An automatic wall-mounted projector screen

Abstract

The present invention provides an automatic wall - sticking projector screen, belonging to the technical field of projection devices. The automatic wall - sticking projector screen includes: a reel, on the surface of the reel, a rotatable mandrel is embedded. The top end of the screen is fixed on the mandrel, and the screen is wound around the reel. An arc - shaped groove is formed on the surface of the reel, and an arc - shaped top block with the tail end rotatably engaged with the reel is arranged in the arc - shaped groove; a stop block, which is vertically arranged on the inner top wall of the housing in a lift - able manner, and the bottom end of the stop block contacts the surface of the screen; struts are arranged on both sides of the bottom of the housing. The struts are configured to have a retracted state and an extended state, and the struts have a deployment process synchronous with the screen. When the screen moves towards the wall side, the struts move towards the wall side synchronously and stick to the wall. The present invention has the advantages of automatically sticking to the wall to improve the stability of the screen and the viewing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of projection devices, and particularly to an automatic wall-attaching projector screen. Background Art

[0002] The projector screen is one of the most mainstream projection devices at present. Whether it is a suspended or floor-standing projection screen, the stability after its deployment directly affects the viewing effect. In the current stable settings for projector screens, there are methods of tightening the screen using a screen bracket and methods of fixing the screen after it is deployed. Since the wind resistance performance of the cloth surface is poor after the screen is deployed, once the screen is disturbed by air flow, the cloth surface will fluctuate, affecting the viewing effect. Especially for wall-mounted screens, there is a gap between the back of the screen and the wall after it is deployed. Once air flow passes through this gap, the cloth surface of the screen is very likely to fluctuate or shake. Summary of the Invention

[0003] To solve the above technical problems, the present invention proposes an automatic wall-attaching projector screen that can automatically attach to the wall to improve the stability of the screen and the viewing effect.

[0004] The technical solution of the present invention is realized as follows:

[0005] An automatic wall-attaching projector screen, comprising:

[0006] A reel, on the surface of which a rotatable mandrel is embedded. The top end of the screen is fixed on the mandrel, and the screen is wound around the reel. An arc-shaped groove is formed on the surface of the reel, and an arc-shaped top block with its tail end rotatably engaged with the reel is arranged in the arc-shaped groove. The radian between the tail end of the arc-shaped top block and the mandrel is 180°;

[0007] A housing, the reel is located inside the housing, and a screen channel is arranged at the bottom of the housing for the bottom end of the screen to extend out and for the screen to displace towards the wall;

[0008] A stop block, which is vertically arranged on the inner top wall of the housing in a liftable manner. The bottom end of the stop block contacts the surface of the screen. When the screen is deployed, the stop block continuously descends; when the screen is fully deployed and the mandrel is located at the bottom of the reel, the arc-shaped top block is located at the top of the reel. The arc-shaped top block is in an outwardly extended state with its top end outside the reel and its tail end surface abutted against the inner wall surface of the tail end of the arc-shaped groove, and the front end of the arc-shaped top block abuts against the stop block; wherein:

[0009] Arc-shaped rolling grooves are respectively arranged at both ends inside the housing. The arc-shaped rolling grooves are centered on the front end of the arc-shaped top block in the outwardly extended state. The width of the arc-shaped rolling grooves is set to be adapted to the end diameter of the reel, and both ends of the reel are inserted into the arc-shaped rolling grooves;

[0010] The outer surface of the first end plate is provided with a group of arc-shaped sliding grooves concentric with the arc-shaped rolling groove. A machine base that slidably mates with the arc-shaped sliding grooves is arranged outside the first end plate. The motor is installed on the machine base, and the reel is located at one end of the first end plate and passes through the arc-shaped rolling groove to be connected to the output shaft of the motor.

[0011] On both sides of the bottom of the housing, struts are provided. The struts are configured to have a retracted state and an extended state, and the struts have a deployment process synchronized with the curtain. When the curtain is displaced towards the wall side, the struts are displaced towards the wall side synchronously and adhere to the wall.

[0012] Further, the stopper includes a block with a semi-cylindrical bottom, a guide rod with its bottom end inserted into the block and its top end fixed to the inner top wall of the housing, and a stopper spring arranged between the bottom end of the guide rod and the block.

