Rotary screen assembly

Abstract

The utility model discloses a rotary screen assembly. The rotary screen assembly comprises a display screen, a driving mechanism and a rotation detection mechanism, the display screen can rotate along the rotation axis, and in the direction of the rotation axis, the two ends of the display screen are a driving end and a driven end respectively; the driving mechanism is connected with the driving end and used for driving the display screen to rotate; the rotation detection mechanism is connected with the driven end and used for detecting the rotation angle of the display screen. According to the scheme, the driving mechanism and the rotation detection mechanism are connected to the two ends of the display screen respectively, so that the display screen is driven in a single-side mode, and compared with a traditional double-side driving mode, the problem that the rotation stress of the screen is unbalanced due to asynchronous double-side driving is solved, and meanwhile the cost is reduced. The rotation detection mechanism can measure the rotation angle of the display screen so as to guarantee accurate control of the rotation position of the display screen.

Description

Technical Field

[0001] The present application relates to the technical field of display screen rotation detection, and in particular to a rotating screen assembly. Background Art

[0002] Now more and more cars are equipped with on-board motion screens, which are usually installed on the roof, allowing the co-pilot and rear passengers to enjoy the video and audio experience while driving. Due to the limited space inside the car, this type of display screen generally needs to be folded to a position parallel to the roof when not in use, and the actuator for the screen flipping requires a power drive system, and also has the function of stopping the screen at any position within a certain angle range.

[0003] The power drive systems of the existing car-mounted motion screens on the market all use a dual-motor solution, that is, a set of motors are arranged on each side of the display screen, and the driven shafts of the two sets of motors are connected and fixed to the display screen at the same time. When the motion screen needs to be opened or folded, the two motors work synchronously to drive the rotation of the motion screen together.

[0004] This drive system has several disadvantages. The first is that the dual motors have very high requirements for electronic control technology. It is difficult to achieve completely synchronous movement of the motors at both ends, which will cause unbalanced force on the rotation of the screen, and ultimately there will be problems such as noise, vibration and short life. The second is the cost requirements of the dual motor solution. Not only are the two motors themselves expensive, but the matching reduction gear mechanism also requires two sets of the same, which increases its cost. And due to the lack of a detection mechanism for the rotation angle of the display screen, it is difficult to control the rotation angle of the display screen. Utility Model Content

[0005] The present application provides a rotating screen assembly to solve the problem that dual motors are difficult to fully synchronize and the problem that the rotation angle of the rotating screen is difficult to control.

[0006] In order to solve the above technical problems, the technical solution provided by this application is:

[0007] A rotating screen assembly comprises a display screen, a driving mechanism and a rotating detection mechanism; the display screen can rotate along a rotating axis, and in the direction of the rotating axis, the two ends of the display screen are respectively a driving end and a driven end; the driving mechanism is connected to the driving end, and the driving mechanism is used to drive the display screen to rotate; the rotating detection mechanism is connected to the driven end, and is used to detect the rotation angle of the display screen, and it comprises a connecting frame part and a detection part, the connecting frame part comprises a first fitting part and a first bending part, the first fitting part is used to fit and fix the display screen, the first bending part is bent relative to the first fitting part in a direction perpendicular to the rotating axis in a direction away from the display screen, and the detection part is connected to the first bending part so that the positive projection of the detection part on the display screen at least partially overlaps with the display screen.

[0008] The beneficial effects of this application are:

[0009] The rotating screen assembly provided by the present application is connected to a driving mechanism and a rotating detection mechanism at both ends of the display screen, respectively. Therefore, the driving mode of the display screen in the present application is a unilateral drive. Compared with the traditional bilateral driving mode, the problem of unbalanced rotational force of the display screen caused by the asynchronous bilateral driving is solved, thereby solving the problems of noise, vibration and short life caused by the unbalanced rotational force of the display screen. At the same time, the cost is also reduced due to the reduction of the driving structure on one side. At the same time, a rotating detection mechanism is set at the driven end of the display screen along its rotation axis, and the rotation angle of the display screen can be measured to ensure the precise control of the rotation position of the display screen. In addition, the rotating detection mechanism includes a connecting frame part and a detection part, and the detection part is connected to the display screen through the connecting frame part. The positive projection of the detection part on the display screen at least partially overlaps with the display screen, which can reduce the axial size of the overall structure composed of the display screen and the rotating detection mechanism, and further reduce the overall axial size of the rotating screen assembly of the present application.

[0010] According to one embodiment of the present application, the driving mechanism includes a mounting frame portion and a driving portion, the mounting frame portion includes a second fitting portion and a second bending portion, the second fitting portion is used to fit and fix the display screen, the second bending portion is bent in a direction perpendicular to the rotation axis relative to the second fitting portion in a direction away from the display screen, and the driving portion is connected to the second bending portion so that the orthographic projection of the driving portion on the display screen at least partially overlaps with the display screen.

[0011] In this solution, the driving mechanism includes a mounting frame part and a driving part. The driving part is connected to the display screen through the mounting frame part. The orthographic projection of the driving part on the display screen at least partially overlaps with the display screen, which can reduce the axial dimension of the overall structure composed of the display screen and the driving mechanism, and further reduce the overall axial dimension of the rotating screen assembly of the present application.

[0012] According to an embodiment of the present application, the driving mechanism and the rotation detection mechanism are located on the same side of the display screen in a direction perpendicular to the rotation axis.

[0013] In this solution, the driving mechanism and the rotation detection mechanism are both hidden on the back of the display screen.

[0014] According to one embodiment of the present application, fixing holes are provided on the first fitting portion and the second fitting portion, and fasteners are passed through the fixing holes and connected to the display screen to achieve connection and fixation between the first fitting portion and the display screen, and connection and fixation between the second fitting portion and the display screen.

[0015] In this solution, the first fitting part and the display screen, as well as the second fitting part and the display screen are fixed to each other by the cooperation of the fastener and the fixing hole, and the connection method is simple and reliable.

