Projection device

Abstract

The utility model provides projection equipment. The projection equipment comprises a base; the projection plate is vertically arranged on the base; the projection assembly is arranged on the base, the projection assembly comprises a projection part, the projection assembly has a projection state and an avoiding state which are oppositely arranged, when the projection assembly is in the projection state, the projection part is far away from the projection plate to project on the projection plate, and when the projection assembly is in the avoiding state, the projection part is attached to the projection plate; the driving part is arranged on the base, the driving part is in driving connection with the projection assembly, and the driving part drives the projection part to be close to or away from the projection plate so that the projection assembly can be switched between the projection state and the avoiding state. According to the technical scheme provided by the utility model, the problem that the projection equipment in the prior art is inconvenient to move due to large occupied space can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal mine accident rescue, and more specifically, to a projection device. Background Art

[0002] A coal mine is a reasonable space excavated by humans when mining a geological layer rich in coal, usually including roadways, shafts and working faces, etc.

[0003] In the prior art, accidents may occur due to collapse during the coal mine excavation process. In order to facilitate rescue personnel to master the underground terrain, a projection device is needed to project and display images. However, the structure of the existing projection device is relatively simple. In order to ensure the projection angle of the projection device, the projection device needs to occupy a large amount of space, which is not convenient for users to move the projection device. Summary of the Utility Model

[0004] The utility model provides a projection device to solve the problem that the existing projection device occupies a large amount of space and is not convenient to move.

[0005] The utility model provides a projection device, which includes: a base; a projection board vertically arranged on the base; a projection component arranged on the base, the projection component includes a projection part, the projection component has a projection state and an avoidance state arranged oppositely. When the projection component is in the projection state, the projection part is far away from the projection board to project on the projection board. When the projection component is in the avoidance state, the projection part is attached to the projection board; a driving part, the driving part is arranged on the base, the driving part is drivingly connected with the projection component, and the driving part drives the projection part to approach or move away from the projection board so that the projection component switches between the projection state and the avoidance state.

[0006] Furthermore, the projection component further includes a rotating board, one end of the rotating board is rotatably arranged on the base, the driving part is drivingly connected with the rotating board to drive the rotating board to rotate, and the other end of the rotating board is rotatably connected with the projection part.

[0007] Furthermore, the projection device further includes a transmission component, the transmission component is arranged on the base and located between the driving part and the rotating board, the transmission component is drivingly connected with the driving part, and the driving part drives the projection component to switch between the projection state and the avoidance state through the transmission component.

[0008] Further, the transmission assembly includes: a screw rod rotatably arranged on the base, the screw rod extending in the horizontal direction, and a driving member for driving the screw rod to rotate; a screw sleeve sleeved on the screw rod, the screw sleeve being threadedly connected to the screw rod, a support member being arranged on the screw sleeve, the support member being located on the side of the rotating plate away from the projection plate and abutting against the projection plate, when the screw sleeve moves on the screw rod, the rotating plate is driven by the support member to approach the projection plate, so as to realize the switching of the projection assembly from the projection state to the avoidance state; a rotation stopping portion arranged between the screw sleeve and the base, the rotation stopping portion being used for restricting the screw sleeve from rotating relative to the screw rod.

[0009] Further, the transmission assembly further includes a rotation stopping rod, the axis direction of the rotation stopping rod being parallel to the axis direction of the screw rod, the screw sleeve being sleeved on the rotation stopping rod to restrict the screw sleeve from rotating relative to the screw rod, and the rotation stopping rod forming the rotation stopping portion.

[0010] Further, the projection device further includes an angle adjusting member connected to the projection portion, the angle adjusting member being capable of adjusting the rotation angle of the projection portion, the projection portion having a projection position and a storage position arranged oppositely, when the projection portion is in the projection position, there is an included angle between the extending direction of the projection portion and the rotating plate, and the projection direction of the projection portion faces the projection plate, at this time the projection assembly is in the projection state; when the projection portion is in the storage position, the extending direction of the projection portion rotates to be the same as the extending direction of the rotating plate, and at this time the projection assembly is in the avoidance state.