[0013] Further, third and fourth end plates are also provided at both ends of the housing, located on the sides of the first end plate and the second end plate respectively. The third and fourth end plates close both ends of the housing. The motor is slidably arranged between the first end plate and the third end plate, and a limiting spring is arranged on one side of the motor. The limiting spring is used to keep the motor and the reel at the starting end of the arc-shaped rolling groove, and the limiting spring is compressed when the reel moves from the starting end to the ending end of the arc-shaped rolling groove.

[0014] Further, the strut includes a rod body part and a rod base. The top end of the rod body part is rotatably connected to the rod base. The two rod bases are slidably arranged on the housing in the direction perpendicular to the wall surface through sliding seats, and the rod bases can be displaced in the height direction of their corresponding sliding seats.

[0015] Further, the sliding seat is in an "L" shape. A groove for the displacement of the sliding seat is provided at the bottom of the housing, and the bottom of the sliding seat is in the same plane as the bottom of the housing.

[0016] Further, a fifth end plate is provided in the inner direction of the first end plate, and a sixth end plate is provided in the inner direction of the second end plate. Through grooves adapted to the arc-shaped rolling groove are provided on the fifth end plate and the sixth end plate for the end of the reel to pass through. There are sliding seat channels for the vertical part of the sliding seat to displace between the first end plate and the fifth end plate and between the second end plate and the sixth end plate.

[0017] Further, an elastic telescopic rod is rotatably connected to the top of the vertical part of the sliding seat. Guide blocks are provided on both sides of the top end of the elastic telescopic rod. Guide grooves adapted to the guide blocks are provided on both side surfaces of the sliding seat channel. The guide grooves include a straight section and an arc section. Fulcrum columns are provided on one side of both side surfaces of the sliding seat channel corresponding to the arc section of the guide groove. A "U" - shaped sleeve block that sleeves on the fulcrum column when the guide block moves to the arc section is provided on the surface of the elastic telescopic rod, and the center of the arc of the arc section is the center of the fulcrum column.

[0018] Further, when the reel is located at the starting end of the arc-shaped rolling groove, the ejection telescopic rod is in a vertical state and contacts the reel, and the part of the elastic telescopic rod below the bottom of the reel extends along the circumferential surface of the reel towards one side of the reel and forms an arc-shaped groove with an angle of °.

[0019] Further, the support rod includes an upper rod body and a lower rod body which are distributed up and down and are rotationally matched. The top end of the upper rod body is rotatably connected to the rod seat, and the bottom end of the lower rod body is rotatably connected to both ends of the lower beam at the bottom of the curtain.

[0020] Further, the upper rod body and the lower rod body have the same length. The upper rod body and the lower rod body are located at both ends in the width direction of the curtain. When the upper rod body and the lower rod body are close to the wall, the rod support is at the highest position on the sliding seat.

[0021] The present invention has the following beneficial effects:

[0022] 1. After the curtain of the present invention is unfolded, the curtain and the support rod synchronously displace towards the wall side so that the support rod is close to the wall, which can greatly improve the stability of the curtain and the viewing effect. At the same time, after the support rod is close to the wall, it cooperates with the lower beam and the shell of the curtain to seal the four axes of the curtain, which can prevent air flow from entering the back side of the curtain and prevent the air flow from disturbing the curtain, further improving the stability of the curtain and the viewing effect.

[0023] 2. The unfolding process and the wall-attaching process of the curtain of the present invention are completed by one-time driving of the motor, and the recovery process of the curtain is also completed by one-time reverse driving of the motor. The structure is simple, the design is ingenious and the operation is convenient. Description of the Drawings

[0024] Figure 1 is a schematic diagram when the curtain of the present invention is fully unfolded;

[0025] Figure 2 is the present invention Figure 1 Enlarged view of part A in;

[0026] Figure 3 is a schematic diagram of the inside of the shell when the curtain of the present invention is fully unfolded;

[0027] Figure 4 is the present invention Figure 3 Enlarged view of part B in;

[0028] Figure 5 is the present invention Figure 3 Enlarged view of part C in;

[0029] Figure 6 is the present invention Figure 3 Partial exploded view in;

[0030] Figure 7 is the present inventionFigure 6 Enlarged view at position D in

[0031] Figure 8 This is the Figure 6 Another perspective view of the present invention;

[0032] Figure 9 This is the Figure 8 Enlarged view at position E in

[0033] Figure 10 Side view of the reel of the present invention;

[0034] Figure 11 Cross-sectional view of the stopper of the present invention. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative work fall within the scope of protection of the present invention.