[0016] According to one embodiment of the present application, the driving mechanism includes a driving end housing, a driving shaft, a motor and a gear reduction mechanism; the driving end housing is used to be fixedly connected to a fixed component; the gear reduction mechanism is located inside the driving end housing; the motor is located outside the driving end housing, and the output shaft of the motor extends into the driving end housing and is connected to the power input end of the gear reduction mechanism; one end of the driving shaft extends into the driving end housing and is connected to the power output end of the gear reduction mechanism, and the other end is fixedly connected to the second bending portion, and the central axis of the driving shaft coincides with the rotation axis.

[0017] In this solution, the power of the motor is transmitted to the drive shaft after being decelerated by the gear reduction mechanism. When the drive shaft rotates, the display screen is driven to rotate through the mounting frame portion fixed to the drive shaft.

[0018] According to one embodiment of the present application, the rotation detection mechanism includes a driven end housing, a driven shaft, a magnet and a magnetic sensitive element; the driven end housing is used to be fixedly connected to a fixed component; one end of the driven shaft extends into the driven end housing and is rotatably connected to the driven end housing, and the other end is fixedly connected to the first bending portion, and the central axis of the driven shaft coincides with the rotation axis; the magnet is located in the driven end housing, the magnet is connected to the driven shaft so as to rotate with the rotation of the driven shaft, and the magnet includes at least one pair of radially magnetized poles; the magnetic sensitive element is fixed in the driven end housing, the magnetic sensitive element is located on the central axis of the magnet, and the magnetic sensitive element and the magnet are spaced apart.

[0019] In this solution, the magnetic sensitive element is set on the central axis of the magnet and the two are set at intervals. When the driving mechanism drives the display screen to rotate, the display screen will drive the driven shaft to rotate synchronously. When the driven shaft rotates, it will drive the magnet to rotate. Therefore, when the magnet rotates, the rotation angle of the magnet is detected by the magnetic sensitive element, and then the rotation angle of the driven shaft and the display screen can be obtained. The magnet is used to generate magnetic flux lines, and the magnetic sensitive element is used to detect the rotation position (i.e., rotation angle) of the magnet according to the magnetic flux lines. Since the magnet includes at least one pair of radially magnetized poles and the magnetic sensitive element is located on the central axis of the magnet, when the magnet rotates, the magnetic sensitive element can respond to the change in the direction of the magnetic flux lines of the magnet to detect the rotation position of the magnet. The rotation of the magnet is driven by the rotation of the driven shaft, so the rotation position of the display screen can be indirectly measured by measuring the rotation position of the magnet. In this solution, the rotation position of the magnet can be detected by sensing the change in the direction of the magnetic flux lines of the magnet through the magnetic sensitive element, and the detection result is more accurate.

[0020] According to one embodiment of the present application, the rotation detection mechanism also includes a first gear and a second gear; the first gear is located in the driven end housing and is fixedly sleeved on the driven shaft; the second gear is located in the driven end housing and is coaxially fixedly connected to the magnet, and the second gear is meshed with the outside of the first gear.

[0021] In this solution, through the power transmission of the first gear and the second gear, the magnet can be set on the radial outside of the driven shaft, thereby reducing the axial size of the rotation detection mechanism itself, and thus reducing the overall axial size of the rotating screen assembly of the present application.

[0022] According to one embodiment of the present application, the driving mechanism also includes a first damping component, which is used to achieve damped rotation of the driven shaft relative to the driven end housing; and / or the rotation detection mechanism also includes a second damping component, which is used to achieve damped rotation of the driving shaft relative to the driving end housing.

[0023] In this solution, the first damping component and the second damping component can provide a buffering and fixing effect to the motion display screen when it is flipped, and the display screen can be suspended at any position.

[0024] According to one embodiment of the present application, the first damping assembly includes a first damping friction plate group and a first damping fixed seat, the first damping fixed seat is used to be fixedly connected to the driven end housing, the first damping friction plate group includes at least one first fixed friction plate and at least one first rotating friction plate that are frictionally connected, the first fixed friction plate and the first rotating friction plate are both coaxially sleeved on the driven shaft, the first fixed friction plate is fixed to the first damping fixed seat, and the first rotating friction plate is fixed to the driven shaft, so that the first rotating friction plate rotates relative to the first fixed friction plate when the driven shaft rotates; and / or, the second damping assembly includes a second damping friction plate group and a second damping fixed seat, the second damping fixed seat is used to be fixedly connected to the driving end housing, the second damping friction plate group includes at least one second fixed friction plate and at least one second rotating friction plate that are frictionally connected, the second fixed friction plate and the second rotating friction plate are both coaxially sleeved on the driving shaft, the second fixed friction plate is fixed to the second damping fixed seat, and the second rotating friction plate is fixed to the driving shaft, so that the second rotating friction plate rotates relative to the second fixed friction plate when the driving shaft rotates.

[0025] According to one embodiment of the present application, the rotation detection mechanism also includes a first rotation limiting mechanism, the first rotation limiting mechanism includes a first stop protrusion and a first rotating plate, the first stop protrusion is fixed to the first damping fixing seat, and the first rotating plate is fixed to the first bending portion, so that when the first rotating plate rotates to the extreme position along with the driven shaft, it can be blocked by the first stop protrusion; and / or, the driving mechanism also includes a second rotation limiting mechanism, the second rotation limiting mechanism includes a second stop protrusion and a second rotating plate, the second stop protrusion is fixed to the second damping fixing seat, and the second rotating plate is fixed to the second bending portion, so that when the second rotating plate rotates to the extreme position along with the driving shaft, it can be blocked by the second stop protrusion.

[0026] In this solution, the first rotating piece can be blocked by the first stop protrusion when it rotates to the limit position along with the driven shaft, and the second rotating piece can be blocked by the second stop protrusion when it rotates to the limit position along with the driving shaft, thereby limiting the limit position of the rotation of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0028] Figure 1 is a front view schematic diagram of an embodiment of a rotating screen assembly provided by the present application;

[0029] Figure 2 is a three-dimensional schematic diagram of an embodiment of a rotating screen assembly provided by the present application;

[0030] Figure 3 yes Figure 1 and Figure 2 A three-dimensional schematic diagram of a rotation detection mechanism in a rotating screen assembly;

[0031] Figure 4 yes Figure 1 and Figure 2 A three-dimensional schematic diagram of a driving mechanism in a rotating screen assembly;

[0032] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the internal structure of the driving mechanism;

[0033] Figure 6 yes Figure 3 A three-dimensional schematic diagram of the internal structure of the rotation detection mechanism;

[0034] Figure 7 yes Figure 3 A schematic cross-sectional view of a detection portion of a rotation detection mechanism along a rotation axis R1;

[0035] Figure 8 yes Figure 7 The enlarged image in the middle dashed box;

[0036] Fig. 9 yes Figure 8 Schematic diagram of the structure of the magnet and magnetic sensitive element.

