Interlocking mechanism and automatic change-over switch

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an interlocking mechanism and an automatic change-over switch. The knob is rotationally mounted on the fixed bracket and is used for switching between an isolation position and a non-isolation position; the interlocking piece is connected with the fixed bracket through a sliding guide assembly; the driving piece is rotationally arranged in the fixed bracket and is linked with the rotating shaft of the moving contact; the side, close to the interlocking piece, of the driving piece is provided with a driving part, and the interlocking piece is provided with a triggering part abutting against the driving part. The moving contact moves towards the closing direction and drives the driving part to rotate, and the driving part pushes the interlocking part to approach the knob along the sliding path through the triggering part, so that the interlocking part abuts against the knob, and acting force for preventing the knob from rotating to the isolation position is generated. According to the invention, the position of the moving contact can be accurately judged, and the operation of a worker is facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of low-voltage electrical apparatus, in particular to a interlocking mechanism and automatic transfer switch. BACKGROUND

[0002] The double power automatic transfer switch is widely used in emergency power supply system. In order to ensure the reliable operation of the load, it is necessary to regularly cut off the power to maintain the electrical equipment. In order to prevent misoperation of the staff during maintenance, it is necessary to set a padlock on the automatic transfer switch to ensure that the power supply end and the load end are reliably isolated, so that the maintenance personnel can maintain the electrical equipment in a safe environment. When the padlock is cancelled, the switch can be automatically or manually switched to the closing position of the normal power supply or standby power supply. In order to achieve the above function, the current mechanism has many parts and requires a large operating force, which is not convenient for the staff to operate. In addition, the existing mechanism is prone to jamming, and the position of the moving contact cannot be accurately determined in the jamming state. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the present application is to provide an interlocking mechanism and automatic transfer switch, which optimizes the interlocking mechanism, can accurately determine the position of the moving contact, and is convenient for the staff to operate.

[0004] The embodiments of the present application are implemented as follows:

[0005] In a first aspect, the embodiments of the present application provide an interlocking mechanism, comprising a knob, an interlocking piece and a driving piece; the knob is rotationally installed on a fixed support and is used for switching between an isolation position and a non-isolation position; the interlocking piece is connected with the fixed support through a sliding guide assembly; the driving piece is linked with a rotating shaft of a moving contact; a driving part is arranged on one side of the driving piece close to the interlocking piece, and a trigger part is arranged on the interlocking piece and abuts against the driving part; the moving contact moves towards a closing direction and drives the driving piece to rotate, the driving part pushes the interlocking piece to move along a sliding path through the trigger part, so that the interlocking piece abuts against the knob, and an acting force that blocks the rotation of the knob to the isolation position is generated.

[0006] As an optional implementation, an elastic element is arranged on the fixed support and connected with the interlocking piece, and the elastic element generates an elastic force that makes the interlocking piece move along the sliding path; the moving contact moves towards an opening direction and drives the driving piece to rotate, and the elastic force makes the interlocking piece disengage from the knob.

[0007] As an optional implementation, the driving piece comprises a driving piece rotating shaft; the axis of the driving piece rotating shaft, the rotating shaft and the extension direction of the sliding path of the interlocking piece are consistent; a sector gear is arranged on the driving piece rotating shaft, and the sector gear is engaged with the rotating shaft for transmission.

[0008] As an optional implementation, the driving member is provided with an integral fan-shaped identification structure for indicating the state of the switch.

[0009] As an optional implementation, the driving part is a guide slope, and is arranged on the side of the fan-shaped identification structure close to the interlocking member; the guide slope gradually decreases from the middle to both sides to the distance to the knob.

[0010] As an optional implementation, the fan-shaped identification structure is provided with an arc-shaped identification surface, and the arc-shaped identification surface is provided with a first closed position identification structure, a double split position identification structure and a second closed position identification structure arranged in sequence around the axis of the rotation shaft of the driving member.

