Intelligent upper limb rehabilitation equipment based on shoulder joint rehabilitation

Abstract

The utility model relates to the technical field of medical instruments, and discloses an upper limb intelligent rehabilitation device based on shoulder joint rehabilitation, which comprises a driving assembly, a shoulder joint rehabilitation device, a shoulder joint rehabilitation device and a shoulder joint rehabilitation device, and is characterized in that the driving assembly comprises a permanent magnet motor and a control module; the lifting support is arranged at the bottom of the driving assembly; the training assembly is connected with an output shaft of the permanent magnet motor through a connecting assembly and comprises a surrounding training part, an abduction training part and a lifting training part. According to the shoulder joint rehabilitation training device, surrounding training, abduction training and lifting training are combined, rehabilitation training can be comprehensively conducted on shoulder joints of a user, and the rehabilitation effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an intelligent upper limb rehabilitation device based on shoulder joint rehabilitation. Background Technology

[0002] With an aging population and an increase in various diseases, the incidence of joint injuries and diseases is rising year by year, causing great distress and inconvenience to patients. Traditional rehabilitation training methods usually require patients to go to hospitals or rehabilitation centers, where professional medical staff perform a series of tedious and repetitive movements. This approach is not only time-consuming and laborious, but also subject to numerous limitations in terms of hospital or rehabilitation center space, the number of professional personnel, and time scheduling, preventing many patients from receiving timely and effective rehabilitation training. Therefore, developing an intelligent device that can assist patients in joint rehabilitation training has significant practical significance and application value.

[0003] Joint rehabilitation training is crucial for the treatment of joint injuries and diseases. Through scientific training, it improves joint flexibility and range of motion, enhances motor control of damaged joints, and ultimately improves patients' quality of life. However, existing rehabilitation equipment often focuses on mechanical structural innovation. While this achieves some degree of passive joint training, it often neglects individual patient differences, making personalized and precise rehabilitation training difficult. Furthermore, these devices often lack intelligent feedback and assessment mechanisms during training, failing to adjust training plans based on the patient's real-time condition, resulting in limited training effectiveness.

[0004] In recent years, with the rapid development of technology, especially the continuous innovation of virtual reality (VR), artificial intelligence (AI), and motion sensor technologies, joint rehabilitation training software has gradually emerged and become a research hotspot in the field of rehabilitation. This software can provide a more engaging and interactive rehabilitation training experience by simulating real-world scenarios, and can monitor the patient's movement status and rehabilitation progress in real time.

[0005] Therefore, developing an intelligent rehabilitation device based on joint rehabilitation training software is of great significance for improving the effectiveness of rehabilitation training, reducing rehabilitation costs, and improving patients' quality of life. Utility Model Content

[0006] The purpose of this invention is to provide an intelligent upper limb rehabilitation device based on shoulder joint rehabilitation, aiming to solve the above-mentioned problems.

[0007] This utility model provides an intelligent upper limb rehabilitation device based on shoulder joint rehabilitation, comprising:

[0008] A drive assembly includes a driver and a control module. The driver includes a permanent magnet motor, and the control module is connected to the permanent magnet motor and is used to control the operating state of the permanent magnet motor.

[0009] A lifting bracket is disposed at the bottom of the drive assembly, and the lifting bracket is fixedly connected to the drive assembly;

[0010] The training component is connected to the output shaft of the permanent magnet motor via a connecting component. The training component includes a circumferential training section, an abduction training section, and an elevation training section. The circumferential training section is used to perform circumferential training on the user's shoulder joint, the abduction training section is used to perform abduction training on the user's shoulder joint, and the elevation training section is used to perform elevation training on the user's shoulder joint.

[0011] Preferably, the lifting bracket includes a fixed base, a lifting column, and a base. One end of the lifting column is fixedly connected to the top of the fixed base, and the other end of the lifting column is fixedly connected to the bottom of the base. The lifting column is used to adjust the height of the drive assembly.

[0012] Preferably, the connecting assembly includes a first connecting plate and a second connecting plate. One end of the first connecting plate is fixedly connected to the output shaft of the permanent magnet motor, and the other end of the first connecting plate is provided with a first mounting groove. The first connecting plate and the second connecting plate are detachably connected, and the second connecting plate is provided with a second mounting groove.

