CN220064600U - Projection folding screen convenient to transport and capable of keeping flat - Google Patents

Abstract

The utility model relates to the field of projection screens, in particular to a projection folding screen which is convenient to transport and keeps flat, comprising a plurality of projection substrates, a reflective flexible membrane and a leveling adjustment device, wherein the projection substrates are arranged side by side, the reflective flexible membrane is attached to the surfaces of the projection substrates, an adjustment space is reserved between two adjacent projection substrates, the leveling adjustment device is respectively connected with the two adjacent projection substrates, and the reflective flexible membrane between the two adjacent projection substrates is stretched and leveled by the leveling adjustment device. The traditional projection hard screen is large in size, high in transportation cost and inconvenient to install in upstairs, and the transportation cost is reduced and a user can conveniently place the screen in the elevator upstairs in a folding mode. In addition, the whole installation is very convenient, only a plurality of projection substrates are required to be unfolded, and the reflection flexible membrane between two adjacent projection substrates is stretched and leveled through the leveling and adjusting device, so that the product achieves the effect of projecting a hard screen.

Description

Projection folding screen convenient to transport and capable of keeping flat

Technical Field

The utility model relates to the field of projection screens, in particular to a projection folding screen which is convenient to transport and keeps flat.

Background

The television is a common electric appliance in our life, the television is a black-and-white television at the earliest time, people with poor black-and-white television effect look not rich enough in color, later color televisions gradually appear, people are increased in color, so that the people can watch more vivid images, but long-term watching hurt to our eyes is caused to cause myopia, later projection appears, and during the daytime of projection, the effect of experience is poor, but the effect of watching at night is very good, later laser television appears, the laser television is similar to the projection, but has good effect and 3D feel, the eyes are not hurt compared with the traditional television, and later a product which is accepted by consumers is realized.

The traditional laser television needs to be matched with special projection equipment and a special projection screen for use, and the existing special projection screen is generally divided into a projection hard screen or a projection soft screen;

among other things, projection hard screens now suffer from the following disadvantages: because the projection hard screen is of an integrated structure after leaving the factory, the projection hard screen is difficult to carry after the size of the projection hard screen exceeds 100 inches. Although the low floors can be handled manually, the oversized floor is such that the user on the high floors cannot be transported by means of an elevator, but can only be lifted by means of a more costly crane, which greatly increases the costs for the consumers.

The projection soft curtain has the following defects: although the projection soft screen is directly used and the problem of difficult transportation can be overcome, in the prior art, the projection soft screen achieves the leveling effect through the tension of the membrane by the springs around the frame of the screen, the stability of the product is insufficient, the service time is long, and the elasticity of the springs reduces the screen to lose leveling.

Disclosure of Invention

In order to solve the problems, the utility model provides the projection folding screen which is convenient to transport and keeps flat, and the transportation cost is reduced and a user can conveniently put the screen into an elevator upstairs in a folding mode. In addition, the whole installation is very convenient, only a plurality of projection substrates are required to be unfolded, and the reflection flexible membrane between two adjacent projection substrates is stretched and leveled through the leveling and adjusting device, so that the product achieves the effect of projecting a hard screen.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a convenient transportation and keep smooth projection folding screen, includes a plurality of projection base plates, reflection flexible diaphragm, flattening adjusting device, and wherein a plurality of projection base plates arrange side by side, and the laminating of reflection flexible diaphragm is at the surface of a plurality of projection base plates, and all reserves the adjustment space between two adjacent projection base plates, and flattening adjusting device is connected with two adjacent projection base plates respectively, and is located the reflection flexible diaphragm between two adjacent projection base plates and is stretched to be leveled through flattening adjusting device.

Further, one or more leveling adjustment devices are arranged in each adjustment space, and the leveling adjustment devices are uniformly arranged along the length direction of the adjustment space.

