Fastening and unfastening mechanism, electronic screwdriver, and fastening switching device

Abstract

A fastening and unfastening mechanism (100), relating to the technical field of battery swapping. The fastening and unfastening mechanism comprises a main shaft (10), a nut socket (20), and a screw bit (30). The nut socket is connected to one end of the main shaft, and the nut socket is used to be fitted with a nut. The screw bit is movably inserted into the nut socket in the axial direction of the main shaft, and the screw bit is used to be fitted with a screw. The main shaft is provided with a first clutch part (11), and the screw bit is provided with a second clutch part (31). The screw bit moves in the axial direction of the main shaft, so that the first clutch part and the second clutch part can be fitted with or separated from one another. The first clutch part and the second clutch part are configured to: when fitted with one another, restrict the screw bit from rotating relative to the main shaft; and, when separated from one another, allow the screw bit to rotate relative to the main shaft. The described fastening and unfastening mechanism can achieve different operating states so as to meet different operating requirements, such that the range of application of the fastening and unfastening mechanism can be widened. Moreover, the structure and operation are simple, and the space occupied is small. In addition, further disclosed are an electronic screwdriver and a fastening switching device.

Description

Locking and unlocking mechanisms, electric screwdrivers, and lock changing equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023223676348, filed on September 1, 2023, entitled “Locking and unlocking mechanism, electric screwdriver and lock changing device,” and the entire contents of both applications are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery replacement technology, and more specifically, to a locking and unlocking mechanism, an electric screwdriver, and a lock changing device. Background Art

[0004] With the advancement of science and technology, the battery industry has developed rapidly, and the market share and frequency of use of electric equipment are also increasing. Electric vehicles such as electric vehicles are gradually appearing in various application scenarios. At the same time, in order to improve the convenience of electric equipment, especially electric vehicles, battery swap stations for rapid battery replacement have appeared on the market. Among them, electric equipment needs to be frequently replaced. During the battery replacement process, an electric screwdriver is usually used to unlock and lock the locking mechanism between the battery and the electrical equipment to realize the battery replacement function. However, the structure and function of the unlocking mechanism of the existing electric screwdriver are relatively simple, and the scope of application is narrow, which cannot meet the battery replacement needs.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a locking and unlocking mechanism, an electric screwdriver, and a lock changing device, which can effectively improve the scope of application of the locking and unlocking mechanism.

[0007] In the first aspect, an embodiment of the present application provides a locking and unlocking mechanism, comprising a spindle, a nut sleeve and a screw bit; the nut sleeve is connected to one end of the spindle, and the nut sleeve is used to cooperate with the nut; the screw bit is movably inserted into the nut sleeve along the axial direction of the spindle, and the screw bit is used to cooperate with the screw; wherein, the spindle is provided with a first clutch portion, and the screw bit is provided with a second clutch portion, and the axial movement of the screw bit along the spindle can enable the first clutch portion and the second clutch portion to engage or separate, and the first clutch portion and the second clutch portion are configured to: limit the rotation of the screw bit relative to the spindle when engaging with each other; and allow the screw bit to rotate relative to the spindle when separating from each other.

[0008] In the above technical solution, by connecting the nut sleeve at one end of the spindle, the spindle can drive the nut sleeve to rotate synchronously to loosen or tighten the nut, and by arranging a screw bit movable along the axial direction of the spindle in the nut sleeve, the screw bit can be moved close to or away from the spindle when the screw bit is moved axially along the spindle during operation, so that the second clutch portion of the screw bit can cooperate or separate with the first clutch portion of the spindle, thereby limiting the rotation of the nut bit relative to the spindle when the first clutch portion and the second clutch portion cooperate with each other, so that the spindle can drive the screw bit to rotate synchronously and loosen or tighten the screw, and it can be achieved that when the first clutch portion and the second clutch portion are separated from each other, the nut bit is allowed to rotate relative to the spindle, so that the spindle can only drive the nut sleeve to operate on the nut, thereby realizing different operating states of the locking and unlocking mechanism to meet different operating requirements, which is conducive to improving the applicability of the locking and unlocking mechanism, and the structure and operation of the locking and unlocking mechanism are relatively simple and occupy less space.

[0009] In some embodiments, along the axial direction of the main shaft, the first clutch portion is protruded from one end of the main shaft facing the screw bit, the second clutch portion is protruded from one end of the screw bit facing the main shaft, and the second clutch portion is arranged opposite to the first clutch portion.

[0010] In the above technical solution, by protruding the first clutch portion at one end of the main shaft facing the screw bit, and protruding the second clutch portion at one end of the screw bit facing the main shaft, the first clutch portion and the second clutch portion can be arranged relative to each other in the axial direction of the main shaft, thereby reducing the difficulty of the first clutch portion and the second clutch portion to cooperate or separate with each other when the screw bit moves along the axial direction of the main shaft, so that the first clutch portion and the second clutch portion can cooperate or separate with each other, and the structure is simple and easy to manufacture.

[0011] In some embodiments, along the axial direction of the main shaft, a first tooth-shaped portion is formed on one end of the first clutch portion facing the second clutch portion, and a second tooth-shaped portion is formed on one end of the second clutch portion facing the first clutch portion. The second tooth-shaped portion is used to engage with the first tooth-shaped portion to achieve cooperation between the first clutch portion and the second clutch portion.

[0012] In the above technical solution, a first tooth-shaped portion is provided at one end of the first clutch portion facing the second clutch portion, and correspondingly, a second tooth-shaped portion is provided at one end of the second clutch portion facing the first clutch portion, so that when the screw bit moves in the axial direction of the main shaft, the second tooth-shaped portion can be driven to engage or disengage with the first tooth-shaped portion, thereby achieving the coordination or separation of the second clutch portion and the first clutch portion, so that when the first tooth-shaped portion and the second tooth-shaped portion are engaged with each other, the screw bit can be restricted from rotating relative to the main shaft. The structure is simple and easy to implement. In addition, by respectively providing the first tooth-shaped portion and the second tooth-shaped portion on the first clutch portion and the second clutch portion, the coordination and separation difficulties of the first clutch portion and the second clutch portion can be effectively reduced, which is conducive to the coordination or separation of the first clutch portion and the second clutch portion.

[0013] In some embodiments, the locking and unlocking mechanism further includes an elastic member; the elastic member is arranged between the main shaft and the screw bit along the axial direction of the main shaft, and the elastic member is configured to drive the screw bit to move away from the main shaft to separate the first clutch part and the second clutch part.

[0014] In the above technical solution, the locking and unlocking mechanism is further provided with an elastic member, which is arranged between the main shaft and the screw bit in the axial direction of the main shaft, so that the screw bit can be driven to move away from the main shaft through the elastic force of the elastic member, so that the first clutch part and the second clutch part can be separated. The locking and unlocking mechanism with such a structure can, on the one hand, reduce the phenomenon of mismatching between the first clutch part and the second clutch part when the screw bit is not pressed down, which is conducive to improving the stability and reliability of the locking and unlocking mechanism. On the other hand, after the first clutch part and the second clutch part cooperate with each other, the first clutch part and the second clutch part can be automatically separated by the elastic member, without manual intervention, which is convenient for operation and use.

[0015] In some embodiments, the locking and unlocking mechanism further includes a first stopper and a second stopper, wherein the first stopper is arranged on the main shaft and the second stopper is arranged on the screw bit, and along the axial direction of the main shaft, the two ends of the elastic member respectively abut against the first stopper and the second stopper.

[0016] In the above technical solution, the locking and unlocking mechanism is further provided with a first stopper and a second stopper. By respectively arranging the first stopper and the second stopper on the main shaft and the screw bit, and the two ends of the elastic member are respectively abutted against the first stopper and the second stopper, so that the elastic member is arranged between the main shaft and the screw bit in the axial direction of the main shaft. The locking and unlocking mechanism with such a structure is conducive to reducing the difficulty of assembling the elastic member between the main shaft and the screw bit, and can reduce the wear caused by the elastic member to the main shaft and the screw bit, which is conducive to improving the service life of the main shaft and the screw bit.

[0017] In some embodiments, the first stop includes a first abutment portion and a first protrusion that are connected to each other. Along the axial direction of the main shaft, the first abutment portion abuts against one end of the main shaft facing the screw bit, and the first protrusion is protruding from the side of the first abutment away from the main shaft. The end of the elastic member away from the screw bit abuts against the first abutment, and part of the elastic member is sleeved on the outside of the first protrusion.

