Corner fixture and display unit

Abstract

The present invention relates to a corner fixing device and a display screen unit, comprising a mounting base, a corner protection assembly and a connecting rod assembly, wherein one end of the connecting rod assembly is rotatably connected to the mounting base, and the other end is connected to the corner protection assembly, the corner protection assembly has an assembly position and a separation position, when the corner protection assembly is in the assembly position, the corner protection assembly is arranged around the fixed part, when the corner protection assembly is in the separation position, the corner protection assembly is separated from the fixed part, the corner protection assembly moves from the separation position to the assembly position and drives the connecting rod assembly to rotate along a first circumferential direction on the mounting base, so that the corner protection assembly is arranged around the fixed part or separated from the fixed part under the guidance of the connecting rod assembly; when the corner protection assembly reaches the assembly position, the operating part can fix the corner protection assembly, so that the corner protection assembly can be effectively arranged around the fixed part and the corner protection assembly can be fixed in the assembly position, thereby improving the protection effect.

Description

Technical Field

[0001] The present invention relates to the field of electronic display technology, and in particular to a corner fixing device and a display screen unit. Background Art

[0002] With the continuous development of society, LED display screens are increasingly widely used in commercial media, cultural performance markets, sports stadiums, information dissemination, news releases, and securities trading to meet the needs of different environments. As a thin and easy-to-use display screen, LED display screens need to be disassembled and transported during installation.

[0003] During the disassembly and transportation process, the display screen is prone to bumps, especially the four corners of the LED display screen are most susceptible to damage. In order to prevent the four corners of the LED display screen from being damaged, the general protection operation is to directly put the corner protection devices on the four corners before disassembly and transportation.

[0004] However, this type of protection lacks stability during disassembly or transportation, resulting in poor protection effect. Summary of the invention

[0005] Based on this, it is necessary to provide a corner fixing device and a display screen unit with better corner protection effect to address the problem that the corner protection device has poor protection effect.

[0006] A corner fixing device, used for protecting the corner position of a fixed part, comprises:

[0007] Install the base and corner guard assembly;

[0008] A connecting rod assembly, one end of which is rotatably connected to the mounting base, and the other end of which is connected to the corner guard assembly;

[0009] A corner protection assembly, wherein the corner protection assembly has an assembly position and a separation position; when the corner protection assembly is in the assembly position, the corner protection assembly is disposed around the fixed member, and when the corner protection assembly is in the separation position, the corner protection assembly is separated from the fixed member; and

[0010] An operating member, the operating member is connected to the corner guard assembly, and the operating member is used to fix the corner guard assembly when the corner guard assembly reaches the separation position or the assembly position;

[0011] Wherein, the corner protection assembly can move from the separation position to the assembly position and drive the connecting rod assembly to rotate along the first circumferential direction on the mounting base.

[0012] In one of the embodiments, the corner protection assembly is rotatably connected to an end of the connecting rod assembly away from the mounting base.

[0013] In one embodiment, the connecting rod assembly includes at least two connecting rods spaced apart from each other along a first direction and mounted on the mounting base, each connecting rod extending along a second direction, and opposite ends of each connecting rod being rotatably connected to the mounting base and the corner guard assembly respectively;

[0014] Wherein, the corner protection assembly can drive all the connecting rods to rotate synchronously along a first circumferential direction on the mounting base, and the first direction intersects with the second direction.

[0015] In one embodiment, the corner fixing device further comprises an elastic reset member, and opposite ends of the elastic reset member are respectively connected to the connecting rod assembly and the mounting base;

[0016] When the corner guard assembly moves from the separation position to the assembly position, the elastic reset member stores a first elastic force that enables the connecting rod assembly to drive the corner guard assembly to return to the separation position;

[0017] When the corner protection assembly moves from the assembly position to the separation position, the connecting rod assembly rotates in a direction opposite to the first circumferential direction under the action of the first elastic force to drive the corner protection assembly to move to the separation position.

[0018] In one embodiment, the elastic return member is a torsion spring, the torsion spring has a first connection end, a second connection end and a torsion spring action section, the first connection end and the second connection end are respectively connected to opposite ends of the torsion spring action section, the first connection end is fixedly connected to one of the connecting rods, and the second connection end is fixedly abutted against the mounting base;

[0019] When the connecting rod rotates from the separation position to the assembly position, the connecting rod can drive the first connection end to move synchronously so that the torsion spring action section generates the first elastic force;

[0020] When the connecting rod rotates from the assembly position to the separation position, the first connecting end drives the connecting rod to rotate in a direction opposite to the first circumferential direction under the action of the first elastic force.

