WO2021135967A1

WO2021135967A1 - Projection device

Info

Publication number: WO2021135967A1
Application number: PCT/CN2020/137101
Authority: WO
Inventors: 刘宪; 余新; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2019-12-31
Filing date: 2020-12-17
Publication date: 2021-07-08
Also published as: CN211718679U

Abstract

A projection device (300). The projection device (300) comprises a housing (200) and a dustproof net assembly (100), wherein the housing (200) comprises a housing plate (210); and the dustproof net assembly (100) is fixedly provided on the housing (200). The dustproof net assembly (100) comprises: a first frame (10) provided with a first window (11) and having two opposite ends respectively provided with a first positioning part (12) and a second positioning part (13); a dustproof net (20) covering the first window (11); and a second frame (30) provided with a second window (31) and connected to the first frame (10) so that the dustproof net (20) is sandwiched between the first frame (10) and the second frame (30), wherein the first positioning part (12) and the second positioning part (13) are both used for positioning the first frame (10) on the housing plate (210) and limiting the stroke of the first frame (10); after the first frame (10) travels along the stroke limited by the first positioning part (12) and the second positioning part (13), the first frame (10) is clamped on the housing plate (210) by means of the first positioning part (12) and the second positioning part (13). Therefore, a mounting space needed by the dustproof net assembly (100) is small, and the mounting convenience of the dustproof net assembly (100) is improved.

Description

A projection equipment

Technical field

This application relates to the technical field of projection equipment, and in particular to a projection equipment.

Background technique

The dust-proof net of the existing projection equipment is generally fixed by a single fixed frame. The four sides of the dust-proof net are fixed on the fixed frame, and then the entire fixed frame is fixed on the housing. This method is inconvenient to disassemble and assemble, which is not conducive to preventing The dust net is quickly replaced. There is also a way to install the dust-proof net by means of sliding rails, that is, the dust-proof net slides on the shell to adopt the pull-out installation, but the overall structure is complicated, the processing cost is high, and the long drawing stroke requires high installation space. .

Utility model content

This application mainly provides a projection device to solve the problems of inconvenient disassembly and assembly of the dust filter assembly and large installation space required.

In order to solve the above technical problems, a technical solution adopted in this application is to provide a projection device. The projection device includes a housing and a dust-proof net assembly. The housing includes a shell plate, and the dust-proof net assembly is fixed on the housing; the dust-proof net assembly includes: a first frame is provided with a first window, and a first frame A first positioning portion and a second positioning portion are respectively provided at opposite ends of the air filter; the dust-proof net covers the first window; the second frame is provided with a second window, and the second frame is connected with the first frame to clamp the dust-proof net Set between the first frame and the second frame; wherein, the first positioning portion and the second positioning portion are both used to position the first frame on the shell plate and limit the stroke of the first frame, and the first frame is positioned along the first After the stroke defined by the second positioning part and the second positioning part is completed, the first positioning part and the second positioning part clamp the first frame to the shell plate.

In some embodiments, the first positioning portion and the second positioning portion each include a connecting portion connected in sequence, a stop portion bent from one end of the connecting portion to a side away from the first frame, and a relative fixed portion. The stop part is further bent and a guide part, the connecting part is connected to the first frame, and the stop part and the guide part cooperate to define the stroke of the first frame.

In some embodiments, the first positioning portion is a positioning bayonet or a gourd hole, and the second positioning portion is a gourd hole.

In some embodiments, one end of the shell plate is provided with a first positioning column, the opposite end of the shell plate is provided with the second positioning column, and the first positioning portion is engaged with the first positioning column. Then, the second positioning part is clamped to the second positioning post.

In some embodiments, the first positioning post includes a post and a limit cap, one end of the post is connected to the housing, the other end of the post is connected to the limit cap, the The first positioning portion is clamped to the cylinder and is restricted and stopped by the limiting cap along the axial direction of the cylinder.

In some embodiments, the projection device further includes a switch counting device installed on the housing plate and in contact with the first frame, and the switch counting device is used to detect and record the first frame. The number of times the frame is disassembled, and then the frequency of replacement of the dust-proof net is monitored.

In some embodiments, a detection plate is further provided on the end of the first frame where the first positioning part is located. When the first positioning part is clamped to the first positioning column, the detection plate abuts against On the switch shrapnel of the switch counting device.

