Projection screen with winch

Abstract

The utility model relates to the field of projection screens, in particular to a projection screen with a winch, which comprises a rotating pipe, a rotating pipe sleeve, a winch wheel, a winch rope, a screen upper rod, a curtain, a screen lower rod and a driving motor used for driving the rotating pipe to rotate. The rotating pipe sleeve is provided with a groove which can accommodate the screen upper rod in the length direction. The outer diameter of the winding wheel is sleeved with a winding wheel sleeve capable of rotating in the axial direction, and the winding wheel sleeve is provided with a winding cable outlet in the length direction of the rotating pipe; a convex groove for increasing the thickness of the outer side of the winding wheel sleeve is formed in the edge of the winding cable outlet in the length direction, one end of the winding cable is connected with the rotating pipe and wound on the winding wheel, and the other end of the winding cable penetrates out of the winding cable outlet of the winding wheel sleeve and then is connected with the screen upper rod; one end of the curtain is connected with the screen upper rod, the other end of the curtain is connected with the screen lower rod, and the convex groove for increasing the thickness of the outer side of the winding wheel sleeve is arranged at the outlet of the winding cable, so that the effect of preventing the winding wheel sleeve from rotating along with the winding wheel can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of projection screen, more particularly to a projection screen with a winch. BACKGROUND

[0002] The projection screen has been gradually expanded from the previous household, small conference site and cinema to large banquet hall and exhibition center, and therefore, the projection screen has been widely applied at present.

[0003] At present, the projection screen used in large banquet hall, exhibition and other high ceiling sites is a screen with a self-winch device. The screen is mostly rotated by driving the motor to drive the rotating pipe. When the projection screen is used up and needs to be wound up, the winch wheels on both sides of the rotating pipe will first wind up the winch rope. When the winch rope is wound up, the curtain is wound on the rotating pipe sleeve of the rotating pipe. When the projection screen needs to be used, it only needs to be operated in reverse to achieve the lowering of the projection screen.

[0004] However, in actual application, it is found that since the winch rope is arranged in the winch wheel, when the bottom of the winch rope is not connected with the curtain and other devices, i.e. the bottom of the winch rope is not under load, or the screen upper rod on one side is loosened during use, or even if the curtain is lifted by people during use, since the bottom of the winch rope is not under load, the winch rope wound on the winch wheel will be instantaneously scattered. At this time, the staff can only straighten the winch rope slowly, and then the projection screen can be used again, which greatly wastes the time of the staff.

[0005] In order to solve this problem, a winch wheel sleeve is arranged on the winch wheel to limit the scattering of the winch rope. However, the winch wheel sleeve is connected with other components around the projection screen during setting. Therefore, the curtain cannot be wound on the outer circle of the winch wheel sleeve. When the curtain needs to be wound on the winch wheel sleeve, the winch wheel sleeve must be set to be not connected with the projection screen. However, when the winch wheel rotates to wind the winch rope, the winch wheel sleeve is easily rotated with the rotation of the winch wheel, which causes the winch rope to be wound on the outer circle of the winch wheel sleeve.

[0006] Therefore, it is necessary to provide a projection screen with a winch to solve the above problems. UTILITY MODEL CONTENT

[0007] The utility model provides a projection screen with a winch to overcome at least one defect (shortcoming) of the prior art.

[0008] The utility model discloses a kind of self-provided hoist projection screen, including rotating pipe, rotating pipe sleeve, hoist wheel, hoist cable, screen upper rod, curtain, screen lower rod and the drive motor for driving rotating pipe rotation;

[0009] The rotating pipe sleeve and the hoist wheel are arranged on the rotating pipe, and the rotating pipe sleeve is provided with a groove in the length direction, which can accommodate the screen upper rod.

[0010] The hoist wheel sleeve is rotatable in the axial direction, and the hoist wheel sleeve is provided with a hoist cable outlet in the length direction of the rotating pipe.

[0011] The edge of the hoist cable outlet in the length direction is provided with a convex groove that increases the thickness of the outer side of the hoist wheel sleeve. One end of the hoist cable is connected to the rotating pipe and is wound around the hoist wheel, and the other end is connected to the screen upper rod after passing through the hoist cable outlet of the hoist wheel sleeve.

