Anti-loosening corner connector for frame corner connection

Abstract

An anti-loosening corner connector for frame corner connection comprises a transverse insertion block top plate, the left end of the transverse insertion block top plate and the top end of a transverse insertion block vertical plate are connected into a whole, the bottom end of the transverse insertion block vertical plate and the left end of a transverse insertion block bottom plate are connected into a whole, and the right end of the transverse insertion block top plate and the top end of a transverse insertion block inclined plate are connected into a whole. The bottom end of the transverse insertion block inclined plate and the right end of the transverse insertion block bottom plate are connected into a whole, and the plate face of the transverse insertion block inclined plate is obliquely arranged. A transverse cavity is defined by the transverse insertion block top plate, the transverse insertion block vertical plate, the transverse insertion block bottom plate and the transverse insertion block inclined plate, a transverse jackscrew fixing plate is arranged in the transverse cavity, the left end or the right end of the transverse jackscrew fixing plate is fixedly connected with the inner wall of the transverse cavity through a lower inclined rib plate, and a transverse jackscrew is rotationally installed in the middle of the transverse jackscrew fixing plate. The utility model aims to provide the anti-loosening corner connector for connecting the corners of the frame, which has the advantages that the connected corners of the frame are very firm and do not loosen or deform, the connecting strength of the corners of the frame is high, the rigidity is high, and the working efficiency is high.

Description

Technical Field

[0001] The utility model relates to an anti-loosening angle code for connecting frame corners. Background Art

[0002] In order to connect two frame profiles that need to form a right triangle, the traditional installation method is to glue or connect them with fasteners such as screws. Such installation is not only time-consuming and labor-intensive, but also prone to loosening. In addition, there are also methods of connecting the corners of two frames with connectors, but the existing frame corner connectors are not reasonably designed, resulting in the connected frame corners being more likely to loosen and deform. Utility Model Content

[0003] The utility model aims to provide an anti-loosening angle code for connecting frame corners, which can make the connected frame corners very firm and has high connection strength and high rigidity.

[0004] The utility model provides an anti-loosening angle code for connecting frame corners, comprising a top plate of a horizontal plug-in block, the plate surface of the top plate of the horizontal plug-in block is located in a horizontal direction, the left end of the top plate of the horizontal plug-in block is connected to the top of the vertical plate of the horizontal plug-in block as a whole, the bottom end of the vertical plate of the horizontal plug-in block is connected to the left end of the bottom plate of the horizontal plug-in block as a whole, the plate surface of the bottom plate of the horizontal plug-in block is located in a horizontal direction, the right end of the top plate of the horizontal plug-in block is connected to the top of the inclined plate of the horizontal plug-in block as a whole, the bottom end of the inclined plate of the horizontal plug-in block is connected to the right end of the bottom plate of the horizontal plug-in block as a whole, and the plate surface of the inclined plate of the horizontal plug-in block is arranged obliquely;

[0005] The top plate of the horizontal plug block, the vertical plate of the horizontal plug block, the bottom plate of the horizontal plug block and the inclined plate of the horizontal plug block surround a horizontal cavity, a horizontal top screw fixing plate is provided in the horizontal cavity, the plate surface of the horizontal top screw fixing plate is located in the horizontal direction, the left end or the right end of the horizontal top screw fixing plate is fixedly connected to the inner wall of the horizontal cavity through the lower inclined rib plate, a horizontal top screw is screwed on the middle part of the horizontal top screw fixing plate, the axis of the horizontal top screw is located in the front and rear horizontal direction, and the horizontal top screw passes through the bottom plate of the horizontal plug block by a clearance fit;

[0006] The plate surface of the inclined plate of the horizontal plug block facing the upper right is attached to the surface of the middle connecting block facing the lower left, the surface of the middle connecting block facing the upper right is attached to the plate surface of the inclined plate of the vertical plug block facing the lower left, the plate surface of the inclined plate of the vertical plug block is inclined, the top end of the inclined plate of the vertical plug block is connected to the bottom end of the left plate of the vertical plug block as a whole, the plate surface of the left plate of the vertical plug block is located in the front-to-back vertical direction, the plate surface of the left plate of the vertical plug block is perpendicular to the plate surface of the top plate of the horizontal plug block, the top end of the left plate of the vertical plug block is connected to the left end of the top plate of the vertical plug block as a whole, the right end of the top plate of the vertical plug block is connected to the top end of the right plate of the vertical plug block as a whole, the plate surface of the right plate of the vertical plug block is located in the front-to-back vertical direction, the plate surface of the right plate of the vertical plug block is perpendicular to the plate surface of the bottom plate of the horizontal plug block, and the bottom end of the right plate of the vertical plug block is connected to the bottom end of the inclined plate of the vertical plug block as a whole;