In some embodiments, both sides of the first frame adjacent to the side where the first positioning portion and the second positioning portion are provided are provided with first folds, and the second frame A second fold is provided on the peripheral side of the, and the second fold is arranged around the dust-proof net.

In some embodiments, a limit post is provided on the first frame along the peripheral side of the first window, the dust screen is provided with an alignment opening, and the alignment opening is aligned with the limit post assembly.

In some embodiments, the limiting post is provided with a first assembly hole, the second frame is provided with a second assembly hole, and the first assembly hole and the second assembly hole are connected by a fastener. The dust-proof net is sandwiched between the first frame and the second frame.

The beneficial effect of the present application is: different from the prior art, the present application discloses a projection device. The first positioning part and the second positioning part are respectively provided at both ends of the first frame, and the second frame is provided to cooperate with the first frame to clamp the dust-proof net, and the first positioning part and the second positioning part are configured for Position the first frame on the shell plate and define the stroke of the first frame, and after the first frame travels along the stroke defined by the first positioning portion and the second positioning portion, the first positioning portion and the second positioning portion will The first frame is clamped to the shell plate, and then when the dust-proof net assembly is integrally installed and fixed on the shell plate, the dust-proof net assembly is first positioned on the shell plate through the first positioning part and the second positioning part, and then along the The stroke defined by the first positioning portion and the second positioning portion moves relative to the shell plate, so that the first positioning portion and the second positioning portion are clamped on the shell plate. The positioning is convenient and the limited stroke is short. The dust-proof net assembly is fixed on the shell plate, thereby effectively reducing the installation difficulty of the dust-proof netting assembly, improving the installation efficiency of the dust-proof netting assembly, and improving the installation convenience of the dust-proof netting assembly.

Description of the drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

Fig. 1 is a schematic structural diagram of an embodiment of a projection device provided by the present application;

2 is a schematic diagram of the installation structure of the dust-proof net assembly and the housing in the projection device of FIG. 1;

FIG. 3 is a schematic diagram of the structure of the dust-proof net component in the projection equipment of FIG.

Figure 4 is a schematic diagram of the exploded structure of the dust-proof net assembly of Figure 3;

Fig. 5 is a schematic diagram of the structure of the shell plate in Fig. 3;

6 is a schematic diagram of a connection structure between the first positioning portion and the first positioning column in FIG. 2;

Fig. 7 is an enlarged schematic diagram of area B in Fig. 5;

Fig. 8 is an enlarged schematic diagram of area A in Fig. 2;

Fig. 9 is an enlarged schematic diagram of area C in Fig. 2;

Fig. 10 is a schematic diagram of the connection structure of another embodiment of the first frame and the shell in Fig. 2.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

The terms "first", "second", and "third" in the embodiments of the present application are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first”, “second”, and “third” may explicitly or implicitly include at least one of the features. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.

The reference to "embodiments" herein means that a specific feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art clearly and implicitly understand that the embodiments described herein can be combined with other embodiments.

This application provides a projection device 300. Refer to FIGS. 1 to 4. FIG. 1 is a schematic structural diagram of an embodiment of the projection device provided in this application, and FIG. 2 is the installation structure of the dust-proof net assembly and the housing in the projection device of FIG. 1 Schematic diagram, FIG. 3 is a schematic structural diagram of the dust-proof net assembly in the projection device of FIG. 1, and FIG. 4 is an exploded structural diagram of the dust-proof net assembly in FIG. 3.

The projection device 300 includes a dust-proof net assembly 100 and a housing 200. The housing 200 includes a housing plate 210, and the dust-proof net assembly 100 is fixed on the housing 200.

Specifically, the dust-proof net assembly 100 is detachably connected to the shell 210.

The dust-proof net assembly 100 includes a first frame 10, a dust-proof net 20 and a second frame 30, wherein the dust-proof net 20 is sandwiched between the first frame 10 and the second frame 30.

The first frame 10 is provided with a first window 11, one end of the first frame 10 is provided with a first positioning portion 12, and the opposite end of the first frame 10 is provided with a second positioning portion 13; Window 11; a second window 31 is provided on the second frame 30, and the second frame 30 is connected to the first frame 10 to sandwich the dust-proof net 20 between the first frame 10 and the second frame 30.

The second window 31 may be arranged opposite to the first window 11 to facilitate air flow through the second window 31 and the first window 11. Alternatively, the second window 31 may also be arranged in a staggered position with the first window 11, which is not limited in this application, as long as the airflow can flow through the second window 31 and the first window 11.