[0037] Description of reference numerals:

[0038] Display 100

[0039] Drive end 101

[0040] Driven end 102

[0041] Rotation detection mechanism 200

[0042] Detection part 201

[0043] Connecting frame part 202

[0044] First Laminating Section 2021

[0045] First fixing hole 2021a

[0046] First bending portion 2022

[0047] Magnet 2101

[0048] Magnetic sensor 2102

[0049] Gap 2103

[0050] Driven shaft 211

[0051] Driven end bearing 2110

[0052] First gear 212

[0053] Second gear 213

[0054] PCB board 214

[0055] Encoder fixing seat 215

[0056] First positioning sleeve 216

[0057] Second positioning sleeve 217

[0058] The third positioning sleeve 218

[0059] Positioning column 219

[0060] Fourth positioning sleeve 220

[0061] Driven end housing 221

[0062] Driven cover 222

[0063] Driven cover 223

[0064] The first damping friction plate group 281

[0065] The first damping fixing seat 282

[0066] First stop 291

[0067] First rotating piece 292

[0068] Driving mechanism 300

[0069] Driving part 301

[0070] Mounting frame portion 302

[0071] The second laminating part 3021

[0072] Second fixing hole 3021a

[0073] The second bending portion 3022

[0074] Drive shaft 3001

[0075] Drive end bearing 3002

[0076] Motor 310

[0077] Drive end housing 320

[0078] Driving Base 321

[0079] Drive cover 322

[0080] Shock absorber 323

[0081] Drive shaft 330

[0082] Worm 331

[0083] Worm gear 332

[0084] First stage pinion 333

[0085] First gear shaft 334

[0086] Second duplex tooth 341

[0087] Second gear shaft 342

[0088] The third duplex gear 351

[0089] The third gear shaft 352

[0090] Fourth duplex tooth 361

[0091] Fourth gear shaft 362

[0092] Fifth stage large gear 371

[0093] Second damping friction plate group 381

[0094] Second damping fixing seat 382

[0095] Second stop convex 391

[0096] Second rotating piece 392

[0097] Fixing member 400

[0098] Rotation axis R1

[0099] Center axis R 21

[0100] Center axis R 22

[0101] Center axis R 31

[0102] Center axis R 32 DETAILED DESCRIPTION

[0103] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0104] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0105] Now more and more cars are equipped with on-board motion screens, which are usually installed on the roof, allowing the co-pilot and rear passengers to enjoy the video and audio experience while driving. Due to the limited space inside the car, this type of display screen generally needs to be folded to a position parallel to the roof when not in use, and the actuator for the screen flipping requires a power drive system, and also has the function of stopping the screen at any position within a certain angle range.

[0106] The power drive systems of the existing car-mounted motion screens on the market all use a dual-motor solution, that is, a set of motors are arranged on each side of the display screen, and the driven shafts of the two sets of motors are connected and fixed to the display screen at the same time. When the motion screen needs to be opened or folded, the two motors work synchronously to drive the rotation of the motion screen together.

[0107] This drive system has several disadvantages. The first is that the dual motors have very high requirements for electronic control technology. It is difficult to achieve completely synchronous movement of the motors at both ends, which will cause unbalanced force on the rotation of the screen, and ultimately there will be problems such as noise, vibration and short life. The second is the cost requirements of the dual motor solution. Not only are the two motors themselves expensive, but the matching reduction gear mechanism also requires two sets of the same, which increases its cost. And due to the lack of a detection mechanism for the rotation angle of the display screen, it is difficult to control the rotation angle of the display screen.

[0108] In the embodiment of the present application, the driving end of the vehicle-mounted motion screen along its rotation axis is connected to a driving mechanism for driving the display screen to rotate. Therefore, the embodiment of the present application cancels the driving structure on one side of the bilateral driving structure, that is, only a unilateral driving structure is set, which solves the problem of unbalanced rotation force of the screen due to the asynchronous bilateral driving, thereby solving the problem of noise, vibration and short life caused by the unbalanced rotation of the display screen. At the same time, since the driving structure on one side is reduced, the cost is also reduced. At the same time, a rotation detection mechanism is set at the driven end of the vehicle-mounted motion screen along its rotation axis, and the rotation angle of the vehicle-mounted motion screen can be measured to ensure accurate control of the rotation position of the vehicle-mounted motion screen.

[0109] This application provides a rotating screen assembly, see Figure 1 and Figure 2 , Figure 1 is a front view schematic diagram of an embodiment of a rotating screen assembly provided by the present application, Figure 2 1 is a three-dimensional schematic diagram of an embodiment of a rotating screen assembly provided by the present application. In this embodiment, the rotating screen assembly includes a display screen 100, a driving mechanism 300 and a rotation detection mechanism 200. Exemplarily, the display screen 100 can be a vehicle-mounted motion screen or other rotatable screen with display function.

[0110] The display screen 100 can rotate along the rotation axis R1. In the direction of the rotation axis R1, the two ends of the display screen 100 are respectively a driving end 101 and a driven end 102. The driving mechanism 300 is connected to the driving end 101 and is used to drive the display screen 100 to rotate. The rotation detection mechanism 200 is connected to the driven end 102 and is used to detect the rotation angle of the display screen 100.

[0111] See also Figure 3 , Figure 3 yes Figure 1 and Figure 2 The rotation detection mechanism 200 includes a connecting frame part 202 and a detection part 201. The connecting frame part 202 includes a first bonding part 2021 and a first bending part 2022. Figure 1 and Figure 2The first bonding portion 2021 is used to bond and fix the display screen 100, the first bending portion 2022 is bent relative to the first bonding portion 2021 in a direction perpendicular to the rotation axis R1 in a direction away from the display screen 100, and the detection portion 201 is connected to the first bending portion 2022 so that the orthographic projection of the detection portion 201 on the display screen 100 at least partially overlaps with the display screen 100.

