Lifting assembly and projection curtain device

Abstract

The utility model discloses a lifting assembly and a projection curtain device. The lifting assembly comprises a first arm rod; a second arm lever; the first arm rod and the second arm rod are rotationally connected through the modular joint assembly; the two ends of the modular joint assembly are detachably connected with the first arm rod and the second arm rod correspondingly. Through modular design of the middle joint, the preparation difficulty, preparation cost and maintenance cost of the lifting assembly can be reduced, and the preparation efficiency and reliability of the lifting assembly are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of projection screens, in particular to a lifting assembly and a projection screen device. BACKGROUND

[0002] The installation and use scene of the vehicle-mounted projection screen is usually fixed in a specific box, and the environment of the vehicle-mounted box is relatively complex. Reliability and appearance modeling are usually considered, and there are high requirements for the projection effect.

[0003] In the related art, the vehicle-mounted projection screen is generally lifted or lowered by a lifting arm rod. The middle joint of the lifting arm rod is connected to the upper and lower connecting rods of the screen arm rod. The upper and lower connecting rods are rotationally connected through the middle joint.

[0004] However, the existing middle joint and screen arm rod are usually of a whole structure without modular design, and have high integration, which leads to great difficulty in preparing the lifting assembly and makes it difficult to install and adjust. Content of the utility model

[0005] The technical problem solved by the present application is to provide a lifting assembly and a projection screen device, which can solve the problems of complex preparation and difficult installation and disassembly of the existing lifting assembly.

[0006] To solve the above technical problems, one technical solution adopted by the present application is to provide a lifting assembly, comprising: a first arm rod; a second arm rod; a modular joint assembly, the first arm rod and the second arm rod being rotationally connected through the modular joint assembly; wherein the two ends of the modular joint assembly are detachably connected with the first arm rod and the second arm rod, respectively.

[0007] The modular joint assembly comprises a first joint seat and a second joint seat, the first joint seat and the second joint seat are connected in cooperation to form a containing space, the containing space is provided with a middle shaft and a torsion spring; the torsion spring is nested on the middle shaft, and the two ends of the torsion spring are connected with the first joint seat and the second joint seat, respectively; one end of the first joint seat away from the second joint seat is connected with the first arm rod, and one end of the second joint seat away from the first joint seat is connected with the second arm rod.

[0008] The first joint seat comprises a first cylinder and a first connecting arm connected with each other, and the second joint seat comprises a second cylinder and a second connecting arm connected with each other; the first cylinder is matched with the second cylinder to connect the first joint seat and the second joint seat; the first connecting arm is connected with the first arm rod, and the second connecting arm is connected with the second arm rod.

[0009] The first cylinder body is provided with a first matching part, and the first cylinder body is provided with a first accommodating cavity in the axial direction. The second cylinder body is provided with a second matching part, and the second cylinder body is provided with a second accommodating cavity in the axial direction. The axial direction is the length extension direction of the middle shaft. The first matching part is matched and connected with the second matching part, so that the first cylinder body is matched with the second cylinder body to connect the first joint seat and the second joint seat. The first accommodating cavity and the second accommodating cavity form an accommodating space. One end of the torsion spring is fixedly connected with the first cylinder body, and the other end of the torsion spring is fixedly connected with the second cylinder body.

[0010] The middle part of the first cylinder body is provided with a first through hole, and the middle part of the second cylinder body is provided with a second through hole. The first through hole and the second through hole are concentrically arranged, and the second through hole is a flat position. The middle shaft includes a first stepped shaft and a second stepped shaft. The diameter of the first stepped shaft is greater than the diameter of the second stepped shaft. The first stepped shaft is provided with a first flange at one end away from the second stepped shaft. The diameter of the first flange is greater than the diameter of the first through hole. The second stepped shaft is a flat position shaft at one end away from the first stepped shaft. The middle shaft passes through the first through hole and the second through hole. The flat position shaft of the middle shaft is matched with the flat position of the second through hole to connect the first joint seat and the second joint seat.

[0011] The periphery of the first through hole is provided with a first limiting assembly. The first stepped shaft of the middle shaft passes through the first limiting assembly to be matched with the first cylinder body through the first limiting assembly. The outer side of the second through hole is provided with a second limiting assembly. The second stepped shaft of the middle shaft passes through the second through hole and is matched with the second limiting assembly to realize the axial limiting of the middle shaft.

