Combined gate arm structure

CN224705033UActive Publication Date: 2026-09-01ENTROPY TECH (GUANGDONG) CO LTD
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Patent Information

Application Number
CN202521794256.4
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-08-21
Publication Date
2026-09-01
Estimated Expiration
2035-08-21

AI Technical Summary

Technical Problem

[0004]本申请实施例提供一种组合式闸杆结构,可以缓解现有焊接式闸杆结构存在单个闸杆损坏不便于维修更换的技术问题

Benefits of technology

[0019]本申请实施例提供的技术方案带来的有益效果至少包括:

✦ Generated by Eureka AI based on patent content.

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Abstract

This application discloses a combined gate arm structure, which includes a column tube, an assembly, and a fixing member. The column tube has a slot on its side wall. The assembly includes a gate arm and a connector assembly. The connector assembly includes a connector seat and a connector cover. The connector seat is fixedly connected to the gate arm through the connector cover. One end of the assembly with the connector assembly is inserted into the slot. The fixing member is used to connect the column tube and the assembly. The connector seat has at least one boss with a first connecting hole formed on the boss. The column tube has a second connecting hole formed on it. The first connecting hole and the second connecting hole are aligned. The fixing member passes through the first connecting hole and the second connecting hole to detachably connect the assembly and the column tube.
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Description

Technical Field

[0001] This application relates to the field of rotary gate technology, specifically to a combined gate arm structure. Background Technology

[0002] In the existing gate arm structure, the gate arm and the three-dimensional tube are connected by welding. Welding has the disadvantages of being time-consuming, labor-intensive, having high quality defects, and being difficult to repair and replace. When individual gate arms are damaged and need to be replaced, it is inconvenient to repair and replace them.

[0003] Therefore, the existing welded gate arm structure has the technical problem of being inconvenient to repair and replace when a single gate arm is damaged. Utility Model Content

[0004] This application provides a combined gate arm structure, which can alleviate the technical problem of existing welded gate arm structures where it is inconvenient to repair or replace a single damaged gate arm.

[0005] In a first aspect, embodiments of this application provide a combined gate arm structure, including:

[0006] The column tube has a groove on its side wall;

[0007] The assembly includes a gate arm and a connector assembly. The connector assembly includes a connector seat and a connector cover. The connector seat is fixedly connected to the gate arm through the connector cover. One end of the connector assembly is inserted into the slot in the assembly.

[0008] The connector seat is provided with at least one boss, a first connecting hole is formed on the boss, and a second connecting hole is formed on the column tube, with the first connecting hole and the second connecting hole being aligned.

[0009] A fastener is provided, which passes through the first connecting hole and the second connecting hole to detachably connect the assembly and the column tube. When the fastener is removed, the assembly is rotated to a preset position for removal.

[0010] Optionally, the connector cover is provided with a limiting structure, and the connector seat is provided with a mating structure. The limiting structure and the mating structure cooperate to restrict the connector cover from rotating relative to the connector seat.

[0011] Optionally, the limiting structure includes a first protrusion, and the mating structure includes a first recess, wherein the first protrusion is inserted into the first recess and engages with each other along the circumferential direction.

[0012] Optionally, a cavity is formed at one end of the gate arm facing the connector assembly, and the end of the connector assembly with a connector cover is inserted into the cavity, wherein the side wall of the connector seat abuts against the side wall of the gate arm and is in an interference fit.

[0013] Optionally, the connector assembly further includes a tension screw, the connector seat has a third connecting hole, the connector cover has a fourth connecting hole, the third connecting hole and the fourth connecting hole are aligned, and the tension screw is inserted into the third connecting hole and the fourth connecting hole to connect the connector seat and the connector cover.

[0014] Optionally, the connector seat is cylindrical, the outer peripheral wall of the connector cover is conical, and the end of the connector cover with a smaller diameter faces the connector seat, and the outer peripheral wall of the connector cover abuts against the inner sidewall of the connector seat.

[0015] Optionally, the connector seat sidewall is provided with at least four first recessed holes, and the at least four first recessed holes are distributed at equal angular intervals along the circumference of the connector seat.