[0007] The upper end of the middle connecting block is a right angle, the horizontal right angle side end face of the upper end of the middle connecting block is flush with the top surface of the top plate of the horizontal plug block, and the vertical right angle side end face of the upper end of the middle connecting block is flush with the left end side face of the left side plate of the vertical plug block;

[0008] The left side plate of the vertical plug block, the top plate of the vertical plug block, the right side plate of the vertical plug block and the inclined plate of the vertical plug block form a vertical cavity, a vertical top screw fixing plate is provided in the vertical cavity, the plate surface of the vertical top screw fixing plate is parallel to the plate surface of the left side plate of the vertical plug block, the upper end or the lower end of the vertical top screw fixing plate is fixedly connected to the inner wall of the vertical cavity through the upper inclined rib plate, a vertical top screw is screwed on the middle part of the vertical top screw fixing plate, the axis of the vertical top screw is located in the left and right horizontal directions, and the vertical top screw adopts a clearance fit to pass through the right side plate of the vertical plug block.

[0009] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein a horizontal fork plate is provided in the middle of the top plate of the horizontal plug block, the left end of the horizontal fork plate is connected to the middle of the top plate of the horizontal plug block as a whole, and the right end of the horizontal fork plate is a free end that can pop up downward; a vertical fork plate is provided in the middle of the left plate of the vertical plug block, the upper end of the vertical fork plate is connected to the middle of the left plate of the vertical plug block as a whole, and the lower end of the vertical fork plate is a free end that can pop up to the right.

[0010] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein an arc groove penetrating the right angle of the middle connecting block is provided at the right angle of the upper end of the middle connecting block along the front-back direction.

[0011] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein the radius of the arc-shaped groove is 0.15 mm.

[0012] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein the top plate of the horizontal plug block, the vertical plate of the horizontal plug block, the bottom plate of the horizontal plug block, the inclined plate of the horizontal plug block, the lower inclined rib plate and the horizontal top screw fixing plate are respectively made of engineering plastics, the left side plate of the vertical plug block, the top plate of the vertical plug block, the right side plate of the vertical plug block, the inclined plate of the vertical plug block, the upper inclined rib plate and the vertical top screw fixing plate are respectively made of engineering plastics, and the middle connecting block is made of engineering plastics.

[0013] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein the lower oblique rib plate is fixedly connected to the inner wall at the lower left corner of the horizontal cavity, and the upper oblique rib plate is fixedly connected to the inner wall at the upper right corner of the vertical cavity.

[0014] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein the upper end of the left side surface of the horizontal plug block vertical plate is connected with an upper left positioning plug block, the lower end of the left side surface of the horizontal plug block vertical plate is connected with a lower left positioning plug block, the left end of the top of the vertical plug block top plate is connected with an upper left positioning plug block, and the right end of the top of the vertical plug block top plate is connected with an upper right positioning plug block.

[0015] The utility model discloses an anti-loosening angle code for connecting frame corners, wherein the upper left positioning plug block, the lower left positioning plug block, the upper left positioning plug block and the upper right positioning plug block are made of engineering plastics.

[0016] When the anti-loosening angle code for frame corner connection of the utility model is used, it can be used to connect two profile frames with slots. The corresponding slots on the profile frame should allow the top plate of the horizontal plug-in block, the vertical plate of the horizontal plug-in block and the bottom plate of the horizontal plug-in block to be inserted with a clearance fit, that is, the corresponding upper, lower surfaces and side surfaces of the top plate of the horizontal plug-in block and the bottom plate of the horizontal plug-in block should simultaneously be tightly attached to the inner wall of the slot of the profile frame, and the same is true for the left side plate of the vertical plug-in block, the top plate of the vertical plug-in block and the right side plate of the vertical plug-in block. The corresponding slots on the profile frame should allow the left side plate of the vertical plug-in block, the top plate of the vertical plug-in block and the right side plate of the vertical plug-in block to be inserted with a clearance fit, that is, the corresponding upper, lower surfaces and side surfaces of the left side plate of the vertical plug-in block and the right side plate of the vertical plug-in block should simultaneously be tightly attached to the inner wall of the slot of the profile frame; After the plate, the vertical plate and the bottom plate of the horizontal plug block are inserted into the slots of the profile frame, and after the left plate, the top plate and the right plate of the vertical plug block are inserted into the slots of the profile frame, the horizontal top screw and the vertical top screw are rotated by tools respectively, so that the horizontal top screw is pushed against the inner wall of the horizontal cavity, and the vertical top screw is pushed against the inner wall of the vertical cavity, so that the top plate, the vertical plate and the bottom plate of the horizontal plug block are deformed to affect the tightness of the assembly, and the left plate and the right plate of the vertical plug block are deformed to affect the tightness of the assembly, and the horizontal top screw and the vertical top screw that pass through the connected profile also play a connecting and fixing role, thereby preventing the anti-loosening angle code for the frame corner connection from being separated from the corresponding slot of the profile frame. Therefore, the frame corner connection angle code of the utility model has the characteristics of making the connected frame corner very firm, not loose or deformed, and having high connection strength and high rigidity for the frame corner.

