CN202033578U - A projector hanger - Google Patents

Abstract

The utility model relates to a projector bracket, and in particular to a projector hanger for fixing a projector under a ceiling. The utility model comprises a base installed under the ceiling, a vertical hollow shell is provided below the base, and the shell is fixedly connected to the base; a lifting sleeve is provided inside the shell, and the shell is slidably connected to the lifting sleeve; an adjusting device for adjusting an angle is provided at the lower end of the lifting sleeve, and a fixing bracket for fixing the projector is provided on the adjusting device. The lifting sleeve of the utility model can adjust the height of the projector, and then the angle of the projector can be adjusted through the adjusting device, and the adjustment method is relatively simple and easy to operate.

Description

A projector hanger

technical field

The utility model relates to a projector bracket, in particular to a projector hanger for fixing the projector under the ceiling.

Background technique

At present, projectors have been widely used in conference rooms, exhibition halls, etc. to project various types of flat images. For simple occasions, the projector can generally be used on the table to meet the requirements, but for large conferences, special exhibitions or special occasions, the projector is not convenient to be placed on the table, but needs to be hung under the ceiling. The current projector hanger does not have adjustability. Generally, the projector is hung on the hanger in advance and the angle is adjusted. The projector can project at the adjusted distance and angle, and there is no need to use it next time. Correction, when the projector is not in use, the projector can be placed in the ceiling through the expansion and contraction of the projection hanger, which can also play a good role in protecting the projector. However, every time the projector is used, it is necessary to adjust the height and angle of the projector, and the adjustment steps are relatively complicated, which wastes a lot of time and manpower.

Contents of the invention

The utility model solves the deficiencies in the prior art and provides a projector hanger with simple adjustment.

In order to solve the deficiencies in the prior art, the technical solution adopted by the utility model is:

A projector hanger, including a base installed under the ceiling, a vertical hollow shell is arranged under the base, and the shell is fixedly connected with the base; a lifting sleeve is arranged inside the shell, and the shell slides with the lifting sleeve Connection; the lower end of the lifting sleeve is provided with an adjustment device for adjusting the angle, and the adjustment device is provided with a fixed bracket for fixing the projector.

Wherein, the adjustment device includes a horizontal angle adjustment device and a pitch angle adjustment device.

Wherein, the adjustment device also includes an adjustment block arranged at the bottom of the lifting sleeve, the adjustment block is movably connected with the lifting sleeve, two adjustment holes are respectively opened on the upper and lower end faces of the adjustment block, and two adjustment holes on each end face The adjustment holes are set at the front and rear; the horizontal angle adjustment device includes a first adjustment plate, a horizontal angle adjustment component and an L-shaped plate, one side plate of the L-shaped plate is fixed in the middle of the front end of the adjustment block, and the L-shaped plate faces the lifting sleeve the left end face of the left end; the first adjusting plate is a vertically placed flat plate with vertical fins on the upper and lower sides. The two wings are attached to the upper and lower sides of the adjustment block. There is a pin shaft in the adjustment hole at the front of the adjustment block. The pin shaft is matched with the adjustment hole at the front of the adjustment block. The adjustment hole at the front and the through hole of the wing; the adjustment hole at the rear of the adjustment block is provided with a positioning pin, which cooperates with the adjustment hole and hinges the adjustment block and the first adjustment plate; the left side of the first adjustment plate A flange is provided, and a bump is provided between the flange and the L-shaped plate, and a coaxial through hole is opened on the bump, the flange, and the other side plate of the L-shaped plate; the horizontal angle adjustment component includes a first Bolts and springs, the screw rod of the first bolt passes through the flange, the bump, and the through hole on the other side plate of the L-shaped plate in turn, wherein the through hole on the L-shaped plate is a threaded hole, and the threaded hole between the L-shaped plate and the first bolt For connection, the screw rod of the first bolt is in interference fit with the through hole of the bump, the spring is sleeved on the screw rod between the bump and the L-shaped plate, and the screw rod outside the bump is provided with a nut.

