Torsion damper, heliostat column structure and heliostat

Abstract

The application provides a torsion buffer, comprising a first base, a second base and a plurality of buffer members, the torsion buffer has an axial line, the first base and the second base can rotate relative to the axial line, the buffer members connect the first base and the second base, the buffer members can be extended and contracted, and the buffer members are scattered along the axial line, and the application also provides a heliostat stand and a heliostat. The torsion buffer of the application connects the first base and the second base through the buffer members, when external force acts on at least one of the first base and the second base, the first base and / or the second base transmits the force to the buffer members, the buffer members are used for energy absorption and energy release conversion, and bidirectional torsion buffering is realized; when the heliostat frame is subjected to wind load and a rotating mechanism runs, the torsion buffer has a rotating tendency along the direction of the wind load to buffer most of the torsion, so that the influence of the instantaneous moment on the stand is reduced or avoided.

Description

Technical Field

[0001] This application belongs to the field of heliostats, specifically relating to a torsion buffer, a heliostat column structure, and a heliostat. Background Technology

[0002] With the continuous maturation of concentrated solar power (CSP) technology, the demand for CSP solar power generation has increased significantly, leading to a corresponding increase in the demand for heliostats. During installation, heliostats require a rotating mechanism and a secure anchor to the ground to ensure stable operation. In related technologies, most heliostat anchors utilize metal pipe piles with connecting flanges. However, due to the limited rigidity of the metal pipe pile material, the heliostat frame experiences significant wind loads during operation due to sudden high wind speeds. This generates substantial azimuth moments, which are transmitted to the anchor, increasing instantaneous torque. Repeated occurrences of this can cause the anchor to twist and deform, potentially leading to failure. Furthermore, significant lateral bending deformation under large wind loads increases the tilting moment, causing frame vibration and reduced solar tracking accuracy. Summary of the Invention

[0003] This application aims to at least partially solve one of the technical problems in the related art. To this end, the main technical solutions adopted in this application include:

[0004] In a first aspect, this application provides a torque buffer, including a first base, a second base, and a plurality of buffer members. The torque buffer has an axis, and the first base and the second base are rotatable relative to each other around the axis. The buffer members connect the first base and the second base, and the buffer members are telescopic. The plurality of buffer members are distributed in a radiating pattern along the axis.

[0005] The torsion buffer provided in this application connects a first base and a second base through a buffer member. When an external force is applied to at least one of the first base and the second base, the first base and / or the second base will transmit the force to the buffer member, and the buffer member will convert energy absorption and release to achieve bidirectional torsion buffering.

[0006] Secondly, this application provides a heliostat support column, including a torque buffer, a column, and a rotation mechanism. The torque buffer includes a first base, a second base, and a plurality of buffer members. The torque buffer has an axis, and the first base and the second base are rotatable relative to each other around the axis. The buffer members connect the first base and the second base, and the buffer members are telescopic. The plurality of buffer members are distributed in a radiating pattern along the axis.

[0007] The torque buffer connects the column and the slewing mechanism. One of the first base and the second base is connected and fixed to the column, and the other is connected and fixed to the slewing mechanism.

[0008] The heliostat column provided in this application connects the column and the rotation mechanism through a torque buffer. When the rotation mechanism transmits the force to the torque buffer, the buffer element of the torque buffer absorbs and releases energy. It can act as a buffer zone between the rotation mechanism and the column to buffer the impact of large torque on the column and avoid the column bearing large torque.

[0009] Thirdly, this application provides a heliostat, including a torque buffer, a column, a rotation mechanism, a frame, and a mirror assembly. The torque buffer includes a first base, a second base, and a plurality of buffer members. The torque buffer has an axis, and the first base and the second base are rotatable relative to each other around the axis. The buffer members connect the first base and the second base, and the buffer members are telescopic. The plurality of buffer members are distributed in a radiating pattern along the axis.

[0010] The rotating mechanism includes a fixed end and an output end. One of the first base and the second base is connected to and fixed to the fixed end, and the other is connected to and fixed to the column. The output end is connected to and fixed to the mirror frame, and the mirror assembly is mounted on the mirror frame.

