CN113393714B

CN113393714B - A articulate subassembly entirely for classroom projection curtain

Info

Publication number: CN113393714B
Application number: CN202110705540.XA
Authority: CN
Inventors: 陈怀喜; 陈浩; 王炜
Original assignee: Anhui Guoyao Communication Technology Co ltd
Current assignee: Anhui Guoyao Communication Technology Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2022-09-20
Anticipated expiration: 2041-06-24
Also published as: CN113393714A

Abstract

The invention discloses a full-hanging movable assembly for a classroom projection curtain, which relates to the technical field of hanging equipment of the projection curtain, and particularly relates to a full-hanging movable assembly for the classroom projection curtain, which comprises a curtain main body and a shell, wherein the upper end of the curtain main body is arranged in the shell, a fixed frame is welded on the rear side surface of the shell, three mounting plates are welded at the upper end of the fixed frame at equal intervals, the upper end of the curtain main body is inserted into the shell, curtain edge seals are sleeved outside four outer edges of the curtain main body, and the lower end of the curtain edge seal is connected with a curtain hanging rod: the curtain support is matched with the fixing mechanism, so that the curtain is supported and fixed, the curtain main body is prevented from shaking, and the curtain is prevented from deforming and curling; through the locking mechanism who sets up, it is fixed to lock the curtain jib, makes the lower extreme of curtain overturn backward simultaneously, makes the curtain be in the state of straining, can not only effectually prevent that the curtain from rocking, prevents moreover that the curtain from taking place the fold phenomenon, makes the projection effect better.

Description

A articulate subassembly entirely for classroom projection curtain

Technical Field

The invention relates to the technical field of hanging equipment of projection curtains, in particular to a full-hanging movable assembly for a classroom projection curtain.

Background

A projector, also called a projector, is a device that can project images or videos onto a curtain, and can be connected with a computer, a VCD, a DVD, a BD, a game machine, a DV, etc. through different interfaces to play corresponding video signals. With the development of society and the rapid development of the internet, projectors are widely applied in life, the projectors are displayed to be a common information propagation means no matter in a teaching place or a public place, the requirements of more people are met, and the projector curtain is used as a direct acting object of projection and plays a very important role in the projection.

The current projecting apparatus curtain has obvious drawback at the in-process of in-service use, and some projecting apparatus curtains are direct to be fixed through the support frame, but the support frame can not shrink, uses very occupation place in the classroom, and receives the collision easily and damages. Some projector curtains are hung on the wall through storage boxes, and the projector curtains are not provided with supporting devices in order to reduce occupied space, so that the projector curtains cannot be well fixed, and are easy to shake in actual use, so that students are influenced to watch the projector curtains; because the projector screen is made of soft materials, the projector screen usually generates the phenomena of deformation, curling and wrinkling after being used for a long time, which not only affects the appearance, but also affects the projection effect.

Therefore, we propose a fully articulated moving assembly for classroom projection curtains to solve the above drawbacks.

Disclosure of Invention

The invention aims to provide a fully-articulated moving assembly for a classroom projection curtain, which solves the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme: a full-hanging moving assembly for a classroom projection curtain comprises a curtain main body and a shell, wherein the upper end of the curtain main body is arranged in the shell, a fixing frame is welded on the rear side face of the shell, three mounting plates are welded on the upper end of the fixing frame in an equidistance manner, the upper end of the curtain main body is inserted into the shell, curtain edge sealing rings are sleeved outside four outer edges of the curtain main body, a curtain hanging rod is connected to the lower end of the curtain edge sealing rings, soft magnets are symmetrically arranged on the left side and the right side of the curtain edge sealing rings, an upper supporting frame is connected to the lower end of the fixing frame through bolts, hanging rings are arranged at the lower end of the upper supporting frame through nylon ropes, folding rods are symmetrically arranged at the left end and the right end of the upper supporting frame, a fixing mechanism is arranged on each folding rod, the lower end of each folding rod is rotatably connected with a lower supporting frame, a hook is welded at the upper end of the lower supporting frame, and the lower end of the lower supporting frame is connected with a curved plate through a connecting rod, curtain banding and the inseparable laminating of curved plate, both ends symmetry is provided with the fixed plate about the lower carriage, be provided with locking mechanism on the fixed plate, locking mechanism's upper end is provided with positioning mechanism, spacing seat and curtain jib joint among the locking mechanism.

