CN114428442A

CN114428442A - Think political affairs teaching liftable projection curtain

Info

Publication number: CN114428442A
Application number: CN202210245588.1A
Authority: CN
Inventors: 戴莉萍; 刘婷; 陈爱平
Original assignee: Jiangxi College of Applied Technology
Current assignee: Jiangxi College of Applied Technology
Priority date: 2022-03-14
Filing date: 2022-03-14
Publication date: 2022-05-03

Abstract

The invention relates to a curtain, in particular to a think political affairs teaching liftable projection curtain. The invention provides a think political affairs teaching liftable projection curtain which can be wound and stored and is convenient to move. The utility model provides a think political affairs teaching liftable projection curtain, comprising a base plate, the universal wheel, the stay tube, a supporting plate, the supporting shoe, the dwang, connecting rod and slide bar etc. symmetry rotary type is equipped with the universal wheel around the bottom plate bottom left and right sides is equal, the equal slidingtype in bottom plate top left and right sides is equipped with the stay tube, be connected with the backup pad between two stay tube upsides, be equipped with the supporting shoe in the middle of the backup pad front portion, the equal rotary type in supporting shoe left and right sides is equipped with the dwang, the equal rotary type of two dwang upsides is equipped with the connecting rod, the equal rotary type and slidingtype of two connecting rod upsides are equipped with the slide bar. The invention can be moved more conveniently under the action of the universal wheels, and is convenient to use outdoors.

Description

Think political affairs teaching liftable projection curtain

Technical Field

The invention relates to a curtain, in particular to a think political affairs teaching liftable projection curtain.

Background

Ideological and political education is that society or social group use certain thought concept, political view, moral standard, exert purposeful, planned, organized influence to its member, make them form the social practice activity that accords with the thought morality that certain society required, need carry out ideological and political education to the student in ideological and political teaching field, in the teaching, often need use ideological and political data and video to play the explanation, then need use the projector to carry out the explanation to the curtain, thus supplementary teaching, in order to improve the teaching quality.

A floor type electric liftable projection curtain with the publication number of CN211318979U relates to the technical field of electric projection curtains, and comprises a shell, a curtain, a scroll mechanism and a lifting support; the scroll mechanism consists of a motor and a winding drum, and the lower end of the curtain is connected with the winding drum and wound on the winding drum; the curtain lifting support consists of a cross beam and four connecting rods, the cross beam and the shell form a hexagonal structure, and can be accommodated in the shell in a retracting state and can support a curtain in an unfolding state; the connecting rod and the cross beam are supported by a pneumatic spring, and the upper end of the curtain is fixed on the cross beam; the driving motor rotates forwards to wind the curtain, and the curtain pulls the lifting support to retract; the driving motor rotates reversely to release the curtain, and the lifting support realizes the complete unfolding of the curtain under the support of the pneumatic spring; the curtain has the advantages that the curtain is unfolded and stored through the motor, the curtain has strong stability during unfolding, the size is very small during storage, and the curtain is convenient to carry.

To above problem, make further improvement to the curtain in this aspect now, need design one kind not only can wind and accomodate, still be convenient for simultaneously think political affairs teaching liftable projection curtain that removes.

Disclosure of Invention

In order to overcome the defects that the existing projection curtain is inconvenient to move and the layout of the curtain is influenced, the invention has the technical problems that: the utility model provides a think political affairs teaching liftable projection curtain that not only can convolute and accomodate, still be convenient for simultaneously remove.

A lifting projection curtain for ideological and political affairs teaching comprises a bottom plate, universal wheels, supporting tubes, supporting plates, supporting blocks, rotating rods, connecting rods, sliding rods, a first connecting block, a winding drum, a first rotating shaft, projection cloth, a lifting mechanism, a winding mechanism, a pulling mechanism and a pressing mechanism, wherein the universal wheels are symmetrically and rotatably arranged on the left side and the right side of the bottom plate in a front-back symmetrical mode, the supporting tubes are slidably arranged on the left side and the right side of the top of the bottom plate, the supporting plates are connected between the upper sides of the two supporting tubes, the supporting blocks are arranged in the middle of the front portion of the supporting plates, the rotating rods are rotatably arranged on the left side and the right side of the supporting blocks, the connecting rods are rotatably arranged on the upper sides of the two rotating rods, the first connecting block is slidably arranged between the front sides of the two sliding rods, the winding drum is arranged on the front side of the supporting plates, the winding mechanism comprises a first connecting block, a first rotating shaft, projection cloth, a second connecting block, a lifting mechanism and a winding mechanism.

