Rehabilitation training device for finger joint nursing

Abstract

The invention provides a rehabilitation training device for finger joint nursing, and belongs to the technical field of finger joint rehabilitation equipment. Comprising a carrier serving as a mounting base, the carrier can be worn on the palm of a patient, a control system is arranged on the carrier, a plurality of finger joint connecting parts are connected to the carrier, each finger joint connecting part comprises a plurality of hinged movable shells, one side, close to the palm, of each movable shell is provided with an opening, and an air bag is arranged on the movable shell and located on the outer side of the opening; the air bag is externally connected with a pump air source through a carrier. The device controls all the movable shells to act in sequence or synchronously according to a program setting sequence to perform rehabilitation training on the palm and finger joints of a patient, and can also intermittently inflate air into the air bags during training, so that the air bags are expanded and press the finger pulp positions of the fingers of the patient, the perception of the patient on the fingers in the finger bending and stretching process is enhanced, and the rehabilitation training effect is improved. The device has the advantage of improving the rehabilitation training effect.

Description

Technical Field

[0001] The invention relates to the technical field of finger joint rehabilitation equipment, and in particular to a rehabilitation training device for finger joint care. Background Art

[0002] Stroke is one of the major diseases that endanger human health at present. Dysfunction of the upper limbs and hands after stroke is one of the common sequelae. Patients are prone to upper limb spasticity, reduced grip strength and poor finger joint movement after stroke. The rehabilitation treatment of such patients mostly requires the use of finger joint rehabilitation training devices, which allow patients to repeatedly bend and unfold their hands and apply force when bending their hands, thereby helping patients restore their grip strength.

[0003] The patent with announcement number CN208823350U discloses a pneumatic finger joint rehabilitation device, which is based on the control of an electronic controller and includes: a carrier as an installation base, a bracket mechanism fixed on the carrier for rehabilitation training of the patient's fingers, the bracket mechanism is provided with an airbag that is continuously inflated and deflated under the control of the electronic controller, and the bracket mechanism performs varicose movement driven by the inflation and deflation of the airbag.

[0004] However, the nerves that control the movement of the finger joints in the human hand are mainly distributed on the palm side of the palm. The current technology mainly uses an airbag mechanism on the back side of the palm to drive the movement of the finger joints. The finger nerves can only passively undergo repeated flexion and extension to gradually get used to and restore the sensing ability. The finger joint rehabilitation training takes a long time and the recovery efficiency is low. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention provides a rehabilitation training device for finger joint care.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0007] A rehabilitation training device for finger joint care is provided, comprising a carrier as an installation base, the carrier can be worn on the palm of a patient, a control system is arranged on the carrier, a plurality of finger joint connecting parts are connected to the carrier, the finger joint connecting parts include a plurality of movable shells hinged to each other, each movable shell is respectively attached to the outer side of each finger knuckle, the movable shell has an opening on one side close to the palm, a first driving member for driving the two movable shells to rotate relative to each other is arranged at the hinge axis of the movable shell, an air bag is arranged on the outer side of the opening on the movable shell, and the air bag is connected to an external pump air source through the carrier.

[0008] In a possible implementation, the finger joint connection part also includes a connecting shell, which is located between the movable shell and the carrier, one end of the connecting shell is hinged to the carrier, and the other end is hinged to the movable shell, the hinge axes at both ends of the connecting shell are perpendicular to each other, and a second driving member for driving the connecting shell to rotate is provided on the carrier.

[0009] In a possible implementation, both ends of the airbag are connected to air pipes, and a connection groove for the air pipe is opened on the movable shell. The air pipe at one end of the airbag is connected to an external pump air source through a carrier, and the air pipe at the other end is connected to an external exhaust pump through the carrier.

[0010] In a possible implementation, a first connecting frame is provided at one end of the movable shell close to the carrier, a transfer pipe is rotatably provided on the first connecting frame, two ends of the transfer pipe are respectively connected to an air pipe, and the air pipe is a hose.

[0011] In a possible implementation, a polytetrafluoroethylene film layer is provided on the surface of the airbag.