[0013] Preferably, the surrounding training section includes a U-shaped plate and a grip, with both sides of the grip fixedly connected to the U-shaped plate, and the U-shaped plate mounted on the first mounting groove; the grip is perpendicular to the first connecting plate.

[0014] Preferably, the abduction training section includes a first arc-shaped plate and a first locking member. The first arc-shaped plate is mounted on the second mounting groove through the first locking member. Fixing grooves are provided on both sides of the first arc-shaped plate. The fixing grooves are used for the fixing strap to pass through and fix the user's training part.

[0015] The extension direction of the length of the first arc-shaped plate is parallel to that of the first connecting plate.

[0016] Preferably, the lifting training part includes a third connecting plate, a second arc-shaped plate, and a second locking member. The third connecting plate is detachably connected to the first connecting plate. A third mounting groove is provided on the third connecting plate. The second arc-shaped plate is mounted on the third mounting groove through the second locking member. Fixing grooves are provided on both sides of the second arc-shaped plate.

[0017] The extension direction of the second arc-shaped plate is perpendicular to the first connecting plate.

[0018] Compared with the prior art, the beneficial effects of this utility model are that the rehabilitation equipment of this utility model is composed of multiple parts. Through reasonable design and layout, the assembly and adjustment process can be greatly simplified, making it easy for non-professional technicians to operate, thus improving the ease of use and convenience of the equipment.

[0019] The rehabilitation equipment of this invention can adaptively adjust according to the patient's real-time condition, such as training angle and training intensity, thereby providing a more scientific and effective rehabilitation training plan and improving rehabilitation results.

[0020] The rehabilitation equipment of this invention provides safe and effective passive rehabilitation training within the set / measured training angle and intensity range. At the same time, the equipment is also equipped with a variety of safety protection measures, such as emergency stop, to maximize the safety of patients during the training process and avoid possible injuries. Attached Figure Description

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

[0022] Figure 1 This is one of the structural schematic diagrams of the upper limb intelligent rehabilitation device based on shoulder joint rehabilitation in this utility model embodiment;

[0023] Figure 2 This is the second structural schematic diagram of the intelligent upper limb rehabilitation device based on shoulder joint rehabilitation in this utility model embodiment;

[0024] Figure 3 This is a schematic diagram of the structure of the rehabilitation device during circumferential training in an embodiment of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the rehabilitation equipment during abduction training in an embodiment of this utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the rehabilitation equipment during the lifting training in this embodiment of the utility model;

[0027] Figure 6 This is a schematic diagram of the connecting component in an embodiment of this utility model.

[0028] In the diagram, 1 is the drive assembly; 11 is the permanent magnet motor; 2 is the lifting bracket; 21 is the fixed base; 22 is the lifting column; 23 is the base; 3 is the surround training section; 31 is the U-shaped plate; 32 is the handle; 4 is the abduction training section; 41 is the first arc plate; 42 is the first locking element; 43 is the fixing groove; 5 is the lifting training section; 51 is the third connecting plate; 52 is the second arc plate; 53 is the second locking element; 54 is the third mounting groove; 6 is the connecting assembly; 61 is the first connecting plate; 62 is the first mounting groove; 63 is the second connecting plate; 64 is the second mounting groove. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0030] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] like Figures 1-6As shown, this utility model provides an intelligent upper limb rehabilitation device based on shoulder joint rehabilitation, including: a drive component 1, including a driver and a control module, the driver including a permanent magnet motor 11, the control module being connected to the permanent magnet motor 11, and the control module being used to control the operating state of the permanent magnet motor 11.

[0034] The lifting bracket 2 is located at the bottom of the drive assembly 1 and is fixedly connected to the drive assembly 1.

[0035] The training component is connected to the output shaft of the permanent magnet motor 11 via the connecting component 6. The training component includes a circumferential training unit 3, an abduction training unit 4, and an elevation training unit 5. The circumferential training unit 3 is used for circumferential training of the user's shoulder joint, the abduction training unit 4 is used for abduction training of the user's shoulder joint, and the elevation training unit 5 is used for elevation training of the user's shoulder joint. Each training unit is used independently, and the corresponding training unit is selected and installed according to the type of training required by the patient.