[0112] It can be seen that the rotating screen assembly provided by the present application is connected to the driving mechanism 300 and the rotating detection mechanism 200 at both ends of the display screen 100, so the driving mode of the display screen 100 of the present application is unilateral driving. Compared with the traditional bilateral driving mode, it solves the problem of unbalanced rotation force of the display screen 100 due to the asynchronous bilateral driving, thereby solving the problems of noise, vibration and short life caused by the unbalanced rotation force of the display screen 100. At the same time, the cost is also reduced due to the reduction of the driving structure on one side. At the same time, the rotating detection mechanism 200 is set at the driven end 102 of the display screen 100 along its rotation axis R1, and the rotation angle of the display screen 100 can be measured to ensure the precise control of the rotation position of the display screen 100. In addition, the rotation detection mechanism 200 includes a connecting frame part 202 and a detection part 201. The detection part 201 is connected to the display screen 100 through the connecting frame part 202. The orthographic projection of the detection part 201 on the display screen 100 at least partially overlaps with the display screen 100, which can reduce the axial dimension of the overall structure formed by the display screen 100 and the rotation detection mechanism 200, and further reduce the overall axial dimension of the rotating screen assembly of the present application.

[0113] The orthographic projection of the detection part 201 on the display screen 100 at least partially overlaps with the display screen 100, which means that the orthographic projection of the detection part 201 on the display screen 100 partially or completely overlaps with the display screen 100. Furthermore, the orthographic projection of the rotation detection mechanism 200 on the display screen 100 partially or completely overlaps with the display screen 100. In order to further reduce the axial size of the overall structure formed by the display screen 100 and the rotation detection mechanism 200, the portion of the rotation detection mechanism 200 located outside the display screen 100 in the direction of the rotation axis R1 can be reduced as much as possible. It is best that the orthographic projection of the rotation detection mechanism 200 on the display screen 100 completely overlaps with the display screen 100, so as to avoid the rotation detection mechanism 200 protruding from the display screen 100 in the direction of the rotation axis R1, that is, the axial size of the overall structure formed by the display screen 100 and the rotation detection mechanism 200 is the axial size of the display screen 100 itself.

[0114] See also Figure 4 , Figure 4 yes Figure 1 and Figure 2A three-dimensional schematic diagram of the driving mechanism in the rotating screen assembly. In this embodiment, the driving mechanism 300 includes a mounting frame portion 302 and a driving portion 301, the mounting frame portion 302 includes a second fitting portion 3021 and a second bending portion 3022, the second fitting portion 3021 is used to fit and fix the display screen 100, the second bending portion 3022 is bent in a direction perpendicular to the rotation axis R1 relative to the second fitting portion 3021 in a direction away from the display screen 100, and the driving portion 301 is connected to the second bending portion 3022, so that the orthographic projection of the driving portion 301 on the display screen 100 at least partially overlaps with the display screen 100. In this embodiment, the axial size of the overall structure formed by the display screen 100 and the driving mechanism 300 can be reduced, and the overall axial size of the rotating screen assembly of the present application can be further reduced.

[0115] The above-mentioned orthographic projection of the driving part 301 on the display screen 100 at least partially overlaps with the display screen 100 means that the orthographic projection of the driving part 301 on the display screen 100 partially or completely overlaps with the display screen 100, and further, the orthographic projection of the driving mechanism 300 on the display screen 100 partially or completely overlaps with the display screen 100. In order to further reduce the axial size of the overall structure formed by the display screen 100 and the rotating driving mechanism 300, the portion of the driving mechanism 300 located outside the display screen 100 in the direction of the rotation axis R1 can be reduced as much as possible. It is best that the orthographic projection of the driving mechanism 300 on the display screen 100 completely overlaps with the display screen 100, so as to avoid the driving mechanism 300 protruding from the display screen 100 in the direction of the rotation axis R1, that is, the axial size of the overall structure formed by the display screen 100 and the driving mechanism 300 is the axial size of the display screen 100 itself.

[0116] It should be noted that the display screen 100 usually includes a front side and a back side, the front side is the display surface, and the first bonding portion 2021 and the second bonding portion 3021 can be fixed on the back side of the display screen 100 to avoid affecting the display effect on the front side of the display screen 100. Of course, the situation in which the first bonding portion 2021 and the second bonding portion 3021 are fixed on the front side of the display screen 100 is not ruled out.

[0117] See again Figure 1 and Figure 2 In this embodiment, the driving mechanism 300 and the rotation detection mechanism 200 are located on the same side of the display screen 100 in a direction perpendicular to the rotation axis R1 , so the driving mechanism 300 and the rotation detection mechanism 200 can be hidden behind the display screen 100 .

[0118] See again Figure 3 and Figure 4In this embodiment, the first fitting part 2021 and the second fitting part 3021 are both provided with fixing holes, and fasteners are inserted through the fixing holes and connected to the display screen 100 to achieve the connection and fixation between the first fitting part 2021 and the display screen 100, and the connection and fixation between the second fitting part 3021 and the display screen 100. The fasteners can be screws or bolts. The fixing hole on the first fitting part 2021 is the first fixing hole 2021a, and the fixing hole on the second fitting part 3021 is the second fixing hole 3021a. In this embodiment, the connection and fixation between the first fitting part 2021 and the display screen 100, and the connection and fixation between the second fitting part 3021 and the display screen 100 are achieved by the fasteners and the fixing holes, and the connection method is simple and reliable. In other embodiments, the first fitting part 2021 and the second fitting part 3021 can also be fixed to the display screen 100 by other methods such as bonding or welding.

