of the thimble is contacted with the upper surface of the main body module, and the head of the thimble is flush with the upper plane of the cover plate to form a 'flat point' of the braille characters. The invention provides a multilayer push-pull rod driving type electromagnetic braille pointing device which is suitable for generating braille characters of all languages and all forms.
Description
Technical Field
The invention relates to the technical field of mechanical engineering and electronic engineering, in particular to a multilayer push-pull rod driving type electromagnetic braille point display device.
Background
According to statistics of World Health Organization (WHO), 3900 ten thousand of blind people exist around the world, the number of blind people increases year by year, and 600 more than ten thousand of blind people exist in China. For such a large and important group of blind people, the society needs to give care and support to them, and at the same time, they also need to obtain good learning environment and cultural education urgently.
The blind people can not study and read like ordinary people, the reading modes of the blind people comprise auditory reading and touch reading, the touch reading by fingers has high reading speed and good information discrimination, is a course which needs to be taught by a blind school, is one of the fields which need to be mastered for the blind people to communicate with the outside and interpersonal, and is a main way for the blind people to acquire knowledge and information at the present stage.
However, the number of blind people who master braille is very small, mainly because the braille bearing body is limited, learning places and learning tools cannot be popularized, for example, braille books are main publications which blind people appreciate and read, but the number is small, the manufacturing period is long, special paper is expensive, the working procedures are various and complicated, the price is high, the information is delayed, the information amount is small, the size is heavy, and the braille book is very inconvenient to carry. With the progress of society and the development of science and technology, the reading and learning convenience of the blind is improved, and the blind is more and more emphasized by developed countries in the world, and various reading devices for the blind are continuously appeared.
The braille is the literal character specially for blind people to read and write, and the braille book and braille reading device are the displaying carrier of braille. The characters commonly used by Braille all over the world are produced in 1824, and are a system of salient point Braille characters created by Louis Braille of the law, and China also has the national standard of Braille (GB/T15720-2008). The Braille contact driving device is an important component of Braille learning and reading machinery, and researchers at home and abroad research and develop Braille contact driving mechanisms in different driving modes based on different principles, wherein the Braille contact driving mechanisms mainly comprise driving modes such as piezoelectric ceramics, electrical stimulation, memory alloy, pneumatics, temperature control, electromagnetism and other novel materials.
Although scholars at home and abroad develop Braille point display devices in various driving modes, the Braille point display driving mechanism which is successfully applied at present only has a piezoelectric ceramic type. The piezoelectric ceramic braille point display device has low power consumption, high refreshing speed and light weight, can provide larger supporting force, but also has the following defects: the production and processing technology is complicated, the manufacturing cost of parts is high, and the popularization of the piezoelectric ceramic type braille point display is limited, so researchers pay more attention to the research and development of the electromagnetic type braille point display. The electromagnetic type braille point shows at present mainly utilizes solenoid to have the circular telegram and produce the magnetic field, the disappearance characteristic of outage magnetic field, drives the arch and the decline of braille contact, forms the braille character, has that refresh frequency is fast, the reliability is high, the price is preferential, be convenient for make and maintain, can provide advantages such as great holding power simultaneously, but whole device electric current demand is big, the consumption is high, need install cooling device additional, and the volume is great, needs make big improvement to theory of operation and component structure.
