CN112233465B - A projection device for information technology teaching - Google Patents

Abstract

The invention discloses a projection device for information technology teaching, which comprises two groups of guide rails, wherein two groups of single plates are connected in the guide rails in a sliding way, the guide rail is also rotatably connected with a synchronous gear, the upper end and the lower end of the single plate are both connected with a synchronous rack meshed and connected with the synchronous gear, a projection curtain is arranged between two groups of synchronous gears, an adjusting mechanism capable of unfolding or folding the projection curtain when the single plate moves is arranged between the two groups of single plates and the guide rail, the projection device is used for information technology teaching, the projection curtain is arranged between the two single plates of the blackboard and is adjusted by the adjusting mechanism, so that the projection curtain can be unfolded and folded by pushing the single plates to move, the projection curtain can be folded and unfolded more quickly, thereby be convenient for pack up the regulation fast when projection curtain shielding plate book, and adjust simple and conveniently.

Description

A projection device for information technology teaching

technical field

The invention relates to the technical field of projection equipment, in particular to a projection equipment used for information technology teaching.

Background technique

In the classroom teaching of computer information technology, it is often necessary to use a projector to project educational information onto the screen, which is convenient for teaching. In the teaching of electronic information technology, especially in the teaching of multiple people, it is often necessary to use a projection device, such as a projector, for a long time. , used to dynamically describe the local structure of electronic components, software processes, etc. In the process of teaching, projectors are usually used.

In order to better carry out projection teaching in large classrooms, the existing projectors are installed directly under the top wall of the classroom, and a screen is set at the blackboard for projection, so it will take up a lot of space. In the half space of the blackboard, when there are many writing on the blackboard, it is necessary to put away the projection cloth or wipe off the original writing on the blackboard, so the use has certain limitations. To this end, we propose a projection device for information technology teaching.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a projection device for information technology teaching that can be contracted and expanded through the movement of the blackboard, so as to solve the problems raised in the above background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a projection device for information technology teaching, comprising two sets of guide rails, two sets of veneers are slidably connected in the guide rails, and synchronous gears are also rotatably connected to the guide rails. The upper and lower ends of the veneer are connected with synchronizing racks that are meshed with synchronizing gears, a projection screen is arranged between the two sets of synchronizing gears, and a projection screen is arranged between the two sets of veneers and the guide rails. An adjustment mechanism that unfolds or retracts the projection screen when moving.

Preferably, the adjustment mechanism includes two sets of rotating shafts for installing the synchronizing gears, one end of the rotating shafts is rotatably connected with a support block that is slidably connected to the single board, and between the two sets of the rotating shafts is connected a support block for rolling up the projection screen. The rod is retracted, a driving device for unfolding the projection screen is arranged in the support block, a control mechanism for controlling the driving device is arranged in one of the single boards, and a limiter for restricting the projection screen is arranged on the other group of the single boards. The positioning mechanism is used to control the driving device through the control mechanism, so as to facilitate the unfolding and retracting of the projection screen and facilitate switching.

Preferably, the driving device includes an ejector block arranged on the single board, an escape groove is provided on the support block for sliding connection with the ejector block, and the support block is slidably connected with the ejector block and the ejector block. The push block is slidingly connected, a first spring is connected between the ejection block and the ejection block, and one end of the projection screen is connected with a pull bar that is slidably connected to the support block and connected to the limit mechanism. When pressing, even if the two boards are not in the initial position, they can still be pressed.

Preferably, the limiting mechanism includes a limiting groove formed on the veneer that is adapted to the pulling bar, a plurality of groups of through holes are defined on the pulling bar, and a pressing bar is also slidably connected in the veneer, One side of the pressing bar is connected with a plurality of sets of limit rods extending into the through holes, a second spring is connected between the pressing bar and the single plate, and both ends of the pressing bar are connected with pushing and pressing bars The push block is provided on the support block with a push groove matching the push block, and the second spring is convenient for automatic clamping, thereby automatically limiting the position.

Preferably, the control mechanism includes two sets of wedges that are slidably connected in the single plate and are slidably connected to the ejector block, and between the two sets of the wedges are connected adjustment rods whose ends are threadedly connected with the adjustment rods. An external gear is arranged on the external gear, and an adjusting rack whose two ends are slidably connected to the veneer is meshed and connected to the external gear. The outer side of the adjusting rack is also connected with an adjusting block. The wedge moves, thereby pushing the ejector block for easy adjustment.