[0012] The first limiting assembly includes a positioning bushing, a second flange arranged at one end of the positioning bushing, and a lubricating gasket arranged at the inner side of the second through hole. The first stepped shaft passes through the positioning bushing. The first flange of the first stepped shaft abuts against the second flange. The edge of the first stepped shaft away from the first flange abuts against the lubricating gasket. The second limiting assembly includes a lock washer and a nut. The second stepped shaft of the middle shaft passes through the second through hole and the lock washer. The nut is used to lock the second stepped shaft.

[0013] The middle part of the first cylinder body is provided with a middle shaft. The middle shaft includes a first shaft body, a second shaft body and a third shaft body. The diameter of the first shaft body is greater than the diameter of the second shaft body. The diameter of the second shaft body is greater than the diameter of the third shaft body. The middle part of the second cylinder body is provided with a third through hole and a fourth through hole connected with each other. The fourth through hole is arranged close to the first cylinder body. The diameter of the fourth through hole is greater than the diameter of the second shaft body and smaller than the diameter of the first shaft body. The diameter of the third through hole is greater than the diameter of the third shaft body and smaller than the diameter of the second shaft body. The middle shaft passes through the fourth through hole and the third through hole to connect the first joint seat and the second joint seat.

[0014] The outer side of the first shaft body is sleeved with a first bearing, the outer side of one end of the second shaft body close to the first shaft body is sleeved with a sleeve, and the outer side of one end of the second shaft body close to the third shaft body is sleeved with a second bearing; the outer side of the third through hole is provided with a third limiting component, and the third shaft body of the middle shaft passes through the third through hole and cooperates with the third limiting component to realize axial limiting of the middle shaft.

[0015] To solve the above technical problems, the second technical solution of the present application is to provide a projection screen device, comprising a first cover body and a second cover body arranged opposite to each other, a screen body, and a lifting assembly as described above; wherein the first side edge of the screen body is connected with the first cover body, and the second side edge of the screen body is connected with the second cover body; wherein the first side edge and the second side edge are arranged opposite to each other; one end of the first arm rod of the lifting assembly is connected with the first cover body, the other end of the first arm rod is connected with the modular joint assembly, one end of the second arm rod is connected with the modular joint assembly, and the other end of the second arm rod is connected with the second cover body.

[0016] The beneficial effects of the present application are: different from the related art, the present application provides a lifting assembly and a projection screen device, by modularizing the intermediate joint, the intermediate joint and the screen arm rod can be independently prepared, thereby not only reducing the preparation difficulty of the lifting assembly, but also improving the preparation efficiency of the lifting assembly. Further, by detachably connecting the two ends of the modular joint assembly with the first arm rod and the second arm rod respectively, it is beneficial to the installation and disassembly of the lifting assembly. When the modular joint assembly fails, by disassembling the modular joint assembly and replacing it, the lifting assembly can be quickly repaired, thereby reducing the installation cost and maintenance cost of the lifting assembly, and improving the reliability of the lifting assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor.

[0018] Figure 1 is an assembly structure schematic diagram of the lifting assembly of the present application;

[0019] Figure 2 is Figure 1 is a three-dimensional structure schematic diagram of the modular joint assembly in the embodiment;

[0020] Figure 3 is Figure 2 is a cross-sectional structure schematic diagram of the first embodiment of the modular joint assembly in the embodiment;

[0021] Figure 4 isFigure 3 Exploded structural diagram of the middle modular joint assembly;

[0022] Figure 5 Figure 4 Exploded structural diagram of the middle modular joint assembly rotated 180 degrees;

[0023] Figure 6 Figure 2 Front view of the middle modular joint assembly;

[0024] Figure 7 Figure 2 Rear view of the middle modular joint assembly;

[0025] Figure 8 Figure 2 Right view of the middle modular joint assembly;

[0026] Figure 9 Figure 2 Left view of the middle modular joint assembly;

[0027] Figure 10 Figure 2 Bottom view of the middle modular joint assembly;

[0028] Figure 11 Figure 3 Wobbling amount diagram of the middle modular joint assembly;

[0029] Figure 12 Figure 2 Sectional structural diagram of the second embodiment of the middle modular joint assembly;

[0030] Figure 13 Figure 12 Exploded structural diagram of the middle modular joint assembly;

[0031] Figure 14 Figure 13 Exploded structural diagram of the middle modular joint assembly rotated 180 degrees;

[0032] Figure 15 The structural diagram of the projection screen device of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0034] ​​​​​​​​​​The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the embodiments of the present application and the accompanying claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of one.