[0011] The heliostat provided in this application adopts a heliostat column structure with a torque buffer. When the heliostat frame is subjected to wind load and the rotation mechanism generates a large azimuth torque and tilting torque due to the large moment of inertia, the torque buffer will rotate in the direction of the wind load to buffer most of the torque, thereby reducing or avoiding the influence of the instantaneous torque on the column. Attached Figure Description

[0012] 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.

[0013] Figure 1 This is a structural diagram of the torque buffer provided in the embodiments of this application;

[0014] Figure 2 An exploded view of the torque buffer provided in the embodiments of this application;

[0015] Figure 3 This is a structural diagram of the connecting shaft provided in an embodiment of this application;

[0016] Figure 4a A structural diagram of the buffer provided in the embodiment of the application;

[0017] Figure 4b A structural diagram of another buffer provided in the embodiments of the application;

[0018] Figure 5 A partial structural diagram of the buffer provided in the embodiment of the application;

[0019] Figure 6 The structural diagram of the heliostat column provided in the embodiment of the application;

[0020] Figure 7 This is a structural diagram of the heliostat provided in the embodiment of the application. Detailed Implementation

[0021] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0022] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0023] With the continuous maturation of solar thermal power generation technology, the demand for solar thermal power generation has increased significantly, and the demand for heliostats has also increased accordingly. During installation, heliostats need to be securely fixed to the ground via a rotating mechanism and a column to ensure the normal and stable operation of the entire heliostat.

[0024] In related technologies, most heliostat columns are constructed using metal pipe piles with upper and lower welded flanges. The lower flange connects to the ground, while the upper flange connects to the rotation mechanism. The entire heliostat frame is connected to the rotation mechanism, which provides rotational power to support the frame's rotational movement. The column, while supporting the entire frame, also needs to counteract the forces generated by the rotation mechanism to ensure the stable operation of the entire heliostat.

[0025] While existing heliostat columns are simple to manufacture and install, the impact of various torques generated by wind loads on the accuracy and stability of the heliostat cannot be ignored. Because the existing columns are rigid supports, the azimuth torque that needs to be counteracted under large wind loads and when bearing rotating heavy objects is also significant. In severe cases, this may lead to column failure, and significant deformation under wind loads will also affect the heliostat's tracking accuracy. Furthermore, due to the rigid support of the existing columns, the reaction force generated by rotation will act on the frame, causing vibrations that may loosen frame bolts and lead to a decrease in sun-tracking accuracy.

[0026] For this purpose, please refer to Figures 1 to 5This embodiment proposes a torque buffer, including a first base 1, a second base 2, and several buffer members 3. The torque buffer has a centerline l, and the first base 1 and the second base 2 are rotatable relative to each other around the centerline l. The buffer members 3 connect the first base 1 and the second base 2, and the buffer members 3 are expandable and contractible. The several buffer members 3 are distributed in a radiating pattern along the centerline l. This embodiment achieves the conversion of energy absorption to energy release through the torque buffer. The torque buffer is flexible and expandable. When subjected to a large torque, the first base 1 and / or the second base 2 transmit the torque to the buffer members 3. The buffer members 3 absorb energy and convert it into their own work to buffer most of the torque, thus achieving torque buffering.

[0027] refer to Figure 6 This embodiment also proposes a heliostat support column, including a torque buffer 100, a column 200, and a rotation mechanism 300. The torque buffer 100 includes a first base 1, a second base 2, and a plurality of buffer members 3. The torque buffer has an axis l. The first base 1 and the second base 2 can rotate relative to each other around the axis l. The buffer members 3 connect the first base 1 and the second base 2. The buffer members 3 are telescopic, and the plurality of buffer members 3 are distributed in a radiating pattern along the axis l. The torque buffer 100 connects the column 200 and the rotation mechanism 300. One of the first base 1 and the second base 2 is connected and fixed to the column 200, and the other is connected and fixed to the rotation mechanism 300.