[0016] Optionally, a second recess is provided on the side wall of the gate arm, and a second protrusion is provided on the side wall of the connector seat. The second protrusion is inserted into the second recess to restrict the circumferential movement of the gate arm relative to the connector seat.

[0017] Optionally, the connector decorative cover is fitted onto the outer periphery of the assembly to at least cover the connector assembly.

[0018] Optionally, the edge of the slot is provided with a clearance notch, and the clearance notch is arranged in a one-to-one correspondence with the boss. The assembly is fitted with the slot with a clearance, and can rotate relative to the column tube until the boss aligns with the clearance notch.

[0019] The beneficial effects of the technical solutions provided in this application include at least the following:

[0020] The connector assembly and the gate arm are first assembled into a unit, and then the unit is detachably connected to the column tube through the connector assembly. At the same time, the fasteners are inserted into the connection holes on the unit and the column tube to enhance the connection strength. When the gate arm needs to be disassembled for maintenance, the gate arm can be separated from the three-dimensional tube simply by removing the fasteners. This alleviates the technical problem of the existing welded gate arm structure, which makes it inconvenient to repair and replace a single damaged gate arm. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of the combined gate arm structure provided in this application;

[0023] Figure 2 This is a schematic diagram of the first type of structure of the column tube and the assembly in the combined gate arm structure provided in this application;

[0024] Figure 3 This is an exploded view of the column tube and the assembly in the combined gate arm structure provided in this application;

[0025] Figure 4 This is a schematic diagram of the second structure of the column tube and the assembly in the combined gate arm structure provided in this application;

[0026] Figure 5 This is a schematic diagram of the third type of structure of the column tube and the assembly in the combined gate arm structure provided in this application;

[0027] Figure 6 This application Figure 5 A schematic diagram of the combined gate arm structure provided in the diagram at section AA;

[0028] Figure 7 This is a schematic diagram of the first type of assembly in the combined gate arm structure provided in this application;

[0029] Figure 8 This is a structural schematic diagram of the joint assembly in the combined gate arm structure provided in this application;

[0030] Figure 9 This is a schematic diagram of the second type of assembly in the combined gate arm structure provided in this application.

[0031] Icon labels:

[0032] 1. Modular gate arm structure; 2. Post tube; 3. Groove; 4. Assembly; 5. Gate arm; 6. Connector assembly; 61. Connector seat; 62. Connector cover; 63. Tensioning screw; 7. Fixing component; 8. Boss; 9. First connecting hole; 10. Second connecting hole; 11. Limiting structure; 12. Mating structure; 13. Cavity; 14. Third connecting hole; 15. Fourth connecting hole; 16. Second protrusion; 17. Second recess; 18. Connector decorative cover; 19. Clearance notch; 20. Insertion part. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0034] Please see Figure 1 , Figure 2 , Figure 3 The combined gate arm structure 1 provided in this application includes a column tube 2, an assembly 4, and a fixing member 7. The column tube 2 has a groove 3 on its side wall. The assembly 4 includes a gate arm 5 and a connector assembly 6. The connector assembly 6 includes a connector seat 61 and a connector cover 62. The connector seat 61 is fixedly connected to the gate arm 5 through the connector cover 62. One end of the assembly 4 with the connector assembly 6 is inserted into the groove 3. The fixing member 7 is used to connect the column tube 2 and the assembly 4. The connector seat 61 has at least one boss 8, and a first connecting hole 9 is formed on the boss 8. A second connecting hole 10 is formed on the column tube 2. The first connecting hole 9 and the second connecting hole 10 are aligned. The fixing member 7 is provided through the first connecting hole 9 and the second connecting hole 10 to detachably connect the assembly 4 and the column tube 2.

[0035] When the fastener 7 is removed, the assembly 4 is rotated to a preset position for removal.

[0036] When the assembly 4 is inserted into the slot 3, the assembly 4 needs to be rotated by a preset angle so that the first connecting hole 9 on the connector seat 61 is aligned with the second connecting hole 10 on the column tube 2.

