Aluminum alloy door and window connecting piece

Abstract

The invention discloses an aluminum alloy door and window connecting piece, and relates to the technical field of door and window connecting pieces, the aluminum alloy door and window connecting piece comprises two connecting frames, the two connecting frames are connected through a hinge assembly, the hinge assembly comprises a hinge frame and a hinge block, and the hinge frame and the hinge block are fixedly connected to the outer surfaces of the two connecting frames respectively; the hinge frame and the hinge block are hinged through a hinge shaft. Through cooperative arrangement of the connecting frames, the hinging assemblies, the connecting columns, the adjusting assemblies and the adjustable connecting assemblies, the included angle between the two connecting frames can be conveniently adjusted through the arranged hinging assemblies, and the lengths, extending out of the connecting frames, of the connecting columns can be conveniently adjusted through the adjusting assemblies; the length of the connecting structure is adjusted, the connecting width of the connecting piece can be conveniently adjusted through the arranged adjustable connecting assembly, the connecting piece is more flexible in use and can adapt to doors and windows of various specifications, and the performance and attractiveness of the doors and windows are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of door and window connectors, in particular to an aluminum alloy door and window connector. Background Art

[0002] Aluminum alloy is an alloy material with aluminum as the main component and other metal or non-metal elements added. It has many excellent properties, so it has been widely used in many fields. Aluminum alloy is often used in doors, windows, curtain walls, roofs and other structures of buildings. It has the advantages of beauty, corrosion resistance and high strength. Aluminum alloy doors and windows refer to doors and windows made of aluminum alloy extruded profiles as frames, stiles and sashes. Aluminum alloy doors and windows have been more and more widely used in the construction field due to their excellent performance and broad application prospects. With the continuous advancement of technology, aluminum alloy doors and windows will continue to develop and improve to provide people with better products and services. Aluminum alloy door and window connectors are an important part of aluminum alloy door and window structures. Their main function is to connect the various components of doors and windows to ensure the stability and sealing of doors and windows.

[0003] According to the patent application number 202011076206.4, an aluminum alloy door and window connector is disclosed, including a connector body, the surface of the connector body is provided with a first functional layer, the first functional layer includes a polyurea waterproof coating and a modified polyoxymethylene layer, the outer surface of the first functional layer is provided with a second functional layer, the second functional layer includes a gel coat resin layer and a ceramic-based composite coating, the inner cavity of the connector body is provided with a mounting hole, and the inner cavity of the mounting hole is provided with a threaded groove.

[0004] By adopting the above scheme, a polyurea waterproof coating is provided, so that excellent waterproof performance, corrosion resistance and wear resistance are achieved. By providing a modified polyformaldehyde layer, good high temperature resistance is achieved, and the damage of the connector body to high temperature is avoided. By providing a gel coat resin layer, water resistance, chemical resistance, corrosion resistance and wear resistance are achieved. By providing a ceramic-based composite coating, not only excellent wear resistance is achieved, but also the corrosion resistance of the connector body is further improved. However, the above scheme still has certain defects when used. The connectors in the above scheme are often not flexible enough in adjusting the length, angle and width, and it is difficult to accurately adapt to doors and windows of various specifications, which may lead to inaccurate installation of doors and windows, affecting the performance and appearance of doors and windows. To this end, we provide an aluminum alloy door and window connector to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to make up for the deficiencies of the prior art and provide an aluminum alloy door and window connector.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an aluminum alloy door and window connecting part, comprising two connecting frames, the two connecting frames are connected by a hinge assembly, the hinge assembly comprises a hinge frame and a hinge block, the hinge frame and the hinge block are respectively fixedly connected to the outer surfaces of the two connecting frames, the hinge frame and the hinge block are hinged by a hinge axis, the outer surface of the hinge frame is provided with two countersunk threaded holes, the inner walls of the two countersunk threaded holes are threadedly connected with hexagon socket limit bolts, the ends of the two hexagon socket limit bolts are installed with anti-slip silicone pads, and the anti-slip silicone pads are in contact with the hinge block, the inner walls of the two connecting frames are slidably connected with connecting columns, adjustment components are installed between the two connecting frames and the two connecting columns, and adjustable connecting components are installed at the ends of the two connecting columns away from the connecting frames.

