Circuit protection device with intelligent fault early warning function

Abstract

The invention discloses a circuit protection device with an intelligent fault early warning function. The circuit protection device comprises an installation shell, an electric connection assembly and a protection assembly. The installation shell is composed of a first transverse section, a second transverse section and a vertical section connected with the first transverse section and the second transverse section. A first electric connecting piece, a second electric connecting piece and an isolation piece are arranged in the electric connecting assembly. A protection base, a driving piece, a manual piece, a rotating piece, a rotating piece and a locking piece are arranged in the protection assembly, and the rotating piece and the locking piece are arranged in the rotating piece. According to the circuit protection device with the intelligent fault early warning function, driving can be achieved through one driving piece in a manual and electric mode, the first electric connecting piece and the second electric connecting piece in the electric connecting assembly can be rapidly disconnected, and the rapid disconnection effect is achieved. After the circuit is disconnected, a limiting effect can be achieved through the isolation piece, reverse reset cannot be achieved, the safety performance of circuit protection is improved, and accidents are avoided.

Description

Technical Field

[0001] The present invention relates to circuit protection technology, and in particular to a circuit protection device with intelligent fault early warning function. Background Art

[0002] The rapid development of informatization has made people more and more dependent on electronic equipment and products, and these electronic equipment and products are inseparable from the power supply. The safety of the power supply has become the focus of people's attention. In order to ensure the safety of electricity use, people have installed switch circuit protectors in electrical appliances. Traditional switch circuit protectors can heat and deform the bimetallic strip and separate the moving and static contacts through current overload to achieve the purpose of cutting off the power supply circuit.

[0003] However, it adopts manual closing, which is not suitable for some environments. And it cannot play a limiting effect when manually closed, resulting in the circuit being able to be closed infinitely after being disconnected, which poses certain safety hazards. Summary of the invention

[0004] In order to solve the defects of the prior art mentioned above, the present invention proposes a circuit protection device with intelligent fault warning function.

[0005] The technical solution of the present invention is achieved in this way:

[0006] A circuit protection device with intelligent fault early warning function, comprising:

[0007] A mounting shell, the mounting shell is composed of a first transverse section, a second transverse section and a vertical section connecting the first transverse section and the second transverse section, and the vertical section is provided with a movable opening,

[0008] An electrical connection component is arranged in the middle of the mounting housing, wherein the electrical connection component is provided with a first electrical connection member, a second electrical connection member and an isolating member, wherein the first electrical connection member is mounted on the first transverse section, the second electrical connection member and the isolating member are mounted on the second transverse section, and the first electrical connection member is arranged between the second electrical connection member and the isolating member,

[0009] and a protection component arranged in the middle of the mounting shell, the protection component being mounted on the second transverse section, the protection component being provided with a protection seat, a driving member, a manual member, a rotating member, and a rotating member and a locking member arranged inside the rotating member, the manual member being arranged in the movable opening, the driving member being mounted in the middle of the protection seat through a first rotating shaft, the manual member being mounted in the middle of the protection seat through a second rotating shaft, a first spring being arranged between the driving member and the manual member, pressing the manual member to keep the manual member pushing the driving member to rotate around the first rotating shaft, pushing the second electrical connector, and keeping the second electrical connector separated from the first electrical connector,

[0010] A rotating shaft is provided at one end of the rotating member, a motor cooperating with the rotating shaft is provided on the protective seat, the locking members are rotationally symmetrically arranged on both sides of the rotating member, and one end of the locking member is installed in the middle of the protective seat through a third rotating shaft. The rotation of the motor drives the rotating member to rotate, pushes one end of the locking member to rotate, maintains contact with the inner wall of the rotating member, drives the rotating member to rotate, and pushes the driving member through the rotating member to push the second electrical connector, thereby keeping the second electrical connector separated from the first electrical connector.

[0011] In the present invention, symmetrical baffles are provided on both sides of the protection seat, and an electromagnetic component is provided on the second transverse section. The electromagnetic component is arranged at the lower end of the baffle, and a pushing area is formed between the electromagnetic component and the baffle.

[0012] In the present invention, a second spring is provided at the upper end of the protection seat, the upper end of the second spring is in contact with the first transverse section structure, and the lower end of the second spring is in contact with the protection seat.

