Multi-gear adjusting rotary switch

Abstract

The invention discloses a multi-gear adjusting rotary switch, which comprises a base, a shell cover, a rotary handle and a contact assembly, and is characterized in that the rotary handle is rotationally arranged between the base and the shell cover and is provided with a driving rod extending along the radial direction of the rotary handle; the contact assembly comprises a plurality of moving contact bridges which are annularly arranged in the mounting cavity with the axis of the rotating handle as the center and are of elastic structures, and a plurality of static contact pieces which are arranged on the base and are opposite to the plurality of moving contact bridges, and the plurality of moving contact bridges are connected and are located on the moving path of the driving rod. According to the technical scheme, the driving rod drives the multiple movable contact bridges to make contact with the multiple static contact pieces in the process of rotating along with the rotating handle, operation pressure is remarkably dispersed through an in-turn contact mechanism formed by the driving rod and the multiple movable contact bridges, continuous stress of a single movable contact bridge is avoided, the mechanical load and the fatigue degree of the movable contact bridges are greatly reduced, and the service life of the movable contact bridges is prolonged. The heating probability is reduced, abrasion and fusion welding risks are reduced, and the mechanical service life is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of switches, and in particular to a multi-speed regulating rotary switch. Background Art

[0002] A rotary switch is a product used in AC power appliances to implement multi-speed function control. Existing Chinese patent document CN117174522A discloses a rotary switch comprising a switch body and a rotary handle rotatably mounted on the switch body. The switch body comprises a cover plate and a base. The cover plate and the base enclose a mounting cavity. The base is provided with a plurality of first terminals circumferentially spaced around the rotary handle. A mating piece is provided on the side of the cover plate facing the base. The mating piece has tooth blocks and tooth grooves staggered around the rotary handle. A locking block of the rotary handle located in the mounting cavity is fixed with an elastic contact bridge. A slider that can contact the tooth blocks and tooth grooves is fixed on the elastic contact bridge. The slider is usually a metal block fixed to the contact bridge by riveting or welding. The elastic contact bridge rotates with the rotary handle and slides along the tooth blocks and the tooth grooves in turn. During this process, the elastic contact bridge is in contact and connected with the first terminal when it is squeezed against the tooth block, and is separated and disconnected from the first terminal when it is against the tooth groove. As can be seen from the above structure, the existing rotary switch still has the following problems in actual use: 1. The single elastic contact bridge is always in contact or switching state during the rotation of the rotary handle. Since the contact bridge is always under force, it causes heating, continuous wear and even welding of the contacts under frequent operation, resulting in a decrease in the electrical contact reliability of the elastic contact bridge, prone to arcing or poor contact, and shortened mechanical life; 2. The slider is always elastically pressed against the tooth block and tooth groove, and slides along the surface of the tooth block and tooth groove when the rotary handle rotates, causing rapid wear, affecting the contact pressure between the contact bridge and the first terminal, and thus reducing electrical reliability. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that a single contact bridge is always in contact or switching state during the rotation of the operating lever, causing the contacts to heat up, continuously wear or even weld under frequent operation, resulting in a decrease in the electrical contact reliability of the contact bridge and a shortened mechanical life, thereby providing a multi-speed adjustable rotary switch that reduces the mechanical load and fatigue of the moving contact bridge, extends the mechanical life and improves electrical reliability.

[0004] To solve the above technical problems, the present invention provides a multi-speed adjustable rotary switch, comprising a base, a housing cover, a rotating assembly, and a contact assembly. The base and the housing cover are assembled to form a mounting cavity suitable for accommodating the contact assembly and the rotating assembly. The rotating assembly includes a rotating handle rotatably disposed between the base and the housing cover, and the rotating handle is provided with a drive rod extending radially thereof.

[0005] The contact assembly includes a plurality of elastically structured movable contact bridges arranged in a ring shape in the mounting cavity with the axis of the rotating handle as the center, and a plurality of stationary contact pieces arranged on the base and respectively opposite to the plurality of movable contact bridges. The plurality of movable contact bridges are connected to each other and are respectively located on the movement path of the driving rod. The driving rod drives the plurality of movable contact bridges to contact the plurality of stationary contact pieces respectively during the rotation of the rotating handle, and any movable contact bridge recovers its deformation and separates from the stationary contact piece after losing contact with the driving rod.