[0018] In the above technical solution, the first stopper is provided with a first abutting portion and a first protrusion, the first abutting portion abuts against one end of the main shaft, and the first protrusion protrudes from the side of the first abutting portion away from the main shaft, so that one end of the elastic member can be indirectly abutted against the main shaft through the structure abutting against the first abutting portion, and by partially sleeved the elastic member on the outside of the first protrusion, the structural stability of the elastic member assembled between the main shaft and the screw bit can be effectively improved, which is conducive to alleviating the phenomenon of the elastic member falling off, and the first protrusion can also play a certain guiding role when the elastic member is compressed, so as to improve the stability of the elastic member during the compression process.

[0019] In some embodiments, along the axial direction of the main shaft, the first clutch portion is protruded from one end of the main shaft facing the screw bit, and the first stopper is sleeved on the outer side of the first clutch portion.

[0020] In the above technical solution, by protruding the first clutch portion at the end of the main shaft facing the screw bit, and sleeved on the outside of the first clutch portion, the locking and unlocking mechanism with this structure can, on the one hand, improve the structural stability of the first stop block set on the main shaft, so as to improve the structural stability of the elastic member assembled between the main shaft and the screw bit, and on the other hand, facilitate the first clutch portion to cooperate with the second clutch portion after the elastic member is compressed, which is conducive to reducing the difficulty of cooperation between the first clutch portion and the second clutch portion.

[0021] In some embodiments, the second stop includes a second abutment portion and a second protrusion portion connected to each other. Along the axial direction of the main shaft, the second abutment portion abuts against the end of the screw bit facing the main shaft, and the second protrusion is protruding from the side of the second abutment portion away from the screw bit. The end of the elastic member away from the main shaft abuts against the second abutment portion, and part of the elastic member is sleeved on the outside of the second protrusion.

[0022] In the above technical solution, the second stop block is provided with a second abutment portion and a second protrusion, the second abutment portion abuts against one end of the screw bit, and the second protrusion protrudes from the side of the second abutment portion away from the screw bit, so that one end of the elastic member can indirectly abut against the screw bit through the structure abutting against the second abutment portion, and by partially sleeved the elastic member on the outside of the second protrusion, the structural stability of the elastic member assembled between the screw bit and the main shaft can be effectively improved, which is conducive to alleviating the phenomenon of the elastic member falling off, and the second protrusion can also play a certain guiding role when the elastic member is compressed, so as to improve the stability of the elastic member during the compression process.

[0023] In some embodiments, along the axial direction of the main shaft, the second clutch portion is protruded from one end of the screw bit facing the main shaft, and the second stopper is sleeved on the outer side of the second clutch portion.

[0024] In the above technical solution, by protruding the second clutch portion at the end of the screw bit facing the main shaft, and sleeved on the outside of the second clutch portion, the locking and unlocking mechanism with this structure can, on the one hand, improve the structural stability of the second stop block set on the screw bit, so as to improve the structural stability of the elastic member assembled between the main shaft and the screw bit, and on the other hand, facilitate the second clutch portion to cooperate with the first clutch portion after the elastic member is compressed, which is conducive to reducing the difficulty of the second clutch portion and the first clutch portion to cooperate with each other.

[0025] In some embodiments, a limiting protrusion is convexly provided on the inner circumferential surface of the nut sleeve, and along the axial direction of the main shaft, the screw bit has an abutment surface facing the limiting protrusion, the abutment surface is closer to the main shaft than the limiting protrusion, and at least part of the projection of the limiting protrusion is located within the abutment surface.

[0026] In the above technical solution, the abutment surface of the screw bit facing the limiting protrusion is set to be closer to the limiting protrusion than the limiting protrusion on the inner circumferential surface of the nut sleeve in the axial direction of the main shaft, so that the abutment surface is a structure facing the limiting protrusion and located on the side of the limiting protrusion facing the main shaft, and at least part of the projection of the limiting protrusion in the axial direction of the main shaft is set to be located on the abutment surface, so that the limiting protrusion and the abutment surface have an overlapping area in the axial direction of the main shaft, so that the abutment surface can abut against the limiting protrusion when the screw bit moves in the direction away from the main shaft, thereby playing a certain limiting role on the screw bit through the limiting protrusion, thereby alleviating the phenomenon that the screw bit disengages from the sleeve in the direction away from the main shaft in the axial direction of the main shaft, which is conducive to improving the stability of the locking and unlocking mechanism.

[0027] In some embodiments, the screw bit includes a moving part and a bit body; the moving part is movably arranged in the nut sleeve along the axial direction of the main shaft, and the second clutch part is protruded at the end of the moving part facing the main shaft, and along the axial direction of the main shaft, the side of the moving part away from the main shaft forms an abutment surface; the bit body is connected to the abutment surface, and the bit body is used to cooperate with the screw.

[0028] In the above technical solution, the screw bit is provided with a moving portion and a bit body. The moving portion is movably provided in the nut sleeve in the axial direction of the main shaft, and an abutment surface is formed on the side of the moving portion facing away from the main shaft, so that the nut bit can be abutted against the limiting protrusion through the moving portion to realize the limiting function of the limiting protrusion on the screw bit, and it is convenient to connect the bit body to the abutment surface of the moving portion, which is conducive to the cooperation between the bit body and the screw. In addition, by protruding the second clutch portion on the side of the moving portion facing away from the bit body, the moving portion can drive the second clutch portion close to the main shaft when the bit body is pressed down by the unlocking mechanism, thereby reducing the difficulty of the second clutch portion and the first clutch portion of the main shaft to cooperate with each other.

[0029] In some embodiments, the limiting protrusion is an annular structure arranged around the bit body.

[0030] In the above technical solution, by setting the limiting protrusion as an annular structure and surrounding the outer side of the bit body, the effect of the limiting protrusion on the abutment surface of the moving part can be further improved, so as to enhance the limiting effect of the limiting protrusion on the moving part of the screw bit, thereby further reducing the risk of the screw bit detaching from the sleeve in the direction away from the main shaft in the axial direction of the main shaft, which is beneficial to improving the stability of the locking and unlocking mechanism.

[0031] In some embodiments, the main shaft includes a main body and a plug-in portion; along the axial direction of the main shaft, the plug-in portion is protruded from the end of the main body facing the screw bit, and the first clutch portion is protruded from the end of the plug-in portion away from the main body; wherein, along the axial direction of the main shaft, the plug-in portion is inserted into the nut sleeve, and the end of the nut sleeve close to the main body abuts against the main body.

[0032] In the above technical solution, a plug-in portion is protruded from one end of the main body of the main shaft, and the plug-in portion is inserted into the nut sleeve, so that the end of the nut sleeve close to the main body can be abutted against the main body. On the one hand, it can play a positioning and limiting role in the axial direction of the nut sleeve in the main shaft to reduce the axial movement of the nut sleeve relative to the main shaft. On the other hand, the structure of the plug-in portion of the main shaft and the nut sleeve being plugged into each other facilitates the connection of the nut sleeve to the main shaft, which is beneficial to reducing the difficulty of assembling the nut sleeve connected to one end of the main shaft.

[0033] In some embodiments, the plug portion is interference fit with the nut sleeve.

[0034] In the above technical solution, the plug-in portion and the nut sleeve are set to an interference fit structure to achieve the connection of the nut sleeve to the main shaft, which has a simple structure and is easy to implement.

[0035] In some embodiments, the plug-in portion is provided with a first circumferential limiting portion, and the nut sleeve is provided with a second circumferential limiting portion, and the second circumferential limiting portion cooperates with the first circumferential limiting portion to limit the rotation of the nut sleeve relative to the main shaft.

[0036] In the above technical solution, by providing a first circumferential limit portion on the plug-in portion and correspondingly providing a second circumferential limit portion on the nut sleeve to cooperate with the first circumferential limit portion, circumferential locking between the nut sleeve and the main shaft can be achieved, so that the main shaft drives the nut sleeve to rotate, which is beneficial to reducing the phenomenon of the nut sleeve sliding relative to the main shaft during the process of the main shaft driving the nut sleeve to rotate.

