Power switching mechanism

Abstract

The embodiment of the invention provides a power switching mechanism, and relates to the technical field of transmission. The power switching mechanism comprises a first transmission shaft, a second transmission shaft, a third transmission shaft, a first power coupling piece, a second power coupling piece, a power switching assembly and a shell. The first transmission shaft and the second transmission shaft are rotatably installed at the two ends of the shell. The third transmission shaft is rotatably installed on the shell and located between the first transmission shaft and the second transmission shaft, and the two ends of the third transmission shaft are spaced from the first transmission shaft and the second transmission shaft respectively. The first power coupling piece is arranged between the first transmission shaft and the third transmission shaft. The second power coupling piece is arranged between the second transmission shaft and the third transmission shaft. The power switching assembly acts on the first power coupling piece and the second power coupling piece, so that the first power coupling piece is coupled with the first transmission shaft and the third transmission shaft or the second power coupling piece is coupled with the second transmission shaft and the third transmission shaft. The structure is simple, and switching is convenient.

Description

Technical Field

[0001] The present invention relates to the field of transmission technology, and in particular to a power switching mechanism. Background Art

[0002] The power switching mechanism is a device that can automatically or manually switch between two different power sources. It is widely used in various occasions that require redundant power systems or flexible power switching to ensure that when one power source fails or is not suitable for use, it can quickly switch to another power source to ensure the continuous operation of the system.

[0003] The existing power switching structure is generally implemented by two sets of independent electromagnetic clutches, friction clutches or hydraulic clutches, which is cumbersome to operate and not conducive to rapid power switching. Summary of the invention

[0004] The object of the present invention includes providing a power switching mechanism which can simplify the structure of the power switching mechanism and can achieve rapid switching.

[0005] The embodiments of the present invention can be implemented as follows:

[0006] The present invention provides a power switching mechanism, comprising a first transmission shaft, a second transmission shaft, a third transmission shaft, a first power coupling member, a second power coupling member, a power switching assembly and a housing;

[0007] The first transmission shaft and the second transmission shaft are rotatably mounted on both ends of the housing;

[0008] The third transmission shaft is rotatably mounted on the housing and is located between the first transmission shaft and the second transmission shaft, and two ends of the third transmission shaft are spaced apart from the first transmission shaft and the second transmission shaft respectively;

[0009] The first power coupling member is disposed between the first transmission shaft and the third transmission shaft;

[0010] The second power coupling member is disposed between the second transmission shaft and the third transmission shaft;

[0011] The power switching assembly acts on the first power coupling member and the second power coupling member, so that the first power coupling member couples the first transmission shaft and the third transmission shaft or the second power coupling member couples the second transmission shaft and the third transmission shaft.

[0012] In an optional embodiment, the power switching assembly includes an operating lever;

[0013] The first power coupling member is movably disposed between the first transmission shaft and the third transmission shaft;

[0014] The second power coupling member is movably disposed between the second transmission shaft and the third transmission shaft;

[0015] The first transmission shaft is provided with a first through hole, and the third transmission shaft is provided with a second through hole;

[0016] The operating rod is inserted into the first through hole and the second through hole, and one end of the operating rod extends out from the end of the first transmission shaft, and the operating rod can act on the first power coupling member and the second power coupling member;

[0017] The operating rod can drive the first power coupling member and the second power coupling member to move, so that the first power coupling member is coupled to both the first transmission shaft and the third transmission shaft, and the second power coupling member is decoupled from at least one of the second transmission shaft and the third transmission shaft.

[0018] In an optional embodiment, the power switching assembly further includes a first elastic member;

[0019] The first elastic member is disposed between the first power coupling member and the first transmission shaft, and the first elastic member can provide elastic force to the first power coupling member, so that the first power coupling member and the first transmission shaft and the second transmission shaft are kept in a coupled state.

[0020] In an optional embodiment, the first power coupling member is provided with a first interlocking structure and a second interlocking structure;

[0021] The first transmission shaft is provided with a third interlocking structure matched with the first interlocking structure;

[0022] The first power coupling member is movably mounted on the first transmission shaft, and the first engaging structure is engaged with the third engaging structure;

[0023] The first elastic member is a spring, the first elastic member is sleeved on the operating rod, and two ends of the first elastic member act on the first transmission shaft and the first power coupling member respectively;

[0024] The third transmission shaft is provided with a fourth interlocking structure matched with the second interlocking structure;

[0025] The operating rod can drive the first power coupling member to move toward the direction close to the third transmission shaft, so that the second engaging structure can engage with the fourth engaging structure.

[0026] In an optional embodiment, the power switching assembly further includes a second elastic member and a stopper;

[0027] The second power coupling is movably mounted on the second transmission shaft and coupled with the second transmission shaft, and the second power coupling has a first position coupled with both the second transmission shaft and the third transmission shaft and a second position coupled with the second transmission shaft and separated from the third transmission shaft;

[0028] The second elastic member is configured to provide an elastic force to the second power coupling member in a direction toward the third transmission shaft;

[0029] The stopper is arranged on the housing, and when the operating rod drives the second power coupling member to move to the second position, the stopper can abut against the second power coupling member to limit the second power coupling member to the second position;

[0030] The second transmission shaft drives the second power coupling to rotate to release the restriction of the stopper on the second power coupling, so that the second elastic member drives the second power coupling to move toward the first position; the movement of the second power coupling toward the first position can drive the operating rod to move and drive the first power coupling to move, so that the first power coupling is decoupled from at least one of the first transmission shaft or the third transmission shaft.

[0031] In an optional embodiment, an abutment groove is provided on the outer periphery of the second power coupling member, and the abutment groove is provided with a first guide portion;

[0032] The stopper is elastic, one end of which is connected to the housing, and the other end of which extends toward the second power coupling member and can be deformed in the radial direction of the second power coupling member;

[0033] When the second power coupling member moves to the second position, the stopper member can be inserted into the abutment groove under the action of its own elastic force;

[0034] In the case where the stopper is inserted into the abutment groove, when the second power coupling member rotates, the stopper will be guided out of the abutment groove under the action of the first guide portion to release the abutment.

