CN106626902B - A kind of Rear projection teaching integrated device - Google Patents

Abstract

The invention discloses a rear projection projection teaching integrated device, which mainly relates to the field of audio-visual education equipment. Including frame body, projector, teaching board, the lower part of the frame body is provided with a seat slot, the projector is set in the seat slot, the projector projects upwards and backwards, and the back side of the frame body is provided with a retractable reflector , the teaching board is installed in the middle and upper part of the frame body, the front of the teaching board is provided with a transparent acrylic writing board, the inner side of the writing board is provided with a rear projection screen, the writing board is provided with an optical fiber wire that can be lifted, and the two ends of the optical fiber wire are set There is a light source that can make the fiber optic filament shine, and the front side of the teaching board is provided with an automatic cleaning device that is slidingly connected with it horizontally. The beneficial effect of the present invention is that it has the functions of writing on the blackboard and prompting marks at the same time, can meet the requirements of small-scale high-level teaching, and also has the advantages of folding storage, easy cleaning, and long service life, reduces maintenance costs, and is conducive to the realization of general promotion .

Description

A rear-projection projection teaching integrated device

technical field

The invention relates to the field of audio-visual education equipment, in particular to a rear-projection projection teaching integrated device.

Background technique

With the continuous improvement of the level of science and technology, the diversification of teaching content and the increasing amount of information in colleges and universities, the use of multimedia technology to assist teaching has become one of the main teaching methods in colleges and universities. In a sense, the rationality of the equipped audio-visual equipment has a great influence on the teaching quality and teaching level.

Most of the electronic classrooms in colleges and universities use soft curtains that can be rolled up, and a projector is hoisted for front-projection projection of teaching content. This fixed installation method and front-projection projection structure have many limitations in flexibility, convenience, and functionality. When encountering situations such as the in-depth explanation of direction professional courses, the introduction of high-quality public courses, and the local discussion in the laboratory, etc., when a small-scale high-level teaching environment is required, the existing audio-visual teaching devices show many deficiencies, which are mainly reflected in :

First of all, the projection method of front projection not only has higher requirements on indoor light, but also requires a relatively dark environment to obtain a clear image. Significantly weakened. On the one hand, the effect of courseware display is not good, which seriously affects the effective transmission of course information, poor sense of substitution, and lower teaching level. On the other hand, the dark environment is not conducive to students taking notes, flipping through materials, reading blackboard writing, etc., which makes teaching and learning inconvenient. Although the existing technology has rear projection equipment, it takes up more space than the front projection. Although in the class environment, the space of the podium is not tight for the rear projection projection, but in the storage environment, the distance between the reflection mechanism and the projection mechanism The distance takes up more space, so that the rear projection equipment that can be stored and managed in the unit's indoor space is limited. However, the reflection mechanism and the projection mechanism of the split structure need to adjust the angle repeatedly during use, and the installation is relatively difficult, which is difficult for ordinary teachers to complete independently, which affects the use and promotion of rear projection equipment in educational technology.

Secondly, the existing screens have very single functions, that is, they can only be used as projection cloths. As a result, teachers can only write explanations and blackboard writing on blackboards or whiteboards when teaching, which cannot be combined with projection content, and key knowledge points cannot be annotated, calculated, reasoned, etc., which is not conducive to the continuity of teaching content And continuity, not only makes it difficult to improve the teaching level, but also affects students' understanding and mastery.

Furthermore, in many cases, the teacher's explanation is often out of the classroom environment, and needs to conduct on-the-spot discussions, explanations, or data discussion and analysis in teaching areas such as laboratories and simulation rooms, which are highly interactive, which requires a This kind of audio-visual projection equipment can not only be flexibly set according to the teaching environment, but also not limited to the podium, it is easy to move and adjust the position, and it is convenient for teachers and students to discuss and analyze. Obviously, the existing audio-visual projection equipment is neither convenient to move, nor has a single function, which cannot satisfy the dual functions of playing and discussing calculations.

Also, during the lecture process, due to the rich and intensive playback content, there is often a problem that the current text cannot be found. The incoherent teaching will not only affect the teaching efficiency and quality of teachers, but also affect learning once students cannot find the current content. In order to solve the above problems, many teachers use a laser pointer to point out the current content, but on the one hand, this prompt method is intermittent and cannot be continuously tracked, and the teacher still needs to find the content location first, so it cannot solve the problem of the teacher repeatedly looking for the current content The problem is, in addition, the shaking of the light spot is not easy for students to catch, and it will cause discomfort when watching the teaching materials. The prior art has also released some curtain mechanisms with marking devices, which keep prompting the current content through the marking devices set on the activities. However, the marking devices in the prior art all block the curtain to a certain extent, and cannot provide prompts without affecting the effect of courseware display at all, so the practicability is not strong. And it generally requires manual adjustment by the teacher, which is very inconvenient to use.

Finally, due to the existing audio-visual equipment, the curtain generally adopts soft curtain, which is easily damaged by external force and difficult to maintain. At the same time, the blackboard part and the screen part are set independently, which requires cleaning and maintenance of the blackboard and the screen separately. Adverse effects on the indoor environment.