[0017] The anti-loosening angle bracket for connecting the corners of the frame of the present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of the structural schematic diagram of the anti-loosening angle bracket for frame corner connection of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the anti-loosening angle bracket for frame corner connection of the utility model in a use state;

[0020] Figure 3 The utility model is a structural schematic diagram of an implementation method of an anti-loosening angle code for frame corner connection. DETAILED DESCRIPTION

[0021] like Figure 1 and Figure 2As shown, the anti-loosening angle code for frame corner connection of the utility model comprises a transverse plug-in block top plate 1, the board surface of the transverse plug-in block top plate 1 is located in the horizontal direction, the left end of the transverse plug-in block top plate 1 is connected to the top end of the transverse plug-in block vertical plate 2 as a whole, the bottom end of the transverse plug-in block vertical plate 2 is connected to the left end of the transverse plug-in block bottom plate 3 as a whole, the board surface of the transverse plug-in block bottom plate 3 is located in the horizontal direction, the right end of the transverse plug-in block top plate 1 is connected to the top end of the transverse plug-in block inclined plate 4 as a whole, the bottom end of the transverse plug-in block inclined plate 4 is connected to the right end of the transverse plug-in block bottom plate 3 as a whole, and the board surface of the transverse plug-in block inclined plate 4 is inclined;

[0022] The top plate 1 of the horizontal plug block, the vertical plate 2 of the horizontal plug block, the bottom plate 3 of the horizontal plug block and the inclined plate 4 of the horizontal plug block form a horizontal cavity 5, a horizontal top screw fixing plate 9 is provided in the horizontal cavity 5, the plate surface of the horizontal top screw fixing plate 9 is located in the horizontal direction, the left end or the right end of the horizontal top screw fixing plate 9 is fixedly connected to the inner wall of the horizontal cavity 5 through the lower inclined rib plate 6, a horizontal top screw 10 is screwed on the middle part of the horizontal top screw fixing plate 9, the axis of the horizontal top screw 10 is located in the front and rear horizontal direction, and the horizontal top screw 10 is passed through the bottom plate 3 of the horizontal plug block by a clearance fit;

[0023] The plate surface of the horizontal plug-in block inclined plate 4 facing the upper right is attached to the surface of the middle connecting block 7 facing the lower left, the surface of the middle connecting block 7 facing the upper right is attached to the plate surface of the vertical plug-in block inclined plate 8 facing the lower left, the plate surface of the vertical plug-in block inclined plate 8 is inclined, the top end of the vertical plug-in block inclined plate 8 is connected to the bottom end of the vertical plug-in block left plate 11 as a whole, the plate surface of the vertical plug-in block left plate 11 is located in the front-to-back vertical direction, the plate surface of the vertical plug-in block left plate 11 is perpendicular to the plate surface of the horizontal plug-in block top plate 1, the top end of the vertical plug-in block left plate 11 is connected to the left end of the vertical plug-in block top plate 12 as a whole, the right end of the vertical plug-in block top plate 12 is connected to the top end of the vertical plug-in block right plate 13 as a whole, the plate surface of the vertical plug-in block right plate 13 is located in the front-to-back vertical direction, the plate surface of the vertical plug-in block right plate 13 is perpendicular to the plate surface of the horizontal plug-in block bottom plate 3, and the bottom end of the vertical plug-in block right plate 13 is connected to the bottom end of the vertical plug-in block inclined plate 8 as a whole;

[0024] The upper end of the middle connecting block 7 is a right angle, the horizontal right angle side end face of the upper end of the middle connecting block 7 is flush with the top surface of the horizontal plug block top plate 1, and the vertical right angle side end face of the upper end of the middle connecting block 7 is flush with the left end side face of the left side plate 11 of the vertical plug block;