[0012] One end of the curtain is connected to the screen upper rod, and the other end is connected to the screen lower rod. The rotating pipe is driven by the drive motor to rotate, so the hoist wheel arranged on the rotating pipe can first wind the hoist cable. When the hoist cable is fully wound, the curtain is then wound on the rotating pipe sleeve. Compared with the prior art, the hoist wheel sleeve is provided on the hoist wheel. When the bottom of the hoist cable is not hoisted with a curtain or the hoisted curtain is lifted, the hoist wheel sleeve can limit the hoist cable, so that the hoist cable does not fully spread on the hoist wheel. In addition, since the outer circle of the hoist wheel sleeve is not connected to the periphery of the projection screen, the rotating pipe sleeve will not hinder the winding of the curtain. The convex groove that increases the thickness of the outer side of the hoist wheel sleeve is provided at the hoist cable outlet. After the hoist cable under load contacts the convex groove, the winding diameter of the hoist cable is increased, which prevents the hoist wheel sleeve from rotating with the hoist wheel, so that the hoist cable does not wind around the outer circle of the hoist wheel sleeve.

[0013] Further, the convex groove is a roller shaft with a length equivalent to the hoist cable outlet. The two ends of the roller shaft are connected to the fixed parts at the two ends of the length direction of the hoist cable outlet. Since one roller shaft with a length equivalent to the hoist cable outlet is provided on each side of the hoist cable outlet, the roller shaft can guide the winding and unwinding of the hoist cable. After the hoist cable under load contacts the roller shaft, the winding diameter is increased, which prevents the hoist wheel sleeve from rotating with the hoist wheel, so that the hoist cable does not wind around the outer circle of the hoist wheel sleeve.

[0014] Further, the hoist wheel sleeve includes two first hoist wheel sleeve pressing blocks and second hoist wheel sleeve pressing blocks, each in the shape of a semicircle.

[0015] The first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block each comprise a winding wheel sleeve pressing block body, a positioning installation upper block, a positioning installation lower block, and a pressing positioning edge with a locking hole;

[0016] The positioning installation upper block and the positioning installation lower block are respectively arranged on both sides of the top of the winding wheel sleeve pressing block body;

[0017] The pressing positioning edge is arranged at the bottom of the winding wheel sleeve pressing block body;

[0018] When the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are locked with each other, the pressing positioning edges of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are locked with each other, the positioning installation upper block of the first winding wheel sleeve pressing block is locked on the positioning installation lower block of the second winding wheel sleeve pressing block, the positioning installation lower block of the first winding wheel sleeve pressing block is locked on the positioning installation upper block of the second winding wheel sleeve pressing block, and the roller shaft is detachably arranged on the positioning installation upper block of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block. By fixing the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block on the outside of the winding wheel after being locked with each other, when the bottom of the winding rope is not under load or the curtain at the bottom of the winding rope is lifted by a person, the winding rope on the winding wheel is limited by the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block, so that the winding rope on the winding wheel is not scattered. When the first winding wheel sleeve pressing block needs to be locked on the second winding wheel sleeve pressing block, only the locking holes on the pressing positioning edges at the bottom of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block need to be locked by screws. The positioning installation upper block and the positioning installation lower block on the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are also locked by screws. In this way, the fixing and locking of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are quickly realized. In addition, in actual application, the convex groove and the winding wheel can be arranged in an integrated structure, which is equivalent to increasing the wall thickness of the winding wheel. In this way, the winding rope can also increase the winding diameter, which prevents the winding wheel sleeve from rotating with the winding wheel and causes the winding rope to be wound on the outer circle of the winding wheel sleeve.

[0019] Further, the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are mutually symmetrical. Since the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are mutually symmetrical, the production of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block is facilitated.

[0020] Furthermore, the winding wheel sleeve pressing block body is provided with a connecting reinforcing rib at the winding rope outlet. The connecting reinforcing rib and the winding wheel sleeve pressing block body are in an integrated structure. By arranging the connecting reinforcing rib, the connection strength at the winding rope outlet can be effectively increased.