[0036] Please refer to Figures 1 to 11 As shown, the automatic wall-mounted projector screen of the present invention mainly includes a housing 6, a reel 1, a core shaft 2, a screen 3, an arc-shaped top block 5, a screen channel 7, a stopper 8, a first end plate 9, a second end plate 10, a motor 14, and a support rod 15.

[0037] One side of the housing 6 in contact with the wall is a plane. The housing 6 is installed on the wall, and the side of the housing 6 in contact with the wall touches the wall. The screen channel 7 is provided at the bottom of the housing 6. The screen channel 7 is used for the screen 3 to continuously extend out of the housing 6 and for the screen 3 to move towards the wall in a direction perpendicular to the wall surface.

[0038] The reel 1 is provided in the housing 6 and is mainly used for winding and releasing the screen 3. The core shaft 2 is embedded on the surface of the reel 1, and the core shaft 2 is rotationally matched with the reel 1. The top end of the screen 3 is fixed to the core shaft 2. At this time, after the screen 3 is completely released, the core shaft 2 can rotate relative to the reel 1. When the core shaft 2 is within the lower semi-circle range of the reel 1, the screen 3 can always remain in a vertical state.

[0039] An arc-shaped groove 30 is provided on the surface of the reel 1. The arc-shaped top block 5 is arranged in the arc-shaped groove 30, and the tail end of the arc-shaped top block 5 is rotationally matched with the reel 1. The radian between the tail end of the arc-shaped top block 5 and the core shaft 2 on the circumferential surface of the reel 1 is 180°. When the core shaft 2 is at the bottom end of the reel 1, the tail end of the arc-shaped top block 5 is exactly at the top end of the reel 1.

[0040] Specifically, when the curtain 3 is wound around the reel 1, the arc-shaped top block 5 is pressed by the curtain 3 into the arc-shaped groove 30. After the curtain 3 is completely released and the outer side of the arc-shaped top block 5 is not blocked by the curtain 3, during the process that the reel 1 rotates and the arc-shaped top block 5 passes through the lower semi-circular track of the reel 1 along the rotation direction of the reel 1, under the action of its own gravity, the front end of the arc-shaped top block 5 will automatically flip outward with the tail end as the center until its rear end surface contacts the inner wall surface at the rear end of the arc-shaped groove 30, making the arc-shaped top block 5 in an abducted state.

[0041] The stopper 8 is vertically arranged on the inner top wall of the housing 6 in a liftable manner, and the bottom end of the arc-shaped top block 5 contacts the surface of the curtain 3. When the curtain 3 is unfolded, the stopper 8 continuously descends. Specifically, the stopper 8 includes a block 8.1 with a semi-cylindrical bottom, a guide rod 8.2 whose bottom end is inserted into the block 8.1 and whose top end is fixed on the inner top wall of the housing 6, and a stopper spring 8.3 arranged between the bottom end of the guide rod 8.2 and the block 8.1. At this time, when the template is wound around the reel 1, the bottom of the stopper 8 contacts the surface of the curtain 3, and the stopper spring 8.3 is in a compressed state. Therefore, during the process that the reel 1 rotates to continuously release the curtain 3 and wind the curtain 3, the stopper 8 always contacts the surface of the curtain 3. After the template is completely released, the bottom end of the stopper 8 will contact the surface of the reel 1. At this time, if the abducted arc-shaped top block 5 passes by the stopper 8, the front end of the arc-shaped top block 5 will be blocked by the stopper 8, resulting in the reel 1 being unable to continue rotating around its own axis, and then switching to a swinging process with the front end of the arc-shaped top block 5 as the center.

[0042] Specifically: when the curtain 3 is completely unfolded and the mandrel 2 is located at the bottom of the reel 1, the arc-shaped top block 5 is located at the top of the reel 1. The arc-shaped top block 5 is in an abducted state with its top end outside the reel 1 and its rear end surface abutted against the inner wall surface at the rear end of the arc-shaped groove 30, and the front end of the arc-shaped top block 5 abuts against the stopper 8;

[0043] The first end plate 9 and the second end plate 10 are arranged at both ends inside the housing 6. Arc-shaped rolling grooves 11 are formed on both the first end plate 9 and the second end plate 10 with the front end of the abducted arc-shaped top block 5 as the center. The width of the arc-shaped rolling grooves 11 is set to be adapted to the end diameter of the reel 1, and both ends of the reel 1 are inserted into the arc-shaped rolling grooves 11. The arc-shaped rolling grooves 11 are used to provide space for the reel 1 to swing with the front end of the arc-shaped top block 5 as the center, and to guide and stabilize the swinging center of the reel 1.