Disclosure of Invention
In order to overcome the defects of the existing Braille contact driving mechanism, the invention provides a multilayer push-pull rod driving type electromagnetic Braille point display device which is suitable for generating Braille characters of all languages and all forms.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a multilayer push-pull rod driving type electromagnetic Braille point display device comprises a main body module, thimbles, a cover plate, push-pull rods and an actuator, wherein the cover plate is arranged above the main body module and is detachably connected with the main body module; for the eight-point Braille display device, the main body module is composed of four layers of flat plates, vertical holes are arranged on each layer of flat plate, the flat plates are in four rows and multiple columns and penetrate through the flat plates from top to bottom, and after the four layers of flat plates are overlapped together, the vertical holes are aligned by a central line to form a thimble mounting hole; a row of horizontal holes are arranged on the side surface of each layer of flat plate in the front-back direction and are push-pull rod mounting holes for mounting push-pull rods, the central lines of the push-pull rod mounting holes are vertically intersected with the central lines of the rows of thimble mounting holes, and meanwhile, each push-pull rod mounting hole is respectively communicated with the corresponding thimble mounting hole;
the middle part of the cover plate is provided with stepped holes which are as many as the thimble mounting holes and are thin at the top and thick at the bottom, and each stepped hole is coaxially opposite to the corresponding thimble mounting hole; the number of the thimbles is the same as that of the thimble mounting holes, the thimbles are respectively mounted in the corresponding thimble mounting holes and the corresponding stepped holes in a one-to-one correspondence manner, and each thimble is in clearance fit with the thimble mounting holes and the stepped holes; the ejector pins are respectively installed into the ejector pin installation holes from the upper part of the main body module and are located on the upper surface of the main body module by the aid of self gravity of the annular flanges of the ejector pins; push-pull rods with the same number as the rows of thimbles are arranged below each row of thimbles;
the push-pull rod comprises a curved surface contour and a rod body, wherein the curved surface contour is used for enabling the ejector pin to be located at the lower dead point and driving the ejector pin to move from the lower dead point to the upper dead point, the rod body is used for enabling the ejector pin to be located at the upper dead point and matched with the push-pull rod mounting hole, and the bottom of each ejector pin is always in contact with the corresponding push-pull rod; the push-pull rod below each thimble can be arranged in the corresponding push-pull rod mounting hole in a back-and-forth movement manner, each push-pull rod is driven by an actuator, and each push-pull rod uniquely controls the lifting movement of the corresponding thimble;
the actuator is used for generating pushing force and pulling force on the push-pull rod, the push-pull rod can move back and forth in the push-pull rod mounting hole under the action of the actuator, when the push-pull rod is pushed inwards in the push-pull rod mounting hole, the bottom of the ejector pin is gradually lifted up by the push-pull rod, and when the ejector pin reaches a top dead center, the upper end of the head of the ejector pin is higher than the upper plane of the cover plate to form a 'convex point' of the Braille character; when the push-pull rod is pulled out outwards in the push-pull rod mounting hole, the ejector pin moves downwards along the ejector pin mounting hole under the action of self gravity until the lower edge of the annular flange of the ejector pin is contacted with the upper surface of the main body module, the ejector pin is positioned at the lower stop point, and the head of the ejector pin is flush with the upper plane of the cover plate to form a 'flat point' of the Braille character; the lift of the thimble is the distance between the upper and lower dead points of the thimble, namely the height of the 'salient point' of the Braille character.
Furthermore, the thimble consists of a head part forming a contact, an annular flange playing a positioning role, a cylindrical rod body and a hemispherical bottom part, wherein the annular flange is arranged in the middle of the cylindrical rod body, the whole thimble is a rotating body, the head part of the thimble is positioned in a fine hole of a stepped hole of the cover plate, and a convex point of the Braille contact is generated when the thimble rises; the annular flange of the thimble is positioned in the thick hole of the stepped hole, the thickness of the annular flange of the thimble is smaller than the height of the thick hole, the axial clearance is ensured to be larger than the required contact height, and the lower part of the cylindrical rod body is inserted into the thimble mounting hole of the main body module and is in clearance fit with the thimble mounting hole.
And furthermore, the push-pull rod mounting holes on each layer of flat plate of the main body module are arranged in a row, and the push-pull rod mounting holes on two adjacent layers of flat plates are arranged in a staggered manner.