[0012] In a possible implementation, the first driving member and the second driving member are both micro motors, and an adjustment component for limiting the rotation angle of the movable shell and the connecting shell is provided on the carrier. The adjustment component includes a travel switch and a limit block. The limit block and the travel switch are respectively fixedly arranged on the two connected movable shells / the movable shell and the connecting shell / the connecting shell and the carrier. Travel switches are arranged on both sides of the limit block. The travel switch is rotatably arranged on the main body with the hinge shaft as the center, and the travel switch is used to turn off the micro motor.

[0013] In a possible implementation, two adjustment rings are provided on the main body where the travel switch is located for damping rotation, an adjustment frame is provided on the adjusting ring along its own radial damping sliding, two travel switches are respectively arranged on the two adjustment frames, a limit ring coaxial with the adjustment ring is fixedly provided on the main body where the adjusting ring is located, a plurality of limit parts are provided on the outer wall of the limit ring at intervals along its own circumferential direction, a limit groove for cooperating with the limit part is provided at one end of the adjustment frame close to the limit part, when the limit part cooperates with the limit groove, the limit block can abut against the travel switch, and when the limit part is disengaged from the limit groove, the limit block can abut against the adjustment frame.

[0014] In one possible implementation, a detection component for detecting flexion and extension of finger joints is provided on the carrier, the detection component includes an installation box arranged on the carrier side close to the palm, a plurality of winding drums are rotatably arranged in the installation box, a transmission line is wound on the winding drums, an elastic member for driving the winding drums to rotate to wind up the transmission line is provided in the installation box, the movable end of the transmission line is connected to a movable shell in the finger joint connecting part away from the carrier, and a sensor for real-time detection of the torque applied to the elastic member is provided in the installation box.

[0015] In one possible implementation, a spherical connector is provided at the movable end of the transmission line, a second connecting frame is provided on the movable shell farthest from the carrier, the second connecting frame is located on the side of the movable shell close to the palm, a connecting groove adapted to the connector is provided on the second connecting frame, a limiting cover is rotatably provided on the second connecting frame, the movable end of the limiting cover is snap-connected to the second connecting frame, and a clearance groove for the transmission line to pass through is provided on the limiting cover.

[0016] The beneficial effects of the present invention are:

[0017] 1. When medical staff conduct rehabilitation training on the patient's finger joints, they wear the carrier on the patient's palm and are controlled by the control system to make one or more of the finger joint connections move in sequence and synchronously according to the program setting sequence, so as to conduct rehabilitation training on the patient's palm and finger joints. While the finger joint connection moves, air is intermittently filled into the airbag to expand and press the patient's finger pulp, which can relax the tendons and strengthen the patient's perception of the finger during the flexion and extension of the finger, thereby improving the rehabilitation training effect of the patient's finger joints;

[0018] 2. In the case where the patient has partially recovered the perception ability of the finger joints, a sensor is used to detect the patient's finger movement trend, and then the program controls the finger joint connection to perform the movement, so that the patient can fully perform the entire movement and enhance the rehabilitation training effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the rehabilitation training device in the embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the overall structure of the finger joint connection part in the embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of the partial structure of the finger joint connection part in the embodiment of the present application;

[0022] Figure 4 for Figure 3 A magnified schematic diagram of part A;

[0023] Figure 5 Schematic diagram of the internal structure of the installation box in the embodiment of the present application.