[0006] As a preferred solution, multiple dynamic contact bridges are connected by a connecting ring and are distributed circumferentially around the connecting ring. The connecting ring and the rotating handle are coaxially arranged in the installation cavity and fixed between the lower end of the rotating handle and the base.

[0007] As a preferred solution, one end of the plurality of moving contact bridges is integrally connected to the coupling ring, and the other ends of the plurality of moving contact bridges are provided with contacts and are inclinedly extended and raised toward the direction of the plurality of static contact pieces.

[0008] As a preferred solution, the base has a positioning boss extending axially along the rotating handle, the lower end of the rotating handle is provided with a positioning recessed hole rotatably connected to the positioning boss, and the connecting ring is sleeved on the positioning boss and fixed between the positioning boss and the rotating handle.

[0009] As a preferred solution, multiple moving contact bridges are arranged in a ring-shaped manner on the outer peripheral side of the connecting ring, and two adjacent moving contact bridges are arranged at an angle to each other; the connecting ring is provided with a first pin extending from the bottom of the base, and multiple static contact pieces respectively have multiple second pins extending from the bottom of the base.

[0010] As a preferred solution, a corrugated bending reinforcement portion is provided between the moving contact bridge and the coupling ring.

[0011] As a preferred solution, the driving rod is integrally formed on the side wall of the rotating handle, and an arc protrusion for pressing and contacting the moving contact bridge is provided at one end of the driving rod away from the rotating handle.

[0012] As a preferred solution, a guide structure is provided between the multiple moving contact bridges to guide the driving rod to switch movement between the multiple moving contact bridges. The guide structure includes multiple groups of guide fins that are respectively obliquely arranged on the side edges of the multiple moving contact bridges, and the multiple groups of guide fins are respectively located on the movement path of the driving rod.

[0013] As a preferred embodiment, the rotating assembly includes a gear structure arranged between the rotating handle and the shell cover, and the gear structure includes: a limiting hole extending radially along the rotating handle and arranged on the side wall of the rotating handle, and a gear ball and a gear spring arranged in the limiting hole, and an annular boss arranged inside the shell cover around the rotating handle, and a plurality of gear teeth are arranged on the inner wall of the annular boss at intervals along the circumferential direction. The gear ball is positioned and abutted against one of the gear teeth under the action of the gear spring, and switches between the plurality of gear teeth when the rotating handle rotates.

[0014] As a preferred solution, a threaded joint is provided on the top of the shell cover, and the threaded joint has a center hole extending along the axial direction of the rotating handle and connected to the installation cavity. The rotating handle has an operating end extending out of the top of the shell cover through the center hole, and the shell cover and the base are installed and connected by a snap-fit ​​structure.

[0015] The technical solution of the present invention has the following advantages over the prior art:

[0016] 1. In the multi-speed adjustment rotary switch provided by the present invention, a driving rod is introduced as an intermediate transmission structure between the rotating handle and multiple elastic moving contact bridges, and multiple elastic moving contact bridges are arranged in the installation cavity at intervals along the circumferential direction and are respectively located on the movement path of the driving rod. When the rotating handle rotates, the driving rod drives different moving contact bridges to contact with the static contact pieces in turn, so that each moving contact bridge is only subjected to force at a specific gear position and is in a separated state at other times. The design of this technical solution significantly disperses the operating pressure through the mechanism of alternating contact formed by the driving rod and multiple moving contact bridges, avoids continuous force on a single moving contact bridge, greatly reduces the mechanical load and fatigue of the moving contact bridge, and extends the mechanical life of the moving contact bridge, thereby reducing the probability of heat generation, reducing the risk of wear and welding, and improving electrical reliability. The mechanical operating life of the overall switch is significantly extended, and it is suitable for application scenarios that require frequent gear switching.

[0017] 2. In the multi-speed adjustable rotary switch provided by the present invention, multiple moving contact bridges are electrically connected to each other through a connecting ring. According to the coaxial arrangement of the connecting ring and the rotating handle, the multiple moving contact bridges are radially or annularly distributed with the axis of the rotating handle as the center, and when the driving rod rotates around the same axis, it can press on the multiple moving contact bridges respectively, thereby driving the multiple moving contact bridges to contact the multiple static contact pieces respectively to conduct the circuit, thereby realizing multi-loop control. This design can avoid the continuous force on a single moving contact bridge and the oxidation caused by long-term power-on through the alternating contact between the driving rod and the multiple moving contact bridges. The number of contacts with the driving rod can be shared by the multiple moving contact bridges, thereby reducing the current-carrying pressure of a single moving contact bridge and reducing heat, which is conducive to reducing arc generation, improving the electrical reliability of the product and extending the mechanical and electrical life.