Further, the leveling and adjusting device comprises an adjusting cover body, a fixed block, an adjusting block and an adjusting bolt, wherein the fixed block is fixed on a projection substrate, the adjusting block is fixed on an adjacent projection substrate, and the adjusting block is aligned with the fixed block, one end of the adjusting cover body is arranged on the fixed block and is fixedly connected with the fixed block through the fixed bolt, the other end of the adjusting cover body is arranged on the surface of the adjusting block, and the adjusting bolt sequentially penetrates through the adjusting cover body and the adjusting block; the adjusting block is enabled to move along the direction of the adjusting cover body by rotating the adjusting bolt, and the reflecting flexible membrane between the two projection substrates is stretched and flattened.

Further, the adjusting cover body comprises a U-shaped cover shell and matching blocks matched and installed at two ends of the U-shaped cover shell, wherein screw connecting parts are arranged on two inner side walls of the U-shaped cover shell, and the two inner side walls are fixed by passing through the matching blocks and the screw connecting parts through screws; and a first yielding hole for the passing of the adjusting bolt is formed on the surface of the assembling block close to the adjusting block, and a second yielding hole for the passing of the fixing bolt is formed on the surface of the assembling block close to the fixing block.

Further, the adjusting block is the same with the structure of fixed block, wherein the adjusting block includes U type base and sets up the connecting portion at U type base surface, and this connecting portion both ends are provided with the internal thread respectively, and wherein the connecting portion of adjusting block passes through internal thread and adjusting bolt spiro union, and wherein the U type base surface of adjusting block sets up the first connecting hole that is used for being connected with the projection base plate, and wherein the U type base surface of fixed block sets up the second connecting hole that is used for being connected with the projection base plate.

Further, the upper ends of the two side walls of the U-shaped base are outwards extended with first clamping pieces, wherein a fitting track is formed between the first clamping pieces and the projection substrate, and the lower ends of the two side walls of the U-shaped housing are inwards extended with second clamping pieces, and the second clamping pieces of the U-shaped housing are movably fitted in the fitting track.

Furthermore, a plurality of wall hanging fittings are also assembled on the back surface of the projection substrate.

Further, the back of the projection substrate is uniformly provided with a plurality of magnetic attraction sheets.

Further, the reflective flexible membrane is a long Jiao Xianxing fresnel membrane/long Jiao Yuanxing fresnel membrane/long Jiao Yuanxing fresnel membrane/short focal black grid membrane/short Jiao Yuanxing fresnel membrane/short Jiao Xianxing fresnel membrane/optical white membrane.

Further, the projection substrate comprises an aluminum honeycomb core substrate, a front aluminum plate and a back aluminum plate which are respectively arranged on the front side and the back side of the aluminum honeycomb core substrate, and the aluminum honeycomb core substrate adopts a hexagonal 3003 type aluminum honeycomb core.

Further, the surface of the back aluminum plate far away from the aluminum honeycomb core substrate is also provided with an iron sheet.

The utility model has the beneficial effects that: the utility model can divide the projection hard screen with the size of more than 100 inches into a plurality of projection substrates, simultaneously attach the reflective flexible membrane on the surfaces of the projection substrates, and then fold the projection hard screen in half by a folding mode. The traditional projection hard screen is large in size, high in transportation cost and inconvenient to install in upstairs, and the transportation cost is reduced and a user can conveniently place the screen in the elevator upstairs in a folding mode. In addition, the whole installation is very convenient, only a plurality of projection substrates are required to be unfolded, and the reflection flexible membrane between two adjacent projection substrates is stretched and leveled through the leveling and adjusting device, so that the product achieves the effect of projecting a hard screen.

Drawings

Fig. 1 is a schematic front view of a folding screen according to the present utility model.

Fig. 2 is a schematic view of the rear structure of the folding screen of the present utility model.

Fig. 3 is a schematic exploded view of the leveling device.

Fig. 4 is a schematic structural view of the U-shaped housing.