Contents of the invention

The purpose of the present invention is to provide a rear-projection projection teaching integrated device, which is not limited to the classroom environment, but can realize high-quality projection display functions in any local environment, and at the same time has functions such as writing on the blackboard, prompting marks, etc. It is convenient for teaching, interaction, discussion and other classroom links, significantly improves the teaching quality, can meet the requirements of small-scale high-level teaching, and also has the advantages of folding storage, easy cleaning, and long life, reducing maintenance costs, and is conducive to the realization of general promotion .

In order to achieve the above object, the present invention is achieved through the following technical solutions:

A rear-projection projection teaching integrated device, including a frame body, a projector, and a teaching board. The lower part of the frame body is provided with a seat slot, and the projector is arranged in the seat slot. For projection, the back side of the frame is provided with a retractable reflector, the teaching board is installed on the middle and upper part of the frame, the front of the teaching board is provided with a transparent acrylic writing board, and the inside of the writing board is The side is provided with a rear projection screen, the writing board is provided with an optical fiber that can be lifted up and down, the two ends of the optical fiber are provided with a light source that can make the optical fiber shine, and the front side of the teaching board is provided with a horizontal slide Connected automatic cleaning device.

The top side of the teaching board is provided with a mounting plate fixedly connected to the frame body, the bottom side of the teaching board is provided with a device box along the length direction, and both sides of the teaching board are equipped with lifting guide rails and leading screws. The top of the lifting guide rail is fixedly connected with the mounting plate, the bottom end of the lifting guide rail is fixedly connected with the device box, the lifting guide rail is provided with a lifting slider matched with it, and the lead screw is provided with a matching lifting slider screw nut, the top of the lead screw is rotatably connected with the mounting plate, the bottom end of the lead screw penetrates into the device box and is rotatably connected with the device box, the bottom end of the lead screw is provided with a synchronous wheel, and the lead screws on both sides A synchronous belt is wound between the synchronous wheels at the bottom, a lifting motor is installed in the device box, and the lifting motor is connected with the screw on one side, and a lifting box is arranged on both sides of the teaching board. The wire nut and the lifting slider are fixedly connected on the lifting box, and the inside of the lifting box is provided with an LED light, and the two ends of the optical fiber wire are respectively inserted into the lifting box on the same side and fixed in the lifting box.

The top side of the teaching board is provided with a mounting plate fixedly connected with the frame body, the mounting plate is provided with a rack and an upper slide rail along the length direction, the upper slide rail is provided with an upper slider, and the teaching The lower side of the plate is provided with a sliding rail along the length direction, and the sliding slider is provided on the sliding rail. The automatic cleaning device includes a vertical cleaning box, a power box and a dirt collection box. The cleaning box The body is vertically provided with a rolling brush for cleaning the writing board. The cleaning box is a box with an opening on the inside. One end of the opening of the cleaning box is provided with a rubber scraper. The section of the rubber scraper is It is arc-shaped, and its inner end is in contact with the writing board. The other end of the opening of the cleaning box is provided with a baffle, and the baffle is inserted into the roller brush and a comb for combing the roller brush is provided on the baffle. Teeth, the top of the cleaning box communicates with the power box, the top of the rolling brush extends into the power box and is provided with a rotating gear, the rolling brush is rotatably connected with the power box, and the power box is installed There is a cleaning motor, the output end of the cleaning motor is connected with a power gear, and the power gear is meshed with the rotating gear, and the walking gear is connected with the rotating gear in the power box, and the walking gear is meshed with the power gear, and the walking gear is meshed with the power gear. The peripheral side of the gear protrudes from the power box and meshes with the rack, the power box is fixedly connected with the upper slider, the top of the dirt collection box communicates with the bottom of the cleaning box, and the collection The dirty box body is fixedly connected with the sliding fast.

The cleaning box body includes a dirt collecting bucket whose top is connected with the cleaning box body. The bottom end of the dirt collecting bucket is provided with an internal thread, and the dirt collecting bucket is provided with an inner box corresponding to it. The inner box The bottom end of the box is provided with an external thread threaded with the internal thread, the top of the inner box is provided with an elastic bell mouth, and the bottom end of the inner box is provided with a twist handle.

The rolling brush includes a brush shaft, on which bristles are arranged, the bristles are in contact with the writing board, the comb teeth match with the bristles, and the top end of the brush shaft is rotatably connected with the power box.

Both sides of the reflector are provided with frame plates, and the two sides of the back of the frame body are symmetrically provided with an upper hinged seat and a lower hinged seat, and an upper hinged arm is hinged on the upper hinged seat. The end is hinged with the top of the shelf plate, and the lower pivoting arm is hinged on the lower hinge seat. The end of the lower pivoting arm is provided with a connecting shaft, and the end of the connecting shaft is provided with a bull’s-eye ball. The lower part is provided with a chute, and the bull’s-eye ball is arranged in the chute and is slidably connected with the chute. Both sides of the frame body are provided with an upper bracket and a lower bracket, and the upper bracket is provided with a The upper card slot corresponding to the upper arm, the lower bracket is provided with the lower card slot corresponding to the lower arm, the outer side of the lower arm is provided with a hook, and the two sides of the frame are provided with Buckle that fits with hooks.

