CN107066101A - Tactile display device with self-locking stylus - Google Patents

Abstract

The invention discloses a touch display device with a self-locking contact pin. The upper part of the touch needle body is sleeved in a top sleeve, the top sleeve is provided with a guide rail groove along the vertical axial direction, the upper part of the touch needle body is fixedly connected with a horizontal pin, and the horizontal pin is embedded in the guide rail groove; the lower part of the touch needle body is sleeved on the upper part of the rotary sleeve through self-locking threads to form a screw rod rotating pair, the rotary sleeve is provided with a horizontal through hole, and the permanent magnet rod is horizontally arranged in the horizontal through hole in a penetrating manner; the rotary sleeve is connected with a short shaft, the center of the upper end of the bearing base plate is provided with a central hole, and the short shaft is inserted into the central hole to enable the rotary sleeve and the bearing base plate to form a revolute pair connection; the U-shaped electromagnet mainly comprises a left electromagnetic pole wall, a right electromagnetic pole wall and a middle magnetic block, and a bearing base plate is arranged between the left electromagnetic pole wall and the right electromagnetic pole wall of the U-shaped electromagnet and is positioned on the middle magnetic block. The device has compact structure, can realize the bulge and self-locking of the touch needle body, and can be used for the touch display of braille or figures.

Description

Tactile display device with self-locking stylus

technical field

The invention relates to a linear motion electromagnetic drive device, in particular to a tactile display device with self-locking stylus.

technical background

At present, the number of blind people in the world has reached 285 million, and China is the country with the largest number of blind people in the world. Due to impaired vision, blind people can only obtain external information through touch and hearing, while traditional methods use paper to make tactile images or Braille characters for blind people to touch and recognize images or words.

Compared with traditional paper materials, what the blind need more is a tactile display device that can refresh in real time and replace visual pixels with contacts, so as to quickly obtain image information. Through the real-time refreshing tactile display device, the blind can use the image or text in the tactile recognition device to understand the tactile image or text in a very natural interactive way.

Although many tactile assistive devices with similar functions have appeared on the market, the cost and price are too high, and the power consumption is also very large. Although the cost of other small-sized devices is controlled, they violate the common touch habits of blind people. and poor interactive experience.

Therefore, the prior art lacks a tactile recognition device for the blind that is low in cost, strong in experience, easy to carry, fast in response, capable of real-time reading, quick refresh, and replacement of visual pixels with touch points.

Contents of the invention

The purpose of the present invention is to provide a tactile display device with self-locking stylus, which can touch the up and down movement of the stylus and the automatic locking function. It can be freely combined into a braille tactile display device or a graphic tactile display device for blind people to recognize braille and graphics by tactile perception, which can realize real-time refresh of the touch needle body and reduce power consumption to a large extent.

The technical solution adopted by the present invention to solve its technical problems is:

The present invention is mainly composed of a plurality of touch single-needle components, which include a touch needle body, a rotating sleeve, a seat plate and a U-shaped electromagnet arranged and installed sequentially from top to bottom; the upper part of the touch needle body is covered with a top sleeve In the barrel, the symmetrical inner walls on both sides of the top sleeve are provided with guide rail grooves along the vertical axis, and horizontal pins are fixedly connected to the symmetrical outer walls on both sides of the upper part of the touch needle body, and the horizontal pins are embedded in the guide rail grooves, so that the touch needle body It is limited to move up and down along the vertical axis; the lower part of the touch needle body is provided with external threads, and the inner hole of the rotating sleeve is provided with internal threads, and the lower part of the touch needle body is set in the upper part of the rotating sleeve through self-locking threads to form a screw rotation , there is a horizontal through hole in the lower part of the rotating sleeve, and the permanent magnet rod is installed in the horizontal through hole horizontally; the center of the lower end of the rotating sleeve is connected with a short shaft, and the center of the upper part of the bearing plate is opened with a central hole, and the short shaft is inserted into the center The hole makes the rotating sleeve and the seat backing plate form a rotating pair connection; the U-shaped electromagnet is mainly composed of the left electromagnetic pole wall and the right electromagnetic pole wall and the middle magnetic block connected between the bottom of the left electromagnetic pole wall and the right electromagnetic pole wall Composition, the seat backing plate is placed between the left electromagnetic pole wall and the right electromagnetic pole wall of the U-shaped electromagnet and is located on the middle magnetic block.