[0037] In some embodiments, the first circumferential limiting portion is a latching protrusion provided on the outer circumferential surface of the plug-in portion, and the second circumferential limiting portion is a latching groove provided at one end of the nut sleeve abutting against the main body, and the latching protrusion is locked in the latching groove.

[0038] In the above technical solution, the first circumferential limiting portion is set as a locking protrusion arranged on the outer circumferential surface of the plug-in portion, and correspondingly, the second circumferential limiting portion is set as a locking groove arranged on one end of the nut sleeve abutting against the main body portion, so that the locking protrusion is easily locked in the locking groove to achieve the cooperation between the first circumferential limiting portion and the second circumferential limiting portion, and the locking protrusion is locked in the locking groove to achieve circumferential locking between the nut sleeve and the main shaft. The structure is simple and easy to implement and manufacture.

[0039] In a second aspect, an embodiment of the present application further provides an electric screwdriver, comprising a driving member and the above-mentioned locking and unlocking mechanism; the driving member is connected to the main shaft, and the driving member is configured to drive the main shaft to rotate.

[0040] In the above technical solution, the main shaft is connected to the driving member so that the driving member can drive the main shaft to rotate, thereby driving the nut sleeve and the screw bit to rotate, so as to realize automatic loosening or tightening of the nut or screw, which is conducive to reducing manual participation and thus improving the operating efficiency of the locking and unlocking mechanism.

[0041] In a third aspect, an embodiment of the present application further provides a lock changing device, comprising a lock changing platform and the above-mentioned electric screwdriver; a driving member is installed on the lock changing platform.

[0042] In some embodiments, the lock changing device further includes a traveling mechanism, the lock changing platform is mounted on the traveling mechanism, and the traveling mechanism is configured to drive the lock changing platform to move.

[0043] In the above technical solution, by installing the lock changing platform on the walking mechanism, the walking mechanism can drive the electric screwdriver set on the lock changing platform to move, so that the electric screwdriver can operate in different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0045] FIG1 is a schematic structural diagram of a locking and unlocking mechanism provided in some embodiments of the present application;

[0046] FIG2 is an exploded view of the locking and unlocking mechanism provided in some embodiments of the present application;

[0047] FIG3 is a cross-sectional view of a locking and unlocking mechanism (when the first clutch portion and the second clutch portion are separated) provided in some embodiments of the present application;

[0048] FIG4 is a partial enlarged view of the locking and unlocking mechanism shown in FIG3 at point A;

[0049] FIG5 is a cross-sectional view of a locking and unlocking mechanism (when the first clutch portion and the second clutch portion are engaged) provided in some embodiments of the present application;

[0050] FIG6 is a schematic structural diagram of a main shaft provided in some embodiments of the present application;

[0051] FIG7 is a cross-sectional view of a main shaft provided in some embodiments of the present application;

[0052] FIG8 is a schematic structural diagram of a screw bit provided in some embodiments of the present application;

[0053] FIG9 is a cross-sectional view of a screw bit provided in some embodiments of the present application;

[0054] FIG10 is a schematic structural diagram of a nut sleeve provided in some embodiments of the present application;

[0055] FIG11 is a cross-sectional view of a nut sleeve provided in some embodiments of the present application.

[0056] Icon: 100-locking and unlocking mechanism; 10-spindle; 11-first clutch part; 111-first tooth-shaped part; 112-first groove; 12-main body; 13-plug-in part; 131-first circumferential limiting part; 20-nut sleeve; 21-limiting protrusion; 22-first chamber; 23-second chamber; 24-second circumferential limiting part; 30-screw bit; 31-second clutch part; 311-second tooth-shaped part; 312-second groove; 32-rest surface; 33-moving part; 34-bit body; 40-elastic member; 50-first stopper; 51-first resting part; 52-first protrusion; 60-second stopper; 61-second resting part; 62-second protrusion; X-axial direction of the spindle. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0059] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0061] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0062] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0063] The term "plurality" used in this application refers to two or more (including two).

[0064] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0065] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0066] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0067] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0068] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0069] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0070] With technological advancements and the rapid development of new energy vehicles, electric vehicles are gaining increasing market share and increasing in frequency of use. Electric commercial vehicles, such as heavy-duty and light-duty electric trucks, are gradually appearing in various application scenarios, and battery swap stations have been built to accommodate these vehicles.

[0071] In the field of new energy vehicles, electric trucks have heavy loads and long mileages, and their energy consumption is greater than that of ordinary passenger cars. Therefore, in order to achieve endurance, electric trucks need to frequently replace batteries. During the battery replacement process, the locking, fixation, and separation of the battery mounted on the vehicle are key issues. In order to achieve the locking and fixation of the battery, a locking mechanism composed of a nut and a screw is currently mainly used to lock and unlock the battery, and an electric screwdriver is used to unlock and lock the locking mechanism between the battery and the vehicle. During the unlocking and locking process of the locking mechanism, the nut and the screw need to be rotated differently so that the locking mechanism between the battery and the vehicle needs to meet different rotation requirements. However, the structure and function of the locking and unlocking mechanism (bit) of the existing electric screwdriver are relatively simple, and the scope of application is relatively narrow, which cannot meet the battery replacement needs. In order to meet the multiple rotation requirements of the locking mechanism between the battery and the vehicle, in the related art, the locking and unlocking mechanism of the electric screwdriver is set to a multi-bit structure. However, the locking and unlocking mechanism of this structure is relatively complex, occupies a large space, and is relatively complicated to operate.

[0072] Based on the above considerations, in order to solve the problem that the scope of application of the locking and unlocking mechanism is narrow and the structure is relatively complex, an embodiment of the present application provides a locking and unlocking mechanism, which includes a main shaft, a nut sleeve and a screw bit. The nut sleeve is connected to one end of the main shaft, and the nut sleeve is used to cooperate with the nut. The screw bit is movably inserted into the nut sleeve along the axial direction of the main shaft, and the screw bit is used to cooperate with the screw. The main shaft is provided with a first clutch part, and the screw bit is provided with a second clutch part. The axial movement of the screw bit along the main shaft can enable the first clutch part and the second clutch part to engage or disengage. The first clutch part and the second clutch part are configured to: limit the rotation of the screw bit relative to the main shaft when engaging with each other; and allow the screw bit to rotate relative to the main shaft when disengaging from each other.

[0073] The nut is then moved to a position which allows the nut to be moved about the spindle and to the nut being tightened or loosened, and the nut being tightened or loosened by the nut being loosened or loosened.

[0074] An embodiment of the present application provides a locking and unlocking mechanism, which can solve the problems that the locking and unlocking mechanism has a relatively simple structure and function, a narrow scope of application, cannot meet the battery replacement needs, and the structure of the locking and unlocking mechanism is relatively complex and occupies a large space. The specific structure of the locking and unlocking mechanism is described in detail below with reference to the accompanying drawings.

[0075] According to some embodiments of the present application, please refer to Figures 1, 2, 3, 4, and 5. Figure 1 is a schematic diagram of the structure of a locking and unlocking mechanism 100 provided in some embodiments of the present application. Figure 2 is an exploded view of the structure of the locking and unlocking mechanism 100 provided in some embodiments of the present application. Figure 3 is a cross-sectional view of the locking and unlocking mechanism 100 provided in some embodiments of the present application (when the first clutch portion 11 and the second clutch portion 31 are separated). Figure 4 is a partial enlarged view of the locking and unlocking mechanism 100 shown in Figure 3 at point A. Figure 5 is a cross-sectional view of the locking and unlocking mechanism 100 provided in some embodiments of the present application (when the first clutch portion 11 and the second clutch portion 31 are engaged). The present application provides a locking and unlocking mechanism 100, which includes a spindle 10, a nut sleeve 20, and a screw bit 30. The nut sleeve 20 is connected to one end of the spindle 10 and is configured to engage with a nut. The screw bit 30 is movably inserted into the nut sleeve 20 along the axial direction X of the spindle and is configured to engage with a screw. The spindle 10 is provided with a first clutch portion 11, and the screw bit 30 is provided with a second clutch portion 31. The movement of the screw bit 30 along the axial direction X of the spindle can enable the first clutch portion 11 and the second clutch portion 31 to engage or disengage. The first clutch portion 11 and the second clutch portion 31 are configured to: limit the rotation of the screw bit 30 relative to the spindle 10 when engaging with each other; and allow the screw bit 30 to rotate relative to the spindle 10 when disengaging from each other.