Furthermore, the push-pull rod is a rotating body as a whole, the push-pull rods are arranged on the front side and the rear side of each layer of flat plate, each push-pull rod can be independently pushed and pulled back and forth in the corresponding push-pull rod mounting hole, the push-pull rod comprises two structures, the first push-pull rod comprises a trapezoidal circular table, a cylindrical rod body, a circular flange and a tail part with a circular hole at one end, the second push-pull rod comprises a trapezoidal circular table, a cylindrical rod body and a circular flange, and the central hole of the circular flange of the structure is a circular hole for mounting the permanent magnet;
when the push-pull rod is pushed along the push-pull rod mounting hole, the side face of the trapezoidal circular truncated cone is in contact with the bottom of the ejector pin and gradually pushes the ejector pin to ascend until the circular flange of the push-pull rod is in contact with the side face of the flat plate, the bottom of the ejector pin is completely positioned on the cylindrical rod body of the push-pull rod, the ejector pin is positioned at the top dead center and presents a Braille 'convex point' on the cover plate, when the push-pull rod is pulled out along the push-pull rod mounting hole, the bottom of the ejector pin descends along the side face of the trapezoidal circular truncated cone until the ejector pin is separated from the trapezoidal circular truncated cone, the ejector pin is positioned on the main body module by the circular flange of the ejector pin, the ejector.
And furthermore, positioning pin holes are formed in the flat plate and the cover plate, the positioning pin holes of the flat plate and the cover plate correspond to each other up and down, and the cover plate and the main body module are fixedly connected together through interference fit of the positioning pins and the positioning pin holes.
Still further, the actuator comprises a permanent magnet, a solenoid and a cylindrical mandrel, wherein the solenoid is sleeved on the cylindrical mandrel and fixed with the cylindrical mandrel by heat-resistant glue; for the first type of push-pull rod, the permanent magnet is arranged in a circular hole at the tail part of the push-pull rod and is inserted into the solenoid along with the tail part of the push-pull rod, when the push-pull rod is pulled out, the push-pull rod is limited by a circular flange of the push-pull rod, the cylindrical mandrel is arranged on the bracket, a small gap is reserved between the end part of the cylindrical mandrel and the end surface of the permanent magnet, and the cylindrical mandrel is ensured to be magnetized by the internal magnetic field of the solenoid and not magnetized by; for the second type of push-pull rod, the permanent magnet is mounted in a circular hole of an annular flange, the annular flange is located outside the solenoid and corresponds to a cylindrical spindle inside the solenoid, and the cylindrical spindle and the permanent magnet are kept at least a non-magnetized distance.
And furthermore, a magnetizer is arranged in a gap between the solenoids, the magnetizer and the cylindrical core shaft are arranged on the bracket together, and the cylindrical core shaft, the bracket and the magnetizer form a magnetic circuit, so that the magnetic field intensity inside the solenoids is increased.
And furthermore, the upper side and the lower side of each bracket are respectively provided with a wiring board, the upper part and the lower part of each bracket are also provided with threaded holes for fixing the wiring boards by screws, and the wire heads of the solenoids are welded on the wiring boards.
Furthermore, the solenoid is in a framework form, the framework is hollow, flanges are arranged at two ends of the framework, the solenoid body is wound on the framework, when the push-pull rod is pulled out, the circular flange of the push-pull rod is contacted with the flange at the end part of the framework, and the flange at the end part of the framework plays a role in limiting the push-pull rod;
the cylindrical mandrel is made of semi-hard magnetic materials or rectangular magnetic materials, and after the cylindrical mandrel is inserted into the solenoid, the end part of the mandrel is lower than the end face of the solenoid framework flange, so that the mandrel is ensured not to be magnetized by the permanent magnet.
Furthermore, the front and the back of the cover plate extend to the support, threaded holes are formed in the cover plate, and the support and the cover plate are connected together through screws.
The invention has the following beneficial effects: the device realizes push-pull action on the push-pull rod through the actuator when the solenoid is electrified, so that the thimble is driven to move up and down to form different arrays of Braille contacts, the solenoid is powered off after each Braille array is refreshed, and the action of the push-pull rod driving the thimble is kept unchanged because the solenoid mandrel still keeps enough residual magnetism, and the formed Braille contacts are mechanically and electromagnetically locked; the main body module consists of three layers of flat plates, and each layer of flat plate is thinner and is convenient to mount and process; the contact pin is arranged in the thimble mounting hole on the main body module through the annular flange seat on the contact pin, so that the operation is more stable and light; the braille reader or the braille point display is easy to popularize and popularize, and has good social benefit and application value.
Drawings
FIG. 1 is a structural assembly view of a six-dot Braille display device according to an embodiment.