[0007] Furthermore, the adjustment assembly includes a threaded rod rotatably connected to the inner wall of the connection frame, the threaded rod is threadedly connected to the connection column, and a bevel gear 1 is installed on the outer surface of the threaded rod.

[0008] Furthermore, the adjustment component also includes a fixed plate 1 installed on the inner wall of the connecting frame, the outer surface of the fixed plate 1 is rotatably connected to a rotating rod 1, the end of the rotating rod 1 is installed with a bevel gear 2, and the bevel gear 2 is meshed with the bevel gear 1, and a cross groove 1 is provided on the side of the rotating rod 1 away from the bevel gear 2.

[0009] Furthermore, the adjustment component also includes two sliding grooves opened on the inner wall of the connecting frame, and the inner walls of the two sliding grooves are both slidably connected with sliders, and the sliders are connected to the connecting columns.

[0010] Furthermore, the adjustable connection assembly includes a connection slide rail fixedly connected to the end of the connection column, and the inner wall of the connection slide rail is slidably connected to two connection moving blocks.

[0011] Furthermore, connecting plates are installed on the outer surfaces of the two connecting moving blocks, and two connecting holes are provided on the outer surfaces of the two connecting plates.

[0012] Furthermore, the inner wall of the connecting slide rail is provided with two guide grooves, the inner walls of the two guide grooves are slidably connected with two guide blocks, and the guide blocks are connected to the connecting moving block.

[0013] Furthermore, a forward and reverse screw rod is arranged inside the connecting slide rail, and the two connecting moving blocks are connected to the forward and reverse screw rods, and a bevel gear three is installed on the outer surface of the forward and reverse screw rods.

[0014] Furthermore, a fixing plate 2 is installed on the inner wall of the connecting slide rail, and a rotating rod 2 is rotatably connected to the inner wall of the fixing plate 2. A bevel gear 4 is installed on the end of the rotating rod 2, and the bevel gear 4 is meshed with the bevel gear 3. A cross groove 2 is provided on the side of the rotating rod 2 away from the bevel gear 4.

[0015] Compared with the prior art, the aluminum alloy door and window connector has the following beneficial effects:

[0016] 1. The present invention uses the matching arrangement between the connection frame, the hinge assembly, the connection column, the adjustment assembly and the adjustable connection assembly. By using the provided hinge assembly, the angle between the two connection frames can be easily adjusted. By using the adjustment assembly, the length of the connection column extending out of the connection frame can be easily adjusted, thereby adjusting the length of the connection structure. By using the provided adjustable connection assembly, the connection width of the connection piece can be easily adjusted, so that the connection piece is more flexible in use and can adapt to doors and windows of various specifications, thereby ensuring the performance and appearance of the doors and windows.

[0017] 2. The present invention cooperates with the connection frame, the articulated frame, the articulated block, the articulated shaft, the countersunk threaded hole, the hexagonal limit bolt and the anti-skid silicone pad to loosen the two hexagonal limit bolts so that the anti-skid silicone pad is away from the articulated block, thereby releasing the limit between the articulated frame and the articulated block, and rotating the two connection frames to adjust the angle between the two connection frames. After the adjustment, the two hexagonal limit bolts are tightened to press the anti-skid silicone pad so that the anti-skid silicone pad contacts the articulated block, thereby increasing the friction between the articulated frame and the articulated block, facilitating the limit between the articulated frame and the articulated block, and completing the adjustment of the angle between the two connection frames.