[0035] In an optional embodiment, the abutment groove is an annular groove, which is recessed on the end surface of the second power coupling member and located at the outer periphery of the second power coupling member, and the outer side of the annular groove passes through the outer periphery of the second power coupling member;

[0036] The first guide portion is convexly arranged on the bottom wall of the annular groove, and the outer side of the first guide portion forms a first guide surface;

[0037] One end of the first guide surface is connected to the side wall of the annular groove, and the other end extends outward to the outer peripheral edge of the second power coupling member.

[0038] In an optional embodiment, the bottom wall of the annular groove is further provided with a second guide portion, and the first guide portion and the second guide portion are arranged at intervals in the circumferential direction of the annular groove;

[0039] The side wall of the first guide portion forms a second guide surface, one end of the second guide surface is connected to the side wall of the annular groove, and the other end of the second guide surface extends outward in a counterclockwise direction to the outer periphery of the second power coupling member;

[0040] One end of the first guide surface is connected to the side wall of the annular groove, and the other end extends outward in a clockwise direction to the outer peripheral edge of the second power coupling member.

[0041] In an optional embodiment, the power switching mechanism further includes a pin shaft; a through slide groove is radially provided on the side wall of the second transmission shaft, a third through hole is axially provided on the second power coupling member, and a through pin hole is radially provided; the second power coupling member is movably mounted on the second transmission shaft through the third through hole; the pin shaft is sequentially inserted into the pin hole and the slide groove and can slide along the slide groove, and the end of the operating rod abuts against the pin shaft;

[0042] and / or

[0043] The third transmission shaft is provided with an engaging disk, and a fifth interlocking structure is provided at one end of the engaging disk close to the second transmission shaft. A sixth interlocking structure is provided at one end of the second power coupling close to the third transmission shaft. When the second power coupling is in the first position, the fifth interlocking structure and the sixth interlocking structure are engaged, and when the second power coupling is in the second position, the fifth interlocking structure and the sixth interlocking structure are separated.

[0044] In an optional embodiment, the operating lever includes a first operating lever and a second operating lever;

[0045] The first through hole is provided with an abutment ring;

[0046] The first operating rod is provided with a limiting ring platform, and the first operating rod is inserted into the first through hole from the inner side of the first transmission shaft, and the limiting ring platform and the abutting ring platform cooperate to limit the first operating rod from escaping from the first through hole;

[0047] The second operating rod is inserted into the second through hole, and one end of the second operating rod abuts against the first power coupling component, and the other end acts on the second power coupling component.

[0048] The beneficial effects of the power switching mechanism provided by the embodiment of the present invention include:

[0049] The present application sets a first power coupling between the first transmission shaft and the third transmission shaft, and sets a second power coupling between the second transmission shaft and the third transmission shaft, and enables a power switching component to act on the first power coupling and the second power coupling. The power switching component can be used to simultaneously control the first power coupling and the second power coupling to realize one of the first transmission shaft and the second transmission shaft and the third transmission shaft. The overall structure is simple and can be realized by operating the power switching component, which makes the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic cross-sectional view of the structure of the power switching mechanism provided by an embodiment of the present invention when the third transmission shaft is coupled to the first transmission shaft;

[0052] Figure 2 A schematic cross-sectional view of the structure of the power switching mechanism provided by an embodiment of the present invention when the third transmission shaft is coupled to the second transmission shaft;

[0053] Figure 3 A schematic diagram of the shaft-side structure of a second power coupling member of a power switching mechanism provided in an embodiment of the present invention;

[0054] Figure 4 A schematic diagram of an end projection of a second power coupling member of a power switching mechanism provided in an embodiment of the present invention;

[0055] Figure 5 A schematic side view of a second power coupling member of a power switching mechanism provided in an embodiment of the present invention.

[0056] Icons: 100-power switching mechanism; 110-first transmission shaft; 111-first through hole; 112-installation groove; 120-second transmission shaft; 121-slide groove; 122-first end surface; 123-second end surface; 124-abutment plate; 130-third transmission shaft; 131-second through hole; 132-engaging plate; 133-fifth interlocking structure; 140-first power coupling member; 141-fixing groove; 142-step hole; 150-second power coupling member; 151-annular groove; 152-first guide portion; 153-first guide surface; 154-second guide portion; 155-second guide surface; 1 56-third guide surface; 157-fourth guide surface; 158-first step surface; 159-second step surface; 161-third step surface; 162-third through hole; 163-pin hole; 164-sixth interlocking structure; 170-power switching assembly; 171-operating rod; 172-first elastic member; 173-second elastic member; 174-stop member; 175-first operating rod; 176-second operating rod; 180-housing; 181-cavity; 182-mounting hole; 183-support seat; 184-fixing hole; 185-first end cover; 186-middle shell; 187-second end cover; 190-pin shaft. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0058] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0059] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0060] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0061] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0062] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0063] The overall structure, working principle and technical effects of the power switching device provided by the present invention are described in detail below through embodiments and in conjunction with the accompanying drawings.

[0064] Please refer to Figures 1 to 5 This embodiment provides a power switching mechanism 100, which can be used in power generation equipment to achieve power switching. Of course, the power switching mechanism 100 can also be used in other equipment to achieve power switching.

[0065] In this embodiment, the power switching mechanism 100 includes a first transmission shaft 110, a second transmission shaft 120, a third transmission shaft 130, a first power coupling 140, a second power coupling 150, a power switching assembly 170 and a housing 180. The first transmission shaft 110 and the second transmission shaft 120 are rotatably mounted at both ends of the housing 180. The third transmission shaft 130 is rotatably mounted on the housing 180 and is located between the first transmission shaft 110 and the second transmission shaft 120. The two ends of the third transmission shaft 130 are spaced from the first transmission shaft 110 and the second transmission shaft 120, respectively. The first power coupling 140 is disposed between the first transmission shaft 110 and the third transmission shaft 130. The second power coupling 150 is disposed between the second transmission shaft 120 and the third transmission shaft 130. The power switching assembly 170 acts on the first power coupling member 140 and the second power coupling member 150 , so that the first power coupling member 140 couples the first transmission shaft 110 and the third transmission shaft 130 or the second power coupling member 150 couples the second transmission shaft 120 and the third transmission shaft 130 .