[0021] In one of the embodiments, the corner fixing device further comprises a mounting frame, and the mounting base is disposed in the mounting frame;

[0022] When the corner protection assembly reaches the separation position or the assembly position, the operating member can rotate relative to the corner protection assembly to be engaged with the mounting frame.

[0023] In one embodiment, the mounting frame is provided with a first buckling groove and a second buckling groove; the operating member includes a first buckling portion and a second buckling portion, and the first buckling portion and the second buckling portion are arranged at a certain angle;

[0024] When the corner protection assembly is in the assembly position, the first buckling portion is buckled in the first buckling groove, and when the corner protection assembly is in the separation position, the second buckling portion is buckled in the second buckling groove.

[0025] In one embodiment, the corner fixing device further includes a compression spring member, the operating member further includes a body, and the first buckling portion and the second buckling portion are both connected to the body;

[0026] Wherein, the compression spring member is arranged between the main body and the corner guard assembly, and the compression spring member can apply a second elastic force to the main body to make the main body rotate relative to the corner guard assembly, so that the first snap-fitting part is snapped into the first snap-fitting groove or the second snap-fitting part is snapped into the second snap-fitting groove.

[0027] In one embodiment, when the corner guard assembly moves between the separation position and the assembly position, the compression spring member stores the second elastic force capable of causing the first buckling portion to buckle into the first buckling groove or causing the second buckling portion to buckle into the second buckling groove;

[0028] When the corner protection assembly is in the assembly position, the first buckling portion is buckled in the first buckling groove under the action of the second elastic force;

[0029] When the corner protection assembly is in the separated position, the second buckling portion is buckled in the second buckling groove under the action of the second elastic force.

[0030] According to another aspect of the present application, a display screen unit is provided, comprising a fixed part and the corner fixing device provided in any one of the above embodiments, wherein the corner protection assembly can be fixed at the corner of the fixed part, and the fixed part is a display screen.

[0031] The above-mentioned corner fixing device is used to protect the corner positions of the fixed parts, and includes a mounting base, a corner guard assembly and a connecting rod assembly. One end of the connecting rod assembly is rotatably connected to the mounting base, and the other end is connected to the corner guard assembly. The corner guard assembly has an assembly position and a separation position. When the corner guard assembly is in the assembly position, the corner guard assembly is surrounded on the fixed part. When the corner guard assembly is in the separation position, the corner guard assembly is separated from the fixed part. The corner guard assembly moves from the separation position to the assembly position and drives the connecting rod assembly to rotate along the first circumferential direction on the mounting base, so that the corner guard assembly is surrounded on the fixed part or separated from the fixed part under the guidance of the connecting rod assembly; when the corner guard assembly reaches the assembly position, the operating part can fix the corner guard assembly, so that the corner guard assembly can be effectively surrounded on the fixed part and the corner guard assembly can be fixed in the assembly position, thereby improving the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 An exploded schematic diagram of a corner fixing device provided by an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram of the structure of the operating member provided by the corner fixing device shown in ;

[0034] Figure 3 for Figure 1 A schematic diagram of the structure of removing the corner guard assembly when the corner guard assembly is in the separated position;

[0035] Figure 4 for Figure 1 A schematic cross-sectional structural diagram of the corner fixing device shown in the first perspective when the corner protection assembly is in a separated position;

[0036] Figure 5 for Figure 1 A schematic diagram of the structure of the corner fixing device shown in FIG. 1 for removing the corner guard assembly when the corner guard assembly is in the assembly position;

[0037] Figure 6 for Figure 1 A schematic diagram of the structure of the corner fixing device shown in when the corner protection assembly is in the assembly position;

[0038] Figure 7 for Figure 1 A schematic cross-sectional structural diagram of the corner fixing device shown in the figure when the corner protection assembly is in the assembly position from a second viewing angle;

[0039] Figure 8 for Figure 1 The corner fixing device shown in the figure is a schematic cross-sectional structural diagram from a third perspective when the corner protection assembly is in the assembly position.