Fig. 5 is a schematic structural view of the U-shaped base.

Fig. 6 is a schematic structural view of the U-shaped housing and U-shaped base fitting.

Fig. 7 is a schematic view of a second solution for solving the problem of slight concave in the middle of the folding screen.

Fig. 8 is a schematic diagram of a structure of two projection substrates folded in half.

Reference numerals illustrate: the reflection flexible diaphragm 1, the projection substrate 2, the adjustment space 21, the leveling device 3, the adjustment cover 31, the U-shaped housing 311, the screw connection 3111, the second click piece 3112, the fitting block 312, the first yielding hole 3121, the second yielding hole 3122, the adjustment block 32, the U-shaped base 321, the first connection hole 3211, the connection portion 322, the internal thread 3221, the first click piece 323, the fixing block 33, the adjustment bolt 34, the fixing bolt 35, the wall hanging fitting 4, and the magnetic attraction piece 5.

Detailed Description

Referring to fig. 1-8, the present utility model relates to a projection folding screen which is convenient to transport and keeps flat, comprising a plurality of projection substrates 2, a reflective flexible membrane 1 and a leveling adjustment device 3, wherein the projection substrates 2 are arranged side by side, the reflective flexible membrane 1 is attached to the surfaces of the projection substrates 2, an adjustment space 21 is reserved between two adjacent projection substrates 2, the leveling adjustment device 3 is respectively connected with the two adjacent projection substrates 2, and the reflective flexible membrane 1 between the two adjacent projection substrates 2 is stretched and leveled by the leveling adjustment device 3.

This technical scheme is to traditional projection screen transportation and inconvenient problem of installation propose, through cutting apart projection screen into a plurality of projection base plates 2, arrange side by side and laminating reflection flexible membrane 1, and rethread flattening adjusting device 3 is with the flexible membrane 1 tensile of reflection between two adjacent projection base plates 2 level to reach convenient transportation and keep smooth effect. The advantage of this scheme lies in can reduce the cost of transportation, and the convenience of customers puts into the elevator upstairs with the screen, and the integral erection is also more convenient simultaneously, only need with a plurality of projection base plates 2 expansion can. The realization of the whole scheme needs to use technical means such as the reflective flexible membrane 1, the leveling device 3 and the like, thereby ensuring the flatness and the stability of the projection screen.

As a further optimization scheme, one or more leveling adjustment devices 3 are arranged in each adjustment space 21, and the leveling adjustment devices 3 are uniformly arranged along the length direction of the adjustment space 21.

The optimization scheme can further improve the flatness and stability of the whole projection screen, and the flatness of the reflective flexible membrane 1 can be more accurately adjusted by arranging one or more leveling adjustment devices 3 in each adjustment space 21, so that the flatness and stability of the whole projection screen are ensured. Meanwhile, the leveling adjusting devices 3 are uniformly arranged along the length direction of the adjusting space 21, so that the flatness of the whole projection screen is more uniform, the problem of local uneven height is avoided, and meanwhile, the flatness and stability of the whole projection screen can be improved, so that the projection screen is more suitable for high-quality projection requirements.

Further, the leveling adjustment device 3 comprises an adjustment cover 31, a fixed block 33, an adjustment block 32 and an adjustment bolt 34, wherein the fixed block 33 is fixed on a projection substrate 2, the adjustment block 32 is fixed on an adjacent projection substrate 2, the adjustment block 32 is aligned with the fixed block 33, one end of the adjustment cover 31 is arranged on the fixed block 33 and is fixedly connected with the fixed block 33 through the fixed bolt 35, the other end of the adjustment cover 31 is arranged on the surface of the adjustment block 32, and the adjustment bolt 34 sequentially penetrates through the adjustment cover 31 and the adjustment block 32; wherein the adjusting block 32 is moved in the direction of the adjusting cover 31 by rotating the adjusting bolt 34, and the reflective flexible membrane 1 between the two projection substrates 2 is stretched flat.