[0076] The nut sleeve 20 is connected to one end of the spindle 10. The connection between the nut sleeve 20 and the spindle 10 can be fixed or detachable. The nut sleeve 20 cooperates with the nut to loosen or tighten the nut. In other words, the nut sleeve 20 is used to be sleeved on the outside of the nut, and at least a portion of the inner circumference of the nut sleeve 20 fits with the outer circumference of the nut, so that the nut can be loosened or tightened when the nut sleeve 20 is sleeved on the outside of the nut.

[0077] For example, if the nut is a hexagonal nut, at least a portion of the inner circumference of the nut sleeve 20 is the same hexagonal structure as the outer circumference of the nut; if the nut is a dodecagonal nut, at least a portion of the inner circumference of the nut sleeve 20 is the same dodecagonal structure as the outer circumference of the nut; the specific structure of the inner circumference of the nut sleeve 20 can be matched according to the specific shape of the outer circumference of the nut.

[0078] The screw bit 30 is movably inserted into the nut sleeve 20 along the axial direction X of the main shaft, that is, the screw bit 30 can move along the axial direction X of the main shaft within the nut sleeve 20, so that the screw bit 30 can move closer to or farther away from the main shaft 10. The screw bit 30 cooperates with the screw rod, thereby being able to loosen or tighten the screw rod. In other words, the screw bit 30 can be inserted into the groove of the screw rod and cooperate with the screw rod. For example, the screw bit 30 can be a flat head bit, a cross head bit, a hexagonal head bit, etc. The screw bit 30 can be matched according to the specific structure of the screw rod.

[0079] The movement of the screw bit 30 along the axial direction X of the main shaft can engage or disengage the first clutch portion 11 and the second clutch portion 31, that is, when the screw bit 30 moves along the axial direction X of the main shaft toward the main shaft 10, the first clutch portions 11 can engage with each other. Conversely, when the screw bit 30 moves along the axial direction X of the main shaft toward the direction away from the main shaft 10, the first clutch portions 11 can disengage from each other.

[0080] The first clutch portion 11 and the second clutch portion 31 are configured to: limit the screw bit 30 from rotating relative to the main shaft 10 when they cooperate with each other; and allow the screw bit 30 to rotate relative to the main shaft 10 when they are separated from each other. That is to say, the first clutch portion 11 and the second clutch portion 31 can limit the screw bit 30 from rotating relative to the main shaft 10 when they cooperate with each other, so that the driving force of the main shaft 10 during the rotation process can be transmitted to the screw bit 30, so that the screw bit 30 can loosen or tighten the screw. Conversely, when the first clutch portion 11 and the second clutch portion 31 are separated from each other, the screw bit 30 can be allowed to rotate relative to the sleeve main shaft 10, so that the driving force of the main shaft 10 during the rotation process cannot be transmitted to the screw bit 30, so that the screw bit 30 cannot loosen or tighten the screw.

[0081] Optionally, the structure of the first clutch portion 11 provided on the main shaft 10 can be various. For example, referring to Figures 3 and 4, and further referring to Figures 6 and 7, Figure 6 is a structural schematic diagram of the main shaft 10 provided in some embodiments of the present application, and Figure 7 is a cross-sectional view of the main shaft 10 provided in some embodiments of the present application. In the axial direction X of the main shaft, the first clutch portion 11 is protruded at one end of the main shaft 10 facing the screw bit 30.

[0082] The first clutch 11 and the main shaft 10 can be an integrally formed structure or a separate structure. For example, in FIG7 , the first clutch 11 and the main shaft 10 are an integrally formed structure, that is, the first clutch 11 and the main shaft 10 are an integrally formed structure. The first clutch 11 and the main shaft 10 can be integrally formed by a process such as casting or milling. Of course, in other embodiments, if the first clutch 11 and the main shaft 10 are separate structures, the first clutch 11 can be connected to the main shaft 10 by a connection structure such as welding, bolting, or clamping.

[0083] Optionally, the structure of the second clutch portion 31 provided on the screw bit 30 can be various. For example, referring to Figures 3 and 4, and further referring to Figures 8 and 9, Figure 8 is a structural schematic diagram of the screw bit 30 provided in some embodiments of the present application, and Figure 9 is a cross-sectional view of the screw bit 30 provided in some embodiments of the present application. In the axial direction X of the main shaft, the second clutch portion 31 is convexly provided at one end of the screw bit 30 facing the main shaft 10.

[0084] Among them, the second clutch portion 31 and the screw bit 30 can be an integrally formed structure or a separately arranged structure. For example, in Figure 9, the second clutch portion 31 and the screw bit 30 are an integrally formed structure, that is, the second clutch portion 31 and the screw bit 30 are an integral structure. The second clutch portion 31 and the screw bit 30 can be integrally formed by a process such as casting or milling. Of course, in other embodiments, if the second clutch portion 31 and the screw bit 30 are separately arranged structures, the second clutch portion 31 can be connected to the screw bit 30 by a connection structure such as welding, bolt connection, or clamping.

[0085] It should be noted that the spindle 10 plays a role in driving the nut sleeve 20 and the screw bit 30 to rotate during the rotation process. The spindle 10 can be connected to a driving member to drive the spindle 10 to rotate through the driving member, or the spindle 10 can be driven to rotate by manually holding the spindle 10.

[0086] By connecting the nut sleeve 20 at one end of the spindle 10, the spindle 10 can drive the nut sleeve 20 to rotate synchronously to loosen or tighten the nut, and by arranging a screw bit 30 movable along the axial direction X of the spindle in the nut sleeve 20, when the screw bit 30 is moved along the axial direction X of the spindle during operation, the screw bit 30 can be moved closer to or away from the spindle 10, so that the second clutch portion 31 of the screw bit 30 can cooperate with or separate from the first clutch portion 11 of the spindle 10, thereby realizing the mutual cooperation between the first clutch portion 11 and the second clutch portion 31 When the first clutch portion 11 and the second clutch portion 31 are separated from each other, the nut bit is allowed to rotate relative to the main shaft 10, so that the main shaft 10 can drive the screw bit 30 to rotate synchronously and loosen or tighten the screw. When the first clutch portion 11 and the second clutch portion 31 are separated from each other, the nut bit is allowed to rotate relative to the main shaft 10, so that the main shaft 10 can only drive the nut sleeve 20 to operate the nut, thereby realizing different operating states of the locking and unlocking mechanism 100 to meet different operating requirements, which is conducive to improving the applicability of the locking and unlocking mechanism 100. In addition, the structure and operation of the locking and unlocking mechanism 100 are relatively simple and occupy less space.

[0087] In some embodiments, referring to Figures 3, 4 and 5, along the axial direction X of the main shaft, the first clutch portion 11 is protruded from one end of the main shaft 10 facing the screw bit 30, and the second clutch portion 31 is protruded from one end of the screw bit 30 facing the main shaft 10, and the second clutch portion 31 is arranged opposite to the first clutch portion 11.

[0088] The second clutch portion 31 is arranged opposite to the first clutch portion 11 , that is, the second clutch portion 31 and the first clutch portion 11 are arranged facing each other in the axial direction X of the main shaft.

[0089] By protruding the first clutch portion 11 at the end of the main shaft 10 facing the screw bit 30, and protruding the second clutch portion 31 at the end of the screw bit 30 facing the main shaft 10, the first clutch portion 11 and the second clutch portion 31 can be arranged relative to each other in the axial direction X of the main shaft, thereby reducing the difficulty of the first clutch portion 11 and the second clutch portion 31 to cooperate or separate with each other when the screw bit 30 moves along the axial direction X of the main shaft, so that the first clutch portion 11 and the second clutch portion 31 can cooperate or separate with each other, and the structure is simple and easy to manufacture.

[0090] According to some embodiments of the present application, referring to Figures 4, 6, 7, 8 and 9, along the axial direction X of the main shaft, a first tooth-shaped portion 111 is formed at one end of the first clutch portion 11 facing the second clutch portion 31, and a second tooth-shaped portion 311 is formed at one end of the second clutch portion 31 facing the first clutch portion 11. The second tooth-shaped portion 311 is used to engage with the first tooth-shaped portion 111 to achieve cooperation between the first clutch portion 11 and the second clutch portion 31.