[0011] As an optional implementation, the fixed support is provided with a visible window located on the rotation path of the driving member, and any one of the first closed position identification structure, the double split position identification structure and the second closed position identification structure can be leaked out of the visible window.

[0012] As an optional implementation, the fan-shaped identification structure and the fan-shaped gear are arranged on both sides of the extension direction of the rotation shaft of the driving member.

[0013] As an optional implementation, the fixed support is provided with a guide groove, and the sliding guide assembly includes a sliding part arranged on both sides of the interlocking member; the sliding part can slide along the guide groove.

[0014] As an optional implementation, the guide groove is provided with a buckle, and the buckle abuts against the sliding part to generate a force to block the sliding part from escaping from the guide groove.

[0015] As an optional implementation, the knob is provided with an interlocking part, and the driving member is provided with a limiting part close to the knob; the interlocking part and the limiting part are matched to realize locking or unlocking of the knob.

[0016] In a second aspect, the embodiments of the present application provide an automatic transfer switch, including a fixed support, a movable contact and the above interlocking mechanism; the movable contact has a rotation shaft, and the rotation shaft is linked with the driving member; the fixed support includes a mask covering the interlocking mechanism, and the mask is provided with a state identification arranged circumferentially around the knob.

[0017] The beneficial effects of the embodiments of the present application include:

[0018] The embodiment of the present application provides a locking mechanism, which comprises a knob, a locking piece and a driving piece; the knob is rotatably installed on a fixed support and is used for switching between an isolation position and a non-isolation position. The locking piece of the embodiment of the present application is connected with the fixed support through a sliding guide assembly; the driving piece is rotatably arranged in the fixed support and is linked with the rotating shaft of a movable contact, so that the movable contact drives the driving piece to rotate in the process of opening and closing, and the rotating shaft of the driving piece of the embodiment of the present application is consistent with the sliding path of the locking piece. The driving part is arranged on the side of the driving piece close to the locking piece, and the locking piece is provided with a trigger part abutting against the driving part; the movable contact moves towards the closing direction and drives the driving piece to rotate, the driving part pushes the locking piece to move along the sliding path and close to the knob through the trigger part, so that the locking piece abuts against the knob, and an acting force of blocking the rotation of the knob to the isolation position is generated. The embodiment of the present application directly drives the locking piece to lock or not to lock the knob through the rotation of the driving piece, compared with the prior art, the number of parts is less, the limiting can be more accurate, and the locking mechanism is not easy to jam, so that the staff can operate conveniently. In addition, the driving piece is driven to move by the movable contact, and the position of the driving piece can directly reflect the position of the movable contact, so that the staff can accurately judge the position of the movable contact.

[0019] The embodiment of the present application provides an automatic transfer switch, which comprises a fixed support, a movable contact and the above-mentioned locking mechanism; the movable contact has a rotating shaft, and the rotating shaft is linked with the driving piece; the fixed support comprises a mask covering the locking mechanism, and the mask is provided with state marks arranged in the circumferential direction of the knob. The automatic transfer switch of the embodiment of the present application adopts the above-mentioned locking mechanism, so that the automatic transfer switch of the embodiment of the present application not only can accurately judge the position of the movable contact, but also is convenient for the staff to operate. The mask is arranged on the fixed support, so that the above-mentioned locking mechanism can be protected, the position of the knob can be clearly indicated through the state marks, and the staff can conveniently perform switching operation. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 It is a structure schematic view of the locking mechanism of the embodiment of the present application;

[0022] Figure 2 It is a structure schematic view of the driving piece of the locking mechanism of the embodiment of the present application;

[0023] Figure 3Structure diagram of the interlocking part of the interlocking mechanism of the embodiment of the present application;

[0024] Figure 4 Structure diagram of the interlocking mechanism of the embodiment of the present application;

[0025] Figure 5 Structure diagram of the driving part of the interlocking mechanism of the embodiment of the present application in the double split position;

[0026] Figure 6 Structure diagram of the driving part of the interlocking mechanism of the embodiment of the present application in the second closed position;

[0027] Figure 7 Structure diagram of the driving part of the interlocking mechanism of the embodiment of the present application in the first closed position;

[0028] Figure 8 Structure diagram of the face cover of the automatic transfer switch of the embodiment of the present application.