The device box is provided with a plurality of pulleys matched with the synchronous belt.

The bottom of the frame body is provided with a base, and casters are installed on the bottom surface of the base.

The back side of the frame body is provided with a light shield, the light shield is an inverted U-shaped cover with an opening downward, the inner side of the light shield is connected with both sides of the frame body, and the top of the light shield Creases are provided on the face, and an opening with a zipper is provided on the side of the light shield.

Compared with the prior art, the beneficial effects of the present invention are:

1. This device uses a rear-projection projection method, which significantly reduces the projection distance through refraction, so that the teaching space of ordinary small classrooms can meet its projection space requirements. As we all know, the image definition of the rear projection type is significantly superior to that of the front projection equipment, and there is no requirement for the light in front of the screen. It can teach in a well-lit environment and significantly improve the integrity and high-quality presentation and transmission of course information. To ensure the level of teaching. On this basis, the device adopts a retractable reflector structure, which can be used when it is unfolded, which is convenient and quick. After use, it can be retracted and attached to the back of the teaching board, which greatly reduces the occupied space and solves the problem of existing back problems. The storage of throwing devices takes up a lot of space.

In addition, the unique optical fiber prompting device of this device uses transparent, ultra-fine optical fiber with a certain brightness as the prompt line, which can not only continuously and clearly track the teaching progress, prompt the current text position, but also have no effect on the projected content. Occlusion does not affect the display of other projected content, and has significant advantages over existing prompting mechanisms.

In addition, this device adopts the integrated structure of curtain and writing, and a rear projection screen interlayer is set in the transparent writing board, which can not only perform projection, but also write on the writing board, so that the teaching board has dual functions of projection and writing at the same time , it is convenient for teachers to directly mark the required annotation and analysis content on the projection image, so that the teaching of knowledge points is coherent and clear, and the teaching quality is greatly improved.

At the same time, this device adopts the integrated structure of curtain and writing, which directly simplifies the maintenance work, integrates the separate cleaning and maintenance of the blackboard and curtain, and combines the automatic cleaning device to replace the cleaning operation of manually wiping the blackboard and wiping the curtain , greatly saving the workload. Moreover, the structure of the rear projection screen on the inner layer of the outer writing board has a better protection effect on the rear projection screen, avoiding problems such as external force damage and dust adsorption of the screen, reducing maintenance costs and prolonging the service life.

In summary, combined with the various structures of the device, the device is not limited to the classroom environment, but can realize high-quality projection display functions in any local environment, and at the same time have functions such as writing on the blackboard, prompting marks, etc. It facilitates the teaching, interaction, discussion and other classroom links, significantly improves the teaching quality, and can meet the requirements of small-scale high-level teaching.

2. The fiber optic wire can be controlled electrically through the lifting guide rail and the lead screw, which greatly facilitates the use of the teacher. It does not need manual adjustment by the teacher, does not interrupt the teacher's teaching process, and improves the continuity of the course.

3. The automatic cleaning device can walk left and right on the teaching board, and drive the rotation of the roller brush and the walking gear through the power gear, so that the automatic cleaning device can clean the writing marks through the rotation of the roller brush during walking, replacing manual labor, significantly reducing the labor force.

Simultaneously, after using marker pen to write, also can produce more black foam dust when wiping, pollute indoor environment. This device uses the roller brush to rotate towards the cleaning box, collects the wiped dust into the cleaning box, and scrapes it off through the rubber scraper, and the collected dust falls into the dirt collecting box below to ensure the cleanness of the indoor environment. clean. And the comb teeth can scrape the lint, dust and mud adhered on the roller brush into the cleaning box body, so that the roller brush can realize self-cleaning and maintain better and lasting cleaning power.

4. The inner box is threadedly connected with the dirt collecting barrel, which is convenient for dumping garbage. And the bell mouth is opened outwards, can choose to use rubber or silicon rubber material, has high elasticity, can be bent when entering, and after being inserted into the dirt collection bucket, it is tightly attached to the bucket wall, which is convenient for collecting dust.

5. The reflector is connected to the frame body through the upper and lower rotating arms to realize the function of unfolding and retracting. The upper bracket and the lower bracket can support the upper rotating arm and the lower rotating arm respectively, so that the unfolded reflector can be kept at a reasonable position. The arrangement of the bull's-eye ball can significantly improve the lubricity of the end of the lower arm sliding along the chute, and can adjust the angle while sliding to realize the smooth storage of the reflector. The hasp can cooperate with the hook to fix the lower swing arm, and then fix the reflector in a retracted state.

6. The pulley can support and correct the route of the synchronous belt in long-distance transmission, so as to ensure the synchronous rotation of the synchronous wheels on both sides.

7. The base is conducive to improving the stability of the overall device, and the casters are easy to move, so that it is conveniently applicable to various teaching environments.

8. The light shield can provide a dark room environment for the reflective environment of the projector, and improve projection clarity. The setting of the creases is similar to the crease structure on the bottom surface of a common handbag, which is convenient for folding more neatly when stowed. The setting of the zipper opening facilitates the operation of the internal components. At the same time, the light shield can also effectively protect the entire device, so that it can avoid contamination during storage.