[0024] Among them, 1. carrier; 11. control system; 2. finger joint connection part; 21. movable shell; 211. connection groove; 22. airbag; 221. air pipe; 23. connection shell; 24. first drive member; 25. second drive member; 26. first connecting frame; 261. transfer tube; 3. adjustment component; 31. travel switch; 32. limit block; 33. adjustment ring; 34. adjustment frame; 341. limit groove; 35. limit ring; 4. installation box; 41. winding drum; 42. transmission line; 43. elastic member; 44. second connecting frame; 45. limit cover; 46. clearance groove; 47. sensor. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] The embodiment of the present invention provides a rehabilitation training device for finger joint care, referring to Figure 1 , Figure 2 and Figure 3 , including a carrier 1 as an installation basis, the carrier 1 can be worn on the palm of the patient. In the embodiment of the present application, the carrier 1 can be made of soft silicone material, and a control system is arranged on the carrier 1. The control system 11 can be a control box installed on the top of the carrier 1, and the control box is provided with components such as a control circuit board and an electronic valve. A plurality of finger joint connecting parts 2 are connected to the carrier 1, corresponding to each finger respectively, and each finger joint connecting part 2 includes a plurality of movable shells 21 hinged to each other, and the movable shells 21 correspond to the finger joints of each finger one by one, and each movable shell 21 is respectively attached to the side of each finger knuckle away from the palm, and the movable shell 21 is opened on the side close to the palm, and the hinge axis between the movable shells 21 is parallel to the midline of rotation of the knuckle when the finger is flexed and extended, and a first driving member 24 for driving the two movable shells 21 to rotate relative to each other is arranged at the hinge axis of the movable shell 21, and an air bag 22 is arranged on the outside of the opening of each movable shell 21, and an air pipe 221 is connected to the air bag 22, and the air pipe 221 is connected to an external pump air source and an exhaust device after passing through the carrier 1, and the pump air source can be a pulse air pump.

[0027] Specifically, the first driving member 24 can be a micro motor, and each first driving member 24 is connected to the control system 11 by telecommunication. When the patient's finger joints are undergoing rehabilitation training, the patient wears the carrier 1 on his hand, inserts his fingers into each finger joint connection part 2 one by one, connects the control system 11 and the pump air source through a computer or a control seat, and starts the micro motor and the pump air source through program control to drive each movable shell 21 of the finger joint connection part 2 to rotate, so that the device drives the patient's fingers to passively flex and extend, and through repeated flexion and extension movements, the patient recovers the ability to sense and control flexion and extension of the finger joints. The control system 11 can set a variety of training modes, can control the flexion and extension of all finger joint connections 2 at the same time, or drive one or more finger joint connections 2 to flex and extend separately, and can also control the flexion and extension rate of the finger joint connection part 2, and perform training of different intensities and modes on the patient's palm.

[0028] During repeated flexion and extension training, the control system 11 can be used to control the introduction of pulsed airflow into the airbag 22, causing the airbag 22 to inflate intermittently, thereby pressing the inner side of the knuckles in the movable shell 21, which not only massages the knuckles to promote blood flow, but also presses the tendons to increase stimulation of the tendons and accelerate the patient's perception of stimulation of the palm.

[0029] In the embodiment of the present application, both ends of the airbag 22 are connected with an air pipe 221, and a connection groove 211 for the air supply pipe 221 to be clamped is provided on the movable shell 21. The air pipe 221 at one end of the airbag 22 is connected to an external pump gas source through the carrier 1, and the air pipe 221 at the other end is connected to an external exhaust device through the carrier 1, and the exhaust device can be an exhaust pump. A pulse air pump is used to blow air into the cavity, and an exhaust pump can be used to accelerate the discharge of gas in the airbag 22. In the embodiment of the present application, a first connecting frame 26 is provided at one end of each movable shell 21 close to the carrier 1, and the first connecting frame 26 is located on the side that can be moved away from the knuckle. A transfer pipe 261 is rotatably installed on the first connecting frame 26, and its rotation axis is parallel to the rotation axis of the movable shell 21. The air pipe 221 adopts a hose, and the transfer pipe 261 is arranged on the air pipe 221, and both ends of the transfer pipe 261 are connected to the air pipe 221. When the patient's palms are flexed, the movable shells 21 rotate relative to each other, and the soft tube-made trachea 221 can have movable flow, and the transfer tube 261 is used to guide the trachea 221 on two adjacent movable shells 21, thereby avoiding the trachea 221 from being blocked or even ruptured due to the folding angle when the movable shell 21 rotates.

[0030] Furthermore, except for the transfer tube 261 farthest from the carrier 1 of each finger joint connection part 2, the ends of the other transfer tubes 261 far from the carrier 1 are all connected to branch joints, one end of the branch joint is connected to the transfer tube 261, and the other two ends are respectively connected to the cylinder on the movable shell 21 and the transfer tube 261 far from the carrier 1 through the air pipe 221. Therefore, two transfer tubes 261 can be rotatably installed on each first connecting frame 26, and the air pipes 221 connected to the two transfer tubes 261 are respectively connected to the pump air source and the air extraction device. By using the branch joint, the airbags 22 on the entire finger joint connection part 2 are connected in parallel, so as to improve the efficiency of filling and deflation of the airbags 22 on the entire finger joint connection part 2.