[0029] Icon:

[0030] 100 - knob; 101 - interlocking part; 102 - driving part; 103 - fixed support; 104 - sliding guide assembly; 105 - movable contact; 106 - rotating shaft; 107 - driving part; 108 - triggering part; 109 - elastic element; 110 - driving part rotating shaft; 111 - fan-shaped identification structure; 112 - fan-shaped gear; 113 - arc-shaped identification surface; 114 - first closed position identification structure; 115 - double split position identification structure; 116 - second closed position identification structure; 117 - sliding part; 118 - buckle; 119 - face cover; 120 - limiting part; 121 - interlocking part. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0033] It should be noted that similar reference numerals and letters refer to like items throughout the accompanying drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in subsequent drawings. In addition, the terms "first", "second", "third" and the like are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0035] The dual power automatic transfer switch is widely used in emergency power supply system. In order to ensure the reliable operation of the load, it is usually necessary to periodically cut off the power to maintain the electrical equipment. In order to prevent misoperation of the staff during maintenance, it is necessary to set a padlock on the automatic transfer switch to ensure that the power supply end and the load end are reliably isolated, and to ensure that the maintenance personnel can maintain the electrical equipment in a safe environment. When the padlock is cancelled, the switch can be automatically or manually switched to the closing position of the normal power supply or the standby power supply. In order to realize the above functions, the current mechanism has many parts, and the required operating force is large, which is not convenient for the staff to operate. In addition, the existing mechanism is prone to jamming, and the position of the moving contact 105 cannot be accurately judged in the jamming.

[0036] To solve the above technical problems, the embodiments of the present application provide a interlocking mechanism and an automatic transfer switch.

[0037] Reference Figure 1 , Figure 2 and Figure 3As shown, the embodiment of the application provides a interlocking mechanism, comprising a knob 100, an interlocking piece 101 and a driving piece 102; the knob 100 is rotatably installed on a fixed support 103, and is used for switching between an isolation position and a non-isolation position; the interlocking piece 101 is connected with the fixed support 103 through a sliding guide assembly 104; the driving piece 102 is rotatably arranged in the fixed support 103, and is linked with a rotating shaft 106 of a movable contact 105; the rotating shaft 106 of the driving piece 102 is consistent with a sliding path of the interlocking piece 101; a driving part 107 is arranged on a side of the driving piece 102 close to the interlocking piece 101, and a trigger part 108 abutting against the driving part 107 is arranged on the interlocking piece 101; the movable contact 105 moves towards a closing direction and drives the driving piece 102 to rotate, the driving part 107 pushes the interlocking piece 101 to move along the sliding path and close to the knob 100 through the trigger part 108, so that the interlocking piece 101 abuts against the knob 100, and an acting force of blocking the knob 100 from rotating to the isolation position is generated.

[0038] The embodiment of the application provides a interlocking mechanism, comprising a knob 100, an interlocking piece 101 and a driving piece 102; the knob 100 is rotatably installed on a fixed support 103, and is used for switching between an isolation position and a non-isolation position.

[0039] It should be noted that the staff can rotate the knob 100, so that the knob 100 is switched from the isolation position to the non-isolation position. When the knob 100 is located in the isolation position, the automatic transfer switch is provided with a padlock, so that the power supply end and the load end are tripped to achieve reliable isolation. When the knob 100 is rotated to the non-isolation position and the padlock is cancelled, the switch can be switched to the closing position of the normal power supply or the standby power supply in the automatic mode or the manual mode. Therefore, the above-mentioned non-isolation position includes the automatic mode and the manual mode.