In the optimization scheme, the adjusting cover body 31, the fixed block 33, the adjusting block 32, the adjusting bolt 34, the fixed bolt 35 and other components jointly realize the accurate adjustment of the reflective flexible diaphragm 1, so that the flatness and the stability of the whole projection screen are ensured. Specifically, the fixing block 33 and the adjusting block 32 are respectively fixed on two adjacent projection substrates 2, one end of the adjusting cover body 31 is connected with the fixing block 33 through the fixing bolt 35, the other end of the adjusting cover body is connected with the adjusting block 32, the adjusting bolt 34 penetrates through the adjusting cover body 31 and the adjusting block 32, and the adjusting block 32 can be moved along the direction of the adjusting cover body 31 by rotating the adjusting bolt 34, so that the purpose of stretching the reflective flexible membrane 1 is achieved, and the flatness and stability of the whole projection screen are guaranteed.

Further, the adjusting cover 31 includes a U-shaped cover 311 and fitting blocks 312 fitted to both ends of the U-shaped cover 311, wherein both inner side walls of the U-shaped cover 311 are provided with screw connection portions 3111, and fixation of both is achieved by screws passing through the fitting blocks 312 and the screw connection portions 3111; and a first relief hole 3121 for the passage of the adjusting bolt 34 is provided near the surface of the fitting block 312 of the adjusting block 32, and a second relief hole 3122 for the passage of the fixing bolt 35 is provided near the surface of the fitting block 312 of the fixing block 33.

The U-shaped housing 311 and the fitting block 312 may be fixed together by screws passing through the fitting block 312 and the screw connection 3111. This design establishes a reliable connection between the adjustment housing 31 and the adjustment block 32 and the fixing block 33, ensuring stability and adjustability of the adjustment device.

The first relief hole 3121/the second relief hole 3122 formed on the surface of the fitting block 312 may enable the adjusting bolt 34 and the fixing bolt 35 to pass through the corresponding holes, so as to achieve connection with the adjusting block 32 and the fixing block 33. By rotating the adjusting bolt 34, the adjusting block 32 can be moved in the direction of the adjusting cover 31, thereby realizing the stretching and flatness adjustment of the reflective flexible membrane 1. At the same time, by the fixation of the fixing bolt 35, the fitting block 312 and the fixing block 33 can be kept stably connected.

Further, the adjusting block 32 has the same structure as the fixing block 33, wherein the adjusting block 32 comprises a U-shaped base 321 and a connecting portion 322 disposed on the surface of the U-shaped base 321, and two ends of the connecting portion 322 are respectively provided with an internal thread 3221, wherein the connecting portion 322 of the adjusting block 32 is screwed with the adjusting bolt 34 through the internal thread 3221,

wherein the surface of the U-shaped base 321 of the adjustment block 32 is provided with a first connection hole 3211 for connection with the projection substrate 2, and wherein the surface of the U-shaped base 321 of the fixing block 33 is provided with a second connection hole for connection with the projection substrate 2.

Specifically discussed therein, the adjustment block 32: comprising a U-shaped base 321 and a connecting portion 322. The U-shaped base 321 is a main body portion of the adjustment block 32, and the connection portion 322 is provided on the surface of the U-shaped base 321. The internal threads 3221 at both ends of the connection portion 322 are for screwing with the adjustment bolt 34. The purpose of this internal thread 3221 is to provide movement and adjustment functionality of the adjustment block 32. By rotating the adjusting bolt 34, the adjusting block 32 can be moved along the direction of the adjusting cover 31, and the purpose of stretching and flattening the reflective flexible membrane 1 can be achieved.

Fixed block 33: the structure is the same as that of the adjusting block 32, and includes a U-shaped base 321 and a connecting portion 322. The surface of the U-shaped base 321 is provided with a second connection hole for connection with the projection substrate 2. The function of the fixing block 33 is to provide a stable connection with the projection substrate 2, keeping the position of the fixing block 33 unchanged.