[0040] : Illustrations: 100, corner fixing device; 10, mounting base; 11, mounting groove; 12, mounting hole; 20, connecting rod assembly; 21, connecting rod; 211, first connecting hole; 212, second connecting hole; 30, corner protection assembly; 40, operating member; 41, main body; 42, first buckling portion; 43, second buckling portion; 44, operating portion; 45, compression spring clamping point; 50, pin connector; 60, elastic reset member; 61, torsion spring; 611, first connecting end; 612, torsion spring action section; 613, second connecting end; 70, mounting frame; 71, first buckling groove; 72, second buckling groove; 73, base mounting groove; 80, compression spring member; 200, fixed member. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0042] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0047] Combined with Figures 1 to 3 As shown, a corner fixing device 100 according to an embodiment of the present invention is applied to a display screen. It is understandable that in other embodiments, the corner fixing device 100 can also be applied to other fixed parts that need to be provided with the corner fixing device 100, which is not limited here.

[0048] The corner fixing device 100 provided in this embodiment includes a mounting base 10, a connecting rod assembly 20, a corner protection assembly 30 and an operating member 40. One end of the connecting rod assembly 20 is rotatably connected to the mounting base 10 and can rotate relative to the mounting base 10, and the other end is connected to the corner protection assembly 30. The operating member 40 is connected to the corner protection assembly 30; the corner protection assembly 30 has an assembly position and a separation position. When the corner protection assembly 30 is in the assembly position, the corner protection assembly 30 is arranged around the fixed part. When the corner protection assembly 30 is in the separation position, the corner protection assembly 30 is separated from the fixed part; the corner guard assembly 30 can move from the separation position to the assembly position and drive the connecting rod assembly 20 to rotate along the first circumferential direction on the mounting base 10, so that the corner guard assembly 30 is surrounded on the fixed part or separated from the fixed part under the guidance of the connecting rod assembly 20; when the corner guard assembly 30 reaches the assembly position or the separation position, the operating member 40 can fix the corner guard assembly 30, so that the corner guard assembly 30 can be effectively surrounded on the fixed part 200 and fixed in the assembly position, thereby improving the protection effect.

[0049] In one embodiment, the mounting base 10 has a mounting groove 11 extending along a first direction, and a plurality of mounting holes 12 are formed through the wall of the mounting groove 11. The connecting rod assembly 20 is placed in the mounting groove 11, and a pin connector 50 passes through the mounting hole 12, the connecting rod assembly 20, and the mounting hole 12 formed on the wall of the mounting groove 11 on the other side, so that the connecting rod assembly 20 is rotatably connected to the mounting groove 11 of the mounting base 10.

[0050] like Figure 4 and Figure 5 As shown, in one of the embodiments, the corner guard assembly 30 is rotatably connected to one end of the connecting rod assembly 20 away from the mounting base 10, so that when the corner guard assembly 30 moves from the separation position to the assembly position under the guidance of the connecting rod assembly 20, the corner guard assembly 30 can swing on the connecting rod assembly 20 to adjust the angle, thereby avoiding unnecessary tilting or angle deflection of the corner guard assembly 30, and ensuring that the corner guard assembly 30 can be more conveniently and stably arranged on the fixed component 200.

[0051] Furthermore, the connecting rod assembly 20 includes at least two connecting rods 21 installed on the mounting base 10 at intervals along a first direction, each connecting rod 21 extends along a second direction, the first direction intersects with the second direction, and the opposite ends of each connecting rod 21 are rotatably connected to the mounting base 10 and the corner guard assembly 30, respectively, so that one connecting rod 21 forms an active rod and the remaining connecting rods 21 form driven rods. The corner guard assembly 30 can drive all the connecting rods 21 to rotate synchronously in the same direction along the first circumferential direction on the mounting base 10, so as to form the connecting rod assembly 20 for motion transformation and power transmission, and conveniently guide the long-distance transmission of the corner guard assembly 30.

[0052] Specifically, a first connecting hole 211 and a second connecting hole 212 are formed at opposite ends of each connecting rod 21. A pin connector 50 can be passed through the first connecting hole 211 to fix the pin connector 50 on the corner protection assembly 30, and the connecting rod 21 can rotate circumferentially around the pin connector 50; another pin connector 50 is passed through the mounting hole 12 and the second connecting hole 212 to rotatably connect the connecting rod 21 to the mounting base 10, and the connecting rod 21 can also rotate circumferentially around this pin connector 50, so that the connecting rod 21 can rotate relative to the mounting base 10, and the corner protection assembly 30 can rotate relative to the connecting rod 21.