[0035] It should be understood that the term "and / or" used herein only describes an association relationship of associated objects, which means that there can be three relationships, for example, A and / or B can represent three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0036] It should be understood that the terms "include", "contain" or any other variant used herein are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] In the related art, the vehicle-mounted projection curtain is generally lifted or lowered by a lifting arm rod. The middle joint of the lifting arm rod and the upper and lower links of the curtain arm rod are connected. The upper and lower links are connected by the middle joint. However, the existing middle joint and curtain arm rod are usually of a whole structure without modular design, and have a high integration degree, which leads to a high difficulty in preparing the lifting assembly and a high difficulty in installation and adjustment.

[0038] Based on the above situation, the present application provides a lifting assembly and a projection curtain device, which can solve the problems of complex preparation, difficult installation and disassembly of the existing lifting assembly.

[0039] The lifting assembly provided in the application comprises a first arm rod, a second arm rod and a modular joint assembly, the first arm rod and the second arm rod are rotationally connected through the modular joint assembly; wherein the two ends of the modular joint assembly are respectively detachably connected with the first arm rod and the second arm rod. Through the modular design of the intermediate joint, the intermediate joint and the curtain arm rod can be independently prepared, thereby not only reducing the preparation difficulty of the lifting assembly, but also improving the preparation efficiency of the lifting assembly. Further, by detachably connecting the two ends of the modular joint assembly with the first arm rod and the second arm rod respectively, it is beneficial to the installation and disassembly of the lifting assembly. When the modular joint assembly fails, by disassembling the modular joint assembly and replacing it, the lifting assembly can be quickly repaired, thereby reducing the installation cost and maintenance cost of the lifting assembly, and improving the reliability of the lifting assembly.

[0040] In order to illustrate the specific structure of the lifting assembly of the application, please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 is an assembly structure schematic diagram of the lifting assembly of the application, Figure 2 is Figure 1 a perspective structure schematic diagram of the modular joint assembly in Figure 3 is Figure 2 a cross-sectional structure schematic diagram of the first embodiment of the modular joint assembly.

[0041] In the embodiment, the lifting assembly 100 comprises a first arm rod 11, a second arm rod 12 and a modular joint assembly 20. The first arm rod 11 and the second arm rod 12 are rotationally connected through the modular joint assembly 20. The two ends of the modular joint assembly 20 are respectively detachably connected with the first arm rod 11 and the second arm rod 12.

[0042] In the embodiment, the modular joint assembly 20 comprises a first joint seat 30 and a second joint seat 40, the first joint seat 30 and the second joint seat 40 are connected in cooperation to form a containing space, the containing space is provided with an intermediate shaft 50 and a torsion spring 501. The torsion spring 501 is nested on the intermediate shaft 50, and the two ends of the torsion spring 501 are respectively connected with the first joint seat 30 and the second joint seat 40.

[0043] The torsion spring 501 is used to provide damping force for the relative movement between the first joint seat 30 and the second joint seat 40.

[0044] In the embodiment, the end of the first joint seat 30 away from the second joint seat 40 is connected with the first arm rod 11, and the end of the second joint seat 40 away from the first joint seat 30 is connected with the second arm rod 12.

[0045] In some embodiments, the first joint base 30 comprises a first barrel 31 and a first connecting arm 32 connected to each other, and the second joint base 40 comprises a second barrel 41 and a second connecting arm 42 connected to each other.

[0046] In the embodiment, the first barrel 31 cooperates with the second barrel 41 to connect the first joint base 30 and the second joint base 40.

[0047] In some embodiments, the first barrel 31 is provided with a first matching part 310, and the first barrel 31 is provided with a first accommodating cavity in the axial direction. The second barrel 41 is provided with a second matching part 410, and the second barrel 41 is provided with a second accommodating cavity in the axial direction. The axial direction is the length extension direction of the central axis 50. The first matching part 310 cooperates with the second matching part 410 to connect the first barrel 31 and the second barrel 41 to connect the first joint base 30 and the second joint base 40. The first accommodating cavity and the second accommodating cavity form an accommodating space. One end of the torsion spring 501 is fixedly connected to the first barrel 31, and the other end of the torsion spring 501 is fixedly connected to the second barrel 41.

[0048] In some specific embodiments, the first matching part 310 is a boss, and the second matching part 410 is a groove.

[0049] It can be understood that through the cooperation and connection of the first matching part 310 and the second matching part 410, the displacement of the modular joint assembly 20 in the axial direction can be limited, thereby limiting the activity range of the modular joint assembly 20, and then improving the stability of the lifting assembly 100.