[0021] Further, the bottom of the hoisting rope is provided with a hoisting rope fixing component;

[0022] The hoisting rope fixing component is provided with a fastening screw hole and a fastening screw, and when the hoisting rope passes through the hoisting rope fixing component, the fastening screw is pressed against the hoisting rope after passing through the fastening screw hole;

[0023] The top of the screen upper rod is provided with an open slot in the length direction, which can accommodate rotation and sliding of the hoisting rope fixing component, and the open slot is provided with a communication port for adjusting the fastening screw on the hoisting rope fixing component. By providing the hoisting rope fixing component at the bottom of the hoisting rope and providing the open slot in the length direction at the top of the screen upper rod, which can accommodate rotation and sliding of the hoisting rope fixing component, during installation, only the bottom of the hoisting rope needs to be fixed by the hoisting rope fixing component, and then the hoisting rope fixing component is placed in the open slot and slid to a position perpendicular to the hoisting rope to lock, thus completing the installation. When disassembling, only the fastening screw needs to be disassembled by using a screwdriver through the communication port, thus quickly separating the screen upper rod from the hoisting rope, which is simple and convenient.

[0024] Further, one or more of the pipe sleeves are arranged between adjacent hoisting wheels. In actual application, the number of hoisting wheels can be two, and the two hoisting wheels are arranged on the left and right sides of the pipe. One or more pipe sleeves can be arranged on the pipe between the two hoisting wheels as needed. When the hoisting wheels collect the hoisting rope, the screen upper rod, the curtain, and the screen lower rod are wound in the pipe sleeve between the two hoisting wheel sleeves, thus realizing the folding of the curtain. In addition, when the length of the curtain is relatively long, one or more hoisting wheels can be additionally arranged at the middle position of the pipe in addition to the hoisting wheels arranged on the left and right sides of the pipe. Such arrangement can effectively prevent the middle part of the curtain from sagging and causing unevenness of the curtain.

[0025] Further, one or more of the pipe sleeves are arranged between adjacent hoisting wheels. In actual application, the number of hoisting wheels can be two, and the two hoisting wheels are arranged on the left and right sides of the pipe. One or more pipe sleeves can be arranged on the pipe between the two hoisting wheels as needed. When the hoisting wheels collect the hoisting rope, the screen upper rod, the curtain, and the screen lower rod are wound in the pipe sleeve between the two hoisting wheel sleeves, thus realizing the folding of the curtain. In addition, when the length of the curtain is relatively long, one or more hoisting wheels can be additionally arranged at the middle position of the pipe in addition to the hoisting wheels arranged on the left and right sides of the pipe. Such arrangement can effectively prevent the middle part of the curtain from sagging and causing unevenness of the curtain.

[0026] Further, the screen upper rod is also provided with an auxiliary curtain, which can reduce the indentation of the curtain caused by the gap between the screen upper rod and the pipe sleeve after the screen upper rod is embedded in the pipe sleeve, and can protect the curtain.

[0027] Further, it also includes a projection screen protection shell and a pipe rotating shaft;

[0028] The two sides of the rotating pipe are rotatably arranged in the projection screen protection shell through rotating pipe rotating shafts;

[0029] The bottom of the projection screen protection shell is provided with a gap for the hoisting rope, the screen upper rod, the curtain and the screen lower rod to pass through, through the arrangement of the projection screen protection shell, the curtain can be protected from dust, and the rotating pipe can be rotatably arranged in the projection screen protection shell through the driving of the driving motor after installation, so that the hoisting rope and the curtain are wound and lowered, which is simple and convenient.

[0030] Compared with the prior art, the beneficial effects of the technical scheme of the utility model are:

[0031] The self-provided hoisting projection screen disclosed by the utility model drives the rotating pipe to rotate through the driving motor, so that the hoisting wheel arranged on the rotating pipe can first wind the hoisting rope, and the curtain is wound on the rotating pipe sleeve after the hoisting rope is wound, compared with the prior art, the hoisting wheel sleeve can limit the hoisting rope when the bottom of the hoisting rope is not hung with the curtain or the hung curtain is lifted, so that the hoisting rope cannot be completely scattered on the hoisting wheel, in addition, since the outer circle of the hoisting wheel sleeve is not connected with the periphery of the projection screen, the rotating pipe sleeve cannot hinder the winding of the curtain, and the convex groove with the increased thickness of the outer side of the hoisting wheel sleeve is arranged at the outlet of the hoisting rope, after the hoisting rope under the load contacts the convex groove, the winding diameter of the hoisting rope is increased, the hoisting wheel sleeve is prevented from rotating with the hoisting wheel, and the hoisting rope cannot be wound on the outer circle of the hoisting wheel sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a structure schematic view of the self-provided hoisting projection screen in the utility model.