[0011] Further, a support rod is arranged on the base, the projection plate is arranged on the support rod, and the angle adjusting member includes: an elastic plate, one end of the elastic plate being fixedly connected to the side of the rotating plate facing the projection plate, the other end of the elastic plate abutting against the projection portion; a support rod arranged on the support rod; a traction rope wound around the support rod, one end of the traction rope being fixedly connected to the top of the screw sleeve, and the other end of the traction rope passing through the rotating plate and being connected to the projection portion; wherein, when the projection assembly is in the projection state, the traction rope is tightened to drive the projection portion to abut against the elastic plate, causing the elastic plate to bend, and at this time the projection portion is in the projection position; when the projection assembly is in the avoidance state, the screw sleeve moves in the direction towards the projection plate, the traction rope is unloaded, the elastic plate returns to be straight and drives the projection portion to rotate to be the same as the extending direction of the rotating plate, and at this time the projection portion is in the storage position.

[0012] Further, a first connection ring is arranged at one end of the rotating plate away from the projection plate, a rotating shaft is arranged at the bottom of the projection portion, the rotating shaft is sleeved in the first connection ring, and the rotating shaft is rotatably connected to the first connection ring.

[0013] Further, a plurality of rollers are arranged at the bottom of the base, and the rollers are used for driving the projection device to move in the horizontal direction.

[0014] Further, a buffer pad is arranged on the side of the projection plate facing the projection assembly, the buffer pad corresponding to the projection portion is arranged to buffer the impact force generated on the projection plate when the projection portion switches to the avoidance position.

[0015] Applying the technical solution of the present utility model, the projection assembly has a projection state and an avoidance state arranged oppositely. When the projection assembly is in the projection state, the projection part is far away from the projection plate to project on the projection plate. When the projection assembly is in the avoidance state, the projection part is attached to the projection plate. In this way, when the projection device needs to be moved and transported, the projection assembly can be switched to the avoidance state, which can reduce the overall space volume of the projection device, and avoid the projection part from colliding with and interfering with external devices or personnel during movement, and also does not affect the projection effect of the projection part during projection. And the projection device further includes a driving member, which can drive the projection assembly to switch between the projection state and the avoidance state, making the operation of the projection device more convenient, saving manpower, and at the same time improving the accuracy and timeliness of the switching between different states of the projection assembly. Description of the Drawings

[0016] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 shows a schematic structural diagram of the projection device provided by the present utility model;

[0018] Figure 2 shows a partial structural diagram of the projection device provided by the present utility model;

[0019] Figure 3 shows a schematic structural diagram of the rotating plate provided by the present utility model.

[0020] Among them, the above-mentioned accompanying drawings include the following reference numerals:

[0021] 10, base;

[0022] 11, support rod;

[0023] 12, roller; 13, support;

[0024] 20, projection plate;

[0025] 30, projection assembly;

[0026] 31, projection part; 311, rotating shaft;

[0027] 32, rotating plate;

[0028] 321, first connecting ring; 322, second connecting ring;

[0029] 40, driving member;

[0030] 50. Transmission assembly; 51. Screw rod;

[0031] 52. Nut sleeve; 53. Support member;

[0032] 54. Anti-rotation rod;

[0033] 61. Elastic plate; 62. Support rod; 63. Towing rope;

[0034] 70. Buffer pad. Detailed implementation mode

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation to the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0036] As Figures 1 to 3 shown, an embodiment of the present invention provides a projection device, which includes: a base 10, a projection plate 20, a projection assembly 30, and a driving member 40. Among them, the projection plate 20 is vertically arranged on the base 10. The projection assembly 30 is arranged on the base 10. The projection assembly 30 includes a projection part 31. The projection assembly 30 has a projection state and an avoidance state arranged oppositely. When the projection assembly 30 is in the projection state, the projection part 31 is far away from the projection plate 20 to project on the projection plate 20. When the projection assembly 30 is in the avoidance state, the projection part 31 is attached to the projection plate 20. The driving member 40 is arranged on the base 10. The driving member 40 is drivingly connected to the projection assembly 30. The driving member 40 drives the projection part 31 to approach or move away from the projection plate 20, so that the projection assembly 30 switches between the projection state and the avoidance state. Arranging the driving member 40 on the base 10 can avoid the large space volume of the projection assembly 30 caused by arranging the driving member 40 on the projection assembly 30, and at the same time, it can also reduce the possibility of interference between the driving member 40 and the projection assembly 30.