[0037] The fastener 7 can be a screw, and the fastener 7 is threadedly connected to the first connecting hole 9 and the second connecting hole 10.

[0038] Among them, the column tube 2 can be a column round tube, the groove 3 is opened on the circumferential side of the column round tube, and the opening direction of the groove 3 is the radial direction of the column round tube.

[0039] In this embodiment, the connector assembly 6 and the gate arm 5 are first assembled into a combination body 4, and then the combination body 4 is detachably connected to the column tube 2 through the connector assembly 6. At the same time, the fixing parts 7 are inserted into the connection holes on the combination body 4 and the column tube 2 respectively to enhance the connection strength. When it is necessary to disassemble and repair the gate arm 5, it is only necessary to remove the fixing parts 7 to separate the gate arm 5 from the three-dimensional tube, which alleviates the technical problem of the existing welded gate arm structure 1 where it is inconvenient to repair and replace a single damaged gate arm 5.

[0040] In one embodiment, please refer to Figure 3 , Figure 4 , Figure 5 The number of gate arms 5 can be any one, three, or four.

[0041] In one embodiment, please refer to Figure 6 , Figure 7 , Figure 8 The connector cover 62 is provided with a limiting structure 11, and the connector seat 61 is provided with a mating structure 12. The limiting structure 11 and the mating structure 12 are mated to restrict the connector cover 62 from rotating relative to the connector seat 61.

[0042] The limiting structure 11 of the connector cover 62 is located on the circumferential surface of the connector cover 62. When the connector cover 62 is partially inserted into the connector seat 61, the limiting structure 11 and the mating structure 12 of the connector seat 61 cooperate with each other, so that the connector cover 62 will not be displaced relative to the connector seat 61 in the circumferential direction.

[0043] It is understandable that the end of the connector cover 62 away from the gate arm 5 is inserted into the connector seat 61 and can move along the axial direction of the connector seat 61. The limiting structure 11 and the mating structure 12 cooperate with each other so that the connector cover 62 can only move along the axial direction and will not be relatively displaced along the circumferential and radial directions of the connector seat 61, thereby avoiding failure of the fixed connection between the connector assembly 6 and the gate arm 5 or the connection being weak.

[0044] In one embodiment, please refer to Figure 8 The limiting structure 11 includes a first protrusion, and the mating structure 12 includes a first recess, wherein the first protrusion is inserted into the first recess and engages with each other in the circumferential direction.

[0045] For example, the limiting structure 11 can be a first protrusion extending from the side wall of the connector cover 62, and the mating structure 12 can be a first recess formed by drilling a hole in the side wall of the connector seat 61, with the opening direction of the first recess facing the first protrusion so that the first protrusion can be inserted into the first recess.

[0046] The first protrusion can be fully inserted into the first concave hole.

[0047] It is understandable that when the first protrusion is inserted into the first recess, the first protrusion is relatively stationary relative to the first recess in the circumferential and radial directions of the connector seat 61, and there is no relative displacement between them in the circumferential and radial directions; while in the axial direction, the first protrusion will move axially along the inner wall of the first recess; wherein, the depth of the first recess in the axial direction is greater than the thickness of the first protrusion in the axial direction.

[0048] In one embodiment, please refer to Figure 7 A cavity 13 is formed at one end of the gate arm 5 facing the connector assembly 6. The end of the connector assembly 6 with the connector cover 62 is inserted into the cavity 13. The side wall of the connector seat 61 abuts against the side wall of the gate arm 5 and is in an interference fit.

[0049] For example, the gate arm 5 is hollow and can be a cylindrical structure. The side wall of the connector seat 61 is arc-shaped, and the outer wall of the side wall of the connector seat 61 abuts against the inner wall of the gate arm 5 to achieve a fixed connection between the gate arm 5 and the connector assembly 6.

[0050] It is understandable that the end of the connector assembly 6 away from the column tube 2 is inserted into the cavity 13 of the gate arm 5, and expands radially upward through the side wall of the connector seat 61, so that the side wall of the connector seat 61 and the inner wall of the gate arm 5 are interlocked, and the two are in an interference fit, thereby improving the stability of the fixed connection between the connector assembly 6 and the gate arm 5.