[0028] In addition, refer to Figure 7 This embodiment also provides a heliostat, including a torque buffer 100, a column 200, a rotation mechanism 300, a frame 400, and a mirror assembly 500. The torque buffer 100 includes a first base 1, a second base 2, and several buffer members 3. The torque buffer has an axis l. The first base 1 and the second base 2 can rotate relative to each other around the axis l. The buffer members 3 connect the first base 1 and the second base 2. The buffer members 3 are telescopic, and the several buffer members 3 are distributed in a radiating pattern along the axis l. The rotation mechanism 300 includes a fixed end and an output end. One of the first base 1 and the second base 2 is connected to and fixed to the fixed end, and the other is connected to and fixed to the column 200. The output end is connected to and fixed to the frame 400. The mirror assembly 500 is mounted on the frame 400.

[0029] In this embodiment, the rotary mechanism 300 adopts a rotary reducer to adjust the azimuth angle of the frame 400.

[0030] The heliostat's support column is a rigid metal pipe pile. During wind loads and the operation of the rotating mechanism, the heliostat frame experiences significant azimuth and tilt moments due to its large moment of inertia, causing the frame to rotate and tilt. In this embodiment, the heliostat support column and heliostat utilize a torsion damper 100 to connect the support column 200 and the rotating mechanism 300. The first base 1, second base 2, and several buffer components 3 of the torsion damper 100 form a flexible structure with a "bidirectional torsion damping" function. The torsion damper 100 is installed above the support column 200. When the force generated by the wind load exceeds the supporting force generated by the buffer components 3, the buffer components 3 will expand and contract, causing the torsion damper 100 to rotate in the direction of the wind load. The wind load tends to buffer most of the torque, and at this time the instantaneous torque generated by the wind load on the column is less affected. When the force generated by the wind load is less than the supporting force generated by the buffer 3, the buffer 3 will return to its original position. The torque buffer 100 absorbs the kinetic energy brought by the external environment through the buffer 3 and converts it into its own potential energy to do work, thus realizing the conversion from energy absorption to energy release. This can greatly buffer the impact of the azimuth torque and tilt torque generated by the wind load on the frame on the column. The torque buffer 100 provided in this embodiment can act as a buffer zone between the rotating mechanism and the column to buffer the impact of large torque on the column, avoid the column from being subjected to large torque and causing deformation or even failure, and effectively extend the service life of the column to a certain extent.

[0031] Please refer to it again. Figure 2 In this embodiment, a portion of the first base 1 is located at the center of the second base 2, and several buffer members 3 are distributed in a radiating pattern with the portion of the first base 1 located at the center of the second base 2 as the center. For details, please refer again. Figure 2 The first base 1 includes a connecting shaft 11, which is located at the center of the second base 2 and is rotatably engaged with the second base 2. One end of each buffer element 3 is rotatably connected to the connecting shaft 11, and the other end is connected to the second base 2. Several buffer elements 3 are evenly distributed around the axis 1. This even distribution of buffer elements 3 ensures that the impact force borne by each buffer element 3 is relatively balanced, helping to reduce performance degradation caused by excessive wear or uneven stress on a single buffer element 3, thereby improving the overall buffering effect and ensuring the safe and stable operation of the equipment under impact loads.

[0032] More specifically, please combine again Figure 3In this embodiment, the connecting shaft 11 includes a first shaft segment 111, a boss portion 112, and a second shaft end 113. The boss portion 112 is located between the first shaft segment 111 and the second shaft end 113. The buffer member 3 is provided with a rotatable connecting hole 3a, and the boss portion 112 is provided with a connecting hole 11a corresponding to the rotatable connecting hole 3a. The buffer member 3 is rotatably connected to the boss portion 112 through a connector (not shown in the figure), the rotatable connecting hole 3a, and the connecting hole 11a. In this embodiment, the first shaft segment 111, the boss portion 112, and the second shaft end 113 are coaxially arranged. In some embodiments, the first shaft segment 111, the boss portion 112, and the second shaft end 113 are a single piece, for example, formed by machining. In other embodiments, at least a portion of the first shaft segment 111, the boss portion 112, and the second shaft end 113 are connected and fixed by mechanical connection. The method of mechanical connection is not limited, for example, it can be connected by fasteners.

[0033] In this embodiment, the buffer element 3 is a damping element to achieve the purpose of vibration reduction and energy dissipation. In this embodiment, the number of buffer elements 3 is greater than or equal to 2, without specific limitation. It can be 2, 3, 4, 5, 6, etc. The more buffer elements 3 are set, the stronger the buffering effect. The selection can be made according to actual needs.

