Projection device for stage display

Abstract

The invention relates to the technical field of projectors, in particular to a projection device for stage display, which comprises a main body component, a lens cover component and a cleaning component, the main body component comprises a projection component and a lens cover component matched with the projection component, the cleaning component is arranged in the lens cover component, and when the lens cover component corresponds to a lens of the projection component, the lens of the projection component can be cleaned by the cleaning component. Cleaning a lens of the projection assembly; the linkage part comprises a rotating assembly fixed to the lens cover assembly and a driving assembly arranged in the rotating assembly, the lens cover assembly can be driven to be located at the lens of the projection assembly through the linkage part, the cleaning assembly is driven to clean the lens through the driving assembly, and after cleaning is completed, the lens is cleaned through the cleaning assembly. The triggering part can drive the lens cover assembly to cover the lens of the projection assembly through the rotating assembly, so that cleaning and protection of the lens of the projection assembly are completed, convenience is improved, and the service life of the lens is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of projectors, in particular to a projection device for stage presentation. Background Art

[0002] A projector, also known as a projector, is a device that can project images or videos onto a screen. It can be connected to computers, VCDs, DVDs, game consoles or DVs through different interfaces. It is widely used in homes, light shows, cinemas and other places. The projector lens is an important working part of the projector.

[0003] When existing projection devices are used in public places, there are generally multiple projection devices, so they are generally only turned off when not in use, and the lens cover is not covered, resulting in the lens cover being always exposed to the outside, so that dust and other attachments will be contaminated on the lens, and the rain will corrode the lens, resulting in the service life of the lens and the clarity during use being greatly reduced, so improvement is needed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problem in the above or prior art that the lens of the projection device is exposed to the outside for a long time and is easily contaminated with dust, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a projection device for stage presentation.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a main body component, which includes a projection assembly, and a mirror cover assembly adapted for the projection assembly, and also includes a cleaning assembly arranged inside the mirror cover assembly, through which the lens of the projection assembly can be cleaned when the mirror cover assembly corresponds to the lens of the projection assembly; a linkage component, which includes a rotating component fixed on the mirror cover assembly, and a driving component arranged in the rotating component, the driving component is connected to the projection assembly and the cleaning component, the driving component can drive the rotating component to open and close the mirror cover assembly, and trigger the cleaning component to clean the projection assembly; a trigger component, which includes a track assembly fixed on the projection assembly, and a delay assembly fixed on the track assembly, and also includes an elastic component fixed on the track assembly, the delay assembly, the elastic component and the rotating assembly are connected, and the delay assembly can drive the mirror cover assembly to cover the lens of the projection assembly through the elastic component after the operation of the cleaning assembly is completed.

[0008] As a preferred solution of the projection device for stage display of the present invention, the projection assembly includes a projector, a receiving groove is provided inside one side of the projector, and a lens is provided at the front end of the projector and located on one side of the receiving groove.

[0009] As a preferred solution of the projection device for stage display of the present invention, the mirror cover assembly includes a cover shell, the cover shell is adapted to the lens, a ventilation groove is provided at the end of the cover shell, and a partition fixed at the opening of the cover shell, the partition is provided with an oblique groove, and also includes a piston sliding inside the cover shell.

[0010] As a preferred solution of the projection device for stage display of the present invention, the cleaning component includes a rotating rod arranged at the center of the partition, the outer wall of the rotating rod is provided with two spiral grooves opposite to each other, and a slider sliding in the spiral groove, the slider is connected to the piston, the rotating rod is located at the partition and has a groove, and also includes a support plate fixed to the rotating rod at one end of the partition, also includes a sponge fixed on the support plate, and also includes a glasses cloth fixed to the outer wall of the sponge.

[0011] As a preferred solution of the projection device for stage display of the present invention, wherein: the rotating assembly includes a support tube fixed on the mirror cover assembly, the outer wall of the support tube is provided with a rotation groove, the outer wall of the support tube is provided with an annular groove on the side away from the rotation groove, the outer wall of the support tube is provided with an inclined groove on the side away from the annular groove, and the support tube is provided with a sliding groove at the inclined groove.