Preferably, two sets of rotating rings are rotatably connected to the adjusting rod, a driving gear is fixedly connected to the adjusting rod, and a plurality of sets of rotating rings are rotatably connected with the driving gear and the external gear respectively. This part of the mechanism constitutes a deceleration mechanism, so that the adjustment block can be pushed a small distance and the wedge block can move a large distance to complete the adjustment.

Preferably, a magnetic strip is connected to one side of the pulling bar, so as to keep the pulling bar stable.

Preferably, the end of the limiting rod is provided with a guide fillet, which is convenient for introduction into the round hole.

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

In the present invention, the projection screen is arranged between the two veneers of the blackboard, and the adjustment mechanism is used to adjust it, so that the projection screen can be unfolded and folded by pushing the veneer to move, and the projection screen can be moved more quickly. The curtain is folded and unfolded, so that it is convenient to quickly fold and adjust when the projection screen blocks the blackboard, and the adjustment is simple and convenient.

Description of drawings

Fig. 1 is the overall structure schematic diagram of the present invention;

Fig. 2 is the schematic diagram of partial structure development of the present invention;

Fig. 3 is the enlarged schematic diagram of the structure of A area in Fig. 2;

Fig. 4 is the enlarged schematic diagram of the structure of B area in Fig. 2;

Fig. 5 is a schematic diagram of partial structure development of the adjustment mechanism;

Figure 6 is a schematic diagram of the structure of a part of the limiting mechanism;

Fig. 7 is a schematic diagram of the partial structure of the control mechanism;

Fig. 8 is the enlarged schematic diagram of the structure of C area in Fig. 7;

FIG. 9 is an enlarged schematic diagram of the structure of the D region in FIG. 8 .

In the figure: 1-guide rail; 2-single plate; 3-synchronizing gear; 4-synchronizing rack; 5-projection screen; 6-adjustment mechanism; 7-rotating shaft; 8-support block; Drive device; 11-control mechanism; 12-limiting mechanism; 13-ejection block; 14-avoidance groove; 15-ejection block; 16-push block; 17-first spring; 18-pull bar; 19-limit Slot; 20-through hole; 21-pressing bar; 22-limiting rod; 23-second spring; 24-push block; 25-push slot; 26-wedge block; 27-adjustment rod; 28-external gear; 29 - Adjusting rack; 30 - Adjusting block; 31 - Rotating ring; 32 - Drive gear; 33 - Transmission gear; 34 - Magnetic strip.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1-9, the present invention provides a technical solution: a projection device for information technology teaching, comprising two sets of guide rails 1, and two sets of veneers 2 are slidably connected in the guide rails 1, and the guide rails 1 A synchronizing gear 3 is also rotatably connected to it, and the upper and lower ends of the single plate 2 are connected with a synchronizing rack 4 meshed with the synchronizing gear 3. The movable blackboard in the prior art has the same structure, a projection screen 5 is arranged between the two sets of the synchronizing gears 3, and a projection screen 5 is arranged between the two sets of the veneer 2 and the guide rail 1, which can be unfolded or retracted when the veneer 2 moves. The adjustment mechanism 6 of the projection screen 5 is activated, and the projection screen 5 is arranged between the two veneers 2 to facilitate deployment when needed, and retracted when not required, and is adjusted and controlled by the adjustment mechanism 6, which can both project and Switch out a part of the blackboard that is blocked for normal use, and further set a travel switch between the two single boards 2 to detect whether the projection screen 5 is unfolded. The projector screen is more convenient to use, and it does not need a projection screen like the current one. It takes a long time to fold and unfold, and it is inconvenient to switch.

The adjustment mechanism 6 includes two sets of rotating shafts 7 for installing the synchronizing gear 3, one end of the rotating shaft 7 is rotatably connected with a support block 8 that is slidably connected with the single plate 2, and between the two sets of the rotating shafts 7 is connected for rolling up the projection. The retracting rod 9 of the curtain 5, one end of the projection screen 5 is connected with the retracting rod 9, the rotating shaft 7 will unfold or retract the projection screen 5 when it rotates under the action of the synchronizing gear 3, and the support block 8 is provided with an unfolding projection screen. The driving device 10 of 5, wherein a control mechanism 11 for controlling the driving device 10 is provided in one group of the single boards 2 , and a limiting mechanism 12 for limiting the projection screen 5 is provided on the other group of the single boards 2 .