[0034] Furthermore, please refer again to Figure 4 and Figure 5 In this embodiment, the buffer 3 is a hydraulic buffer structure. The buffer 3 includes a hydraulic cylinder 31 and a hydraulic rod 32. The hydraulic rod 32 has a piston 321, which is located inside the hydraulic cylinder 31 and sealed to it. The piston 321 divides the hydraulic cylinder 31 into two sealed chambers C1 and C2. The hydraulic rod 32 extends out of the hydraulic cylinder 31 and is rotatably connected to the boss 112. The hydraulic rod 32 is also sealed to the hydraulic cylinder 31 to prevent the medium inside the hydraulic cylinder 31 from flowing out. During operation, the sealed chambers C1 and C2 of the torque buffer are filled with a buffer medium, such as hydraulic oil. The hydraulic oil absorbs the kinetic energy from the outside and converts it into its own internal energy to do work, thus achieving buffering. In this embodiment, the buffer 3, which is a hydraulic buffer structure, is connected to a first base 1 and a second base 2 that can rotate relative to each other. The buffer 3 is distributed in a radiating pattern with the first base 1 as the center, forming a "hydraulic buffer structure" device.

[0035] In some embodiments, the hydraulic rod 32 is provided with a rotatable connection hole 3a at the end away from the hydraulic cylinder 31, and the boss portion 112 is provided with a corresponding connection hole 11a. The torque buffer also includes a connector 4, which passes through the rotatable connection hole 3a and the connection hole 11a to connect the hydraulic rod 32 and the boss portion 112, which is not shown in the figure.

[0036] In other implementations, please refer again. Figure 2 and combined Figure 4a and Figure 4b The buffer 3 further includes a connecting rod 33, one end of which is hinged to the boss portion 112. Specifically, the connecting rod 33 is provided with a rotatable connection hole 3a, and the boss portion 112 is provided with a sliding groove 11b at each rotatable connection point with the connecting rod 33. The connecting rod 33 is at least partially located within the sliding groove 11b. The connecting rod 33 can rotate within the sliding groove 11b about the connecting member 4 as the central axis. In other words, the connection hole 11a is located at the location of the sliding groove 11b. In this embodiment, the connecting rod 33 has a plate-like structure, and its bottom surface and the upper surface of the location of the sliding groove 11b are both smooth planes. During the operation of the buffer 3, the bottom surface of the connecting rod 33 slides in contact with the upper surface of the location of the sliding groove 11b. At the same time, the sliding groove 11b is fan-shaped, with its opening angle facing the hydraulic cylinder 31. The two side walls of the sliding groove 11b are used to limit the connecting rod 33. In addition, the plate-like structure of the connecting rod 33 can reduce the thickness of the sliding groove 11b to a certain extent. In one embodiment, the other end of the connecting rod 33 is hinged to the hydraulic rod 32, and the hydraulic cylinder 31 is connected to and fixed to the second base 2. In this case, the hinge rotation axes at both ends of the connecting rod 33 are arranged parallel to each other. Figure 4a As shown. In another embodiment, the other end of the connecting rod 33 is fixedly connected to the hydraulic rod 32, and the hydraulic cylinder 31 is hinged to the second base 2. In this case, the hinge rotation axis of the hydraulic cylinder 31 and the second base 2 is parallel to the hinge rotation axis of the connecting rod 33 and the boss portion 112, as shown. Figure 4b As shown.

[0037] Of course, in some other embodiments, the cross-sectional shape of the hydraulic rod 32 can be directly rectangular, and it can be rotatably connected to the boss portion 112 via the connector 4.

[0038] In the above embodiment, the connector 4 is mainly used at the hinge point between the buffer 3 and the boss 112 to form a hinge connection and achieve a static fixed connection, while the buffer 3 and the boss 112 can rotate relative to each other. Specifically, the connector 4 can be a pin.

[0039] In this embodiment, the second base 2 is provided with a cylinder mounting position 2a, and the hydraulic cylinder 31 is at least partially located in the cylinder mounting position 2a, thereby limiting the hydraulic cylinder 31.