[0018] 3. In the multi-speed adjustment rotary switch provided by the present invention, the rotating handle and the base are matched with the positioning boss and the positioning recessed hole through the shaft hole, which plays a role in positioning and rotating the rotating handle. The connecting ring is sleeved on the positioning boss and is limited between the rotating handle and the positioning boss, so that the multiple moving contact bridges connected to the connecting ring are strictly distributed with the axis of the rotating handle as the center of the circle. This design not only plays a rigid support role for the connecting ring and the multiple moving contact bridges, but also ensures that the multiple moving contact bridges are evenly distributed circumferentially, thereby realizing the advantages of high-precision coaxial transmission, low-wear contact, and easy assembly and maintenance of the rotary switch.

[0019] 4. In the multi-speed adjustment rotary switch provided by the present invention, an arc protrusion is provided at the end of the driving rod away from the rotating handle to press against the moving contact bridge, and multiple groups of guide fins are provided on the side edges of multiple moving contact bridges. The advantage of this design is that when the driving rod rotates and needs to contact the next moving contact bridge, the arc surface of the arc protrusion will first contact the inclined guide fins on the side of the target moving contact bridge. The contact between the arc protrusion and the inclined guide fin is gradual and sliding, which is also conducive to dispersing contact stress. This greatly reduces the impact resistance and friction resistance of the driving rod when cutting into the next moving contact bridge, making the switching action smoother and more labor-saving, reducing the torque required to be applied by the operator, and improving the hand feel, so that the driving rod can be accurately guided into the driving position of the moving contact bridge, preventing jamming or dislocation, and improving the reliability of electrical connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the planar structure of the multi-speed adjustment rotary switch provided by the invention;

[0022] Figure 2 A schematic cross-sectional view of the multi-speed adjustment rotary switch provided by the invention;

[0023] Figure 3 A schematic diagram of the internal structure of the invented multi-speed adjustment rotary switch;

[0024] Figure 4 A schematic structural diagram of the gear structure of the invention;

[0025] Figure 5 Schematic diagram of the structure of the invented moving contact bridge.

[0026] Description of the drawings: 1. Base; 11. Positioning boss; 12. Threaded joint; 2. Shell cover; 3. Rotating handle; 31. Positioning recess; 4. Drive rod; 41. Arc protrusion; 5. Moving contact bridge; 51. Bent reinforcement; 52. Guide fin; 53. First pin; 6. Stationary contact; 61. Second pin; 7. Connecting ring; 81. Gear ball; 82. Gear spring; 83. Annular boss; 84. Gear tooth groove. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example

[0031] The present invention provides Figure 1-5 The multi-speed adjustable rotary switch shown in the figure includes a base 1, a housing cover 2, a rotating assembly, and a contact assembly. The base 1 and the housing cover 2 are assembled to form a mounting cavity suitable for accommodating the contact assembly and the rotating assembly. The rotating assembly includes a rotating handle 3 rotatably disposed between the base 1 and the housing cover 2. The rotating handle 3 is provided with a drive rod 4 extending radially therefrom.

[0032] The contact assembly includes a plurality of elastically structured movable contact bridges 5 arranged in a ring shape in the mounting cavity with the axis of the rotating handle 3 as the center, and a plurality of static contact pieces 6 arranged on the base 1 and respectively opposite to the plurality of movable contact bridges 5. The plurality of movable contact bridges 5 are connected to each other and are respectively located on the movement path of the driving rod 4. The driving rod 4 drives the plurality of movable contact bridges 5 to contact the plurality of static contact pieces 6 respectively during the rotation of the rotating handle 3. Such movable contact bridges 5 are elastically offset toward the side of the static contact piece 6 when driven and pressed by the driving rod 4. Therefore, any movable contact bridge 5 recovers its deformation and separates from the static contact piece 6 after being out of contact with the driving rod 4.

