CN212112112U - Liftable screen - Google Patents

Abstract

The application discloses a liftable screen, which comprises a shell, wherein an accommodating space is formed in the shell; a screen body; the lifting part is arranged in the accommodating space and comprises a belt wheel, a belt spring and a fixing part, the belt spring is used for supporting the screen body, and one end of the belt spring is connected with the screen body; the other end of the belt spring is fixed on a belt wheel, and the belt wheel is used for winding/unwinding the belt spring; the fixing member is located at one side of the band spring and is used for fixing the band spring so as to prevent the band spring from retracting. In this way, the screen has simple integral structure, small thickness and light weight.

Description

Liftable screen

Technical Field

The application relates to the technical field of electronic equipment, in particular to a liftable screen.

Background

The laser television is an ultra-short-focus projection device adopting a laser light source matched with a projection display technology, can easily realize a large-size display effect which is difficult to realize by a traditional liquid crystal television, and has higher cost performance. Laser television usually needs to be matched with a laser television screen to achieve the best display effect. On one hand, the wall surface of a common household is a surface similar to diffuse reflection, so that most of light emitted by the laser television cannot be watched by a viewer, and the projection effect is greatly reduced. On the other hand, since ambient light can reduce the contrast of a projected picture, a laser television screen needs a certain light resistance to ensure a good display contrast. Therefore, the laser television screen has important significance for ensuring the display effect of the laser television.

The inventor of the present application finds that most of the common screen frames of laser televisions on the market are fixed structures in a long-term research and development process. The television screen with the fixed structure occupies a certain space no matter whether the television screen is watched or not, and the position of the screen is fixed after the television screen is installed, so that the position is difficult to adjust again.

SUMMERY OF THE UTILITY MODEL

The main technical problem who solves of this application provides a screen of liftable, can simplify screen structure for the whole frivolous more of screen.

In order to solve the technical problem, the technical scheme adopted by the application is that a liftable screen is provided, and the screen comprises: the shell is provided with an accommodating space; a screen body; the lifting part is arranged in the accommodating space and comprises a belt wheel, a belt spring and a fixing part, the belt spring is used for supporting the screen body, one end of the belt spring is connected with the screen body, the other end of the belt spring is fixed on the belt wheel, and the belt wheel is used for winding/unwinding the belt spring; the fixing member is located at one side of the band spring and is used for fixing the band spring so as to prevent the band spring from retracting.

Wherein, the lifting part also comprises a connecting piece, and one end with a spring is connected with the screen body through the connecting piece.

The fixing piece comprises a friction wheel, the friction wheel is arranged between the belt wheel and the connecting piece, and the friction wheel is used for pushing the belt spring to be unfolded along a preset direction.

The screen further comprises a guide groove, the guide groove is formed in one side of the belt wheel, part of the belt spring is arranged in the guide groove, the guide groove is arc-shaped, and the curvature of the guide groove is gradually reduced along the winding direction of the belt spring.

The lifting part further comprises a flexible sleeve, one end of the flexible sleeve is fixed on the connecting piece, and the flexible sleeve is used for being unfolded together with the belt spring and sleeving the belt spring on the outer side.

The lifting part further comprises a first volute spring, and the first volute spring is connected with the belt wheel and used for providing rolling torque for the belt wheel in a rolling process.

The lifting part further comprises a second volute spring, the second volute spring is used for enabling the belt spring to have retraction force when being wound, one end of the second volute spring is connected with the belt spring, and the other end of the second volute spring is connected with the belt wheel.

The screen further comprises a winding shaft and a third volute spring, the winding shaft is used for winding/unwinding the screen body, and the third volute spring is connected with the winding shaft, so that the screen body is tightened on the winding shaft in the winding process.

The belt wheel comprises a first belt wheel and a second belt wheel, the belt spring comprises a first belt spring and a second belt spring, the first belt wheel is used for winding/unwinding the first belt spring, the second belt wheel is used for winding/unwinding the second belt spring, and after the first belt spring and the second belt spring are unfolded, the concave surface of the first belt spring is opposite to the concave surface of the second belt spring.