Fig. 2 is a flat plate schematic view of a constituent body module of the six-dot braille display device.
FIG. 3 is a schematic view of a cover plate of a six-dot Braille display device.
Fig. 4 is a structural view of the thimble.
Fig. 5 is a structural view of the push-pull rod.
Fig. 6 is a structural view of another push-pull rod.
Fig. 7 is a side view of the present invention.
Fig. 8 is a solenoid structural view.
FIG. 9 is a schematic view of a cylindrical mandrel within a solenoid.
Fig. 10 is a structural view of the magnetizer.
Fig. 11 is a structural view of the stent.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 11, the invention relates to a multilayer push-pull rod driving type electromagnetic braille display device, which is suitable for manufacturing a six-point braille display device and an eight-point braille display device, and comprises a main body module 1, a push-pull rod 2, a thimble 3, a cover plate 4 and an actuator 5, wherein for the six-point braille display device, the main body module 1 is formed by superposing three flat plates which are internally provided with transverse and longitudinal vertical crossed holes, each flat plate 10 is provided with vertical holes which are arranged in three rows and multiple columns and penetrate up and down, and after the three flat plates are superposed together, the vertical holes are aligned by a central line to form a thimble mounting hole 101 for mounting the thimble 3. A row of horizontal holes are arranged on the side face of the flat plate in the front-back direction and are push-pull rod mounting holes 102 for mounting the push-pull rod 2, and the central line of the push-pull rod mounting holes 102 is vertically intersected with the central line of the thimble mounting holes 101. Meanwhile, each push-pull rod mounting hole is respectively communicated with a corresponding thimble mounting hole; the thimbles 3 are respectively installed into the thimble installation holes 101 from the upper part of the main body module 1, and are located on the upper surface of the main body module 1 by the self gravity of the annular flanges 301 of the thimbles 3, and the lower body parts 302 of the thimbles 3 are in clearance fit with the thimble installation holes 101. The middle part of the cover plate 4 is provided with stepped holes 401 which are as many as the thimble mounting holes and are thin at the top and thick at the bottom, and the stepped holes are coaxially opposite to the thimble mounting holes respectively. The flat plate 10 is provided with a positioning pin hole 103, the cover plate is also provided with a corresponding positioning pin hole, and the cover plate 4 and the main body module 1 are fixedly connected together by means of interference fit of the positioning pin and the positioning pin hole. The annular flange 301 of the thimble 3 is just arranged in the thick hole of the stepped hole 401 of the cover plate 4, and a margin for moving up and down is reserved. The actuator 5 is used for generating pushing force and pulling force on the push-pull rod 2, the push-pull rod 2 can move back and forth in the push-pull rod mounting hole 102 under the action of the actuator 5, when the push-pull rod 2 is pushed inwards in the push-pull rod mounting hole 102, the bottom 303 of the thimble 3 is gradually lifted up by the push-pull rod 2, and when the thimble 3 reaches a top dead center, the head 304 of the thimble is higher than the upper plane of the cover plate 4 to form a 'salient point' 306 of the braille characters; when the push-pull rod 2 is pulled out from the push-pull rod mounting hole 102, the thimble 3 moves downwards along the thimble mounting hole 101 under the action of self gravity until the lower edge of the thimble annular flange 301 contacts with the upper surface of the main body module 1, at the moment, the thimble 3 is at the bottom dead center, the head 304 of the thimble is flush with the upper plane of the cover plate 4, and a 'flat point' 305 of the braille characters is formed; the lift of the thimble 3 is the distance between the upper and lower dead points of the thimble, namely the height of the 'salient point' of the braille character.
Further, as for the eight-dot braille display device, compared with the six-dot braille display device, the main body module 1 has one more flat plate 10, that is, four flat plates, the upper and lower through holes of each flat plate are arranged in four rows and multiple columns, the stepped holes 401 of the cover plate are also arranged in four rows and multiple columns, and the shapes of the ejector pins 3, the push-pull rod 2, the structure of the actuator 5, and the working principle of the device are completely the same.