Preferably, the fixing frame and the mounting plate are both provided with mounting holes and are fixed on the wall body through bolts.

Preferably, the fixed plate is an L-shaped plate, and the upper end of the fixed plate is welded with the lower end of the lower support frame.

Preferably, the upper end bilateral symmetry welding of lower carriage has the installation piece, it has the installation screw to run through the grafting on the installation piece, threaded connection has the expansion pipe on the installation screw, the expansion pipe is pegged graft in the wall body.

Preferably, the folding bar comprises: two movable rods, the tip of two movable rods passes through hinge connection, and the one end of one of them movable rod is passed through the pin rod and is rotated with last support frame and be connected, and the one end of another movable rod is passed through the pin rod and is rotated with lower carriage and be connected, has all seted up the rectangular channel on two movable rods, the left and right sides symmetry of rectangular channel has seted up flutedly, and the link of two movable rods all inlays and has had strong magnetism, and two strong magnetism adsorb each other together.

Preferably, the fixing mechanism includes: the slider is symmetrically adhered to the left side and the right side of the hard magnet, the hard magnet is connected with the rectangular groove in a sliding mode, the slider is connected with the groove in a sliding mode, the limiting springs are symmetrically adhered to the upper end and the lower end of the hard magnet, the limiting springs are connected with the rectangular groove in an inserting mode, and the hard magnet is connected with the soft magnet in an adsorbing mode.

Preferably, the locking mechanism comprises: spacing seat, spacing groove, spout, semicircular plate, skewed tooth and semicircular ring shape slide, spacing seat and fixed plate welding, the spacing groove has been seted up on the spacing seat, the spout has been seted up to the left and right sides symmetry of spacing groove, sliding connection has the semicircular plate in the spacing groove, the lateral surface equidistance welding of semicircular plate has the skewed tooth, the left and right sides face symmetrical welding of semicircular plate has semicircular ring shape slide, semicircular ring shape slide and spout sliding connection.

Preferably, the positioning mechanism comprises: the steel rope fixing device comprises a concave seat, a pawl, a positioning spring, a steel rope, a pull ring, a movable groove, a first ratchet wheel and a second ratchet wheel, wherein the concave seat is welded with a fixing plate, the movable groove is formed in the upper end of the inner side of the concave seat, the pawl is rotatably connected in the movable groove through a pin rod, the positioning spring is inserted between the pawl and the concave seat, the upper end of the pawl is welded with the lower end of the steel rope, the upper end of the steel rope penetrates through the concave seat to be welded with the pull ring, the concave seat is rotatably connected with the first ratchet wheel through the pin rod, the side face of the first ratchet wheel is welded with the second ratchet wheel, and the second ratchet wheel is rotatably connected with the concave seat through the pin rod.

Preferably, the steel rope penetrates through the inner side of the positioning spring, the steel rope is in sliding connection with the concave seat, the lower end of the positioning spring is inserted into the pawl, and the upper end of the positioning spring is inserted into the concave seat.

Preferably, the first ratchet wheel and the second ratchet wheel are the same in structure size, the ratchet teeth of the first ratchet wheel and the ratchet teeth of the second ratchet wheel are arranged in opposite directions, and the first ratchet wheel is clamped with the helical teeth.

Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable structure and strong functionality, and has the following advantages:

1. the curtain support is opened downwards by outwards opening the folding rod through the arranged upper support frame, the lower support frame and the folding rod, the ends of the two movable rods are firmly and fixedly connected together after being butted by utilizing the arranged strong magnetism, and the curtain support is fixed, so that the projection curtain is supported;

2. through the arranged fixing mechanism, after the curtain is opened downwards, soft magnets in the curtain sealing edge and hard magnets on the movable rod are adsorbed together in a one-to-one correspondence mode, so that the curtain is tightly attached to the movable rod, the phenomenon that the curtain main body shakes in the using process is effectively prevented, and meanwhile, the curtain sealing edge is sleeved outside the curtain main body and fixed on the movable rod through the soft magnets, so that the phenomena that the curtain deforms and curls are prevented;

3. through the locking mechanism who sets up, through manual with the curtain jib rotate backward, make the both ends of curtain jib all block go into locking mechanism in, lock fixedly to the curtain jib, make the lower extreme of curtain overturn backward simultaneously, make the curtain be in the state of tightly stretching, can not only effectually prevent that the curtain from rocking, prevent moreover that the curtain from taking place the fold phenomenon, make the projection effect better.