[0066] In this embodiment, a first power coupling 140 is set between the first transmission shaft 110 and the third transmission shaft 130, and a second power coupling 150 is set between the second transmission shaft 120 and the third transmission shaft 130, and a power switching component 170 acts on the first power coupling 140 and the second power coupling 150. The power switching component 170 can be used to simultaneously control the first power coupling 140 and the second power coupling 150 to realize one of the first transmission shaft 110 and the second transmission shaft 120 and the third transmission shaft 130. The overall structure is simple and can be realized by operating the power switching component 170, so the operation is more convenient.

[0067] Please refer to Figures 1 to 5 In this embodiment, the first transmission shaft 110 is used for transmission connection with the common power equipment. The second transmission shaft 120 is transmission connected with the backup power equipment. The third transmission shaft 130 is transmission connected with the equipment that needs to be operated. The common power can be a motor, and the backup power can be an engine. In the event of a power outage, damage or maintenance of the common power equipment, the power switching mechanism 100 can be used to switch to the backup power equipment to achieve continuous operation, so that the first transmission shaft 110 and the second transmission shaft 120 are both used as power transmission shafts, and the third transmission shaft 130 is used as a power output shaft. In other embodiments, the second transmission shaft 120 can also be transmission connected to the common power equipment, and the first transmission shaft 110 can be transmission connected to the backup power equipment.

[0068] In this embodiment, the housing 180 is provided with a cavity 181, and mounting holes 182 are arranged at both ends of the cavity 181. The first transmission shaft 110 and the second transmission shaft 120 are both mounted on the mounting holes 182 at both ends of the cavity 181 through bearings. Two support seats 183 are arranged in the cavity 181, and the two support seats 183 are both provided with fixing holes 184. The third transmission shaft 130 is mounted on the fixing holes 184 of the two support seats 183 through bearings. The first transmission shaft 110, the second transmission shaft 120, and the third transmission shaft 130 are coaxially arranged.

[0069] Please refer to Figures 1 to 5 Furthermore, in this embodiment, the third transmission shaft 130 is a gear shaft, which can transmit power to the outside through gear meshing. Of course, in other embodiments of the present application, the third transmission shaft 130 can also transmit power to the outside through other commonly used transmission methods, such as chain transmission, in which a chain plate is arranged on the third transmission shaft 130. Another example is a worm gear transmission, in which the third transmission shaft 130 is arranged in the shape of a worm.

[0070] In this embodiment, the housing 180 includes a first end cover 185, a middle housing 186, and a second end cover 187. The first end cover 185 and the second end cover 187 are detachably mounted on both sides of the middle housing 186 by bolts. The support seat 183 is disposed on the middle housing 186. The first transmission shaft 110 is mounted on the first end cover 185 by a bearing, and the second transmission shaft 120 is mounted on the second end cover 187 by a bearing. Such a configuration of the housing 180 facilitates assembly.

[0071] Please refer to Figures 1 to 5 In this embodiment, the power switching assembly 170 includes an operating rod 171. The first power coupling member 140 is movably disposed between the first transmission shaft 110 and the third transmission shaft 130. The second power coupling member 150 is movably disposed between the second transmission shaft 120 and the third transmission shaft 130. The first transmission shaft 110 is provided with a first through hole 111, and the third transmission shaft 130 is provided with a second through hole 131. The operating rod 171 is penetrated in the first through hole 111 and the second through hole 131, and one end of the operating rod 171 extends from the end of the first transmission shaft 110, and the operating rod 171 can act on the first power coupling member 140 and the second power coupling member 150. The operating rod 171 can drive the first power coupling member 140 and the second power coupling member 150 to move, so that the first power coupling member 140 is coupled to both the first transmission shaft 110 and the third transmission shaft, and the second power coupling member 150 is decoupled from at least one of the second transmission shaft 120 and the third transmission shaft 130.

[0072] In this embodiment, the operating rod 171 is provided, so that the operating rod 171 is used to drive the first power coupling member 140 and the second power coupling member 150 to move, so that power switching can be better realized and the operation is more convenient.

[0073] In this embodiment, the power switching assembly 170 further includes a first elastic member 172. The first elastic member 172 is disposed between the first power coupling member 140 and the first transmission shaft 110. The first elastic member 172 can provide elastic force to the first power coupling member 140 so that the first power coupling member 140 remains coupled with the first transmission shaft 110 and the second transmission shaft 120.

[0074] The main purpose of setting the first elastic member 172 in this embodiment is that the first elastic member 172 can keep the first power coupling member 140 in a coupled state when the first power coupling member 140 is coupled with the first transmission shaft 110 and the third transmission shaft 130 at the same time, so as to avoid the problem of decoupling of the first power coupling member 140 due to non-human reasons such as rotation and vibration. At the same time, the setting of the first elastic member 172 allows the operating rod 171 to be fixed without fixing, and the structure is simpler.

[0075] Please refer to Figures 1 to 5 In this embodiment, the first power coupling member 140 is provided with a first interlocking structure and a second interlocking structure. The first transmission shaft 110 is provided with a third interlocking structure that cooperates with the first interlocking structure. The first power coupling member 140 is movably mounted on the first transmission shaft 110, and the first interlocking structure is interlocked with the third interlocking structure. The first elastic member 172 is a spring, the first elastic member 172 is sleeved on the operating rod 171, and the two ends of the first elastic member 172 act on the first transmission shaft 110 and the first power coupling member 140 respectively. The third transmission shaft 130 is provided with a fourth interlocking structure that cooperates with the second interlocking structure. The operating rod 171 can drive the first power coupling member 140 to move in a direction close to the third transmission shaft 130, so that the second interlocking structure will be interlocked with the fourth interlocking structure.

[0076] Please refer to Figures 1 to 5 In this embodiment, the first power coupling member 140 is movably mounted on the first transmission shaft 110. When switching the power, the operation rod 171 can be pushed, which makes the operation more convenient. The first elastic member 172 is set as a spring, and the spring is sleeved on the operation rod 171, which makes it easier to apply force and install the spring. Secondly, when the first power coupling member 140 is uncoupled, the first power coupling member 140 will not rotate, thereby improving energy utilization.