In a preferred embodiment of the present invention, the lifting mechanism includes an electric push rod, a connecting shaft and a limiting block, the electric push rod is slidably disposed in the middle of the supporting plate, the connecting shaft is disposed on the electric push rod telescopic rod, the limiting block is disposed on the front side of the connecting shaft, and the limiting block is slidably connected to the two sliding rods.

In a preferred embodiment of the invention, the winding mechanism comprises second connecting blocks, a driving motor, second rotating shafts, belt pulleys, flat belts, worms and worm wheels, the second connecting blocks are arranged on the left and right sides of the bottom of the supporting plate, the driving motor is arranged on the left second connecting block, the second rotating shaft is arranged on an output shaft of the driving motor, the second rotating shafts are rotatably arranged on the right second connecting block, the belt pulleys are connected to the rear sides of the two second rotating shafts through keys, the flat belts are sleeved between the two belt pulleys, the worms are arranged on the front sides of the two second rotating shafts, the worm wheels are arranged on the left and right sides of the first rotating shaft, the two worms are meshed with the worm wheels on the same side, and the worm wheels are meshed with the worm wheels to enable the first rotating shafts to rotate automatically to wind the projection cloth.

In a preferred embodiment of the invention, the pulling mechanism comprises a connecting spring, a third connecting block, a reel, a pull rope, a gear ring, a latch and a return spring, the connecting spring is connected between the middle parts of two rotating rods and the winding drum, the lower ends of the two connecting springs are respectively connected on the left side and the right side of the winding drum, the upper ends of the two rotating rods are respectively provided with the third connecting block, the gear ring is sleeved between the two second rotating shafts, the inner rings of the two gear rings are in a gear groove shape, the middle parts of the two second rotating shafts are respectively provided with three latches in a circumferential annular sliding manner, both surfaces of each latch are inclined surfaces, the return spring is connected between each latch and the second rotating shaft on the same side, each three latches which are closer to each other are positioned at the position of the inner rings of the gear rings on the same side and are in clamping fit with the gear groove inner rings on the same side, the outer rings of the two gear rings are respectively provided with the reel, the pull rope is wound on the two reels, and the two pull ropes are connected with the third connecting block at the same side.

In a preferred embodiment of the invention, the pressing mechanism comprises a pressing block, an extension spring and a squeezing rod, the bottom of the electric push rod is provided with the pressing block which can roll the projection cloth more thoroughly, the extension spring is connected between the right side of the pressing block and the bottom of the supporting block, the left side of the rear part of the pressing block is provided with the squeezing rod, and the squeezing rod is in contact fit with the rotating rod on the left side.

In a preferred embodiment of the invention, the dust cleaning device further comprises a cleaning mechanism capable of cleaning dust on the projection cloth, the cleaning mechanism comprises a fourth connecting block, cleaning cotton and a return spring, the fourth connecting block is arranged on the front side of the upper part of the winding cylinder, the cleaning cotton is arranged on the fourth connecting block in a sliding mode, the return springs are connected between the left side and the right side of the front part of the cleaning cotton and the fourth connecting block, the projection cloth is located between the fourth connecting block and the cleaning cotton, and the projection cloth can move along with the cleaning cotton along with the fourth connecting block.

In a preferred embodiment of the invention, the projection cloth height adjusting device further comprises an adjusting mechanism capable of adjusting the projection cloth height, the adjusting mechanism comprises a support frame, a servo motor, a threaded rod and a guide rod, the support frame is arranged on the left side of the bottom plate, the servo motor is arranged on the support frame, the threaded rod is arranged on an output shaft of the servo motor, the lower portion of the threaded rod is rotatably connected with the bottom plate, the threaded rod is connected with the inside of the support tube on the left portion in a threaded connection mode, the guide rod is arranged on the right side in the bottom plate, and the guide rod is slidably connected with the inside of the support tube on the right portion.

In a preferred embodiment of the present invention, the universal wheel is made of ABS plastic.