[0018] 3. The present invention uses the matching arrangement among the connecting frame, the connecting column, the adjusting assembly, the threaded rod, the bevel gear 1, the fixing plate 1, the rotating rod 1, the bevel gear 2, the cross groove 1, the sliding groove and the sliding block. A tool such as a screwdriver is inserted into the cross groove 1 to rotate the rotating rod 1, so that the rotating rod 1 can drive the bevel gear 2 to rotate together. By utilizing the matching between the bevel gear 2 and the bevel gear 1, the rotation of the bevel gear 2 can drive the bevel gear 1 and the threaded rod to rotate. The rotation of the threaded rod can drive the connecting column to move, so that the end of the connecting column can be extended and retracted on the inner wall of the connecting frame, and the length of the connecting piece can be conveniently adjusted.

[0019] 4. The present invention connects the slide rail, the connecting moving block, the connecting plate, the connecting hole, the guide groove, the guide block, the forward and reverse screw rods, the bevel gear three, the fixed plate two, the rotating rod two, the bevel gear four and the cross groove two, and uses a screwdriver or other tool to be inserted into the interior of the cross groove two to rotate the rotating rod two, thereby driving the bevel gear four and the bevel gear three to rotate, thereby driving the forward and reverse screw rods to rotate. The rotation of the forward and reverse screw rods can make the two connecting moving blocks move away from or approach each other, so that the distance between the two connecting plates can be adjusted conveniently, the width between the two connecting plates can be adjusted conveniently, and the connection width of the connecting piece can be adjusted conveniently. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the front view of the present invention;

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the right view of the present invention;

[0022] Figure 3 It is a schematic diagram of the internal structure of the connection frame of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the adjustable connection assembly of the present invention;

[0024] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure in the middle.

[0025] In the figure: 1. connecting frame; 2. hinge assembly; 201. hinge frame; 202. hinge block; 203. hinge shaft; 204. countersunk threaded hole; 205. hexagon socket limit bolt; 206. non-slip silicone pad; 3. connecting column; 4. adjustment assembly; 401. threaded rod; 402. bevel gear one; 403. fixed plate one; 404. rotating rod one; 405. bevel gear two; 406. cross groove one; 407. slide groove; 408. slide block; 5. adjustable connecting assembly; 501. connecting slide rail; 502. connecting moving block; 503. connecting plate; 504. connecting hole; 505. guide groove; 506. guide block; 507. forward and reverse screw rod; 508. bevel gear three; 509. fixed plate two; 510. rotating rod two; 511. bevel gear four; 512. cross groove two. DETAILED DESCRIPTION

[0026] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Embodiment 1

[0029] like Figure 1 and Figure 2 As shown, an aluminum alloy door and window connector includes two connecting frames 1, which are connected by a hinge assembly 2. The hinge assembly 2 includes a hinge frame 201 and a hinge block 202. The hinge frame 201 and the hinge block 202 are respectively fixedly connected to the outer surfaces of the two connecting frames 1, and the hinge frame 201 and the hinge block 202 are hinged by a hinge shaft 203. The outer surface of the hinge frame 201 is provided with two symmetrical countersunk threaded holes 204, and the inner walls of the two countersunk threaded holes 204 are threadedly connected with hexagon socket limit bolts 205. The ends of the two hexagon socket limit bolts 205 are installed with anti-skid silicone pads 206, and the anti-skid silicone pads 206 are in contact with the hinge block 202. The inner walls of the two connecting frames 1 are slidably connected with connecting columns 3, and adjustment components 4 are installed between the two connecting frames 1 and the two connecting columns 3. The ends of the two connecting columns 3 away from the connecting frames 1 are installed with adjustable connecting components 5.

[0030] In this embodiment, two bearings are fixedly embedded in the inner wall of the articulated frame 201, and the two ends of the articulated shaft 203 are respectively connected to the inner rings of the two bearings, which can ensure the rotation accuracy of the articulated block 202 when it rotates inside the articulated frame 201. Through grooves that are compatible with the connecting columns 3 are opened at the ends of the two connecting frames 1, and the ends of the two connecting columns 3 away from the connecting frame 1 respectively penetrate the inner walls of the two through grooves and extend to the outside of the connecting frame 1, and the outer surfaces of the connecting columns 3 are slidably connected to the inner walls of the through grooves.