[0033] Figure 2 It is a structure schematic view of the self-provided hoisting projection screen in the utility model after the projection screen protection shell is disassembled.

[0034] Figure 3 It is a structure schematic view of the self-provided hoisting projection screen in the utility model from another angle after the projection screen protection shell is disassembled.

[0035] Figure 4 It is a structure schematic view of the hoisting wheel, the hoisting wheel sleeve and the hoisting rope arranged on the two sides of the rotating pipe in the utility model.

[0036] Figure 5 It is a structure schematic view of the hoisting wheel and the hoisting rope arranged on the two sides of the rotating pipe after the hoisting wheel sleeve is disassembled in the utility model.

[0037] Figure 6It is the structural schematic view of the rotating pipe sleeve setting on the rotating pipe in the utility model.

[0038] Figure 7 It is the structural enlarged view of the winch sleeve setting on the winch in the utility model.

[0039] Figure 8 It is the structural schematic view of the winch sleeve in the utility model.

[0040] Figure 9 It is the structural schematic view of the winch sleeve from another angle in the utility model.

[0041] Figure 10 It is the structural schematic view of the first winch sleeve pressing block or the second winch sleeve pressing block in the utility model.

[0042] Figure 11 It is the structural schematic view of the winch rope setting in the opening slot of the screen upper rod through the winch rope fixing component in the utility model.

[0043] In the drawing, 1 is rotating pipe, 2 is rotating pipe sleeve, 3 is winch, 4 is winch rope, 5 is screen upper rod, 6 is curtain, 7 is screen lower rod, 8 is driving motor, 9 is winch sleeve, 10 is winch rope outlet, 11 is first winch sleeve pressing block, 12 is second winch sleeve pressing block, 13 is convex slot, 14 is winch sleeve pressing block body, 15 is positioning installation upper block, 16 is positioning installation lower block, 17 is locking hole, 18 is pressing positioning edge, 19 is connecting reinforcing rib, 20 is recess, 21 is auxiliary curtain, 22 is projection screen protection shell, 23 is rotating pipe rotating shaft, 24 is gap, 25 is winch rope fixing component, 26 is fastening screw hole, 27 is fastening screw, 28 is opening slot, 29 is communication port. DETAILED DESCRIPTION

[0044] The drawing is only for example description, and should not be understood as the limitation of the patent; in order to better illustrate the embodiment, some components of the drawing can be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures in the drawing and their description can be omitted.

[0045] In the description of the utility model, it should be pointed out that, unless otherwise explicitly specified and limited, the terms "installation", "connection" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through intermediate medium, and can be said to be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. The technical scheme of the utility model is further illustrated below in combination with the drawing and embodiment.

[0046] As Figures 1-6 shown, a self-take-up projection screen comprises a rotating tube 1, a rotating tube sleeve 2, a take-up wheel 3, a take-up cable 4, a screen upper rod 5, a screen cloth 6, a screen lower rod 7 and a driving motor 8 for driving the rotating tube 1 to rotate; the rotating tube sleeve 2 and the take-up wheel 3 are both arranged on the rotating tube 1, the rotating tube sleeve 2 is provided with a length direction groove 20 capable of accommodating the screen upper rod 5; the take-up wheel 3 is provided with a take-up wheel sleeve 9 capable of rotating in the axial direction, the take-up wheel sleeve 9 is provided with a take-up cable outlet 10 in the length direction of the rotating tube 1; the edge of the take-up cable outlet 10 in the length direction is provided with a convex groove 13 for increasing the thickness of the outer side of the take-up wheel sleeve 9, one end of the take-up cable 4 is connected to the rotating tube 1 and is wound around the take-up wheel 3, the other end is connected to the screen upper rod 5 after being pulled out of the take-up cable outlet 10 of the take-up wheel sleeve 9; one end of the screen cloth 6 is connected to the screen upper rod 5, the other end is connected to the screen lower rod 7, the rotating tube 1 is driven to rotate by the driving motor 8, thus the take-up wheel 3 arranged on the rotating tube 1 can first wind up the take-up cable 4, when the take-up cable 4 is wound up completely, the screen cloth 6 is wound up on the rotating tube sleeve 2, compared with the prior art, the take-up wheel sleeve 9 is arranged on the take-up wheel 3, when the bottom of the take-up cable 4 is not hoisted with the screen cloth 6 or the hoisted screen cloth 6 is lifted up, the take-up wheel sleeve 9 can limit the take-up cable 4, thus the take-up cable 4 will not be completely unwound on the take-up wheel 3, in addition, since the outer circle of the take-up wheel sleeve 9 is not connected to the periphery of the projection screen, the rotating tube sleeve 2 will not be hindered from winding the screen cloth 6, the convex groove 13 for increasing the thickness of the outer side of the take-up wheel sleeve 9 is arranged at the take-up cable outlet 10, after the take-up cable 4 under load contacts the convex groove 13, the winding diameter of the take-up cable 4 is increased, the take-up wheel sleeve 9 is prevented from rotating with the take-up wheel 3, thus the take-up cable 4 will not be wound on the outer circle of the take-up wheel sleeve 9.