The thimble 3 is composed of a head 304 constituting a contact point, an annular flange 301 for positioning, a cylindrical shaft 302, and a bottom 303 having a hemispherical shape, and the thimble 3 is a body of revolution as a whole, which is allowed to rotate in the mounting hole 101. The thimble head 304 is located within a fine hole of the stepped hole 401 of the cover 4, which generates a bump of braille contacts when raised. The annular flange 301 of the thimble is positioned in a thick hole of the stepped hole 401, the thickness of the annular flange 301 of the thimble is smaller than the height of the thick hole, the axial clearance is ensured to be larger than the required contact height, and the annular flange 301 plays a role in limiting the lifting of the thimble, so that the thimble 3 does not fall off from the thimble mounting hole 101 when the device is inverted. The lower part of the cylindrical shaft is inserted into the thimble mounting hole 101 of the main body module 1 to play a guiding role. The thimble bottom 303 is hemispherical, so that the rising rule of the thimble 3 under the action of the push-pull rod 2 cannot be changed when the thimble 3 rotates in the thimble mounting hole 101.
The push-pull rod 2 pushing the thimble 3 to rise is a rotator as a whole to allow rotation in the push-pull rod mounting hole 102, the push-pull rod 2 is arranged at the front side and the rear side of each flat plate 10, each push-pull rod 2 can be independently pushed and pulled back and forth in the corresponding push-pull rod mounting hole 102, the push-pull rod 2 is composed of a trapezoidal circular truncated cone 201, a cylindrical rod body 202, a circular flange 203 and a tail part 204 with a round hole 205 at one end, when the push-pull rod 2 is pushed along the mounting hole 102, the side surface of the trapezoidal circular truncated cone 201 is in contact with a thimble bottom hemispheroid 303 and pushes the thimble 3 to rise step by step until the end part of the circular flange 203 is in contact with the side surface of the flat plate 10, the thimble bottom 303 is completely positioned on the cylindrical rod body 202, the thimble 3 is positioned at the top dead center and presents a braille 'salient point' on the cover plate 4, when the push-pull, the thimble 3 is located on the main body module 1 by virtue of the annular flange 301, the thimble 3 is positioned at the lower dead point, and the head 304 of the thimble is flush with the upper surface of the cover plate 4 to form a 'flat point' of braille.
The flat plate 10, the cover plate 4, the thimble 3 and the push-pull rod 2 which form the main body module 1 are all made of non-magnetic materials such as aluminum alloy, plastic or stainless steel.
The actuator 5 is used for generating pushing force or pulling force on the push-pull rod 2, the actuator 5 is composed of a permanent magnet, a solenoid 502 and a cylindrical mandrel 503, and meanwhile, in order to finish the action of generating the pushing force or the pulling force, the two structural designs are provided, the first structural characteristic is that the permanent magnet is installed in a circular hole 205 of the tail part 204 of the push-pull rod and is inserted into the solenoid 502 along with the tail part 204 of the push-pull rod, when the push-pull rod 2 is pulled out, a circular flange 203 of the push-pull rod is used for limiting, the cylindrical mandrel 503 is installed on the iron support 6, a tiny gap is reserved between the end part of the mandrel 503 and the end surface of the permanent magnet, the cylindrical mandrel 503 is ensured to be magnetized by the magnetic field inside the solenoid 502 and is not magnetized by the permanent magnet; the second structural characteristic is that the tail part 204 of the push-pull rod 2 is removed, the permanent magnet mounting hole is opened in the circular flange 203 and is positioned outside the solenoid 502 and corresponds to the cylindrical core shaft 503 inside the solenoid, the core shaft 503 and the permanent magnet at least keep a non-magnetized distance, and the solenoid 502 is sleeved on the cylindrical core shaft 503 and fixed with heat-resistant glue. The working principle of the actuator 5 is that when the magnetic field of the coil is reversed under the action of forward and reverse currents of the solenoid, the magnetic field of the coil interacts with the permanent magnet, and therefore pushing force or pulling force is generated on the push-pull rod.
Further, the push-pull rod mounting holes 102 on each flat plate of the main body module 1 are arranged in a row, but the push-pull rod mounting holes on two adjacent flat plates are arranged in a staggered manner, so that the space is saved.