Description of drawings

Accompanying drawing 1 is the schematic diagram of side structure of the present invention.

Accompanying drawing 2 is the schematic diagram of the front of the present invention.

Accompanying drawing 3 is the partial structure schematic diagram of the shelf part under the retracted state of the reflector according to the present invention.

Accompanying drawing 4 is the longitudinal structure diagram of the power box body part of the present invention.

Accompanying drawing 5 is the structure diagram of upper bracket of the present invention.

Accompanying drawing 6 is the schematic diagram of the transverse structure of the power box part of the present invention.

Accompanying drawing 7 is the schematic cross-sectional view of the cleaning box of the present invention.

Accompanying drawing 8 is the enlarged view of A part of accompanying drawing 1 of the present invention.

Accompanying drawing 9 is the enlarged view of B part of accompanying drawing 1 of the present invention.

Accompanying drawing 10 is the enlarged view of part C of accompanying drawing 3 of the present invention.

Labels shown in the accompanying drawings:

1. Frame; 2. Projector; 3. Teaching board; 4. Machine slot; 5. Reflector; 6. Writing board; 7. Rear projection screen; 8. Optical fiber; 9. Automatic cleaning device; 10. Mounting plate; 11, device box; 12, lifting guide rail; 13, lead screw; 14, synchronous wheel; 15, synchronous belt; 16, lifting box; 17, rack; 18, upper slide rail; 19, lower slide rail; 20 , cleaning box; 21, power box; 22, dirt collection box; 23, roller brush; 24, rubber scraper; 25, baffle; 26, rotating gear; 27, power gear; 28, travel gear; 29 , sewage bucket; 30, inner box; 31, bell mouth; 32, shelf plate; 33, upper hinged seat; 34, lower hinged seat; 35, upper rotating arm; 36, lower rotating arm; 37, connecting shaft; 38 , bull's eye ball; 39, chute; 40, upper bracket; 41, lower bracket; 42, hook; 43, buckle; 44, pulley; 45, base; 46, casters; 47, light shield .

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined in the present application.

The present invention is a rear-projection projection teaching integrated device. The main structure includes a frame body 1, a projector 2, and a teaching board 3. The lower part of the frame body 1 is provided with a seat slot 4, and the projector 2 is arranged In the seat slot 4, the projector 2 projects upwards and backwards. The image definition of the rear projection type is significantly superior to that of the front projection equipment, and there is no requirement for the light in front of the screen, so it can be taught in an environment with sufficient light , and significantly improve the integrity and high quality of course information display and transmission, ensuring the teaching level. The back side of the frame body 1 is provided with a retractable reflector 5, which significantly reduces the projection distance through refraction, so that the teaching space of an ordinary small classroom can meet its projection space requirements. The reflector 5 structure that can be stowed is adopted, and it can be used when it is unfolded, which is convenient and fast. After use, it can be stowed and attached to the back side of the teaching board 3, which greatly reduces the occupied space and solves the problem of the storage space occupied by the existing rear projection device. more questions. The teaching board 3 is installed on the middle and upper part of the frame body 1, the front of the teaching board 3 is provided with a transparent acrylic writing board 6, and the inside of the writing board 6 is provided with a rear projection screen 7, which adopts a curtain-writing integrated structure, the rear projection screen 7 interlayer is set in the transparent writing board 6, which can not only project, but also write on the writing board 6, so that the teaching board 3 has the dual functions of projection and writing at the same time, which is convenient for teachers to write the required notes , The analyzed content is directly marked on the projected image, which makes the teaching of knowledge points coherent and clear, and greatly improves the quality of teaching. Simultaneously, have and this device has adopted the integrated structure of curtain-writing, has directly simplified maintenance work, makes now to blackboard, curtain separately clean, maintain and integrate into one, this outer layer writing board 6 inner layer rear projection screen 7 structure, which has a good protection effect on the rear projection screen 7, avoids problems such as external damage to the screen, dust adsorption, etc., reduces maintenance costs and prolongs the service life. The writing board 6 is provided with an optical fiber filament 8 that can be raised and lowered. The optical fiber filament 8 that is transparent, extremely thin, and has a certain brightness is used as a prompt line, which can not only continuously and obviously track the teaching progress, but also prompt the current text position. It does not block the projected content and does not affect the display of other projected content, which has significant advantages over the existing prompting mechanism. Both ends of the optical fiber 8 are provided with a light source capable of making the optical fiber 8 shine, and the front side of the teaching board 3 is provided with an automatic cleaning device 9 horizontally slidingly connected to it. It replaces the cleaning operation of manually wiping the blackboard and the curtain, which greatly saves the workload.

In summary, combined with the various structures of the device, the device is not limited to the classroom environment, but can realize high-quality projection display functions in any local environment, and at the same time have functions such as writing on the blackboard, prompting marks, etc. It facilitates the teaching, interaction, discussion and other classroom links, significantly improves the teaching quality, and can meet the requirements of small-scale high-level teaching.