Among them, a connecting plate is provided between the horizontal angle adjusting device and the adjusting block, and the connecting plate is provided with a mounting hole for connecting the horizontal angle adjusting device and the pitching angle adjusting device, and the middle part of the connecting plate is provided with a channel for moving the L-shaped plate , the upper and lower ends of the connecting plate are respectively provided with through holes for the upper and lower fins of the first adjusting plate to pass through; The second adjustment plate is located between the connection plate and the first adjustment plate, the second adjustment plate and the middle part of the connection plate are provided with through holes for the movement of the L-shaped plate, the second adjustment plate is fixed on the connection plate, and the L-shaped outer sides on both sides The vertical surface of the flange is in the same plane; the pitch angle adjustment device also includes a pitch angle adjustment part, and the pitch angle adjustment part includes a second bolt and a spring, and the horizontal surface on the left side of the lower L-shaped outer flange is provided with a Hole, the middle part of the left end of the first adjusting plate extends out the horizontal plate, and the horizontal plate has a shaft hole coaxial with the above-mentioned through hole, the screw rod of the second bolt passes through the through hole and the shaft hole, and the spring sleeve is in the through hole and On the screw between the shaft holes, nuts are provided on the screw outside the shaft holes, and the fixing brackets for fixing the projector are fixed on the vertical surfaces of the L-shaped outer flanges on both sides of the second adjusting plate.

Wherein, the rear side of the lifting sleeve is also provided with an up and down angle adjustment device. The up and down angle adjustment device includes a third adjustment plate and an up and down angle adjustment component. The third adjustment plate is fixed on the rear end surface of the lifting sleeve. There are two adjustment holes set at the front and rear respectively on the sides, vertical fins are respectively provided on the left and right sides of the third adjustment plate, and through holes corresponding to the adjustment holes on the left and right sides of the adjustment block are opened on the fins, and the two fins are attached to the On the left and right sides of the adjustment block, there is a pin shaft in the adjustment hole at the rear of the adjustment block. In the through hole of the plate; the adjustment hole at the front of the adjustment block is provided with a positioning pin, which cooperates with the adjustment hole and hinges the adjustment block and the third adjustment plate; the rear side of the adjustment block is provided with an L-shaped block, the third The middle part of the adjustment plate is provided with a through hole for the movement of the L-shaped plate. One side plate of the L-shaped plate is fixed on the adjustment block, and the other side plate of the L-shaped plate passes through the through hole in the middle of the third adjustment plate. The third adjustment plate There is a flange on the lower side of the flange, and a bump is provided between the flange and the L-shaped plate, and there are coaxial through holes on the bump, the flange, and the other side plate of the L-shaped plate; the upper and lower angle adjustment parts Including the third bolt and spring, the screw rod of the third bolt passes through the flange, the bump, and the through hole of the other side plate of the L-shaped plate in turn, wherein the spring is sleeved on the screw rod between the bump and the L-shaped plate, and is located at The screw rod outside the L-shaped plate is provided with a nut.

Wherein, the heads of the first bolt, the second bolt and the third bolt are all cylindrical knobs.

Wherein, the lower end of the lifting sleeve is provided with an end cover.

Wherein, the studs of the first bolt, the second bolt and the third bolt are all provided with washers.

The beneficial effects obtained by the utility model: a projector hanger, including a base installed under the ceiling, a vertical hollow shell is arranged under the base, and the shell is fixedly connected with the base; the inside of the shell is provided with a lifting sleeve, The casing is slidably connected with the lifting sleeve; the lower end of the lifting sleeve is provided with an adjusting device for adjusting the angle, and the adjusting device is provided with a fixing bracket for fixing the projector. The lifting sleeve can adjust the height of the projector, and then adjust the angle of the projector through the adjusting device. The adjustment method is relatively simple and the operation is convenient.

Description of drawings

Fig. 1 is a schematic diagram of the connection state of the first regulating plate of the present invention;

Fig. 2 is the state diagram that the utility model adds connecting plate on the basis of Fig. 1;

Fig. 3 is the state sketch map that the utility model adds the second regulating plate on the basis of Fig. 2;

Fig. 4 is a kind of structural representation of the utility model embodiment 1;

Fig. 5 is a schematic structural view of Embodiment 2 of the present utility model.