The dust-proof net 20 is sandwiched between the first frame 10 and the second frame 30, and the two sides of the dust-proof net 20 respectively cover the first window 11 and the second window 31, so that the dust-proof net assembly 100 is installed in a When the device is installed, the ventilation and heat dissipation of the device can be enhanced, and external dust can also be prevented from entering the interior of the device.

The first positioning portion 12 and the second positioning portion 13 are both used to position the first frame 10 on the shell 210 and limit the stroke of the first frame 10, and the first frame 10 runs along the first positioning portion 12 and the second positioning portion 13 After the defined stroke is completed, the first positioning portion 12 and the second positioning portion 13 clamp the first frame 10 to the shell 210, so that the first frame 10 can be installed on the shell 200, and the dust-proof net The assembly 100 further prevents external dust and the like from entering the inside of the housing 200.

For example, a guide rail is provided on the shell 210, the first positioning portion 12 and the second positioning portion 13 are guide blocks, and a guide groove with a certain stroke is provided on the guide block. The guide groove is positioned and connected with the guide rail, and one side of the guide groove A card slot is also provided, one side of the guide rail is provided with a card block, and after the guide block travels along the guide rail to complete the stroke defined by the guide slot, the card block is clamped in the card slot.

Or, the first positioning portion 12 and the second positioning portion 13 are both bayonet ports, and the shell plate 210 is provided with a clamping post, and the clamping post is aligned with the bayonet and moves relatively along the stroke defined by the bayonet, and finally the bayonet is snapped together On the card column.

Or, the first positioning portion 12 and the second positioning portion 13 are both hanging ears, the shell 210 is provided with hanging nails, the hanging ears and the hanging nails are assembled in position, and the hanging nails move to and hang along the stroke defined by the hanging ears. Ear card connection.

The first embodiment

In this embodiment, referring to FIGS. 2 to 4, the first positioning portion 12 may be a positioning bayonet or a gourd hole, and the second positioning portion 13 may be a gourd hole, and both the positioning bayonet and the gourd hole have a limited stroke.

As shown in FIG. 5, a third window 211 is provided on the shell 210, and the third window 211 is arranged opposite to the first window 11, that is, the third window 211 is stacked on the first window 11, and the first window 11 is along the second direction. The projection on a reference plane is located within the projection range of the third window 211 on the same reference plane.

One end of the shell plate 210 is provided with a second positioning column 214 and a mounting hole 217, the opposite end of the shell plate 210 is provided with a first positioning column 212, and the end of the first frame 10 where the second positioning portion 13 is located is also provided with a mounting hole 16 After the second positioning part 13 is clamped to the second positioning post 214 and the first positioning part 12 is clamped to the first positioning post 212, the assembly hole 16 and the assembly hole 217 are connected by fasteners.

The fastener can be a captive screw. The captive screw is connected to the assembly hole 16. When the first frame 10 is clamped on the shell plate 210, the captive screw is tightened to connect the assembly hole 217 to further Therefore, the convenience of connection between the first frame 20 and the shell 210 is improved.

In this embodiment, after the first positioning portion 12 is aligned with the first positioning pillar 212 and the second positioning portion 13 is aligned with the second positioning pillar 214, the first frame 10 is further secured by a fastener. Connected to the shell 210.

In other embodiments, as shown in FIG. 6, the first positioning portion 12 is aligned with the first positioning pillar 212, and the second positioning portion 13 is aligned with the second positioning pillar 214, so that the first The frame 10 is fixed on the shell 210. For example, as shown in FIG. 6, the minimum distance of the first positioning portion 12 is smaller than the shaft diameter of the first positioning post 212, and then the first positioning portion 12 is aligned with the first positioning post 212 and can restrict the first positioning post 212. Break away.

As shown in Figure 3, the first positioning portion 12 is a positioning bayonet, and the first positioning portion 12 is provided on the edge of the first frame 10 to facilitate the relative movement of the first frame 10 along the stroke defined by the first positioning portion 12 Afterwards, the first positioning portion 12 is aligned and clamped to the first positioning post 212 to limit one end of the first frame 10.