[0047] As Figures 7-11As shown, the convex groove 13 is a roller shaft with a length corresponding to the length of the hoisting rope outlet 10, and the two ends of the roller shaft are connected to the fixed parts at the two ends of the length direction of the hoisting rope outlet 10. Since one roller shaft with a length corresponding to the length of the hoisting rope outlet 10 is arranged on each side of the hoisting rope outlet 10, the arrangement of the roller shaft can guide the winding and unwinding of the hoisting rope 4, and after the hoisting rope 4 in the heavy state contacts the roller shaft, the winding diameter is increased, which prevents the winding wheel cover 9 from rotating with the winding wheel 3, so that the hoisting rope 4 cannot be wound on the outer circle of the winding wheel cover 9. In the utility model, the winding wheel cover 9 comprises two first winding wheel cover pressing blocks 11 and second winding wheel cover pressing blocks 12, which are both semicircular; the first winding wheel cover pressing block 11 and the second winding wheel cover pressing block 12 both comprise a winding wheel cover pressing block body 14, a positioning and mounting upper block 15, a positioning and mounting lower block 16, and a pressing and positioning edge 18 with a locking hole 17; the positioning and mounting upper block 15 and the positioning and mounting lower block 16 are respectively arranged on the two sides of the top of the winding wheel cover pressing block body 14; and the pressing and positioning edge 18 is arranged at the bottom of the winding wheel cover pressing block body 14.When the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12 are locked with each other, the pressing positioning edges 18 of the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12 are locked with each other, the positioning installation upper block 15 of the first winding wheel sleeve pressing block 11 is locked on the positioning installation lower block 16 of the second winding wheel sleeve pressing block 12, the positioning installation lower block 16 of the first winding wheel sleeve pressing block 11 is locked on the positioning installation upper block 15 of the second winding wheel sleeve pressing block 12, the roller is detachably arranged on the positioning installation upper block 15 of the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12, and the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12 are fixed outside the winding wheel 3 after being locked with each other. Therefore, when the bottom of the winding rope 4 is not under load or the curtain 6 at the bottom of the winding rope 4 is lifted by a person, the winding rope 4 on the winding wheel 3 will be limited by the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12, so that the winding rope 4 on the winding wheel 3 will not be scattered. When it is necessary to lock the first winding wheel sleeve pressing block 11 on the second winding wheel sleeve pressing block 12, only the locking holes 17 on the pressing positioning edges 18 at the bottom of the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12 need to be locked by screws, and the positioning installation upper block 15 and the positioning installation lower block 16 on the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12 are also locked by screws. In this way, the fixing and locking of the first winding wheel sleeve pressing block 11 and the second winding wheel sleeve pressing block 12 can be quickly realized. In addition, in actual application, the convex groove 13 and the winding wheel 3 can be arranged in an integrated structure, which is equivalent to increasing the wall thickness of the winding wheel 3. In this way, the winding rope 4 can also increase the winding diameter, which can prevent the winding wheel sleeve 9 from rotating with the winding wheel 3, so that the winding rope 4 will not be wound on the outer circle of the winding wheel sleeve 9.