Wherein, the mounting includes the inner pin, and the inner pin sets up between first band pulley and second band pulley, adjusts the inner pin and can fix the belt spring.

The lifting part comprises a first lifting part and a second lifting part, the first lifting part is arranged along a first direction, the second lifting part is arranged along a second direction, and the first direction is vertical to the second direction.

Wherein, the screen body is provided with the absorption piece with the position of taking the spring contact, adsorbs the piece and is used for making the screen body with take the spring laminating.

The beneficial effects of the embodiment of the application are that: be different from prior art, the screen of the liftable of this application embodiment is including casing, screen body and lift portion. The screen body is connected to the one end of taking the spring including taking spring, band pulley and mounting, owing to have the arc cross-section when taking the spring to expand, consequently takes the spring to have great bending moment backward bearing capacity, and when the screen body expanded, the accessible utilized the bearing capacity who takes the spring supported the screen body, and utilized the characteristics that takes the spring to have elastic deformation can realize the rolling of screen body and the conversion of expansion state. The liftable screen of this embodiment simple structure, thickness is thinner and weight is lighter.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a liftable screen according to the present application;

FIG. 2 is a cross-sectional view of the elevator portion of FIG. 1;

FIG. 3 is a schematic view of the screen of FIG. 1 with a spring deployed for lifting and lowering;

FIG. 4 is a schematic diagram of the structure of one embodiment of the belt spring of FIG. 2;

FIG. 5 is a schematic view of the load bearing capacity of the embodiment with springs of FIG. 4;

FIG. 6 is a structural schematic diagram of a cross-section of an embodiment of the lifting portion of FIG. 1;

FIG. 7 is an enlarged view of circle C of FIG. 2;

FIG. 8 is a top view of an embodiment of a lifting portion distribution in a liftable screen according to the present application;

FIG. 9 is a top view of another embodiment of a distribution of lifters in a liftable screen of the present application;

FIG. 10 is a top view of yet another embodiment of a distribution of lifting portions in a liftable screen of the present application;

fig. 11 is a schematic structural view of an embodiment of an elastic buckle in a liftable screen according to the present application.

Detailed Description

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

The laser television products on the market at present mainly use fixed screens, and the liftable screens either need manual expansion or rolling, are not convenient enough, or need thicker supporting structure, and are not beautiful enough to be seen from the side or the back. The application provides a liftable screen, simple structure not only, it is comparatively frivolous, and bearing capacity is strong.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a liftable screen according to the present application. The liftable screen of the present embodiment includes a housing 3, a screen body 1, and a lifting portion 2. The housing 3 is formed with an accommodating space, and the housing 3 is used for supporting and protecting the overall structure of the screen body 1 and the lifting part 2.

Specifically, the screen body 1 is a screen main body with a display function, and the screen body 1 can be of a flexible structure for rolling the screen body 1. The screen body 1 may be made of a film material such as Polyethylene terephthalate (PET) or Polyurethane (PU) as a base material, and may be processed to form a microstructure on the surface thereof, or to cover a paint film.

Further, the screen further includes a winding shaft (not shown), the winding shaft can be fixed in the accommodating space, and the winding shaft can rotate around a central axis thereof to wind or unwind the screen body 1. The screen body 1 can be located in the accommodating space formed by the shell 3 after being rolled up so as to protect the screen body 1 from water, dust and the like.

Preferably, the screen may further include a third scroll spring (not shown) connected to the winding shaft. The rolling axle can utilize the resilience force of third volute spring when rolling screen body 1, makes the rolling axle further rotatory to the direction of rolling, and then makes screen body 1 tighten up on the rolling axle.

The lifting part 2 is arranged in the accommodating space and used for unfolding and rolling the screen body 1. As shown in fig. 2, fig. 2 is a sectional view of the elevating part in fig. 1, and the elevating part 2 includes a pulley 23, a belt spring 21, and a fixing member.