[0013] In the present invention, the first electrical connector is provided with symmetrically arranged contact arms, and a first avoidance area is formed between the contact arms.

[0014] In the present invention, a second avoidance area is provided in the middle of the isolation member, an elastic sheet is provided in the second avoidance area, symmetrically arranged blocking parts are provided on the elastic sheet, and the distance between the blocking parts is greater than the width of the second avoidance area.

[0015] In the present invention, a driving block and a limiting opening are provided on the driving member, the driving block pushes the elastic sheet and the second electrical connecting member, and the limiting opening cooperates with the elastic sheet to limit the position.

[0016] In the present invention, a positioning block is provided on the protection seat, a avoiding surface and a blocking surface are provided at the lower end of the positioning block, and a contact surface cooperating with the blocking surface is provided on the driving member.

[0017] In the present invention, an arc-shaped opening is provided in the middle of the protection seat, the rotating member is arranged in the arc-shaped opening, and the arc angle of the arc-shaped opening is a major arc.

[0018] In the present invention, a first pushing protrusion is provided on the rotating member, and the first pushing protrusion pushes the driving member. A mounting hole is formed in the middle of the rotating member, and a first limiting step is provided on the inner wall of the mounting hole in a rotationally symmetrical manner. The locking member is provided with a second limiting step that cooperates with the first limiting step.

[0019] In the present invention, a first through hole is provided in the middle of the locking member, and a second through hole is provided in the middle of the rotating member. The first through hole and the second through hole are arranged correspondingly. A positioning rod is provided in the first through hole. A tension spring is provided on the positioning rod between the locking member and the locking member, and the tension spring is arranged in the first through hole and the second through hole.

[0020] The circuit protection device with intelligent fault warning function implemented in the present invention has the following beneficial effects: the circuit protection device with intelligent fault warning function can be driven manually and electrically through a driving member, and can quickly disconnect the first electrical connector and the second electrical connector in the electrical connection assembly, achieving a quick disconnection effect. After the circuit is disconnected, the isolation member can play a limiting effect and cannot be reversed and reset, thereby improving the safety performance of the circuit protection and avoiding accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a circuit protection device with intelligent fault early warning function of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure in another direction;

[0023] Figure 3 for Fig.11 The main view of

[0024] Figure 4 for Figure 1 A top view of

[0025] Figure 5 for Figure 4 The cross-sectional view at AA in FIG.

[0026] Figure 6 for Figure 5 A schematic diagram of the electrical connection assembly structure;

[0027] Figure 7 for Figure 6 Exploded diagram of

[0028] Figure 8 for Figure 7 A schematic diagram of the structure in another direction;

[0029] Fig. 9 for Figure 5 Schematic diagram of the protection component structure in;

[0030] Fig.10 for Fig. 9 Exploded diagram of

[0031] Fig.11 for Fig.10Schematic diagram of the protection seat structure;

[0032] Fig.12 for Fig.10 Schematic diagram of the driving component structure in FIG.

[0033] Fig.13 for Fig.10 Schematic diagram of the manual parts structure in ;

[0034] Fig.14 for Fig.10 Schematic diagram of the rotating part structure;

[0035] Fig.15 for Fig.10 A schematic diagram of the structure of the rotating member and the locking member in FIG.

[0036] Fig.16 for Fig.15 Main perspective view.