[0012] As a preferred solution of the projection device for stage display of the present invention, the driving assembly includes a curved rod arranged on the inner wall of the supporting tube, the curved rod is connected to the piston, the long end of the curved rod is provided with a movable groove, and a connecting rod sliding in the movable groove, and also includes a sliding rod fixed on the connecting rod, the sliding rod is adapted to the inclined groove and the sliding groove, and also includes a telescopic rod fixed to the end of the connecting rod.

[0013] As a preferred solution of the projection device for stage display of the present invention, the track assembly includes a fixed plate fixed inside the projection assembly, and a movable plate sliding on the top of the fixed plate, and also includes a force ring fixed on the top of the movable plate, and the force ring is adapted to the rotating assembly.

[0014] As a preferred solution of the projection device for stage display of the present invention, the delay assembly includes a bracket fixed to the top of the fixed plate, and a bevel plate rotating on the top of the bracket, a No. 1 spring fixed to the top of the bevel plate, a No. 1 triangle block fixed to the bottom of the bevel plate, a trigger plate fixed to the top of the fixed plate corresponding to the side of the bracket, a movable ring sliding on the top of the movable plate, and a No. 2 triangle block fixed to the top of the movable ring.

[0015] As a preferred solution of the projection device for stage display of the present invention, the elastic component includes a No. 1 ring fixed to the center of the top of the movable plate, and a No. 2 spring fixed to the end of the No. 1 ring corresponding to one end of the movable ring, and also includes a No. 2 ring fixed to the end of the No. 2 spring.

[0016] The beneficial effects of the projection device for stage display of the present invention are as follows: the present invention can drive the mirror cover assembly to be located at the lens of the projection assembly through the linkage component, and drive the cleaning component to clean the lens through the driving component. After the cleaning is completed, the trigger component can drive the mirror cover assembly to cover the lens of the projection assembly through the rotating component, thereby completing the cleaning and protection of the lens of the projection assembly, improving the convenience and the service life of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is an overall schematic diagram of a projection device for stage presentation.

[0019] Figure 2This is a schematic diagram of the open state of the mirror cover assembly of the projection device used for stage presentation.

[0020] Figure 3 A schematic diagram of the internal structure of a projection device used for stage presentations.

[0021] Figure 4 This is a schematic diagram of the internal structure of a mirror cover assembly of a projection device for stage presentation in an open state.

[0022] Figure 5 It is a schematic diagram of the structure of the main components of a projection device used for stage presentation.

[0023] Figure 6 The figure is a schematic diagram of the structure of a mirror cover assembly in a projection device used for stage presentation.

[0024] Figure 7 The figure is a schematic diagram of the structure of a cleaning component in a projection device for stage presentation.

[0025] Figure 8 The figure is a schematic diagram of the structure of linkage components in a projection device used for stage presentation.

[0026] Fig. 9 The figure is a schematic diagram of the structure of a rotating component in a projection device used for stage presentation.

[0027] Fig.10 The figure is a schematic diagram of the structure of a driving component in a projection device used for stage presentation.

[0028] Fig.11 The figure is a schematic diagram of the structure of the triggering components in the projection device used for stage presentation.

[0029] Fig.12 The diagram is a schematic diagram of the structure of a track component and an elastic component in a projection device for stage presentation.