[0036] The control module includes a receiving unit, an acquisition unit, a processing unit, and a control unit. The receiving unit is used to receive training instructions from the user, the acquisition unit is used to acquire the operating data of the permanent magnet motor 11, the processing unit is used to set the operating instructions of the permanent magnet motor 11 according to the operating data, and the control unit is used to control the permanent magnet motor 11 according to the training instructions and the operating instructions.

[0037] This invention, by combining circumduction, abduction, and elevation training, provides comprehensive rehabilitation training for the user's shoulder joint, improving rehabilitation outcomes. Simultaneously, utilizing a permanent magnet motor 11 as a power source, combined with precise control by the control module, enables accurate driving of the training components, making the training process smoother and safer. Furthermore, the receiving unit receives the user's training commands, the acquisition unit collects the operating data of the permanent magnet motor 11, the processing unit sets the operating commands for the permanent magnet motor 11 based on the operating data, and the control unit controls the permanent magnet motor 11 according to the training and operating commands, forming a closed-loop control system. This system can adjust the movement state of the training components in real time to meet the personalized rehabilitation needs of different users.

[0038] In this embodiment, the permanent magnet motor 11 is a permanent magnet brushless synchronous motor, which includes a stator and a rotor. The stator includes a stator core and stator windings arranged along the inner circumferential surface of the stator core. The rotor includes a rotor core and a plurality of permanent magnets arranged along the outer circumferential surface of the rotor core.

[0039] Multiple stator teeth are arranged circumferentially on the inner circumferential surface of the stator core. The stator winding is wound on the multiple stator teeth and stator slots are defined between two adjacent stator teeth. The least common multiple of the total number of stator slots and the total number of permanent magnets is greater than or equal to 1000.

[0040] The extension direction of the stator slots forms an angle with the extension direction of the stator central axis, with the angle being greater than or equal to 6° and less than or equal to 9°. The stator windings adopt fractional concentrated windings.

[0041] Quick replacement of training components is not limited to bolts, pins, springs, clips, and other quick-release methods.

[0042] In some embodiments of this application, the lifting bracket 2 includes a fixed base 21, a lifting column 22 and a base 23. One end of the lifting column 22 is fixedly connected to the top of the fixed base 21, and the other end of the lifting column 22 is fixedly connected to the bottom of the base 23. The lifting column 22 is used to adjust the height of the drive assembly 1.

[0043] Understandably, the design of the lifting support 2 allows for flexible height adjustment of the entire rehabilitation equipment to accommodate different heights and usage scenarios. This height adjustability not only improves the equipment's applicability but also ensures user comfort and training effectiveness during the training process. Furthermore, the stable connection between the fixed base 21, the lifting column 22, and the base 23 guarantees the stability and safety of the equipment during training, avoiding potential training risks caused by equipment shaking or instability.

[0044] In some embodiments of this application, the connecting component 6 includes a first connecting plate 61 and a second connecting plate 63. One end of the first connecting plate 61 is fixedly connected to the output shaft of the permanent magnet motor 11, and the other end of the first connecting plate 61 is provided with a first mounting groove 62. The first connecting plate 61 and the second connecting plate 63 are detachably connected, and the second connecting plate 63 is provided with a second mounting groove 64.

[0045] Understandably, the detachable design of the connecting component 6 allows for easy connection and disassembly of the output shaft of the permanent magnet motor 11 with other parts of the rehabilitation equipment, thus facilitating equipment assembly and maintenance. The mounting slots on the first connecting plate 61 and the second connecting plate 63 not only provide flexible connection methods but also ensure the robustness and stability of the connection.

[0046] like Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of the rehabilitation device during circumferential training in an embodiment of this utility model. In some embodiments of this application, the circumferential training part 3 includes a U-shaped plate 31 and a handle 32. The two sides of the handle 32 are fixedly connected to the U-shaped plate 31, and the U-shaped plate 31 is installed on the first mounting groove 62. The handle 32 is perpendicular to the first connecting plate 61.

[0047] Understandably, the design of the U-shaped plate 31 and grip 32 surrounding the training unit 3 allows users to achieve more comprehensive and effective training results during shoulder joint rehabilitation exercises. The perpendicular design of the grip 32 to the first connecting plate 61 allows users to hold the grip 32 more naturally and comfortably during training, thereby improving training comfort and efficiency. The detachable design of the U-shaped plate 31 on the first mounting slot 62 not only facilitates installation and removal as needed but also makes cleaning and maintenance of the equipment easier.