[0031] In the embodiment of the present application, the finger joint connection part 2 also includes a connection shell 23, the connection shell 23 is located between the movable shell 21, one end of the connection shell 23 is hinged to the carrier 1, and the other end is hinged to the movable shell 21, the hinge axes at both ends of the connection shell 23 are perpendicular to each other, and the carrier 1 is provided with a second driving member 25 for driving the connection shell 23 to rotate. The second driving member 25 can also be a micro motor, and the second driving motor drives the connection shell 23 to rotate relative to the carrier 1, so that the entire finger joint connection part 2 can rotate relative to the carrier 1, so that the device is suitable for training the opening and closing movements of the patient's fingers.

[0032] Furthermore, a polytetrafluoroethylene film layer can be provided on the surface of the airbag 22 to reduce the surface friction of the airbag 22. When the patient's fingers are flexed and extended, the expansion of the airbag 22 will compress the fingers, and also increase the friction between the two. By providing a polytetrafluoroethylene film layer on the surface of the airbag 22, the airbag 22 can move smoothly relative to the knuckles, avoiding damage to the airbag 22 or abrasions on the surface of the patient's fingers.

[0033] Reference Figure 4 In the embodiment of the present application, an adjustment component 3 for limiting the rotation angle of the movable shell 21 and the connecting shell 23 is provided on the carrier 1. The adjustment component 3 can be a travel switch 31 and a limit block 32. The limit block 32 and the travel switch 31 are respectively fixedly arranged on the two connected movable shells 21 / the movable shell 21 and the connecting shell 23 / the connecting shell 23 and the carrier 1. Travel switches 31 are arranged on both sides of the limit block 32. The travel switch 31 is rotatably arranged on the main body with the hinge axis as the center. The travel switches 31 are all connected to the control system 11 by telecommunication. The limit block 32 contacts the travel switch 31 during the movable rotation process, and the micro motor is turned off in time to prevent the movable shell 21 and the connecting shell 23 from rotating excessively.

[0034] Furthermore, since the range of motion of the fingers of different patients is different, the active angle of each finger joint connection part 2 needs to be calibrated before the device is used. In the embodiment of the present application, two adjustment rings 33 are provided on the main body where the travel switch 31 is located for damping rotation, and an adjustment frame 34 is provided on the adjustment ring 33 for radial damping sliding. The two travel switches 31 are respectively arranged on the two adjustment frames 34, and a limit ring 35 coaxial with the adjustment ring 33 is fixedly provided on the main body where the adjustment ring 33 is located. A plurality of limit parts are provided on the outer wall of the limit ring 35 at intervals along its own circumferential direction. A limit groove 341 for cooperating with the limit part is provided at one end of the adjustment frame 34 close to the limit part. When the limit part cooperates with the limit groove 341, the limit block 32 can abut against the travel switch 31, and when the limit part is disengaged from the limit groove 341, the limit block 32 can abut against the adjustment frame 34. During actual operation, the adjustment frame 34 on each adjustment ring 33 is first extended outward, and the adjustment ring 33 is rotated to be close to the limit block 32. The medical staff guides the patient's palm to perform a knuckle flexion and extension movement and a finger opening and closing movement. During the rotation of the connecting shell 23 and the movable shell 21, the limit block 32 thereon pushes the adjustment frame 34 and the adjustment ring 33 to rotate to the maximum stroke, and then each adjustment frame 34 is moved to the limit portion to cooperate with the limit groove 341, that is, the position of the travel switch 31 is determined, so that when the device drives the patient's palm to flex and extend, the range of movement is within the feasible flexion and extension range of the patient's hand.