[0030] In the figure: 100, main body component; 101, projection assembly; 102, mirror cover assembly; 103, cleaning assembly; 101a, projector; 101b, receiving slot; 101c, lens; 102a, cover shell; 102b, ventilation slot; 102c, partition; 102d, oblique slot; 102e, piston; 103a, rotating rod; 103b, spiral groove; 103c, slider; 103d, groove; 103e, support plate; 103f, sponge; 103g, glasses cloth; 200, linkage component; 201, rotating component; 202, driving component; 201a, support tube; 201b, rotating groove; 201c, annular groove; 201d, inclined groove; 201e, slide groove; 202a, curved rod; 202b, movable slot; 202c, connecting rod; 202d, sliding rod; 202e, telescopic rod; 300, trigger component; 301, track component; 302, delay component; 303, elastic component; 301a, fixed plate; 301b, movable plate; 301c, force ring; 302a, bracket; 302b, inclined head plate; 302c, spring No. 1; 302d, triangle block No. 1; 302e, trigger plate; 302f, moving ring; 302g, triangle block No. 2; 303a, ring No. 1; 303b, spring No. 2; 303c, ring No. 2. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1, reference Figure 1 to Figure 7 , which is the first embodiment of the present invention, provides a projection device for stage display, which can achieve the effect of cleaning the lens of the projection device, and includes a main body component 100, which includes a projection component 101, and a mirror cover component 102 adapted to the projection component 101, and also includes a cleaning component 103 arranged inside the mirror cover component 102, through which the lens of the projection component 101 can be cleaned when the mirror cover component 102 corresponds to the lens of the projection component 101; The linkage component 200 includes a rotating component 201 fixed to the mirror cover component 102, and a driving component 202 disposed in the rotating component 201. The driving component 202 is connected to the projection component 101 and the cleaning component 103. The driving component 202 can drive the rotating component 201 to open and close the mirror cover component 102, and trigger the cleaning component 103 to clean the projection component 101. The trigger component 300 includes a track component 301 fixed on the projection component 101, a delay component 302 fixed on the track component 301, and an elastic component 303 fixed on the track component 301. The delay component 302, the elastic component 303 and the rotating component 201 are connected. After the operation of the cleaning component 103 is completed, the delay component 302 can drive the mirror cover component 102 to cover the lens of the projection component 101 through the elastic component 303.

[0035] Specifically, Figure 5 In the embodiment, the projection assembly 101 includes a projector 101a, a receiving groove 101b is provided inside one side of the projector 101a, and a lens 101c is provided at the front end of the projector 101a and located at one side of the receiving groove 101b.

[0036] Further, such as Figure 6 In the invention, the lens cover assembly 102 includes a cover shell 102a, the cover shell 102a and the lens 101c are matched, the inner diameter of the inner wall of the cover shell 102a is matched with the outer wall diameter of the lens 101c, a ventilation groove 102b is provided at the end of the cover shell 102a, and there are multiple ventilation grooves 102b, and the multiple ventilation grooves 102b are arranged in a ring shape at the end of the cover shell 102a, and a partition 102c is fixed at the opening of the cover shell 102a, and there are oblique grooves 102d on the partition 102c, and there are multiple oblique grooves 102d, and the multiple oblique grooves 102d are arranged in a ring shape on the partition 102c, and also includes a piston 102e that slides inside the cover shell 102a.

[0037] Further, such as Figure 7 In the figure, the cleaning component 103 includes a rotating rod 103a arranged at the center of the partition 102c, two spiral grooves 103b are arranged on the outer wall of the rotating rod 103a, and a slider 103c slides in the spiral groove 103b, the slider 103c is connected to the piston 102e, and one end of the outer side of the two sliders 103c is fixedly connected to the inner wall of the piston 102e, the rotating rod 103a is located at the partition 102c and has a groove 103d, the groove 103d allows the rotating rod 103a to move and rotate at the center of the partition 102c, and also includes a support plate 103e fixed to the rotating rod 103a at one end of the partition 102c, and also includes a sponge 103f fixed on the support plate 103e, and the end of the sponge 103f away from the support plate 103e is arc-shaped, and also includes a glasses cloth 103g fixed to the outer wall of the sponge 103f.

[0038] When in use, when the opening of the cover shell 102a is located at the lens 101c and does not fit the lens 101c, the driving assembly 202 applies pressure to the piston 102e, so that the piston 102e, the slider 103c, the rotating rod 103a, the support plate 103e, the sponge 103f and the glasses cloth 103g move toward the lens 101c. When the glasses cloth 103g fits the lens 101c, the groove 103d on the rotating rod 103a will contact the partition 102c. At this time, the thrust of the driving assembly 202 can drive the piston 102e to move, so that the piston 102e squeezes the cover shell 102a and the partition 102c. The gas between the two surfaces is blown toward the lens 101c at an oblique angle through the oblique groove 102d. At the same time, when the piston 102e moves, the slider 103c is driven to move. The slider 103c moves in the spiral groove 103b, which can drive the rotating rod 103a to rotate. The rotating rod 103a can drive the supporting plate 103e, the sponge 103f and the glasses cloth 103g to rotate. At this time, the glasses cloth 103g can be attached to the lens 101c for cleaning due to the slight squeezing force of the sponge 103f. The glasses cloth 103g can clean the dust on the lens 101c, and then clean it again through wind power, completing the efficient cleaning process of the lens.