[0033] The above implementation mode is the core technical solution of this embodiment. By introducing the driving rod 4 as the intermediate transmission structure between the rotating handle 3 and multiple elastic moving contact bridges 5, multiple elastic moving contact bridges 5 are arranged in the installation cavity along the circumferential direction and are respectively located on the movement path of the driving rod 4. When the rotating handle 3 rotates, the driving rod 4 drives different moving contact bridges 5 to contact the static contact piece 6 in turn, so that each moving contact bridge 5 is only subjected to force at a specific gear position, and is in a separated state at the rest of the time. The design of this technical solution significantly disperses the operating pressure through the mechanism of alternating contact formed by the driving rod 4 and multiple moving contact bridges 5, avoids continuous force on a single moving contact bridge, greatly reduces the mechanical load and fatigue of the moving contact bridge 5, and extends the mechanical life of the moving contact bridge 5, thereby reducing the probability of heat generation, reducing wear and welding risks, and improving electrical reliability. The mechanical operating life of the overall switch is significantly extended, which is suitable for application scenarios that require frequent gear switching.

[0034] The following combination Figure 2-5 The specific arrangement of the multiple moving contact bridges 5 is described in detail:

[0035] Multiple moving contact bridges 5 are connected by a connecting ring 7 and are distributed circumferentially around the connecting ring. The connecting ring 7 and the rotating handle 3 are coaxially arranged in the installation cavity and fixed between the lower end of the rotating handle and the base. Specifically, one end of the multiple moving contact bridges 5 is integrally connected to the connecting ring, and the other end of the multiple moving contact bridges 5 is provided with contacts and is respectively extended and tilted toward the direction of the multiple static contact pieces 6. In this way, the multiple moving contact bridges 5 and the multiple static contact pieces 6 are arranged opposite to each other in the installation cavity. With this structural arrangement, the multiple moving contact bridges 5 are electrically connected to each other through the connecting ring 7. According to the coaxial arrangement of the connecting ring 7 and the rotating handle, the multiple moving contact bridges 5 are radially or annularly distributed with the axis of the rotating handle as the center, so that when the driving rod 4 rotates around the same axis, it can press on the multiple moving contact bridges 5 respectively, thereby driving the multiple moving contact bridges 5 to contact the multiple static contact pieces 6 respectively to conduct the circuit, thereby realizing multi-circuit control, realizing reliable control of multiple contacts in a compact space, and taking into account both mechanical transmission efficiency and electrical performance. Compared with the existing technology, this technical solution is designed to avoid the continuous force on a single moving contact bridge 5 and the oxidation caused by long-term power-on by alternating contact between the driving rod 4 and multiple moving contact bridges 5. The multiple moving contact bridges 5 can share the number of contacts with the driving rod 4, reduce the current-carrying pressure of a single moving contact bridge 5, reduce heat, and help reduce arc generation, thereby improving the electrical reliability and mechanical electrical life of the product.

[0036] It is further preferred that a plurality of moving contact bridges 5 are arranged at annular intervals on the outer peripheral side of the connecting ring 7, and two adjacent moving contact bridges 5 are arranged at angles to each other, the connecting ring 7 is provided with a first pin 53 extending from the bottom of the base 1, and a plurality of static contact pieces 6 respectively have a plurality of second pins 61 extending from the bottom of the base 1, the first pin 53 and the second pin 61 can be used for external wires respectively, wherein the base 1 has a positioning boss 11 extending axially along the rotating handle, the lower end of the rotating handle 3 is provided with a positioning recessed hole 31 rotatably connected to the positioning boss 11, and the connecting ring 7 is sleeved on the positioning boss 11 and is fixed between the positioning boss 11 and the rotating handle. This structural setting uses the axial hole cooperation between the positioning boss 11 and the positioning recessed hole 31 to position and rotate the rotating handle 3. The connecting ring 7 is pressed and limited by the rotating handle 3 and fixed on the positioning boss 11, so that the multiple moving contact bridges 5 connected to the connecting ring 7 are strictly distributed with the axis of the rotating handle 3 as the center of the circle. This design not only provides rigid support for the connecting ring 7 and the multiple moving contact bridges 5, but also ensures that the multiple moving contact bridges are evenly distributed circumferentially, thereby realizing the advantages of high-precision coaxial transmission, low-wear contact, and easy assembly and maintenance of the rotary switch.