The driving device 10 includes an ejector block 13 disposed on the single plate 2, and an avoidance groove 14 slidably connected to the ejector block 13 is provided on the support block 8, and the avoidance groove 14 prevents the support block 8 from pressing the ejector block 13, so The support block 8 is slidably connected with an ejection block 15 and a push block 16 slidably connected with the ejection block 13. A first spring 17 is connected between the ejection block 15 and the ejection block 13, and is pushed by the ejection block 13. The block 16 further pushes the pop-up block 15. The first spring 17 can transmit force and also play a buffering role. Even when the pop-up block 15 is not pushed out, the push block 16 can still be pushed. One end is connected with a pulling bar 18 slidably connected with the support block 8 and connected with the limiting mechanism 12 . The pop-up block 15 pushes the pulling bar 18 out when pushed, thereby driving the projection screen 5 to unfold.

The limiting mechanism 12 includes a limiting slot 19 which is formed on the single board 2 and is adapted to the pulling bar 18 . The pulling bar 18 is provided with a plurality of groups of through holes 20 , and the single board 2 is also slidably connected with a pressing force. Bar 21, one side of the pressing bar 21 is connected with a plurality of sets of limit rods 22 extending into the through hole 20, the end of the limit rod 22 is provided with a guide fillet, and the guide fillet is more convenient to introduce, Because the pulling bar 18 needs to be fixed on the veneer 2 when it is pushed out by the ejection block 15, so as to be stably fixed and unfolded, the limit rod 22 needs to be inserted into the through hole 2O to stably limit it. One side is connected with the magnetic strip 34, because the inner diameter of the through hole 20 is larger than the outer diameter of the limit rod 22, so that it can be easily inserted, but this method is easy to cause it to shake easily, so the magnetic strip 34 is used to keep it stable. A magnetic strip is also arranged in the position slot 19, and a second spring 23 is connected between the pressing strip 21 and the single board 2. The spring 23 facilitates the automatic reset of the pressing strip 21, thereby facilitating automatic positioning. Both ends are connected with a push block 24 that pushes the pressing bar 21, and the support block 8 is provided with a push groove 25 that is adapted to the push block 24. Because the position limit needs to be lifted when the projection screen is retracted, the push groove 25 When the single board 2 returns to the initial position, the pressing bar 21 is pushed by blocking the push block 24, so that the limit rod 22 is moved to release the limit.

The control mechanism 11 includes two sets of wedges 26 that are slidably connected to the single plate 2 and are slidably connected to the ejector block 13 . Between the two sets of the wedges 26 are adjusting rods 27 threaded at both ends thereof. The adjusting rods 27 The threads at the two ends of the screw rod have opposite directions of rotation, so that when they rotate, the wedge blocks move toward or away from each other synchronously. The adjustment rod 27 is provided with an external gear 28, and the external gear 28 is meshed and connected with both ends and the veneer. 2. The adjusting rack 29 is slidably connected. The outer side of the adjusting rack 29 is also connected with an adjusting block 30. The setting of the adjusting block 30 is convenient for it to push the adjusting rack 29. The adjusting rack 29 then drives the external gear 28 to rotate. The adjusting rod 27 rotates to drive the wedge block 26 to control the position of the ejector block 13 .

Two sets of rotating rings 31 are rotatably connected to the adjusting rod 27 , and a driving gear 32 is fixedly connected to the adjusting rod 27 . The meshing and connected transmission gear 33 needs to adjust the rack 29 to move a larger distance when only the external gear 28 is present. Therefore, the drive gear 32, the external gear 28 and the transmission gear 33 constitute a planetary gear reduction mechanism, and the adjustment rod 27 The number of rotations is expanded, thereby reducing the moving range of the adjusting gear 29 and facilitating adjustment.

Under normal circumstances, when the projection screen 5 is not needed, the ejector block 13 is located inside the board 2, so the ejector block 15 will not push out the pull bar 18, so the projection screen 5 will not be pulled out. Push the adjusting rack 29, the adjusting rack 29 drives the external gear 28, and then the adjusting rod 27 is driven by the driving gear 32 and the transmission gear 33, and the adjusting rod 27 moves the wedge 26 away from the adjusting rod 27, and the wedge 26 passes through When the surface is inclined, the ejector block 13 is ejected, and the ejector block 13 and the veneer 2 are slidably connected and limited to prevent it from being ejected and detached. The ejector block 13 pushes the push block 16, and the push block 16 squeezes the first spring 17. When the veneer 2 does not move, the pop-up block 15 does not extend. At this time, the veneer 2 is pushed to return to the initial position. Under the action of the first spring 17, the pulling bar 18 enters the limit slot 19. And because of the action of the push groove 25 at this time, the push block 24 is blocked, so that the limit rod 22 does not move in the limit groove 19, and the single plate 2 is pushed again, and the push block 25 is not blocked. The limit rod 22 can limit the position, the device can be adjusted at any position, and the operation is simple and convenient.