Labeled in the figure:

1——base, 2——housing, 3——spring,

4——the first bolt, 5——flange, 6——wing,

7——location pin, 8——pin shaft, 9——washer,

10——L-shaped plate, 11——connecting plate, 12——second bolt,

13——L-shaped flange, 14——fixed bracket, 15——the third bolt,

16——the third adjusting plate, 17——end cover, 18——adjusting block,

19——the first adjusting plate, 20——the second adjusting plate, 21——through hole,

22——lifting sleeve, 23——bump.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Example 1

As shown in Figures 1 to 4, a projector hanger includes a base 1 installed under the ceiling, a vertical hollow shell 2 is arranged below the base 1, and the shell 2 is fixedly connected to the base 1; the shell 2 There is a lifting sleeve 22 inside, and the housing 2 is slidingly connected with the lifting sleeve 22; the lower end of the lifting sleeve 22 is provided with an adjustment device for adjusting the angle, and the adjustment device is provided with a fixed bracket 14 for fixing the projector. Wherein, the adjustment device includes a horizontal angle adjustment device and a pitch angle adjustment device.

The angle adjustment of the projector is controlled by setting the adjustment device, and at the same time, the lifting sleeve 22 can adjust the height of the projector by raising and lowering, so as to realize the adjustment of the position and angle of the projector.

As shown in Figure 1, the adjustment device also includes an adjustment block 18 arranged at the bottom of the lifting sleeve 22, the adjustment block 18 is movably connected with the lifting sleeve 22, and two adjustment blocks are respectively opened on the upper and lower end surfaces of the adjustment block 18. Holes, two adjustment holes on each end face are set front and rear; the horizontal angle adjustment device includes a first adjustment plate 19, a horizontal angle adjustment part and an L-shaped plate 10, and one side plate of the L-shaped plate 10 is fixed on the adjustment block 18 The middle part of the front end face, and the L-shaped plate 10 faces the left end face of the lifting sleeve 22; the first adjusting plate 19 is a vertically placed flat plate with vertical fins 6 on the upper and lower sides, and the spacing between the fins 6 is the same as that of the regulating block 18 The upper and lower thicknesses are the same, and the wings 6 are provided with through holes corresponding to the adjustment holes on the adjustment block 18. Shaft 8, bearing pin 8 is matched with the adjustment hole at the front portion of the adjustment block 18, and the two ends of the shaft pin 8 are respectively located in the adjustment hole at the front portion of the adjustment block 18 and the through hole of the fin 6; Positioning pin 7 is arranged in the adjusting hole, and positioning pin 7 cooperates with adjusting hole and adjusts block 18 and the first regulating plate 19 is hinged; The left side of the first regulating plate 19 is provided with flange 5, and the A projection 23 is provided between the templates 10, and a coaxial through hole is provided on the projection 23, the flanging 5 and the other side plate of the L-shaped panel 10; the horizontal angle adjustment component includes a first bolt 4 and a spring 3, The screw rod of the first bolt 4 passes through the through hole of the other side plate of the flanging 5, the projection 23 and the L-shaped plate 10 successively, wherein the through hole on the L-shaped plate 10 is a threaded hole, and the L-shaped plate 10 and the first The bolts 4 are threaded, the screw rod of the first bolt 4 is in interference fit with the through hole of the bump 23, the spring 3 is sleeved on the screw rod between the bump 23 and the L-shaped plate 10, and the screw rod outside the bump 23 is provided with Nut, the inner side of the nut is provided with a washer 9, and the head of the first bolt 4 is a cylindrical knob.

During operation, rotate the cylinder knob on the head of the first bolt 4, because the first bolt 4 is an interference fit with the bump 23, the position of the bolt will not change, then the first bolt 4 drives the bump 23, the first adjustment plate 19 Relative to the adjustment block 18, at this time, the wings 6 on both sides of the first adjustment plate 19 cooperate with the adjustment block 18, and the rear adjustment holes of the wings 6 are hinged with the adjustment block 18, and the front adjustment holes of the wings 6 Cooperate with the pin shaft 8 clearance, when the first adjustment plate 19 moves, it will rotate with the hinge of the adjustment hole at the rear part of the fin 6 as the axis, and the rotation range is controlled by the adjustment hole at the front part of the fin 6 and the pin shaft 8. limited by the relative position. In this way, the horizontal angle adjustment function of the first adjustment plate 19 is realized. In the present invention, the horizontal angle adjustment range of the first adjustment plate 19 is 0~3 degrees. The head of the first bolt 4 is designed as a cylindrical knob to facilitate the operation of the rotating bolt.