The invention provides a think political affairs teaching liftable projection curtain, which has the following advantages: 1. the invention can be moved more conveniently under the action of the universal wheels, and is convenient to use outdoors;

2. the electric push rod is operated to drive the first connecting block to move downwards through the sliding rod, so that the first connecting block drives the projection cloth to move downwards and loosen, and meanwhile, the driving motor is operated to rotate the first rotating shaft to roll the projection cloth, so that the projection cloth can be wound and stored, the occupied area is reduced, and meanwhile, the projection cloth is prevented from being damaged;

3. according to the invention, through the matching of the gear ring and the latch, after the rotating rod rotates to the limit, the latch cannot hinder the rotation of the second rotating shaft, and the projection cloth can be continuously rolled or unfolded, so that the expansion and rolling of the projection cloth are smoothly carried out;

4. the projection cloth can be cleaned under the action of the cleaning cotton, and the projection cloth can move along with the cleaning cotton when being rolled or unfolded, so that the projection cloth can be fully wiped by the cleaning cotton, the projection cloth does not need to be cleaned manually, and the cleaning mode is easier and more convenient;

5. through the operation of servo motor for the threaded rod drives the stay tube of left part and removes, can upwards or move down the stay tube of right part at will, and then the height of adjustable projection cloth, applicable in the show of the projecting apparatus picture of co-altitude.

Drawings

Fig. 1 is a schematic perspective view of a first embodiment of the present invention.

Fig. 2 is a schematic perspective view of a second embodiment of the present invention.

Fig. 3 is a partial perspective view of the present invention.

Fig. 4 is a schematic perspective view of the lifting mechanism of the present invention.

Fig. 5 is a schematic perspective view of the winding mechanism of the present invention.

Fig. 6 is a schematic perspective view of the pulling mechanism of the present invention.

Fig. 7 is a partial cross-sectional view of the pulling mechanism of the present invention.

Fig. 8 is a schematic perspective view of the pressing mechanism of the present invention.

Fig. 9 is a schematic perspective view of a first cleaning mechanism of the present invention.

Fig. 10 is a schematic perspective view of a second cleaning mechanism of the present invention.

Fig. 11 is a schematic perspective view of an adjusting mechanism according to the present invention.

In the above drawings: 1-base plate, 2-universal wheel, 3-support tube, 4-support plate, 5-support block, 6-rotation rod, 7-connection rod, 8-sliding rod, 9-first connection block, 10-winding tube, 11-first rotation shaft, 12-projection cloth, 13-lifting mechanism, 130-electric push rod, 131-connection shaft, 132-limit block, 14-winding mechanism, 140-second connection block, 141-driving motor, 142-second rotation shaft, 143-belt pulley, 144-flat belt, 145-worm, 146-worm wheel, 15-pulling mechanism, 150-connection spring, 151-third connection block, 152-winding wheel, 153-pull rope, 154-toothed ring, 155-latch, 156-a return spring, 16-a pressing mechanism, 160-a pressing block, 161-an extension spring, 162-a squeezing rod, 17-a cleaning mechanism, 170-a fourth connecting block, 171-cleaning cotton, 172-a return spring, 18-an adjusting mechanism, 180-a supporting frame, 181-a servo motor, 182-a threaded rod and 183-a guide rod.

Detailed Description

The invention is further described below with reference to the figures and examples.

Example 1

A lifting projection curtain for thinking and political affairs teaching is shown in figures 1-3, and comprises a bottom plate 1, universal wheels 2, support tubes 3, a support plate 4, a support block 5, a rotary rod 6, a connecting rod 7, a sliding rod 8, a first connecting block 9, a winding drum 10, a first rotary shaft 11, a projection cloth 12, a lifting mechanism 13, a winding mechanism 14, a pulling mechanism 15 and a pressing mechanism 16, wherein the universal wheels 2 which can make the device move more conveniently are arranged on the left side and the right side of the bottom plate 1 in a front-back symmetrical rotating mode, the universal wheels 2 are made of ABS plastic materials which have good impact resistance and long service life, the support tubes 3 are arranged on the left side and the right side of the top of the bottom plate 1 in a sliding mode, the support plate 4 is connected between the upper sides of the two support tubes 3, the support block 5 is welded in the middle of the front part of the support plate 4, the rotary rods 6 are arranged on the left side and the right side of the support block 5 in a rotating mode, the connecting rod 7 is arranged on the upper sides of the two rotary rods 6 in a rotating mode, the upper sides of the two connecting rods 7 are in equal rotation type and sliding type and are provided with sliding rods 8, a first connecting block 9 is arranged between the front sides of the two sliding rods 8 in a sliding mode, the sliding rods 8 can slide on the first connecting block 9, a winding drum 10 is welded on the front side of the supporting plate 4, the first connecting block 9 can be in contact with the winding drum 10 when moving downwards to the limit, a first rotating shaft 11 is arranged in the winding drum 10 in a rotating mode, projection cloth 12 is connected to the first rotating shaft 11, the first rotating shaft 11 can wind the projection cloth 12, the upper end of the projection cloth 12 penetrates through the winding drum 10 to be connected with the first connecting block 9, a lifting mechanism 13 capable of containing the projection cloth 12 is arranged on the supporting plate 4, a winding mechanism 14 capable of automatically winding the projection cloth 12 is arranged at the bottom of the supporting plate 4, a pulling mechanism 15 is arranged on the winding mechanism 14, and a pressing mechanism 16 is arranged on the lifting mechanism 13.