[0040] In this embodiment, the hydraulic cylinder 31 is fixedly installed at the cylinder mounting position 2a, as shown below. Figure 2 and Figure 4aAs shown, the second base 2 includes a base 21 and a cover 22. The base 21 and the cover 22 are connected and fixed. The cylinder mounting position 2a is located at least one of the base 21 and the cover 22. In one specific embodiment, the cylinder mounting position 2a is a receiving groove. The base 21 and the cover 22 are each provided with the receiving groove on one side of their opposite surfaces. The receiving grooves of the base 21 and the cover 22 correspond to form the cylinder mounting position. After the hydraulic cylinder 31 is located in the corresponding cylinder mounting position, it is pressed and fixed by the flange connection between the base 21 and the cover 22.

[0041] In addition, please refer to again Figure 2 The torque damper also includes bearings B1 and B2. The base 21 and the cover 22 are each rotatably connected to the connecting shaft 11 via bearings. Specifically, the bearings include a first bearing B1 and a second bearing B2. The connecting shaft 11 is connected to the base 21 via the first bearing B1, and to the cover 22 via the second bearing B2. In this embodiment, the connecting shaft 11 is connected to the base 21 and the cover 22 via bearings B1 and B2, which can reduce friction and make rotation smoother.

[0042] Please refer to it again. Figure 2 In this embodiment, the first base 1 further includes a connecting plate 12, which is located outside the second base 2 and is connected and fixed to one end of the connecting shaft 11. In some specific embodiments, the connecting plate 12 is connected and fixed to the rotary mechanism 300; the second base 2 is connected and fixed to the column 200. In this embodiment, the connecting plate 12 is connected to the fixed end flange of the rotary mechanism 300, and the second base 2 is connected to the flange of the column 200. When the heliostat frame is subjected to a large instantaneous wind load, the azimuth and tilt moments increase, causing the frame to rotate and tilt. Because this torsion damper is flexible and located above the column 200, the frame transmits the force to the connecting plate 12 of the first base 1. The connecting plate 12 then transmits the force to the connecting shaft 11, which in turn transmits the force to the hydraulic buffer 3. When the force generated by the wind load exceeds the internal energy of the hydraulic oil in the buffer 3, the torsion damper will rotate in the direction of the wind load to buffer most of the torque. At this time, the instantaneous torque generated by the wind load on the column 200 is less affected. When the wind load is less than the internal energy of the hydraulic oil, the torsion damper returns to its original position, remaining in a semi-rigid, semi-flexible state. This embodiment, by setting a torsion damper, significantly reduces and avoids the torsional deformation, vibration, and tremor of the column caused by the azimuth moment.

[0043] Some of the technical implementation methods described above can be combined or replaced.

[0044] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The technical principles of this application have been described above in conjunction with specific embodiments. However, it should be noted that these descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, other specific embodiments or equivalent substitutions of this application that can be conceived by those skilled in the art without creative effort will fall within the scope of protection of this application.

Claims

1. A torque damper, characterized in that: The device includes a first base, a second base, and several buffer members. The torsion buffer has an axis, and the first base and the second base are rotatable relative to each other around the axis. The buffer members connect the first base and the second base, and the buffer members are telescopic. The several buffer members are distributed in a radiating pattern along the axis. The first base includes a connecting shaft, which is rotatably engaged with the second base. The connecting shaft includes a first shaft segment, a boss portion, and a second shaft end, with the boss portion located between the first shaft segment and the second shaft end. The buffer also includes a connecting rod, a hydraulic cylinder, and a hydraulic rod. The hydraulic rod has a piston located inside the hydraulic cylinder and sealingly fitted with the hydraulic cylinder. The piston divides the hydraulic cylinder into two sealed chambers. One end of the connecting rod is hinged to a boss portion, and the hydraulic rod extends out of the hydraulic cylinder and is hinged to the other end of the connecting rod. The boss portion is provided with a sliding groove at each rotatable connection position with the connecting rod, and the connecting rod is at least partially located within the sliding groove. The second base is provided with a cylinder mounting position. The second base includes a base and a cover. The base and the cover are connected and fixed. The cylinder mounting position is located in at least one of the base and the cover. The hydraulic cylinder is at least partially located in the cylinder mounting position.