[0037] In the figure: mounting housing 1, electrical connection component 2, protection component 3, first transverse section 4, second transverse section 5, vertical section 6, movable opening 7, manual member 8, driving member 9, second spring 10, second electrical connection member 11, connection section 12, mounting section 13, first electrical connection member 14, detector 15, motor 16, rotating member 17, locking member 18, rotating member 19, first limiting step 20, second limiting step 21, isolating member 22, first fixing section 23, first contact section 24, contact arm 25, first avoidance area 26, arc section 27, second fixing section 28, second contact section 29, contact portion 30, extension section 31, second avoidance area 32, elastic sheet 33, arc section 34, blocking portion 35, first rotating shaft 36, driving block 37, limiting opening 38, end 39 1. Protection seat 39, second rotating axis 40, active area 41, first rotating hole 42, second rotating hole 43, arc-shaped mouth 44, third rotating hole 45, fourth rotating hole 46, third rotating axis 47, rotating axis 48, positioning block 49, avoidance surface 50, blocking surface 51, contact surface 52, moving gap 53, first spring 54, first limiting buckle 55, second limiting buckle 56, support plate 57, limiting surface 58, bearing surface 59, stop block 60, second pushing protrusion 61, pushing surface 62, pressing surface 63, baffle 64, electromagnetic member 65, pushing area 66, first pushing protrusion 67, arc-shaped surface 68, mounting hole 69, hinged end 70, free end 71, first through hole 72, second through hole 73, positioning rod 74, tension spring 75, sliding portion 76, strip hole 77. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0039] like Figures 1 to 16 As shown, the circuit protection device with intelligent fault warning function of the present invention includes an installation shell 1, an electrical connection component 2 and a protection component 3. The electrical connection component 2 and the protection component 3 are both arranged inside the installation shell 1. The electrical connection component 2 is used to maintain the connectivity of the circuit, and the protection component 3 is used to realize the connection and disconnection of the electrical connection component 2. When a fault occurs, it can be disconnected manually or electrically.

[0040] The mounting housing 1 is composed of a first transverse section 4, a second transverse section 5, and a vertical section 6 connecting the first transverse section 4 and the second transverse section 5. The vertical section 6 is provided with a movable opening 7, which is used for the installation of a manual member 8, so that the manual member 8 can rotate therein, thereby pushing the driving member 9. In addition, the manual member 8 can be kept to drive the entire protection assembly 3 to move upward, thereby compressing the second spring 10, so that the driving member 9 that pushes the second electrical connector 11 is reset.

[0041] The lower end of the first transverse section 4 is provided with a connecting section 12 and a mounting section 13, and the first electrical connector 14 is provided at the lower end of the mounting section 13. A detector 15 is provided on the second transverse section 5, which is used to detect whether the circuit voltage increases. If it exceeds a preset value, a command will be sent to the motor 16, and the motor 16 rotates to drive the rotating member 17 to rotate, and the rotating member 17 pushes the locking member 18, and the locking member 18 contacts the rotating member 19, keeping the first limiting step 20 and the second limiting step 21 matched, driving the rotating member 19 to rotate, thereby pushing the driving member 9 to separate the second electrical connector 11 and the first electrical connector 14.

[0042] The electrical connection assembly 2 is arranged in the middle of the mounting housing 1, and is provided with a first electrical connection member 14, a second electrical connection member 11 and an isolation member 22. The isolation member 22 is made of insulating material, and the manual member 8, the driving member 9 and the rotating member 19 are all made of insulating material.

[0043] The first electrical connector 14 is mounted on the first transverse section 4 , the second electrical connector 11 and the isolating member 22 are mounted on the second transverse section 5 , and the first electrical connector 14 is disposed between the second electrical connector 11 and the isolating member 22 .

[0044] The first electrical connector 14 is composed of a first fixing section 23 and a first contact section 24. The first fixing section 23 is arranged at the lower end of the installation section 13. The first contact section 24 is provided with symmetrical contact arms 25, and a first avoidance area 26 is formed between the contact arms 25. The contact arms 25 are connected to the first contact sections 24 through an arc section 27. In a normal state, the arc section 27 is in a disappearing state. After installation, the contact arms 25 are pushed by the second electrical connector 11, so that the arc section 27 is formed at the connection with the first contact section 24.

[0045] The second electrical connector 11 is composed of a second fixing section 28 and a second contact section 29. The second fixing section 28 is installed on the second transverse section 5. The second fixing section 28 is arranged horizontally, while the second contact section 29 is arranged obliquely. When not installed, the angle between the second fixing section 28 and the second contact section 29 is greater than 90°. After installation, since the second contact section 29 contacts the first contact section 24, the contact arm 25 is pushed to deform and form the arc section 27. At this time, the second contact section 29 and the second fixing section 28 are kept in a vertical state.