As shown in Figure 3, a connection plate 11 is provided between the horizontal angle adjustment device and the adjustment block 18, and the connection plate 11 is provided with mounting holes for connecting the horizontal angle adjustment device and the pitch angle adjustment device. The lower end is respectively provided with through holes for the upper and lower fins 6 of the first adjusting plate 19 to pass through; The plate 20 is located between the connecting plate 11 and the first adjusting plate 19, the second adjusting plate 20 and the middle part of the connecting plate 11 have a through hole 21 for the movement of the L-shaped plate 10, and the second adjusting plate 20 is fixed on the connecting plate 11 , the vertical surfaces of the L-shaped valgus 13 on both sides are in the same plane; the pitch angle adjustment device also includes a pitch angle adjustment part, and the pitch angle adjustment part includes a second bolt 12 and a spring 3, and the L-shaped valgus on the lower side A through hole is provided on the horizontal surface of the left end of the limit 13, and the middle part of the left end of the first adjustment plate 19 extends out a horizontal plate, and the horizontal plate is provided with a threaded hole coaxial with the above-mentioned through hole, and the screw rod of the second bolt 12 passes through the through hole. hole and threaded hole, the second bolt 12 is threadedly connected with the horizontal plate, the screw rod of the second bolt 12 is in interference fit with the through hole, wherein the spring 3 is sleeved on the screw rod between the through hole and the threaded hole, and on the screw rod outside the threaded hole A nut is provided, and the inner side of the nut is provided with a washer 9, and the head of the second bolt 12 is a cylindrical knob, and the fixed bracket 14 for fixing the projector is fixed on the vertical surface of the outer flange on both sides of the second adjustment plate 20, such as Figure 4 shows.

The upper and lower sides of the second adjustment plate 20 are provided with L-shaped outer flanges 13, and the vertical surfaces of the L-shaped outer flanges 13 extend upwards and downwards respectively, which increases the installation area of the fixed bracket 14, and the flanges have a certain degree of flexibility. Elasticity, when the second bolt 12 is rotated, since the horizontal plate is connected with the first adjusting plate 19, and the first adjusting plate 19 is fixed on the connecting plate 11, the horizontal plate is basically in a motionless state. The shape of the outer flange 13 will be distorted, which will affect the position of the vertical surface of the L-shaped outer flange 13 on the lower side. At the same time, the fixed bracket 14 installed on the L-shaped outer flange 13 will be driven to take the fixed part of the upper end of the fixed bracket 14 as the axis. Rotate, thereby changing the verticality of the fixed bracket 14, and then changing the pitch angle of the projector installed on the fixed bracket 14.

Embodiment 2, as shown in Figure 5, this embodiment is basically the same as Embodiment 1, the difference is: in this example, the rear side of the lifting sleeve 22 is also provided with an up and down angle adjustment device, and the up and down angle adjustment device includes a first Three adjustment plates 16 and up and down angle adjustment components, the third adjustment plate 16 is fixed on the rear end face of the lifting sleeve 22, the left and right sides of the adjustment block 18 are respectively provided with two adjustment holes that are arranged front and rear, the left and right sides of the third adjustment plate 16 Vertical fins 6 are respectively provided on the sides, and the fins 6 are provided with through holes corresponding to the adjustment holes on the left and right sides of the adjustment block 18. The two fins 6 are attached to the left and right sides of the adjustment block 18. There is a pin shaft 8 in the adjustment hole of the adjustment block, and the pin shaft 8 is in clearance fit with the adjustment hole at the rear of the adjustment block 18, and the two ends of the pin shaft 8 are respectively located in the adjustment hole at the rear of the adjustment block 18 and the through hole of the fin 6 ; The adjustment hole at the front of the adjustment block 18 is provided with a positioning pin 7, and the positioning pin 7 cooperates with the adjustment hole and the adjustment block 18 and the third adjustment plate 16 are hinged; the rear side of the adjustment block 18 is provided with an L-shaped block. The middle part of the three adjusting plates 16 is provided with a through hole for the movement of the L-shaped plate 10. One side plate of the L-shaped plate 10 is fixed on the adjusting block 18, and the other side plate of the L-shaped plate passes through the through hole in the middle part of the third adjusting plate 16. hole, the underside of the third adjusting plate 16 is provided with a flange 5, and between the flange 5 and the L-shaped plate 10, a projection 23 is provided, and the other side of the projection 23, the flange and the L-shaped plate 10 The plate has a coaxial through hole; the upper and lower angle adjustment parts include the third bolt 15 and the spring 3, and the screw rod of the third bolt 15 passes through the flange 5, the protrusion 23, and the passage of the other side plate of the L-shaped plate 10 in turn. hole, wherein the through hole on the L-shaped plate 10 is a threaded hole, the L-shaped plate 10 is threaded with the third bolt 15, the screw rod of the third bolt 15 is in interference fit with the through hole of the bump 23, and the spring 3 is sleeved on the bump 23 and the screw rod between the L-shaped plate 10, the screw rod positioned outside the L-shaped plate 10 is provided with a nut, the inside of the nut is provided with a washer 9, and the head of the third bolt 15 is a cylindrical knob. Wherein, the lower end of the lifting sleeve 22 is provided with an end cover 17 .