[0025] The vertical plug block left side plate 11, the vertical plug block top plate 12, the vertical plug block right side plate 13 and the vertical plug block inclined plate 8 form a vertical cavity 15, and a vertical top screw fixing plate 16 is provided in the vertical cavity 15. The plate surface of the vertical top screw fixing plate 16 is parallel to the plate surface of the vertical plug block left side plate 11, and the upper end or the lower end of the vertical top screw fixing plate 16 is fixedly connected to the inner wall of the vertical cavity 15 through the upper inclined rib plate 17. A vertical top screw 14 is screwed on the middle part of the vertical top screw fixing plate 16, and the axis of the vertical top screw 14 is located in the left and right horizontal directions. The vertical top screw 14 adopts a clearance fit to pass through the vertical plug block right side plate 13.

[0026] As a further improvement of the utility model, a transverse fork plate 18 is provided in the middle of the transverse insert block top plate 1, the left end of the transverse fork plate 18 is connected to the middle of the transverse insert block top plate 1 as a whole, and the right end of the transverse fork plate 18 is a free end that can bounce downward; see Figure 2 When in use, the resilient end of the transverse fork plate 18 can be pressed against the corresponding slot on the profile, thereby playing a role of loosening. This design allows the frame corner connection anti-loosening angle bracket of the utility model to withstand a greater assembly pressing force without deformation or damage during assembly and use, thereby making the connected frame corners very firm, without loosening or deformation, and having high connection strength and high rigidity for the frame corners.

[0027] A vertical fork plate 19 is provided in the middle of the left side plate 11 of the vertical plug block, the upper end of the vertical fork plate 19 is connected to the middle of the left side plate 11 of the vertical plug block as a whole, and the lower end of the vertical fork plate 19 is a free end that can bounce to the right. Figure 2 When in use, the springable end of the vertical fork plate 19 can be pressed against the corresponding slot on the profile, thereby playing a role of loosening.

[0028] As a further improvement of the present invention, an arc groove 20 is provided at the right angle of the upper end of the middle connecting block 7 along the front-to-back direction, penetrating the right angle of the middle connecting block 7. This design allows the anti-loosening angle bracket for the frame corner connection of the present invention to withstand a greater assembly pressing force without deformation or damage during assembly and use, thereby making the connected frame corners very firm, without loosening or deformation, and having high connection strength and rigidity for the frame corners.

[0029] As a further improvement of the present invention, the radius of the arc groove 20 is 0.15 mm.

[0030] As a further improvement of the present utility model, the above-mentioned horizontal plug block top plate 1, horizontal plug block vertical plate 2, horizontal plug block bottom plate 3, horizontal plug block inclined plate 4, lower inclined rib plate 6 and horizontal top screw fixing plate 9 are respectively made of engineering plastics, the vertical plug block left side plate 11, vertical plug block top plate 12, vertical plug block right side plate 13, vertical plug block inclined plate 8, upper inclined rib plate 17 and vertical top screw fixing plate 16 are respectively made of engineering plastics, and the middle connecting block 7 is made of engineering plastics.

[0031] As a further improvement of the present invention, the lower oblique rib plate 6 is fixedly connected to the inner wall at the lower left corner of the transverse cavity 5 , and the upper oblique rib plate 17 is fixedly connected to the inner wall at the upper right corner of the vertical cavity 15 .

[0032] As a further improvement of the utility model, the upper end of the left side of the horizontal plug block vertical plate 2 is connected to the upper left positioning plug block 21, the lower end of the left side of the horizontal plug block vertical plate 2 is connected to the lower left positioning plug block 22, the left end of the top of the vertical plug block top plate 12 is connected to the upper left positioning plug block 23, and the right end of the top of the vertical plug block top plate 12 is connected to the upper right positioning plug block 24. This design allows the anti-loosening angle code for the frame corner connection of the utility model to withstand a greater assembly clamping force without deformation and damage during assembly and use, thereby making the connected frame corners very firm, without loosening or deformation, and having high connection strength and rigidity for the frame corners.

[0033] As a further improvement of the present utility model, the upper left positioning block 21, the lower left positioning block 22, the upper left positioning block 23 and the upper right positioning block 24 are made of engineering plastics.