As shown in FIG. 7, the first positioning column 212 includes a column body 215 and a limiting cap 216. One end of the column body 215 is connected to the shell plate 210, and the other end of the column body 215 is connected to the limiting cap 216. The first positioning portion 12 It is clamped to the cylinder 215 and is restricted and stopped by the limit cap 216 along the axial direction of the cylinder 215, and the opposite end of the first frame 10 opposite to the first positioning portion 12 is fixed on the shell 210, so that The first positioning portion 12 cannot be detached from the first positioning post 212, that is, the end where the first positioning portion 12 is located does not need to be fixed to the shell 210 by a connecting structure such as fasteners, thereby simplifying the first frame 10 and the shell 210 The connection method also improves the convenience of connection between the first frame 10 and the shell 210.

As shown in FIG. 7, the second positioning post 214 may be a hanging nail, the second positioning portion 13 is a gourd hole, and the second positioning portion 13 includes an avoiding portion 130 and a limiting portion 132 communicating with the avoiding portion 130. To avoid the second positioning post 214, the second positioning post 214 relatively slides from the avoiding portion 130 to the limiting portion 132 to be locked in position with the limiting portion 132. When the pegs are clamped with the limiting part 132, the first positioning part 12 is clamped with the column 215 at the same time, and the assembly hole 16 and the assembly hole 217 are aligned, which improves the connection between the first frame 10 and the shell 210 Convenience.

The movable distances of the first positioning portion 12 and the second positioning portion 13 in the second direction are relatively short, so that the entire dust-proof net assembly 100 requires less installation space.

As shown in FIGS. 2 to 5, the second positioning portion 13 is first aligned and assembled with the second positioning post 214 on the shell 210 from the first direction, so that the dust-proof net assembly 100 is initially aligned and hung on the shell 210 Above, the position of the dust-proof net assembly 100 is initially limited; then the first frame 10 is pushed to move in the second direction, so that the second positioning portion 13 is clamped to the second positioning post 214 in the second direction, and at the same time there is a first The positioning portion 12 is clamped to the first positioning post 212 along the second direction.

The first direction is the direction of the second frame 30 toward the first frame 10, and the second direction is the direction of the end of the first frame 10 where the second positioning portion 13 is directed to the end where the first positioning portion 12 is located.

In this embodiment, one end of the first frame 10 is provided with two first positioning portions 12, and the other end of the first frame 10 is provided with a second positioning portion 13 to form a three-point positioning, so that the installation of the first frame 10 more precise. In other embodiments, the number of the first positioning portion 12 can be one, three, four, etc., and the number of the second positioning portion 13 can be two, three, four, etc., and this application does not make any difference to their number. limit.

The first positioning portion 12 and the second positioning portion 13 are respectively provided at both ends of the first frame 10, and the second positioning portion 13 is first aligned and assembled with the second positioning post 214 from the first direction to assemble the dust-proof net assembly 100 is initially aligned and hung on the shell 210, and then the first frame 10 is pushed to move in the second direction, so that the second positioning portion 13 is clamped to the second positioning post 214 in the second direction, and at the same time there is a first positioning portion 12 is clamped to the first positioning post 212 in the second direction, and the second positioning part 13 has a short movable stroke in the second direction and can be clamped to the second positioning post 214, so that the dust-proof net assembly 100 requires The installation space is small, the alignment is very convenient, and the structure of the first positioning part 12 and the second positioning part 13 is simple, thereby effectively improving the installation convenience of the dust-proof net assembly 100 and improving the dust-proof net assembly The installation efficiency of 100 simplifies the installation steps of the dust-proof net assembly 100, and reduces the installation difficulty of the dust-proof net assembly 100.

As shown in Figure 4, in this embodiment, the first frame 10 is provided with a first fold 14 on both sides adjacent to the side where the first positioning portion 12 and the second positioning portion 13 are provided, and a second A folding edge 14 can strengthen the structural strength of the first frame 10 to prevent the first frame 10 from being deformed after multiple disassembly and assembly.

The second frame 30 is provided with second folds 32 on the peripheral side. The second folds 32 surround the dust net 20. The second folds 32 can strengthen the structural strength of the second frame 30 and also The peripheral side of the dust-proof net 20 can be protected and the position of the dust-proof net 20 may be restricted, so as to avoid that the dust-proof net 20 does not completely cover the first window 11 and the second window 31.

Further, a limit post 15 is provided on the first frame 10 along the periphery of the first window 11, and an alignment opening 22 is provided on the dust-proof net 20, and the alignment opening 22 is assembled with the limit post 15 in position, and further The position of the dust-proof net 20 is restricted to ensure that the dust-proof net 20 completely covers the first window 11 and the second window 31.