[0053] Preferably, the number of connecting rods 21 can be two, and the two connecting rods 21 and the corner guard assembly 30 are rotationally connected to form a double crank transmission. The two connecting rods 21 rotate synchronously in the same direction, and one end of the two connecting rods 21 is rotatably connected to the corner guard assembly 30. The corner guard assembly 30 is driven to move synchronously through the double crank transmission mechanism, so that the corner guard assembly 30 is always supported by the two connecting rods 21 during the movement, and the corner guard assembly 30 is transmitted from the separation position to the assembly position under the guidance of the connecting rod 21, and the corner guard assembly 30 is always kept in translation during the transmission process. The operation is simple and very convenient.

[0054] Furthermore, the corner fixing device 100 provided in this embodiment also includes a mounting frame 70, which is fixedly arranged relative to the fixed part, and the mounting base 10 is arranged in the mounting frame 70; when the corner guard assembly 30 reaches the separation position or the assembly position, the operating member 40 can be rotated relative to the corner guard assembly 30 to engage with the mounting frame 70, thereby locking the position of the corner guard assembly 30 and maintaining stable separation or assembly between the corner guard assembly 30 and the fixed part 200.

[0055] Specifically, see Figure 2 The operating member 40 includes a main body 41, a first buckling portion 42 and a second buckling portion 43. The first buckling portion 42 and the second buckling portion 43 are both connected to the main body 41 and are arranged at a certain angle. The main body 41 and the corner protection assembly 30 are rotatably connected so that the first buckling portion 42 or the second buckling portion 43 is buckled on the mounting frame 70; when the corner protection assembly 30 is in the assembly position, the main body 41 rotates relative to the corner protection assembly 30 so that the first buckling portion 42 is buckled on the mounting frame 70; when the corner protection assembly 30 is in the separation position, the main body 41 rotates relative to the corner protection assembly 30 so that the second buckling portion 43 is buckled on the mounting frame 70, thereby locking the position of the corner protection assembly 30.

[0056] In one embodiment, an operating part 44 is further provided on the operating member 40, and the operating part 44 is connected to the main body 41. The operating part 44 can drive the main body 41 to rotate relative to the corner guard assembly 30 under the action of external force so that the first buckling part 42 or the second buckling part 43 is buckled on the mounting frame 70. The operating part 44 can also drive the main body 41 to rotate relative to the corner guard assembly 30 under the action of external force so that the buckling relationship between the first buckling part 42 or the second buckling part 43 and the mounting frame 70 is cancelled.

[0057] In one embodiment, a first snap-fitting groove 71 and a second snap-fitting groove 72 are provided on the mounting frame 70, the first snap-fitting groove 71 is provided on a side of the mounting frame 70 close to the fixed part 200, and the second snap-fitting groove 72 is provided on a side of the mounting frame 70 away from the fixed part 200, the body 41 and the corner protection assembly 30 are rotatably connected so that the first snap-fitting portion 42 is snap-fitted to the first snap-fitting groove 71 or the second snap-fitting portion 43 is snap-fitted to the second snap-fitting groove 72; when the corner protection assembly 30 moves toward the side close to the fixed part 200 to reach the assembly position, The main body 41 rotates relative to the corner guard assembly 30, and the first snap-fitting portion 42 snaps into the first snap-fitting groove 71 to fix the corner guard assembly 30. At this time, the corner guard assembly 30 is in an extended state; when the corner guard assembly 30 moves to the side away from the fixed part and reaches the separation position, the main body 41 rotates relative to the corner guard assembly 30, and the second snap-fitting portion 43 snaps into the second snap-fitting groove 72 to fix the corner guard assembly 30. At this time, the corner guard assembly 30 is in a retracted state; thereby, the automatic movement of the corner guard assembly 30 can be achieved while the state can be locked.

[0058] Furthermore, a base installation groove 73 is provided on the installation frame 70, and the installation base 10 is fixedly installed in the base installation groove 73, and the connecting rod assembly 20 is assembled on the side of the installation base 10 away from the groove wall of the base installation groove 73 for rotation.

[0059] In one embodiment, the corner fixing device 100 also includes an elastic reset member 60, and the opposite ends of the elastic reset member 60 are respectively connected to the connecting rod assembly 20 and the mounting base 10. When the corner guard assembly 30 moves from the separation position to the assembly position, the elastic reset member 60 stores a first elastic force that enables the connecting rod assembly 20 to drive the corner guard assembly 30 to return to the separation position; when the corner guard assembly 30 switches from the assembly position to the separation position, the connecting rod assembly 20 rotates in a direction opposite to the first circumferential direction under the action of the first elastic force to drive the corner guard assembly 30 to move to the separation position, thereby realizing automatic separation of the corner guard assembly 30 and the fixed member 200.