[0031] The working steps of this embodiment are as follows:

[0032] like Figure 1 and Figure 2As shown, when the angle between the two connection frames 1 needs to be adjusted according to needs, first loosen the two hexagonal limit bolts 205, and the hexagonal limit bolts 205 can drive the anti-skid silicone pad 206 to move, so that the anti-skid silicone pad 206 can be kept away from the hinge block 202, and the contact between the anti-skid silicone pad 206 and the hinge block 202 can be released, so that the limit between the hinge frame 201 and the hinge block 202 can be easily released, and the two connection frames 1 can be rotated to make the hinge block 202 rotate around the hinge axis 203 on the inner wall of the hinge frame 201, so that the angle between the two connection frames 1 can be easily adjusted. After completion, tighten the two hexagonal limit bolts 205 to compress the anti-slip silicone pad 206, so that the anti-slip silicone pad 206 can be in contact with the hinge block 202, which can increase the friction between the hinge frame 201 and the hinge block 202, thereby facilitating the limiting of the hinge frame 201 and the hinge block 202, and completing the adjustment of the angle between the two connecting frames 1. The set adjustment component 4 can be used to conveniently adjust the extension length of the connecting column 3, thereby conveniently adjusting the length of the connecting piece. The set adjustable connecting component 5 can be used to conveniently connect the aluminum alloy door and window parts, thereby facilitating the use of the connecting piece.

[0033] Embodiment 2

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the adjustment component 4 includes a threaded rod 401 rotatably connected to the inner wall of the connecting frame 1, the threaded rod 401 is threadedly connected to the connecting column 3, and a bevel gear 402 is installed on the outer surface of the threaded rod 401. The adjustment component 4 also includes a fixed plate 403 installed on the inner wall of the connecting frame 1, and the outer surface of the fixed plate 403 is rotatably connected to a rotating rod 404, and a bevel gear 405 is installed on the end of the rotating rod 404, and the bevel gear 405 is meshed with the bevel gear 402. A cross groove 406 is provided on the side of the rotating rod 404 away from the bevel gear 405. The adjustment component 4 also includes two symmetrical sliding grooves 407 opened on the inner wall of the connecting frame 1, and the inner walls of the two sliding grooves 407 are slidably connected with sliders 408, and the slider 408 is connected to the connecting column 3.

[0035] In this embodiment, a threaded hole compatible with the threaded rod 401 is opened inside the connecting column 3, so that the outer surface of the threaded rod 401 can be threadedly connected to the inner wall of the threaded hole; a through hole compatible with the rotating rod 404 is opened on the outer surface of the connecting frame 1, and the end of the rotating rod 404 is located inside the through hole. The cross groove 406 is provided, so that the rotating rod 404 can be conveniently rotated by tools such as a screwdriver; a bearing is installed on the outer surface of the fixed plate 403, so that the outer surface of the rotating rod 404 can be connected to the inner ring of the bearing, so that the rotation accuracy of the rotating rod 404 can be guaranteed; when the connecting column 3 slides on the inner wall of the connecting frame 1, the slider 408 can slide on the inner wall of the slide groove 407, so as to guide and limit the connecting column 3 and ensure the stability of the connecting column 3 when moving.