During operation, the cylindrical knob on the head of the third bolt 15 is rotated. Since the third bolt 15 is an interference fit with the projection 23, the position of the bolt will not change, and the first bolt 4 drives the L-shaped plate 10 and the adjustment block 18 relative to each other. The third adjustment plate 16 moves. At this time, the fins 6 on both sides of the third adjustment plate 16 cooperate with the adjustment block 18, and the front portion adjustment hole of the fin 6 is hinged with the adjustment block 18, and the rear portion of the fin 6 is adjusted. Hole and bearing pin 8 gap fit, and when adjusting block 18 moves, just can rotate with the hinge of the adjusting hole of wing 6 anterior portion as axis, and the rotation range is controlled by the adjusting hole of wing 6 rear portion and bearing pin 8 at the same time. relative position. In this way, the function of adjusting the up and down angles of the third adjusting plate 16 is realized. In the present invention, the adjustment range of the up and down angle of the third adjusting plate 16 is 0~5 degrees. The head of the third bolt 15 is designed as a cylindrical knob to facilitate the operation of the rotating bolt. At the same time, the lower end of the lifting sleeve 22 is provided with an end cover 17, which can prevent the sleeve from moving downwards too far, and break away from the housing 2, so as to protect the safety of the device.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than limiting the protection scope of the present utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art Personnel should understand that the technical solution of the utility model can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the utility model.

Claims (8)