[0077] Specifically, a mounting groove 112 is concavely provided at the center of the inner end surface of the first transmission shaft 110, and a third interlocking structure is arranged on the inner wall of the mounting groove 112. The third interlocking structure is an internal spline. The first power coupling 140 is disc-shaped, and its size matches the mounting groove 112. The first interlocking structure is an external spline arranged on the outer periphery of the first power coupling 140. The first power coupling 140 is movably mounted in the mounting groove 112 by means of the meshing of internal and external splines. A fixing groove 141 is provided at one end of the first power coupling 140 close to the third transmission shaft 130. The second interlocking structure is an internal spline arranged on the inner wall of the fixing groove 141. The fourth interlocking structure is an external spline arranged on the outer periphery of the third transmission shaft 130. In the process of the operating rod 171 pushing the first power coupling 140 to move in the direction of the third transmission shaft 130, the internal spline of the first power coupling 140 will mesh with the external spline of the third transmission shaft 130. Secondly, a limiting structure is also provided, which can limit the moving position of the first power coupling member 140 to prevent the first power coupling member 140 from escaping from the first transmission shaft 110 .

[0078] Please refer to Figures 1 to 5 In this embodiment, the first power coupling member 140 is installed by setting a mounting groove 112 on the inner end surface of the first transmission shaft 110, which can save the length of the first transmission shaft 110, so that the position of the first transmission shaft 110 corresponding to the mounting groove 112 can be used to install the bearing. The first interlocking structure, the second interlocking structure, the third interlocking structure and the fourth interlocking structure are arranged as splines for easier processing.

[0079] It can be understood that the first power coupling member 140 has a separation position and a coupling position relative to the third transmission shaft 130. When the first power coupling member 140 is in the separation position, the first power coupling member 140 is accommodated in the mounting groove 112. When the first power coupling member 140 is in the coupling position, the first power coupling member 140 is partially moved out of the mounting groove 112 and coupled with the end of the third transmission shaft 130.

[0080] Of course, in some other embodiments of the present application, the first power coupling member 140 may also be movably installed on the third transmission shaft 130 , and the first power coupling member 140 may be pulled outward by the operating rod 171 to couple with the first transmission shaft 110 .

[0081] Please refer to Figures 1 to 5In this embodiment, the power switching assembly 170 further includes a second elastic member 173 and a stopper 174. The second power coupling member 150 is movably mounted on the second transmission shaft 120 and coupled with the second transmission shaft 120. The second power coupling member 150 has a first position coupled with both the second transmission shaft 120 and the third transmission shaft 130 and a second position coupled with the second transmission shaft 120 and separated from the third transmission shaft 130. The second power coupling member 150 can move from the first position to the second position under the action of the operating rod 171. The second elastic member 173 is configured to provide an elastic force to the second power coupling member 150 in the direction of the third transmission shaft 130. The stopper 174 is disposed on the housing 180. When the operating rod 171 drives the second power coupling member 150 to move to the second position, the stopper 174 can abut against the second power coupling member 150 to limit the second power coupling member 150 to the second position. The second transmission shaft 120 drives the second power coupling 150 to rotate, which can release the restriction of the stopper 174 on the second power coupling 150, so that the second elastic member 173 drives the second power coupling 150 to move toward the first position; when the second power coupling 150 moves toward the first position, it can drive the operating rod 171 to move and drive the first power coupling 140 to move, so that the first power coupling 140 is decoupled from at least one of the first transmission shaft 110 or the third transmission shaft 130.

[0082] In this embodiment, a second elastic member 173 and a stopper 174 are provided. The stopper 174 can fix the second power coupling member 150 in the second position, thereby preventing the second power coupling member 150 from being moved unintentionally. The second elastic member 173 can be provided to push the second power coupling member 150 to achieve coupling while the first power coupling member 140 is decoupled after the restriction of the stopper 174 is released, and the structure is simpler. Most importantly, the provision of the stopper 174 and the second elastic member 173 can automatically achieve the coupling of the second power coupling member 150 with the second transmission shaft 120 and the third transmission shaft 130, without the need for operation, and can be achieved by simply inputting power to the second transmission shaft 120. The advantage of such a provision is that it can be coordinated with an automation system to achieve power switching without operation.

[0083] In one usage scenario, the first transmission shaft 110 is connected to a motor, and the second transmission shaft 120 is connected to a fuel engine. Under normal power supply conditions, the motor provides power. When the system detects that the motor is shut down, the system can automatically run the fuel engine. The operation of the fuel engine drives the second transmission shaft 120 to rotate, and the second transmission shaft 120 rotates the stopper 174 to release the restriction on the second power coupling member 150. After that, the second elastic member 173 can push the second power coupling member 150 to move, and the operating rod 171 cooperates to drive the first power coupling member 140 to move, thereby realizing power switching, thereby ensuring continuous power output of the third transmission shaft 130.

[0084] Secondly, in another usage scenario, the first transmission shaft 110 is connected to a motor, and the second transmission shaft 120 is connected to a manual operating component such as a hand wheel. When manual operation is required, the operator does not need to manually switch the power, but only needs to drive the hand wheel to rotate to drive the second transmission shaft 120 to rotate to achieve power switching. When the driving hand wheel is switched to the motor input, the user only needs to operate the operating lever 171.

[0085] Please refer to Figures 1 to 5 In this embodiment, an abutment groove is provided on the outer periphery of the second power coupling 150, and the abutment groove is provided with a first guide portion 152. The stopper 174 is elastic, one end of the stopper 174 is connected to the housing 180, and the other end extends toward the direction of the second power coupling 150, and can be deformed in the radial direction of the second power coupling 150. When the second power coupling 150 moves from the first position to the second position, the stopper 174 can be inserted into the abutment groove under the action of its own elastic force. When the stopper 174 is inserted into the abutment groove, when the second power coupling 150 rotates, the stopper 174 will be guided out of the abutment groove under the action of the first guide portion 152 to release the abutment.

[0086] In this embodiment, an abutment groove is set on the second power coupling member 150. When the operating rod 171 pushes the second power coupling member 150 to move to the second position, the second power coupling member 150 will stop rotating, and the end of the stopper 174 will correspond to the abutment groove, and the stopper 174 will be inserted into the abutment groove under the action of its own elastic deformation. At this time, since one side of the second power coupling member 150 is subjected to the elastic force of the second elastic member 173, and the other side is resisted by the stopper 174, the forces on both sides are constant, so that the second power coupling member 150 remains stationary in the second position. In this application, a second guide portion 154 is set in the abutment groove, and when the second transmission shaft 120 drives the second power coupling member 150 to rotate, the first guide portion 152 can guide the stopper 174 outward to the outside of the abutment groove. Afterwards, one side of the second power coupling member 150 loses the abutment restriction, while the other side is in the compressed energy storage state of the second elastic member 173, and the second elastic member 173 pushes the second power coupling member 150 from the second position to the first position, so that the second power coupling member 150 couples the second transmission shaft 120 and the third transmission shaft 130, and at the same time, the operating rod 171 pushes the first power coupling member 140 to move and release the coupling. The overall structure is simple, easy to implement, and all are mechanical components, so the stability is stronger.