Drawings

FIG. 1 is a schematic front view of a projection screen support apparatus according to the present invention;

FIG. 2 is a schematic cross-sectional view of a projection screen support apparatus according to the present invention;

FIG. 3 is an enlarged view of the structure at A in FIG. 2;

FIG. 4 is an enlarged view of the structure at B in FIG. 2;

FIG. 5 is a schematic view of a projection screen support according to the present invention;

FIG. 6 is a schematic view of the movable rod and the fixing mechanism of the present invention;

fig. 7 is a schematic structural diagram of a locking mechanism and a positioning mechanism of the invention.

In the figure: 1. a housing; 11. a fixed mount; 12. mounting a plate; 2. a curtain main body; 21. sealing edges of the curtain; 22. a curtain boom; 23. soft magnetic iron; 3. an upper support frame; 31. hanging a ring; 32. a lower support frame; 33. hooking; 34. a fixing plate; 35. mounting a block; 36. an expansion tube; 37. mounting screws; 38. a curved plate; 4. a movable rod; 41. a rectangular groove; 42. a groove; 43. strong magnetism; 5. hard magnet; 51. a slider; 52. a limiting spring; 6. a limiting seat; 61. a limiting groove; 62. a chute; 7. a semi-annular plate; 71. helical teeth; 72. a semi-circular sliding plate; 8. a concave seat; 81. a pawl; 82. a positioning spring; 83. a steel cord; 84. a pull ring; 85. a movable groove; 9. a first ratchet wheel; 91. a second ratchet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 7, the present invention provides a technical solution: the utility model provides a articulate entirely and move subassembly for classroom projection curtain, including curtain main part 2 and shell 1, the upper end setting of curtain main part 2 is in shell 1, the trailing flank welding of shell 1 has mount 11, the upper end equidistance welding of mount 11 has three mounting panel 12, the mounting hole has all been seted up on mount 11 and the mounting panel 12, mount 11 and mounting panel 12 pass through the bolt fastening on the wall body, hang shell 1 in the wall body upper end through mount 11 and mounting panel 12, and is convenient to use, and save classroom space.

The upper end of curtain main part 2 is pegged graft at shell 1, and four outside overlaps of curtain main part 2 are equipped with curtain banding 21, and the lower extreme of curtain banding 21 is connected with curtain jib 22, can add the balancing weight on the curtain jib 22, and it is more stable when making curtain main part 2 open downwards, through the curtain banding 21 that sets up, prevents that curtain main part 2 from taking place the phenomenon of deformation and turn-up at the in-process that uses.

The left and right sides symmetry of curtain banding 21 is provided with soft magnet 23, there is upper strut frame 3 lower extreme of mount 11 through bolted connection, there is link 31 lower extreme of upper strut frame 3 through the nylon rope system, upper strut frame 3's both ends symmetry about is provided with the folding rod, the lower extreme of folding rod rotates and is connected with lower carriage 32, the welding of lower carriage 32's upper end has couple 33, be connected with link 31 through couple 33, pack up the back when the curtain support and fix the curtain support, prevent that lower carriage 32 from landing downwards.

The folding rod includes: two movable rods 4, hinge connection is passed through to the tip of two movable rods 4, the one end of one of them movable rod 4 is passed through the pin rod and is rotated with upper bracket 3 and be connected, the one end of another movable rod 4 is passed through the pin rod and is rotated with under carriage 32 and be connected, rectangular channel 41 has all been seted up on two movable rods 4, recess 42 has been seted up to the left and right sides symmetry of rectangular channel 41, the link of two movable rods 4 is all inlayed and is had strong magnetism 43, two strong magnetism 43 mutual absorptions are in the same place, with the under carriage 32 lapse, outwards open the folding rod, make two movable rods 4 external rotation open, thereby open the curtain support downwards, strong magnetism 43 mutual adsorption through two movable rods 4 tip, make the firm fixed connection after the tip butt joint of two movable rods 4 together, thereby make the curtain support fixed.

The welding of the upper end bilateral symmetry of under bracing frame 32 has installation piece 35, it has mounting screw 37 to run through the grafting on installation piece 35, threaded connection has expansion pipe 36 on the mounting screw 37, expansion pipe 36 is pegged graft in the wall body, when fixed to the curtain support, also can fix under bracing frame 32 on the wall body through mounting screw 37, the round hole has been seted up on the wall body in advance, it is internal to insert expansion pipe 36 in advance in the wall body, fix under bracing frame 32 through expansion pipe 36 and mounting screw 37, thereby fix the curtain support.