[0119] See also Figure 5 , Figure 5 yes Figure 4 A three-dimensional diagram of the internal structure of the driving mechanism. Figure 4 In this embodiment, the driving part 301 of the driving mechanism 300 includes a driving end housing 320, a driving shaft 3001, a motor 310 and a gear reduction mechanism. The driving end housing 320 is used to be fixedly connected to the fixed component 400. For example, the fixed component 400 can be a car chassis. The gear reduction mechanism is located in the driving end housing 320, the motor 310 is located outside the driving end housing 320, and the output shaft of the motor 310 extends into the driving end housing 320 and is connected to the power input end of the gear reduction mechanism. One end of the driving shaft 3001 extends into the driving end housing 320 and is connected to the power output end of the gear reduction mechanism, and the other end is fixedly connected to the second bending portion 3022, and the central axis R of the driving shaft 3001 is 31 In this embodiment, the output shaft of the motor 310 is decelerated by the gear reduction mechanism to drive the drive shaft 3001 to rotate, so that when the drive shaft 3001 rotates, the display screen 100 is driven to rotate through the mounting frame part 302 fixed to the drive shaft 3001 .

[0120] The drive end housing 320 can be connected to the fixed member 400 by fasteners such as bolts, and in order to reduce the vibration effect between the drive end housing 320 and the fixed member 400 when the motor 310 is working, a shock absorbing pad 323 is provided between the drive end housing 320 and the fixed member 400. In order to facilitate the installation of various parts in the drive end housing 320, the drive end housing 320 includes a detachable drive base 321 and a drive cover 322, and the drive base 321 and the drive cover 322 can be connected and installed by screws.

[0121] The gear reduction mechanism includes a first-stage reduction mechanism, a second-stage reduction mechanism, a third-stage reduction mechanism, a fourth-stage reduction mechanism and a fifth-stage reduction mechanism.

[0122] The first-stage reduction mechanism includes a worm 331 and a first double-toothed structure. The first double-toothed structure includes a worm wheel 332 and a first-stage pinion 333. The first double-toothed structure is rotatably connected to the driving end housing 320 (specifically, the driving base 321) through the first gear shaft 334. After the output shaft of the motor 310 penetrates the driving end housing 320, it is coaxially fixedly connected to the worm 331, and the first reduction is achieved through the meshing of the worm 331 and the worm wheel 332.

[0123] The second-stage reduction mechanism includes a second double-tooth 341, which includes a second-stage large gear and a second-stage small gear. The second double-tooth 341 is rotatably connected to the driving end housing 320 (specifically, the driving base 321) through the second gear shaft 342, and the first-stage small gear 333 of the first-stage reduction mechanism is meshed with the second-stage large gear of the second-stage reduction mechanism to achieve the second reduction.

[0124] The third-stage reduction mechanism includes a third double-tooth 351, which includes a third-stage large gear and a third-stage small gear. The third double-tooth 351 is rotatably connected to the driving end housing 320 (specifically, the driving base 321) through a third gear shaft 352. The second-stage small gear of the second-stage reduction mechanism is meshed with the third-stage large gear of the third-stage reduction mechanism to achieve the third reduction.

[0125] The fourth-stage reduction mechanism includes a fourth double-tooth 361, which includes a fourth-stage large gear and a fourth-stage small gear. The fourth double-tooth 361 is rotatably connected to the driving end housing 320 (specifically, the driving base 321) through a fourth gear shaft 362. The third-stage small gear of the third-stage reduction mechanism is meshed with the fourth-stage large gear of the fourth-stage reduction mechanism to achieve the fourth reduction.

[0126] The fifth-stage reduction mechanism includes a fifth-stage large gear 371, which is coaxially fixed on the drive shaft 3001. The fifth reduction is achieved through the engagement between the fourth-stage pinion of the fourth-stage reduction mechanism and the fifth-stage large gear 371 of the fifth-stage reduction mechanism, and finally the torque and speed are output by the drive shaft 3001.

[0127] In this embodiment, the speed output by the motor 310 is output to the drive shaft 3001 after five-stage reduction to achieve the required speed of the drive shaft 3001. In other embodiments, reduction mechanisms with other structures can also be used, but the reduction mechanism is at least a one-stage reduction mechanism.

[0128] A driving end bearing 3002 is sleeved on one end of the driving shaft 3001 away from the display screen 100 in the direction of the rotation axis R1. The driving end bearing 3002 is used to support the driving end housing 320. The driving end bearing 3002 may be an oil-containing bushing.

[0129] Combination Figure 1 and Figure 2 It can be seen that, since the space (especially the size along the rotation axis R1) of the fixing member 400 for installing the display screen 100, the driving mechanism 300 and the rotation detection mechanism 200 is limited, the motor 310 is arranged on the outer side of the driving shaft 3001 in a direction perpendicular to the rotation axis R1 in this embodiment, so that the central axis R1 of the output shaft of the motor 310 is 32 The gear reduction mechanism is perpendicular to the rotation axis R1 and is located between the drive shaft 3001 and the motor 310 in a direction perpendicular to the rotation axis R1 to reduce the size of the drive mechanism 300 in the direction of the rotation axis R1.

[0130] See also Figure 6 , Figure 6 yes Figure 3 A three-dimensional schematic diagram of the internal structure of the rotation detection mechanism, combined with Figure 3 and Figure 6 In this embodiment, the detection part 201 of the rotation detection mechanism 200 includes a driven end housing 221, a driven shaft 211, a magnet and a magnetic sensitive element.

[0131] The driven end housing 221 is used to be fixedly connected to the fixed member 400, and the driven end housing 221 can be fixedly connected to the fixed member 400 by fasteners such as bolts. In order to facilitate the installation of various parts in the driven end housing 221, the driven end housing 221 includes a detachably connected driven cover body 223 and a driven cover body 222. One end face of the driven cover body 222 is open, and the driven cover body 223 is covered at the opening to realize the disassembly and assembly of the driven end housing 221. In order to reduce the vibration effect between the driven end housing 221 and the fixed member 400, a shock-absorbing pad can also be set between the driving end housing 320 and the fixed member 400.

[0132] Combination Figure 7 and Figure 8 , Figure 7 yes Figure 3 A schematic cross-sectional view of the detection part of the rotation detection mechanism along the rotation axis R1, Figure 8 yes Figure 7 In the enlarged view in the dotted line frame, one end of the driven shaft 211 passes through the driven end housing 221 and is rotatably connected to the driven end housing 221, and the other end is fixedly connected to the first bending portion 2022, and the central axis R of the driven shaft 211 21The driven shaft 211 extends into the driven end housing 221 and is provided with a driven end bearing 2110. The driven shaft 211 is supported in the driven end housing 221 by the driven end bearing 2110. The driven end bearing 2110 may be an oil-containing bushing.