[0087] Please refer to Figures 1 to 5In this embodiment, the stopper 174 is made of an elastic metal sheet. The stopper 174 includes a first section, a second section, a third section and a fourth section which are bent and connected. The first section and the second section are vertically arranged. The first section is fixed to the support seat 183 of the shell 180 by bolts. The second section extends vertically in the direction of the second power coupling 150 and is located at the outer periphery of the second power coupling 150. The third section is bent relative to the second section toward the second power coupling 150. The fourth section is bent relative to the third section, and the fourth section is parallel to the second section. The length of the fourth section is relatively small, mainly to make the force direction axial. After the stopper 174 is normally installed, the stopper 174 is in a pre-compression state, and under the action of the restoring force, the fourth section will always abut against the outer periphery of the second power coupling 150.

[0088] In this embodiment, the abutment groove is an annular groove 151. The annular groove 151 is recessed in the end face of the second power coupling 150 and is located at the outer periphery of the second power coupling 150, and the outer side of the annular groove 151 passes through the outer periphery of the second power coupling 150. The first guide portion 152 is convexly disposed on the bottom wall of the annular groove 151, and the outer side of the first guide portion 152 forms a first guide surface 153. One end of the first guide surface 153 is connected to the side wall of the annular groove 151, and the other end extends outward to the outer periphery of the second power coupling 150. In this way, the first guide surface 153 can realize stable guidance of the stopper 174 to prevent the stopper 174 from being damaged due to the high-speed rotation of the second power coupling 150.

[0089] In this embodiment, the bottom wall of the annular groove 151 is protruded with a second guide portion 154, and the first guide portion 152 and the second guide portion 154 are arranged at intervals in the circumferential direction of the annular groove 151. The side wall of the first guide portion 152 forms a second guide surface 155, one end of the second guide surface 155 is connected to the side wall of the annular groove 151, and the other end extends outward in the counterclockwise direction to the outer periphery of the second power coupling 150. One end of the first guide surface 153 is connected to the side wall of the annular groove 151, and the other end extends outward in the clockwise direction to the outer periphery of the second power coupling 150. When the second power coupling 150 is in the second position, the stopper 174 corresponds to the annular groove 151 and can be inserted into the annular groove 151.

[0090] In this embodiment, the first guide surface 153 and the second guide surface 155 are provided, so that the second power coupling member 150 can move the stopper 174 out of the abutment groove when the second power coupling member 150 rotates forward or reverse. When the second power coupling member 150 rotates clockwise, since the stopper 174 is stationary, the stopper 174 will be guided out of the annular groove 151 under the action of the second guide surface 155. When the second power coupling member 150 rotates counterclockwise, since the stopper 174 is stationary, the stopper 174 will be guided out of the annular groove 151 under the action of the first guide surface 153.

[0091] Please refer to Figures 1 to 5 In this embodiment, there are two stoppers 174, which are arranged on two opposite sides, ie, 180° apart and on the same circumference, so as to ensure stable force.

[0092] Further, a third guide surface 156 is formed on the side wall of the first guide portion 152, and one end of the third guide surface 156 is connected to the side wall of the annular groove 151. The other end of the third guide surface 156 extends outwardly in the counterclockwise direction to the outer periphery of the second power coupling 150, and is connected to one side of the first guide surface 153 extending to the outer periphery. A fourth guide surface 157 is also formed on the side wall of the second guide portion 154. One end of the fourth guide surface 157 is connected to the side wall of the annular groove 151. The other end of the fourth guide surface 157 extends outwardly in the clockwise direction to the outer periphery of the second power coupling 150, and is connected to one side of the second guide surface 155 extending to the outer periphery.

[0093] In this embodiment, the first guide portion 152 and the second guide portion 154 are guide bosses protruding from the bottom wall of the annular groove 151, and the two are spaced 180 degrees apart. When the second power coupling member 150 rotates, the side wall of the guide boss will abut against the stopper 174, causing the stopper 174 to elastically deform in a direction away from the center of the second power coupling member 150.

[0094] In this embodiment, the depth of the annular groove 151 is greater than the height of the first guide portion 152 and the second guide portion 154, so as to form a three-step surface on the end surface of the second power coupling member 150. The first step surface 158 is the bottom wall of the annular groove 151, the second step surface 159 is the top surface of the first guide portion 152 and the second guide portion 154, and the third step surface 161 is the end surface of the second power coupling member 150. The first step surface 158, the second step surface 159 and the third step surface 161 are arranged in a shifted manner. The first guide surface 153, the second guide surface 155, the third guide surface 156 and the fourth guide surface 157 are all arc surfaces, and one end in the circumferential direction is circumscribed with the side wall of the annular groove 151, and the other end is inscribed with the outer peripheral edge of the second power coupling member 150.

[0095] Of course, in some other embodiments of the present application, the first guide surface 153, the second guide surface 155, the third guide surface 156 and the fourth guide surface 157 may also be inclined surfaces, inner concave arc surfaces, outer concave arc surfaces, etc. This embodiment is not limited to being only arc surfaces. Secondly, the shape and setting position of the abutment groove may also be adaptively adjusted, for example, the abutment groove may be set on the side of the second power coupling member 150, and guide surfaces may be set at both ends.

[0096] Please refer to Figures 1 to 5In this embodiment, a guide ring is provided on the outer periphery of the second power coupling 150, and the guide ring is larger on the top and smaller on the bottom. The upper surface of the guide ring is the bottom wall of the annular groove 151. When the second power coupling 150 moves from the first position to the second position, the side wall of the guide ring can apply an outward thrust to the stopper 174, so that the stopper 174 can deform in the reverse direction and accumulate force. When the end of the stopper 174 passes over the guide ring, the stopper 174 can have a greater restoring force, so that it can be inserted into the annular groove 151.