As shown in fig. 1, fig. 2 and fig. 4, the lifting mechanism 13 includes an electric push rod 130, a connecting shaft 131 and a limiting block 132, the electric push rod 130 capable of moving the projection cloth 12 downwards for winding is slidably disposed in the middle of the supporting plate 4, the connecting shaft 131 is disposed on an expansion link of the electric push rod 130, the limiting block 132 is disposed on the front side of the connecting shaft 131, and the limiting block 132 is slidably connected to the two sliding rods 8.

As shown in fig. 1, 2 and 5, the winding mechanism 14 includes a second connecting block 140, a driving motor 141, a second rotating shaft 142, a belt pulley 143, a flat belt 144, worm gears 145 and a worm gear 146, the second connecting block 140 is disposed on the left and right sides of the bottom of the supporting plate 4, the driving motor 141 capable of automatically winding the projection cloth 12 is mounted on the left second connecting block 140, the second rotating shaft 142 is disposed on an output shaft of the driving motor 141, the second rotating shaft 142 is also rotatably disposed on the right second connecting block 140, the belt pulleys 143 for transmission are respectively connected to the rear sides of the two second rotating shafts 142 through a key, the flat belt 144 is sleeved between the two belt pulleys 143, the worm gears 145 are respectively disposed on the front sides of the two second rotating shafts 142, the worm gears 146 are respectively disposed on the left and right sides of the first rotating shaft 11, and the two worm gears 145 are respectively engaged with the worm gears 146 on the same side.

As shown in fig. 1, 2, 6 and 7, the pulling mechanism 15 includes a connecting spring 150, a third connecting block 151, a reel 152, a pull rope 153, a toothed ring 154, latch teeth 155 and a return spring 156, the connecting spring 150 is connected between the middle of two rotating rods 6 and the winding drum 10, the lower ends of the two connecting springs 150 are respectively connected to the left and right sides of the winding drum 10, the third connecting block 151 is welded to the upper ends of the two rotating rods 6, the toothed ring 154 is sleeved between the two second rotating shafts 142, the inner rings of the two toothed rings 154 are both in the shape of a toothed groove, three latch teeth 155 are circumferentially and annularly and slidably arranged between the two second rotating shafts 142, two surfaces of each latch tooth 155 are both inclined surfaces, the return spring 156 is connected between each latch tooth 155 and the second rotating shaft 142 on the same side, each three latch teeth 155 close to each other are both located at the inner ring positions of the toothed ring 154 on the same side and are in the latch engagement with the toothed grooves of the inner rings 154 on the same side, reels 152 are welded to the outer rings of the two gear rings 154, pull ropes 153 capable of pulling the rotating rod 6 to rotate are wound on the two reels 152, and the two pull ropes 153 are connected with the third connecting block 151 on the same side.

As shown in fig. 2 and 8, the pressing mechanism 16 includes a pressing block 160, an extension spring 161 and a pressing rod 162, the bottom of the electric push rod 130 is provided with the pressing block 160 capable of moving the electric push rod 130 downward, the extension spring 161 for resetting is connected between the right side of the pressing block 160 and the bottom of the support block 5, the pressing rod 162 is welded to the left side of the rear portion of the pressing block 160, and the pressing rod 162 is in contact fit with the rotating rod 6 on the left side.