[0037] Applying the technical solution of the present utility model, the projection assembly 30 has a relatively set projection state and an avoidance state. When the projection assembly 30 is in the projection state, the projection part 31 is away from the projection plate to project on the projection plate 20. When the projection assembly 30 is in the avoidance state, the projection part 31 is attached to the projection plate 20. In this way, when the projection device needs to be moved and transported, the projection assembly 30 can be switched to the avoidance state, which can reduce the overall space volume of the projection device and avoid the projection part 31 from colliding with and interfering with external devices or personnel during movement, and also will not affect the projection effect of the projection part 31 during projection. And the projection device further includes a driving member 40, and the driving member 40 can drive the projection assembly 30 to switch between the projection state and the avoidance state, which makes the operation of the projection device more convenient, saves manpower, and at the same time improves the accuracy and timeliness of the switching between different states of the projection assembly 30.

[0038] Among them, the specific structure of the driving member 40 and the connection manner between the projection part 31 and the base 10 are not limited. The driving member 40 can be set as a driving motor, a hydraulic cylinder or a turntable. The projection part 31 can be rotatably connected or telescopically connected to the base 10, as long as it can realize the driving member. In this embodiment, the driving member 40 is a turntable, a hand crank is arranged on the turntable, and the output shaft of the turntable is fixedly connected to the screw rod 51. Such a setting has a simple structure, is convenient to operate, and does not occupy too much space.

[0039] As Figure 2 shown, the projection assembly 30 further includes a rotating plate 32. One end of the rotating plate 32 is rotatably arranged on the base 10, and the driving member 40 is drivingly connected to the rotating plate 32 to drive the rotating plate 32 to rotate. The other end of the rotating plate 32 is rotatably connected to the projection part 31. The above setting makes the movable connection manner between the projection part 31 and the base 10 simpler and more convenient, facilitating the operator to observe in real time and operate in a timely manner. And through the structure of the plate, the stability and reliability of the rotation between the projection part 31 and the base 10 can be increased, and the possibility of the rotating plate 32 breaking during the rotation of the projection part 31 can be reduced to ensure the normal operation of the projection part 31.

[0040] Specifically, a pin shaft is further arranged on the base 10. One end of the rotating plate 32 has a second connecting ring 322. The rotating plate 32 is rotatably connected to the base 10 by the pin shaft passing through the second connecting ring 322. The structure is simple and convenient for installation.

[0041] As Figure 2As shown in the figure, the projection device further includes a transmission assembly 50. The transmission assembly 50 is disposed on the base 10 and located between the driving member 40 and the rotating plate 32. The transmission assembly 50 is drivingly connected to the driving member 40, and the driving member 40 drives the projection assembly 30 to switch between the projection state and the avoidance state through the transmission assembly 50. By providing the transmission assembly 50, not only can the transmission speed be selected according to the structure of the transmission assembly 50, but also the direction of the force of the driving member 40 can be changed. Furthermore, the cooperation positions and cooperation methods between the components can be changed, so that the layout positions of the components are more reasonable, and the space utilization rate of the projection device is improved.

[0042] In this embodiment, the specific structure of the transmission assembly 50 is not limited. In some embodiments, the transmission assembly 50 can be set as a meshing transmission mode of a gear and a rack. In other embodiments, the transmission assembly 50 can also be set as a meshing transmission mode of a worm and a worm gear.

[0043] Among them, the transmission assembly 50 includes: a screw rod 51, a nut sleeve 52 and a rotation prevention portion. Among them, the screw rod 51 is rotatably disposed on the base 10. The screw rod 51 extends in the horizontal direction, and the driving member 40 drives the screw rod 51 to rotate. The nut sleeve 52 is sleeved on the screw rod 51. The nut sleeve 52 is threadedly connected to the screw rod 51. A support member 53 is disposed on the nut sleeve 52. The support member 53 is located on the side of the rotating plate 32 away from the projection plate 20 and abuts against the projection plate 20. When the nut sleeve 52 moves on the screw rod 51, the rotating plate 32 is driven by the support member 53 to approach the projection plate 20, so as to realize the switching of the projection assembly 30 from the projection state to the avoidance state; the rotation prevention portion is disposed between the nut sleeve 52 and the base 10, and the rotation prevention portion is used to limit the relative rotation of the nut sleeve 52 with respect to the screw rod 51. Through the threaded cooperation between the screw rod 51 and the nut sleeve 52, it is convenient to adjust and control the moving distance of the nut sleeve 52. In this way, the distance between the projection portion 31 and the projection plate 20 can also be adjusted to adjust the projection effect. At the same time, the threaded cooperation can also lock the position of the nut sleeve 52 to prevent the nut sleeve 52 from moving automatically after being adjusted to the appropriate position, and ensure the stability of the operation of the transmission assembly.