[0044] An outer surface of the first end plate 9 is provided with a set of arc-shaped sliding grooves 12 that are concentric with the arc-shaped rolling groove 11. A machine base 13 that is slidably engaged with the arc-shaped sliding grooves 12 is provided outside the first end plate 9. A motor 14 is installed on the machine base 13, and the reel 1 is located at one end of the first end plate 9 and passes through the arc-shaped rolling groove 11 and is connected to an output shaft of the motor 14. Specifically, when a front end of the arc-shaped top block 5 abuts against the stop block 8, driven by the rotation of the motor 14 and in cooperation with the guiding and limiting effects of the machine base 13 and the arc-shaped sliding grooves 12, the machine base 13 will support the overall swing of the motor 14, the reel 1, and the curtain 3, causing the curtain 3 to displace toward the wall side to achieve the purpose of adhering to the wall. During the swinging process of the reel 1, the curtain 3 can always remain in a vertical state and will not be wound around the reel 1 by rotating relative to the reel 1 through the core shaft 2.

[0045] Support rods 15 are provided on both sides of the bottom of the housing 6. The support rods 15 are configured to have a retracted state and an extended state. Specifically, when the support rods 15 are in the retracted state, they are received in the bottom of the housing 6. When the support rods 15 are in the extended state, they are in a state perpendicular to the housing 6. The support rods 15 have a deployment process synchronized with the curtain 3, and when the curtain 3 displaces toward the wall side, the support rods 15 synchronously displace toward the wall side and adhere to the wall.

[0046] In the automatic wall-adhering projector curtain provided in this embodiment, when the curtain 3 displaces toward the wall side, finally the support rods 15 contact the wall, and the support rods 15 close the openings on both sides of the curtain 3 to prevent air flow from entering behind the curtain 3 and disturbing the curtain 3, thereby improving the viewing effect.

[0047] Third end plates 16 and fourth end plates 17 are further provided at both ends of the housing 6 and are respectively located on the sides of the first end plate 9 and the second end plate 10. The third end plates 16 and the fourth end plates 17 close both ends of the housing 6. The motor 14 is slidably arranged between the first end plate 9 and the third end plate 16, and a limiting spring 18 is provided on one side of the motor 14. The limiting spring 18 is used to keep the motor 14 and the reel 1 at the starting end of the arc-shaped rolling groove 11, and the limiting spring 18 is compressed when the reel 1 moves from the starting end to the ending end of the arc-shaped rolling groove 11. The starting end of the arc-shaped groove 30 refers to the initial position of the reel 1 in the arc-shaped groove 30.

[0048] The support rod 15 includes a rod body portion 15.1 and a rod base 15.2. The top end of the rod body portion 15.1 is rotatably connected to the rod base 15.2. The two rod bases 15.2 are slidably arranged on the housing 6 in a direction perpendicular to the wall surface through a sliding seat 19, and the rod bases 15.2 are displaceable in the height direction of their corresponding sliding seats 19. The sliding seat 19 is in an "L" shape. A groove 20 for the displacement of the sliding seat 19 is provided at the bottom of the housing 6, and the bottom of the sliding seat 19 is on the same plane as the bottom of the housing 6.

[0049] On the inner side of the first end plate 9, a fifth end plate 21 is provided. On the inner side of the second end plate 10, a sixth end plate 22 is provided. Through grooves 23 adapted to the arc-shaped rolling grooves 11 are provided on the fifth end plate 21 and the sixth end plate 22 for the end part of the reel 1 to penetrate through. There are slide seat channels 24 for the vertical displacement of the slide seat 19 between the first end plate 9 and the fifth end plate 21 and between the second end plate 10 and the sixth end plate 22.