[0040] The interlocking piece 101 of the embodiment of the application is connected with the fixed support 103 through the sliding guide assembly 104; the driving piece 102 is rotatably arranged in the fixed support 103, and is linked with the rotating shaft 106 of the movable contact 105, so that the movable contact 105 drives the driving piece 102 to rotate in the opening and closing process, and the rotating shaft 106 of the driving piece 102 is consistent with the sliding path of the interlocking piece 101.

[0041] It should be noted that one end of the guide path of the sliding guide assembly 104 extends towards the direction close to the knob 100, and the other end extends towards the direction close to the driving piece 102. The interlocking piece 101 can move close to or away from the knob 100 through the sliding guide assembly 104. Referring to Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, by the limiting portion 120 arranged on the interlocking piece 101, the interlocking portion 121 arranged on the knob 100, when the interlocking piece 101 is driven to approach the knob 100, the limiting portion 120 can abut against the interlocking portion 121, thereby blocking the rotation of the knob 100, and the knob 100 cannot be switched to the isolation position.

[0042] Referring to Figure 2 and Figure 3 As shown, the driving portion 107 is arranged on the driving piece 102 on the side close to the interlocking piece 101, and the trigger portion 108 is arranged on the interlocking piece 101 and abuts against the driving portion 107; the moving contact 105 moves towards the closing direction and drives the driving piece 102 to rotate, the driving portion 107 pushes the interlocking piece 101 along the sliding path to approach the knob 100 through the trigger portion 108, so that the interlocking piece 101 abuts against the knob 100, and an acting force is generated to block the rotation of the knob 100 to the isolation position.

[0043] It should be noted that the movement of the moving contact 105 towards the closing direction includes the movement towards the closing position of the main power supply and the movement towards the closing position of the standby power supply. Therefore, the moving contact 105 has three positions in total, which are the closing position of the main power supply, the split position and the closing position of the standby power supply. Therefore, the driving piece 102 is provided with corresponding three indicating marks, and the split position is located between the closing position of the main power supply and the closing position of the standby power supply.

[0044] It should be noted that no matter whether the rotation shaft of the moving contact 105 drives the driving piece 102 from the split position to the closing position of the main power supply or from the split position to the closing position of the standby power supply, the driving portion 107 can push the interlocking piece 101 along the sliding path to approach the knob 100 through the trigger portion 108, so that the interlocking piece 101 abuts against the knob 100, and an acting force is generated to block the rotation of the knob 100 to the isolation position.

[0045] The embodiment directly locks or does not lock the knob 100 through the rotation of the driving piece 102, compared with the prior art, the number of parts is less, the limiting can be more accurate, and it is not easy to be stuck, which is convenient for the staff to operate. In addition, the driving piece 102 is driven to move by the moving contact 105, and the position of the driving piece 102 can directly reflect the position of the moving contact 105, so that the staff can accurately judge the position of the moving contact 105.

[0046] Referring to Figure 1 As an optional embodiment, the fixed support 103 is provided with an elastic element 109 connected with the interlocking piece 101, and the elastic element 109 generates an elastic force to make the interlocking piece 101 move away from the knob 100 along the sliding path; the moving contact 105 moves towards the opening direction and drives the driving piece 102 to rotate, and the elastic force makes the interlocking piece 101 and the knob 100 abut.

[0047] Further, the embodiment of the application is provided with the elastic element 109 on the interlocking piece 101, when the interlocking piece 101 moves close to the knob 100, the elastic element 109 stretches or compresses the elastic potential energy. When the movable contact 105 moves towards the opening direction, that is, from the normal power closing position to the double opening position and from the standby power closing position to the double opening position, the elastic force of the elastic element 109 will drive the interlocking piece 101 to move along the sliding path away from the knob 100, when the switch is in the double opening position, the limiting of the interlocking piece 101 to the knob 100 is released, at this time the knob 100 can be rotated to the isolation position, so that the switch is in the padlock mode, please refer to Figure 4 、 Figure 5 for details.