[0050] In the embodiment, the first connecting arm 32 is connected to the first arm rod 11, and the second connecting arm 42 is connected to the second arm rod 12.

[0051] In some specific embodiments, the first connecting arm 32 and the second connecting arm 42 are provided with fixing holes (not shown in the figure), and the first arm rod 11 and the second arm rod 12 are provided with a plurality of positioning holes (not shown in the figure). After positioning the fixing hole on the first connecting arm 32 and the positioning hole on the first arm rod 11, and positioning the fixing hole on the second connecting arm 42 and the positioning hole on the second arm rod 12, the locking screw is inserted into the fixing hole and the positioning hole, so as to connect the modular joint assembly 20 with the first arm rod 11 and the second arm rod 12, thereby completing the rapid assembly of the lifting assembly 100.

[0052] In other specific embodiments, by disassembling the locking screw, the first arm rod 11 and the first connecting arm 32 can be disassembled, and the second arm rod 12 and the second connecting arm 42 can be disassembled, thereby quickly disassembling the modular joint assembly 20 from the first arm rod 11 and the second arm rod 12.

[0053] It can be understood that, by modularizing the intermediate joint, the intermediate joint and the curtain arm rod can be prepared independently, thereby not only reducing the preparation difficulty of the lifting assembly 100, but also improving the preparation efficiency of the lifting assembly 100. Further, by detachably connecting the two ends of the modular joint assembly 20 with the first arm rod 11 and the second arm rod 12 respectively, the installation and disassembly of the lifting assembly 100 are facilitated. When the modular joint assembly 20 fails, the lifting assembly 100 can be quickly repaired by disassembling and replacing the modular joint assembly 20, thereby reducing the installation cost and maintenance cost of the lifting assembly 100, and improving the reliability of the lifting assembly 100.

[0054] Please refer to Figure 3 , Figure 4 and Figure 5 , Figure 4 is Figure 3 an exploded structural schematic view of the modular joint assembly in Figure 5 is Figure 4 an exploded structural schematic view of the modular joint assembly rotated 180 degrees in

[0055] In the embodiment, the middle part of the first cylinder 31 is provided with a first through hole 301, and the middle part of the second cylinder 41 is provided with a second through hole 401. The first through hole 301 and the second through hole 401 are concentrically arranged, and the second through hole 401 is a flat position.

[0056] Among them, the flat position refers to a flat surface formed by milling processing of a circular or other shape that is difficult to fix or clamp. In the mechanical aspect, the flat position is a common structural feature that changes the local part of the originally circular or complex shape to a flat surface, so that the part can be better fixed or clamped.

[0057] In the embodiment, the middle shaft 50 includes a first stepped shaft 51 and a second stepped shaft 52. The diameter of the first stepped shaft 51 is greater than the diameter of the second stepped shaft 52. The end of the first stepped shaft 51 away from the second stepped shaft 52 is provided with a first flange 53, and the diameter of the first flange 53 is greater than the diameter of the first through hole 301. The end of the second stepped shaft 52 away from the first stepped shaft 51 is a flat position shaft. The middle shaft 50 passes through the first through hole 301 and the second through hole 401. The flat position shaft of the middle shaft 50 cooperates with the flat position of the second through hole 401 to connect the first joint seat 30 and the second joint seat 40.

[0058] It can be understood that the diameter of the first stepped shaft 51 is greater than the diameter of the second stepped shaft 52, and the second through hole 401 is a flat position matched with the flat position at the end of the second stepped shaft 52, so that the end of the first stepped shaft 51 close to the second through hole 401 will abut against the second barrel 41 on the side of the second through hole 401, and the second stepped shaft 52 can pass through the second through hole 401 and be fixed with the second through hole 401, so as to reduce the possibility of rotation of the second stepped shaft 52 in the second through hole 401, thereby achieving the circumferential limiting of the central shaft 50.

[0059] Further, since the diameter of the first flange 53 is greater than the diameter of the first through hole 301, the first flange 53 can also shield the first through hole 301 to prevent dust from entering the inside of the modular joint assembly 20 through the first through hole 301, thereby playing a dustproof role.

[0060] In the embodiment, the first through hole 301 is provided with a first limiting assembly 60 on the side, and the first stepped shaft 51 of the central shaft 50 passes through the first limiting assembly 60 to be matched with the first barrel 31 through the first limiting assembly 60. The outer side of the second through hole 401 is provided with a second limiting assembly 70, and the second stepped shaft 52 of the central shaft 50 passes through the second through hole 401 and is matched with the second limiting assembly 70 to achieve the axial limiting of the central shaft 50.