Meanwhile, the surfaces of the U-shaped bases 321 of the adjustment block 32 and the fixing block 33 are provided with a first connection hole 3211 and a second connection hole, respectively. These connection holes are used for connection with the projection substrate 2, ensuring firm coupling of the adjustment block 32 and the fixing block 33 with the projection substrate 2.

Further, the upper ends of the two sidewalls of the U-shaped base 321 are outwardly extended with first clamping pieces 323, wherein a fitting track is formed between the first clamping pieces 323 and the projection substrate 2, and the lower ends of the two sidewalls of the U-shaped housing 311 are inwardly extended with second clamping pieces 3112, wherein the second clamping pieces 3112 of the U-shaped housing 311 are movably fitted in the fitting track.

The U-shaped housing 311 can perform relative movement in the fitting track, so that the U-shaped housing 311 is directly fitted on the fixed block 33 and the adjusting block 32 in a sliding manner, and then the corresponding fitting block 312 is fitted.

Further, the rear surface of the projection substrate 2 is further provided with a plurality of wall hanging fittings 4,U, and the surface of the housing 311 is attached with buffer foam.

Because of the force of the leveling device 3, a slight concave V-shaped deformation may occur in the middle of the folding screen, in this embodiment, a first solution is provided: referring to fig. 1, two hooks are provided on the wall, and then a plurality of wall hanging fittings 4 are mounted on the projection substrate 2. The folding screen is hung on a wall, two ends of the outer side of the screen are pulled, meanwhile, buffer foam is attached to the outer surface of the U-shaped housing 311 outside the folding screen, and the inner concave folding screen is propped up and flattened by reacting force formed after the buffer foam contacts with a wall surface.

Referring to fig. 7, the second scheme: the magnetic sheet 5 is stuck on the wall surface, and as the 0.03mm iron sheet is used on the surface of the substrate of the folding screen, the folding screen can be directly adsorbed on the magnetic sheet 5, the whole concave deformation of the folding screen is leveled by the attraction of the magnetic sheet 5, and meanwhile, the product is installed on the wall surface.

As a further optimization, the reflective flexible diaphragm 1 is a long Jiao Xianxing fresnel diaphragm/a long Jiao Yuanxing fresnel diaphragm/a long Jiao Yuanxing fresnel diaphragm/a short-focus black grid diaphragm/a short Jiao Yuanxing fresnel diaphragm/a short Jiao Xianxing fresnel diaphragm/an optical white film.

The reflective flexible membrane 1 has the main function of improving the reflection efficiency and enhancing the display brightness and contrast. Different types of reflective flexible membrane 1 are suitable for different projection distances, projection sizes and light source types.

Long Jiao Xianxing fresnel film sheet: the method is suitable for the laser televisions with long projection distance and large projection size, and can focus light at the center of a screen, so that image distortion and chromatic dispersion are reduced.

Long Jiao Yuanxing fresnel film sheet: the method is suitable for the laser televisions with long projection distance and large projection size, and can uniformly distribute light on the whole screen, so that the images are clearer and brighter.

Long Jiao Yuanxing fresnel film sheet: similar to a long-focus circular Fresnel diaphragm, the reflective film has higher reflection efficiency and better color reduction capability, and is suitable for occasions with higher requirements on display effects.

Short-focus black-gate membrane: the method is suitable for the laser television with short projection distance, can reduce light scattering and reflection, and can enhance contrast and definition.

Short Jiao Yuanxing fresnel film sheet: the method is suitable for the laser televisions with short projection distance, and can focus light on a screen to improve brightness and color reproducibility.

Short Jiao Xianxing fresnel film sheet: the method is suitable for the laser television with short projection distance, can focus light at the center of a screen, and reduces image distortion and chromatic dispersion.