[0048] As an optional embodiment, please refer to Figure 2 , the driving piece 102 includes the driving piece shaft 110 and the fan-shaped identification structure 111 provided on the driving piece shaft 110; the axis of the driving piece shaft 110 is consistent with the axis of the rotating shaft 106, the driving piece shaft 110 is provided with the fan-shaped gear 112, and the fan-shaped gear 112 is engaged with the rotating shaft 106 for transmission.

[0049] It should be noted that the rotating shaft 106 is provided with a transmission gear, or a circle of transmission teeth is directly formed on the rotating shaft 106, and the fan-shaped gear 112 is driven to rotate through the engagement with the transmission gear or the transmission teeth.

[0050] Among them, the fan-shaped identification structure 111 and the fan-shaped gear 112 are arranged on both sides of the extension direction of the driving piece shaft 110.

[0051] For example, the fan-shaped identification structure 111 and the fan-shaped gear 112 are symmetrically arranged about the driving piece shaft 110.

[0052] It should be noted that the fan-shaped identification structure 111 and the fan-shaped gear 112 can be coplanar, or can be provided with a spacing in the extension direction of the driving piece shaft 110, so as to facilitate assembly.

[0053] It should be noted that the fan-shaped gear 112 and the driving piece shaft 110 of the embodiment of the application can be integrally formed, or can be provided as two structural members. That is, the driving piece 102 and the fan-shaped gear 112 can be formed as one structural member, or can be provided as two structural members, when provided as two structural members, the fan-shaped gear 112 is connected with the driving piece shaft 110.

[0054] Among them, the fan-shaped identification structure 111 and the driving piece 102 are integrally formed.

[0055] For example, the fan-shaped identification structure 111 and the fan-shaped gear 112 are symmetrically arranged about the driving piece shaft 110. Figure 2As shown, in an optional embodiment, the drive unit 107 includes a guide ramp, and the guide ramp is disposed on the side of the fan-shaped marking structure 111 near the interlocking member 101; the distance of the guide ramp from the middle to both sides to the knob 100 gradually decreases.

[0056] It should be noted that in this embodiment of the application, a guide slope is provided on the side of the fan-shaped marking structure 111 near the interlocking member 101. When the fan-shaped marking structure 111 rotates, the trigger part 108 can slide on the guide slope. During the sliding process, the distance from the contact part of the trigger part 108 and the guide slope to the center of the knob 100 will change, thereby realizing the driving of the interlocking member 101.

[0057] The trigger part 108 is a protruding structure.

[0058] Reference Figure 2 as well as Figure 6 As shown, as an optional implementation, the fan-shaped marking structure 111 has an arc-shaped marking surface 113, and the arc-shaped marking surface 113 is provided with a first closing position marking structure 114, a double opening position marking structure 115 and a second closing position marking structure 116 arranged sequentially around the axis of the drive shaft 110.

[0059] The fixed bracket 103 is provided with a viewing window located on the rotation path of the drive component 102. Any one of the first closing position marking structure 114, the double opening position marking structure 115, and the second closing position marking structure 116 can be shown in the viewing window.

[0060] Reference Figure 3 As shown, in one optional embodiment, the fixed bracket 103 is provided with a guide groove, and the sliding guide assembly 104 includes sliding portions 117 provided on both sides of the interlocking member 101; the sliding portions 117 can slide along the guide groove.

[0061] Among them, reference Figure 1 As shown, a buckle 118 is provided on the guide groove. The buckle 118 abuts against the sliding part 117, generating a force that prevents the sliding part 117 from dislodging from the guide groove.

[0062] It should be noted that, in this embodiment, the snap-fit ​​118 prevents the interlocking member 101 from dislodging from the guide groove, ensuring that the interlocking member 101 can move stably within the guide groove. Furthermore, in this embodiment, the sliding portion 117 is disposed on both sides of the interlocking member 101, which helps to improve the stability of the movement of the interlocking member 101.