[0061] In some embodiments, the first limiting assembly 60 includes a positioning bushing 61, a second flange 610 provided at one end of the positioning bushing 61, and a lubricating gasket 62 provided on the inner side of the second through hole 401, the first stepped shaft 51 passes through the positioning bushing 61, the first flange 53 of the first stepped shaft 51 abuts against the second flange 610, and the edge of the end of the first stepped shaft 51 away from the first flange 53 abuts against the lubricating gasket 62.

[0062] It can be understood that the radial limiting of the first stepped shaft 51 can be achieved by matching the first limiting assembly 60 with the first stepped shaft 51 in a radial gap.

[0063] In some embodiments, the second limiting assembly 70 includes a lock washer 71 and a nut 72, the second stepped shaft 52 of the central shaft 50 passes through the second through hole 401 and the lock washer 71, and the nut 72 is used to lock the second stepped shaft 52.

[0064] It can be understood that the axial displacement of the central shaft 50 can be limited by locking the second stepped shaft 52 by the second limiting assembly 70, thereby achieving the axial limiting of the central shaft 50.

[0065] Further, since the second stepped shaft 52 is locked in the second through hole 401, the second through hole 401 can also be shielded by the second stepped shaft 52 to prevent dust from entering the inside of the modular joint assembly 20 through the second through hole 401, thereby playing a dustproof role.

[0066] It can be understood that the first joint seat 30 and the second joint seat 40 are connected by the middle shaft 50, and the through holes of the first joint seat 30 and the second joint seat 40 are shielded by the middle shaft 50, which can realize the closed design of the modular joint assembly 20 to seal the torsion spring 501 and other parts inside the modular joint assembly 20.

[0067] Specifically, please refer to Figures 6-10 , Figure 6 is Figure 2 the front view of the modular joint assembly, Figure 7 is Figure 2 the rear view of the modular joint assembly, Figure 8 is Figure 2 the right view of the modular joint assembly, Figure 9 is Figure 2 the left view of the modular joint assembly, Figure 10 is Figure 2 the bottom view of the modular joint assembly. Since the top view and the bottom view of the modular joint assembly 20 are Figure 1 similar, only the bottom view is shown here.

[0068] In this embodiment, from each view, it can be seen that no internal parts (including the torsion spring 501) are exposed at each angle, and only threaded holes and nuts can be seen from the rear view.

[0069] In the related art, the middle joint of the projection screen is generally open, and the torsion spring or the tension spring is exposed, which not only affects the appearance, but also causes the exposed torsion spring to rust and rub off the powder after a long time of work, which is not suitable for vehicle-mounted environment.

[0070] However, in this embodiment, since the rear surface of the modular joint assembly 20 is opposite to the back surface of the curtain and the distance is relatively close, it can be hidden in the overall curtain assembly to avoid the exposed threaded holes and nuts affecting the appearance of the vehicle-mounted curtain, thereby improving the overall appearance of the lifting assembly 100.

[0071] Further, the embodiment can reduce the probability of rusting and powder loss of the torsion spring 501 by enclosing the torsion spring 501 inside the modular joint assembly 20, thereby prolonging the service life of the torsion spring 501. At the same time, since the modular joint assembly 20 is a closed design, it can also play a certain dustproof role, thereby further prolonging the service life of the modular joint assembly 20, and then improving the overall stability and reliability of the lifting assembly 100.

[0072] With reference to Figure 3 and Figure 11 , Figure 11 is Figure 3 a schematic diagram of the swing amount of the modular joint assembly in the embodiment, wherein the first cylinder 31 and the first limiting assembly 60 (the positioning bushing 61 and the lubricating gasket 62) form a combination 80.

[0073] Specifically, the swing amount of the modular joint assembly 20 mainly depends on the cooperation tolerance relationship between the middle shaft 50 and the first limiting assembly 60. In the embodiment, by controlling the radial cooperation gap of the first limiting assembly 60 and the first cylinder 31 to be within 0.2 mm and the axial gap to be within 0.8 mm (7.2 mm-6.5 mm), the unilateral swing amount of the arm rod can be controlled to be within 1.7°, thereby improving the stability of the lifting assembly 100.

[0074] In some embodiments, based on the support requirements of the vehicle-mounted curtain and the process level, the radial cooperation gap and the axial gap can also be adjusted for reasonable tolerance distribution.