[0097] In this embodiment, the power switching mechanism 100 further includes a pin shaft 190. The side wall of the second transmission shaft 120 is provided with a through slide groove 121 in the radial direction, and the second power coupling member 150 is provided with a third through hole 162 in the axial direction and a through pin hole 163 in the radial direction. The second power coupling member 150 is movably mounted on the second transmission shaft 120 through the third through hole 162. The pin shaft 190 is inserted into the pin hole 163 and the slide groove 121 in sequence, and can slide along the slide groove 121, and the end of the operating rod 171 abuts against the pin shaft 190.

[0098] In this embodiment, the pin shaft 190 and the slide groove 121 are provided to limit the moving position of the second power coupling member 150 , and the operating rod 171 can act on the second power coupling member 150 more conveniently.

[0099] Specifically, the slide groove 121 has a first end surface 122 close to the third transmission shaft 130 and a second end surface 123 away from the third transmission shaft 130. The first end surface 122 and the second end surface 123 are two stop surfaces of the slide groove 121 to limit the sliding position of the second power coupling member 150. When the operating rod 171 pushes the pin shaft 190 to drive the second power coupling member 150 to move in the direction of the third transmission shaft 130 (i.e., when the second power coupling member 150 moves from the first position to the second position) until the pin shaft 190 abuts against the second end surface 123, the end of the stopper 174 passes over the second step surface 159 (the plane where the top surfaces of the first limiting portion and the second limiting portion are located), but does not pass over the third step surface 161 (i.e., the end surface of the second power coupling member 150 close to the third transmission shaft 130). At this time, the stopper 174 will be inserted into the annular groove 151 under the action of its own restoring force. After that, the operating rod 171 is released, and the second elastic member 173 will push the second power coupling member 150 to move in the opposite direction, and the end of the stopper 174 will abut against the bottom wall (first step surface 158) of the annular groove 151 or the top surface (second abutting surface) of the first limiting portion or the second limiting portion. The specific abutting position of the stopper 174 needs to be determined according to the current angle of the second transmission shaft 120. If the stopper 174 corresponds to the first guide portion 152 or the second guide portion 154 when the operating rod 171 is pushed, the second power coupling member 150 will allow the stopper 174 to abut against the top surface of the first guide portion 152 or the second guide portion 154 under the action of the second elastic member 173. If the operating rod 171 pushes the second power coupling member 150 to move, and the stop member 174 corresponds to the area between the first guide portion 152 and the second guide portion 154 , the second power coupling member 150 will allow the stop member 174 to abut against the bottom wall of the annular groove 151 between the first guide portion 152 and the second guide portion 154 under the action of the second elastic member 173 .

[0100] Providing the second abutting surface can avoid the problem of the stopper 174 abutting against the end surface of the second power coupling 150 (ie, the third step surface 161 ), thereby better achieving the release of the restriction of the stopper 174 by the rotation of the second power coupling 150 .

[0101] When the two stoppers 174 abut against the top surfaces of the first limiting portion and the second limiting portion respectively, since the setting positions of the two stoppers 174 correspond to the setting positions of the first guide portion 152 and the second guide portion 154, one stopper 174 abuts against the top surface of the first guide portion 152, and the other abuts against the top surface of the second guide portion 154, the second power coupling member 150 moves from the second position to the first position (i.e., the process of establishing coupling) and is divided into two processes as follows:

[0102] The first process is: the second transmission shaft 120 rotates with the second power coupling member 150. At this time, since the stopper 174 is fixed, the area between the first limiting portion and the second limiting portion of the second power coupling member 150 will rotate to correspond to the stopper 174, so that the two stoppers 174 are no longer in contact with the top surfaces of the first guide portion 152 and the second guide portion 154. At this time, the second power coupling member 150 will be pushed to move toward the first position under the action of the second elastic member 173, so that the end of the stopper 174 is in contact with the bottom wall of the annular groove 151.

[0103] The second process is: the second transmission shaft 120 continues to rotate with the second power coupling 150. During the rotation, the two stoppers 174 will abut outwards under the action of the outer side walls of the first guide portion 152 and the second guide portion 154, causing the stoppers 174 to deform and move out of the annular groove 151. When the stoppers 174 move out of the annular groove 151, the second power coupling 150 will move toward the first position under the action of the second elastic member 173 and move to the first position. When the second power coupling 150 is in the first position, the pin 190 moves along the slide groove 121 to abut against the first abutting surface. The setting of the first abutting surface can avoid the problem of excessive engagement between the second power coupling 150 and the third transmission shaft 130.

[0104] When the two stop members 174 respectively abut against the bottom wall of the corresponding annular groove 151 between the first limiting portion and the second limiting portion, the second power coupling member 150 moves from the second position to the first position (i.e., the process of establishing coupling) only through the second process mentioned above, which will not be described in detail.

[0105] The reason for setting the plug-in slot, the first guide portion 152 and the second guide portion 154 in the above manner is to ensure that when the operating rod 171 pushes the second power coupling member 150 to move from the first position to the second position, no matter to which angle the second power coupling member 150 is rotated, it can be ensured that it can abut against the stop member 174, and the abutment can be released by rotating the second power coupling member 150.

[0106] Secondly, it should be noted that the second position is two positions opposite to the first position. The second position may be the position of the second power coupling member 150 when the stopper 174 abuts against the top surfaces of the first guide portion 152 and the second guide portion 154. Of course, the second position is also the position of the second power coupling member 150 when the stopper 174 abuts against the bottom wall of the annular groove 151. The second position is specifically determined based on the abutting position.

[0107] Please refer to Figures 1 to 5In this embodiment, the second elastic member 173 is a spring, and the elastic force of the second elastic member 173 is greater than the elastic force of the first elastic member 172. This arrangement can ensure that when the stopper 174 is released, the elastic force of the second elastic member 173 can overcome the elastic force of the first elastic member 172 and simultaneously push the first power coupling member 140 and the second power coupling member 150 to move. The second elastic member 173 is sleeved on the outer periphery of the second transmission shaft 120, and one end abuts against the second power coupling member 150. An abutment disk 124 is provided at a position of the second transmission shaft 120 corresponding to the other end of the second elastic member 173, and the abutment disk 124 rotates synchronously with the second transmission shaft 120, and the other end of the second elastic member 173 rotates with the abutment sheet.