[0046] The second contact segment 29 is provided with a contact portion 30, which is relatively thick and can push the contact arm 25. The second contact segment 29 is also provided with an extension segment 31, which contacts the first contact segment 24, and can better increase the contact area and achieve stable connection of the circuit.

[0047] A second avoidance area 32 is provided in the middle of the isolating member 22, and an elastic sheet 33 is provided in the second avoidance area 32, and the elastic sheet 33 is connected to the second avoidance area 32 through an arc portion 34. The first avoidance area 26 and the second avoidance area 32 are both used to avoid the driving member 9. The elastic sheet 33 is provided with symmetrically arranged blocking portions 35, and the distance between the blocking portions 35 and the blocking portions 35 is greater than the width of the second avoidance area 32. The blocking portion 35 can limit the elastic sheet 33 from entering the second avoidance area 32, so that when the driving member 9 is placed on the elastic sheet 33, the first contact segment 24 and the second contact segment 29 can be kept separated by a large distance, thereby achieving a safe isolation effect.

[0048] After the driving member 9 rotates around the first rotating shaft 36, the driving member 9 will first enter the second avoidance area 32, push the elastic sheet 33, and keep the elastic sheet 33 pushing the second contact section 29, so that the second electrical connector 11 is separated from the first electrical connector 14, and the circuit is disconnected. Then the driving block 37 on the driving member 9 supports the second contact section 29, and the elastic sheet 33 is reset under its own elastic force, and the limit opening 38 is kept placed on the end 391 of the elastic sheet 33 to support the driving member 9, so that the driving member 9 will not reset. The first rotating shaft 36 on the driving member 9 is at the upper end of the driving member 9, so the lower end is heavier and naturally rotates downward under its own gravity, thereby keeping the lower end of the driving member 9 on the elastic sheet 33.

[0049] The protection assembly 3 is arranged in the middle of the mounting housing 1, and the protection assembly 3 is mounted on the second transverse section 5. The protection assembly 3 is provided with a protection seat 39, a driving member 9, a manual member 8, a rotating member 19, and a rotating member 17 and a locking member 18 arranged inside the rotating member 19, the manual member 8 is arranged in the movable opening 7, the driving member 9 is mounted in the middle of the protection seat 39 through the first rotating shaft 36, and the manual member 8 is mounted in the middle of the protection seat 39 through the second rotating shaft 40.

[0050] An active area 41 is provided in the middle of the protection seat 39, and the driving member 9 and the manual member 8 are arranged in the active area 41. A first rotation hole 42 and a second rotation hole 43 are provided in the active area 41, and the first rotation shaft 36 is installed in the first rotation hole 42, and the second rotation shaft 40 is installed in the second rotation hole 43. A third rotation hole 45 and a fourth rotation hole 46 are provided in the arc-shaped opening 44, and the third rotation shaft 47 is installed in the third rotation hole 45, and the rotation shaft 48 is provided in the fourth rotation hole 46.

[0051] The protection seat 39 is provided with a positioning block 49, the lower end of which is provided with an avoidance surface 50 and a blocking surface 51, and the driving member 9 is provided with a contact surface 52 that matches the blocking surface 51. A moving gap 53 is formed between the contact surface 52 and the blocking surface 51.

[0052] A first spring 54 is provided between the driving member 9 and the manual member 8, a first limit buckle 55 is provided on the driving member 9, the first limit buckle 55 is arranged in an inclined manner, a second limit buckle 56 is provided on the manual member 8, and the first spring 54 is arranged between the first limit buckle 55 and the second limit buckle 56. A support plate 57 is provided in the active area 41, and the first spring 54 is arranged on the support plate 57.

[0053] The driving member 9 is provided with a driving block 37 and a limiting opening 38 . The driving block 37 pushes the elastic sheet 33 and the second electrical connector 11 , and the limiting opening 38 cooperates with the elastic sheet 33 to limit position.

[0054] At the same time, a limiting surface 58 cooperating with the second limiting buckle 56 is provided in the active area 41 to limit the upward rotation angle of the manual member 8. A bearing surface 59 is also provided in the active area 41 to limit the downward rotation angle of the manual member 8. A stopper 60 is provided at the active area 41 to limit the second limiting buckle 56. The manual member 8 is provided with a second pushing protrusion 61 to push the driving member 9, and the driving member 9 is provided with a pushing surface 62 cooperating with the second pushing protrusion 61. In addition, a downward pressing surface 63 cooperating with the bearing surface 59 is provided on the manual member 8.