[0075] In some embodiments, by forming an interleaved structure of the first arm rod 11 and the second arm rod 12 with the modular joint assembly 20, the unilateral swing amount can be further reduced, thereby further improving the stability of the lifting assembly 100.

[0076] With reference to Figure 2 , Figure 12 , Figure 13 and Figure 14 , Figure 12 is Figure 2 a cross-sectional structure schematic diagram of the second embodiment of the modular joint assembly in the embodiment, Figure 13 is Figure 12 an exploded structure schematic diagram of the modular joint assembly in the embodiment, Figure 14 is Figure 13 an exploded structure schematic diagram of the modular joint assembly after rotating 180 degrees in the embodiment.

[0077] In the embodiment, the lifting assembly 100 comprises a first arm rod 11, a second arm rod 12 and a modular joint assembly 20. The first arm rod 11 and the second arm rod 12 are rotatably connected through the modular joint assembly 20. The two ends of the modular joint assembly 20 are respectively detachably connected with the first arm rod 11 and the second arm rod 12.

[0078] In the embodiment, the modular joint assembly 20 comprises a first joint seat 30 and a second joint seat 40. The first joint seat 30 and the second joint seat 40 are connected to form a containing space. A middle shaft 50 and a torsion spring 501 are arranged in the containing space. The torsion spring 501 is nested on the middle shaft 50, and the two ends of the torsion spring 501 are respectively connected with the first joint seat 30 and the second joint seat 40.

[0079] In the embodiment, the end of the first joint seat 30 away from the second joint seat 40 is connected with the first arm rod 11, and the end of the second joint seat 40 away from the first joint seat 30 is connected with the second arm rod 12.

[0080] In the embodiment, the first joint seat 30 comprises a first cylinder 31 and a first connecting arm 32 connected with each other, and the second joint seat 40 comprises a second cylinder 41 and a second connecting arm 42 connected with each other. The first cylinder 31 and the second cylinder 41 are matched to connect the first joint seat 30 and the second joint seat 40.

[0081] Hereinafter, only the parts different from the first embodiment will be described.

[0082] In the embodiment, the middle part of the first cylinder 31 is provided with the middle shaft 50. The middle shaft 50 comprises a first shaft body 511, a second shaft body 512 and a third shaft body 513. The diameter of the first shaft body 511 is greater than that of the second shaft body 512, and the diameter of the second shaft body 512 is greater than that of the third shaft body 513. The middle part of the second cylinder 41 is provided with a third through hole 403 and a fourth through hole 404 connected with each other. The fourth through hole 404 is close to the first cylinder. The diameter of the fourth through hole 404 is greater than that of the second shaft body 512 and smaller than that of the first shaft body 511. The diameter of the third through hole 403 is greater than that of the third shaft body 513 and smaller than that of the second shaft body 512. The middle shaft 50 penetrates through the fourth through hole 404 and the third through hole 403 to connect the first joint seat 30 and the second joint seat 40.

[0083] It can be understood that the diameter of the first shaft body 511 is greater than the diameter of the second shaft body 512, and the diameter of the fourth through hole 404 is greater than the diameter of the second shaft body 512 and less than the diameter of the first shaft body 511, so that the first shaft body 511 abuts against the second barrel 41 on the side of the fourth through hole 404. At the same time, the diameter of the third through hole 403 is greater than the diameter of the third shaft body 513 and less than the diameter of the second shaft body 512, so that the second shaft body 512 abuts against the second barrel 41 on the side of the third through hole 403 after passing through the fourth through hole 404, and only the third shaft body 513 is allowed to pass through the third through hole 403, thereby achieving axial positioning of the central shaft 50.

[0084] Further, since the side surface of the first barrel 31 away from the second barrel 41 is a complete surface, the fourth through hole 404 can be shielded by the first barrel 31 to prevent dust from entering the inside of the modular joint assembly 20 through the side of the first barrel 31, thereby playing a dustproof role.

[0085] In some embodiments, the third through hole 403 can be a flat position, and the third shaft body 513 is a flat position shaft to cooperate with the third through hole 403, thereby achieving circumferential positioning of the central shaft 50.

[0086] In the present embodiment, the first shaft body 511 is sleeved with the first bearing 81 on the outside, the second shaft body 512 is sleeved with the sleeve 83 on the outside of the end close to the first shaft body 511, and the second shaft body 512 is sleeved with the second bearing 82 on the outside of the end close to the third shaft body 513.