[0051] In one embodiment, please refer to Figure 7 and Figure 8 The connector assembly 6 also includes a tension screw 63, a connector seat 61 having a third connection hole 14, and a connector cover 62 having a fourth connection hole 15. The third connection hole 14 and the fourth connection hole 15 are aligned and the tension screw 63 is inserted into the third connection hole 14 and the fourth connection hole 15 to connect the connector seat 61 and the connector cover 62.

[0052] When the tightening screw 63 is rotated, the connector cover 62 moves axially along the connector seat 61, so that the side wall of the connector seat 61 expands radially outward along the connector seat 61.

[0053] Among them, the tension screw 63 is threadedly connected to the third connecting hole 14 and the fourth connecting hole 15.

[0054] Understandably, when one end of the connector assembly 6 is inserted into the cavity 13 of the gate arm 5, by rotating the tightening screw 63 in the first direction, the tightening screw 63 drives the connector cover 62 to move axially along the connector seat 61. The side wall of the connector cover 62 opens the side wall of the connector seat 61, so that the side wall of the connector seat 61 abuts and engages with the inner wall of the gate arm 5, thereby fixing the connector assembly 6 inside the gate arm 5.

[0055] It is understandable that when the connector assembly 6 needs to be separated from the gate arm 5, the connector cover 62 is moved axially along the connector seat 61 by rotating the tightening screw 63 in the second direction, and the side wall of the connector seat 61 that was stretched open is restored to its original state. At this time, the connector assembly 6 and the gate arm 5 are separated from each other; wherein the first direction and the second direction are opposite.

[0056] In one embodiment, please refer to Figure 6 The connector seat 61 is cylindrical, the outer peripheral wall of the connector cover 62 is conical, and the smaller diameter end of the connector cover 62 faces the connector seat 61. The outer peripheral wall of the connector cover 62 abuts against the inner side wall of the connector seat 61.

[0057] Among them, the side of the connector cover 62 along the circumferential direction is a circumferential surface. In the direction of the connector cover 62 toward the connector seat 61, the outer diameter of the circumferential surface gradually decreases. When the tightening screw 63 drives the connector cover 62 to move axially toward the connector seat 61, the outer diameter of the circumferential surface of the connector cover 62 in contact with the side wall of the connector seat 61 gradually increases, and the outer diameter of the side wall of the connector seat 61 gradually increases.

[0058] When the tightening screw 63 drives the connector cover 62 to move axially away from the connector seat 61, the outer diameter of the circumferential surface of the connector cover 62 in contact with the side wall of the connector seat 61 gradually decreases, and the outer diameter of the side wall of the connector seat 61 gradually decreases, thereby separating the connector assembly 6 from the gate arm 5.

[0059] It is understandable that the outer diameter of the circumferential surface of the connector cover 62 gradually decreases in the direction of the connector seat 61. By moving the connector cover 62 axially in the direction of the connector seat 61, the outer diameter of the side wall of the connector cover 62 that abuts against the side wall of the connector seat 61 gradually increases, thereby increasing the outer diameter of the side wall of the connector seat 61. The increased outer diameter of the side wall of the connector seat 61 interlocks with the inner wall of the gate arm 5 and forms an interference fit, thereby fixing the connector assembly 6 and the gate arm 5 together to form the assembly 4.

[0060] It should be noted that the connector assembly 6 and the gate arm 5 are first combined using the connector cover 62 and the tightening screw 63 to form the assembly 4. Then, the assembly 4 is inserted into the slot 3 of the column tube 2 to achieve a detachable connection between the gate arm 5 and the column tube 2.

[0061] In one embodiment, please refer to Figure 8 The connector seat 61 has at least four first recesses on its side wall, which divide the side wall of the connector seat 61 into at least four segments. The at least four first recesses are distributed at equal angular intervals along the circumference of the connector seat 61.

[0062] The connector cover 62 and the side wall of the connector seat 61 are in an interference fit.