[0091] The first toothed portion 111 is a toothed structure disposed on the end of the first clutch portion 11 facing the second clutch portion 31. The first teeth of the first toothed portion 111 are arranged circumferentially around the first clutch portion 11, with each first tooth extending radially along the first clutch portion 11. The second toothed portion 311 is a toothed structure disposed on the end of the second clutch portion 31 facing the first clutch portion 11. The second teeth of the second toothed portion 311 are arranged circumferentially around the second clutch portion 31, with each second tooth extending radially along the second clutch portion 31. When the screw bit 30 drives the second clutch portion 31 to move along the axial direction X of the spindle and approach the first clutch portion 11, the second toothed portion 311 and the first toothed portion 111 can mesh with each other, thereby achieving mutual cooperation between the second clutch portion 31 and the first clutch portion 11 to restrict rotation of the screw bit 30 relative to the spindle 10.

[0092] It should be noted that, in other embodiments, the first clutch portion 11 and the second clutch portion 31 may also have other structures. For example, the first clutch portion 11 is provided with a limiting hole at one end facing the second clutch portion 31 in the axial direction X of the main shaft, and the second clutch portion 31 is provided with a latch at one end facing the first clutch portion 11 in the axial direction X of the main shaft. When the screw bit 30 drives the second clutch portion 31 to move along the axial direction X of the main shaft and approaches the first clutch portion 11, the latch can be inserted into the limiting hole to achieve mutual cooperation between the second clutch portion 31 and the first clutch portion 11, thereby limiting the rotation of the screw bit 30 relative to the main shaft 10. Of course, the limiting block can also be provided on the second clutch portion 31, and correspondingly, the first clutch portion 11 is provided with a latch.

[0093] In some embodiments, as shown in Figures 6 and 7 , a first groove 112 is provided at one end of the first clutch portion 11 facing the second clutch portion 31, and a plurality of first teeth of the first toothed portion 111 are arranged around the first groove 112 along the circumference of the first clutch portion 11. A first clutch portion 11 employing such a structure can reduce the difficulty of disposing the first toothed portion 111 on the first clutch portion 11, can reduce interference between the plurality of first teeth of the first toothed portion 111, and can facilitate mutual engagement between the first toothed portion 111 and the second toothed portion 311, thereby reducing the difficulty of mutual engagement between the first toothed portion 111 and the second toothed portion 311.

[0094] In some embodiments, as shown in Figures 8 and 9 , a second groove 312 is provided at one end of the second clutch portion 31 facing the first clutch portion 11, and a plurality of second teeth of the second toothed portion 311 are arranged around the second groove 312 along the circumference of the second clutch portion 31. The second clutch portion 31 employing such a structure can reduce the difficulty of providing the second toothed portion 311 on the second clutch portion 31, can reduce interference between the plurality of second teeth of the second toothed portion 311, and can facilitate the mutual engagement of the second toothed portion 311 with the first toothed portion 111, thereby reducing the difficulty of the mutual engagement of the second toothed portion 311 with the first toothed portion 111.

[0095] By providing a first toothed portion 111 at one end of the first clutch portion 11 facing the second clutch portion 31, and correspondingly providing a second toothed portion 311 at one end of the second clutch portion 31 facing the first clutch portion 11, the screw bit 30 can be driven to engage or disengage with the second toothed portion 311 when moving in the axial direction X of the spindle, thereby achieving the cooperation or separation of the second clutch portion 31 and the first clutch portion 11, so that when the first toothed portion 111 and the second toothed portion 311 are engaged with each other, the screw bit 30 can be restricted from rotating relative to the spindle 10. The structure is simple and easy to implement. In addition, by providing the first toothed portion 111 and the second toothed portion 311 on the first clutch portion 11 and the second clutch portion 31, respectively, the difficulty of cooperation and separation of the first clutch portion 11 and the second clutch portion 31 can be effectively reduced, which is conducive to the cooperation or separation of the first clutch portion 11 and the second clutch portion 31.

[0096] According to some embodiments of the present application, as shown in Figures 2, 3, and 4, the locking and unlocking mechanism 100 may further include an elastic member 40. The elastic member 40 is disposed between the main shaft 10 and the screw bit 30 along the axial direction X of the main shaft. The elastic member 40 is configured to drive the screw bit 30 to move away from the main shaft 10 to separate the first clutch portion 11 and the second clutch portion 31.

[0097] Among them, the elastic member 40 is arranged between the main shaft 10 and the screw bit 30 along the axial direction X of the main shaft, so that the elastic member 40 can provide an elastic force for the screw bit 30, so that the screw bit 30 has a tendency to move in the direction away from the main shaft 10 in the axial direction X of the main shaft, so that in actual use, it is only necessary for the main shaft 10 to press the screw bit 30 in the direction close to the screw to realize that the screw bit 30 drives the second clutch portion 31 and the first clutch portion 11 to cooperate with each other, so that the main shaft 10 can transmit the driving force to the screw bit 30 to loosen or tighten the screw. Conversely, after the operation of the screw is completed, it is only necessary to cancel the force for pressing the screw bit 30, so that the screw bit 30 can be moved away from the main shaft 10 along the axial direction X of the main shaft under the elastic force of the elastic member 40, so as to realize the separation of the first clutch portion 11 and the second clutch portion 31.

[0098] Optionally, the elastic member 40 may have various structures. For example, the elastic member 40 may be a spring, a spring sheet, or an elastic rubber, etc., disposed between the spindle 10 and the screw bit 30. For example, in FIG4 , the elastic member 40 is a spring, and one end of the spring close to the spindle 10 is sleeved on the outside of the first clutch portion 11 and abuts against the end of the spindle 10 facing the screw bit 30. The other end of the spring close to the screw bit 30 is sleeved on the outside of the second clutch portion 31 and abuts against the end of the screw bit 30 facing the spindle 10.

[0099] It should be noted that the structure of the elastic member 40 arranged between the main shaft 10 and the screw bit 30 can be various. For example, the elastic member 40 can be directly abutted against the main shaft 10 and the screw bit 30 at both ends, or it can be indirectly abutted against the main shaft 10 and the screw bit 30, that is, the elastic member 40 abuts against the main shaft 10 and the screw bit 30 through other components.

[0100] The locking and unlocking mechanism 100 is further provided with an elastic member 40, which is arranged between the main shaft 10 and the screw bit 30 in the axial direction X of the main shaft, so that the screw bit 30 can be driven to move away from the main shaft 10 by the elastic force of the elastic member 40, so that the first clutch portion 11 and the second clutch portion 31 can be separated. The locking and unlocking mechanism 100 with such a structure can, on the one hand, reduce the phenomenon of mismatching between the first clutch portion 11 and the second clutch portion 31 when the screw bit 30 is not pressed down, which is conducive to improving the stability and reliability of the locking and unlocking mechanism 100. On the other hand, after the first clutch portion 11 and the second clutch portion 31 cooperate with each other, the first clutch portion and the second clutch portion can be automatically separated by the elastic member 40, without manual participation, which is convenient for operation and use.

[0101] According to some embodiments of the present application, referring to Figures 2, 3 and 4, the locking and unlocking mechanism 100 may further include a first stop 50 and a second stop 60, the first stop 50 being arranged on the main shaft 10, the second stop 60 being arranged on the screw bit 30, and along the axial direction X of the main shaft, the two ends of the elastic member 40 abut against the first stop 50 and the second stop 60, respectively.

[0102] The two ends of the elastic member 40 abut against the first stopper 50 and the second stopper 60 respectively, that is, the two ends of the elastic member 40 indirectly abut against the main shaft 10 and the screw bit 30 respectively through the first stopper 50 and the second stopper 60 .

[0103] The connection structure between the first stopper 50 and the main shaft 10 can be various, such as abutment, welding or bonding, etc. Similarly, the connection structure between the second stopper 60 and the screw bit 30 can also be various, such as abutment, welding or bonding, etc.

[0104] The locking and unlocking mechanism 100 is further provided with a first stop 50 and a second stop 60. By respectively arranging the first stop 50 and the second stop 60 on the main shaft 10 and the screw bit 30, and the two ends of the elastic member 40 respectively abut against the first stop 50 and the second stop 60, so as to realize that the elastic member 40 is arranged between the main shaft 10 and the screw bit 30 in the axial direction X of the main shaft. The locking and unlocking mechanism 100 with such a structure is conducive to reducing the difficulty of assembling the elastic member 40 between the main shaft 10 and the screw bit 30, and can reduce the wear caused by the elastic member 40 to the main shaft 10 and the screw bit 30, which is conducive to improving the service life of the main shaft 10 and the screw bit 30.