[0087] It can be understood that by using the first bearing 81, the second bearing 82 and the sleeve 83 to replace the positioning bushing 61 and the lubricating gasket 62, the movement mode of the rotating pair can be changed from sliding friction to rolling friction, so as to further reduce the fitting gap between parts, thereby further reducing the amount of shaking. And because of the double bearing arrangement, the unilateral shaking amount of the arm rod can be controlled within 0.5°, thereby further improving the stability of the lifting assembly 100.

[0088] In the present embodiment, the third limiting assembly 90 is arranged on the outside of the third through hole 403, and the third shaft body 513 of the central shaft 50 passes through the third through hole 403 and cooperates with the third limiting assembly 90 to achieve axial positioning of the central shaft 50.

[0089] In some embodiments, the third limiting assembly 90 includes a flat gasket 91, an elastic gasket 92 and a nut 72, the second shaft body 512 of the central shaft 50 abuts against the flat gasket 91, the third shaft body 513 of the central shaft 50 passes through the third through hole 403 and cooperates with the elastic gasket 92, and the nut 72 is used to lock the third shaft body 513.

[0090] It can be understood that the third shaft body 513 is locked by the third limiting assembly 90, the displacement of the central shaft 50 in the axial direction is limited, and the axial limiting of the central shaft 50 is realized.

[0091] Further, since the third shaft body 513 is locked in the third through hole 403, the third through hole 403 can also be shielded by the third shaft body 513 to prevent dust from entering the inside of the modular joint assembly 20 through the third through hole 403, thereby playing a dustproof role.

[0092] The application provides a projection screen device.

[0093] Please refer to Figure 15 , Figure 15 is a structural schematic diagram of the projection screen device of the application.

[0094] In the embodiment, the projection screen device 200 comprises a first cover 201 and a second cover 202 arranged oppositely, a screen body 203, and the lifting assembly 100 as described above. The first side edge of the screen body 203 is connected with the first cover 201, and the second side edge of the screen body 203 is connected with the second cover 202. The first side edge and the second side edge are arranged oppositely. One end of the first arm rod 11 of the lifting assembly 100 is connected with the first cover 201, the other end of the first arm rod 11 is connected with the modular joint assembly 20, one end of the second arm rod 12 is connected with the modular joint assembly 20, and the other end of the second arm rod 12 is connected with the second cover 202.

[0095] The projection screen device 200 comprises two groups of symmetrical lifting assemblies arranged at the third side edge and the fourth side edge of the screen body 203, and the third side edge is perpendicular to the first side edge.

[0096] It can be understood that since the modular joint assembly 20 can improve the overall appearance, reliability and stability of the lifting assembly 100, the support performance of the lifting assembly 100 to the screen body 203 can be improved, the shaking amount of the screen body 203 is reduced, and the safety and stability of the screen body 203 are improved.

[0097] Different from the related art, the application provides a lifting assembly and a projection screen device. The intermediate joint is modularly designed, the intermediate joint and the screen arm rod can be independently prepared, the preparation difficulty of the lifting assembly is reduced, and the preparation efficiency of the lifting assembly is improved. Further, the two ends of the modular joint assembly are detachably connected with the first arm rod and the second arm rod, respectively, which is conducive to the installation and disassembly of the lifting assembly. When the modular joint assembly fails, the lifting assembly can be quickly repaired by disassembling and replacing the modular joint assembly, so as to reduce the installation cost and maintenance cost of the lifting assembly, and then improve the reliability of the lifting assembly.

[0098] The above merely provides the implementation of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation made by using the content of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A lift assembly, comprising: Comprise: A first arm rod; A second arm rod; A modular joint assembly, the first arm rod and the second arm rod are rotatably connected through the modular joint assembly; wherein two ends of the modular joint assembly are respectively detachably connected with the first arm rod and the second arm rod.

2. The lifting assembly according to claim 1, characterized in that, The modular joint assembly comprises a first joint seat and a second joint seat, the first joint seat and the second joint seat are connected to form a containing space, a middle shaft and a torsion spring are arranged in the containing space; the torsion spring is nested on the middle shaft, and two ends of the torsion spring are respectively connected with the first joint seat and the second joint seat; The end of the first joint seat away from the second joint seat is connected with the first arm rod, and the end of the second joint seat away from the first joint seat is connected with the second arm rod.