1-guide rail; 2-veneer; 3-synchronizing gear; 4-synchronizing rack; 5-projection screen; 6-adjustment mechanism; 7-rotating shaft; 8-support block; 9-retracting rod; 10-drive device; 11-control mechanism; 12-limit mechanism; 13-ejection block; 14-avoidance slot; 15-ejection block; 16-push block; 17-first spring; 18-pull bar; 19-limit slot; 20 -Through hole; 21-Pressing bar; 22-Limiting rod; 23-Second spring; 24-Push block; 25-Push slot; 26-Wedge block; 27-Adjust rod; 28-External gear; 29-Adjust tooth bar; 30-adjustment block; 31-rotating ring; 32-drive gear; 33-transmission gear; 34-magnetic strip.

It should be noted that, in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, and substitutions can be made in these embodiments without departing from the principle and spirit of the invention and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (3)

1. A projection device for teaching information technology, comprising two sets of guide rails (1), characterized in that: two sets of veneers (2) are slidably connected in the guide rails (1), and two sets of veneers (2) are slidably connected in the guide rails (1). A synchronizing gear (3) is also rotatably connected, and the upper and lower ends of the single plate (2) are connected with a synchronizing rack (4) meshingly connected with the synchronizing gear (3). A projection screen (5) is provided, and an adjustment mechanism (6) capable of unfolding or retracting the projection screen (5) is provided between the two groups of the veneers (2) and the guide rails (1) when the veneer (2) moves , the adjustment mechanism (6) includes two sets of rotating shafts (7) for installing the synchronizing gear (3), and one end of the rotating shaft (7) is rotatably connected with a support block (8) that is slidably connected to the single plate (2). , a retracting rod (9) for rolling up the projection screen (5) is connected between the two sets of said rotating shafts (7), and a driving device (10) for unfolding the projection screen (5) is arranged in the support block (8) ), wherein a control mechanism (11) for controlling the driving device (10) is arranged in one group of the single plates (2), and a limit for limiting the projection screen (5) is arranged on the other group of the single plates (2). Mechanism (12), the driving device (10) comprises an ejection block (13) arranged on the single plate (2), and the support block (8) is provided with an escapement for sliding connection with the ejection block (13) A slot (14), a pop-up block (15) and a push block (16) slidingly connected with the ejector block (13) are slidably connected in the support block (8). 13) A first spring (17) is connected between, and one end of the projection screen (5) is connected with a pulling bar (18) slidingly connected with the support block (8) and connected with the limiting mechanism (12). The limiting mechanism (12) includes a limiting groove (19) which is provided on the single plate (2) and is adapted to the pulling bar (18), and a plurality of groups of through holes (20) are formed on the pulling bar (18). , the single plate (2) is also slidably connected with a pressing bar (21), and one side of the pressing bar (21) is connected with a plurality of sets of limit rods (22) extending into the through hole (20), A second spring (23) is connected between the pressing bar (21) and the single plate (2), and both ends of the pressing bar (21) are connected with push blocks (24) for pushing the pressing bar (21), The support block (8) is provided with a push groove (25) adapted to the push block (24). ) two sets of wedges (26) that are slidably connected, between the two sets of the wedges (26) are connected adjusting rods (27) whose ends are threadedly connected with them, the adjusting rods (27) are provided with external gears (27). 28), the external gear (28) is meshed with an adjusting rack (29) whose two ends are slidably connected to the veneer (2), and an adjusting block (30) is also connected to the outside of the adjusting rack (29). , the adjusting rod (27) is rotatably connected with two sets of rotating rings (31), the adjusting rod (27) is fixedly connected with a driving gear (32), and the two sets of rotating rings ( 31) are rotationally connected with a plurality of groups of transmission gears (33) which are respectively meshed with the drive gear (32) and the external gear (28). 2 . The projection device for information technology teaching according to claim 1 , wherein a magnetic strip ( 34 ) is connected to one side of the pulling bar ( 18 ). 3 . 3 . The projection device for information technology teaching according to claim 2 , wherein the end of the limiting rod ( 22 ) is provided with a guide fillet. 4 .

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