[0105] According to some embodiments of the present application, referring to Figures 3 and 4, the first stopper 50 may include a first abutting portion 51 and a first protrusion 52 connected to each other. Along the axial direction X of the main shaft, the first abutting portion 51 abuts against one end of the main shaft 10 facing the screw bit 30, and the first protrusion 52 is protruded on the side of the first abutting portion 51 away from the main shaft 10. One end of the elastic member 40 away from the screw bit 30 abuts against the first abutting portion 51, and a portion of the elastic member 40 is sleeved on the outside of the first protrusion 52.

[0106] The end of the elastic member 40 away from the screw bit 30 abuts against the first abutment portion 51 , that is, the end of the elastic member 40 close to the main shaft 10 indirectly abuts against the main shaft 10 through the first abutment portion 51 of the first stopper 50 .

[0107] Part of the elastic member 40 is sleeved on the outside of the first protruding portion 52 , that is, the first protruding portion 52 is inserted into the elastic member 40 .

[0108] Optionally, the first abutment portion 51 and the first protrusion portion 52 can be an integrally formed structure or a separately arranged structure. For example, in Figure 4, the first abutment portion 51 and the first protrusion portion 52 are an integrally formed structure, that is, the first abutment portion 51 and the first protrusion portion 52 are an integral structure. The first abutment portion 51 and the first protrusion portion 52 can be made by an integral forming process such as casting or stamping.

[0109] The first stopper 50 is provided with a first abutting portion 51 and a first protruding portion 52. The first abutting portion 51 abuts against one end of the main shaft 10, and the first protruding portion 52 protrudes from the side of the first abutting portion 51 away from the main shaft 10, so that one end of the elastic member 40 can be indirectly abutted against the main shaft 10 by the structure abutting against the first abutting portion 51, and by partially sleeved on the outside of the first protruding portion 52, the structural stability of the elastic member 40 assembled between the main shaft 10 and the screw bit 30 can be effectively improved, which is conducive to alleviating the phenomenon of the elastic member 40 falling off, and the first protruding portion 52 can also play a certain guiding role when the elastic member 40 is compressed, so as to improve the stability of the elastic member 40 during the compression process.

[0110] In some embodiments, please continue to refer to Figures 3 and 4 , along the axial direction X of the main shaft, the first clutch portion 11 is protruded from one end of the main shaft 10 facing the screw bit 30 , and the first stopper 50 is sleeved on the outer side of the first clutch portion 11 .

[0111] The first stopper 50 is sleeved on the outside of the first clutch portion 11, that is, the first stopper 50 is an annular structure disposed around the first clutch portion 11. That is, in the embodiment where the first stopper 50 includes the first abutting portion 51 and the first protruding portion 52, both the first abutting portion 51 and the first protruding portion 52 are annular structures surrounding the outside of the first clutch portion 11. For example, in FIG4 , the first abutting portion 51 and the first protruding portion 52 are perpendicular to each other, so that the cross-section of the first abutting portion 51 and the first protruding portion 52 forms an "L"-shaped structure.

[0112] By protruding the first clutch portion 11 at the end of the main shaft 10 facing the screw bit 30, and sleeved on the outside of the first clutch portion 11, the locking and unlocking mechanism 100 with such a structure can, on the one hand, improve the structural stability of the first stop block 50 set on the main shaft 10, so as to improve the structural stability of the elastic member 40 assembled between the main shaft 10 and the screw bit 30, and on the other hand, facilitate the first clutch portion 11 to cooperate with the second clutch portion 31 after the elastic member 40 is compressed, which is conducive to reducing the difficulty of the first clutch portion 11 and the second clutch portion 31 to cooperate with each other.

[0113] According to some embodiments of the present application, referring to Figures 3 and 4, the second stopper 60 may include a second abutting portion 61 and a second protrusion 62 connected to each other. Along the axial direction X of the main shaft, the second abutting portion 61 abuts against one end of the screw bit 30 facing the main shaft 10, and the second protrusion 62 is convexly arranged on the side of the second abutting portion 61 away from the screw bit 30. The end of the elastic member 40 away from the main shaft 10 abuts against the second abutting portion 61, and a portion of the elastic member 40 is sleeved on the outside of the second protrusion 62.

[0114] The end of the elastic member 40 away from the main shaft 10 abuts against the second abutting portion 61 , that is, the end of the elastic member 40 close to the screw bit 30 indirectly abuts against the screw bit 30 through the second abutting portion 61 of the second stopper 60 .

[0115] Part of the elastic member 40 is sleeved on the outer side of the second protruding portion 62 , that is, the second protruding portion 62 is inserted into the elastic member 40 .

[0116] Optionally, the second abutment portion 61 and the second protrusion portion 62 can be an integrally formed structure or a separately arranged structure. For example, in Figure 4, the second abutment portion 61 and the second protrusion portion 62 are an integrally formed structure, that is, the second abutment portion 61 and the second protrusion portion 62 are an integral structure. The second abutment portion 61 and the second protrusion portion 62 can be made by an integral forming process such as casting or stamping.

[0117] The second stopper 60 is provided with a second abutment portion 61 and a second protrusion 62. The second abutment portion 61 abuts against one end of the screw bit 30, and the second protrusion 62 protrudes from the side of the second abutment portion 61 away from the screw bit 30, so that one end of the elastic member 40 can indirectly abut against the screw bit 30 through the structure abutting against the second abutment portion 61, and by partially sleeved on the outside of the second protrusion 62, the structural stability of the elastic member 40 assembled between the screw bit 30 and the spindle 10 can be effectively improved, which is conducive to alleviating the phenomenon of the elastic member 40 falling off, and the second protrusion 62 can also play a certain guiding role when the elastic member 40 is compressed, so as to improve the stability of the elastic member 40 during the compression process.

[0118] In some embodiments, please continue to refer to Figures 3 and 4 , along the axial direction X of the main shaft, the second clutch portion 31 is protruded from one end of the screw bit 30 facing the main shaft 10 , and the second stopper 60 is sleeved on the outer side of the second clutch portion 31 .

[0119] The second stopper 60 is sleeved on the outside of the second clutch portion 31, that is, the second stopper 60 is an annular structure arranged around the second clutch portion 31. In other words, in the embodiment where the second stopper 60 includes the second abutting portion 61 and the second protruding portion 62, the second abutting portion 61 and the second protruding portion 62 are both annular structures surrounding the outside of the second clutch portion 31. For example, in FIG4 , the second abutting portion 61 and the second protruding portion 62 are perpendicular to each other, so that the cross-section of the second abutting portion 61 and the second protruding portion 62 forms an "L"-shaped structure.

[0120] By protruding the second clutch portion 31 at the end of the screw bit 30 facing the main shaft 10, and sleeved the second stop block 60 on the outside of the second clutch portion 31, the locking and unlocking mechanism 100 with such a structure can, on the one hand, improve the structural stability of the second stop block 60 provided on the screw bit 30, thereby improving the structural stability of the elastic member 40 assembled between the main shaft 10 and the screw bit 30, and on the other hand, facilitate the second clutch portion 31 to cooperate with the first clutch portion 11 after the elastic member 40 is compressed, which is conducive to reducing the difficulty of the second clutch portion 31 and the first clutch portion 11 to cooperate with each other.

[0121] According to some embodiments of the present application, referring to Figures 5 and 9, and further referring to Figures 10 and 11, Figure 10 is a schematic structural diagram of a nut sleeve 20 provided in some embodiments of the present application, and Figure 11 is a cross-sectional view of a nut sleeve 20 provided in some embodiments of the present application. A limiting protrusion 21 is convexly provided on the inner circumferential surface of the nut sleeve 20. Along the axial direction X of the main shaft, the screw bit 30 has an abutment surface 32 facing the limiting protrusion 21. The abutment surface 32 is closer to the main shaft 10 than the limiting protrusion 21, and at least a portion of the projection of the limiting protrusion 21 is located within the abutment surface 32.

[0122] Among them, the screw bit 30 has an abutment surface 32 facing the limiting protrusion 21, and the abutment surface 32 is closer to the main shaft 10 than the limiting protrusion 21. That is to say, the screw bit 30 is provided with an abutment surface 32 facing the limiting protrusion 21, and the abutment surface 32 is located on the side of the limiting protrusion 21 facing the main shaft 10 in the axial direction X of the main shaft.