[0060] Furthermore, the elastic reset member 60 is a torsion spring 61, which has a first connection end 611, a torsion spring action section 612, and a second connection end 613. The first connection end 611 and the second connection end 613 are respectively connected to the opposite ends of the torsion spring action section 612. The first connection end 611 is fixedly connected to one of the connecting rods 21, so that the connecting rod 21 becomes an active rod, and the second connection end 613 abuts against the mounting base 10. When the connecting rod 21 rotates from the separation position to the assembly position, the connecting rod 21 can drive the first connection end 611 to rotate to the assembly position under the premise that the second connection end 613 is fixed. 11 The synchronous movement enables the torsion spring action section 612 to generate a first elastic force that can cause the connecting rod 21 to rebound at an angle. The first connecting end 611 can drive the connecting rod 21 to rotate in a direction opposite to the first circumferential direction under the action of the first elastic force, so that the connecting rod assembly 20 can automatically rotate under the action of the first elastic force, thereby driving the corner guard assembly 30 to reset and move from the assembly position to the separation position. The torsion spring 61 has sufficient plasticity and toughness, and can also mitigate impact and absorb vibration, thereby ensuring the effectiveness of the first elastic force while ensuring smooth reset of the corner guard assembly 30.

[0061] Specifically, Figures 6 to 8 As shown, when the corner guard assembly 30 is in the assembly position, the first snap-fit ​​portion 42 is snap-fitted into the first snap-fit ​​groove 71. At this time, the operating portion 44 can be pressed to remove the first snap-fit ​​portion 42 from the first snap-fit ​​groove 71. The connecting rod 21 is reset and rotated relative to the mounting base 10 under the action of the first elastic force, and drives the corner guard assembly 30 to move toward the separation side under the guidance of the connecting rod assembly 20. When the corner guard assembly 30 reaches the separation position, the operating portion 44 is released, and the compression spring member 80 can apply a second elastic force to make the operating member 40 rotate relative to the corner guard assembly 30, thereby snapping the second snap-fit ​​portion 43 into the second snap-fit ​​groove 72.

[0062] In one embodiment, the corner fixing device 100 provided in this embodiment also includes a compression spring member 80, which is arranged between the main body 41 and the corner protection assembly 30, and can apply a second elastic force to the main body 41 to enable the main body 41 to rotate relative to the corner protection assembly 30, and snap the first snapping portion 42 into the first snapping groove 71 or snap the second snapping portion 43 into the second snapping groove 72, so as to automatically fix the position of the corner protection assembly 30.

[0063] Furthermore, a compression spring clamping point 45 is provided on the main body 41, and one end of the compression spring member 80 is clamped on the compression spring clamping point 45, so that the compression spring member 80 is limited by the compression spring clamping point 45 to avoid position or angle deviation of the compression spring member 80 when elastic force is applied.

[0064] Specifically, when the corner guard assembly 30 moves between the separation position and the assembly position, the compression spring member 80 stores a second elastic force that enables the first snap-fitting portion 42 to snap into the first snap-fitting groove 71 or the second snap-fitting portion 43 to snap into the second snap-fitting groove 72; when the corner guard assembly 30 is in the assembly position, the first snap-fitting portion 42 snaps into the first snap-fitting groove 71 under the action of the second elastic force; when the corner guard assembly 30 is in the separation position, the second snap-fitting portion 43 snaps into the second snap-fitting groove 72 under the action of the second elastic force, thereby achieving automatic fixation of the position of the corner guard assembly 30.

[0065] According to another aspect of the present application, a display screen unit is provided, including a fixed part 200 and a corner fixing device 100 provided in any one of the above embodiments, wherein the corner protection assembly 30 can be fixed at the corner of the fixed part 200, and the fixed part 200 is a display screen.