[0039] In summary, the linkage component 200 can drive the mirror cover assembly 102 to be located at the lens of the projection assembly 101, and the driving component 202 can drive the cleaning component 103 to clean the lens. After the cleaning is completed, the trigger component 300 can drive the mirror cover assembly 102 to cover the lens of the projection assembly 101 through the rotating component 201, thereby completing the cleaning and protection of the lens of the projection assembly 101, improving the convenience and service life of the lens.

[0040] Example 2, reference Figures 1 to 12 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a linkage component 200 and a trigger component 300 of a projection device for stage display, solving the problem of automatically opening and closing the lens cover, such as Fig. 9 In it, the rotating component 201 includes a support tube 201a fixed on the mirror cover component 102, the support tube 201a is connected to the outer wall of the cover shell 102a in the mirror cover component 102, the outer wall of the support tube 201a is provided with a rotation groove 201b, the outer wall of the support tube 201a is provided with an annular groove 201c on the side away from the rotation groove 201b, the outer wall of the support tube 201a is provided with an inclined groove 201d on the side away from the annular groove 201c, the rotation range of the inclined groove 201d is one-quarter circle, the inclined groove 201d has two, the two inclined grooves 201d are arranged opposite to each other on the support tube 201a, the support tube 201a is provided with a slide groove 201e at the inclined groove 201d, the slide groove 201e has two, and the two slide grooves 201e are communicated with the corresponding two inclined grooves 201d.

[0041] Specifically, Fig.10 In the figure, the driving assembly 202 includes a curved rod 202a arranged on the inner wall of the support tube 201a, the curved rod 202a is connected to the piston 102e, the long end of the curved rod 202a is provided with a movable groove 202b, and a connecting rod 202c sliding in the movable groove 202b, and also includes a sliding rod 202d fixed on the connecting rod 202c, the sliding rod 202d is adapted to the inclined groove 201d and the sliding groove 201e, the length of the sliding rod 202d is greater than the inclined groove 201d and the sliding groove 201e, and also includes a telescopic rod 202e fixed to the end of the connecting rod 202c, and the base of the telescopic rod 202e is fixed in the accommodating groove 101b.

[0042] Further, such as Fig.11 , 12 In the figure, the track assembly 301 includes a fixed plate 301a fixed inside the projection assembly 101, the fixed plate 301a is located in the accommodating groove 101b in the projection assembly 101, and a movable plate 301b slides on the top of the fixed plate 301a, and also includes a force ring 301c fixed on the top of the movable plate 301b, the force ring 301c is adapted to the rotating assembly 201, the inner diameter of the inner wall of the force ring 301c is the same as the outer wall diameter of the support tube 201a in the rotating assembly 201, and the force ring 301c is located at the outer wall of the support tube 201a corresponding to the slide groove 201e.

[0043] Specifically, Fig.11 In the figure, the delay component 302 includes a bracket 302a fixed on the top of the fixed plate 301a, and a bevel plate 302b rotating on the top of the bracket 302a, the end of the bevel plate 302b is an inclined surface, and also includes a No. 1 spring 302c fixed on the top of the bevel plate 302b, and also includes a No. 1 triangle block 302d fixed on the bottom of the bevel plate 302b, and also includes a trigger plate 302e fixed on the top of the fixed plate 301a corresponding to the side of the bracket 302a, the top of the trigger plate 302e has an inclined surface, which is compatible with the inclined surface of the bevel plate 302b, and also includes a moving ring 302f sliding on the top of the moving plate 301b, the moving ring 302f is located in the rotating groove 201b, and also includes a No. 2 triangle block 302g fixed on the top of the moving ring 302f, and the inclined surfaces of the No. 1 triangle block 302d and the No. 2 triangle block 302g are opposite.