2. The torque buffer according to claim 1, characterized in that: The connecting shaft is located at the center of the second base, and the buffer components are evenly distributed around the axis.

3. The torque buffer according to claim 2, characterized in that: The buffer component is provided with a rotatable connection hole, and the boss is provided with a connection hole corresponding to the rotatable connection hole. The buffer component is rotatably connected to the boss through a connector, the rotatable connection hole, and the connection hole.

4. The torque buffer according to claim 1, characterized in that: The torque damper also includes a bearing, and the base and the cover are rotatably connected to the connecting shaft through the bearing; The first base also includes a connecting plate located outside the second base, and the connecting plate is connected to and fixed to one end of the connecting shaft.

5. A heliostat support column, characterized in that: The device includes a torque buffer, a column, and a rotary mechanism. The torque buffer includes a first base, a second base, and several buffer members. The torque buffer has an axis. The first base and the second base are capable of rotating relative to each other around the axis. The buffer members connect the first base and the second base. The buffer members are telescopic, and the several buffer members are distributed in a radiating pattern along the axis. The first base includes a connecting shaft, which is rotatably engaged with the second base. The connecting shaft includes a first shaft segment, a boss portion, and a second shaft end, with the boss portion located between the first shaft segment and the second shaft end. The buffer also includes a connecting rod, a hydraulic cylinder, and a hydraulic rod. The hydraulic rod has a piston located inside the hydraulic cylinder and sealingly fitted with the hydraulic cylinder. The piston divides the hydraulic cylinder into two sealed chambers. One end of the connecting rod is hinged to a boss portion, and the hydraulic rod extends out of the hydraulic cylinder and is hinged to the other end of the connecting rod. The boss portion is provided with a sliding groove at each rotatable connection position with the connecting rod, and the connecting rod is at least partially located within the sliding groove. The second base is provided with a cylinder mounting position. The second base includes a base and a cover. The base and the cover are connected and fixed. The cylinder mounting position is located in at least one of the base and the cover. The hydraulic cylinder is at least partially located in the cylinder mounting position. The torque buffer connects the column and the slewing mechanism. One of the first base and the second base is connected and fixed to the column, and the other is connected and fixed to the slewing mechanism.

6. The heliostat column according to claim 5, characterized in that: The first base includes a connecting plate, which is connected to and fixed to the rotary mechanism; the second base is connected to and fixed to the column.

7. A heliostat, characterized in that: The device includes a torque buffer, a column, a rotating mechanism, a mirror frame, and a mirror assembly. The torque buffer includes a first base, a second base, and several buffer members. The torque buffer has an axis, and the first base and the second base are rotatable relative to each other around the axis. The buffer members connect the first base and the second base, and the buffer members are telescopic. The several buffer members are distributed in a radiating pattern along the axis. The first base includes a connecting shaft, which is rotatably engaged with the second base. The connecting shaft includes a first shaft segment, a boss portion, and a second shaft end, with the boss portion located between the first shaft segment and the second shaft end. The buffer also includes a connecting rod, a hydraulic cylinder, and a hydraulic rod. The hydraulic rod has a piston located inside the hydraulic cylinder and sealingly fitted with the hydraulic cylinder. The piston divides the hydraulic cylinder into two sealed chambers. One end of the connecting rod is hinged to a boss portion, and the hydraulic rod extends out of the hydraulic cylinder and is hinged to the other end of the connecting rod. The boss portion is provided with a sliding groove at each rotatable connection position with the connecting rod, and the connecting rod is at least partially located within the sliding groove. The second base is provided with a cylinder mounting position. The second base includes a base and a cover. The base and the cover are connected and fixed. The cylinder mounting position is located in at least one of the base and the cover. The hydraulic cylinder is at least partially located in the cylinder mounting position. The rotating mechanism includes a fixed end and an output end. One of the first base and the second base is connected to and fixed to the fixed end, and the other is connected to and fixed to the column. The output end is connected to and fixed to the mirror frame, and the mirror assembly is mounted on the mirror frame.

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