[0133] The magnet 2101 is located in the driven end housing 221. The magnet 2101 is connected to the driven shaft 211 to rotate with the rotation of the driven shaft 211. The magnet 2101 includes at least one pair of radially magnetized poles. The magnetic sensitive element 2102 is fixed in the driven end housing 221. The magnetic sensitive element 2102 is located at the central axis R of the magnet 2101. 22 On, the magnetic sensitive element 2102 is spaced apart from the magnet 2101.

[0134] In this embodiment, when the driving mechanism 300 drives the display screen 100 to rotate, the display screen 100 will drive the driven shaft 211 to rotate synchronously, and when the driven shaft 211 rotates, it will drive the magnet 2101 to rotate, so that when the magnet 2101 rotates, the rotation angle of the magnet 2101 is detected by the magnetic sensor 2102, and then the rotation angle of the driven shaft 211 and the display screen 100 can be obtained. The specific principle of detection is that the magnet 2101 is used to generate magnetic flux lines, and the magnetic sensor 2102 is used to detect the rotation position (i.e., rotation angle) of the magnet 2101 according to the magnetic flux lines. Since the magnet 2101 includes at least one pair of radially magnetized poles, and the magnetic sensor 2102 is located at the central axis R of the magnet 2101. 22 Therefore, when the magnet 2101 rotates, the magnetic sensor 2102 can respond to the change in the direction of the magnetic flux lines of the magnet 2101 to detect the rotation position of the magnet 2101, and the rotation of the magnet 2101 is driven by the rotation of the driven shaft 211, so the rotation position of the display screen 100 can be indirectly measured by measuring the rotation position of the magnet 2101. In this embodiment, the rotation position of the magnet 2101 can be detected by sensing the change in the direction of the magnetic flux lines of the magnet 2101 by the magnetic sensor 2102, and the detection result is more accurate.

[0135] See also Fig. 9 , Fig. 9 2 is a schematic diagram of the structure of magnet 2101 and magnetic sensor 2102. Magnet 2101 is in the shape of an oblate cylinder. Magnet 2101 is a magnet with a pair of radially magnetized poles. Magnetic sensor 2102 is preferably a magnetic induction chip (IC). For example, the MT6835 chip can be selected. The chip is an angle encoder chip based on anisotropic magnetoresistive (AMR) technology. Magnetic sensor 2102 can respond to changes in the direction of a magnetic field parallel to its surface. Therefore, when magnet 2101 rotates, magnetic sensor 2102 can detect the angular position of magnet 2101.

[0136] The diameter (Dmag) of magnet 2101 is 4-16mm, preferably 10mm; the thickness (Tmag) of magnet 2101 is 1-4mm, preferably 2.5mm; the driving magnetic field (Bpk) of magnet 2101 is 30-1000mT, wherein the driving magnetic field is parallel to the horizontal direction of the surface of magnetic sensitive element 2102, and is measured on the surface of magnetic sensitive element 2102; the rotation speed (RS) of magnet 2101 is maximum 120000RPM (revolutions per minute); the temperature coefficient (TCmag) of magnet 2101, NdFeB magnet is preferably -0.12% / ℃, and SmCo magnet is preferably -0.035% / ℃.

[0137] The gap (AG) 2103 between the magnet 2101 and the magnetic sensor 2102 is 1-3mm, preferably 1mm, and the maximum is 3mm. The gap 2103 should be as small as possible to obtain the best detection performance. When the gap 2103 is large, the magnetic field is weakened, thereby deteriorating the detection performance. The central axis of the magnet 2101 and the sensing center of the magnetic sensor 2102 should be aligned, and the eccentricity (DISP) of the two should not exceed 0.3mm. Avoid eccentricity as much as possible during installation. The deterioration of detection performance caused by larger eccentricity and larger gap 2103 is more obvious for magnets with smaller diameters.

[0138] Please continue to refer to 6 to Figure 8 In this embodiment, the detection part 201 of the rotation detection mechanism 200 further includes a first gear 212 and a second gear 213. The first gear 212 is located in the driven end housing 221 and is fixedly sleeved on the driven shaft 211. The second gear 213 is located in the driven end housing 221 and is coaxially fixedly connected to the magnet 2101. The second gear 213 is meshed with the outside of the first gear 212. The driven end housing 221 can surround the magnet 2101, the magnetic sensitive element 2102, the first gear 212 and the second gear 213 to prevent them from being exposed. In this embodiment, the driven shaft 211 drives the first gear 212 fixed on the driven shaft 211 to rotate synchronously when the display screen 100 rotates. The engagement of the first gear 212 and the second gear 213 drives the second gear 213 to rotate, thereby driving the magnet 2101 coaxially fixed with the second gear 213 to rotate. In this embodiment, the second gear 213, the magnet 2101, and the magnetic sensitive element 2102 are arranged on the radial outer side of the driven shaft 211, and the central axis R of the magnet 2101 is 22 Being parallel to the rotation axis R1 , the size of the rotation detection mechanism 200 itself on the rotation axis R1 can be reduced, thereby reducing the overall axial size of the rotating screen assembly of the present application.

[0139] In this embodiment, the second gear 213 directly meshes with the first gear 212 . In other embodiments, a plurality of intermediate gears may be meshed between the second gear 213 and the first gear 212 .

[0140] In this embodiment, the transmission ratio of the first gear 212 and the second gear 213 is 1, specifically, the diameters of the first gear 212 and the second gear 213 are the same. That is, the first gear 212 and the second gear 213 are in a ratio transmission, and the rotation speed of the second gear 213 is the rotation speed of the first gear 212, that is, the rotation angle of the magnet 2101 on the second gear 213 is measured, that is, the rotation angle of the driven shaft 211 and the display screen 100 is measured, and the detection process is simpler and more effective. In other embodiments, the first gear 212 and the second gear 213 can also adopt a non-ratio transmission, that is, the gear diameters of the first gear 212 and the second gear 213 can also be different, and the first gear 212 drives the second gear 213 to speed up or slow down when rotating, that is, when the display screen 100 rotates an angle, the corresponding rotation angle of the magnet 2101 is greater than or less than the rotation angle of the display screen 100, and the actual rotation angle of the display screen 100 needs to be converted according to the ratio of the gear diameters of the first gear 212 and the second gear 213.