Be provided with fixed establishment on the folding rod, fixed establishment is including: hard magnet 5, slider 51 and spacing spring 52, slider 51 has been pasted to the left and right sides symmetry of hard magnet 5, hard magnet 5 and rectangular channel 41 sliding connection, slider 51 and recess 42 sliding connection, spacing spring 52 has been pasted to the upper and lower both ends symmetry of hard magnet 5, spacing spring 52 and rectangular channel 41 grafting, hard magnet 5 and soft magnet 23 adsorption connection, spacing spring 52 applys for elasticity to hard magnet 5, when the downward motion of curtain banding 21, soft magnet 23 drives hard magnet 5 and slides downwards along rectangular channel 41.

The lower extreme of lower carriage 32 is connected with curved plate 38 through the connecting rod, and curtain banding 21 closely laminates with curved plate 38, and both ends symmetry is provided with fixed plate 34 about lower carriage 32, and fixed plate 34 is the L shaped plate, and the upper end of fixed plate 34 welds with the lower extreme of lower carriage 32, and curved plate 38 is used for supporting fixed curtain banding 21, makes curtain banding 21 drive curtain main part 2 and is in the state of tautness.

The fixing plate 34 is provided with a locking mechanism, and the locking mechanism comprises: spacing seat 6, spacing groove 61, spout 62, semi-annular board 7, skewed tooth 71 and semicircle annular slide 72, spacing seat 6 welds with fixed plate 34, spacing groove 61 has been seted up on spacing seat 6, spout 62 has been seted up to the left and right sides symmetry of spacing groove 61, sliding connection has semi-annular board 7 in the spacing groove 61, skewed tooth 71 is welded to the lateral surface equidistance of semi-annular board 7, the symmetric welding of the left and right sides face of semi-annular board 7 has semicircle annular slide 72, semicircle annular slide 72 and spout 62 sliding connection, it is fixed to lock curtain jib 22 through spacing seat 6 and the cooperation of semi-annular board 7.

Locking mechanism's upper end is provided with positioning mechanism, and spacing seat 6 among the locking mechanism and curtain jib 22 joint, positioning mechanism including: the steel wire rope fixing device comprises a concave seat 8, a pawl 81, a positioning spring 82, a steel wire rope 83, a pull ring 84, a movable groove 85, a first ratchet wheel 9 and a second ratchet wheel 91, wherein the concave seat 8 is welded with a fixing plate 34, the upper end of the inner side of the concave seat 8 is provided with the movable groove 85, the movable groove 85 is connected with the pawl 81 in a rotating mode through a pin rod, the positioning spring 82 is inserted between the pawl 81 and the concave seat 8, the upper end of the pawl 81 is welded with the lower end of the steel wire rope 83, the steel wire rope 83 penetrates through the inner side of the positioning spring 82, the steel wire rope 83 is connected with the concave seat 8 in a sliding mode, the lower end of the positioning spring 82 is inserted into the pawl 81, the upper end of the positioning spring 82 is inserted into the concave seat 8, the upper end of the steel wire rope 83 penetrates through the concave seat 8 and is welded with the pull ring 84, the pull ring 84 is pulled upwards, and the pull ring 84 drives the steel wire rope 83 and the pawl 81 to move upwards.

The inside of the concave seat 8 is rotatably connected with a first ratchet wheel 9 through a pin rod, the side surface of the first ratchet wheel 9 is welded with a second ratchet wheel 91, the first ratchet wheel 9 and the second ratchet wheel 91 are identical in structure size, the directions of the ratchet teeth of the first ratchet wheel 9 and the ratchet teeth of the second ratchet wheel 91 are opposite, the first ratchet wheel 9 is clamped with the inclined teeth 71, the second ratchet wheel 91 is rotatably connected with the concave seat 8 through the pin rod, the second ratchet wheel 91 is fixed through a pawl 81, the second ratchet wheel 91 and the first ratchet wheel 9 are prevented from rotating clockwise, the inclined teeth 71 cannot rotate clockwise outwards, the semi-annular plate 7 cannot rotate downwards, and the curtain suspension rod 22 is firmly locked and fixed through the locking mechanism.