The permanent magnet bar is located between the left electromagnetic pole wall and the right electromagnetic pole wall, and the magnetic poles at the horizontal ends of the permanent magnet bar are opposite in polarity, and the magnetic poles of the left electromagnetic pole wall and the right electromagnetic pole wall are opposite in polarity.

After the U-shaped electromagnet is energized, the magnetic attraction of the left and right electromagnetic pole walls to the two ends of the permanent magnet rod drives the rotating sleeve to rotate, and then drives the touch needle body to move up and down along the vertical axis through the screw rotation pair.

By reversing the current direction of the U-shaped electromagnet to reverse the magnetic pole polarity of the left electromagnetic pole wall and the right electromagnetic pole wall, and then reverse the direction of the magnetic attraction force at both ends of the permanent magnet rod, and then reverse the rotation direction of the rotating sleeve, and finally The direction in which the touch needle body moves up and down along the vertical axis is reversed by the screw rotation pair.

The lengths of the permanent magnet rods protruding from both ends of the horizontal through hole are the same.

The permanent magnetic bar and the horizontal through hole are transitionally fitted.

The short shaft and the central hole are clearance fit.

There is a space for winding an electromagnetic coil between the bottom of the base plate and the middle magnetic block of the U-shaped electromagnet, and the electromagnetic coil is wound on the middle magnetic block at the bottom of the U-shaped electromagnet.

The beneficial effects that the present invention has are:

1. The present invention adopts a threaded automatic locking structure, which has good stability and high reliability, can greatly reduce power consumption, and reduce electromagnetic heating;

2. The present invention can be freely combined and arranged to form a Braille tactile display device or a graphic tactile display device for blind people to recognize Braille and graphics by tactile sense, and has the feature of fast refreshing.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

Figure 2 is a front view of the working and non-working positions of the present invention.

Fig. 3 is a top view of the working position and the non-working position of the present invention.

Fig. 4 is a principle diagram of the thread self-locking of the touch needle body head of the present invention.

In the figure: 1. Touch needle body, 2. Rotating sleeve, 3. Permanent magnet rod, 4. Seat backing plate, 5. Electromagnet, 6. Horizontal pin, 7. Self-locking thread, 8. Short shaft, 9 , central hole, 10, left electromagnetic pole wall, 11, right electromagnetic pole wall, 12, electromagnetic coil, 13, horizontal through hole, 14, top sleeve, 15, guide rail groove.

detailed description

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Figure 1, the specific implementation of the present invention includes a plurality of single-touch needle components, and each single-touch needle component is sequentially provided with a touch needle body 1, a rotating sleeve 2, a seat backing plate 4, and a U-shaped needle body from top to bottom. Electromagnet 5.

As shown in Figure 1, the upper part of the touch needle body 1 is set in the top sleeve 14, the symmetrical inner walls on both sides of the top sleeve 14 are provided with guide rail grooves 15 along the vertical axis, and the symmetrical two outer walls on the upper part of the touch needle body 1 The upper part is fixedly connected with a horizontal pin 6, and the horizontal pin 6 is embedded in the guide rail groove 15, so that the touch needle body 1 is limited to move up and down along the vertical axis; the lower part of the touch needle body 1 is provided with external threads, and the inner hole of the rotating sleeve 2 is provided There are internal threads, the lower part of the touch needle body 1 is set in the upper part of the rotating sleeve 2 through the self-locking thread 7 to form a screw rotation pair, the lower part of the rotating sleeve 2 is provided with a horizontal through hole 13, and the permanent magnet rod 3 is horizontally installed in the Horizontal through hole 13; the center of the lower end of the rotating sleeve 2 is connected with a short shaft 8, and the center of the upper end of the seat backing plate 4 is opened with a central hole 9, and the short shaft 8 is inserted into the center hole 9 so that the rotating sleeve 2 and the seat backing plate 4 It constitutes a rotating pair connection; the U-shaped electromagnet 5 is mainly composed of the left electromagnetic pole wall 10 and the right electromagnetic pole wall 11 and the middle magnetic block connected between the bottom of the left electromagnetic pole wall 10 and the right electromagnetic pole wall 11, and the seat backing plate 4 is placed between the left electromagnetic pole wall 10 and the right electromagnetic pole wall 11 of the U-shaped electromagnet 5 and is located on the middle magnetic block.