The belt spring 21 is used for supporting the screen body 1, and one end of the belt spring 21 is connected with the screen body 1. The other end of the belt spring 21 is fixed to a pulley 23, and the pulley 23 is used to wind/unwind the belt spring 21. The fixing member is located at one side of the belt spring 21 for fixing the belt spring 21 after the belt spring 21 is unwound to prevent the belt spring 21 from being retracted to be wound around the pulley 23.

Alternatively, the lifting part 2 may further include a connection member 22, and one end of the belt spring 21 is connected to the screen body 1 through the connection member 22. The crossbeam of screen body 1 one side can link to each other with connecting piece 22, and wherein the connected mode of screen body 1 and connecting piece 22 can be threaded connection, riveting or bonding to guarantee that screen body 1 can go up and down along with lift portion 2.

Optionally, the lifting portion 2 may further include a housing 20, and the pulley 21, the belt spring 23, and the fixing member may be disposed within the housing 20 to enhance protection of the internal components of the lifting portion 2.

As shown in fig. 3, the belt spring 21 is unfolded to support the screen body 1. As shown in fig. 4, the belt spring 21 is a long strip in the shape of a circular arc. In the present embodiment, the basic principle that the belt spring 21 can serve as the structural support is to utilize the characteristic that the gaussian curvature of the elastic structure remains unchanged (under the condition that yielding does not occur) in the range where yielding does not occur. According to the Gaussian wonderful theorem, the Gaussian curvature is the product of the main curvature of the curved surface, the main curvature is the maximum and minimum values of the curvature passing through one point on the curved surface, and the maximum and minimum values are orthogonal. When the material is processed into the structure with the spring 21, the gaussian curvature is 0, and the curvature (one of the main curvatures) in the cross-sectional direction after bending is not zero, but the gaussian curvature is inevitably 0 (i.e., a straight line is maintained) in the length direction in order to maintain the gaussian curvature constant (═ 0), so that high rigidity is maintained in the length direction. This principle has been applied to structures in the construction field, such as vaults, corrugated board, etc. According to the above principle, the belt spring 21 may be made of a material having a wide elastic range, preferably a high-quality carbon structural steel, and may be formed into a desired shape through a heat treatment process. In other embodiments, carbon fiber or the like may be used, as desired.

The deformation of the belt spring 21 in the unfolded state is mainly divided into bending and torsion. The present embodiment, among other things, primarily utilizes the ability of the belt spring 21 to carry bending loads. Depending on the design of the belt spring 21, the bending direction can be divided into forward and reverse directions, and usually the moment required to bend the belt spring in the forward direction is much less than the moment required to bend the belt spring in the reverse direction, i.e. the belt spring 21 has an asymmetric character in its ability to withstand bending moments. Taking the copper-beryllium alloy as an example of the material of the belt spring 21, when the length of the belt spring is 200mm, the thickness of the belt spring is 0.1mm, the radius of the section circle is 13.3mm, and the central angle of the belt spring is 106 degrees, as shown in fig. 5, the bearing capacity of the belt spring is obviously asymmetric, and the bending moment required by the deformation of the belt spring 21 after the critical bending moment is exceeded is rapidly reduced to a lower level. Therefore, in order to facilitate the unfolding and rolling of the belt spring 21, the liftable screen of the embodiment may further include a guide groove 26, the guide groove 26 is disposed at one side of the pulley 23 and is arranged along the unfolding direction of the belt spring 21, a part of the belt spring 21 is disposed in the guide groove 26, and the rolling of the belt spring 21 can be achieved by changing the cross-sectional shape of the belt spring 21 through the guide groove 26 and matching the rolling moment during the rolling. The whole deformation process of the belt spring 21 is in the elastic deformation range, so that the mechanical property of the spring is not influenced.