[0048] like Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of the rehabilitation device during abduction training in an embodiment of this utility model. In some embodiments of this application, the abduction training section 4 includes a first arc-shaped plate 41 and a first locking member 42. The first arc-shaped plate 41 is mounted on a second mounting groove 64 via the first locking member 42. Fixing grooves 43 are provided on both sides of the first arc-shaped plate 41. The fixing grooves 43 are used for the fixing strap to pass through and fix the user's training part. The extension direction of the length of the first arc-shaped plate 41 is parallel to the first connecting plate 61.

[0049] Understandably, through the design of the first arc-shaped plate 41 and the first locking member 42 in the abduction training section 4, users can obtain stable support and effective training results when performing shoulder joint abduction rehabilitation training. The fixing grooves 43 on both sides of the first arc-shaped plate 41 allow the fixing strap to firmly fix the user's training area, thereby improving the stability and safety of the training. The design that the extension direction of the first arc-shaped plate 41 is parallel to that of the first connecting plate 61 ensures that the user can maintain the correct posture during training, avoid unnecessary injury, and also improve the targeting and effectiveness of the training.

[0050] like Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of the rehabilitation equipment during lifting training in an embodiment of this utility model. In some embodiments of this application, the lifting training part 5 includes a third connecting plate 51, a second arc-shaped plate 52, and a second locking member 53. The third connecting plate 51 is detachably connected to the first connecting plate 61. A third mounting groove 54 is provided on the third connecting plate 51. The second arc-shaped plate 52 is mounted on the third mounting groove 54 through the second locking member 53. Fixing grooves 43 are provided on both sides of the second arc-shaped plate 52. The extension direction of the length of the second arc-shaped plate 52 is perpendicular to the first connecting plate 61.

[0051] Understandably, the design of the third connecting plate 51, the second arc-shaped plate 52, and the second locking element 53 in the shoulder elevation training unit 5 allows users to obtain more flexible and diverse training methods when performing shoulder elevation rehabilitation training. The third connecting plate 51 is detachably connected to the first connecting plate 61, allowing the elevation training unit 5 to be flexibly installed and adjusted according to the user's training needs. The fixing grooves 43 on both sides of the second arc-shaped plate 52 also allow the fixing strap to firmly fix the user's training area, improving the stability and safety of the training. The design that the extension direction of the second arc-shaped plate 52 is perpendicular to the first connecting plate 61 allows the user to perform specialized training for shoulder elevation movements during training, thereby further improving the targeting and effectiveness of the training.

[0052] In some embodiments of this application, when the receiving unit receives a user's training instruction, the training instruction includes a training mode and training parameters; the training mode includes a surround training mode, an abduction training mode, and an upward training mode; the training parameters include a training angle, a training intensity, a training cycle, and a training duration.

[0053] Understandably, by receiving training commands from the user through the receiving unit, the device can intelligently select training modes and set training parameters according to the user's personalized needs. The circumduction, abduction, and elevation training modes cover the main movements of shoulder joint rehabilitation, meeting the rehabilitation training needs at different stages. Precise settings of parameters such as training angle, intensity, cycle, and duration ensure the targeted and effective nature of the training.

[0054] In some embodiments of this application, the acquisition unit includes a torque sensor and an angle sensor. The torque sensor is used to acquire the torque value of the permanent magnet motor; the angle sensor is used to acquire the angle value of the permanent magnet motor; the operating data includes the torque value and the angle value.

[0055] Understandably, by acquiring torque and angle sensors in the data acquisition unit, the equipment can obtain the torque and angle values ​​of the permanent magnet motor in real time and accurately, thereby gaining a comprehensive and detailed understanding of the equipment's operating status. Torque and angle values, as crucial components of operational data, are of great significance for evaluating training effectiveness, monitoring equipment status, and optimizing training programs.

[0056] In some embodiments of this application, the processing unit sets the operating instructions of the permanent magnet motor based on the operating data, including: determining the user's actual training intensity based on the torque value, comparing the actual training intensity with the training intensity, and comparing the angle value with the training angle, and determining the operating instructions of the permanent magnet motor based on the comparison results; if the actual training intensity is not equal to the training intensity, and / or the angle value is not equal to the training angle, then the operating instructions of the permanent magnet motor are set to stop operating instructions; otherwise, the operating instructions of the permanent magnet motor are set to continue operating instructions.