Furthermore, the head 304 of the thimble 3 adopts a hemisphere or a parabolic rotating curved surface outline shape, so that the blind can conveniently touch with fingers; the bottom 303 of the thimble 3 can also adopt other shapes and structures which are convenient to match with the trapezoidal round platform 201 at the end part of the push-pull rod.
Still further, the solenoid 502 is in the form of a skeleton, a skeleton central hole 506 is formed in the skeleton 504, flanges 505 are formed at two ends of the skeleton 504, the skeleton 504 supports the solenoid, when the push-pull rod 2 is pulled out, the annular flange 203 of the push-pull rod is in contact with the skeleton end flange 505, and the skeleton end flange limits the push-pull rod 2.
The cylindrical mandrel 503 of the solenoid adopts semi-hard magnetic material or rectangular magnetic material, so that the cylindrical mandrel 503 is magnetized when the solenoid 502 is electrified, and after the solenoid is powered off, strong residual magnetism still exists in the cylindrical mandrel 503, so that pushing force or pulling force is continuously kept on the permanent magnet 501, and a magnetic locking effect is achieved on the push-pull rod 2. After the cylindrical mandrel 503 is inserted into the solenoid, the end of the mandrel is lower than the end face of the solenoid frame flange 505 to ensure that the cylindrical mandrel 503 is not magnetized by the permanent magnet.
Furthermore, a magnetizer 7 is arranged in a gap between the solenoids, the magnetizer 7 and the solenoid mandrel 503 are installed on the bracket 6 together, and the cylindrical mandrel 503, the bracket 6 and the magnetizer 7 form a magnetic circuit, so that the magnetic field intensity inside the solenoid 502 is increased. The four sides of the magnetizer 7 are all arc concave surfaces which are inwards concave.
Furthermore, the front side and the rear side of the main body module 1 are respectively provided with a bracket 6, the bracket 6 is made of iron material, the function of the bracket is that besides the side surface is provided with the solenoid mandrel 503 and the magnetizer 7, the upper part and the lower part of the bracket are also provided with threaded holes 603, the wiring board 8 is fixed by screws, and the wire head of the solenoid 502 is welded on the wiring board 8. 601 is a hole for installing the cylindrical mandrel 503, and 602 is a hole for installing the magnetizer 7. Both the upper and lower holes on the sides of the bracket are 601, and the middle one is arranged with holes 601 and 602 alternately.
Furthermore, the front and the back of the cover plate 4 extend to the support 6, the cover plate 4 is provided with a threaded hole, the wiring board 8 is also provided with a through hole, and the support 6 and the cover plate 4 are fixed together by passing a screw through the threaded hole in the cover plate and the through hole in the wiring board, so that the whole device is connected into a whole.
Because the thimble 3, the push-pull rod 2 and the actuator 5 of the device all work independently, a contact array consisting of convex points and flat points can be generated on the cover plate 4, and the contact array can realize the display of braille according to the braille coding rule of each country. The invention can display one square of the braille points, and can also expand the braille points to realize multi-square display or multi-row display.
It should be noted that the two specific embodiments in this specification are only illustrative of the present invention and are not limited to the scope of the present invention, and any insubstantial changes or modifications are within the scope of the present invention.
