Cylindrical swing gate
The cylindrical swing gate structure, which is rotatably connected to the base by a rotating cylinder, has a built-in drive component and reset component. This solves the problems of large size of traditional swing gate mechanisms and inability to open automatically when power is off, and achieves the effects of automatic reset and compact structure.
Patent Information
- Application Number
- CN202422669923.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The traditional swing gate movement is large in size and occupies space in the gate box, resulting in a larger overall size of the gate and the gate cannot be opened automatically in the event of a power outage.
The cylindrical swing gate structure, which is rotatably connected to the base, is equipped with a drive component and a reset assembly, including a sleeve and a torsion spring, to realize the automatic reset of the swing arm and power transmission. The drive component and reset assembly are installed inside the rotating cylinder, reducing space occupation.
It enables automatic opening of the gate in the event of a power outage, ensuring smooth passage, reducing space occupation, improving structural compactness and stability, and reducing maintenance costs.
Smart Images
Figure CN223458732U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of gate machine, especially relates to a cylindrical swing gate. BACKGROUND
[0002] Swing gate realizes blocking and releasing through rotation swing, is mainly applied to the scene that people flow is more concentrated, to the higher scene of fire control such as subway, cinema, when power failure occurs, swing gate should be opened automatically under the condition of not using standby power source. The traditional swing gate core is motor drive mechanism and swing door column separation structure, the motor drive mechanism is installed in the gate machine box body, and uses tension spring to realize power-off door opening function, the volume of this core is larger, can occupy a large part of the space of gate machine box body, leads to the overall volume of gate machine is larger. SUMMARY
[0003] The utility model discloses a cylindrical swing gate, which aims to reduce the overall volume of the cylindrical swing gate.
[0004] To achieve the above object, the cylindrical swing gate provided by the utility model comprises:
[0005] A base;
[0006] A swing arm assembly, which comprises a rotating cylinder and a swing arm, the rotating cylinder is arranged above the base and rotationally connected with the base, an installation cavity is formed in the rotating cylinder, and the swing arm is connected to the side wall of the rotating cylinder;
[0007] A driving member, which is arranged in the installation cavity, the output end of the driving member is connected with the rotating cylinder, and the driving member can drive the rotating cylinder to rotate along the base; and
[0008] A reset assembly, which is arranged in the installation cavity, the reset assembly comprises a connecting member and an elastic reset member, the connecting member is installed on the base, and the elastic reset member is connected between the connecting member and the rotating cylinder, and the elastic reset member can be elastically deformed when the rotating cylinder rotates.
[0009] In an embodiment, the connecting member is a sleeve, and the elastic reset member is a torsion spring, and the torsion spring is arranged around the sleeve.
[0010] In an embodiment, the cylindrical swing gate further comprises a top plate, the top plate is connected with the rotating cylinder, a plurality of fixing holes are formed in the periphery of the top plate, and one end of the torsion spring, away from the base, is clamped in one fixing hole.
[0011] In an embodiment, the cylindrical swing gate further comprises a clutch and an output shaft, the clutch is mounted on the base, two ends of the clutch are connected with the output end of the driving member and the output shaft respectively, and the output shaft is connected with the rotating cylinder at an end opposite to the clutch.
[0012] In an embodiment, the base comprises a bottom, a first support plate, a second support plate, a first support column and a second support column, the first support column is mounted above the bottom in a vertical direction, the first support plate is mounted on an end of the first support column away from the bottom, the second support column is mounted above the first support plate in a vertical direction, and the second support plate is mounted on an end of the second support column away from the first support plate.
[0013] The clutch is mounted on the first support plate, and the connecting member is mounted on the second support plate.
[0014] In an embodiment, the bottom comprises a bottom plate, a shell, a third support column, a bearing seat and a bearing, the third support column is mounted on the bottom plate in a vertical direction, the bearing seat is connected to an end of the third support column away from the bottom plate, the bearing is sleeved on the bearing seat, the rotating cylinder is sleeved on the outer edge of the bearing, and the shell is mounted on the bottom plate and wrapped around the outer edge of the third support column.