[0036] The working steps of this embodiment are as follows:

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, when the length of the connecting piece needs to be adjusted, first use a tool such as a screwdriver to insert it into the inside of the cross slot 406 to rotate the rotating rod 404, so that the rotating rod 404 can drive the bevel gear 2 405 to rotate together, and by utilizing the cooperation between the bevel gear 2 405 and the bevel gear 1 402, the rotation of the bevel gear 2 405 can drive the bevel gear 1 402 and the threaded rod 401 to rotate, and by utilizing the threaded cooperation between the threaded rod 401 and the connecting column 3, the rotation of the threaded rod 401 can drive the connecting column 3 to move, so that the end of the connecting column 3 can be retracted and retracted on the inner wall of the connecting frame 1, thereby facilitating the adjustment of the length of the connecting piece and facilitating the use of the connecting piece.

[0038] Embodiment 3

[0039] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, the adjustable connection assembly 5 includes a connection rail 501 fixedly connected to the end of the connection column 3, the inner wall of the connection rail 501 is slidably connected to two symmetrical connection moving blocks 502, the outer surfaces of the two connection moving blocks 502 are both installed with connection plates 503, the outer surfaces of the two connection plates 503 are both provided with two connection holes 504, the inner wall of the connection rail 501 is provided with two symmetrical guide grooves 505, the inner walls of the two guide grooves 505 are both slidably connected to two symmetrical guide blocks 506, and the guide blocks 506 are symmetrical to the connection moving blocks 502. Connection, a forward and reverse screw rod 507 is arranged inside the connecting slide rail 501, and the two connecting moving blocks 502 are connected to the forward and reverse screw rod 507. A bevel gear three 508 is installed on the outer surface of the forward and reverse screw rod 507. A fixed plate two 509 is installed on the inner wall of the connecting slide rail 501. The inner wall of the fixed plate two 509 is rotatably connected with a rotating rod two 510. A bevel gear four 511 is installed on the end of the rotating rod two 510, and the bevel gear four 511 is meshed with the bevel gear three 508. A cross groove two 512 is provided on the side of the rotating rod two 510 away from the bevel gear four 511.

[0040] In this embodiment, the shapes of the two connecting moving blocks 502 are completely in line with the shapes of the inner walls of the connecting slide rails 501, which can guide and limit the connecting moving blocks 502. When the connecting plate 503 is in contact with the outer surface of the door and window to be connected, screws are passed through the inside of the connecting holes 504 so that the screws are connected to the outer surface of the door and window to be connected, which can facilitate the connection of the connecting plate 503 and the door and window to be connected. Threaded holes that are compatible with the positive and negative screw rods 507 are provided inside the two connecting moving blocks 502. The outer surface of the positive and negative screw rods 507 are threadedly connected to the inner wall of the threaded hole, and a through hole compatible with the rotating rod 510 is opened on the outer surface of the connecting slide rail 501. The end of the rotating rod 510 is located inside the through hole. The cross groove 512 is provided, so that the rotating rod 510 can be rotated by tools such as a screwdriver. A bearing is installed on the outer surface of the fixed plate 509, which can connect the outer surface of the rotating rod 510 to the inner ring of the bearing, thereby ensuring the rotation accuracy of the rotating rod 510.

[0041] The working steps of this embodiment are as follows:

[0042] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, when connecting door and window connectors of different widths, first use a screwdriver or other tool to insert into the inside of the cross slot 2 512 to rotate the rotating rod 2 510, thereby driving the bevel gear 4 511 and the bevel gear 3 508 to rotate, thereby driving the forward and reverse screw rods 507 to rotate, and by setting the threaded cooperation between the forward and reverse screw rods 507 and the two connecting moving blocks 502, the rotation of the forward and reverse screw rods 507 can make the two connecting moving blocks 502 move away from or approach each other under the guidance of the guide grooves 505 and the guide blocks 506, so that the distance between the two connecting plates 503 can be easily adjusted, the width between the two connecting plates 503 can be easily adjusted, the connection width of the connector can be easily adjusted, and the use of the connector is convenient.

[0043] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, and a specific direction structure and operation, and therefore, cannot be understood as a limitation on the present invention. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0044] It should be noted that the standard parts used in the present invention can all be purchased from the market, special-shaped parts can be customized according to the instructions and drawings, and the specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the inventor will not elaborate here.