[0035] Reference Figure 5In order to enable the device to be used in more scenarios, a detection component for detecting flexion and extension of finger joints is provided on the carrier 1. The detection component detects the movement trend of the patient's palm that has recovered some sensing ability, and the control system 11 controls the first driving member 24 and the second driving member to drive the corresponding movable shell 21 and the connecting shell 23 to move toward the patient's palm, thereby assisting the patient to complete the flexion and extension movement and accelerating the patient's familiarity with the complete flexion and extension operation, which can effectively avoid tissue damage caused by the patient's palm movement being out of sync with the device movement when the patient's palm recovers some sensing ability to flex and extend.

[0036] In some examples, the detection assembly includes a mounting box 4 disposed on the carrier 1 near the palm side, a plurality of winding drums 41 are rotatably disposed in the mounting box 4, a transmission line 42 is wound on the winding drums 41, an elastic member 43 is disposed in the mounting box 4 for driving the winding drums 41 to rotate to reel up the transmission line 42, the movable end of the transmission line 42 is connected to the movable shell 21 in the finger joint connection part 2 away from the carrier 1, and a sensor 47 for real-time detection of the torque applied to the elastic member 43 is disposed in the mounting box 4. The elastic member 43 may be a torsion spring, and the sensor 47 may be a torque sensor 47. In actual use, if the patient's palm is flexed, the patient's knuckles start to flex first, and the fingertips approach the palm during the flexion process. Under the torsion of the torsion spring, the winding drum 41 is driven to reel in the transmission line 42, and the transmission line 42 is always kept straight. After the sensor 47 detects that the torque force is reduced and the change exceeds the preset value, the control system 11 determines and drives the first driving member 24 in the corresponding finger joint connection part 2 to move, and each movable shell 21 rotates to approach the patient's finger and assist the patient's finger to complete a complete flexion action. The stretching action has the same principle as the flexion action, which will not be repeated here.

[0037] Furthermore, a control button may be added to the control system 11 or a control menu may be added to the control panel to control each finger joint connection part 2 individually or to control multiple finger joint connection parts 2 simultaneously to perform flexion and extension actions individually.

[0038] In some embodiments, the end of the transmission line 42 close to the movable shell 21 can be detachably connected to the movable shell 21. The detachable design allows medical staff to disassemble the transmission line 42 in a timely manner according to the training and rehabilitation process of the patient's finger joints, thereby reducing the frequent use of the elastic member 43. Specifically, a spherical connector is provided at the movable end of the transmission line 42, and a second connecting frame 44 is provided on the movable shell 21 farthest from the carrier 1. The second connecting frame 44 is located on the side of the movable shell 21 close to the palm. A connecting groove 211 adapted to the connector is provided on the second connecting frame 44. A limit cover 45 is rotatably provided on the second connecting frame 44. The movable end of the limit cover 45 is connected to the second connecting frame 44 by snapping, and a clearance groove 46 for the transmission line 42 to pass through is provided on the limit cover 45. The connection operation of the transmission line 42 and the movable shell 21 can be completed by placing the connector into the connecting groove 211 and covering the limit cover 45 on the second connecting frame 44. Furthermore, the second connecting frame 44 can be rotatably connected relative to the movable shell 21, so that when the finger joint connecting part 2 moves, the second connecting frame 44 rotates accordingly, so that the connecting head and the transmission line 42 on it are always facing the mounting box 4 on the carrier 1, thereby improving the accuracy of the sensor 47 in detecting the torque of the elastic member 43.

[0039] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments once those skilled in the art are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A rehabilitation training device for finger joint care, characterized in that: The invention comprises a carrier (1) as an installation base, wherein the carrier (1) can be worn on the palm of a patient, a control system (11) is arranged on the carrier (1), a plurality of finger joint connection parts (2) are connected to the carrier (1), the finger joint connection parts (2) include a plurality of movable shells (21) hinged to each other, each movable shell (21) is respectively attached to the outer side of each finger joint, the movable shell (21) has an opening on one side close to the palm, a first driving member (24) for driving the two movable shells (21) to rotate relative to each other is arranged at the hinge axis of the movable shell (21), an air bag (22) is arranged on the outer side of the opening on the movable shell (21), and the air bag (22) is connected to an external pump air source through the carrier (1).