3. The lifting assembly according to claim 2, characterized in that, The first joint seat comprises a first cylinder and a first connecting arm connected with each other, and the second joint seat comprises a second cylinder and a second connecting arm connected with each other; Wherein, the first cylinder and the second cylinder cooperate to connect the first joint seat and the second joint seat; the first connecting arm is connected with the first arm rod, and the second connecting arm is connected with the second arm rod.

4. The lifting assembly according to claim 3, characterized in that, The first cylinder is provided with a first matching part, and is provided with a first containing cavity in an axial direction; the second cylinder is provided with a second matching part, and is provided with a second containing cavity in the axial direction; the axial direction is the length extension direction of the middle shaft; Wherein, the first matching part and the second matching part are connected to cooperate the first cylinder and the second cylinder to connect the first joint seat and the second joint seat, and the first containing cavity and the second containing cavity form the containing space; one end of the torsion spring is fixedly connected with the first cylinder, and the other end of the torsion spring is fixedly connected with the second cylinder.

5. The lifting assembly according to claim 4, characterized in that, The middle part of the first cylinder is provided with a first through hole, and the middle part of the second cylinder is provided with a second through hole; the first through hole and the second through hole are concentrically arranged, and the second through hole is a flat position; The middle shaft comprises a first stepped shaft and a second stepped shaft, the diameter of the first stepped shaft is greater than the diameter of the second stepped shaft; the first stepped shaft is provided with a first flange at the end away from the second stepped shaft, and the diameter of the first flange is greater than the diameter of the first through hole; the second stepped shaft is a flat position at the end away from the first stepped shaft; The middle shaft passes through the first through hole and the second through hole, and the flat position of the middle shaft and the flat position of the second through hole are matched to connect the first joint seat and the second joint seat.

6. The lifting assembly according to claim 5, characterized in that, A first limiting assembly is arranged on the periphery of the first through hole, and the first stepped shaft of the middle shaft penetrates through the first limiting assembly to gap-fit with the first cylinder body through the first limiting assembly; A second limiting assembly is arranged on the outer side of the second through hole, and the second stepped shaft of the middle shaft penetrates through the second through hole and cooperates with the second limiting assembly to axially limit the middle shaft.

7. The lifting assembly according to claim 6, characterized in that, The first limiting assembly comprises a positioning bushing, a second flange arranged at one end of the positioning bushing, and a lubricating gasket arranged on the inner side of the second through hole, the first stepped shaft penetrates through the positioning bushing, the first flange of the first stepped shaft abuts against the second flange, and the edge of the end of the first stepped shaft away from the first flange abuts against the lubricating gasket; The second limiting assembly comprises a lock washer and a nut, the second stepped shaft of the middle shaft penetrates through the second through hole and the lock washer, and the nut is used for locking the second stepped shaft.

8. The lifting assembly according to claim 4, characterized in that, The middle part of the first cylinder body is provided with the middle shaft, the middle shaft comprises a first shaft body, a second shaft body and a third shaft body, the diameter of the first shaft body is greater than that of the second shaft body, and the diameter of the second shaft body is greater than that of the third shaft body; The middle part of the second cylinder body is provided with a third through hole and a fourth through hole connected in sequence, the fourth through hole is arranged close to the first cylinder body, the diameter of the fourth through hole is greater than that of the second shaft body and smaller than that of the first shaft body, and the diameter of the third through hole is greater than that of the third shaft body and smaller than that of the second shaft body; The middle shaft penetrates through the fourth through hole and the third through hole to connect the first joint seat and the second joint seat.

9. The lifting assembly according to claim 8, characterized in that, The outer side of the first shaft body is sleeved with a first bearing, the outer side of one end of the second shaft body close to the first shaft body is sleeved with a sleeve, and the outer side of one end of the second shaft body close to the third shaft body is sleeved with a second bearing; The outer side of the third through hole is provided with a third limiting assembly, and the third shaft body of the middle shaft penetrates through the third through hole and cooperates with the third limiting assembly to axially limit the middle shaft.

10. A projection screen device, characterized by The curtain assembly comprises oppositely arranged first and second cover bodies, a curtain body, and the lifting assembly according to any one of claims 1-9; The first side edge of the curtain body is connected with the first cover body, the second side edge of the curtain body is connected with the second cover body, the first side edge and the second side edge are oppositely arranged, one end of the first arm lever of the lifting assembly is connected with the first cover body, the other end of the first arm lever is connected with the modular joint assembly, one end of the second arm lever is connected with the modular joint assembly, and the other end of the second arm lever is connected with the second cover body.

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