[0066] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A corner fixing device for protecting the corner position of a fixed part, characterized in that: include: Install the base and corner guard assembly; A connecting rod assembly, one end of which is rotatably connected to the mounting base, and the other end of which is connected to the corner guard assembly; A corner protection assembly, wherein the corner protection assembly has an assembly position and a separation position; when the corner protection assembly is in the assembly position, the corner protection assembly is arranged around the fixed member, and when the corner protection assembly is in the separation position, the corner protection assembly is separated from the fixed member; as well as An operating member, the operating member is connected to the corner guard assembly, and the operating member is used to fix the corner guard assembly when the corner guard assembly reaches the separation position or the assembly position; Wherein, the corner guard assembly can move from the separation position to the assembly position and drive the connecting rod assembly to rotate along the first circumferential direction on the mounting base; The corner fixing device further comprises a mounting frame, wherein the mounting base is arranged in the mounting frame; when the corner guard assembly reaches the separation position or the assembly position, the operating member can rotate relative to the corner guard assembly to engage with the mounting frame; The mounting frame is provided with a first buckling groove and a second buckling groove; The operating member includes a body, a first buckling portion and a second buckling portion, the first buckling portion and the second buckling portion are both connected to the body, the first buckling portion and the second buckling portion are arranged at a certain angle, the body and the corner protection assembly are rotatably connected so that the first buckling portion or the second buckling portion is buckled on the mounting frame; when the corner protection assembly is in the assembly position, the first buckling portion is buckled in the first buckling groove, and when the corner protection assembly is in the separation position, the second buckling portion is buckled in the second buckling groove; The operating member is also provided with an operating portion, which is connected to the main body. The operating portion is arranged outside the corner protection assembly, and the main body is arranged inside the corner protection assembly.

2. The corner fixing device according to claim 1, characterized in that: The corner protection assembly is rotatably connected to an end of the connecting rod assembly away from the mounting base.

3. The corner fixing device according to claim 2, characterized in that: The connecting rod assembly includes at least two connecting rods spaced apart from each other along a first direction and mounted on the mounting base, each connecting rod extending along a second direction, and opposite ends of each connecting rod being rotatably connected to the mounting base and the corner guard assembly respectively; Wherein, the corner protection assembly can drive all the connecting rods to rotate synchronously and in the same direction along a first circumferential direction on the mounting base, and the first direction intersects with the second direction.

4. The corner fixing device according to claim 3, characterized in that: The corner fixing device further comprises an elastic reset member, and opposite ends of the elastic reset member are respectively connected to the connecting rod assembly and the mounting base; When the corner guard assembly moves from the separation position to the assembly position, the elastic reset member stores a first elastic force that enables the connecting rod assembly to drive the corner guard assembly to return to the separation position; When the corner protection assembly moves from the assembly position to the separation position, the connecting rod assembly rotates in a direction opposite to the first circumferential direction under the action of the first elastic force to drive the corner protection assembly to move to the separation position.

5. The corner fixing device according to claim 4, characterized in that: The elastic reset member is a torsion spring, and the torsion spring has a first connection end, a second connection end and a torsion spring action section, the first connection end and the second connection end are respectively connected to the opposite ends of the torsion spring action section, the first connection end is fixedly connected to one of the connecting rods, and the second connection end is fixedly abutted against the mounting base; When the connecting rod rotates from the separation position to the assembly position, the connecting rod can drive the first connection end to move synchronously so that the torsion spring action section generates the first elastic force; When the connecting rod rotates from the assembly position to the separation position, the first connecting end drives the connecting rod to rotate in a direction opposite to the first circumferential direction under the action of the first elastic force.

6. The corner fixing device according to claim 5, characterized in that: The corner fixing device also includes a compression spring member; Wherein, the compression spring member is arranged between the main body and the corner guard assembly, and the compression spring member can apply a second elastic force to the main body to make the main body rotate relative to the corner guard assembly, so that the first snap-fitting part is snapped into the first snap-fitting groove or the second snap-fitting part is snapped into the second snap-fitting groove.

7. The corner fixing device according to claim 6, characterized in that: When the corner guard assembly moves between the separation position and the assembly position, the compression spring member stores the second elastic force capable of causing the first buckling portion to buckle into the first buckling groove or causing the second buckling portion to buckle into the second buckling groove; When the corner protection assembly is in the assembly position, the first buckling portion is buckled in the first buckling groove under the action of the second elastic force; When the corner protection assembly is in the separated position, the second buckling portion is buckled in the second buckling groove under the action of the second elastic force.

8. A display screen unit, characterized in that: It comprises a fixed part and the corner fixing device as described in any one of claims 1 to 7, wherein the corner protection assembly can be fixed at the corner of the fixed part, and the fixed part is a display screen.

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