[0015] In an embodiment, the cylindrical swing gate further comprises a limiting assembly, the limiting assembly comprises a first limiting member and a second limiting member, the first limiting member is connected to the output shaft, the second limiting member is connected to the second support plate, and the first limiting member can rotate with the output shaft and abut against the second limiting member to limit the rotation of the output shaft.
[0016] In an embodiment, the first limiting member is a limiting block, the limiting block is sleeved on the output shaft, the second limiting member is a fixed block, and the fixed block is connected with the second support plate by using fasteners.
[0017] In an embodiment, the cylindrical swing gate further comprises a sensing member, the sensing member is mounted on the shell and electrically connected with the driving member.
[0018] In an embodiment, the swing arm assembly further comprises a connecting head and a decorative cover, the connecting head is arranged on the side wall of the rotating cylinder, the swing arm is sleeved on the connecting head, and the decorative cover is arranged on the connecting part of the connecting head and the swing arm.
[0019] The utility model discloses a cylindrical swing gate, the rotation connection between rotary cylinder and base allows the swing arm to swing within a certain angle range, and the setting of driving part provides power source for swing arm, so that the swing of swing arm is more accurate and reliable. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, the following will briefly introduce the drawing needed to be used in the embodiment or prior art description, obviously, the drawing in the following description only is some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to the structure shown by these drawings.
[0021] Figure 1 The structure schematic diagram of an embodiment of the cylindrical swing gate provided by the utility model is shown in the figure.
[0022] Figure 2 The internal structure schematic diagram of the base is shown in the figure. Figure 1 The explosion schematic diagram of the cylindrical swing gate is shown in the figure.
[0023] Figure 3 The internal structure schematic diagram of the base is shown in the figure. Figure 1
[0024] Explanation of reference numerals:
[0025] 1000, cylindrical swing gate;1, base;11, base;111, bottom plate;112, shell;113, third support column;114, bearing seat;115, bearing;12, first support plate;13, second support plate;14, first support column;15, second support column;2, swing arm assembly;21, rotary cylinder;22, swing arm;23, connecting head;24, decorative cover;3, driving part;4, reset component;41, connecting piece;42, elastic reset piece;5, top plate;6, clutch;7, output shaft;8, limiting component;81, first limiting piece;82, second limiting piece;9, sensing piece.
[0026] The realization of the utility model, functional characteristics and advantages will be further explained by combining with the embodiment and referring to the drawings. DETAILED DESCRIPTION
[0027] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0028] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0029] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.
[0030] The swing gate realizes blocking and release through rotation swing, and is mainly applied to scenes with relatively concentrated flow and high fire-fighting requirements such as subways and cinemas. When power failure occurs, the swing gate should automatically open the gate without using the standby power supply. The traditional swing gate core is a motor driving mechanism and a swing door column separation structure, the motor driving mechanism is installed in the gate machine box, and a tension spring is used to realize the power-off opening function. The volume of such core is large, which will occupy a large part of the space of the gate machine box, resulting in a large overall volume of the gate machine.
[0031] To solve the above problems, please refer to Figures 1 to 3The utility model provides a kind of cylindrical swing gate 1000, including pedestal 1, swing arm assembly 2, driving part 3 and reset component 4;Swing arm assembly 2 includes rotary cylinder 21 and swing arm 22, rotary cylinder 21 is located above pedestal 1, and is rotatably connected with pedestal 1, installation cavity is formed in rotary cylinder 21, swing arm 22 is connected in the side wall of rotary cylinder 21;Driving part 3 is located in installation cavity, and the output end of driving part 3 is connected rotary cylinder 21, and rotary cylinder 21 can be driven to rotate along pedestal 1;Reset component 4 is located in installation cavity, and reset component 4 includes connecting piece 41 and elastic reset piece 42, connecting piece 41 is installed on pedestal 1, and elastic reset piece 42 is connected connecting piece 41 with rotary cylinder 21, and elastic reset piece 42 can be elastically deformed when rotary cylinder 21 rotates.