The working principle is as follows: when needs use the projection curtain, take off the couple 33 of lower carriage 32 upper end from link 31 earlier, stimulate lower carriage 32 downwards again, open the folding rod outwards, make two movable rod 4 outwards rotatory open, thereby open the curtain support downwards, when two movable rod 4 are in the vertical state, open the completion promptly, strong magnetism 43 through two movable rod 4 tip adsorbs each other, make firmly fixed connection after the tip butt joint of two movable rod 4 together, thereby make the curtain support fixed, the curtain support can upwards pack up when not using, the space in classroom has been saved promptly, prevent the danger of collision when the student walks about simultaneously.

After curtain main part 2 is opened downwards, make the soft magnet 23 in the curtain banding 21 adsorb together with 5 one-to-one of hard magnet on the movable rod 4, thereby make the close subsides of curtain main part 2 on the movable rod 4, thereby the effectual in-process that prevents curtain main part 2 and using takes place to rock the phenomenon, simultaneously because the outside cover of curtain main part 2 is equipped with curtain banding 21, and curtain banding 21 passes through soft magnet 23 to be fixed on movable rod 4, thereby prevent that curtain main part 2 from taking place the phenomenon of deformation and turn-up at the in-process that uses, the life of curtain main part 2 has been prolonged.

When the curtain is opened downwards and fixed preliminarily, the curtain hanging rod 22 is rotated backwards manually, so that two ends of the curtain hanging rod 22 are clamped into the limiting seat 6, the semi-annular plate 7 is rotated upwards along the limiting groove 61, the semi-annular sliding plate 72 is rotated upwards along the sliding groove 62, the semi-annular plate 7 is prevented from being dislocated, the curtain hanging rod 22 is locked and fixed through the matching of the limiting seat 6 and the semi-annular plate 7, in the upward rotation process of the semi-annular plate 7, the inclined teeth 7 at the upper end of the semi-annular plate 7 are clamped with the first ratchet wheel 9, as the first ratchet wheel 9 and the second ratchet wheel 91 are welded, the second ratchet wheel 91 is fixed through the pawl 81, the second ratchet wheel 91 and the first ratchet wheel 9 are prevented from rotating clockwise, so that the inclined teeth 71 cannot rotate clockwise outwards, the semi-annular plate 7 cannot rotate downwards, so that the curtain hanging rod 22 is firmly locked and fixed by the locking mechanism, and the lower end of the curtain main body 2 is turned backwards while the curtain hanging rod 22 rotates backwards, the curtain main body 2 is in a tight state, so that the curtain main body 2 can be effectively prevented from shaking, the curtain main body 2 is prevented from wrinkling, and the projection effect is better; when the curtain main body 2 needs to be folded, the pull ring 84 is pulled upwards, the pawl 81 is driven to rotate upwards through the steel rope 83, the pawl 81 is enabled to loosen the fixation of the second ratchet wheel 91, at the moment, the curtain suspension rod 22 can be taken out from the limiting seat 6 only by rotating the semi-annular plate 7 downwards, and therefore the curtain main body 2 can be folded.

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

Claims

1. The utility model provides a articulate entirely and move subassembly for classroom projection curtain, includes curtain main part (2) and shell (1), and the upper end setting of curtain main part (2) is in shell (1), its characterized in that: the rear side face of the shell (1) is welded with a fixing frame (11), three mounting plates (12) are welded at the upper end of the fixing frame (11) at equal intervals, the upper end of the curtain main body (2) is inserted into the shell (1), curtain sealing edges (21) are sleeved outside four outer edges of the curtain main body (2), the lower end of each curtain sealing edge (21) is connected with a curtain hanging rod (22), soft magnets (23) are symmetrically arranged on the left side and the right side of each curtain sealing edge (21), the lower end of the fixing frame (11) is connected with an upper support frame (3) through bolts, the lower end of the upper support frame (3) is provided with a hanging ring (31) through a nylon rope system, folding rods are symmetrically arranged at the left end and the right end of the upper support frame (3), a fixing mechanism is arranged on each folding rod, the lower end of each folding rod is rotatably connected with a lower support frame (32), and hooks (33) are welded at the upper end of the lower support frame (32), the lower end of the lower support frame (32) is connected with a curved plate (38) through a connecting rod, the curtain edge sealing (21) is tightly attached to the curved plate (38), fixing plates (34) are symmetrically arranged at the left end and the right end of the lower support frame (32), a locking mechanism is arranged on each fixing plate (34), a positioning mechanism is arranged at the upper end of each locking mechanism, and a limiting seat (6) in each locking mechanism is clamped with a curtain hanging rod (22);