[0044] Specifically, when the projection assembly 30 is in the projection state, the projection portion 31 will protrude from the base 10 to facilitate projecting the image on the projection plate 20. When it is necessary to move the projection device after the screening is completed, at this time, the driving member 40 is rotated to drive the screw rod 51 to rotate. When the screw rod 51 rotates, it will drive the nut sleeve 52 to rotate. However, due to the existence of the rotation prevention portion, the nut sleeve 52 can be prevented from rotating along with the screw rod 51. Therefore, the nut sleeve 52 will move relatively along the extension direction of the screw rod 51 and toward the projection plate 20. At this time, the nut sleeve 52 abuts against the rotating plate 32 and drives the nut sleeve 52 to rotate relative to the base 10 and toward the projection plate 20, thereby driving the projection portion 31 to approach the rotating plate 32 and fit with the rotating plate 32, so that the projection assembly 30 is switched to the avoidance state.

[0045] Among them, the specific structure of the rotation prevention part is not limited, as long as the relative rotation of the screw sleeve 52 relative to the screw rod 51 can be avoided. The rotation prevention part can be set as a guide cylinder having the same extending direction as the screw rod 51. The guide cylinder is provided with guide protrusions therein, and the screw sleeve 52 is provided with guide grooves. The extending direction of the guide protrusions is the same as that of the guide cylinder. In this way, the relative rotation of the screw sleeve 52 relative to the screw rod 51 is avoided through the cooperation of the guide protrusions and the guide grooves, so that the screw sleeve 52 moves relative to the screw rod 51 along the extending direction of the screw rod 51.

[0046] Specifically, two supports 13 and two bearing assemblies are further provided on the base 10. The two bearing assemblies are respectively arranged on the two supports 13, and both ends of the screw rod 51 are respectively passed through the two sets of bearing assemblies to realize the rotation of the screw rod 51.

[0047] Such as Figure 2 As shown, the transmission assembly 50 further includes a rotation prevention rod 54. The axial direction of the rotation prevention rod 54 is arranged parallel to the axial direction of the screw rod 51. The screw sleeve 52 is passed through the rotation prevention rod 54 to limit the relative rotation of the screw sleeve 52 relative to the screw rod 51, and the rotation prevention rod 54 forms the rotation prevention part. Among them, both ends of the rotation prevention rod 54 are respectively fixed on the two supports 13 and are arranged below the screw rod 51, so that interference between the rotation prevention rod 54 and other components can be avoided.

[0048] Furthermore, the projection device further includes an angle adjustment member. The angle adjustment member is connected to the projection part 31. The angle adjustment member can adjust the rotation angle of the projection part 31. The projection part 31 has a projection position and a storage position which are oppositely arranged. When the projection part 31 is in the projection position, there is an included angle between the extending direction of the projection part 31 and the rotating plate 32, and the projection direction of the projection part 31 faces the projection plate 20. Among them, the projection part 31 is a projector, and the projection part 31 has a lens. The projection direction is the extending direction of the lens. At this time, the projection assembly 30 is in the projection state. When the projection part 31 is in the storage position, the extending direction of the projection part 31 rotates to be the same as the extending direction of the rotating plate 32. At this time, the projection assembly 30 is in the avoidance state. Such a setting can improve the flexibility of the projection of the projection device. Such a setting enables the projection part 31 to be switched to the storage position when the projection assembly 30 is in the avoidance state, which can further reduce the lateral space volume when the projection assembly 30 is in the avoidance state and can further reduce the possibility of interference between the projection part 31 and the outside.

[0049] In this embodiment, the specific form of the angle adjuster is not limited, as long as the rotation angle of the projection part 31 can be adjusted. The angle adjuster can be set as components such as a torque hinge and an angle adjustment disk.