[0123] At least part of the projection of the limiting protrusion 21 is located within the abutment surface 32, that is, in the axial direction X of the main shaft, the limiting protrusion 21 has an area that overlaps with the abutment surface 32, and the abutment surface 32 can abut against the limiting protrusion 21 during the movement of the screw bit 30 along the axial direction X of the main shaft.

[0124] The locking cam 32 is located on the side of the locking cam 32 facing the locking cam 31 and the locking cam 32 is located on the side of the locking cam 32 facing the locking cam 31.

[0125] In some embodiments, as shown in Figures 5, 8, and 9, a screw driver bit 30 may include a movable portion 33 and a bit body 34. The movable portion 33 is movably disposed within the nut sleeve 20 along the axial direction X of the spindle. The second clutch portion 31 is protruding from the end of the movable portion 33 facing the spindle 10. Along the axial direction X of the spindle, the side of the movable portion 33 facing away from the spindle 10 forms an abutment surface 32. The bit body 34 is connected to the abutment surface 32 and is configured to engage with the screw.

[0126] Among them, the second clutch portion 31 is convexly provided at one end of the moving portion 33 facing the spindle 10, and the side of the moving portion 33 away from the second clutch portion 31 forms an abutment surface 32, and the bit body 34 is connected to the abutment surface 32, that is, the second clutch portion 31 and the bit body 34 are respectively connected to the surfaces on both sides of the moving portion 33 in the axial direction X of the spindle, and the surface of the moving portion 33 away from the spindle 10 is the abutment surface 32, so that the side of the moving portion 33 away from the spindle 10 is used to abut against the limiting protrusion 21.

[0127] The bit body 34 is used to cooperate with the screw, that is, the bit body 34 cooperates with the screw, so as to loosen or tighten the screw. In other words, the bit body 34 can be inserted into the groove of the screw and cooperate with the screw. For example, the bit body 34 can be a flathead bit, a cross bit or a hexagonal bit, etc. The bit body 34 can be matched according to the specific structure of the screw.

[0128] Exemplarily, in FIG. 9 , the radial dimension of the second clutch portion 31 and the radial dimension of the bit body 34 are both smaller than the radial dimension of the moving portion 33 .

[0129] The screw bit 30 is provided with a movable portion 33 and a bit body 34. The movable portion 33 is movably disposed within the nut sleeve 20 in the axial direction X of the spindle, and an abutment surface 32 is formed on the side of the movable portion 33 facing away from the spindle 10. This facilitates the nut bit to abut against the limiting protrusion 21 via the movable portion 33, thereby realizing the limiting function of the limiting protrusion 21 on the screw bit 30. The bit body 34 is also conveniently connected to the abutment surface 32 of the movable portion 33, which facilitates the engagement of the bit body 34 with the screw. In addition, by protruding the second clutch portion 31 on the side of the movable portion 33 facing away from the bit body 34, the movable portion 33 can drive the second clutch portion 31 toward the spindle 10 during the downward pressure of the bit body 34 using the locking and unlocking mechanism 100, thereby reducing the difficulty of the second clutch portion 31 engaging with the first clutch portion 11 of the spindle 10.

[0130] According to some embodiments of the present application, referring to FIG. 5 and FIG. 11 , the limiting protrusion 21 is an annular structure disposed around the bit body 34 .

[0131] Among them, the limiting protrusion 21 is an annular structure arranged around the bit body 34, that is, the limiting protrusion 21 surrounds the outside of the bit body 34, that is, the limiting protrusion 21 is an annular structure, and the bit body 34 is passed through the center hole of the limiting protrusion 21 of the annular structure.

[0132] In Figures 5 and 11, the limiting protrusion 21 is configured to divide the internal space of the nut sleeve 20 into a first chamber 22 and a second chamber 23. Along the axial direction X of the main shaft, the first chamber 22 is closer to the main shaft 10 than the second chamber 23. The movable portion 33 is movably arranged in the first chamber 22 along the axial direction X of the main shaft. The cavity wall surface of the second chamber 23 fits with the outer peripheral surface of the nut, so that the cavity wall surface of the second chamber 23 can cooperate with the nut to loosen or tighten the nut.

[0133] Exemplarily, the outer peripheral surface of the movable part 33 fits and abuts against the cavity wall surface of the first chamber 22, so that the cavity wall surface of the first chamber 22 can provide a guiding function for the movable part 33, thereby improving the stability of the movable part 33 moving along the axial direction X of the main axis in the first chamber 22.

[0134] By setting the limiting protrusion 21 as an annular structure and surrounding the outer side of the bit body 34, the effect of the limiting protrusion 21 for the abutment surface 32 of the movable portion 33 can be further improved, thereby improving the limiting effect of the limiting protrusion 21 on the movable portion 33 of the screw bit 30, thereby further reducing the risk of the screw bit 30 disengaging from the sleeve in the direction away from the spindle 10 in the axial direction X of the spindle, which is beneficial to improving the stability of the locking and unlocking mechanism 100.

[0135] According to some embodiments of the present application, as shown in Figures 2, 4, 6, and 7, the spindle 10 may include a main body 12 and a plug-in portion 13. Along the axial direction X of the spindle, the plug-in portion 13 is protruding from the end of the main body 12 facing the screw bit 30, and the first clutch portion 11 is protruding from the end of the plug-in portion 13 facing away from the main body 12. Along the axial direction X of the spindle, the plug-in portion 13 is inserted into the nut sleeve 20, and the end of the nut sleeve 20 closer to the main body 12 abuts against the main body 12.

[0136] Among them, the plug-in portion 13 is protruded from the end of the main body 12 facing the screw bit 30, so that a step surface is formed between the outer peripheral surface of the plug-in portion 13 and the end surface of the main body 12 facing the plug-in portion 13, so that after the plug-in portion 13 is inserted into the nut sleeve 20, the end of the nut sleeve 20 close to the main body 12 can be abutted against the end surface of the main body 12 where the plug-in portion 13 is set.

[0137] Optionally, the main body 12 and the plug-in portion 13 may be integrally formed or may be separate structures. For example, in FIG7 , the main body 12 and the plug-in portion 13 are integrally formed, i.e., the main body 12 and the plug-in portion 13 are integrally formed. The main body 12 and the plug-in portion 13 may be integrally formed by casting or milling. Of course, in other embodiments, if the main body 12 and the plug-in portion 13 are separate structures, the plug-in portion 13 may be connected to the main body 12 by welding, bolting, or clamping.

[0138] The first clutch portion 11 is protruding from one end of the plug-in portion 13 away from the main body portion 12, that is, in the axial direction X of the main shaft. The first clutch portion 11, the plug-in portion 13 and the main body portion 12 are arranged in sequence, and the first clutch portion 11 and the main body portion 12 are respectively connected to both sides of the plug-in portion 13.

[0139] By protruding a plug-in portion 13 at one end of the main body 12 of the main shaft 10, and the plug-in portion 13 is inserted into the nut sleeve 20, the end of the nut sleeve 20 close to the main body 12 can be abutted against the main body 12. On the one hand, it can play a positioning and limiting role on the nut sleeve 20 in the axial direction X of the main shaft, so as to reduce the axial movement of the nut sleeve 20 relative to the main shaft 10. On the other hand, by mutually plugging the plug-in portion 13 of the main shaft 10 and the nut sleeve 20, it is convenient to connect the nut sleeve 20 to the main shaft 10, which is beneficial to reduce the assembly difficulty of the nut sleeve 20 connected to one end of the main shaft 10.

[0140] In some embodiments, the plug-in portion 13 is interference-fitted with the nut sleeve 20. Of course, in other embodiments, the connection structure between the main shaft 10 and the nut sleeve 20 can also be other structures, for example, the plug-in portion 13 and the nut sleeve 20 can be welded, bolted, etc., or the main body 12 and the nut sleeve 20 can be welded, bolted, etc.

[0141] By setting the plug-in portion 13 and the nut sleeve 20 to an interference fit structure, the nut sleeve 20 is connected to the main shaft 10, which has a simple structure and is easy to implement.