When people need to use the device, people can push the device to enable the universal wheel 2 to rotate, the universal wheel 2 can rotate by three hundred sixty degrees, the device is more convenient to move, people can move the device to a proper position through the universal wheel 2, the device can also be used outdoors, the projection cloth 12 is in an expansion state at the beginning, people can use a projector to project images on the projection cloth 12, the projection cloth 12 can reduce the influence of ambient light on the image expression, the displayed image effect is better, thus being convenient for teachers to teach thought political courses under the action of the projection cloth 12, when the course is finished and the device is not needed to be used, people need to roll the projection cloth 12, the driving motor 141 and the electric push rod 130 can be started to operate, the electric push rod 130 is in an extension state at the beginning, after the electric push rod 130 is started, the telescopic rod of the electric push rod 130 is shortened to drive the connecting shaft 131 and the limiting block 132 to move downwards, the output shaft of the driving motor 141 rotates to drive the second rotating shaft 142 at the left part to rotate, and further drive the belt pulley 143 at the left part and the flat belt 144 to rotate, the belt pulley 143 at the right part and the second rotating shaft 142 at the right part are driven to rotate by the flat belt 144, the two second rotating shafts 142 rotate to drive the worm 145 to rotate, so that the worm 145 drives the worm wheel 146 to rotate, the worm wheel 146 drives the first rotating shaft 11 to rotate, the first rotating shaft 11 pulls the projection cloth 12 to rotate and roll, the projection cloth 12 can move downwards and roll onto the first rotating shaft 11, and further roll into the winding drum 10, the limiting block 132 moves downwards to drive the sliding rod 8 to move downwards, so that the sliding rod 8 drives the first connecting block 9 to move downwards, and the first connecting block 9 can drive the upper end of the projection cloth 12 to move downwards, so that the projection cloth 12 is gradually loosened, then the first rotating shaft 11 gradually winds up the projection cloth 12, the sliding rod 8 moves downwards to drive the connecting rod 7 to rotate, the sliding rod 8 also slightly slides on the connecting rod 7 to make the connecting rod 7 rotate more smoothly, the sliding rod 8 moves downwards to slide on the first connecting block 9 in different ranges along with the rotating angle of the connecting rod 7, and when the limiting block 132 drives the sliding rod 8 to move downwards, the sliding rod 8 also slides on the limiting block 132 to not influence the rotation of the connecting rod 7, at the same time, the second rotating shaft 142 rotates to drive the latch 155 to rotate, the latch 155 can drive the gear ring 154 to rotate, so that the gear ring 154 drives the reel 152 to rotate, the reel 152 pulls the pull rope 153, the pull rope 153 can be wound on the reel 152, the pull rope 153 moves downwards to pull the third connecting block 151 to move downwards, so that the third connecting block 151 drives the rotating rod 6 to rotate, the connecting spring 150 is compressed, the rotating rod 6 rotates to enable the connecting rod 7 to move downwards while rotating, the rotating rod 6 at the left part rotates to push the extrusion rod 162 to drive the extrusion rod 162 to move downwards, the extension spring 161 is extended to further drive the electric push rod 130 to move downwards, and the lifting mechanism 13 integrally moves downwards, so that the electric push rod 130 self moves downwards while shortening the telescopic rod, the projection cloth 12 cannot be completely rolled up only by the shortened distance of the electric push rod 130 telescopic rod, so that the electric push rod 130 self moves downwards by the pulling mechanism 15, the projection cloth 12 is rolled more thoroughly, the angle of the rotating rod 6 required to rotate is smaller than that of the connecting rod 7, when the rotating rod 6 rotates to the limit, the electric push rod 130 telescopic rod continues to shorten, and the second rotating shaft 142 and the latch 155 continue to rotate, and the reel 152 cannot continue to rotate, so that the latch 155 is stopped by the protrusion on the tooth socket, the latch 155 continues to rotate, the return spring 156 is compressed due to the inward movement of the inclined surface of the latch 155, so that the latch 155 can stagger the tooth ring 154 to continue to rotate, when the latch 155 is no longer in contact with the protrusion on the tooth socket on the tooth ring 154, the latch 155 can move outward under the reset action of the return spring 156 to reset the latching tooth socket, the second rotating shaft 142 continuously rotates, so that the latch 155 is continuously pressed to stagger the tooth ring 154, the tooth ring 154 cannot influence the rotation of the second rotating shaft 142, when the projection cloth 12 is fully rolled onto the first rotating shaft 11, the first connecting block 9 will be in contact with the rolling cylinder 10, so that the electric push rod 130 and the driving motor 141 can be closed, and the projection cloth 12 can be automatically rolled under the action of the driving motor 141, meanwhile, the projection cloth 12 is rolled more stably through the electric push rod 130, the rolling of the projection cloth 12 can be more thoroughly and completely performed through the pressing mechanism 16, when people need to unfold the projection cloth 12 again, people can start the electric push rod 130 and the driving motor 141 to run in reverse, so that the output shaft of the driving motor 141 rotates in reverse to drive the second rotating shaft 142 at the left part to rotate in reverse, so that the second rotating shaft 142 at the left part drives the two belt pulleys 143 and the flat belt 144 to rotate in reverse, the belt pulley 143 at the right part drives the second rotating shaft 142 at the right part to rotate in reverse, the two second rotating shafts 142 rotate in reverse to drive the worm 145 to rotate in reverse, so that the worm 145 drives the worm wheel 146 to rotate in reverse, the worm wheel 146 drives the first rotating shaft 11 to rotate in reverse to loosen the projection cloth 12, and the telescopic rod of the electric push rod 130 rotating in reverse can extend, the connecting shaft 131 and the limiting block 132 are driven to move upwards for resetting, so that the limiting block 132 drives the sliding rod 8 to move upwards, the sliding rod 8 can slide on the limiting block 132 while moving, the sliding rod 8 can drive the first connecting block 9 to move upwards by moving upwards, so that one end of the projection cloth 12 driven by the first connecting block 9 is unfolded upwards, the first connecting block 9 is no longer in contact with the winding drum 10, meanwhile, the sliding rod 8 drives the connecting rod 7 to rotate reversely, and also drives the latch 155 to rotate reversely while the second rotating shaft 142 rotates reversely, so that the latch 155 can drive the gear ring 154 and the reel 152 to rotate reversely, so that the reel 152 is loosened, the pull rope 153 is loosened, at this time, the rotating rod 6 can rotate reversely under the resetting action of the connecting spring 150, and then drive the third connecting block 151 to rotate reversely, so that the third connecting block 151 pulls the pull rope 153 to move upwards, the rotating rod 6 reversely rotates to enable the connecting rod 7 to rotate and move upwards simultaneously, so that the connecting spring 150 is gradually reset, the left rotating rod 6 reversely rotates to no longer block the extrusion rod 162, the lower pressing block 160 drives the extrusion rod 162 to move upwards to reset under the reset action of the extension spring 161, the lower pressing block 160 further drives the electric push rod 130 to move upwards to reset, so that the electric push rod 130 extends and also moves upwards to reset, the projection cloth 12 can be unfolded more fully and completely, after the rotating rod 6 reversely rotates to the limit, the driving motor 141 can continuously reversely rotate to enable the second rotating shaft 142 to continuously rotate reversely, so that the second rotating shaft 142 drives the latch 155 to continuously rotate, the latch 155 cannot continuously rotate due to the gear ring 154, the latch 155 can intermittently move inwards due to the inclined plane of the latch, and the reset spring 156 can play a role in buffering for the latch 155, the latch 155 rotates the intermittent staggered toothed ring 154, the driving motor 141 continues to run reversely, the projection cloth 12 continues to be unfolded upwards, and after the projection cloth 12 is completely unfolded upwards, people can close the driving motor 141 and the electric push rod 130, and then the device can be used.