The top side of the teaching board 3 is provided with a mounting plate 10 fixedly connected to the frame body 1, the bottom side of the teaching board 3 is provided with a device box 11 along the length direction, and both sides of the teaching board 3 are equipped with lifting Guide rail 12 and leading screw 13, the top of described lifting guide rail 12 is fixedly connected with mounting plate 10, and the bottom end of described lifting guide rail 12 is fixedly connected with device box 11, and described lifting guide rail 12 is provided with the lifting slide that cooperates with it block, the screw nut 13 is provided with a matching nut, the top of the screw 13 is rotatably connected to the mounting plate 10, the bottom of the screw 13 penetrates into the device box 11 and connects with the device box 11 Rotation connection, the bottom of the screw 13 is provided with a synchronous wheel 14, and a synchronous belt 15 is wound between the synchronous wheels 14 at the bottom of the screw 13 on both sides to ensure the synchronous lifting of both sides, so that the optical fiber wire 8 is horizontal, and the device A lifting motor is installed in the box 11, and the lifting motor is connected with the lead screw 13 on one side. The two sides of the teaching board 3 are provided with a lifting box 16, and the screw nut and the lifting slider are fixedly connected to the lifting frame. On the box 16, an LED light is arranged inside the lifting box 16, and the two ends of the optical fiber 8 are respectively inserted into the lifting box 16 on the same side and fixed in the lifting box 16. The optical fiber wire 8 can be electrically controlled through the lifting guide rail 12 and the lead screw 13, which greatly facilitates the use of the teacher, does not require manual adjustment by the teacher, does not interrupt the teacher's teaching process, and improves the continuity of the course.

The top side of the teaching board 3 is provided with a mounting plate 10 fixedly connected with the frame body 1, and the mounting plate 10 is provided with a rack 17 and an upper slide rail 18 along the length direction, and the upper slide rail 18 is provided with Upper slider, the lower side of the teaching board 3 is provided with a lower rail 19 along the length direction, the lower rail 19 is provided with a lower slider, and the automatic cleaning device 9 includes a vertical cleaning box body 20, a power Box body 21 and dirt collection box body 22, described cleaning box body 20 is vertically provided with the rolling brush 23 that is used for cleaning writing board 6, after using marker pen to write, also can produce more black foam when wiping Dust pollutes the indoor environment. The device utilizes the rolling brush 23 to rotate in the cleaning box body 20, and the dust wiped off is collected in the cleaning box body 20. The cleaning box body 20 is a box body with an opening on the inside, and the cleaning box body 20 One end of the opening is provided with a rubber scraper 24, which can scrape off the sticky impurities on the blackboard, and collect the dust and fall into the dirt collection box 22 below to ensure the cleanliness of the indoor environment. The cross-section of the rubber scraper 24 is arc-shaped, and its inner end is in contact with the writing board 6. The other end of the opening of the cleaning box body 20 is provided with a baffle plate 25, which closes the dust ring and prevents it from flying. The baffle plate 25 is inserted into the roller brush 23, and the baffle plate 25 is provided with comb teeth for combing the roller brush 23, which can scrape the fluff, dust and mud adhered on the roller brush 23 in the cleaning box body 20. , so that the roller brush 23 can realize self-cleaning and maintain better and lasting cleaning power. The top of the cleaning box body 20 communicates with the power box body 21, the top end of the rolling brush 23 extends into the power box body 21 and is provided with a rotating gear 26, the rolling brush 23 is rotationally connected with the power box body 21, A cleaning motor is installed in the power box body 21, and a power gear 27 is connected to the output end of the cleaning motor, and the power gear 27 is meshed with a rotating gear 26, and a traveling gear 28 is connected in rotation in the power box body 21. , the travel gear 28 meshes with the power gear 27, the peripheral side of the travel gear 28 protrudes from the power box body 21 and meshes with the rack 17, and the power box body 21 is fixedly connected with the upper slider, so The top of the dirt collection box body 22 communicates with the bottom end of the clean box body 20, and the dirt collection box body 22 is fixedly connected with the slide down. The automatic cleaning device 9 can walk left and right on the teaching board 3, and the rotation of the rolling brush 23 and the walking gear 28 are driven by the power gear 27, so that the automatic cleaning device 9 can wipe the writing traces by the rotation of the rolling brush 23 during walking. Brush clean, replace manual labor, significantly reduce labor.

The cleaning box body 20 includes a dirt collecting bucket 29 whose top is connected with the cleaning box body 20, and the bottom end of the dirt collecting bucket 29 is provided with an internal thread, and the dirt collecting bucket 29 is provided with an inner box adapted to it. 30, the bottom end of the inner box 30 is provided with an external thread threadedly connected with the internal thread, which is convenient for loading and unloading and dumping garbage. The top of the inner box 30 is provided with an elastic bell mouth 31, which can be made of rubber or silicon rubber, which is highly elastic and can be bent when entering. After being inserted into the dirt collection bucket 29, it is tightly attached to the bucket wall, so as to facilitate dust collection. mince. The bottom end of the inner box 30 is provided with a twist handle. Easy to operate.

The rolling brush 23 includes a brush shaft, on which bristles are arranged, the bristles are in contact with the writing board 6, the comb teeth are matched with the bristles, and the top of the brush shaft is rotatably connected with the power box body 21 .