[0141] Furthermore, in order to realize the installation and fixation of the magnetic sensitive element 2102 in the driven end housing 221, the rotation detection mechanism 200 of this embodiment further includes an encoder fixing seat 215, a first positioning sleeve 216 and a PCB board 214. The first positioning sleeve 216 is fixed to the inner wall of the driven end housing 221. Specifically, the first positioning sleeve 216 is fixed to the inner wall of the cover body 223. The encoder fixing seat 215 is fixed to the first positioning sleeve 216 and defines a cavity together with the first positioning sleeve 216. The PCB board 214 is positioned in the cavity and fixed to the encoder fixing seat 215. The encoder fixing seat 215 is provided with a through hole. The magnetic sensitive element 2102 is fixed to the PCB board 214, exposed to the through hole and opposite to the magnet 2101 to sense the magnetic flux lines generated by the magnet 2101. Since the magnetic sensing element 2102 is usually pre-installed on the PCB board 214 , the magnetic sensing element 2102 is positioned in the driven end housing 221 after the PCB board 214 is positioned in the first positioning sleeve 216 .

[0142] To facilitate positioning of the magnet 2101 on the second gear 213 , in this embodiment, a second positioning sleeve 217 is provided on the end surface of the second gear 213 facing the magnetic sensitive element 2102 , and the magnet 2101 is positioned in the second positioning sleeve 217 .

[0143] In order to facilitate the installation of the second gear 213 in the driven end housing 221, the encoder fixing seat 215 is provided with a third positioning sleeve 218 at the above-mentioned through hole, the magnetic sensitive element 2102 is located on the central axis of the third positioning sleeve 218, and the second positioning sleeve 217 is coaxially sleeved with the third positioning sleeve 218. A fourth positioning sleeve 220 is also provided in the driven end housing 221. Specifically, the fourth positioning sleeve 220 is fixed to the inner wall of the cover body 222. The end surface of the second gear 213 facing away from the first positioning sleeve 216 is coaxially fixedly connected with a positioning column 219. The positioning column 219 is positioned on the fourth positioning sleeve 220 and can rotate relative to the fourth positioning sleeve 220. Therefore, the second gear 213 supports both ends of the second gear 213 through the rotational cooperation of the second positioning sleeve 217 and the third positioning sleeve 218 on one side of the axial direction and the rotational cooperation of the positioning column 219 and the fourth positioning sleeve 220 on the other side, thereby realizing the rotation of the second gear 213 relative to the driven end housing 221. At the same time, after the PCB board 214 is installed in the first positioning sleeve 216, the magnetic sensitive element 2102 is exactly located on the central axis of the third positioning sleeve 218, and after the magnet 2101 is installed in the second positioning sleeve 217, the magnet 2101 is exactly located on the central axis of the second positioning sleeve 217, and the second positioning sleeve 217 and the third positioning sleeve 218 are coaxially sleeved, so when the second positioning sleeve 217 and the third positioning sleeve 218 are coaxially sleeved, the central axis of the magnetic sensitive element 2102 and the magnet 2101 are automatically aligned.

[0144] See again Figure 3 and Figure 4 In this embodiment, the rotation detection mechanism 200 further includes a first damping component, which is used to achieve damped rotation of the driven shaft 211 relative to the driven end housing 221; and / or the driving mechanism 300 further includes a second damping component, which is used to achieve damped rotation of the driving shaft 3001 relative to the driving end housing 320. In this embodiment, the first damping component and the second damping component can provide a buffering and fixing effect when the motion display screen 100 is flipped, and the display screen 100 can be suspended at any position.

[0145] Specifically, the first damping assembly includes a first damping friction plate group 281 and a first damping fixed seat 282, the first damping fixed seat 282 is used to be fixedly connected to the driven end housing 221, the first damping friction plate group 281 includes at least one first fixed friction plate and at least one first rotating friction plate that are frictionally connected, the first fixed friction plate and the first rotating friction plate are both coaxially sleeved on the driven shaft 211, the first fixed friction plate is fixed to the first damping fixed seat 282, and the first rotating friction plate is fixed to the driven shaft 211, so that the first rotating friction plate rotates relative to the first fixed friction plate when the driven shaft 211 rotates.

[0146] The second damping assembly includes a second damping friction plate group 381 and a second damping fixed seat 382, ​​the second damping fixed seat 382 is used to be fixedly connected to the driving end housing 320, the second damping friction plate group 381 includes at least one second fixed friction plate and at least one second rotating friction plate that are frictionally connected, the second fixed friction plate and the second rotating friction plate are both coaxially sleeved on the driving shaft 3001, the second fixed friction plate is fixed to the second damping fixed seat 382, ​​and the second rotating friction plate is fixed to the driving shaft 3001, so that the second rotating friction plate rotates relative to the second fixed friction plate when the driving shaft 3001 rotates.

[0147] In this embodiment, the first damping assembly and the second damping assembly are in the form of friction plate groups. In other embodiments, they include but are not limited to liquid dampers, gas dampers, etc.

[0148] See again Figure 3 and Figure 4 In this embodiment, the rotation detection mechanism 200 also includes a first rotation limiting mechanism, which includes a first stop protrusion 291 and a first rotating plate 292. The first stop protrusion 291 is fixed to the first damping fixing seat 282, and the first rotating plate 292 is fixed to the first bending portion 2022, so that the first rotating plate 292 can be blocked by the first stop protrusion 291 when it rotates to the extreme position along with the driven shaft 211.

[0149] The driving mechanism 300 also includes a second rotation limiting mechanism, which includes a second stop protrusion 391 and a second rotating plate 392. The second stop protrusion 391 is fixed to the second damping fixing seat 382, ​​and the second rotating plate 392 is fixed to the second bending portion 3022 so that the second rotating plate 392 can be blocked by the second stop protrusion 391 when it rotates to the extreme position along with the driving shaft 3001.