[0037] In order to ensure that the switching action of the driving rod 4 between multiple moving contact bridges is smoother and more labor-saving, as shown in FIG. Figure 2-4As shown, the driving rod 4 is integrally formed on the side wall of the rotating handle, and the end thereof away from the rotating handle 3 is provided with an arc protrusion 41 that presses against the moving contact bridge 5. It is further preferably provided that a guide structure for guiding the driving rod to switch between the multiple moving contact bridges 5 is provided between the multiple moving contact bridges 5, and the guide structure includes a plurality of groups of guide fins 52 that are respectively obliquely arranged on both sides of the multiple moving contact bridges 5, and the plurality of groups of guide fins 52 are respectively located on the movement path of the driving rod 4. The advantage of this design is that when the drive rod 4 rotates and needs to contact the next moving contact bridge 5, the arc surface of the arc protrusion 41 will first contact the inclined guide fin 52 on the side of the target moving contact bridge. The contact between the arc protrusion 41 and the inclined guide fin 52 is gradual and sliding, which is also conducive to dispersing the contact stress. This greatly reduces the impact resistance and friction resistance of the drive rod 4 when cutting into the next moving contact bridge 5, making the switching action smoother and more labor-saving, reducing the torque required by the operator, and improving the feel, so that the drive rod 4 can be accurately guided into the driving position of the moving contact bridge, preventing jamming or dislocation, and improving the reliability of the electrical connection.

[0038] In order to improve the anti-deformation ability of the moving contact bridge 5, Figure 5 As shown, a corrugated-shaped bending reinforcement portion 51 is provided between the moving contact bridge 5 and the connecting ring 7. The bending reinforcement portion 51 is a structural reinforcement design for the elastic moving contact bridge 5 to withstand cyclic stress during frequent driving and resetting. It can improve the structural strength of the moving contact bridge 5 and improve the fatigue life. When the driving rod 4 presses the moving contact bridge 5, the stress is evenly dispersed along the corrugated surface to avoid stress concentration in a single plane, which significantly delays the occurrence of fatigue cracks, improves the fatigue life of the moving contact bridge 5 under long-term cyclic loads, and avoids deformation or even fracture failure due to metal fatigue.

[0039] In this embodiment, the rotating assembly includes a gear structure provided between the rotating handle 3 and the housing cover 2, such as Figure 4As shown, the gear structure includes: a limiting hole extending radially along the rotating handle 3 and arranged on the side wall of the rotating handle 3, and a gear ball 81 and a gear spring 82 arranged in the limiting hole, and an annular boss 83 arranged inside the shell cover 2 around the rotating handle 3, and a plurality of gear tooth grooves 84 are arranged on the inner wall of the annular boss 83 at intervals along the circumferential direction. The gear ball 81 is positioned and abutted against one of the gear tooth grooves 84 under the action of the gear spring 82, and switches between the plurality of gear tooth grooves 84 when the rotating handle 3 rotates. With this structural setting, when the rotary handle 3 is rotated to a specific angle, the gear ball 81 is embedded in the gear tooth groove 84 under the thrust of the spring to achieve rigid positioning. When switching gears, the rotational force causes the ball to roll up along the slope of the current gear tooth groove 84. After passing the tooth top, the ball will quickly fall into the next gear tooth groove 84 under the action of the spring, completing the switching and generating clear feedback. The gear structure achieves precise positioning, clear operating experience and high reliability in the compact space of the rotary switch through the design of mechanical locking and elastic feedback, thereby improving the product performance.

[0040] like Figure 1-2 As shown, a threaded joint 12 is provided at the top of the housing cover 2. The threaded joint 12 has a central hole extending axially along the rotating handle 3 and communicating with the mounting cavity. The rotating handle 3 has an operating end extending through the central hole from the top of the housing cover 2. The housing cover 2 and the base 1 are mounted and connected via a snap-fit ​​structure. The threaded joint 12 allows the housing cover 2 to be quickly assembled with an external device (such as a panel) via threads, eliminating the need for additional fasteners and simplifying the assembly process. The operating lever extends directly to the top of the housing cover 2, allowing the user to rotate the rotating handle 3 with only a small torque, thereby driving the multiple moving contact bridges 5 into contact with the multiple static contact pieces 6 to achieve circuit conduction.