Optical white film: the light source is suitable for a laser television with a medium-length projection distance, has good reflection efficiency and color restoration capability, can uniformly distribute light on the whole screen, and improves the definition and brightness of images.

In summary, different types of reflective flexible films 1 may be selected according to factors such as the projection distance, the projection size, and the light source type of the laser television, so as to improve the display effect and the visibility.

As a further optimization scheme, the projection substrate 2 comprises an aluminum honeycomb core substrate, a front aluminum plate and a back aluminum plate which are respectively arranged on the front side and the back side of the aluminum honeycomb core substrate, and the aluminum honeycomb core substrate adopts a hexagonal 3003 type aluminum honeycomb core.

The design of the aluminum honeycomb core substrate meets the industry standard, and PVDF fluorocarbon baking paint is adopted, so that the aluminum honeycomb core substrate has good weather resistance and corrosion resistance. The PVDF fluorocarbon baking paint has higher surface hardness and wear resistance, can effectively protect the surface of a substrate from being damaged, has better ultraviolet resistance, can resist irradiation of sunlight, and is not easy to fade and age.

The core material of the aluminum honeycomb core substrate adopts a hexagonal 3003 type aluminum honeycomb core, has good rigidity and stability, and is light in weight and convenient to carry and install. The thickness of the aluminum foil is 0.04-0.06 mm, the side length is 5-6 mm, and the design can ensure the uniformity and stability of the substrate.

The roll forming technology is adopted to finish the forming of the front aluminum plate and the back aluminum plate, so that the flatness and the precision of the surface of the substrate can be ensured. The full-automatic machine equipment folds, and the processing efficiency and the product quality can be improved. The front aluminum plate and the back aluminum plate are tightly meshed at the mounting edge, so that the stability and the integrity of the substrate can be ensured.

In conclusion, the aluminum honeycomb core substrate is designed by adopting industry standard and advanced technology, and has excellent weather resistance, corrosion resistance and stability. Advanced processing technology and equipment are adopted in the manufacturing process, so that the flatness and the precision of the substrate can be ensured. Such a design may improve the reliability and durability of the projection substrate 2, thereby improving the overall performance and lifetime of the laser television.

The following specifically discusses the installation and transportation process:

for example, in this embodiment, two projection substrates 2 are used, where during transportation, as shown in fig. 8, due to the soft nature of the reflective flexible membrane 1, the two projection substrates 2 can be folded in half directly, reducing the area to one half of the original size.

After the two projection substrates 2 are unfolded after being transported to the designated positions, the fixing blocks 33 and the adjusting blocks 32 are respectively fixed on the corresponding projection substrates 2 by screws,

then the U-shaped housing 311 is relatively moved along the assembling track, so that the U-shaped housing 311 is assembled on the fixed block 33 and the adjusting block 32 in a sliding manner, and then the U-shaped housing 311 and the assembling block 312 can be fixed together by passing a screw through the assembling block 312 and the screw connecting part 3111;

meanwhile, the fixing bolt 35 passes through the second abdication hole 3122 to realize the connection with the fixing block 33; the adjusting bolt 34 passes through the first abdicating hole 3121 and is in threaded connection with the adjusting block 32, and the adjusting block 32 can be moved along the direction of the adjusting cover 31 by rotating the adjusting bolt 34, so as to achieve the purpose of stretching and flattening the reflective flexible membrane 1.

In addition, in the specific embodiment, the upper end and the lower end of the folding screen are provided with decorative strips, so that the whole is more attractive.

The above embodiments are merely illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the design of the present utility model.

Claims (10)

1. A convenient transportation and the folding screen of projection that keeps level, its characterized in that: the device comprises a plurality of projection substrates, a reflective flexible membrane and a leveling adjustment device, wherein the projection substrates are arranged side by side, the reflective flexible membrane is attached to the surfaces of the projection substrates, an adjustment space is reserved between every two adjacent projection substrates, the leveling adjustment device is connected with the two adjacent projection substrates respectively, and the reflective flexible membrane between the two adjacent projection substrates is stretched and leveled through the leveling adjustment device.