[0055] Symmetrical baffles 64 are provided on both sides of the protection seat 39, and an electromagnetic member 65 is provided on the second transverse section 5. The electromagnetic member 65 is arranged at the lower end of the baffle 64, and a pushing area 66 is formed between the electromagnetic member 65 and the baffle 64. After the electromagnetic member 65 is energized, it can keep pushing the protection seat 39 upward, so that the driving member 9 supporting the second electrical connector 11 on the elastic sheet 33 is reset. The baffle 64 is a magnet, and the surfaces of the baffle 64 and the electromagnetic member 65 facing each other have the same magnetic poles.

[0056] The upper end of the protection seat 39 is provided with a second spring 10, the upper end of the second spring 10 is in contact with the first transverse section 4, and the lower end is in contact with the protection seat 39. It is convenient to reserve space for the protection seat 39 to move upward, thereby resetting the driving member 9.

[0057] The manual member 8 is pressed to keep the manual member 8 pushing the driving member 9 to rotate around the first rotating shaft 36 , pushing the second electrical connector 11 , and keeping the second electrical connector 11 separated from the first electrical connector 14 .

[0058] A rotating shaft 48 is provided at one end of the rotating member 17, a motor 16 cooperating with the rotating shaft 48 is provided on the protection seat 39, and the locking member 18 is rotationally symmetrically arranged on both sides of the rotating member 17, and one end of the locking member 18 is installed in the middle of the protection seat 39 through the third rotating shaft 47. The motor 16 rotates to drive the rotating member 17 to rotate, pushes one end of the locking member 18 to rotate, keeps in contact with the inner wall of the rotating member 17, drives the rotating member 17 to rotate, and pushes the driving member 9 through the rotating member 17 to push the second electrical connector 11, so as to keep the second electrical connector 11 separated from the first electrical connector 14.

[0059] An arc-shaped opening 44 is provided in the middle of the protection seat 39, and the rotating member 19 is arranged in the arc-shaped opening 44, and the arc angle of the arc-shaped opening 44 is a major arc.

[0060] The rotating member 19 is provided with a first pushing protrusion 67, and the driving member 9 is provided with an arc surface 68 that matches the first pushing protrusion 67, and the first pushing protrusion 67 pushes the driving member 9. A mounting hole 69 is formed in the middle of the rotating member 19, and a first limiting step 20 that is rotationally symmetrically arranged is provided on the inner wall of the mounting hole 69, and a second limiting step 21 that matches the first limiting step 20 is provided on the locking member 18.

[0061] The locking member 18 is composed of a hinged end 70 and a free end 71 , and the third rotation axis 47 is mounted on the hinged end 70 .

[0062] A first through hole 72 is provided in the middle of the locking member 18, and a second through hole 73 is provided in the middle of the rotating member 17. The first through hole 72 and the second through hole 73 are arranged correspondingly. A positioning rod 74 is provided in the first through hole 72. A tension spring 75 is provided on the positioning rod 74 between the locking member 18 and the locking member 18. The tension spring 75 is arranged in the first through hole 72 and the second through hole 73.

[0063] like Fig.16As shown, when the motor 16 drives the rotating member 17 to rotate in the direction of F1, the rotating member 17 can be kept to push the locking member 18 on the side, so that it rotates around the third rotating shaft 47, thereby stretching the tension spring 75. When the free end 71 contacts the inner wall of the mounting hole 69, the friction between them is small, and it is impossible to drive the rotating member 19 to rotate together. Only when the second limiting step 21 contacts the first limiting step 20 can the locking member 18 be kept to drive the rotating member 19 to rotate together, and the driving member 9 is pushed to rotate through the first pushing protrusion 67 on the rotating member 19. After the motor 16 rotates in the opposite direction, the locking member 18 will be reset under the tension of the tension spring 75, and the rotating member 19 will drive it to reset when the driving member 9 resets.