Claims (10)
1. The utility model provides a multilayer push-and-pull rod drive formula electromagnetism braille point shows device which characterized in that: the six-point Braille display device comprises a main body module, thimbles, a cover plate, a push-pull rod and an actuator, wherein the cover plate is arranged above the main body module and is detachably connected with the main body module; for the eight-point Braille display device, the main body module is composed of four layers of flat plates, vertical holes are arranged on each layer of flat plate, the flat plates are in four rows and multiple columns and penetrate through the flat plates from top to bottom, and after the four layers of flat plates are overlapped together, the vertical holes are aligned by a central line to form a thimble mounting hole; a row of horizontal holes are arranged on the side surface of each layer of flat plate in the front-back direction and are push-pull rod mounting holes for mounting push-pull rods, the central lines of the push-pull rod mounting holes are vertically intersected with the central lines of the rows of thimble mounting holes, and meanwhile, each push-pull rod mounting hole is respectively communicated with the corresponding thimble mounting hole;
the middle part of the cover plate is provided with stepped holes which are as many as the thimble mounting holes and are thin at the top and thick at the bottom, and each stepped hole is coaxially opposite to the corresponding thimble mounting hole; the number of the thimbles is the same as that of the thimble mounting holes, the thimbles are respectively mounted in the corresponding thimble mounting holes and the corresponding stepped holes in a one-to-one correspondence manner, and each thimble is in clearance fit with the thimble mounting holes and the stepped holes; the ejector pins are respectively installed into the ejector pin installation holes from the upper part of the main body module and are located on the upper surface of the main body module by the aid of self gravity of the annular flanges of the ejector pins; push-pull rods with the same number as the rows of thimbles are arranged below each row of thimbles;
the push-pull rod comprises a curved surface contour and a rod body, wherein the curved surface contour is used for enabling the ejector pin to be located at the lower dead point and driving the ejector pin to move from the lower dead point to the upper dead point, the rod body is used for enabling the ejector pin to be located at the upper dead point and matched with the push-pull rod mounting hole, and the bottom of each ejector pin is always in contact with the corresponding push-pull rod; the push-pull rod below each thimble can be arranged in the corresponding push-pull rod mounting hole in a back-and-forth movement manner, each push-pull rod is driven by an actuator, and each push-pull rod uniquely controls the lifting movement of the corresponding thimble;
the actuator is used for generating pushing force and pulling force on the push-pull rod, the push-pull rod can move back and forth in the push-pull rod mounting hole under the action of the actuator, when the push-pull rod is pushed inwards in the push-pull rod mounting hole, the bottom of the ejector pin is gradually lifted up by the push-pull rod, and when the ejector pin reaches a top dead center, the upper end of the head of the ejector pin is higher than the upper plane of the cover plate to form a 'convex point' of the Braille character; when the push-pull rod is pulled out outwards in the push-pull rod mounting hole, the ejector pin moves downwards along the ejector pin mounting hole under the action of self gravity until the lower edge of the annular flange of the ejector pin is contacted with the upper surface of the main body module, the ejector pin is positioned at the lower stop point, and the head of the ejector pin is flush with the upper plane of the cover plate to form a 'flat point' of the Braille character; the lift of the thimble is the distance between the upper and lower dead points of the thimble, namely the height of the 'salient point' of the Braille character.
2. The multilayer push-pull rod driven electromagnetic braille display device according to claim 1, characterized in that: the thimble consists of a head part forming a contact, an annular flange playing a positioning role, a cylindrical rod body and a hemispherical bottom part, wherein the annular flange is arranged in the middle of the cylindrical rod body, the thimble is integrally a rotating body, the head part of the thimble is positioned in a fine hole of a stepped hole of the cover plate, and a convex point of the Braille contact is generated when the thimble rises; the annular flange of the thimble is positioned in the thick hole of the stepped hole, the thickness of the annular flange of the thimble is smaller than the height of the thick hole, the axial clearance is ensured to be larger than the required contact height, and the lower part of the cylindrical rod body is inserted into the thimble mounting hole of the main body module and is in clearance fit with the thimble mounting hole.
3. The multilayer push-pull rod driven electromagnetic braille display device according to claim 1 or 2, characterized in that: the push-pull rod mounting holes in each layer of flat plate of the main body module are arranged in a line, and the push-pull rod mounting holes in two adjacent layers of flat plates are arranged in a staggered mode.