2. A conveniently transported and kept flat projection folding screen according to claim 1, wherein: one or more leveling adjustment devices are arranged in each adjustment space, and the leveling adjustment devices are uniformly arranged along the length direction of the adjustment space.

3. A conveniently transported and kept flat projection folding screen according to claim 2, characterized in that: the leveling and adjusting device comprises an adjusting cover body, a fixed block, an adjusting block and an adjusting bolt, wherein the fixed block is fixed on a projection substrate, the adjusting block is fixed on an adjacent projection substrate, and the adjusting block is aligned with the fixed block, one end of the adjusting cover body is arranged on the fixed block and is fixedly connected with the fixed block through the fixed bolt, the other end of the adjusting cover body is arranged on the surface of the adjusting block, and the adjusting bolt sequentially penetrates through the adjusting cover body and the adjusting block; the adjusting block is enabled to move along the direction of the adjusting cover body by rotating the adjusting bolt, and the reflecting flexible membrane between the two projection substrates is stretched and flattened.

4. A conveniently transported and kept flat projection folding screen according to claim 3, characterized in that: the adjusting cover body comprises a U-shaped cover shell and assembling blocks assembled at two ends of the U-shaped cover shell, wherein screw connecting parts are arranged on two inner side walls of the U-shaped cover shell, and the two inner side walls are fixed by passing through the assembling blocks and the screw connecting parts through screws; and a first yielding hole for the passing of the adjusting bolt is formed on the surface of the assembling block close to the adjusting block, and a second yielding hole for the passing of the fixing bolt is formed on the surface of the assembling block close to the fixing block.

5. A conveniently transported and kept flat projection folding screen according to claim 4, wherein: the adjusting block has the same structure as the fixing block, wherein the adjusting block comprises a U-shaped base and connecting parts arranged on the surface of the U-shaped base, and two ends of the connecting parts are respectively provided with internal threads, wherein the connecting parts of the adjusting block are in threaded connection with adjusting bolts through the internal threads, the surface of the U-shaped base of the adjusting block is provided with a first connecting hole used for being connected with a projection substrate, and the surface of the U-shaped base of the fixing block is provided with a second connecting hole used for being connected with the projection substrate.

6. A conveniently transported and kept flat projection folding screen according to claim 5, wherein: the upper ends of the two side walls of the U-shaped base are outwards extended with first clamping pieces, a fitting track is formed between the first clamping pieces and the projection substrate, the lower ends of the two side walls of the U-shaped housing are inwards extended with second clamping pieces, and the second clamping pieces of the U-shaped housing are movably fitted in the fitting track.

7. A conveniently transported and kept flat projection folding screen according to claim 1, wherein: the back of the projection substrate is also provided with a plurality of wall hanging fittings.

8. A conveniently transported and kept flat projection folding screen according to claim 1, wherein: the reflective flexible membrane is a long Jiao Xianxing fresnel membrane/a long Jiao Yuanxing fresnel membrane/a long Jiao Yuanxing fresnel membrane/a short focal black grid membrane/a short Jiao Yuanxing fresnel membrane/a short Jiao Xianxing fresnel membrane/an optical white membrane.

9. A conveniently transported and kept flat projection folding screen according to claim 1, wherein: the projection substrate comprises an aluminum honeycomb core substrate, a front aluminum plate and a back aluminum plate which are respectively arranged on the front side and the back side of the aluminum honeycomb core substrate, and the aluminum honeycomb core substrate adopts a hexagonal 3003 type aluminum honeycomb core.

10. A conveniently transported and kept flat projection folding screen according to claim 9, wherein: the surface of the back aluminum plate, which is far away from the aluminum honeycomb core substrate, is also provided with an iron sheet.