[0108] The abutment plate 124 is provided to ensure synchronous rotation of the second elastic member 173, the second transmission shaft 120 and the second power coupling member 150, and avoid direct abutment of the second elastic member 173 away from the end of the second power coupling member 150 with the shell 180, thereby increasing the service life of the second elastic member 173.

[0109] Please refer to Figures 1 to 5 In this embodiment, the inner wall of the third through hole 162 is provided with an inner spline, and the outer periphery of the second transmission shaft 120 is provided with an outer spline. The second power coupling member 150 is movably mounted on the second transmission shaft 120 in the direction of the meshing of the inner and outer splines. This arrangement can prevent the pin shaft 190 from bending due to torsion, thereby affecting the smoothness of the pin shaft 190 sliding with respect to the slide groove 121.

[0110] Further, the third transmission shaft 130 is provided with an engagement disk 132, and a fifth interlocking structure 133 is provided at one end of the engagement disk 132 close to the second transmission shaft 120. A sixth interlocking structure 164 is provided at one end of the second power coupling 150 close to the third transmission shaft 130. When the second power coupling 150 is in the first position, the fifth interlocking structure 133 and the sixth interlocking structure 164 are engaged, and when the second power coupling 150 is in the second position, the fifth interlocking structure 133 and the sixth interlocking structure 164 are separated.

[0111] In this embodiment, the fifth interlocking structure 133 and the sixth interlocking structure 164 are both a plurality of convex teeth arranged at intervals in the circumferential direction. An engagement groove is formed between two adjacent convex teeth, and the convex teeth on the engagement sheet can be inserted into the engagement grooves on the end face of the second power coupling member 150 one by one, and the convex teeth on the end face of the second power coupling member 150 can be inserted into the engagement grooves on the engagement disk 132 one by one.

[0112] Please refer to Figures 1 to 5In this embodiment, the operating rod 171 includes a first operating rod 175 and a second operating rod 176. The first through hole 111 is provided with an abutting ring. The first operating rod 175 is provided with a limiting ring, and the first operating rod 175 is inserted into the first through hole 111 from the inner side of the first transmission shaft 110. The limiting ring and the abutting ring cooperate to limit the first operating rod 175 from slipping out of the first through hole 111. The first elastic member 172 is sleeved on the first operating rod 171, and one end abuts against the limiting ring, and the other end abuts against the first power coupling member 140. The second operating rod 176 is inserted into the second through hole 131, and one end of the second operating rod 176 abuts against the first power coupling member 140, and the other end abuts against the pin shaft 190, and is limited between the two and cannot slip out.

[0113] In this embodiment, the operating rod 171 is arranged at two ends, which is more convenient for assembly. In addition, when the first power coupling member 140 is uncoupled, the first operating rod 175 will not continue to rotate, thereby being safer.

[0114] In this embodiment, a stepped hole 142 is provided at the center of the first power coupling member 140 , and the end of the second operating rod 176 is inserted into the stepped hole 142 and abuts against the step in the stepped hole 142 , thereby ensuring the stability of the installation of the second operating rod 176 .

[0115] When the power switching mechanism 100 provided in this embodiment is used specifically, when it is necessary to switch the input of the second transmission shaft 120 to the input of the first transmission shaft 110, it is only necessary to push the first operating rod 175 inward, which is more convenient to operate. When it is necessary to switch the input of the first transmission shaft 110 to the input of the second transmission shaft 120, it is only necessary to let the power device connected to the second transmission shaft 120 drive the second transmission shaft 120 to rotate to realize automatic switching, without manual switching.

[0116] It should also be noted that in some special usage scenarios, the first transmission shaft 110 and the second transmission shaft 120 can also be used as output shafts, or the first transmission shaft 110 is used as an output shaft and the second transmission shaft 120 is used as an input shaft. The third transmission shaft 130 can also be used as an output shaft or an input shaft according to requirements. It can be seen that this embodiment does not limit the first transmission shaft 110 and the second transmission shaft 120 to be used only as input shafts, nor does it limit the third transmission shaft 130 to be used only as an output shaft.

[0117] In summary, the power switching mechanism 100 provided in the embodiment of the present invention is configured by setting a first power coupling 140 between the first transmission shaft 110 and the third transmission shaft 130, and setting a second power coupling 150 between the second transmission shaft 120 and the third transmission shaft 130, and enabling the power switching component 170 to act on the first power coupling 140 and the second power coupling 150. The power switching component 170 can be used to simultaneously control the first power coupling 140 and the second power coupling 150 to realize one of the first transmission shaft 110 and the second transmission shaft 120 and the third transmission shaft 130. The overall structure is simple and can be realized by operating the power switching component 170, so the operation is more convenient.

[0118] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A power switching mechanism, characterized in that: It comprises a first transmission shaft (110), a second transmission shaft (120), a third transmission shaft (130), a first power coupling member (140), a second power coupling member (150), a power switching assembly (170) and a housing (180); The first transmission shaft (110) and the second transmission shaft (120) are rotatably mounted on two ends of the housing (180); The third transmission shaft (130) is rotatably mounted on the housing (180) and is located between the first transmission shaft (110) and the second transmission shaft (120), and two ends of the third transmission shaft (130) are respectively spaced apart from the first transmission shaft (110) and the second transmission shaft (120); The first power coupling member (140) is arranged between the first transmission shaft (110) and the third transmission shaft (130); The second power coupling member (150) is arranged between the second transmission shaft (120) and the third transmission shaft (130); The power switching assembly (170) acts on the first power coupling member (140) and the second power coupling member (150), so that the first power coupling member (140) couples the first transmission shaft (110) and the third transmission shaft (130) or the second power coupling member (150) couples the second transmission shaft (120) and the third transmission shaft (130).

2. The power switching mechanism according to claim 1, characterized in that: The power switching assembly (170) comprises an operating rod (171); The first power coupling member (140) is movably disposed between the first transmission shaft (110) and the third transmission shaft (130); The second power coupling member (150) is movably disposed between the second transmission shaft (120) and the third transmission shaft (130); The first transmission shaft (110) is provided with a first through hole (111), and the third transmission shaft (130) is provided with a second through hole (131); The operating rod (171) is inserted into the first through hole (111) and the second through hole (131), and one end of the operating rod (171) extends out from the end of the first transmission shaft (110). The operating rod (171) can act on the first power coupling member (140) and the second power coupling member (150); The operating rod (171) can drive the first power coupling member (140) and the second power coupling member (150) to move, so that the first power coupling member (140) is coupled with both the first transmission shaft (110) and the third transmission shaft (130), and the second power coupling member (150) is decoupled from at least one of the second transmission shaft (120) and the third transmission shaft (130).