The permanent magnet bar 3 is located between the left electromagnetic pole wall 10 and the right electromagnetic pole wall 11, and the magnetic poles at the horizontal ends of the permanent magnet bar 3 are opposite in polarity, and the magnetic poles of the left electromagnetic pole wall 10 and the right electromagnetic pole wall 11 are opposite in polarity.

The permanent magnet bar 3 and the horizontal through hole 13 are transitionally fitted, that is, the diameter of the permanent magnet bar 3 is slightly larger than the diameter of the horizontal through hole 13, so as to ensure that the permanent magnet bar 3 will not be deflected in the horizontal through hole 13 below the rotating sleeve 2. Move to move.

The short shaft 8 and the center hole 9 are clearance fit, that is, the inner diameter of the center hole 9 of the seat backing plate 4 is slightly larger than the diameter of the short shaft 8 of the rotating sleeve 2, so as to ensure that the rotating sleeve 2 can rotate freely on the seat backing plate 4 .

There is a space for winding the electromagnetic coil 12 between the bottom of the base plate 4 and the middle magnetic block of the U-shaped electromagnet 5 , and the electromagnetic coil 12 is wound on the middle magnetic block at the bottom of the U-shaped electromagnet 5 .

As shown in Figure 4, the thread self-locking principle of the touch single needle member of the present invention is:

When the touch needle body slides along the thread surface, the axial load F _Q is the force driving the touch needle body to slide down, F is the force hindering the touch needle body from sliding down, and the direction of the friction force F _f is opposite to the movement direction of the touch needle body . The force polygon closed graph composed of F _R , F and F _Q can be obtained:

F＝F _Q tan(λ-ρ)

Among them, λ represents the thread lead angle, and ρ represents the friction angle;

At this time, when the internal thread of the rotating sleeve rotates once, the input work is W ₁ =F _Q S, S represents the thread lead, and the output work is W ₂ =Fπd ₂ , then the efficiency of the screw pair is:

In the formula, _d2 represents the pitch diameter of the thread, η is the efficiency of the screw pair, λ is the slope of the screw pair, and ρ is the friction coefficient of the screw pair. When λ≤ρ, that is, η≤0, it means that no matter how much the F _Q force is, the touch pin cannot move, and the touch pin can be self-locked.

The working principle of the present invention is as follows:

As shown in Fig. 2 and Fig. 3, the one on the left represents the non-working position, and the one on the right represents the working position. When the electromagnet 5 is supplied with forward current, the touch needle body 1 is in the non-working position at this moment. When a reverse current is applied to the electromagnet 5, the rotating sleeve 2 rotates under the action of electromagnetic force, so that the touch needle body 1 moves upwards and is in the working position.

The process of touching the needle body to the working position (the right side of Fig. 2 and Fig. 3): by passing forward current to the electromagnetic coil 12, the left electromagnetic pole wall 11 of the U-shaped electromagnet 5 forms an S pole, and the right electromagnetic pole wall 10 forms an N pole, which attracts the S pole and N pole of the permanent magnet rod 3 respectively, pushes the rotating sleeve 2 to rotate forward, and pushes the touch needle body 1 to move upward through the self-locking thread 7 . After the power is cut off, the touch needle body 1 cannot freely move downward due to the self-locking of the self-locking thread 7 and remains in the working position.

The process of touching the needle body down to the non-working position (the left side of Fig. 2 and Fig. 3): by passing reverse current to the electromagnetic coil 12, the left electromagnetic pole wall 11 of the U-shaped electromagnet 5 forms an N pole, and the right electromagnetic pole The wall 10 forms an S pole, which repels the S pole and the N pole of the permanent magnet bar 3 respectively, and pushes the rotating sleeve 2 to rotate in reverse, and pushes the touch needle body 1 to move downward through the self-locking thread 7 .