[0032] The technical scheme of the utility model provides a kind of cylindrical swing gate 1000, the rotatable connection between rotary cylinder 21 and pedestal 1 allows swing arm 22 to swing within a certain angle range, and the setting of driving part 3 provides power source for swing arm 22, so that the swing of swing arm 22 is more accurate and reliable. By setting reset component 4 in installation cavity, swing arm assembly 2 is reset by elastic reset piece 42 when cylindrical swing gate 1000 is powered off, automatic opening gate is realized, smooth passage is ensured, in addition, driving part 3 and reset component 4 are installed inside rotary cylinder 21, not only protect driving part 3 from the influence of external environment, but also help to reduce space occupation, so that the structure of entire cylindrical swing gate 1000 is more compact, which is beneficial to reduce the overall volume of cylindrical swing gate 1000.
[0033] In an optional embodiment, for the convenience of realizing the reset of swing arm assembly 2, connecting piece 41 is a sleeve, and elastic reset piece 42 is a torsion spring, and the torsion spring is wound around the sleeve. By adopting the combination of sleeve and torsion spring, reset component 4 of cylindrical swing gate 1000 can provide stable and controllable reset force, ensuring that swing arm assembly 2 can accurately return to the initial position after the action is completed. Effective energy storage and release are realized in a smaller space, so that the cylindrical swing gate 1000 is compact in structure and flexible in operation. In addition, the durability and low maintenance characteristics of the torsion spring also help to reduce long-term operating costs. By winding the torsion spring around the sleeve, the torsion spring can be protected from the influence of external environment, reducing wear and corrosion and prolonging the service life of the equipment. At the same time, the use of the sleeve provides a stable mounting platform for the torsion spring, ensuring the stability and reliability of the reset force. By combining the elastic properties of the torsion spring and the stability of the sleeve, a compact, reliable and efficient reset system is realized, which helps to improve the stability and response speed of the entire cylindrical swing gate 1000. In other embodiments, elastic reset piece 42 can also be a flexible elastic band structure, and by winding the elastic band around the sleeve, the elastic reset of swing arm assembly 2 can also be realized.
[0034] Further, for the convenience of adjusting the size of reset force of reset component 4, please refer toFigures 1 to 3 The cylindrical swing gate 1000 further comprises a top plate 5 connected with the rotating cylinder 21, and a plurality of fixing holes are arranged on the periphery of the top plate 5, and one end of the torsion spring away from the base 1 is clamped in one fixing hole. By adjusting the connection position of the torsion spring on the top plate 5, the size of the restoring force generated by the torsion spring during deformation is changed, and the effect of adjusting the speed of the swing arm assembly 2 to reset after power off is realized. The setting of the top plate 5 not only enhances the stability of the swing gate structure, but also provides a fixed anchor point for the torsion spring, ensuring the accurate action of the torsion spring during the resetting process. The setting of the fixing hole allows the tension of the torsion spring to be adjusted according to actual needs to adapt to different working environments and use requirements. In addition, the design of the fixing hole also simplifies the installation and maintenance process of the torsion spring, reducing maintenance time and cost. The end of the torsion spring can be directly inserted into the fixing hole, or it can be bent to form a barb to hook the side wall of the fixing hole to realize fixation, which can be selected according to actual needs. In summary, through the combination of the top plate 5 and the fixing hole, a stable and adjustable working environment is provided for the torsion spring, which helps to improve the overall performance and service life of the cylindrical swing gate 1000.