[0050] Such as Figure 2As shown in the figure, a support rod 11 is provided on the base 10, and the projection plate 20 is arranged on the support rod 11. The angle adjustment member includes an elastic plate 61, a support rod 62, and a traction rope 63. Among them, one end of the elastic plate 61 is fixedly connected to the side of the rotating plate 32 facing the projection plate 20, and the other end of the elastic plate 61 abuts against the projection part 31. The support rod 62 is arranged on the support rod 11. The traction rope 63 is wound around the support rod 62. One end of the traction rope 63 is fixedly connected to the top of the screw sleeve 52, and the other end of the traction rope 63 passes through the rotating plate 32 and is connected to the projection part 31. Among them, when the projection assembly 30 is in the projection state, the traction rope 63 is tightened to drive the projection part 31 to abut against the elastic plate 61, causing the elastic plate 61 to bend. In this way, while the elastic plate 61 can provide support for the projection part 31, the projection angle of the projection part 31 can also be adjusted by adjusting the bending angle of the elastic plate 61. At this time, the projection part 31 is located at the projection position; when the projection assembly 30 is in the avoidance state, the screw sleeve 52 moves in the direction towards the projection plate 20, the traction rope 63 is unloaded, the elastic plate 61 returns to being straight and drives the projection part 31 to rotate to the same direction as the extension direction of the rotating plate 32. At this time, the projection part 31 is in the storage position.

[0051] Preferably, the screw sleeve 52 is provided with a winding assembly, and one end of the traction rope 63 is wound on the winding assembly. In this way, the one end of the traction rope 63 can be wound and released through the winding assembly, so that the pressure exerted by the projection part 31 on the elastic plate 61 can be controlled by the tightening degree of the traction rope 63, and then the bending degree of the elastic plate 61 can be changed, thereby realizing the adjustment of the projection angle of the projection part 31.

[0052] Specifically, the traction rope 63 can be selected as a steel wire rope, and the elastic plate 61 can be selected as a thin steel plate.

[0053] As Figure 2 and Figure 3 shown in the figure, a first connection ring 321 is arranged at one end of the rotating plate 32 away from the projection plate 20. A rotating shaft 311 is arranged at the bottom of the projection part 31. The rotating shaft 311 passes through the first connection ring 321, and the rotating shaft 311 is rotatably connected to the first connection ring 321. Such a setting has a simple structure and is convenient for the assembly and disassembly of the projection part 31 and the rotating plate 32.

[0054] As Figure 1 shown in the figure, a plurality of rollers 12 are arranged at the bottom of the base 10. The rollers 12 are used to drive the projection device to move in the horizontal direction. Through the rollers 12, the direction of the projection device can be moved during the screening to facilitate the viewing of people in different directions. After the screening is over, it is convenient to move, store, and carry the projection device through the rollers.

[0055] Wherein, a buffer pad 70 is provided on the side of the projection plate 20 facing the projection assembly 30. The buffer pad 70 is arranged corresponding to the projection part 31 to buffer the impact force generated on the projection plate 20 when the projection part 31 switches to the avoidance position, and to prevent damage to the projection part 31 or the projection plate 20.

[0056] In this embodiment, the specific material of the buffer pad 70 is not limited, and it can be made of buffer sponge, rubber or other materials.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations.

[0058] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0060] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0062] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A projection device, characterized in that, The projection device includes: A base (10); A projection plate (20), vertically arranged on the base (10); A projection assembly (30), arranged on the base (10), the projection assembly (30) includes a projection part (31), the projection assembly (30) has a relatively arranged projection state and an avoidance state. When the projection assembly (30) is in the projection state, the projection part (31) is away from the projection plate (20) to project on the projection plate (20). When the projection assembly (30) is in the avoidance state, the projection part (31) is attached to the projection plate (20); A driving member (40), the driving member (40) is arranged on the base (10), the driving member (40) is drivingly connected to the projection assembly (30), and the driving member (40) drives the projection part (31) to approach or move away from the projection plate (20), so that the projection assembly (30) switches between the projection state and the avoidance state.

2. The projection device according to claim 1, wherein The projection assembly (30) further includes a rotating plate (32), one end of the rotating plate (32) is rotatably arranged on the base (10), the driving member (40) is drivingly connected to the rotating plate (32) to drive the rotating plate (32) to rotate, and the other end of the rotating plate (32) is rotatably connected to the projection part (31).