Example 2

On the basis of embodiment 1, as shown in fig. 1, 9 and 10, the device further includes a cleaning mechanism 17, the cleaning mechanism 17 includes a fourth connecting block 170, cleaning cotton 171 and a return spring 172, the front side of the upper portion of the winding drum 10 is connected with the fourth connecting block 170 by a screw connection, the cleaning cotton 171 capable of cleaning the projection cloth 12 is slidably disposed on the fourth connecting block 170, the return springs 172 for buffering are connected between the left and right sides of the front portion of the cleaning cotton 171 and the fourth connecting block 170, the projection cloth 12 is located between the fourth connecting block 170 and the cleaning cotton 171, and the projection cloth 12 can move along with the cleaning cotton 171 and the fourth connecting block 170.

When the projection cloth 12 is unfolded, the projection cloth 12 is inevitably stained with some dust, when the projection cloth 12 is wound on the first rotating shaft 11, the projection cloth 12 is adhered to the cleaning cotton 171 and is wound on the first rotating shaft 11 in a downward moving mode, so that the cleaning cotton 171 wipes the projection cloth 12, the dust remained on the projection cloth 12 can be wiped, the return spring 172 can buffer the cleaning cotton 171 and prevent the cleaning cotton 171 from obstructing the movement of the projection cloth 12, before the device is used, people need to spray special cleaning water on the cleaning cotton 171, when the projection cloth 12 is unfolded, the cleaning cotton 171 can wipe the projection cloth 12, so that the projection cloth 12 can be cleaned in both unfolding and recycling modes, the service life of the projection cloth 12 is prolonged, and meanwhile manual cleaning is not needed.