The limit post 15 is provided with a first assembly hole 150, and the second frame 30 is provided with a second assembly hole 301. The first assembly hole 150 and the second assembly hole 301 are connected by fasteners to clamp the dust-proof net 20 in Between the first frame 10 and the second frame 30.

That is, the second frame 30 presses the dust-proof net 20 on the first frame 10 from one side of the dust-proof net 20, and the second frame 30 resists the limit post 15, so as to ensure that the first frame 10 and the second frame The 30 pairs of dust-proof nets 20 have a certain clamping pre-tightening degree to prevent the dust-proof nets 20 from moving between the first frame 10 and the second frame 30, which is beneficial to enhance the dust-proof effect of the dust-proof net assembly 100; and The assembly hole 150 and the second assembly hole 301 are aligned and connected by a fastener, which may be a screw, a pin, or the like.

Since the dust-proof net 20 needs to be replaced regularly to ensure that the dust-proof net assembly 100 has good performance, it is necessary to provide a way to monitor the frequency of replacement of the dust-proof net 20.

As shown in FIGS. 2 and 9, the projection device 300 may also include a switch counting device 50, which is installed on the shell 210 and is in contact with the first frame 10, and the switch counting device 50 is used to detect and record the first frame 10 The number of times of disassembly, and the recorded data is transmitted to the monitoring platform, and combined with recording the time of disassembly of the first frame 10, the frequency of replacement of the dust-proof net 20 can be monitored to ensure that the dust-proof net 20 can be replaced on time, thereby Ensure that the performance of the dust-proof net 20 is reliable.

Specifically, on the first frame 10, a detection board 17 is also provided at one end where the first positioning portion 12 is located. When the first positioning portion 12 is clamped to the first positioning post 212 in the second direction, the detection board 17 abuts against the switch counting device 40 of the switch shrapnel 52 on.

When the first frame 10 is disassembled, the first frame 10 is separated from the first positioning post 212 in the direction opposite to the second direction, and at the same time, the detection plate 17 is separated from the switch spring 52, so that the switch counting device 40 can detect the first frame 10 The disassembly and assembly action can record the number of disassembly times of the first frame 10, and it can also be combined with detecting the time difference between the first frame 10 and the last disassembly and assembly to remind the user to replace the dust-proof net 20 in time.

In other embodiments, both ends of the shell plate 210 are provided with gourd holes, the first positioning portion 12 and the second positioning portion 13 are both third positioning posts, and the third positioning posts are aligned with the gourd holes and are aligned along the gourd holes. The defined stroke moves to be clamped with the gourd hole; wherein the structure of the third positioning pillar is similar to the structure of the first positioning pillar or the second positioning pillar.

Second embodiment

The difference between the second embodiment and the first embodiment is that the first positioning portion 12 and the second positioning portion 13 are both hanging ears.

Specifically, as shown in FIG. 10, both the first positioning portion 12 and the second positioning portion 13 include a connecting portion 120 connected in sequence, and a stop portion 122 bent from one end of the connecting portion 120 to the side away from the first frame 10. The connecting portion 120 is connected to the first frame 10 and the guide portion 124 further bent relative to the stop portion 122, and the stop portion 122 and the guide portion 124 cooperate to define the stroke of the first frame 10.

The shell plate 210 is provided with a blocking block 46 matched with the hanging ears. The blocking block 46 moves along the space defined by the guide portion 124 and the body of the first frame 10 to stop on the stop portion 122, so that the first frame 10 is clamped on the shell 210.

The guide portion 124 determines the stroke required to connect the first frame 10 and the block 46, and restricts the block 46 from being separated from the hanging ears, so that the hanging ears and the clamping block 46 can move a relatively short distance to realize the connection of the first frame 10 to the housing. The installation space required for the dust-proof net assembly 100 is small, and the alignment is very convenient, which effectively improves the installation convenience of the dust-proof net assembly 100, improves the installation efficiency of the dust-proof net assembly 100, and simplifies The installation steps of the dust-proof net assembly 100 are improved, and the installation difficulty of the dust-proof net assembly 100 is reduced.

In other embodiments, the shell plate 210 is provided with hanging ears at opposite ends, the first positioning portion 12 and the second positioning portion 13 are both clamping blocks, and the clamping block is aligned with the hanging ears and is defined along the hanging ears. The stroke moves until it engages with the mounting ears.