3. The power switching mechanism according to claim 2, characterized in that: The power switching assembly (170) further includes a first elastic member (172); The first elastic member (172) is arranged between the first power coupling member (140) and the first transmission shaft (110), and the first elastic member (172) can provide elastic force to the first power coupling member (140) so as to keep the first power coupling member (140) and the first transmission shaft (110) and the second transmission shaft (120) in a coupled state.

4. The power switching mechanism according to claim 3, characterized in that: The first power coupling member (140) is provided with a first interlocking structure and a second interlocking structure; The first transmission shaft (110) is provided with a third interlocking structure that cooperates with the first interlocking structure; The first power coupling member (140) is movably mounted on the first transmission shaft (110), and the first engaging structure is engaged with the third engaging structure; The first elastic member (172) is a spring, the first elastic member (172) is sleeved on the operating rod (171), and two ends of the first elastic member (172) act on the first transmission shaft (110) and the first power coupling member (140) respectively; The third transmission shaft (130) is provided with a fourth interlocking structure that cooperates with the second interlocking structure; The operating rod (171) can drive the first power coupling member (140) to move in a direction close to the third transmission shaft (130), so that the second engaging structure can engage with the fourth engaging structure.

5. The power switching mechanism according to any one of claims 2 to 4, characterized in that: The power switching assembly (170) further includes a second elastic member (173) and a stop member (174); The second power coupling member (150) is movably mounted on the second transmission shaft (120) and coupled to the second transmission shaft (120), and the second power coupling member (150) has a first position coupled to both the second transmission shaft (120) and the third transmission shaft (130) and a second position coupled to the second transmission shaft (120) and separated from the third transmission shaft (130); The second elastic member (173) is configured to provide an elastic force to the second power coupling member (150) in a direction toward the third transmission shaft (130); The stopper (174) is arranged on the housing (180), and when the operating rod (171) drives the second power coupling member (150) to move to the second position, the stopper (174) can abut against the second power coupling member (150) to limit the second power coupling member (150) to the second position; The second transmission shaft (120) drives the second power coupling member (150) to rotate to release the restriction of the stop member (174) on the second power coupling member (150), so that the second elastic member (173) drives the second power coupling member (150) to move toward the first position; The movement of the second power coupling member (150) toward the first position can drive the operating rod (171) to move and drive the first power coupling member (140) to move, so that the first power coupling member (140) is decoupled from at least one of the first transmission shaft (110) or the third transmission shaft (130).

6. The power switching mechanism according to claim 5, characterized in that: The outer periphery of the second power coupling member (150) is provided with an abutment groove, and the abutment groove is provided with a first guide portion (152); The stopper (174) is elastic, one end of the stopper (174) is connected to the housing (180), and the other end of the stopper (174) extends toward the second power coupling (150) and can be deformed in the radial direction of the second power coupling (150); When the second power coupling member (150) moves to the second position, the stop member (174) can be inserted into the abutment groove under the action of its own elastic force; When the stopper (174) is inserted into the abutment groove, when the second power coupling member (150) rotates, the stopper (174) will be guided out of the abutment groove under the action of the first guide portion (152) to release the abutment.

7. The power switching mechanism according to claim 6, characterized in that: The abutment groove is an annular groove (151), the annular groove (151) is recessed on the end surface of the second power coupling member (150) and is located at the outer periphery of the second power coupling member (150), and the outer side of the annular groove (151) passes through the outer periphery of the second power coupling member (150); The first guide portion (152) is protruding from the bottom wall of the annular groove (151), and the outer side of the first guide portion (152) forms a first guide surface (153); One end of the first guide surface (153) is connected to the side wall of the annular groove (151), and the other end extends outward to the outer periphery of the second power coupling member (150).

8. The power switching mechanism according to claim 7, characterized in that: The bottom wall of the annular groove (151) is further provided with a second guide portion (154), and the first guide portion (152) and the second guide portion (154) are arranged at intervals in the circumferential direction of the annular groove (151); The side wall of the first guide portion (152) forms a second guide surface (155), one end of the second guide surface (155) is connected to the side wall of the annular groove (151), and the other end extends outward in a counterclockwise direction to the outer periphery of the second power coupling member (150); One end of the first guide surface (153) is connected to the side wall of the annular groove (151), and the other end extends outward in a clockwise direction to the outer periphery of the second power coupling member (150).

9. The power switching mechanism according to claim 5, characterized in that: The power switching mechanism also includes a pin shaft (190); a side wall of the second transmission shaft (120) is provided with a through slide groove (121) in the radial direction; the second power coupling member (150) is provided with a third through hole (162) in the axial direction, and a through pin hole (163) is provided in the radial direction; the second power coupling member (150) is movably mounted on the second transmission shaft (120) through the third through hole (162); the pin shaft (190) is inserted into the pin hole (163) and the slide groove (121) in sequence, and can slide along the slide groove (121), and the end of the operating rod (171) is in contact with the pin shaft (190); and / or The third transmission shaft (130) is provided with an engagement disk (132), and a fifth interlocking structure (133) is provided at one end of the engagement disk (132) close to the second transmission shaft (120); a sixth interlocking structure (164) is provided at one end of the second power coupling member (150) close to the third transmission shaft (130); when the second power coupling member (150) is in the first position, the fifth interlocking structure (133) and the sixth interlocking structure (164) are engaged; when the second power coupling member (150) is in the second position, the fifth interlocking structure (133) and the sixth interlocking structure (164) are separated.

10. The power switching mechanism according to any one of claims 2 to 4, characterized in that: The operating rod (171) comprises a first operating rod (175) and a second operating rod (176); The first through hole (111) is provided with an abutment ring platform; The first operating rod (175) is provided with a limiting ring platform, and the first operating rod (175) is inserted into the first through hole (111) from the inner side of the first transmission shaft (110), and the limiting ring platform and the abutting ring platform cooperate to limit the first operating rod (175) from falling out of the first through hole (111); The second operating rod (176) is inserted into the second through hole (131), and one end of the second operating rod (176) abuts against the first power coupling member (140), and the other end acts on the second power coupling member (150).

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