[0048] In the utility model, the first hoisting wheel sleeve pressing block 11 and the second hoisting wheel sleeve pressing block 12 are mutually symmetrical, so that the production of the first hoisting wheel sleeve pressing block 11 and the second hoisting wheel sleeve pressing block 12 is facilitated, in addition, the connecting reinforcing rib 19 is arranged at the hoisting rope outlet 10 of the hoisting wheel sleeve pressing block body 14, the connecting reinforcing rib 19 and the hoisting wheel sleeve pressing block body 14 are of an integral structure, the connecting reinforcing rib 19 can effectively enhance the connecting strength at the hoisting rope outlet 10, in addition, the hoisting rope fixing part 25 is arranged at the bottom of the hoisting rope 4, the fastening screw hole 26 and the fastening screw 27 are arranged on the hoisting rope fixing part 25, when the hoisting rope 4 passes through the hoisting rope fixing part 25, the fastening screw 27 passes through the fastening screw hole 26 and is pressed with the hoisting rope 4, the top of the screen upper rod 5 is provided with an open slot 28 capable of rotating and sliding the hoisting rope fixing part 25 in the length direction, the open slot 28 is provided with the communication port 29 for adjusting the fastening screw 27 on the hoisting rope fixing part 25, the hoisting rope fixing part 25 is arranged at the bottom of the hoisting rope 4, and the open slot 28 capable of rotating and sliding the hoisting rope fixing part 25 in the length direction is arranged at the top of the screen upper rod 5, so that when installing, only the bottom of the hoisting rope 4 needs to be fixed through the hoisting rope fixing part 25, then the hoisting rope fixing part 25 is put into the open slot 28, and the hoisting rope fixing part 25 is slid to the position perpendicular to the hoisting rope 4 and locked, so that the installation can be completed, when disassembling, only the fastening screw 27 needs to be disassembled through the screwdriver and the communication port 29, so that the screen upper rod 5 and the hoisting rope 4 can be quickly separated, and the operation is simple and convenient.

[0049] In the utility model, one or more rotating pipe sleeves 2 are arranged between adjacent hoisting wheels 3, in actual application, the number of hoisting wheels 3 can be two, two hoisting wheels 3 are arranged at the left and right sides of the rotating pipe 1, and one or more rotating pipe sleeves 2 can be arranged on the rotating pipe 1 between the two hoisting wheels 3 as required, at this time, after the hoisting cable 4 is collected by the hoisting wheel 3, the screen upper rod 5, the curtain 6 and the screen lower rod 7 are wound in the rotating pipe sleeve 2 between the two hoisting wheel sleeves 9, the curtain 6 is retracted, in addition, when the length of the curtain 6 is relatively long, in addition to arranging the hoisting wheel 3 at the left and right sides of the rotating pipe 1, one or more hoisting wheels 3 can also be additionally arranged at the middle position of the rotating pipe 1, the arrangement can effectively prevent the middle part of the curtain 6 from falling and causing the uneven phenomenon of the curtain 6, in some embodiments, one or more hoisting wheels 3 are arranged between adjacent rotating pipe sleeves 2, in actual application, in order to be beautiful, one rotating pipe sleeve 2 is arranged at the left and right sides of the rotating pipe 1 respectively, then one or more rotating pipe sleeves 2 are arranged at the middle part of the rotating pipe 1, and the hoisting wheel 3 is arranged between adjacent rotating pipe sleeves 2, which also belongs to one of the changes of the utility model, and all falls within the protection scope of the utility model.

[0050] In the utility model, the auxiliary curtain 21 is also arranged on the screen upper rod 5, the auxiliary curtain 21 can reduce the indentation caused by the gap of the screen upper rod 5 embedded in the rotating pipe sleeve 2 to the curtain 6, and can protect the curtain 6, in addition, the projection screen protection shell 22 and the rotating pipe rotating shaft 23 are also included; the left and right sides of the rotating pipe 1 are rotatably arranged in the projection screen protection shell 22 through the rotating pipe rotating shaft 23; the bottom of the projection screen protection shell 22 is provided with a gap 24 for the hoisting cable 4, the screen upper rod 5, the curtain 6 and the screen lower rod 7 to pass through, through the arrangement of the projection screen protection shell 22, the curtain 6 can be protected from dust, and the rotating pipe rotating shaft 23 is arranged, after installation, the rotating pipe 1 can be rotatably arranged in the projection screen protection shell 22 by driving the driving motor 8, so that the hoisting cable and the curtain 6 can be wound and lowered, which is simple and convenient.