[0057] Understandably, the processing unit can intelligently set the operating commands of the permanent magnet motor based on the collected operational data, namely torque and angle values. By comparing the actual training intensity with the preset training intensity, and the actual angle value with the preset training angle, the processing unit can accurately determine whether the user's training status meets expectations. Once it detects that the actual training intensity or angle value does not match the preset value, the processing unit will immediately issue a stop command to ensure user safety and avoid unnecessary injury. This intelligent control method not only improves the flexibility and adaptability of the equipment but also greatly enhances the user experience and rehabilitation effect.

[0058] In some embodiments of this application, the control unit controls the permanent magnet motor according to training instructions and running instructions, including: after controlling the permanent magnet motor according to training instructions, the control unit receives running instructions; if the running instructions are stop running instructions, the permanent magnet motor is stopped immediately; if the running instructions are continue running instructions, the permanent magnet motor is controlled according to training instructions.

[0059] Understandably, the control unit can efficiently respond to the operating commands issued by the processing unit and precisely control the permanent magnet motor. When it receives a stop command, the control unit can quickly cut off the power to the permanent magnet motor, ensuring that the equipment stops operating immediately, thus effectively preventing potential user injury caused by continuous operation. When it receives a continue command, the control unit can adjust the operating state of the permanent magnet motor according to preset training instructions to meet the user's current training needs.

[0060] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program goods. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program goods embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0061] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program goods according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0062] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0063] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. An intelligent upper limb rehabilitation device based on shoulder joint rehabilitation, characterized in that, include: A drive assembly includes a driver and a control module. The driver includes a permanent magnet motor, and the control module is connected to the permanent magnet motor and is used to control the operating state of the permanent magnet motor. A lifting bracket is disposed at the bottom of the drive assembly, and the lifting bracket is fixedly connected to the drive assembly; The training component is connected to the output shaft of the permanent magnet motor via a connecting component. The training component includes a circumferential training section, an abduction training section, and an elevation training section. The circumferential training section is used to perform circumferential training on the user's shoulder joint, the abduction training section is used to perform abduction training on the user's shoulder joint, and the elevation training section is used to perform elevation training on the user's shoulder joint.

2. The intelligent upper limb rehabilitation device based on shoulder joint rehabilitation according to claim 1, characterized in that, The lifting bracket includes a fixed base, a lifting column, and a base. One end of the lifting column is fixedly connected to the top of the fixed base, and the other end of the lifting column is fixedly connected to the bottom of the base. The lifting column is used to adjust the height of the drive assembly.

3. The intelligent upper limb rehabilitation device based on shoulder joint rehabilitation according to claim 1, characterized in that, The connecting assembly includes a first connecting plate and a second connecting plate. One end of the first connecting plate is fixedly connected to the output shaft of the permanent magnet motor, and the other end of the first connecting plate is provided with a first mounting groove. The first connecting plate and the second connecting plate are detachably connected, and the second connecting plate is provided with a second mounting groove.

4. The intelligent upper limb rehabilitation device based on shoulder joint rehabilitation according to claim 3, characterized in that, The surrounding training section includes a U-shaped plate and a grip. The two sides of the grip are fixedly connected to the U-shaped plate, and the U-shaped plate is installed on the first mounting groove. The grip is perpendicular to the first connecting plate.

5. The intelligent upper limb rehabilitation device based on shoulder joint rehabilitation according to claim 4, characterized in that, The abduction training section includes a first arc-shaped plate and a first locking member. The first arc-shaped plate is installed on the second mounting groove through the first locking member. Fixing grooves are provided on both sides of the first arc-shaped plate. The fixing grooves are used for the fixing strap to pass through and fix the user's training part. The extension direction of the length of the first arc-shaped plate is parallel to that of the first connecting plate.

6. The intelligent upper limb rehabilitation device based on shoulder joint rehabilitation according to claim 5, characterized in that, The lifting training section includes a third connecting plate, a second arc-shaped plate, and a second locking member. The third connecting plate is detachably connected to the first connecting plate. A third mounting groove is provided on the third connecting plate. The second arc-shaped plate is mounted on the third mounting groove through the second locking member. Fixing grooves are provided on both sides of the second arc-shaped plate. The extension direction of the second arc-shaped plate is perpendicular to the first connecting plate.

Images