[0050] At the top of the vertical part of the slide seat 19, an elastic telescopic rod 25 is rotatably connected. On both sides of the top end of the elastic telescopic rod 25, guide blocks 26 are provided. On both side surfaces of the slide seat channel 24, guide grooves 27 adapted to the guide blocks 26 are provided. The guide groove 27 includes a straight section 27.1 and an arc section 27.2. On one side of the two side surfaces of the slide seat channel 24 corresponding to the arc section 27.2 of the guide groove 27, a fulcrum post 28 is provided. On the surface of the elastic telescopic rod 25, there is a "U"-shaped sleeve block 29 that sleeves on the fulcrum post 28 when the guide block 26 moves to the arc section 27.2, and the center of the arc of the arc section 27.2 is the center of the fulcrum post 28.

[0051] Specifically, when the reel 1 swings with the front end of the arc-shaped top block 5 in an abducted state as the center of the circle, the reel 1 first pushes the elastic telescopic rod 25 to drive the slide seat 19 to displace towards the wall side. The elastic telescopic rod 25 first displaces through the guide block 26 in the straight section 27.1 in a linear motion process. When the guide block 26 enters the top of the arc section 27.2, the fulcrum post 28 enters the sleeve block 29. In the subsequent swinging process of the reel 1, the elastic telescopic rod 25 swings with the fulcrum post 28 as the center in a process where the bottom end swings towards the wall side. During the swinging process of the elastic telescopic rod 25, the elastic telescopic rod 25 will stretch, and the slide seat 19 continues to displace towards the wall side, so that the support rod 15 finally adheres to the wall. During the process of the elastic telescopic rod 25 swinging with the fulcrum post 28 as the center, the guide block 26 moves from the top end to the bottom end of the arc section 27.2.

[0052] Among them, when the reel 1 is at the starting end of the arc-shaped rolling groove 11, the ejection telescopic rod is in a vertical state and contacts the reel 1, and the part of the elastic telescopic rod 25 below the bottom of the reel 1 extends along the circumferential surface of the reel 1 towards the reel 1 side and forms an arc-shaped groove 30 with a 90° radian. By using the arc-shaped groove 30, during the process of the guide block 26 displacing in the straight section 27.1, the limiting effect between the guide block 26 and the straight section 27.1, the limiting effect between the slide seat 19 and the housing 6, and the limiting effect between the arc-shaped groove 30 and the reel 1 can all ensure that the elastic telescopic rod 25 together with the slide seat 19 can perform a translational motion perpendicular to the wall. And the limiting spring 18 can be arranged between the elastic telescopic rod 25 and the housing 6.

[0053] Furthermore, the support rod 15 includes an upper rod body and a lower rod body which are vertically distributed and rotatably engaged. The top end of the upper rod body is rotatably connected to the rod seat 15.2, and the bottom end of the lower rod body is rotatably connected to both ends of the lower beam 31 at the bottom of the curtain 3. Specifically, when the curtain 3 is in a state of being wound around the reel 1, the upper rod body and the lower rod body are in a folded state, so that the support rod 15 is in an overall retracted state. At this time, after the upper rod body and the lower rod body are folded, they are located at the bottom of the housing 6. During the unfolding process of the curtain 3, the upper rod body and the lower rod body are continuously unfolded until the curtain 3 is completely unfolded, and the upper rod body and the lower rod body are located on a straight line in the vertical direction.

[0054] Even further, the upper rod body and the lower rod body have the same length, so that the lengths of the upper rod body and the lower rod body can be set to half of the width of the curtain 3. The upper rod body and the lower rod body are located at both ends in the width direction of the curtain 3, and when the upper rod body and the lower rod body are close to the wall, the rod support is at the highest position on the sliding seat 19.

[0055] Specifically, after the curtain 3 is completely unfolded, the two support rods 15 are located at both ends of the curtain 3 in the width direction of the curtain 3. The support rods 15 cooperate with the lower beam 31 at the bottom of the curtain 3 to keep the curtain 3 in a relatively stable state without random shaking. During the process of the curtain 3 displacing towards the wall side, since the reel 1 rotates, the curtain 3 will be lifted upwards. At this time, the support rod 15 remains in a vertical state under the action of its own gravity.

[0056] The above embodiments of the present invention are further introduced as follows:

[0057] (1) In the initial state, the curtain 3 is wound around the reel 1, the arc-shaped top block 5 is located in the arc-shaped groove 30 and is blocked by the curtain 3. The curtain 3 is located at the end far from the wall in the direction perpendicular to the wall of the curtain channel 7. The support rod 15 is in an overall state of being retracted at the bottom of the housing 6. The limit spring 18 keeps the overall positions of the motor 14, the reel 1, the curtain 3, etc., and the guide block 26 is located at the end far from the wall of the straight section 27.1.