Different from the situation in the prior art, this application discloses a projection device. The first positioning part and the second positioning part are respectively provided at both ends of the first frame, and the second frame is provided to cooperate with the first frame to clamp the dust-proof net, and the first positioning part and the second positioning part are configured for Position the first frame on the shell plate and define the stroke of the first frame, and after the first frame travels along the stroke defined by the first positioning portion and the second positioning portion, the first positioning portion and the second positioning portion will The first frame is clamped to the shell plate, and then when the dust-proof net assembly is integrally installed and fixed on the shell plate, the dust-proof net assembly is first positioned on the shell plate through the first positioning part and the second positioning part, and then along the The stroke defined by the first positioning portion and the second positioning portion moves relative to the shell plate, so that the first positioning portion and the second positioning portion are clamped on the shell plate. The positioning is convenient and the limited stroke is short. The dust-proof net assembly is fixed on the shell plate, thereby effectively reducing the installation difficulty of the dust-proof netting assembly, improving the installation efficiency of the dust-proof netting assembly, and improving the installation convenience of the dust-proof netting assembly.

The above are only examples of this application, and do not limit the scope of this application. Any equivalent structure or equivalent process transformation made using the content of the description and drawings of this application, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of this application.

Claims

A projection device includes a housing and a dust-proof net assembly, the housing includes a shell plate, the dust-proof net assembly is fixed on the housing, and is characterized in that the dust-proof net assembly includes:

A first frame, the first frame is provided with a first window, one end of the first frame is provided with a first positioning portion, and the opposite end of the first frame is provided with a second positioning portion;

A dust-proof net, which covers the first window;

A second frame, a second window is provided on the second frame, and the second frame is connected to the first frame to sandwich the dust-proof net between the first frame and the second frame between;

Wherein, the first positioning portion and the second positioning portion are both used to position the first frame on the shell plate and limit the stroke of the first frame, and the first frame is along the first frame. After the stroke defined by a positioning portion and the second positioning portion is completed, the first positioning portion and the second positioning portion clamp the first frame to the shell plate.
The projection device according to claim 1, wherein each of the first positioning portion and the second positioning portion includes a connecting portion connected in sequence, and is bent from one end of the connecting portion to a side away from the first frame. A folded stop portion and a guide portion further bent relative to the stop portion, the connecting portion is connected to the first frame, and the stop portion and the guide portion cooperate to define the stroke of the first frame .
The projection device according to claim 1, wherein the first positioning portion is a positioning bayonet or a gourd hole, and the second positioning portion is a gourd hole.
The projection device according to claim 1, wherein one end of the housing plate is provided with a first positioning column, and the other end of the housing plate is provided with a second positioning column, and the first positioning portion is connected to the The first positioning pillar is clamped, and the second positioning portion is clamped with the second positioning pillar.
The projection device according to claim 4, wherein the first positioning column comprises a column body and a limit cap, one end of the column body is connected to the shell plate, and the other end of the column body is connected to For the limiting cap, the first positioning portion is clamped to the cylinder and is restricted and stopped by the limiting cap along the axial direction of the cylinder.
The projection device according to claim 4, wherein the projection device further comprises a switch counting device, the switch counting device is installed on the shell plate and is in contact with the first frame, and the switch counting device It is used to detect and record the number of times of disassembly of the first frame, and then monitor the frequency of replacement of the dust-proof net.
The projection device according to claim 6, wherein a detection board is further provided at one end of the first frame where the first positioning part is located, and when the first positioning part is clamped to the first positioning column , The detection board abuts on the switch shrapnel of the switch counting device.
The projection device according to claim 1, wherein the first frame is provided with a first frame on both sides adjacent to the side where the first positioning portion and the second positioning portion are located. Folding, the second frame is provided with a second flanging on the peripheral side, and the second flanging is arranged around the dust-proof net.
The projection device according to claim 1, wherein the first frame is provided with a limit post along the peripheral side of the first window, the dust-proof net is provided with an alignment opening, and the alignment opening Align and assemble with the limiting column.
The projection device according to claim 9, wherein the limiting post is provided with a first assembly hole, the second frame is provided with a second assembly hole, and the first assembly hole is connected to the second assembly hole. The assembly holes are connected by fasteners to sandwich the dust-proof net between the first frame and the second frame.