[0051] Embodiment one

[0052] In the embodiment, the number of hoisting wheels is two, two hoisting wheels are arranged at the left and right sides of the rotating pipe, and one or more rotating pipe sleeves are arranged on the rotating pipe between the two hoisting wheels.

[0053] When the drive motor drives the rotating tube to rotate forward to lower the curtain, the curtain is lowered first. When the curtain is lowered to the designated position, the hoisting ropes on the left and right sides of the screen rod are gradually lowered in the hoisting wheels. When the bottom of the hoisting ropes is not hoisted with the curtain, or the hoisted curtain is lifted, the hoisting wheel sleeve can limit the hoisting ropes, so that the hoisting ropes will not be completely scattered on the hoisting wheels.

[0054] When the curtain is used up and needs to be retracted, the drive motor drives the rotating tube to rotate in the opposite direction, and the hoisting ropes are wound in the hoisting wheels. When the hoisting ropes are wound, the screen rod is pressed into the groove of the rotating tube sleeve, and the curtain is wound outside the rotating tube sleeve. Since the outer circle of the hoisting wheel sleeve is not connected to the periphery of the projection screen, the rotating tube sleeve will not hinder the winding of the curtain. The convex groove at the outlet of the hoisting rope increases the thickness of the outside of the hoisting wheel sleeve. After the hoisting rope under load contacts the convex groove, the winding diameter of the hoisting rope is increased, which prevents the hoisting wheel sleeve from rotating with the hoisting wheel, so that the hoisting rope will not be wound on the outer circle of the hoisting wheel sleeve.

[0055] Example Two

[0056] In this embodiment, unlike example one, the number of hoisting wheels is three or more, two of which are arranged on the left and right sides of the rotating tube, and the remaining hoisting wheels are evenly arranged on the rotating tube. The rotating tube sleeve is segmented and arranged on the rotating tube according to the arrangement position of the hoisting wheels. This arrangement can effectively prevent the middle part of the curtain from sagging and causing the surface of the curtain to be uneven due to the excessive length of the curtain.

[0057] Example Three

[0058] In this embodiment, one rotating tube sleeve is arranged on each side of the rotating tube, and one or more rotating tube sleeves are arranged in the middle of the rotating tube. The hoisting wheels are arranged between adjacent rotating tube sleeves as needed, which is one of the variations of the present application and is within the scope of protection of the present application.

[0059] Example Four

[0060] In the embodiment, the winding wheel sleeve comprises two first winding wheel sleeve pressing blocks and second winding wheel sleeve pressing blocks, each of which is semicircular, and the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are locked with each other and are sleeved on the outside of the winding wheel, the winding rope outlet is arranged at the joint of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block, and the roller shafts are arranged at the edges of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block in the length direction of the winding rope outlet. When the winding rope is pulled out of the winding rope outlet, the winding rope is pressed against the roller shaft on one side of the winding rope outlet, and the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are fixed on the outside of the winding wheel by being locked with each other, so that the winding rope on the winding wheel is limited by the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block when the bottom of the winding rope is not under load or when the curtain at the bottom of the winding rope is lifted by a person, and the winding rope on the winding wheel will not be scattered. Since the roller shafts are arranged on both sides of the winding rope outlet and are larger than the outer circle of the winding wheel sleeve, the winding rope is guided during winding and unwinding, and the winding diameter is increased when the winding rope under load is in contact with the roller shaft, so that the winding wheel sleeve is prevented from rotating with the winding wheel, and the winding rope will not be wound on the outer circle of the winding wheel sleeve during winding.

[0061] Embodiment five

[0062] In the embodiment, the convex groove is integrated with the winding wheel sleeve, so that the wall thickness of the winding wheel sleeve is increased, the winding diameter of the winding rope is increased, the winding wheel sleeve is prevented from rotating with the winding wheel, and the winding rope will not be wound on the outer circle of the winding wheel sleeve during winding.