[0035] In an optional embodiment, please refer to Figure 2 The cylindrical swing gate 1000 further comprises a clutch 6 and an output shaft 7, the clutch 6 is installed on the base 1, the two ends of the clutch 6 in the axial direction are respectively connected with the output end of the driving member 3 and the output shaft 7, and one end of the output shaft 7 away from the clutch 6 is connected with the rotating cylinder 21. Through the use of the clutch 6, a flexible power connection mode is provided for the cylindrical swing gate 1000. The presence of the clutch 6 allows quick disconnection of power transmission when needed (such as maintenance or emergency), thereby realizing manual control of the rotating cylinder 21. This quick switching capability improves the safety and operability of the cylindrical swing gate 1000. At the same time, the design of the clutch 6 also helps to protect the driving system from damage caused by overload or locked rotor, prolonging the service life of the driving system. In addition, the use of the clutch 6 can also reduce noise and vibration, improving the smoothness of the operation of the cylindrical swing gate 1000. The design of the output shaft 7 provides a stable connection mode to ensure effective transmission of power, and the connection away from the clutch 6 also helps to reduce space occupation, making the entire cylindrical swing gate 1000 structure more compact.
[0036] In an optional embodiment, in order to facilitate the support and installation of the components inside the cylindrical swing gate 1000, please refer to Figures 1 to 3, the base 1 includes a base plate 11, a first support plate 12, a second support plate 13, a first support column 14, and a second support column 15. The first support column 14 is installed above the base plate 11 in the vertical direction. The first support plate 12 is installed at the end of the first support column 14 away from the base plate 11. The second support column 15 is installed above the first support plate 12 in the vertical direction. The second support plate 13 is installed at the end of the second support column 15 away from the first support plate 12. The clutch 6 is installed on the first support plate 12, and the connecting piece 41 is installed on the second support plate 13. The structural design of the base 1 provides a stable support platform, enabling the entire cylindrical swing gate 1000 to operate stably in various environments. By installing the clutch 6 and the connecting piece 41 on different support plates, the design achieves functional zoning, reduces mutual interference between components, and improves system stability and reliability. The vertical installation of the first support column 14 and the second support column 15 provides a stable installation position for the clutch 6 and the connecting piece 41, and also facilitates the installation and maintenance of components. In addition, this structural design helps to distribute the load and reduce the pressure on individual components, thereby prolonging the service life of the entire base 1. Through the optimization of this structure, the overall performance of the cylindrical swing gate 1000 is improved, not only increasing the stability of the system, but also reducing maintenance costs, making the cylindrical swing gate 1000 more reliable and durable in long-term use.
[0037] Further, please refer to Figures 1 to 3 , the base plate 11 includes a bottom plate 111, an outer shell 112, a third support column 113, a bearing seat 114, and a bearing 115. The third support column 113 is installed on the bottom plate 111 in the vertical direction. The bearing seat 114 is connected to the end of the third support column 113 away from the bottom plate 111. The bearing 115 is sleeved on the bearing seat 114. The rotating cylinder 21 is sleeved on the outer edge of the bearing 115. The outer shell 112 is installed on the bottom plate 111 and wrapped around the outer edge of the third support column 113. The structure of the base plate 11 provides a solid foundation and stable support, enabling the cylindrical swing gate 1000 to remain stable during operation. The design of the third support column 113 and the bearing seat 114 provides precise positioning and stable support for the rotating cylinder 21, ensuring the accuracy and reliability of the swing arm 22. The use of the bearing 115 reduces friction during the rotation of the rotating cylinder 21, reduces energy consumption, and improves the operating efficiency of the cylindrical swing gate 1000. The design of the outer shell 112 not only protects the internal components but also provides a neat appearance, making the swing gate better integrated into the surrounding environment. The bottom plate 111 has multiple mounting holes around the edge to facilitate the installation and fixation of the base plate 11 on various installation bases. The installation method of the outer shell 112 also facilitates the maintenance and repair work of the swing gate. This design of the base plate 11 structure improves the stability and durability of the swing gate through precise mechanical layout and reasonable material selection, while also reducing maintenance and operating costs.