It can be seen that the present invention can realize the protrusion and self-locking of the touch needle body, can be used for tactile display of Braille or graphics, and has outstanding technical effects.

Claims (8)

1. A tactile display device with self-locking stylus, characterized in that: it includes a plurality of touch single needle components, and the touch single needle components include a touch needle body (1), a rotating sleeve (2) arranged and installed sequentially from top to bottom ), the seat backing plate (4) and the U-shaped electromagnet (5); in the top sleeve (14) of the upper part of the touch needle body (1), the top sleeve (14) has symmetrical inner walls on both sides along the vertical The guide rail groove (15) of the straight axis is fixedly connected with the horizontal pin (6) on the symmetrical both sides outer wall of the touch needle body (1), and the horizontal pin (6) is embedded in the guide rail groove (15), so that the touch needle body ( 1) It is limited to move up and down along the vertical axis; the lower part of the touch needle body (1) is provided with external threads, the inner hole of the rotating sleeve (2) is provided with internal threads, and the lower part of the touch needle body (1) passes through the self-locking thread ( 7) Set in the upper part of the rotating sleeve (2) to form a screw rotation pair, the lower part of the rotating sleeve (2) is provided with a horizontal through hole (13), and the permanent magnet rod (3) is horizontally installed in the horizontal through hole ( 13); the center of the lower end of the rotating sleeve (2) is connected with a short shaft (8), and the center of the upper end of the seat backing plate (4) has a central hole (9), and the short shaft (8) is inserted into the central hole (9) so that The rotating sleeve (2) and the seat backing plate (4) form a rotating pair connection; the U-shaped electromagnet (5) is mainly composed of the left electromagnetic pole wall (10) and the right electromagnetic pole wall (11) and connected to the left electromagnetic pole wall (10) and the middle magnetic block between the bottom of the right electromagnetic pole wall (11) constitutes, and the seat backing plate (4) is placed on the left electromagnetic pole wall (10) and the right electromagnetic pole wall ( 11) between and on the middle magnetic block. 2. A tactile display device with self-locking stylus according to claim 1, characterized in that: the permanent magnet rod (3) is located between the left electromagnetic pole wall (10) and the right electromagnetic pole wall (11) , and the polarity of the magnetic poles at the horizontal ends of the permanent magnet rod (3) is opposite, and the magnetic poles of the left electromagnetic pole wall (10) and the right electromagnetic pole wall (11) are opposite in polarity. 3. A tactile display device with self-locking stylus according to claim 2, characterized in that: the U-shaped electromagnet (5) passes through the left electromagnetic pole wall (10) and the right electromagnetic pole wall (11) after being powered on. The magnetic attraction to the two ends of the permanent magnet rod (3) drives the rotating sleeve (2) to rotate, and then drives the touch needle body (1) to move up and down along the vertical axis through the rotating pair of the lead screw. 4. A tactile display device with self-locking stylus according to claim 2, characterized in that: the left electromagnetic pole wall (10) and the right electromagnetic pole wall (10) are reversed by reversing the U-shaped electromagnet (5) energized current direction. The polarity of the pole wall (11), and then reverse the direction of the magnetic attraction force at both ends of the permanent magnet rod (3), and then reverse the rotation direction of the rotating sleeve (2), and finally make the touch needle body (1 ) is reversed in the direction of moving up and down along the vertical axis. 5 . The tactile display device with self-locking stylus according to claim 1 , characterized in that: the lengths of the permanent magnet rods ( 3 ) protruding from both ends of the horizontal through hole ( 13 ) are the same. 6 . 6 . The tactile display device with self-locking stylus according to claim 1 , characterized in that: the permanent magnet bar ( 3 ) is in transition fit with the horizontal through hole ( 13 ). 7 . The tactile display device with self-locking stylus according to claim 1 , characterized in that: the short axis ( 8 ) is in clearance fit with the central hole ( 9 ). 8. A tactile display device with self-locking stylus according to claim 1, characterized in that: there is a gap between the bottom of the base plate (4) and the middle magnetic block of the U-shaped electromagnet (5). There is space for winding the electromagnetic coil (12), and the electromagnetic coil (12) is wound on the middle magnetic block at the bottom of the U-shaped electromagnet (5).