the locking mechanism comprises: the limiting seat (6), the limiting groove (61), the sliding groove (62), the semi-annular plate (7), the oblique teeth (71) and the semi-annular sliding plate (72), the limiting seat (6) is welded with the fixing plate (34), the limiting groove (61) is formed in the limiting seat (6), the sliding groove (62) is symmetrically formed in the left side and the right side of the limiting groove (61), the semi-annular plate (7) is connected in the limiting groove (61) in a sliding mode, the oblique teeth (71) are welded on the outer side face of the semi-annular plate (7) in an equidistant mode, the semi-annular sliding plate (72) is symmetrically welded on the left side face and the right side face of the semi-annular plate (7), and the semi-annular sliding plate (72) is connected with the sliding groove (62) in a sliding mode;

the positioning mechanism comprises: a concave seat (8), a pawl (81), a positioning spring (82), a steel rope (83), a pull ring (84), a movable groove (85), a first ratchet wheel (9) and a second ratchet wheel (91), the concave seat (8) is welded with the fixed plate (34), the upper end of the inner side of the concave seat (8) is provided with a movable groove (85), a pawl (81) is rotatably connected in the movable groove (85) through a pin rod, a positioning spring (82) is inserted between the pawl (81) and the concave seat (8), the upper end of the pawl (81) is welded with the lower end of the steel rope (83), the upper end of the steel rope (83) passes through the concave seat (8) and is welded with the pull ring (84), a first ratchet wheel (9) is rotatably connected in the concave seat (8) through a pin rod, the side welding of first ratchet (9) has second ratchet (91), second ratchet (91) are connected with concave seat (8) rotation through the pin rod.

2. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: mounting holes are formed in the fixing frame (11) and the mounting plate (12), and the fixing frame (11) and the mounting plate (12) are fixed on a wall body through bolts.

3. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: the fixing plate (34) is an L-shaped plate, and the upper end of the fixing plate (34) is welded with the lower end of the lower support frame (32).

4. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: the wall-mounted support is characterized in that mounting blocks (35) are welded at the left end and the right end of the lower support frame (32) in a bilateral symmetry mode, mounting screws (37) penetrate through the mounting blocks (35) in an inserted mode, expansion pipes (36) are connected to the mounting screws (37) in a threaded mode, and the expansion pipes (36) are inserted into a wall body in an inserted mode.

5. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: the folding rod comprises: two movable rods (4), the tip of two movable rods (4) passes through hinge connection, and the one end of one of them movable rod (4) is passed through the pin rod and is rotated with upper bracket (3) and be connected, and the one end of another movable rod (4) is passed through the pin rod and is rotated with under bracing frame (32) and be connected, has all seted up rectangular channel (41) on two movable rods (4), recess (42) have been seted up to the left and right sides symmetry of rectangular channel (41), and the link of two movable rods (4) all inlays and has strong magnetism (43), and two strong magnetism (43) adsorbs each other together.

6. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: the fixing mechanism comprises: hard magnet (5), slider (51) and spacing spring (52), slider (51) have been pasted to the left and right sides symmetry of hard magnet (5), hard magnet (5) and rectangular channel (41) sliding connection, slider (51) and recess (42) sliding connection, spacing spring (52) have been pasted to the upper and lower both ends symmetry of hard magnet (5), spacing spring (52) are pegged graft with rectangular channel (41), hard magnet (5) are connected with soft magnet (23) absorption.

7. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: the steel rope (83) penetrates through the inner side of the positioning spring (82), the steel rope (83) is in sliding connection with the concave seat (8), the lower end of the positioning spring (82) is connected with the pawl (81) in an inserting mode, and the upper end of the positioning spring (82) is connected with the concave seat (8) in an inserting mode.

8. A full hitch motion assembly for a classroom projection curtain as described in claim 1, wherein: the first ratchet wheel (9) and the second ratchet wheel (91) are identical in structure size, the directions of the ratchets of the first ratchet wheel (9) and the ratchets of the second ratchet wheel (91) are opposite, and the first ratchet wheel (9) is clamped with the helical teeth (71).