[0063] For example, the first recessed hole divides the sidewall of the connector seat 61 into four lobes, which can be of the same shape and size.

[0064] For example, the first recessed hole divides the sidewall of the connector seat 61 into eight segments. Compared with four segments, each segment has a smaller circumferential width, which makes each segment less structurally strong and easier to be opened by the sidewall of the connector cover 62.

[0065] Understandably, the first concave hole and the first protrusion cooperate to restrict the circumferential movement of the connector cover 62 relative to the connector seat 61. On the other hand, the first concave hole divides the side wall of the connector seat 61 into at least four segments, which reduces the strength of each segment of the side wall of the connector seat 61 and makes it easier for the connector cover 62 to open it. This facilitates the tightening screw 63 to drive the connector cover 62 to move axially, thus preventing the threaded connection between the tightening screw 63 and the third connecting hole 14 and the fourth connecting hole 15 from failing due to excessive structural strength of the side wall of the connector seat 61.

[0066] In one embodiment, please refer to Figure 9 The gate arm 5 has a second recessed hole 17 on its side wall, and the connector seat 61 has a second protrusion 16 on its side wall. The second protrusion 16 is inserted into the second recessed hole 17 to restrict the movement of the gate arm 5 relative to the connector seat 61 in the circumferential direction.

[0067] For example, a second protrusion 16 extends from the side wall of the connector seat 61, and a second recess 17 is formed by drilling a hole in the side wall of the gate arm 5. The opening direction of the second recess 17 faces the second protrusion 16 so that the second protrusion 16 can be inserted into the second recess 17.

[0068] The second protrusion 16 can be fully inserted into the second recess 17.

[0069] It is understandable that when the second protrusion 16 is inserted into the second recess 17, the second protrusion 16 is relatively stationary relative to the second recess 17 in the circumferential and radial directions of the connector seat 61, and there will be no relative displacement between the two in the circumferential and radial directions, so that there will be no relative displacement between the gate arm 5 and the connector seat 61 in the circumferential direction.

[0070] In one embodiment, please refer to Figures 1 to 5 The combined gate arm structure 1 also includes a joint decorative cover 18, which is fitted on the outer periphery of the assembly 4 to at least cover the joint assembly 6.

[0071] For example, the connector decorative cover 18 has an insertion part 20. After the assembly 4 is inserted into the slot 3, it forms at least one gap position. The insertion part 20 is inserted into the gap position of the slot 3 and is clamped to the column tube 2 to fix the connector decorative cover 18.

[0072] It is understandable that the connector decorative cover 18 is provided with a connector for connecting the connector decorative cover 18 to the column pipe 2 and the connector assembly 6. The connector decorative cover 18 is used to hide and cover the connector assembly 6 to improve the aesthetics of the combined gate arm structure 1.

[0073] In one embodiment, please refer to Figure 3 The edge of the slot 3 is provided with a clearance notch 19, and the clearance notch 19 is arranged in a one-to-one correspondence with the boss 8. The assembly 4 is in clearance fit with the slot 3 and can rotate relative to the column tube 2 until the boss 8 is aligned with the clearance notch 19.

[0074] It is understood that the assembly 4 can be rotated relative to the column tube 2 until the boss 8 aligns with the clearance notch 19, so as to disassemble and remove the assembly 4 and realize the detachable connection between the assembly and the column tube.

[0075] In one embodiment, please refer to Figure 3 At least two second connecting holes 10 are formed on the column tube 2. The two second connecting holes 10 are symmetrically arranged on both sides of the slot 3. At least two bosses 8 are provided on the connector seat 61. A first connecting hole 9 is formed on one boss 8. The first connecting hole 9 and the second connecting hole 10 are aligned.

[0076] It is understandable that at least two second connection holes 10 are formed on the column tube 2, and the two second connection holes 10 are symmetrically arranged on both sides of the slot 3, so that the connection between the column tube 2 and the assembly 4 is more stable.