[0150] In this embodiment, the first rotating piece 292 can be blocked by the first stop protrusion 291 when it rotates to the extreme position along with the driven shaft 211, and the second rotating piece 392 can be blocked by the second stop protrusion 391 when it rotates to the extreme position along with the driving shaft 3001, thereby limiting the extreme position of the rotation of the display screen 100.

[0151] The terms "first", "second", "third" in this application are only used for descriptive purposes and cannot be understood as indicating the quantity of the indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of these features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative positional relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions. The process, method, system, product or equipment such as including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0152] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A rotating screen assembly, characterized in that: include: A display screen, wherein the display screen can rotate along a rotation axis, and in the direction of the rotation axis, two ends of the display screen are respectively a driving end and a driven end; A driving mechanism connected to the driving end, the driving mechanism being used to drive the display screen to rotate; A rotation detection mechanism is connected to the driven end, and is used to detect the rotation angle of the display screen. The rotation detection mechanism includes a connecting frame part and a detection part. The connecting frame part includes a first fitting part and a first bending part. The first fitting part is used to fit and fix the display screen. The first bending part is bent relative to the first fitting part in a direction perpendicular to the rotation axis in a direction away from the display screen. The detection part is connected to the first bending part so that the orthographic projection of the detection part on the display screen at least partially overlaps with the display screen.

2. The rotating screen assembly according to claim 1, characterized in that: The driving mechanism includes a mounting frame part and a driving part, the mounting frame part includes a second fitting portion and a second bending portion, the second fitting portion is used to fit and fix the display screen, the second bending portion is bent in a direction perpendicular to the rotation axis relative to the second fitting portion in a direction away from the display screen, and the driving part is connected to the second bending portion so that the orthographic projection of the driving part on the display screen at least partially overlaps with the display screen.

3. The rotating screen assembly according to claim 1 or 2, characterized in that: The driving mechanism and the rotation detection mechanism are located on the same side of the display screen in a direction perpendicular to the rotation axis.

4. The rotating screen assembly according to claim 2, characterized in that: The first fitting portion and the second fitting portion are both provided with fixing holes, and fasteners are passed through the fixing holes and connected to the display screen to achieve connection and fixation between the first fitting portion and the display screen, and connection and fixation between the second fitting portion and the display screen.

5. The rotating screen assembly according to claim 2, characterized in that: The driving part of the driving mechanism includes a driving end housing, a driving shaft, a motor and a gear reduction mechanism; The driving end housing is used to be fixedly connected to the fixed member; The gear reduction mechanism is located in the driving end housing; The motor is located outside the driving end housing, and the output shaft of the motor extends into the driving end housing and is connected to the power input end of the gear reduction mechanism; One end of the drive shaft extends into the drive end housing and is connected to the power output end of the gear reduction mechanism, and the other end is fixedly connected to the second bending portion, and the central axis of the drive shaft coincides with the rotation axis.

6. The rotating screen assembly according to claim 5, characterized in that: The detection part of the rotation detection mechanism includes a driven end housing, a driven shaft, a magnet and a magnetic sensitive element; The driven end housing is used to be fixedly connected to the fixed member; One end of the driven shaft extends into the driven end housing and is rotatably connected to the driven end housing, and the other end is fixedly connected to the first bending portion, and the central axis of the driven shaft coincides with the rotation axis; The magnet is located in the driven end housing, the magnet is connected to the driven shaft so as to rotate with the rotation of the driven shaft, and the magnet includes at least one pair of radially magnetized poles; The magnetic sensitive element is fixed in the driven end housing, the magnetic sensitive element is located on the central axis of the magnet, and the magnetic sensitive element is spaced apart from the magnet.

7. The rotating screen assembly according to claim 6, characterized in that: The rotation detection mechanism also includes a first gear and a second gear; The first gear is located in the driven end housing and is fixedly sleeved on the driven shaft; The second gear is located in the driven end housing and is coaxially fixedly connected to the magnet, and the second gear is meshed with the outer side of the first gear.

8. The rotating screen assembly according to claim 6, characterized in that: The rotation detection mechanism further comprises a first damping assembly, wherein the first damping assembly is used to realize damped rotation of the driven shaft relative to the driven end housing; And / or, the driving mechanism further includes a second damping assembly, wherein the second damping assembly is used to achieve damped rotation of the driving shaft relative to the driving end housing.

9. The rotating screen assembly according to claim 8, characterized in that: The first damping assembly includes a first damping friction plate group and a first damping fixed seat, the first damping fixed seat is used to be fixedly connected to the driven end housing, the first damping friction plate group includes at least one first fixed friction plate and at least one first rotating friction plate that are frictionally connected, the first fixed friction plate and the first rotating friction plate are both coaxially sleeved on the driven shaft, the first fixed friction plate is fixed to the first damping fixed seat, and the first rotating friction plate is fixed to the driven shaft, so that the first rotating friction plate rotates relative to the first fixed friction plate when the driven shaft rotates; And / or, the second damping assembly includes a second damping friction plate group and a second damping fixed seat, the second damping fixed seat is used to be fixedly connected to the driving end housing, the second damping friction plate group includes at least one second fixed friction plate and at least one second rotating friction plate that are frictionally connected, the second fixed friction plate and the second rotating friction plate are both coaxially sleeved on the driving shaft, the second fixed friction plate is fixed to the second damping fixed seat, and the second rotating friction plate is fixed to the driving shaft, so that the second rotating friction plate rotates relative to the second fixed friction plate when the driving shaft rotates.

10. The rotating screen assembly according to claim 8, characterized in that: The rotation detection mechanism further includes a first rotation limiting mechanism, the first rotation limiting mechanism including a first stop convex and a first rotating piece, the first stop convex being fixed to the first damping fixing seat, the first rotating piece being fixed to the first bending portion, so that the first rotating piece can be blocked by the first stop convex when the first rotating piece rotates to the limit position along with the driven shaft; And / or, the driving mechanism also includes a second rotation limiting mechanism, the second rotation limiting mechanism includes a second stop protrusion and a second rotating plate, the second stop protrusion is fixed to the second damping fixing seat, and the second rotating plate is fixed to the second bending portion, so that the second rotating plate can be blocked by the second stop protrusion when the second rotating plate rotates to the extreme position along with the driving shaft.

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