[0041] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A multi-speed adjustable rotary switch, comprising a base (1), a shell cover (2), a rotating assembly and a contact assembly, wherein the base (1) and the shell cover (2) are assembled to form an installation cavity suitable for accommodating the contact assembly and the rotating assembly, and characterized in that: The rotating assembly comprises a rotating handle (3) rotatably arranged between the base (1) and the housing cover (2), wherein the rotating handle (3) is provided with a driving rod (4) extending in its radial direction; The contact assembly comprises a plurality of elastically structured movable contact bridges (5) arranged in a ring shape in the installation cavity with the axis of the rotating handle (3) as the center, and a plurality of stationary contact pieces (6) arranged on the base (1) and respectively opposite to the plurality of movable contact bridges (5). The plurality of movable contact bridges (5) are connected to each other and are respectively located on the movement path of the driving rod (4). The driving rod (4) drives the plurality of movable contact bridges (5) to contact the plurality of stationary contact pieces (6) respectively during the rotation process following the rotating handle (3), and any movable contact bridge (5) recovers its deformation and separates from the stationary contact piece (6) after losing contact with the driving rod (4).

2. The multi-speed adjustable rotary switch according to claim 1, characterized in that: A plurality of moving contact bridges (5) are connected via a connecting ring (7) and are circumferentially spaced around the connecting ring. The connecting ring (7) and the rotating handle (3) are coaxially arranged in the installation cavity and fixed between the lower end of the rotating handle (3) and the base (1).

3. The multi-speed adjustable rotary switch according to claim 2, characterized in that: One end of the plurality of moving contact bridges (5) is integrally connected to the coupling ring, and the other end of the plurality of moving contact bridges (5) is provided with a contact point and is tilted and extended upward in the direction of the plurality of stationary contact pieces (6).

4. The multi-speed adjustable rotary switch according to claim 2, characterized in that: The base (1) has a positioning boss (11) extending axially along the rotating handle, the lower end of the rotating handle (3) is provided with a positioning recessed hole (31) rotatably connected to the positioning boss (11), and the connecting ring (7) is sleeved on the positioning boss (11) and is pressed and fixed between the positioning boss (11) and the rotating handle (3).

5. A multi-speed adjustment rotary switch according to any one of claims 2 to 4, characterized in that: A plurality of movable contact bridges (5) are arranged at intervals on the outer peripheral side of the connecting ring (7), and two adjacent movable contact bridges (5) are arranged at an angle to each other; the connecting ring (7) is provided with a first pin (53) extending from the bottom of the base (1), and the plurality of stationary contact pieces (6) respectively have a plurality of second pins (61) extending from the bottom of the base (1).

6. The multi-speed adjustable rotary switch according to claim 5, characterized in that: A corrugated bending reinforcement portion (51) is provided between the moving contact bridge (5) and the coupling ring (7).

7. The multi-speed adjustable rotary switch according to claim 1, characterized in that: The driving rod (4) is integrally formed on the side wall of the rotating handle, and an arc protrusion (41) is provided at one end thereof away from the rotating handle (3) for pressing against the moving contact bridge (5).

8. The multi-speed adjustment rotary switch according to claim 7, characterized in that: A guide structure for guiding the drive rod to switch between the multiple moving contact bridges (5) is provided between the multiple moving contact bridges (5), and the guide structure comprises multiple groups of guide fins (52) respectively arranged obliquely on the side edges of the multiple moving contact bridges (5), and the multiple groups of guide fins (52) are respectively located on the movement path of the drive rod (4).

9. The multi-speed adjustable rotary switch according to claim 1 or 7, characterized in that: The rotating assembly comprises a shift structure arranged between a rotating handle (3) and a shell cover (2), the shift structure comprising: a limiting hole extending radially along the rotating handle (3) and arranged on the side wall of the rotating handle (3), a shift ball (81) and a shift spring (82) arranged in the limiting hole, and an annular boss (83) arranged inside the shell cover (2) around the rotating handle (3), a plurality of shift tooth grooves (84) arranged at intervals along the circumferential direction on the inner wall of the annular boss (83), the shift ball (81) being positioned and abutted against one of the shift tooth grooves (84) under the action of the shift spring (82), and switching between the plurality of shift tooth grooves (84) as the rotating handle (3) rotates.

10. The multi-speed adjustment rotary switch according to claim 9, characterized in that: A threaded joint (12) is provided on the top of the shell cover (2), and the threaded joint (12) has a central hole extending along the axial direction of the rotating handle (3) and connected to the installation cavity. The rotating handle (3) has an operating end extending out of the top of the shell cover through the central hole. The shell cover (2) and the base (1) are installed and connected via a snap-fit ​​structure.

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