3. The projection device according to claim 2, wherein The projection device further includes a transmission assembly (50), the transmission assembly (50) is arranged on the base (10) and located between the driving member (40) and the rotating plate (32), the transmission assembly (50) is drivingly connected to the driving member (40), and the driving member (40) drives the projection assembly (30) to switch between the projection state and the avoidance state through the transmission assembly (50).

4. The projection device according to claim 3, wherein, The transmission assembly (50) includes: A screw rod (51), rotatably arranged on the base (10), the screw rod (51) extends in the horizontal direction, and the driving member (40) drives the screw rod (51) to rotate; A nut sleeve (52), sleeved on the screw rod (51), the nut sleeve (52) is threadedly connected to the screw rod (51), a support member (53) is arranged on the nut sleeve (52), the support member (53) is located on the side of the rotating plate (32) away from the projection plate (20) and abuts against the projection plate (20). When the nut sleeve (52) moves on the screw rod (51), it drives the rotating plate (32) to approach the projection plate (20) through the support member (53), so as to realize the switching of the projection assembly (30) from the projection state to the avoidance state; A rotation stopping part, the rotation stopping part is arranged between the nut sleeve (52) and the base (10), and the rotation stopping part is used to limit the relative rotation of the nut sleeve (52) with respect to the screw rod (51).

5. The projection device according to claim 4, wherein The transmission assembly (50) further includes a rotation stopping rod (54). The axial direction of the rotation stopping rod (54) is parallel to the axial direction of the screw rod (51). The screw sleeve (52) is sleeved on the rotation stopping rod (54) to limit the relative rotation of the screw sleeve (52) with respect to the screw rod (51). The rotation stopping rod (54) forms the rotation stopping portion.

6. The projection device according to claim 4, wherein the projection device further includes an angle adjusting member. The angle adjusting member is connected to the projection portion (31). The angle adjusting member can adjust the rotation angle of the projection portion (31). The projection portion (31) has a projection position and a storage position arranged oppositely. When the projection portion (31) is in the projection position, there is an included angle between the extending direction of the projection portion (31) and the rotating plate (32). The projection direction of the projection portion (31) faces the projection plate (20). At this time, the projection assembly (30) is in the projection state. When the projection portion (31) is in the storage position, the extending direction of the projection portion (31) rotates to be the same as the extending direction of the rotating plate (32). At this time, the projection assembly (30) is in the avoidance state.

7. The projection device according to claim 6, characterized in that, A support rod (11) is provided on the base (10). The projection plate (20) is provided on the support rod (11). The angle adjusting member includes: an elastic plate (61). One end of the elastic plate (61) is fixedly connected to the side of the rotating plate (32) facing the projection plate (20). The other end of the elastic plate (61) abuts against the projection portion (31). a support rod (62) provided on the support rod (11). a traction rope (63). The traction rope (63) is wound around the support rod (62). One end of the traction rope (63) is fixedly connected to the top of the screw sleeve (52). The other end of the traction rope (63) passes through the rotating plate (32) and is connected to the projection portion (31). Wherein, when the projection assembly (30) is in the projection state, the traction rope (63) is tightened to drive the projection portion (31) to abut against the elastic plate (61) so that the elastic plate (61) is bent. At this time, the projection portion (31) is located at the projection position. When the projection assembly (30) is in the avoidance state, the screw sleeve (52) moves in the direction towards the projection plate (20). The traction rope (63) is unloaded, and the elastic plate (61) returns to be straight and drives the projection portion (31) to rotate to be the same as the extending direction of the rotating plate (32). At this time, the projection portion (31) is in the storage position.

8. The projection device according to claim 2, wherein a first connection ring (321) is provided at one end of the rotating plate (32) away from the projection plate (20). A rotating shaft is provided at the bottom of the projection portion (31). The rotating shaft is sleeved in the first connection ring (321), and the rotating shaft is rotatably connected to the first connection ring (321).

9. The projection device according to claim 4, wherein A plurality of rollers (12) are provided at the bottom of the base (10), and the rollers (12) are used to drive the projection device to move in the horizontal direction.

10. The projection device according to claim 6, wherein A buffer pad (70) is provided on one side of the projection plate (20) facing the projection assembly (30), and the buffer pad (70) is provided corresponding to the projection part (31) to buffer the impact force generated on the projection plate (20) when the projection part (31) switches to the avoidance position.

Images