Both sides of the reflector 5 are provided with frame plates 32, and both sides of the back of the frame body 1 are symmetrically provided with an upper hinged seat 33 and a lower hinged seat 34, and the upper hinged seat 33 is hinged with an upper rotating arm 35 , the end of the upper arm 35 is hinged with the top of the frame plate 32, the lower hinge seat 34 is hinged with the lower arm 36, the end of the lower arm 36 is provided with a connecting shaft 37, and the connecting shaft 37 The end of the end is provided with a bull's-eye ball 38, which can significantly improve the lubricity of the end of the lower arm 36 sliding along the chute 39, and can adjust the angle while sliding to realize the smooth folding of the reflector 5. The middle and lower part of the frame plate 32 is provided with a chute 39, the bull's-eye ball 38 is arranged in the chute 39 and is slidably connected with the chute 39, and both sides of the frame body 1 are provided with an upper bracket 40 and The lower bracket 41, the upper bracket 40 is provided with an upper slot corresponding to the upper arm 35, the lower bracket 41 is provided with a lower slot corresponding to the lower arm 36, the lower A hook 42 is provided on the outer side of the rotating arm 36 , and hasps 43 matching with the hook 42 are provided on both sides of the frame body 1 . The lower rotating arm 36 is fixed, and then the reflector 5 is fixed in the retracted state. The reflector 5 is connected to the frame body 1 through the upper rotating arm 35 and the lower rotating arm 36 to realize the functions of unfolding and retracting. The upper bracket 40 and the lower bracket 41 can hold the upper rotating arm 35 and the lower rotating arm 36 respectively, so as to keep the unfolded reflector 5 in a reasonable position.

The device box 11 is provided with a plurality of pulleys 44 matched with the timing belt 15 . It can play the role of holding up and correcting the route of the synchronous belt 15 in long-distance transmission, so as to ensure the synchronism of the rotation of the synchronous wheels 14 on both sides.

The bottom of the frame body 1 is provided with a base 45, which is beneficial to improve the stability of the whole device, and casters 46 are installed on the bottom surface of the base 45. It is easy to move, so it is convenient to apply to various teaching environments.

The back side of the frame body 1 is provided with a light shield 47, which is an inverted U-shaped cover with an opening downward, which can provide a dark room environment for the reflective environment of the projector 2 and improve projection clarity. It also effectively protects the entire device from contamination during storage. The inner side of the light shield 47 is connected to both sides of the frame body 1, and the top surface of the light shield 47 is provided with creases, which are similar to the crease structure on the bottom surface of a commonly used handbag, so that it can be folded when it is convenient to pack. more tidy. The side of the light blocking cover 47 is provided with an opening with a zipper. Easy access to internal components.