[0064] The protective seat 39 is provided with a symmetrical sliding portion 76, and a strip hole 77 is provided in the middle of the sliding portion 76. Bolts (not shown in the figure) are arranged in the strip hole 77 to install the protective seat 39 on the mounting shell 1. However, since the bolts are in the strip hole 77, the protective seat 39 can slide up and down, but will not detach from the mounting shell 1.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit protection device with intelligent fault warning function, characterized in that: include: A mounting shell, the mounting shell is composed of a first transverse section, a second transverse section and a vertical section connecting the first transverse section and the second transverse section, and the vertical section is provided with a movable opening, An electrical connection component is arranged in the middle of the mounting housing, wherein the electrical connection component is provided with a first electrical connection member, a second electrical connection member and an isolating member, wherein the first electrical connection member is mounted on the first transverse section, the second electrical connection member and the isolating member are mounted on the second transverse section, and the first electrical connection member is arranged between the second electrical connection member and the isolating member, And a protection component arranged in the middle of the mounting shell, the protection component is installed on the second transverse section, the protection component is provided with a protection seat, a driving member, a manual member, a rotating member, and a rotating member and a locking member arranged inside the rotating member, the manual member is arranged in the movable opening, the driving member is installed in the middle of the protection seat through a first rotating shaft, and the manual member is installed in the middle of the protection seat through a second rotating shaft, a first spring is arranged between the driving member and the manual member, pressing the manual member to keep the manual member to push the driving member to rotate around the first rotating shaft, push the second electrical connector, and keep the second electrical connector separated from the first electrical connector, one end of the rotating member is provided with a rotating shaft, and the protection seat is provided with a motor that cooperates with the rotating shaft, the locking member is rotationally symmetrically arranged on both sides of the rotating member, and one end of the locking member is installed in the middle of the protection seat through a third rotating shaft, the rotation of the motor drives the rotating member to rotate, pushes one end of the locking member to rotate, keeps in contact with the inner wall of the rotating member, drives the rotating member to rotate, and pushes the driving member through the rotating member to push the second electrical connector, and keeps the second electrical connector separated from the first electrical connector.

2. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: Symmetrical baffles are provided on both sides of the protection seat, and an electromagnetic component is provided on the second transverse section. The electromagnetic component is arranged at the lower end of the baffle, and a pushing area is formed between the electromagnetic component and the baffle.

3. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: A second spring is disposed at the upper end of the protection seat, wherein the upper end of the second spring is in contact with the first transverse section structure, and the lower end of the second spring is in contact with the protection seat.

4. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The first electrical connector is provided with symmetrically arranged contact arms, and a first avoidance area is formed between the contact arms.

5. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: A second avoidance area is provided in the middle of the isolating element. An elastic sheet is provided in the second avoidance area. The elastic sheet is provided with symmetrically arranged blocking parts. The distance between the blocking parts is greater than the width of the second avoidance area.

6. The circuit protection device with intelligent fault warning function according to claim 5, characterized in that: The driving member is provided with a driving block and a limiting opening, the driving block pushes the elastic sheet and the second electrical connecting member, and the limiting opening cooperates with the elastic sheet to limit position.

7. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The protection seat is provided with a positioning block, the lower end of the positioning block is provided with a avoiding surface and a blocking surface, and the driving member is provided with a contact surface matched with the blocking surface.

8. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: An arc-shaped opening is arranged in the middle of the protection seat, the rotating member is arranged in the arc-shaped opening, and the arc angle of the arc-shaped opening is a major arc.

9. The circuit protection device with intelligent fault warning function according to claim 1, characterized in that: The rotating member is provided with a first pushing protrusion, which pushes the driving member. A mounting hole is formed in the middle of the rotating member. A first limiting step which is rotationally symmetrically arranged is provided on the inner wall of the mounting hole. The locking member is provided with a second limiting step which cooperates with the first limiting step.

10. The circuit protection device with intelligent fault warning function according to claim 9, characterized in that: A first through hole is provided in the middle of the locking member, and a second through hole is provided in the middle of the rotating member. The first through hole and the second through hole are arranged correspondingly. A positioning rod is provided in the first through hole. A tension spring is provided on the positioning rod between the locking member and the locking member, and the tension spring is arranged in the first through hole and the second through hole.

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