As shown in fig. 1, fig. 2 and fig. 11, the projection device further comprises an adjusting mechanism 18, the adjusting mechanism 18 comprises a support frame 180, a servo motor 181, a threaded rod 182 and a guide rod 183, the left side of the bottom plate 1 is connected with the support frame 180 in a bolt connection mode, the servo motor 181 capable of automatically adjusting the height of the projection cloth 12 is installed on the support frame 180, the threaded rod 182 is arranged on an output shaft of the servo motor 181, the lower portion of the threaded rod 182 is rotatably connected with the bottom plate 1, the threaded rod 182 is connected with the inside of the left support tube 3 in a threaded connection mode, the guide rod 183 is arranged on the right side in the bottom plate 1, and the guide rod 183 is slidably connected with the inside of the right support tube 3.

When people use the device, people can also adjust the overall height of the device, and further the projection cloth 12 is suitable for displaying pictures with different heights, people start the servo motor 181 to operate, so that the output shaft of the servo motor 181 rotates to drive the threaded rod 182 to rotate, the threaded rod 182 can drive the support tube 3 at the left part to move upwards, the support tube 3 at the left part drives the support plate 4 and the support tube 3 at the right part to move upwards, the support tube 3 at the right part can move upwards along the guide rod 183, so that the support plate 4 can move more stably, the projection cloth 12 can move upwards to adjust the height, so that the height of the projection cloth 12 can be adjusted to be increased, after the projection cloth 12 is adjusted to a proper height, the servo motor 181 is closed, and the servo motor 181 can be controlled by people to operate reversely, so that the threaded rod 182 rotates reversely, and the support tube 3 at the left part can be driven to move downwards, and then drive backup pad 4 and the stay tube 3 of right part and move down, the stay tube 3 of right part just slides down along guide bar 183, and then makes projection cloth 12 move down with the height-adjusting down, and the part of connecting on backup pad 4 will wholly also move down, so alright with the height-adjusting down of projection cloth 12, increase the practicality.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims

1. A liftable projection curtain for thinking political affairs teaching comprises a bottom plate (1), universal wheels (2), supporting tubes (3), supporting plates (4), supporting blocks (5), rotating rods (6), connecting rods (7), sliding rods (8), a first connecting block (9), a winding cylinder (10), a first rotating shaft (11) and projection cloth (12), wherein the universal wheels (2) are symmetrically arranged on the left side and the right side of the bottom plate (1) in a front-back symmetrical rotating mode, the supporting tubes (3) are arranged on the left side and the right side of the top of the bottom plate (1) in a sliding mode, the supporting plates (4) are connected between the upper sides of the two supporting tubes (3), the supporting blocks (5) are arranged in the middle of the front portions of the supporting plates (4), the rotating rods (6) are arranged on the left side and the right side of the rotating plates (5) in a rotating mode, the connecting rods (7) are arranged on the upper sides of the two connecting rods (7) in a sliding mode, a first connecting block (9) is arranged between the front sides of the two sliding rods (8) in a sliding manner, the sliding rods (8) can slide on the first connecting block (9), a winding drum (10) is arranged on the front side of the support plate (4), the first connecting block (9) can be contacted with the winding drum (10) when moving downwards to the limit, a first rotating shaft (11) is arranged in the winding drum (10) in a rotating manner, projection cloth (12) is connected onto the first rotating shaft (11), the upper end of the projection cloth (12) penetrates through the winding drum (10) to be connected with the first connecting block (9), the projection cloth (12) can be wound through the rotation of the first rotating shaft (11), the device is characterized by further comprising a lifting mechanism (13), a winding mechanism (14), a pulling mechanism (15) and a pressing mechanism (16), the lifting mechanism (13) is arranged on the support plate (4), the winding mechanism (14) is arranged at the bottom of the support plate (4), the winding mechanism (14) can automatically complete the winding work of the projection cloth (12), the winding mechanism (14) is provided with a pulling mechanism (15), and the lifting mechanism (13) is provided with a pressing mechanism (16).

2. The lifting projection curtain for ideological and political affairs teaching according to claim 1, wherein the lifting mechanism (13) comprises an electric push rod (130), a connecting shaft (131) and a limiting block (132), the electric push rod (130) is slidably arranged in the middle of the supporting plate (4), the connecting shaft (131) is arranged on a telescopic rod of the electric push rod (130), the limiting block (132) is arranged on the front side of the connecting shaft (131), and the limiting block (132) is slidably connected with the two sliding rods (8).