[0045] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", etc. 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. An aluminum alloy door and window connector, comprising two connecting frames (1), characterized in that: The two connection frames (1) are connected via an articulated assembly (2), wherein the articulated assembly (2) comprises an articulated frame (201) and an articulated block (202), wherein the articulated frame (201) and the articulated block (202) are respectively fixedly connected to the outer surfaces of the two connection frames (1), wherein the articulated frame (201) and the articulated block (202) are articulated via an articulated shaft (203), wherein the outer surface of the articulated frame (201) is provided with two countersunk threaded holes (204), wherein the two countersunk threaded holes (204) are The inner walls of the two connecting frames (1) are threadedly connected with hexagon socket limit bolts (205), the ends of the two hexagon socket limit bolts (205) are installed with anti-skid silicone pads (206), and the anti-skid silicone pads (206) are in contact with the hinge block (202), the inner walls of the two connecting frames (1) are slidably connected with connecting columns (3), and adjustment components (4) are installed between the two connecting frames (1) and the two connecting columns (3), and the ends of the two connecting columns (3) away from the connecting frames (1) are installed with adjustable connecting components (5).

2. The aluminum alloy door and window connector according to claim 1, characterized in that: The adjustment assembly (4) comprises a threaded rod (401) rotatably connected to the inner wall of the connection frame (1), the threaded rod (401) being threadedly connected to the connection column (3), and a bevel gear 1 (402) is mounted on the outer surface of the threaded rod (401).

3. The aluminum alloy door and window connector according to claim 2, characterized in that: The adjustment assembly (4) further comprises a fixing plate (403) mounted on the inner wall of the connection frame (1); the outer surface of the fixing plate (403) is rotatably connected to a rotating rod (404); a bevel gear (405) is mounted on the end of the rotating rod (404); the bevel gear (405) is meshed with the bevel gear (402); and a cross groove (406) is provided on a side of the rotating rod (404) away from the bevel gear (405).

4. The aluminum alloy door and window connector according to claim 2, characterized in that: The adjustment component (4) further comprises two slide grooves (407) formed on the inner wall of the connection frame (1), the inner walls of the two slide grooves (407) being slidably connected with sliders (408), and the sliders (408) are connected to the connection pillars (3).

5. The aluminum alloy door and window connector according to claim 1, characterized in that: The adjustable connection assembly (5) comprises a connection slide rail (501) fixedly connected to the end of the connection column (3), and the inner wall of the connection slide rail (501) is slidably connected to two connection moving blocks (502).

6. The aluminum alloy door and window connector according to claim 5, characterized in that: The outer surfaces of the two connecting moving blocks (502) are both installed with connecting plates (503), and the outer surfaces of the two connecting plates (503) are both provided with two connecting holes (504).

7. The aluminum alloy door and window connector according to claim 5, characterized in that: The inner wall of the connecting slide rail (501) is provided with two guide grooves (505), and the inner walls of the two guide grooves (505) are both slidably connected with two guide blocks (506), and the guide blocks (506) are connected to the connecting moving block (502).

8. The aluminum alloy door and window connector according to claim 5, characterized in that: A forward and reverse screw rod (507) is arranged inside the connecting slide rail (501), and the two connecting moving blocks (502) are connected to the forward and reverse screw rod (507), and a bevel gear three (508) is installed on the outer surface of the forward and reverse screw rod (507).

9. The aluminum alloy door and window connector according to claim 8, characterized in that: A second fixing plate (509) is installed on the inner wall of the connecting slide rail (501), and a second rotating rod (510) is rotatably connected to the inner wall of the second fixing plate (509). A fourth bevel gear (511) is installed on the end of the second rotating rod (510), and the fourth bevel gear (511) is meshed with the third bevel gear (508). A second cross groove (512) is provided on a side of the second rotating rod (510) away from the fourth bevel gear (511).

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