2. A rehabilitation training device for finger joint care according to claim 1, characterized in that: The finger joint connection part (2) further comprises a connection shell (23), wherein the connection shell (23) is located between the movable shell (21) and the carrier (1), one end of the connection shell (23) is hinged to the carrier (1), and the other end is hinged to the movable shell (21), the hinge axes at both ends of the connection shell (23) are perpendicular to each other, and a second driving member (25) for driving the connection shell (23) to rotate is provided on the carrier (1).

3. A rehabilitation training device for finger joint care according to claim 1, characterized in that: Both ends of the air bag (22) are connected to an air pipe (221); a connection groove (211) for clamping the air supply pipe (221) is provided on the movable shell (21); the air pipe (221) at one end of the air bag (22) is connected to an external pump air source through the carrier (1); and the air pipe (221) at the other end is connected to an external exhaust pump through the carrier (1).

4. A rehabilitation training device for finger joint care according to claim 3, characterized in that: A first connecting frame (26) is arranged at one end of the movable shell (21) close to the carrier (1), a transfer pipe (261) is rotatably arranged on the first connecting frame (26), two ends of the transfer pipe (261) are respectively connected to an air pipe (221), and the air pipe (221) is a hose.

5. A rehabilitation training device for finger joint care according to claim 1, characterized in that: A polytetrafluoroethylene film layer is provided on the surface of the airbag (22).

6. A rehabilitation training device for finger joint care according to claim 2, characterized in that: The first driving member (24) and the second driving member (25) are both micromotors. The carrier (1) is provided with an adjustment component (3) for limiting the rotation angle of the movable shell (21) and the connecting shell (23). The adjustment component (3) comprises a travel switch (31) and a limit block (32). The limit block (32) and the travel switch (31) are respectively fixedly arranged on the two connected movable shells (21) / the movable shell (21) and the connecting shell (23) / the connecting shell (23) and the carrier (1). Travel switches (31) are arranged on both sides of the limit block (32). The travel switch (31) is rotatably arranged on the main body with the hinge axis as the center. The travel switch (31) is used to turn off the micromotors.

7. A rehabilitation training device for finger joint care according to claim 6, characterized in that: The main body where the travel switch (31) is located is provided with two adjusting rings (33) for damping rotation, and the adjusting ring (33) is provided with an adjusting frame (34) for damping sliding along its radial direction. The two travel switches (31) are respectively arranged on the two adjusting frames (34). The main body where the adjusting ring (33) is located is fixedly provided with a limiting ring (35) coaxial with the adjusting ring (33), and a plurality of limiting parts are arranged on the outer wall of the limiting ring (35) along its circumferential direction at intervals. A limiting groove (341) for cooperating with the limiting part is provided at one end of the adjusting frame (34) close to the limiting part. When the limiting part cooperates with the limiting groove (341), the limiting block (32) can abut against the travel switch (31), and when the limiting part is separated from the limiting groove (341), the limiting block (32) can abut against the adjusting frame (34).

8. A rehabilitation training device for finger joint care according to claim 7, characterized in that: The carrier (1) is provided with a detection component for detecting the flexion and extension of the finger joints. The detection component comprises a mounting box (4) arranged on the carrier (1) near the palm side. A plurality of winding drums (41) are rotatably arranged in the mounting box (4). A transmission line (42) is wound around the winding drums (41). An elastic member (43) for driving the winding drums (41) to rotate so as to reel in the transmission line (42) is arranged in the mounting box (4). The movable end of the transmission line (42) is connected to a movable shell (21) in the finger joint connecting part (2) away from the carrier (1). A sensor (47) for real-time detection of the torque applied to the elastic member (43) is arranged in the mounting box (4).

9. A rehabilitation training device for finger joint care according to claim 8, characterized in that: The movable end of the transmission line (42) is provided with a spherical connector, and a second connecting frame (44) is provided on the movable shell (21) farthest from the carrier (1), the second connecting frame (44) is located on the side of the movable shell (21) close to the palm, the second connecting frame (44) is provided with a connecting groove (211) adapted to the connector, and a limit cover (45) is rotatably provided on the second connecting frame (44), the movable end of the limit cover (45) is snap-connected to the second connecting frame (44), and the limit cover (45) is provided with a clearance groove (46) for the transmission line (42) to pass through.

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