[0034] When the frame corner connection anti-loosening angle code of the utility model is used, refer to Figure 2 and Figure 3, it can be used to connect two profile frames with slots, and the corresponding slots on the profile frame should allow the horizontal plug-in block top plate 1, the horizontal plug-in block vertical plate 2 and the horizontal plug-in block bottom plate 3 to be inserted with a clearance fit, that is, the corresponding upper, lower surfaces and side surfaces of the horizontal plug-in block top plate 1 and the horizontal plug-in block bottom plate 3 should simultaneously be close to the inner wall of the slot of the profile frame, and the same is true for the vertical plug-in block left side plate 11, the vertical plug-in block top plate 12 and the vertical plug-in block right side plate 13. The corresponding slots on the profile frame should allow the vertical plug-in block left side plate 11, the vertical plug-in block top plate 12 and the vertical plug-in block right side plate 13 to be inserted with a clearance fit, that is, the corresponding upper, lower surfaces and side surfaces of the vertical plug-in block left side plate 11 and the vertical plug-in block right side plate 13 should simultaneously be close to the inner wall of the slot of the profile frame; After inserting into the slot of the profile frame, and after the left side plate 11 of the vertical plug block, the top plate 12 of the vertical plug block, and the right side plate 13 of the vertical plug block are inserted into the slot of the profile frame, the horizontal top screw 10 and the vertical top screw 14 are rotated respectively by using tools, so that the horizontal top screw 10 pushes against the inner wall of the horizontal cavity 5, and the vertical top screw 14 pushes against the inner wall of the vertical cavity 15, thereby causing the top plate 1 of the horizontal plug block, the vertical plate 2 of the horizontal plug block, and the bottom plate 3 of the horizontal plug block to produce a deformation that affects the tightness of the assembly, and causing the left side plate 11 of the vertical plug block and the right side plate 13 of the vertical plug block to produce a deformation that affects the tightness of the assembly, and at the same time, the horizontal top screw 10 and the vertical top screw 14 that pass through the connected profile also play a connecting and fixing role, thereby preventing the anti-loosening angle code for the frame corner connection from detaching from the corresponding slot of the profile frame. Therefore, the frame corner connection angle code of the utility model has the characteristics of making the connected frame corner very firm, not loose or deformed, and having high connection strength and high rigidity for the frame corner.

[0035] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineering and technical personnel in the field shall fall within the protection scope determined by the claims of the present invention.

Claims

1. Anti-loosening angle code for frame corner connection, characterized by: The utility model comprises a transverse insert block top plate (1), the plate surface of the transverse insert block top plate (1) is located in the horizontal direction, the left end of the transverse insert block top plate (1) is connected to the top end of the transverse insert block vertical plate (2) as a whole, the bottom end of the transverse insert block vertical plate (2) is connected to the left end of the transverse insert block bottom plate (3) as a whole, the plate surface of the transverse insert block bottom plate (3) is located in the horizontal direction, the right end of the transverse insert block top plate (1) is connected to the top end of the transverse insert block inclined plate (4) as a whole, the bottom end of the transverse insert block inclined plate (4) is connected to the right end of the transverse insert block bottom plate (3) as a whole, and the plate surface of the transverse insert block inclined plate (4) is inclinedly arranged; The transverse insert block top plate (1), the transverse insert block vertical plate (2), the transverse insert block bottom plate (3) and the transverse insert block inclined plate (4) surround a transverse cavity (5), a transverse top screw fixing plate (9) is provided in the transverse cavity (5), the plate surface of the transverse top screw fixing plate (9) is located in the horizontal direction, the left end or the right end of the transverse top screw fixing plate (9) is fixedly connected to the inner wall of the transverse cavity (5) through the lower inclined rib plate (6), a transverse top screw (10) is screwed on the middle part of the transverse top screw fixing plate (9), the axis of the transverse top screw (10) is located in the front-rear horizontal direction, and the transverse top screw (10) passes through the transverse insert block bottom plate (3) by clearance fit; The plate surface of the horizontal plug-in block inclined plate (4) facing the upper right is in contact with the surface of the middle connecting block (7) facing the lower left, the surface of the middle connecting block (7) facing the upper right is in contact with the plate surface of the vertical plug-in block inclined plate (8) facing the lower left, the plate surface of the vertical plug-in block inclined plate (8) is inclined, the top end of the vertical plug-in block inclined plate (8) is connected to the bottom end of the vertical plug-in block left plate (11) as a whole, the plate surface of the vertical plug-in block left plate (11) is located in the front and rear vertical direction, and the plate surface of the vertical plug-in block left plate (11) is in contact with the horizontal plug-in block. The board surface of the plug block top plate (1) is vertical, the top end of the vertical plug block left plate (11) is connected to the left end of the vertical plug block top plate (12) as a whole, the right end of the vertical plug block top plate (12) is connected to the top end of the vertical plug block right plate (13) as a whole, the board surface of the vertical plug block right plate (13) is located in the front and rear vertical direction, the board surface of the vertical plug block right plate (13) is perpendicular to the board surface of the horizontal plug block bottom plate (3), and the bottom end of the vertical plug block right plate (13) is connected to the bottom end of the vertical plug block inclined plate (8) as a whole; The upper end of the middle connecting block (7) is in a right angle shape, the horizontal right angle side end face of the upper end of the middle connecting block (7) is flush with the top surface of the horizontal inserting block top plate (1), and the vertical right angle side end face of the upper end of the middle connecting block (7) is flush with the left end side face of the left side plate (11) of the vertical inserting block; The vertical plug block left side plate (11), the vertical plug block top plate (12), the vertical plug block right side plate (13) and the vertical plug block inclined plate (8) surround a vertical cavity (15), a vertical top screw fixing plate (16) is provided in the vertical cavity (15), the plate surface of the vertical top screw fixing plate (16) is parallel to the plate surface of the vertical plug block left side plate (11), the upper end or the lower end of the vertical top screw fixing plate (16) is fixedly connected to the inner wall of the vertical cavity (15) through the upper inclined rib plate (17), the middle part of the vertical top screw fixing plate (16) is screwed with a vertical top screw (14), the axis of the vertical top screw (14) is located in the left and right horizontal directions, and the vertical top screw (14) passes through the vertical plug block right side plate (13) by clearance fit.