[0077] This application provides a combined gate arm structure 1, which achieves a detachable connection between the gate arm 5 and the column tube 2 through a connector assembly 6. One end of the connector assembly 6 is inserted into the slot 3 of the column tube 2 and is detachably connected, while the other end of the connector assembly 6 is inserted into the cavity 13 of the gate arm 5 and is fixedly connected. The connector assembly 6 requires less mold opening and occupies less space when placed inside the column tube 2. The assembly of the connector assembly 6 and the column tube 2 is simple. At the same time, the combined gate arm structure 1 of this application is easy to repair and replace when a single gate arm 5 is damaged.

[0078] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0079] The combined gate arm structure provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A combined gate arm structure, characterized in that, include: The column pipe (2) has a groove (3) on its side wall; The assembly (4) includes a gate arm (5) and a connector assembly (6). The connector assembly (6) includes a connector seat (61) and a connector cover (62). The connector seat (61) is fixedly connected to the gate arm (5) through the connector cover (62). One end of the connector assembly (6) is inserted into the slot (3) of the assembly (4). The connector seat (61) is provided with at least one boss (8), the boss (8) is provided with a first connecting hole (9), and the column tube (2) is provided with a second connecting hole (10). The first connecting hole (9) and the second connecting hole (10) are aligned. A fastener (7) is provided through the first connecting hole (9) and the second connecting hole (10) to detachably connect the assembly (4) and the column tube (2).

2. The combined gate arm structure as described in claim 1, characterized in that, The connector cover (62) is provided with a limiting structure (11), and the connector seat (61) is provided with a mating structure (12). The limiting structure (11) and the mating structure (12) cooperate to restrict the connector cover (62) from rotating relative to the connector seat (61).

3. The combined gate arm structure as described in claim 2, characterized in that, The limiting structure (11) includes a first protrusion, and the mating structure (12) includes a first recess, wherein the first protrusion is inserted into the first recess and engages with each other in the circumferential direction.

4. The combined gate arm structure as described in claim 3, characterized in that, The gate arm (5) has a cavity (13) at one end facing the connector assembly (6). The end of the connector assembly (6) with a connector cover (62) is inserted into the cavity (13). The side wall of the connector seat (61) abuts against the side wall of the gate arm (5) and is in an interference fit.

5. The combined gate arm structure as described in claim 4, characterized in that, The connector assembly (6) further includes a tension screw (63), the connector seat (61) has a third connection hole (14), the connector cover (62) has a fourth connection hole (15), the third connection hole (14) and the fourth connection hole (15) are aligned, and the tension screw (63) is inserted into the third connection hole (14) and the fourth connection hole (15) to connect the connector seat (61) and the connector cover (62).

6. The combined gate arm structure as described in claim 5, characterized in that, The connector seat (61) is cylindrical, the outer peripheral wall of the connector cover (62) is conical, and the smaller diameter end of the connector cover (62) faces the connector seat (61), and the outer peripheral wall of the connector cover (62) abuts against the inner side wall of the connector seat (61).

7. The combined gate arm structure as described in claim 6, characterized in that, The connector seat (61) has at least four first recessed holes on its side wall, and the at least four first recessed holes are distributed at equal angular intervals along the circumference of the connector seat (61).

8. The combined gate arm structure as described in claim 1, characterized in that, The gate arm (5) has a second recessed hole (17) on its side wall, and the connector seat (61) has a second protrusion (16) on its side wall. The second protrusion (16) is inserted into the second recessed hole (17) to restrict the movement of the gate arm (5) relative to the connector seat (61) in the circumferential direction.

9. The combined gate arm structure as described in claim 1, characterized in that, The combined gate arm structure also includes a connector decorative cover (18), which is sleeved on the outer periphery of the assembly (4) to at least cover the connector assembly (6).

10. The combined gate arm structure as described in claim 1, characterized in that, The groove (3) has a clearance notch (19) at its edge. The clearance notch (19) and the boss (8) are arranged in a one-to-one correspondence. The assembly (4) is fitted with the groove (3) with a clearance and can rotate relative to the column tube (2) until the boss (8) aligns with the clearance notch (19).