[0063] This application provides an automatic transfer switch, including a fixed bracket 103, a moving contact 105, and the aforementioned interlocking mechanism; the moving contact 105 has a rotating shaft 106, which is linked to a driving member 102. (Refer to...) Figure 8As shown, the fixed support 103 comprises a cover 119 covering the interlocking mechanism, and the cover 119 is provided with a state identifier arranged circumferentially around the knob 100.

[0064] The automatic transfer switch of the embodiment of the present application adopts the above interlocking mechanism, so that the automatic transfer switch of the embodiment of the present application can not only accurately determine the position of the movable contact 105, but also facilitate the operation of the staff. The embodiment of the present application sets the cover 119 on the fixed support 103, which can not only protect the above interlocking mechanism, but also clearly indicate the position of the knob 100 through the state identifier, so as to facilitate the switching operation of the staff.

[0065] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A chain mechanism characterized by, The utility model relates to a kind of rotary switch, including knob (100), interlocking piece (101) and driving piece (102);The knob (100) is rotatably installed on fixed support (103), for switching between isolated position and non-isolated position;Interlocking piece (101) is connected with fixed support (103) by sliding guide assembly (104);Driving piece (102) is linked with the rotating shaft (106) of movable contact (105);Driving piece (102) is provided with driving portion (107) on the side close to interlocking piece (101), and interlocking piece (101) is equipped with trigger portion (108) with driving portion (107) abutment;Movable contact (105) moves towards closing direction and drives driving piece (102) to rotate, and driving portion (107) pushes interlocking piece (101) along sliding path by trigger portion (108) movement, so that interlocking piece (101) is abutted with knob (100), and the force that rotates knob (100) to isolated position is generated.

2. The interlocking mechanism of claim 1, wherein, Fixed support (103) is equipped with elastic element (109) connected with interlocking piece (101), and the elastic force that makes interlocking piece (101) move along sliding path is generated;Movable contact (105) moves towards opening direction and drives driving piece (102) to rotate, and elastic force makes interlocking piece (101) and knob (100) remove abutment.

3. A chain mechanism according to claim 1 or 2, characterised in that Driving piece (102) includes driving piece rotating shaft (110);The axis of driving piece rotating shaft (110), the axis of rotating shaft (106) and the extension direction of interlocking piece (101) sliding path are consistent, and sector gear (112) is equipped on driving piece rotating shaft (110), and sector gear (112) is engaged with rotating shaft (106) transmission.

4. The interlocking mechanism of claim 3, wherein, Driving piece (102) has sector identification structure (111) on it, for the state indication of change-over switch.

5. The interlock mechanism of claim 4, wherein, Driving portion (107) is guide slope, and is arranged on the side of sector identification structure (111) close to interlocking piece (101);The distance of guide slope from middle to both sides to knob (100) gradually reduces.

6. The interlock mechanism of claim 4, wherein, Sector identification structure (111) and sector gear (112) are arranged on both sides of driving piece rotating shaft (110) extension direction.

7. The interlocking mechanism according to claim 1 or 2, wherein Fixed support (103) is provided with guide groove, and sliding guide assembly (104) includes sliding portion (117) arranged on both sides of interlocking piece (101);Sliding portion (117) can slide along guide groove.

8. The interlocking mechanism of claim 7, wherein, Clasp (118) is arranged on guide groove, and clasp (118) is abutted with sliding portion (117), and the force that blocks sliding portion (117) from getting out of guide groove is generated.

9. The interlocking mechanism of claim 1 or 2, wherein, Knob (100) is provided with interlocking portion (121), and driving piece (102) is equipped with limiting portion (120) on the side close to knob;Interlocking portion (121) cooperates with limiting portion (120) to realize the locking or unlocking of knob (100).

10. An automatic transfer switch characterized by comprising: The device comprises a fixed support (103), a movable contact (105) and a interlocking mechanism as claimed in any one of claims 1-9; the movable contact (105) has a rotating shaft (106) linked with the driving member (102); the fixed support (103) comprises a cover (119) covering the interlocking mechanism, and the cover (119) is provided with a state identifier arranged circumferentially around the knob (100).

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