[0044] Further, such as Fig.12 In the figure, the elastic component 303 includes a No. 1 ring 303a fixed at the center of the top of the movable plate 301b, the No. 1 ring 303a moves inside the annular groove 201c, and a No. 2 spring 303b fixed to the end of the No. 1 ring 303a corresponding to one end of the movable ring 302f, and also includes a No. 2 ring 303c fixed to the end of the No. 2 spring 303b, and the No. 2 ring 303c rotates inside the annular groove 201c corresponding to one end of the rotating groove 201b.

[0045] The rest of the structure is the same as that of Example 1.

[0046] When in use, by closing the projector 101a, by starting the retracting function of the telescopic rod 202e, the driving end of the telescopic rod 202e pulls the connecting rod 202c and the sliding rod 202d. At this time, the connecting rod 202c slides in the movable groove 202b, so it will not drive the curved rod 202a, but the sliding rod 202d will slide from the inclined groove 201d to the entry end of the sliding groove 201e, so that the support tube 201a rotates a quarter of a circle, so that the support tube 201a can drive the mirror cover assembly 102 to rotate to the lens 101c. At this time, the mirror cover assembly 102 can drive the curved rod 20 2a rotates synchronously, at this time, the driving end of the telescopic rod 202e continues to pull the connecting rod 202c, and the connecting rod 202c will resist the movable groove 202b, so that the connecting rod 202c can drive the bent rod 202a to move, and the bent rod 202a can drive the piston 102e to trigger the cleaning component 103, and at the same time the connecting rod 202c will drive the sliding rod 202d to move, and the sliding rod 202d will resist the force ring 301c to move, and the force ring 301c will drive the moving plate 301b and the first ring 303a to move, and the first ring 303a will pull the second spring 303b, so that the second spring The spring 303b forms a pulling force on the No. 2 ring 303c and the support tube 201a, and the moving plate 301b can drive the trigger plate 302e to approach the inclined head plate 302b. When the slide rod 202d moves to the end of the slide groove 201e, the step of the bent rod 202a triggering the cleaning component 103 is completed. At this time, the moving plate 301b can drive the top inclined surface of the trigger plate 302e to contact the end inclined surface of the inclined head plate 302b, and then the trigger plate 302e will lift the inclined head plate 302b, and the inclined head plate 302b will squeeze the No. 1 spring 302c, and the inclined head plate 302b will drive the No. 1 The triangular block 302d is disengaged from the limit of the second triangular block 302g. At this time, the movable ring 302f and the support tube 201a connected to the second triangular block 302g are released from the limit. At this time, the reset elastic force of the second spring 303b pulls the second ring 303c, the support tube 201a, and the cover shell 102a to move. The cover shell 102a will cover the lens 101c, and the cleaning component 103 can be triggered. After cleaning, the lens 101c can be covered. When the projector 101a is turned on, the extension function of the telescopic rod 202e is started, and the reset operation can be performed according to the above function.

[0047] In summary, by covering the lens 101c of the projection device, a certain distance is created between the cover shell 102a and the lens 101c, so that the cleaning assembly 103 can clean the lens and discharge the dust after cleaning. After cleaning, the trigger component 300 and the rotating assembly 201 can drive the lens cover assembly 102 to cover the lens 101c, thereby completing the protection of the lens. Furthermore, by starting the telescopic rod 202e when the projector 101a is turned on or off, the lens 101c can be automatically covered when the projector 101a is not in use.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A projection device for stage presentation, characterized in that: include, A main body component (100), comprising a projection assembly (101), and a mirror cover assembly (102) adapted to the projection assembly (101), and further comprising a cleaning assembly (103) disposed inside the mirror cover assembly (102), wherein the cleaning assembly (103) can clean the lens of the projection assembly (101) when the mirror cover assembly (102) corresponds to the lens of the projection assembly (101); A linkage component (200), comprising a rotating component (201) fixed to the mirror cover component (102), and a driving component (202) disposed in the rotating component (201), wherein the driving component (202) is connected to the projection component (101) and the cleaning component (103), and the driving component (202) can drive the rotating component (201) to open and close the mirror cover component (102), and trigger the cleaning component (103) to clean the projection component (101); The trigger component (300) comprises a track component (301) fixed on the projection component (101), and a delay component (302) fixed on the track component (301), and also comprises an elastic component (303) fixed on the track component (301), wherein the delay component (302), the elastic component (303) and the rotating component (201) are connected, and after the operation of the cleaning component (103) is completed, the delay component (302) can drive the mirror cover component (102) to cover the lens of the projection component (101) through the elastic component (303).