2. The anti-loosening angle bracket for frame corner connection according to claim 1, characterized in that: A horizontal fork plate (18) is provided in the middle of the top plate (1) of the horizontal plug block, the left end of the horizontal fork plate (18) is connected to the middle of the top plate (1) of the horizontal plug block as a whole, and the right end of the horizontal fork plate (18) is a free end that can be bounced downward; a vertical fork plate (19) is provided in the middle of the left plate (11) of the vertical plug block, the upper end of the vertical fork plate (19) is connected to the middle of the left plate (11) of the vertical plug block as a whole, and the lower end of the vertical fork plate (19) is a free end that can be bounced rightward.

3. The anti-loosening angle bracket for frame corner connection according to claim 2, characterized in that: An arc-shaped groove (20) penetrating the right angle of the middle connecting block (7) is provided at the right angle of the upper end of the middle connecting block (7) along the front-back direction.

4. The anti-loosening angle bracket for frame corner connection according to claim 3 is characterized in that: The radius of the arc-shaped groove (20) is 0.15 mm.

5. The anti-loosening angle bracket for frame corner connection according to claim 4, characterized in that: The top plate (1) of the horizontal plug block, the vertical plate (2) of the horizontal plug block, the bottom plate (3) of the horizontal plug block, the inclined plate (4) of the horizontal plug block, the lower inclined rib plate (6) and the horizontal top screw fixing plate (9) are respectively made of engineering plastics; the left side plate (11) of the vertical plug block, the top plate (12) of the vertical plug block, the right side plate (13) of the vertical plug block, the inclined plate (8), the upper inclined rib plate (17) and the vertical top screw fixing plate (16) are respectively made of engineering plastics; and the middle connecting block (7) is made of engineering plastics.

6. The anti-loosening angle bracket for frame corner connection according to claim 5, characterized in that: The lower oblique rib plate (6) is fixedly connected to the inner wall at the lower left corner of the transverse cavity (5), and the upper oblique rib plate (17) is fixedly connected to the inner wall at the upper right corner of the vertical cavity (15).

7. The anti-loosening angle bracket for frame corner connection according to any one of claims 1 to 6, characterized in that: The upper end of the left side surface of the horizontal plug block vertical plate (2) is connected to an upper left positioning plug block (21), the lower end of the left side surface of the horizontal plug block vertical plate (2) is connected to a lower left positioning plug block (22), the left end of the top of the vertical plug block top plate (12) is connected to an upper left positioning plug block (23), and the right end of the top of the vertical plug block top plate (12) is connected to an upper right positioning plug block (24).

8. The anti-loosening angle bracket for frame corner connection according to claim 7, characterized in that: The upper left positioning plug block (21), the lower left positioning plug block (22), the upper left positioning plug block (23) and the upper right positioning plug block (24) are made of engineering plastics.

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