[0058] (2) During the process of the motor 14 starting to drive the curtain 3 to extend and unfold from the housing 6:

[0059] The curtain 3 continuously extends out of the housing 6 and unfolds downwards. The support rod 15 swings downwards with the top end of the upper rod body as the center, and the upper rod body and the lower rod body are continuously unfolded.

[0060] (3) The curtain 3 is completely unfolded:

[0061] First, the core rod is located at the bottom position of the reel 1, and the curtain 3 is in a vertical state;

[0062] Second, the support rod 15 is in a vertical state, and the rod seat 15.2 is at the lowest position on the sliding seat 19;

[0063] Thirdly, the outer end of the arc-shaped top block 5 is in an outwardly extending state, and the outer end of the arc-shaped top block 5 contacts the stop block 8.

[0064] (4) The curtain 3 is displaced towards the wall side:

[0065] Firstly, the power for this process comes from the motor 14. When the motor 14 operates, it drives the scroll 1 to rotate. The scroll 1 drives the arc-shaped top block 5 to rotate. At this time, since the arc-shaped top block 5 is blocked by the stop block 8, the scroll 1 swings towards the wall side with the front end of the arc-shaped top block 5, that is, the end where the arc-shaped top block 5 contacts the stop block 8 as the center of the circle. At the same time, through the movement of the machine base 13 in the arc-shaped chute 12, the motor 14 and the scroll 1 move synchronously as a whole, and the limit spring 18 is compressed;

[0066] Secondly, during the swinging process of the scroll 1, the movement process of the curtain 3 is a composite process of approaching the wall side and upward displacement. During the upward displacement process of the curtain 3, the support rod 15 follows the curtain 3 and has a synchronous upward displacement process, and the support rod 15 finally contacts the wall surface;

[0067] Thirdly, during the swinging process of the scroll 1, the elastic telescopic rod 25 is first pushed towards the wall side. When the guide block 26 enters the arc section 27.2 from the straight section 27.1 of the guide groove 27, since the fulcrum column 28 enters the sleeve block 29, the elastic telescopic rod 25 makes a swinging process with the fulcrum column 28 as the center of the circle. During this process, the elastic telescopic rod 25 is stretched.

[0068] (5) During the process of storing the curtain 3:

[0069] In the initial stage of the reverse rotation of the motor 14, the scroll 1 swings reversely to the starting end of the arc-shaped rolling groove 11, and then continuously stores the curtain 3 during the reverse rotation process. The outwardly extending arc-shaped top block 5 is received into the arc-shaped groove 30 under the action of the curtain 3. At the same time, after the two ends of the support rod 15 receive the clamping force, they will start to fold and continuously be received towards the bottom of the housing 6.

[0070] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0071] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic wall-mounted projector screen, characterized in that, Comprising: A reel, on the surface of which a rotatable mandrel is embedded. The top end of the curtain is fixed on the mandrel, and the curtain is wound around the reel. An arc-shaped groove is formed on the surface of the reel, and an arc-shaped top block with its tail end rotatably engaged with the reel is arranged in the arc-shaped groove. The radian between the tail end of the arc-shaped top block and the mandrel is 180°; A housing, the reel is located inside the housing, and a curtain channel is arranged at the bottom of the housing for the bottom end of the curtain to extend out and for the curtain to displace towards the wall surface; A stop block, which is vertically arranged on the inner top wall of the housing in a liftable manner. The bottom end of the stop block contacts the surface of the curtain. When the curtain is unfolded, the stop block continuously descends; when the curtain is fully unfolded and the mandrel is located at the bottom of the reel, the arc-shaped top block is located at the top of the reel. The arc-shaped top block is in an outward-expanded state with its top end outside the reel and its tail end surface abutted against the inner wall surface of the tail end of the arc-shaped groove, and the front end of the arc-shaped top block abuts against the stop block; wherein: At both ends inside the housing, a first end plate and a second end plate are respectively arranged. Arc-shaped rolling grooves with the front end of the arc-shaped top block in the outward-expanded state as the center of the circle are formed on both the first end plate and the second end plate. The width of the arc-shaped rolling groove is set to be adapted to the end diameter of the reel, and both ends of the reel are inserted into the arc-shaped rolling grooves; A set of arc-shaped sliding grooves concentric with the arc-shaped rolling groove are arranged on the outer surface of the first end plate. A machine base slidably matched with the arc-shaped sliding grooves is arranged outside the first end plate. The motor is installed on the machine base, and one end of the reel located on the first end plate penetrates through the arc-shaped rolling groove and is connected to the output shaft of the motor; Support rods are arranged on both sides of the bottom of the housing. The support rods are set to have a retracted state and an unfolded state, and the support rods have an unfolding process synchronized with the curtain. When the curtain displaces towards the wall side, the support rods displace towards the wall side synchronously and are attached to the wall.