1. A projector hanger, characterized in that: it comprises a base installed under the ceiling, a vertical hollow housing is provided below the base, and the housing is fixedly connected to the base; the inside of the housing is provided with a lifting sleeve, The casing is slidably connected with the lifting sleeve; the lower end of the lifting sleeve is provided with an adjusting device for adjusting the angle, and the adjusting device is provided with a fixing bracket for fixing the projector. 2. A projector hanger according to claim 1, wherein the adjustment device comprises a horizontal angle adjustment device and a pitch angle adjustment device. 3. A projector hanger according to claim 2, characterized in that: the adjustment device also includes an adjustment block arranged at the bottom of the lifting sleeve, the adjustment block is movably connected with the lifting sleeve, and the upper and lower sides of the adjustment block Two adjustment holes are respectively opened on each end surface, and the two adjustment holes on each end surface are arranged front and back; the horizontal angle adjustment device includes a first adjustment plate, a horizontal angle adjustment part and an L-shaped plate, and one side of the L-shaped plate The plate is fixed in the middle of the front end of the adjustment block, and the L-shaped plate faces the left end of the lifting sleeve; the first adjustment plate is a vertically placed flat plate with vertical wings on both sides, and the distance between the wings is the same as that of the adjustment block. The thickness is the same, and there are through holes corresponding to the adjustment holes on the adjustment block on the fins. The two fins are attached to the upper and lower sides of the adjustment block. The adjustment hole at the front part is clearance fit, and the two ends of the pin shaft are respectively located in the adjustment hole at the front part of the adjustment block and the through hole of the fin; the adjustment hole at the rear part of the adjustment block is provided with a positioning pin, and the positioning pin is matched with the adjustment hole And the adjustment block and the first adjustment plate are hinged; the left side of the first adjustment plate is provided with a flanging, and a bump is provided between the flanging and the L-shaped plate, and the other of the bump, the flanging, and the L-shaped plate One side plate has a coaxial through hole; the horizontal angle adjustment component includes a first bolt and a spring, and the screw rod of the first bolt passes through the flange, the bump, and the through hole of the other side plate of the L-shaped plate in turn, wherein L The through hole on the type plate is a threaded hole, the L-type plate is threadedly connected with the first bolt, the screw rod of the first bolt is in interference fit with the through hole of the bump, and the spring is sleeved on the screw rod between the bump and the L-type plate. Nuts are arranged on the screw rods outside the projections. 4. A projector hanger according to claim 3, characterized in that: a connecting plate is provided between the horizontal angle adjusting device and the adjusting block, and the connecting plate is opened for connecting the horizontal angle adjusting device and the pitch angle adjusting device The middle part of the connecting plate is provided with a channel for moving the L-shaped plate, and the upper and lower ends of the connecting plate are respectively provided with through holes for the upper and lower fins of the first adjusting plate to pass through; the pitch angle adjustment device includes The upper and lower sides are provided with the second adjustment plate with L-shaped outward flange, the second adjustment plate is located between the connection plate and the first adjustment plate, and the second adjustment plate and the middle part of the connection plate are provided with through holes for the movement of the L-shaped plate , the second adjustment plate is fixed on the connecting plate, and the vertical surfaces of the L-shaped outer flanges on both sides are in the same plane; the pitch angle adjustment device also includes a pitch angle adjustment component, and the pitch angle adjustment component includes a second bolt and a spring, A through hole is provided on the horizontal surface on the left side of the L-shaped outer flange on the lower side. The middle part of the left end of the first adjustment plate extends outwards to a horizontal plate. The horizontal plate is provided with a shaft hole coaxial with the above-mentioned through hole. The second bolt The screw goes through the through hole and the hole, wherein the spring is sleeved on the screw between the through hole and the shaft hole, and the screw outside the shaft hole is provided with a nut, and the fixing bracket for fixing the projector is fixed on both sides of the second adjustment plate The vertical face of the L-shaped outer flange. 5. A kind of projector hanger according to claim 4, characterized in that: the rear side of the lifting sleeve is also provided with an up and down angle adjustment device, and the up and down angle adjustment device includes a third adjustment plate and an up and down angle adjustment part, The third adjustment plate is fixed on the rear end surface of the lifting sleeve, and the left and right sides of the adjustment block are respectively provided with two adjustment holes arranged front and rear, and the left and right sides of the third adjustment plate are respectively provided with vertical fins, and the fins are provided with The adjustment holes on the left and right sides of the adjustment block correspond to the through holes, and the two wings are attached to the left and right sides of the adjustment block. There is a pin shaft in the adjustment hole at the rear of the adjustment block, and the pin shaft is matched with the adjustment hole at the rear of the adjustment block. , and the two ends of the pin shaft are respectively located in the adjustment hole at the rear of the adjustment block and the through hole of the fin; the adjustment hole at the front of the adjustment block is provided with a positioning pin, which cooperates with the adjustment hole and connects the adjustment block and the third The adjustment plate is hinged; the rear side of the adjustment block is provided with an L-shaped block, and the middle part of the third adjustment plate is provided with a through hole for the movement of the L-shaped plate. One side plate of the L-shaped plate is fixed on the adjustment block, and the other side of the L-shaped plate One side plate passes through the through hole in the middle part of the third adjusting plate, and the underside of the third adjusting plate is provided with a flanging, and a bump is provided between the flanging and the L-shaped plate, and the bump, the flanging and the L-shaped The other side of the plate has a coaxial through hole; the upper and lower angle adjustment components include a third bolt and a spring, and the screw rod of the third bolt passes through the flange, the bump, and the through hole of the other side of the L-shaped plate in turn. , wherein the spring is sleeved on the screw rod between the bump and the L-shaped plate, and the screw rod outside the L-shaped plate is provided with a nut. 6. A projector hanger according to claim 5, wherein the heads of the first bolt, the second bolt and the third bolt are all cylindrical knobs. 7. A projector hanger according to any one of claims 1-6, characterized in that: the lower end of the lifting sleeve is provided with an end cover. 8 . The projector hanger according to claim 6 , wherein washers are provided on the studs of the first bolt, the second bolt and the third bolt.

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