Specifically, the guide groove 26 may be designed according to the sectional shape of the belt spring 21, ensuring the sectional uniformity of the unfolded state of the belt spring 21. Preferably, the guide groove 26 is arc-shaped, and the curvature of the guide groove 26 is gradually reduced in the winding direction of the belt spring 21. That is, the outermost end of the guide groove 26 is arc-shaped, so as to ensure the cross section of the unfolded spring, and the inner part of the guide groove gradually transitions into arc or straight line with smaller curvature, so that the belt spring 21 reaches the position near the belt wheel 23 and has smaller deformation resistance, thereby facilitating the winding.

When the belt spring 21 is unfolded, the driving mechanism can drive the belt wheel 23 to rotate, the belt spring 21 is gradually pushed to be unfolded along the guide groove 26 and finally ascends along the vertical direction, and after the belt spring 21 is completely unfolded, the fixing piece can fix the belt spring 21 to prevent the belt spring 21 from retracting. When winding, the fixing member 21 releases the fixing of the belt spring 21, and the belt spring 21 can be wound around the pulley 23 by rotating the driving mechanism in the reverse direction.

In a specific embodiment, the lifting portion further includes a first volute spring (not shown) connected to the pulley 23, and the first volute spring can provide a winding torque to the pulley 23 during winding by using a resilient force of the first volute spring. In another embodiment, the lifting unit 2 further includes a second spiral spring (not shown), one end of the second spiral spring is connected to the belt spring 21, the other end of the second spiral spring is connected to the pulley 23, and the second spiral spring is used for enabling the belt spring 21 to have a retraction force when being wound, so that the winding of the belt spring 21 is facilitated.

The structural parameters having a large influence on the mechanical properties of the belt spring 21 mainly include thickness, angle of spread, radius of curvature (or width), and the like. The bearing capacity of the structure can be improved by increasing the thickness and the unfolding angle, but the characteristic of asymmetric bearing capacity cannot be changed, namely the bearing structure with the spring 21 possibly has the instability problem. Therefore, in a preferred embodiment, an axisymmetrically distributed structure with the belt springs 21 can be adopted, and the belt springs 21 on one side are respectively used as main bearing structures when being bent, so that the problem of asymmetric bending moment bearing capacity of the belt springs 21 is solved. In addition, the symmetrically distributed strip springs 21 also have a certain resistance to torsional deformation.

Specifically, the pulley 23 includes a first pulley 231 and a second pulley 232, the belt spring 21 includes a first belt spring 211 and a second belt spring 212, the first pulley 231 is used for winding/unwinding the first belt spring 211, the second pulley 232 is used for winding/unwinding the second belt spring 212, and after the first belt spring 211 and the second belt spring 212 are unwound, a concave surface of the first belt spring 211 is disposed opposite to a concave surface of the second belt spring 212.

One ends of the first belt spring 211 and the second belt spring 212 are always fixed together and maintain the unfolded state, and the ends can be fixedly connected with a structure needing to be carried. In the present embodiment, a synchronizing gear is fixed to the first pulley 231 and the second pulley 232 to realize symmetrical rotation of the first pulley 231 and the second pulley 232. When the belt spring 21 is unwound, the first pulley 231 and the second pulley 232 are driven by the first driving mechanism to symmetrically rotate, so as to gradually push the first belt spring 211 and the second belt spring 212 to be unwound or to advance along the guide groove 26, and finally to ascend in the vertical direction. In other embodiments, different driving mechanisms may be used to drive the first pulley 231 and the second pulley 232 to rotate symmetrically, so long as the linear speeds of the first pulley 231 and the second pulley 232 are the same.