4. The multilayer push-pull rod driven electromagnetic braille display device according to claim 1 or 2, characterized in that: the push-pull rod is a rotating body on the whole, the push-pull rods are arranged on the front side and the rear side of each layer of flat plate, each push-pull rod can be independently pushed and pulled back and forth in the corresponding push-pull rod mounting hole, each push-pull rod comprises two structures, the first push-pull rod comprises a trapezoidal circular table, a cylindrical rod body, a circular flange and a tail part with a circular hole at one end, the second push-pull rod comprises a trapezoidal circular table, a cylindrical rod body and a circular flange, and the central hole of the circular flange of each structure is a circular hole for mounting the permanent magnet;
when the push-pull rod is pushed along the push-pull rod mounting hole, the side face of the trapezoidal circular truncated cone is in contact with the bottom of the ejector pin and gradually pushes the ejector pin to ascend until the circular flange of the push-pull rod is in contact with the side face of the flat plate, the bottom of the ejector pin is completely positioned on the cylindrical rod body of the push-pull rod, the ejector pin is positioned at the top dead center and presents a Braille 'convex point' on the cover plate, when the push-pull rod is pulled out along the push-pull rod mounting hole, the bottom of the ejector pin descends along the side face of the trapezoidal circular truncated cone until the ejector pin is separated from the trapezoidal circular truncated cone, the ejector pin is positioned on the main body module by the circular flange of the ejector pin, the ejector.
5. The multilayer push-pull rod driven electromagnetic braille display device according to claim 1 or 2, characterized in that: the flat plate and the cover plate are respectively provided with a positioning pin hole, the positioning pin holes of the flat plate and the cover plate vertically correspond to each other, and the cover plate and the main body module are fixedly connected together through interference fit of the positioning pins and the positioning pin holes.
6. The multilayer push-pull rod driven electromagnetic braille display device according to claim 4, characterized in that: the actuator comprises a permanent magnet, a solenoid and a cylindrical mandrel, wherein the solenoid is sleeved on the cylindrical mandrel and fixed with the cylindrical mandrel by heat-resistant glue; for the first type of push-pull rod, the permanent magnet is arranged in a circular hole at the tail part of the push-pull rod and is inserted into the solenoid along with the tail part of the push-pull rod, when the push-pull rod is pulled out, the push-pull rod is limited by a circular flange of the push-pull rod, the cylindrical mandrel is arranged on the bracket, a small gap is reserved between the end part of the cylindrical mandrel and the end surface of the permanent magnet, and the cylindrical mandrel is ensured to be magnetized by the internal magnetic field of the solenoid and not magnetized by; for the second type of push-pull rod, the permanent magnet is mounted in a circular hole of an annular flange, the annular flange is located outside the solenoid and corresponds to a cylindrical spindle inside the solenoid, and the cylindrical spindle and the permanent magnet are kept at least a non-magnetized distance.
7. The multilayer push-pull rod driven electromagnetic braille display device according to claim 6, characterized in that: a magnetizer is arranged in a gap between the solenoids, the magnetizer and the cylindrical core shaft are mounted on the bracket together, and the cylindrical core shaft, the bracket and the magnetizer form a magnetic circuit, so that the magnetic field intensity inside the solenoids is increased.
8. The multilayer push-pull rod driven electromagnetic braille display device according to claim 6 or 7, characterized in that: the upper side and the lower side of each bracket are respectively provided with a wiring board, the upper part and the lower part of each bracket are also provided with threaded holes, the wiring boards are fixed by screws, and the wire heads of the solenoids are welded on the wiring boards.
9. The multilayer push-pull rod driven electromagnetic braille display device according to claim 6 or 7, characterized in that: the solenoid adopts a skeleton form, the skeleton is hollow, flanges are arranged at two ends of the skeleton, the solenoid body is wound on the skeleton, when the push-pull rod is pulled out, the circular flange of the push-pull rod is contacted with the flange at the end part of the skeleton, and the flange at the end part of the skeleton plays a role in limiting the push-pull rod;
the cylindrical mandrel is made of semi-hard magnetic materials or rectangular magnetic materials, and after the cylindrical mandrel is inserted into the solenoid, the end part of the mandrel is lower than the end face of the solenoid framework flange, so that the mandrel is ensured not to be magnetized by the permanent magnet.
10. The multilayer push-pull rod driven electromagnetic braille display device according to claim 8, characterized in that: all extend to the support around the apron to set up the screw hole on the apron, link together support and apron through the screw.
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| CN201910983011.9A CN110689782A (en) | 2019-10-16 | 2019-10-16 | Multilayer push-and-pull rod drive type electromagnetic braille point display device |
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| CN201910983011.9A CN110689782A (en) | 2019-10-16 | 2019-10-16 | Multilayer push-and-pull rod drive type electromagnetic braille point display device |
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