[0063] In the drawings, the position relationship is only used for example description and cannot be understood as a limitation of the patent; obviously, the above embodiments of the utility model are only examples for clearly illustrating the utility model and are not a limitation of the embodiments of the utility model. For ordinary skilled in the art, other different forms of changes or changes can be made on the basis of the above description. Here, all the embodiments cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claims.

Claims

1. A self-winding projection screen, comprising a rotating tube, a rotating tube sleeve, a winding wheel, a winding rope, a screen upper rod, a screen cloth, a screen lower rod and a driving motor for driving the rotating tube to rotate, characterized in that: the rotating tube sleeve and the winding wheel are arranged on the rotating tube, and the rotating tube sleeve is provided with a groove in the length direction which can accommodate the screen upper rod; the winding wheel is provided with a winding wheel sleeve which can rotate in the axial direction, and the winding wheel sleeve is provided with a winding rope outlet in the length direction along the rotating tube; the edge of the winding rope outlet in the length direction is provided with a convex groove which increases the thickness of the outer side of the winding wheel sleeve, one end of the winding rope is connected to the rotating tube and is wound around the winding wheel, and the other end is connected to the screen upper rod after being pulled out of the winding rope outlet of the winding wheel sleeve; one end of the screen cloth is connected to the screen upper rod, and the other end is connected to the screen lower rod. The convex groove is a roller shaft which is equivalent in length to the winding rope outlet, and the two ends of the roller shaft are connected to the fixed parts at the two ends of the winding rope outlet in the length direction. The winding wheel sleeve comprises two first winding wheel sleeve pressing blocks and two second winding wheel sleeve pressing blocks which are both semicircular in shape. The first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block each comprise a winding wheel sleeve pressing block body, a positioning and mounting upper block, a positioning and mounting lower block and a pressing and positioning edge with a locking hole. The positioning and mounting upper block and the positioning and mounting lower block are arranged respectively on the two sides of the top of the winding wheel sleeve pressing block body.

2. The self-contained reel-up projection screen of claim 1, wherein: The pressing and positioning edge is arranged at the bottom of the winding wheel sleeve pressing block body.

3. The self-contained reel-up projection screen of claim 2, wherein: When the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are locked together, the pressing and positioning edges of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are locked together, the positioning and mounting upper block of the first winding wheel sleeve pressing block is locked on the positioning and mounting lower block of the second winding wheel sleeve pressing block, the positioning and mounting lower block of the first winding wheel sleeve pressing block is locked on the positioning and mounting upper block of the second winding wheel sleeve pressing block, and the roller shaft is arranged detachably on the positioning and mounting upper blocks of the first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block. The first winding wheel sleeve pressing block and the second winding wheel sleeve pressing block are symmetrical with each other. The winding wheel sleeve pressing block body is provided with a connecting reinforcing rib at the winding rope outlet, and the connecting reinforcing rib is of an integral structure with the winding wheel sleeve pressing block body. The bottom of the winding rope is provided with a winding rope fixing part. The winding rope fixing part is provided with a fastening screw hole and a fastening screw, and when the winding rope passes through the winding rope fixing part, the fastening screw is pressed against the winding rope after passing through the fastening screw hole.

4. The self-contained reel-up projection screen of claim 3, wherein: The top of the screen upper rod is provided with an open groove in the length direction which can accommodate the rotation and sliding of the winding rope fixing part, and the open groove is provided with a communication port for adjusting the fastening screw on the winding rope fixing part.

5. The self-contained reel-up projection screen of claim 4, wherein: One or more rotating tube sleeves are arranged between adjacent winding wheels.

6. The self-contained reel-up projection screen of claim 1, wherein: One or more winding wheels are arranged between adjacent rotating tube sleeves. An auxiliary screen is further arranged on the screen upper rod. A projection screen protection shell and a rotating tube rotating shaft are further provided.

7. The self-contained reel-up projection screen of claim 1, wherein: The two sides of the rotating tube are rotatably arranged in the projection screen protection shell through the rotating tube rotating shaft.

8. The self-contained reel-up projection screen of claim 1, wherein: ​ 9. The self-contained reel-up projection screen of claim 1, wherein: ​ 10. The self-contained reel-up projection screen of claim 1, wherein: ​ ​ The bottom of the projection screen protection shell is provided with a gap for the hoisting rope, the screen upper rod, the curtain and the screen lower rod to pass through.

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