[0038] In an optional embodiment, to facilitate the adjustment of the rotation angle of the swing arm assembly 2, please refer to Figure 2 The cylindrical swing gate 1000 further includes a limiting assembly 8, which comprises a first limiting piece 81 connected to the output shaft 7 and a second limiting piece 82 connected to the second support plate 13. The first limiting piece 81 can rotate with the output shaft 7 and abut against the second limiting piece 82 to limit the rotation of the output shaft 7. The addition of the limiting assembly 8 provides precise control over the opening and closing rotation of the cylindrical swing gate 1000 and the power-off reset, ensuring that the rotation of the output shaft 7 is within a certain range and preventing damage or safety accidents caused by excessive rotation. This improves the safety and reliability of the cylindrical swing gate 1000, especially in high-frequency operations or harsh environments. The limiting assembly 8 effectively protects the key components of the cylindrical swing gate 1000, extending the service life of the equipment. Through the cooperation of the first limiting piece 81 and the second limiting piece 82, the movement of the cylindrical swing gate 1000 is precisely limited, reducing the likelihood of damage caused by misoperation or mechanical failure. This design not only improves the stability of the cylindrical swing gate 1000 but also reduces maintenance costs and the failure rate of components.
[0039] Further, the first limiting piece 81 is a limiting block that is sleeved on the output shaft 7, and the second limiting piece 82 is a fixed block that is connected to the second support plate 13 using fasteners. The sleeving of the limiting block on the output shaft 7 allows it to rotate with the output shaft 7. Optionally, an opening can be formed on the limiting block. By sleeving the limiting block on the output shaft 7 and passing fasteners such as bolts or screws through both sides of the opening, and adjusting the size of the opening to adjust the tightness of the connection between the limiting piece and the output shaft 7, the connection between the limiting piece and the output shaft 7 can be achieved, and the adaptability of the limiting piece can be improved to facilitate the installation of the limiting piece on output shafts 7 of different sizes. By limiting the excessive rotation of the output shaft 7 through the abutment of the limiting block and the fixed block, the safety of the cylindrical swing gate 1000 is improved, preventing mechanical failures or safety accidents caused by excessive rotation of the output shaft 7. The fastener connection between the fixed block and the second support plate 13 provides stable installation, ensuring the stability and reliability of the limiting assembly 8 during the operation of the cylindrical swing gate 1000. In addition, the fastener connection allows for quick disassembly and adjustment, making it easier to install and maintain the limiting assembly 8. Through precise physical limitation and stable installation, the stability and safety of the cylindrical swing gate 1000 are improved, while maintenance costs and operational risks are reduced.
[0040] In an optional embodiment, please refer to Figures 1 to 3The cylindrical swing gate 1000 further comprises an inductor 9 installed on the shell 112 and electrically connected with the driving member 3. The addition of the inductor 9 enables the cylindrical swing gate 1000 to respond to external signals such as infrared induction, radio frequency identification, etc., to realize automatic management. The intelligent level of the cylindrical swing gate 1000 is improved, manual intervention is reduced, and the passing efficiency is improved. At the same time, the use of the inductor 9 also enhances the safety of the cylindrical swing gate 1000, which can effectively prevent unauthorized passing. In addition, the inductor 9 can also be linked with other security systems such as monitoring systems, alarm systems, etc., to provide more comprehensive security protection. The installation mode of the shell 112 also facilitates the maintenance and repair work of the inductor 9.
[0041] In an optional embodiment, referring to Figure 1 and Figure 2 The swing arm assembly 2 further comprises a connecting head 23 and a decorative cover 24. The connecting head 23 is arranged on the side wall of the rotating cylinder 21, the swing arm 22 is sleeved on the connecting head 23, and the decorative cover 24 is arranged on the connecting part of the connecting head 23 and the swing arm 22. The addition of the connecting head 23 and the decorative cover 24 enhances the structural strength of the swing arm assembly 2 and improves the overall aesthetics of the swing gate. The design of the connecting head 23 provides a stable connection point, so that the swing arm 22 can be reliably connected with the rotating cylinder 21, ensuring the stability and reliability of the swing arm 22. The use of the decorative cover 24 not only protects the connecting part from the external environment, reduces wear and corrosion, but also provides a neat appearance, so that the swing gate can better integrate into the surrounding environment. Through the combination of the connecting head 23 and the decorative cover 24, the stability, durability and aesthetics of the swing gate are improved, and the maintenance cost and operation risk are also reduced.