2. The projection device for stage presentation according to claim 1, characterized in that: The projection assembly (101) comprises a projector (101a), a receiving groove (101b) is provided inside one side of the projector (101a), and a lens (101c) is provided at the front end of the projector (101a) and located on one side of the receiving groove (101b).

3. The projection device for stage presentation according to claim 2, characterized in that: The lens cover assembly (102) comprises a cover shell (102a), the cover shell (102a) and the lens (101c) are matched, a ventilation groove (102b) is provided at the end of the cover shell (102a), and a partition (102c) fixed at the opening of the cover shell (102a), the partition (102c) is provided with an oblique groove (102d), and also comprises a piston (102e) that slides inside the cover shell (102a).

4. The projection device for stage presentation according to claim 3, characterized in that: The cleaning assembly (103) comprises a rotating rod (103a) arranged at the center of the partition (102c), the outer wall of the rotating rod (103a) being provided with two spiral grooves (103b) facing each other, and a slider (103c) sliding in the spiral groove (103b), the slider (103c) being connected to the piston (102e), the rotating rod (103a) being provided with a groove (103d) at the partition (102c), and further comprising a support plate (103e) fixed to one end of the rotating rod (103a) at the partition (102c), a sponge (103f) fixed to the support plate (103e), and a glasses cloth (103g) fixed to the outer wall of the sponge (103f).

5. The projection device for stage presentation according to claim 1, characterized in that: The rotating assembly (201) comprises a supporting tube (201a) fixed on the mirror cover assembly (102); a rotating groove (201b) is provided on an outer wall of the supporting tube (201a); an annular groove (201c) is provided on a side of the outer wall of the supporting tube (201a) away from the rotating groove (201b); an inclined groove (201d) is provided on a side of the outer wall of the supporting tube (201a) away from the annular groove (201c); and a sliding groove (201e) is provided on the supporting tube (201a) at the inclined groove (201d).

6. The projection device for stage presentation according to claim 5, characterized in that: The driving assembly (202) comprises a curved rod (202a) arranged on the inner wall of the supporting tube (201a), the curved rod (202a) being connected to the piston (102e), a movable groove (202b) being provided at the long end of the curved rod (202a), and a connecting rod (202c) sliding in the movable groove (202b), and further comprising a sliding rod (202d) fixed on the connecting rod (202c), the sliding rod (202d) being adapted to the inclined groove (201d) and the sliding groove (201e), and further comprising a telescopic rod (202e) fixed to the end of the connecting rod (202c).

7. The projection device for stage presentation according to claim 1, characterized in that: The track assembly (301) comprises a fixed plate (301a) fixed inside the projection assembly (101), and a movable plate (301b) sliding on the top of the fixed plate (301a), and also comprises a force ring (301c) fixed on the top of the movable plate (301b), wherein the force ring (301c) is adapted to the rotation assembly (201).

8. The projection device for stage presentation according to claim 7, characterized in that: The delay assembly (302) includes a bracket (302a) fixed to the top of the fixed plate (301a), and a bevel plate (302b) rotating on the top of the bracket (302a), and also includes a No. 1 spring (302c) fixed to the top of the bevel plate (302b), and also includes a No. 1 triangular block (302d) fixed to the bottom of the bevel plate (302b), and also includes a trigger plate (302e) fixed to the top of the fixed plate (301a) corresponding to the side of the bracket (302a), and also includes a moving ring (302f) sliding on the top of the moving plate (301b), and also includes a No. 2 triangular block (302g) fixed to the top of the moving ring (302f).

9. The projection device for stage presentation according to claim 8, characterized in that: The elastic component (303) comprises a No. 1 ring (303a) fixed at the center of the top of the movable plate (301b), a No. 2 spring (303b) fixed at the end of the No. 1 ring (303a) corresponding to one end of the movable ring (302f), and a No. 2 ring (303c) fixed at the end of the No. 2 spring (303b).

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