The belt spring 21 can be clamped by the fixing member after being completely unfolded, and the retraction of the belt spring 21 is avoided. In one particular embodiment, the fastener may be an inner pin 25, and the inner pin 25 may be disposed within the housing 20. In the present embodiment, as shown in fig. 6, a sectional view of the lifting portion 2 in a direction perpendicular to the direction in which the belt spring 21 is deployed, the inner pin 25 is partially received in the guide groove 26 and is disposed between the first belt spring 211 and the second belt spring 212. The belt spring 21 can be secured by adjusting the inner pin 25 to prevent the belt spring 21 from retracting to wind around the pulley 21. The specific implementation mode is that, as shown in fig. 7, the bottom of the inner pin 25 is provided with a threaded hole, a screw rod 252 is inserted in the threaded hole, the screw rod 252 can be connected with an external driving gear 253, and the driving gear 253 is driven by a power mechanism. In the unfolding process, the power mechanism drives the screw rod 252 to rotate through the driving gear 253, the screw rod 252 can rotate but cannot generate axial displacement, the inner pin 25 can linearly move due to the bottom threads 251, and the inner pin 25 cannot rotate under the limiting action of the shell 20 and the belt spring 21. Through the reasonable design of the transmission ratio, the inner pin 25 just rises to a position capable of locking the belt wheel 23 through friction force after the screen body 1 is completely unfolded, and clamps the belt spring 21. The screw 252 reversely rotates when winding, so that the locking of the pulley 23 is released, and the belt spring 21 can retract and move.

In other embodiments, the screen further comprises a friction wheel 24, the friction wheel 24 being arranged between the pulley 23 and the connecting piece 22. The friction wheel 24 can be used to push the belt spring 21 to be unfolded in a predetermined direction, and the unfolding process can be realized by driving the friction wheel 24 to push the belt spring 21 to advance through a second driving mechanism so as to realize the unfolding at a constant speed. The friction wheel 24 may also function as an auxiliary fixing strap spring 21. For example, the friction wheel 24 is fixed to one end of the volute spring, the other end of the volute spring can be fixed to the housing 3 or the casing 20, the volute spring is reasonably arranged in a direction such that the volute spring releases elastic potential energy when the band spring 21 is unfolded, and the elastic potential energy is gradually tightened and stored when the band spring is wound, so that the volute spring has resistance to winding of the band spring 21, which is equivalent to increase the reverse rotation damping of the friction wheel 24.

Optionally, the lifting portion 2 further comprises a flexible sleeve (not shown), one end of which is fixed to the connecting member 22 and the other end of which can be fixed to the housing 20. The flexible thin sleeve can be stacked between the connecting member 22 and the housing 20 when the band spring 21 is wound, and the flexible sleeve is unwound together with the band spring 21 and covers the band spring 21 on the outside after unwinding, so that the torsion of the band spring 21 can be prevented. When the belt spring 21 includes the first belt spring 211 and the second belt spring 212, the flexible sleeve can ensure that the first belt spring 211 and the second belt spring 212 which are symmetrically distributed are attached together, so as to avoid separation, torsion and the like.

The number and arrangement of the elevating parts 2 can be flexibly adjusted according to the size of the adopted belt spring 21 and the size, weight and design load of the screen body 1. The number of the lifting parts 2 can be set to 2, 3, 4, 5, etc. according to actual conditions. In a specific embodiment, as shown in fig. 8, the number of the lifting portions 2 is 2, and the lifting portions are respectively fixed at two ends of the screen body 1 to lift and support the screen body 1. In another specific embodiment, as shown in fig. 9, the number of the lifting parts 2 may be 4, and in this embodiment, on the basis of the previous embodiment, two lifting parts 2 are further provided at equal intervals in the middle to be able to bear the weight of the screen body 1 as a whole.

In still another embodiment, considering that the actual load of the lifting and lowering part 2 may come from different directions and that the tension of the side of the screen body 1 is ensured, as shown in fig. 10, the lifting and lowering part 2 includes a first lifting and lowering part 201 and a second lifting and lowering part 202, the first lifting and lowering part 201 is disposed along a first direction a, and the second lifting and lowering part 202 is disposed along a second direction B, wherein the first direction a is perpendicular to the second direction B. By arranging the first and second lifters 201 and 202 in different arrangement directions, resistance to a lateral load can be provided.