3. The lifting projection curtain for the political thought teaching according to claim 2, wherein the winding mechanism (14) comprises second connecting blocks (140), a driving motor (141), second rotating shafts (142), belt pulleys (143), flat belts (144), worms (145) and worm gears (146), the second connecting blocks (140) are arranged on the left side and the right side of the bottom of the support plate (4), the driving motor (141) is arranged on the second connecting block (140) on the left portion, the second rotating shafts (142) are arranged on an output shaft of the driving motor (141), the second rotating shafts (142) are also rotatably arranged on the second connecting block (140) on the right portion, the belt pulleys (143) are connected with the rear sides of the two second rotating shafts (142) through keys, the flat belts (144) are sleeved between the two belt pulleys (143), the worms (145) are arranged on the front sides of the two second rotating shafts (142), the worm gears (146) are arranged on the left side and the right side of the first rotating shaft (11), the two worms (145) are meshed with the worm wheel (146) on the same side, and the worm (145) is meshed with the worm wheel (146) to enable the first rotating shaft (11) to automatically rotate to wind the projection cloth (12).

4. The liftable projection curtain for political thought teaching according to claim 3, wherein the pulling mechanism (15) comprises a connecting spring (150), a third connecting block (151), a reel (152), a pull rope (153), a gear ring (154), latch teeth (155) and a return spring (156), the connecting spring (150) is connected between the middle parts of the two rotating rods (6) and the winding drum (10), the lower ends of the two connecting springs (150) are respectively connected to the left side and the right side of the winding drum (10), the third connecting block (151) is respectively arranged at the upper ends of the two rotating rods (6), the gear ring (154) is respectively sleeved between the two second rotating shafts (142), the inner rings of the two gear rings (154) are both in a gear groove shape, the three latch teeth (155) are respectively arranged in the middle parts of the two second rotating shafts (142) in an annular sliding manner along the circumferential direction, both surfaces of each latch tooth (155) are inclined surfaces, the return spring (156) is respectively connected between each latch tooth (155) and the second rotating shaft (142) on the same side, every three block teeth (155) that are close to all are located the position of ring gear (154) inner circle of homonymy to with the ring gear (154) inner circle tooth's socket joint cooperation of homonymy, two ring gear (154) outer circles all are equipped with reel (152), all around stay cord (153) on two reels (152), two stay cords (153) all link to each other with third connecting block (151) of homonymy.

5. The liftable projection curtain for political thought teaching according to claim 4, wherein the pressing mechanism (16) comprises a pressing block (160), a tension spring (161) and an extrusion rod (162), the pressing block (160) which can roll the projection cloth (12) more thoroughly is arranged at the bottom of the electric push rod (130), the tension spring (161) is connected between the right side of the pressing block (160) and the bottom of the supporting block (5), the extrusion rod (162) is arranged at the left side of the rear part of the pressing block (160), and the extrusion rod (162) is in contact fit with the rotating rod (6) at the left side.

6. The lifting projection curtain for the thinking political affairs teaching according to claim 5, characterized by further comprising a cleaning mechanism (17) capable of cleaning dust on the projection cloth (12), wherein the cleaning mechanism (17) comprises a fourth connecting block (170), cleaning cotton (171) and a return spring (172), the fourth connecting block (170) is arranged on the front side of the upper portion of the winding drum (10), the cleaning cotton (171) is slidably arranged on the fourth connecting block (170), the return springs (172) are respectively connected between the left side and the right side of the front portion of the cleaning cotton (171) and the fourth connecting block (170), the projection cloth (12) is located between the fourth connecting block (170) and the cleaning cotton (171), and the projection cloth (12) can move along with the fourth connecting block (170) and the cleaning cotton (171).

7. The lifting projection curtain for ideological and political affairs teaching according to claim 6, characterized by, still include can be to projection cloth (12) height adjustment mechanism (18), adjustment mechanism (18) is including support frame (180), servo motor (181), threaded rod (182) and guide bar (183), bottom plate (1) bottom left side is equipped with support frame (180), be equipped with servo motor (181) on support frame (180), be equipped with threaded rod (182) on servo motor (181) output shaft, threaded rod (182) lower part links to each other with bottom plate (1) rotary type, and threaded rod (182) link to each other through threaded connection's mode with the stay tube (3) inside of left part, right side is equipped with guide bar (183) in bottom plate (1), guide bar (183) link to each other with the inside slidingtype of right part stay tube (3).

8. The ideological and political education liftable projection curtain as claimed in claim 1, wherein the universal wheels (2) are made of ABS plastic.