2. The automatic wall-mounted projector screen according to claim 1, wherein The stop block includes a block body with a semi-cylindrical bottom, a guide rod with its bottom end inserted into the block body and its top end fixed on the inner top wall of the housing, and a stop block spring arranged between the bottom end of the guide rod and the block body.

3. The automatic wall-mounted projector screen according to claim 2, wherein Third end plates and fourth end plates are further arranged at both ends of the housing and are respectively located on the sides of the first end plate and the second end plate. The third end plate and the fourth end plate enclose both ends of the housing. The motor is slidably arranged between the first end plate and the third end plate, and a limit spring is arranged on one side of the motor. The limit spring is used to keep the motor and the reel at the starting end of the arc-shaped rolling groove, and the limit spring is compressed when the reel moves from the starting end to the ending end of the arc-shaped rolling groove.

4. The automatic wall-mounted projector screen according to claim 3, characterized in that, The support rod includes a rod body part and a rod seat. The top end of the rod body part is rotatably connected to the rod seat. The two rod seats are slidably arranged on the housing in the direction perpendicular to the wall surface through sliding seats, and the rod seats can displace in the height direction of their corresponding sliding seats.

5. An automatic wall-mounted projector screen according to claim 4, characterized in that, The sliding seat is in an "L" shape. A groove for the displacement of the sliding seat is arranged at the bottom of the housing, and the bottom of the sliding seat is on the same plane as the bottom of the housing.

6. The automatic wall-mounted projector screen according to claim 5, wherein A fifth end plate is arranged in the inner side direction of the first end plate, and a sixth end plate is arranged in the inner side direction of the second end plate. Through grooves adapted to the arc-shaped rolling grooves are arranged on the fifth end plate and the sixth end plate for the end part of the reel to penetrate through. There are sliding seat channels for the vertical part of the sliding seat to displace between the first end plate and the fifth end plate and between the second end plate and the sixth end plate.

7. The automatic wall-mounted projector screen according to claim 6, wherein, The top of the vertical part of the sliding seat is rotatably connected with an elastic telescopic rod. On both sides of the top end of the elastic telescopic rod, there are guide blocks. On both side surfaces of the sliding seat channel, there are guide grooves adapted to the guide blocks. The guide grooves include a straight section and an arc section. On one side of the sliding seat channel corresponding to the arc section of the guide groove, there are fulcrum columns. On the surface of the elastic telescopic rod, there is a "U"-shaped sleeve block that sleeves on the fulcrum column when the guide block moves to the arc section, and the center of the arc of the arc section is the center of the fulcrum column.

8. An automatic wall-mounted projector screen according to claim 7, characterized in that, When the reel is at the starting end of the arc-shaped rolling groove, the ejection telescopic rod is in a vertical state and contacts the reel, and the part of the elastic telescopic rod below the bottom of the reel extends along the circumferential surface of the reel towards one side of the reel and forms an arc-shaped groove with an angle of °.

9. The automatic wall-mounted projector screen according to claim 4, wherein, The support rod includes an upper rod body and a lower rod body that are distributed up and down and are rotationally matched. The top end of the upper rod body is rotatably connected to the rod seat, and the bottom end of the lower rod body is rotatably connected to both ends of the lower beam at the bottom of the curtain.

10. The automatic wall-mounted projector screen according to claim 9, characterized in that, The upper rod body and the lower rod body have the same length. The upper rod body and the lower rod body are located at both ends in the width direction of the curtain. When the upper rod body and the lower rod body are close to the wall, the rod seat is at the highest position on the sliding seat.

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