Embodiment: The present invention is a rear-projection projection teaching integrated device. The main structure includes a frame body 1, a projector 2, and a teaching board 3. The lower part of the frame body 1 is provided with a seat slot 4, and the projector 2 is set in the seat slot 4, the projector 2 projects in the upward and backward direction, the back side of the frame body 1 is provided with a reflector 5 that can be stowed, and the two sides of the reflector 5 are provided with a frame plate 32, the two sides of the back of the frame body 1 are symmetrically provided with an upper hinge seat 33 and a lower hinge seat 34, and the upper hinge seat 33 is hinged with an upper rotating arm 35, and the end of the upper rotating arm 35 is connected to the frame. The top of the plate 32 is hinged, the lower hinged seat 34 is hinged with a lower arm 36, the end of the lower arm 36 is provided with a connecting shaft 37, and the end of the connecting shaft 37 is provided with a bull's-eye ball 38. The middle and lower part of the frame plate 32 is provided with a chute 39, the bull's-eye ball 38 is arranged in the chute 39 and is slidably connected with the chute 39, and both sides of the frame body 1 are provided with an upper bracket 40 and a lower bracket. frame 41, the upper bracket 40 is provided with an upper slot corresponding to the upper arm 35, and the lower bracket 41 is provided with a lower slot corresponding to the lower arm 36, and the lower arm A hook 42 is provided on the outer side of 36 , and buckles 43 matching with the hook 42 are provided on both sides of the frame body 1 . Described teaching board 3 is installed on the middle upper part of frame body 1, and the front of described teaching board 3 is provided with transparent acrylic writing board 6, and the inner side of described writing board 6 is provided with rear projection screen 7, and on described writing board 6 An optical fiber filament 8 capable of lifting is provided, the top side of the teaching board 3 is provided with a mounting plate 10 fixedly connected to the frame body 1, and the bottom side of the teaching board 3 is provided with a device box 11 along the length direction, and the teaching board 3 is provided with a device box 11 along the length direction. Both sides of plate 3 are equipped with lifting guide rail 12 and leading screw 13, the top of described lifting guide rail 12 is fixedly connected with mounting plate 10, the bottom end of described lifting guide rail 12 is fixedly connected with device box 11, and described lifting guide rail 12 There is a lifting slider matched with it on the top, and a screw nut matched with it is provided on the screw 13. The top of the screw 13 is connected to the mounting plate 10 in rotation, and the bottom end of the screw 13 penetrates into the In the device box 11 and connected with the device box 11 in rotation, the bottom end of the screw 13 is provided with a synchronous wheel 14, and a synchronous belt 15 is wound between the synchronous wheels 14 at the bottom ends of the screw 13 on both sides. A plurality of pulleys 44 matched with the timing belt 15 are provided. A lifting motor is installed in the device box 11, and the lifting motor is connected with the lead screw 13 on one side. The two sides of the teaching board 3 are provided with a lifting box 16, and the screw nut and the lifting slider are fixed. Connected to the lifting box 16, the inside of the lifting box 16 is provided with LED lights, and the two ends of the optical fiber 8 are respectively inserted into the lifting box 16 on the same side and fixed in the lifting box 16. The front side of the teaching board 3 is provided with an automatic cleaning device 9 horizontally slidingly connected thereto. The mounting plate 10 is provided with a rack 17 and an upper slide rail 18 along the length direction, the upper slide rail 18 is provided with an upper slide block, and the lower side of the teaching board 3 is provided with a slide rail 19 along the length direction, The lower rail 19 is provided with a lower slider, and the automatic cleaning device 9 includes a vertically arranged cleaning box body 20, a power box body 21 and a dirt collection box body 22. The rolling brush 23 that is used to clean writing board 6 is arranged, and described cleaning box body 20 is the box body that the inside is provided with opening, and one end of described cleaning box body 20 openings is provided with rubber scraper 24, and the end of described rubber scraper 24 The section is arc-shaped, and its inner end is in contact with the writing board 6. The other end of the opening of the cleaning box body 20 is provided with a baffle 25, and the baffle 25 is inserted into the roller brush 23 and the baffle 25 is provided with a There are comb teeth for combing the roller brush 23, the top of the cleaning box body 20 communicates with the power box body 21, and the top end of the roller brush 23 stretches into the power box body 21 and is provided with a rotating gear 26. Brush 23 is rotationally connected with power box body 21, and described power box body 21 is equipped with cleaning motor, and the output end of described cleaning motor is connected with power gear 27, and described power gear 27 is meshed with rotating gear 26, and described power The box body 21 is rotatably connected with a travel gear 28, the travel gear 28 meshes with the power gear 27, the peripheral side of the travel gear 28 protrudes from the power box body 21 and meshes with the rack 17, the power box The body 21 is fixedly connected with the upper slider, the top of the dirt collecting box body 22 communicates with the bottom end of the cleaning box body 20, and the dirt collecting box body 22 is fixedly connected with the slide down. The cleaning box body 20 includes a dirt collecting bucket 29 whose top is connected with the cleaning box body 20, and the bottom end of the dirt collecting bucket 29 is provided with an internal thread, and the dirt collecting bucket 29 is provided with an inner box adapted to it. 30. The bottom end of the inner box 30 is provided with an external thread threadedly connected with the internal thread, the top end of the inner box 30 is provided with an elastic bell mouth 31, and the bottom end of the inner box 30 is provided with a twist handle. A light shield 47 is provided on the back side of the frame body 1 , and the light shield 47 is adapted to the frame body 1 when the mirror 5 is unfolded. The opening of the light blocking cover 47 is connected to the peripheral side of the frame body 1 , and a plurality of hooks are provided on the periphery of the frame body 1 , and a hanging rope for connecting the hooks is provided at the opening of the light blocking cover 47 . The bottom of the frame body 1 is provided with a base 45 , and casters 46 are installed on the bottom surface of the base 45 .

Claims (8)