In order to achieve resistance to lateral loads, lateral deformation of the coupling screen body 1 and the strap spring 21 is required in the present embodiment. In a specific embodiment, the contact position of the screen body 1 and the belt spring 21 is provided with an absorption member, such as a soft magnetic tape, a magic tape, etc., to ensure the attachment of the screen body 1 and the belt spring 21. In other alternative embodiments, as shown in fig. 11, a plurality of elastic buckles 12 are provided at the position where the screen body 1 contacts the belt spring 21. The elastic buckle 12 is fixed on the back of the screen body 1 and has certain elasticity. The elastic buckle 12 can just clamp two sides of the belt spring 21 when the screen body 1 is unfolded, and the lateral bearing capacity of the belt spring 21 provides lateral tension for the screen body 1. Further, this screen of liftable still includes regulating part (not shown), and the regulating part can be fixed on casing 3, and the regulating part is arranged in when screen body 1 expandes, makes to take spring 21 can the joint in elasticity buckle 12, when screen body 1 rolling, makes to take spring 21 to deviate from in elasticity buckle 12. In this embodiment, the elastic buckle 12 is rolled together with the screen body 1.

Different from the prior art, the embodiment of the application supports the screen body 1 through the bearing capacity of the belt spring 21, and utilizes the characteristic that the belt spring 21 has elastic deformation to complete the conversion of the rolling and unfolding states of the screen body 1. Through this kind of mode for the screen simple structure of this application liftable, thickness is thinner and weight is lighter.

The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (12)

1. A liftable screen, characterized in that, the screen includes:

the shell is provided with an accommodating space;

a screen body;

the lifting part is arranged in the accommodating space and comprises a belt wheel, a belt spring and a fixing part, the belt spring is used for supporting the screen body, and one end of the belt spring is connected with the screen body; the other end of the belt spring is fixed on the belt wheel, and the belt wheel is used for winding/unwinding the belt spring; the fixing member is located at one side of the band spring and is used for fixing the band spring so as to prevent the band spring from retracting.

2. The screen of claim 1, wherein the elevator portion further comprises a connector, and the end with the spring is connected to the screen body through the connector.

3. A screen according to claim 2, further comprising a friction wheel disposed between said pulley and said connector, said friction wheel for urging said belt spring to unwind in a predetermined direction.

4. A screen as recited in claim 3, further comprising a guide slot disposed on one side of the pulley, wherein a portion of the belt spring is disposed in the guide slot, the guide slot is arcuate, and the curvature of the guide slot decreases in a direction in which the belt spring is wound.

5. A screen according to claim 2, wherein said lifting portion further comprises a flexible sleeve fixed at one end to said connecting member, said flexible sleeve being adapted to be deployed with said belt spring and to externally embrace said belt spring.

6. The screen of claim 1, wherein the lift portion further comprises a first volute spring coupled to the pulley for providing a wind-up torque to the pulley during wind-up.

7. The screen of claim 1, wherein the lifting portion further comprises a second spiral spring for providing the belt spring with a retraction force when being wound, one end of the second spiral spring being connected to the belt spring, and the other end of the second spiral spring being connected to the pulley.

8. The screen of claim 1, further comprising a winding shaft for winding/unwinding the screen body and a third scroll spring connected to the winding shaft so that the screen body is tightened on the winding shaft during winding.

9. The screen of claim 1, wherein the pulleys comprise a first pulley and a second pulley, the belt spring comprises a first belt spring and a second belt spring, the first pulley is used for winding/unwinding the first belt spring, the second pulley is used for winding/unwinding the second belt spring, and after the first belt spring and the second belt spring are unfolded, a concave surface of the first belt spring is opposite to a concave surface of the second belt spring.

10. A screen according to claim 9, wherein said fixing member comprises an inner pin disposed between said first pulley and said second pulley, adjustment of said inner pin enabling fixing of said belt spring.

11. A screen as recited in claim 10, wherein the elevator portion includes a first elevator portion disposed along a first direction and a second elevator portion disposed along a second direction, wherein the first direction is perpendicular to the second direction.

12. The screen of claim 11, wherein a suction member is disposed at a position where the screen body contacts the belt spring, and the suction member is used for attaching the screen body to the belt spring.

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