[0042] The above description is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation or direct / indirect application in other related technical fields based on the technical concept of the present application and the contents of the present application specification and drawings are included in the patent protection scope of the present application.
Claims
1. A cylinder swing gate, characterized in that, The cylinder pendulum lock comprises a base, a swing arm assembly, a driving member, a reset assembly, a limiting assembly, and an inductive member. The swing arm assembly comprises a rotating cylinder and a swing arm. The rotating cylinder is arranged above the base and rotationally connected with the base. The swing arm is connected with the side wall of the rotating cylinder. The driving member is arranged in the mounting cavity. The output end of the driving member is connected with the rotating cylinder and can drive the rotating cylinder to rotate along the base.
2. The cylinder pendulum gate according to claim 1, wherein The reset assembly is arranged in the mounting cavity.
3. The cylinder pendulum gate according to claim 2, wherein The reset assembly comprises a connecting member and an elastic reset member.
4. The cylinder pendulum gate according to any one of claims 1 to 3, characterized in that The connecting member is arranged on the base.
5. The cylinder pendulum gate according to claim 4, wherein The elastic reset member is connected with the connecting member and the rotating cylinder. When the rotating cylinder rotates, the elastic reset member can be elastically deformed.
6. The cylinder pendulum gate according to claim 5, wherein The connecting member is a sleeve.
7. The cylinder pendulum gate according to claim 6, wherein The elastic reset member is a torsion spring.
8. The cylinder pendulum gate according to claim 7, wherein The torsion spring is arranged around the sleeve.
9. The cylinder pendulum gate according to claim 7, wherein The cylinder pendulum lock further comprises a top plate.
10. The cylinder pendulum gate according to claim 1, wherein The top plate is connected with the rotating cylinder. The periphery of the top plate is provided with a plurality of fixing holes. The end of the torsion spring away from the base is clamped in one of the fixing holes. The cylinder pendulum lock further comprises a clutch and an output shaft. The clutch is arranged on the base. The two ends of the clutch in the axial direction are respectively connected with the output end of the driving member and the output shaft. The end of the output shaft away from the clutch is connected with the rotating cylinder. The base comprises a base plate, a first support plate, a second support plate, a first support column, and a second support column. The first support column is arranged above the base plate in the vertical direction. The first support plate is arranged on the end of the first support column away from the base plate. The second support column is arranged above the first support plate in the vertical direction. The second support plate is arranged on the end of the second support column away from the first support plate. The clutch is arranged on the first support plate. The connecting member is arranged on the second support plate. The base plate comprises a bottom plate, an outer shell, a third support column, a bearing seat, and a bearing. The third support column is arranged on the bottom plate in the vertical direction. The bearing seat is connected with the end of the third support column away from the bottom plate. The bearing is sleeved on the bearing seat. The rotating cylinder is sleeved on the outer edge of the bearing. The outer shell is arranged on the bottom plate and around the outer edge of the third support column. The cylinder pendulum lock further comprises a limiting assembly. The limiting assembly comprises a first limiting member and a second limiting member. The first limiting member is connected with the output shaft. The second limiting member is connected with the second support plate. The first limiting member can rotate with the output shaft and abut against the second limiting member to limit the rotation of the output shaft. The first limiting member is a limiting block. The limiting block is sleeved on the output shaft. The second limiting member is a fixed block. The fixed block is connected with the second support plate by using fasteners. The cylinder pendulum lock further comprises an inductive member. The inductive member is arranged on the outer shell and electrically connected with the driving member. The swing arm assembly further comprises a connecting head and a decorative cover. The connecting head is arranged on the side wall of the rotating cylinder. The swing arm is sleeved on the connecting head. The decorative cover is arranged on the connecting part of the connecting head and the swing arm.