1. A rear-projection projection teaching integrated device, characterized in that: it includes a frame (1), a projector (2), and a teaching board (3), and the bottom of the frame (1) is provided with a seat slot (4 ), the projector (2) is arranged in the seat slot (4), and the projector (2) projects in an upward and rearward direction, and the back side of the frame (1) is provided with a retractable reflector Mirror (5), the teaching board (3) is installed on the middle and upper part of the frame (1), the front of the teaching board (3) is provided with a transparent acrylic writing board (6), the writing board (6) The rear side is provided with a rear projection screen (7), the writing board (6) is provided with an optical fiber filament (8) capable of lifting, and the two ends of the optical fiber filament (8) are provided with Bright light source, the front side of the teaching board (3) is provided with an automatic cleaning device (9) horizontally slidingly connected with it, and the top side of the teaching board (3) is provided with a mounting device fixedly connected with the frame body (1). board (10), the bottom side of the teaching board (3) is provided with a device box (11) along the length direction, and both sides of the teaching board (3) are equipped with lifting guide rails (12) and lead screws (13) , the top of the lifting guide rail (12) is fixedly connected to the mounting plate (10), the bottom end of the lifting guide rail (12) is fixedly connected to the device box (11), and the lifting guide rail (12) is provided with a Coordinated lifting slider, the screw nut (13) is provided with a screw nut matched with it, the top of the screw (13) is rotatably connected with the mounting plate (10), and the bottom of the screw (13) The end penetrates in the device box (11) and is connected with the device box (11) in rotation. The bottom end of the screw (13) is provided with a synchronous wheel (14), and the synchronous wheel (14) at the bottom of the screw (13) on both sides ) is wound with a synchronous belt (15), and a lifting motor is installed in the device box (11), and the lifting motor is connected with the lead screw (13) on one side, and the teaching board (3) Lifting boxes (16) are arranged on both sides, and the wire nut and the lifting slider are fixedly connected to the lifting box (16). The inside of the lifting box (16) is provided with LED lights, and the two sides of the optical fiber wire (8) Ends are respectively inserted into the lifting box (16) of the same side and fixed in the lifting box (16). 2. A rear-projection projection teaching integrated device according to claim 1, characterized in that: the top side of the teaching board (3) is provided with a mounting board (10) fixedly connected to the frame body (1), the The mounting plate (10) is provided with a rack (17) and an upper slide rail (18) along the length direction, the upper slide rail (18) is provided with an upper slider, and the lower side of the teaching board (3) A lower rail (19) is installed along the length direction, the lower rail (19) is provided with a lower slider, and the automatic cleaning device (9) includes a vertically arranged cleaning box body (20), a power box body (21 ) and the dirt collection box (22), the vertical brush (23) for cleaning the writing board (6) is provided in the clean box (20), and the clean box (20) is provided on the inside A box body with an opening, one end of the opening of the cleaning box body (20) is provided with a rubber scraper (24), the section of the rubber scraper (24) is arc-shaped, and its inner end is connected with the writing board (6) In contact with each other, the other end of the opening of the cleaning box (20) is provided with a baffle (25), the baffle (25) is inserted into the roller brush (23) and the baffle (25) is provided with a brush for combing. The comb teeth of the rolling brush (23), the top of the cleaning box body (20) communicates with the power box body (21), and the top end of the rolling brush (23) stretches into the power box body (21) and is provided with Rotate the gear (26), the rolling brush (23) is rotationally connected with the power box body (21), a cleaning motor is installed in the power box body (21), and the output end of the cleaning motor is connected with a power gear (27 ), the power gear (27) is meshed with the rotating gear (26), and the power box (21) is rotatably connected with a traveling gear (28), and the traveling gear (28) is in phase with the power gear (27) Engagement, the peripheral side of the travel gear (28) protrudes from the power box (21) and meshes with the rack (17), the power box (21) is fixedly connected with the upper slider, and the dirt collection The top of the box body (22) communicates with the bottom end of the cleaning box body (20), and the dirt collection box body (22) is fixedly connected with the lower slider. 3. A rear-projection projection teaching integrated device according to claim 2, characterized in that: the cleaning box (20) includes a dirt collection bucket (29) whose top end communicates with the cleaning box (20), the The bottom of the dirt-collecting barrel (29) is provided with an internal thread, and the inner box (30) adapted to it is provided in the dirt-collecting barrel (29), and the bottom of the inner box (30) is provided with an inner thread. The external thread of the threaded connection, the top of the inner box (30) is provided with an elastic bell mouth (31), and the bottom of the inner box (30) is provided with a twist handle. 4. A rear-projection teaching integrated device according to claim 2, characterized in that: the rolling brush (23) includes a brush shaft, and the brush shaft is provided with bristles, and the bristles and the writing board (6 ) in contact, the comb teeth are matched with the bristles, and the top of the brush shaft is rotatably connected with the power box body (21). 5. A rear-projection projection teaching integrated device according to claim 1, characterized in that: the two sides of the reflector (5) are provided with frame plates (32), and the two sides on the back of the frame body (1) Side symmetry is provided with upper hinged seat (33) and lower hinged seat (34), and upper pivoted arm (35) is hinged on described upper hinged seat (33), and the end of described upper pivoted arm (35) and frame board (32) is hinged at the top, the lower hinged seat (34) is hinged with the lower arm (36), the end of the lower arm (36) is provided with a connecting shaft (37), and the connecting shaft (37) The end of the end is provided with bull's-eye ball (38), and the middle and lower part of described frame plate (32) is provided with chute (39), and described bull's-eye ball (38) is arranged in the chute (39) and with chute ( 39) Sliding connection, both sides of the frame body (1) are provided with an upper bracket (40) and a lower bracket (41), and the upper bracket (40) is provided with an upper arm (35) Corresponding to the upper card slot, the lower bracket (41) is provided with a lower card slot corresponding to the lower arm (36), and the outer side of the lower arm (36) is provided with a hook (42), Both sides of the frame body (1) are provided with buckles (43) matched with hooks (42). 6 . A rear-projection teaching integrated device according to claim 1 , characterized in that: the device box ( 11 ) is provided with a plurality of pulleys ( 44 ) matched with the timing belt ( 15 ). 7. A rear-projection projection teaching integrated device according to claim 1, characterized in that: the bottom of the frame (1) is provided with a base (45), and casters are installed on the bottom surface of the base (45) (46). 8. A rear-projection projection teaching integrated device according to claim 1, characterized in that: the back side of the frame (1) is provided with a light shield (47), and the light shield (47) is An inverted U-shaped cover with an opening downward, the inner side of the light blocking cover (47) is connected to both sides of the frame body (1), the top surface of the light blocking cover (47) is provided with creases, and the light blocking cover (47) is provided with creases. The side of photomask (47) is provided with the opening with zipper.