[0142] According to some embodiments of the present application, referring to Figures 2, 6 and 10, the plug-in portion 13 is provided with a first circumferential limiting portion 131, and the nut sleeve 20 is provided with a second circumferential limiting portion 24, which cooperates with the first circumferential limiting portion 131 to limit the rotation of the nut sleeve 20 relative to the main shaft 10.

[0143] Among them, the first circumferential limit portion 131 is arranged on the outer circumferential surface of the plug-in portion 13, and the second circumferential limit portion 24 is arranged on the end of the nut sleeve 20 close to the main body 12. The first circumferential limit portion 131 and the second circumferential limit portion 24 cooperate to limit the circumferential rotation of the nut sleeve 20 relative to the main shaft 10, so that the main shaft 10 can synchronously drive the nut sleeve 20 to rotate when rotating, so as to loosen or tighten the nut.

[0144] By providing a first circumferential limit portion 131 on the plug-in portion 13 and correspondingly providing a second circumferential limit portion 24 on the nut sleeve 20 to cooperate with the first circumferential limit portion 131, circumferential locking between the nut sleeve 20 and the main shaft 10 can be achieved, so that the main shaft 10 drives the nut sleeve 20 to rotate, which is beneficial to reducing the sliding of the nut sleeve 20 relative to the main shaft 10 during the process of the main shaft 10 driving the nut sleeve 20 to rotate.

[0145] In some embodiments, please continue to refer to Figures 2, 6 and 10. The first circumferential limiting portion 131 is a latching protrusion arranged on the outer circumferential surface of the plug-in portion 13, and the second circumferential limiting portion 24 is a latching groove arranged at one end of the nut sleeve 20 abutting against the main body 12, and the latching protrusion is locked in the latching groove.

[0146] Among them, the first circumferential limiting portion 131 is a locking protrusion protruding from the outer circumferential surface of the plug-in portion 13, and correspondingly, the second circumferential limiting portion 24 is a locking groove provided on the end face of one end of the nut sleeve 20 abutting against the main body 12. By locking the locking protrusion in the locking groove, the nut sleeve 20 can be circumferentially locked relative to the main shaft 10.

[0147] For example, in FIG. 10 , the second circumferential limiting portion 24 of the slot structure passes through the inner and outer circumferential surfaces of the nut sleeve 20 , thereby facilitating the engagement of the protrusion in the slot and facilitating processing of the slot.

[0148] Optionally, the number of the first circumferential limiting portion 131 provided on the plug-in portion 13 and the second circumferential limiting portion 24 provided on the nut sleeve 20 can be one or more. For example, in FIG6 , two first circumferential limiting portions 131 are provided on the plug-in portion 13, and the two first circumferential limiting portions 131 are arranged at intervals along the circumference of the plug-in portion 13. Correspondingly, two second circumferential limiting portions 24 are provided on the end face of one end of the nut sleeve 20 abutting against the main body 12, and the second circumferential limiting portions 24 correspond one-to-one with the first circumferential limiting portions 131. Of course, in other embodiments, the number of the first circumferential limiting portions 131 and the second circumferential limiting portions 24 can also be three, four, five or six, etc.

[0149] It should be noted that, in other embodiments, the first circumferential limiting portion 131 and the second circumferential limiting portion 24 can also be other structures. For example, the first circumferential limiting portion 131 is a card groove arranged on the outer circumferential surface of the plug-in portion 13, and correspondingly, the second circumferential limiting portion 24 is a card protrusion protruding on the inner circumferential surface of the nut sleeve 20, and the card protrusion is locked in the card groove.

[0150] By setting the first circumferential limit portion 131 as a latching protrusion provided on the outer circumferential surface of the plug-in portion 13, and correspondingly setting the second circumferential limit portion 24 as a latching groove provided on one end of the nut sleeve 20 abutting against the main body 12, it is convenient to lock the latching protrusion in the latching groove to achieve the cooperation between the first circumferential limit portion 131 and the second circumferential limit portion 24, and the latching protrusion is locked in the latching groove to achieve circumferential locking between the nut sleeve 20 and the main shaft 10. The structure is simple and easy to implement and manufacture.

[0151] According to some embodiments of the present application, the present application also provides an electric screwdriver, which includes a driving member and a locking and unlocking mechanism 100 of any of the above schemes, wherein the driving member is connected to the main shaft 10 and is configured to drive the main shaft 10 to rotate.

[0152] The output end of the driving member is used to be connected to an end of the main shaft 10 that is away from the screw bit 30 in the axial direction X of the main shaft, so that the driving member drives the main shaft 10 to rotate.

[0153] For example, the structure of the driving member can be various, such as an electric motor or a hydraulic motor.

[0154] By connecting the main shaft 10 with the driving member, the driving member can drive the main shaft 10 to rotate, thereby driving the nut sleeve 20 and the screw bit 30 to rotate, so as to realize automatic loosening or tightening of the nut or screw, which is conducive to reducing manual participation and thus improving the operating efficiency of the locking and unlocking mechanism 100.

[0155] According to some embodiments of the present application, the present application further provides a lock changing device, which includes a lock changing platform and an electric screwdriver according to any of the above solutions, and a driving member is installed on the lock changing platform.

[0156] The driving member is installed on the lock changing platform, and can be fixed on the lock changing platform, for example, by welding or bonding, or can be detachably installed on the lock changing platform, for example, by bolting or clamping.

[0157] In some embodiments, the lock changing device may further include a traveling mechanism, the lock changing platform is mounted on the traveling mechanism, and the traveling mechanism is configured to drive the lock changing platform to move.

[0158] The traveling mechanism drives the lock changing platform to move. The traveling mechanism can be of various structures, such as an automated guided vehicle (AGV). It should be noted that in other embodiments, the lock changing device may not be provided with a traveling mechanism, and the lock changing platform may be fixed on the ground.

[0159] By installing the lock changing platform on the walking mechanism, the walking mechanism can drive the electric screwdriver arranged on the lock changing platform to move, so that the electric screwdriver can be operated in different scenes.

[0160] According to some embodiments of the present application, as shown in Figures 1 to 11, the present application provides a locking and unlocking mechanism 100, which includes a main shaft 10, a nut sleeve 20, a screw bit 30, an elastic member 40, a first stopper 50, and a second stopper 60. The main shaft 10 includes a main body 12 and a plug-in portion 13. Along the axial direction X of the main shaft, the plug-in portion 13 is protruding from one end of the main body 12, and the outer circumferential surface of the plug-in portion 13 is provided with a first circumferential limit portion 131. The first circumferential limit portion 131 is a locking protrusion protruding from the outer circumferential surface of the plug-in portion 13. One end of the nut sleeve 20 abuts against the end of the main body 12 provided with the plug-in portion 13, and the plug-in portion 13 is inserted into the nut sleeve 20. The plug-in portion 13 and the nut sleeve 20 have an interference fit, and the nut sleeve 20 is used to cooperate with the nut. The nut sleeve 20 is provided with a second circumferential limit portion 24, which is a slot provided at one end of the nut sleeve 20 that abuts the main body 12. The locking protrusion is locked in the slot to cooperate and limit the rotation of the nut sleeve 20 relative to the spindle 10. The screw bit 30 includes a movable portion 33 and a bit body 34. The movable portion 33 is movably provided in the nut sleeve 20 along the axial direction X of the spindle. Along the axial direction X of the spindle, the side of the movable portion 33 facing away from the spindle 10 forms an abutment surface 32. The bit body 34 is connected to the abutment surface 32 and is used to cooperate with the screw. A limiting protrusion 21 is convexly provided on the inner circumferential surface of the nut sleeve 20. Along the axial direction X of the main shaft, the abutment surface 32 is arranged facing the limiting protrusion 21. The abutment surface 32 is closer to the main shaft 10 than the limiting protrusion 21, and at least part of the projection of the limiting protrusion 21 is located within the abutment surface 32. The limiting protrusion 21 is an annular structure arranged around the bit body 34. A first clutch portion 11 is protruding from one end of the plug-in portion 13 facing away from the main body 12, and a second clutch portion 31 is protruding from one end of the movable portion 33 facing away from the abutting surface 32. Along the axial direction X of the spindle, the second clutch portion 31 and the first clutch portion 11 are arranged opposite each other. Movement of the screw bit 30 along the axial direction X of the spindle enables the first clutch portion 11 and the second clutch portion 31 to engage or disengage. The first clutch portion 11 and the second clutch portion 31 are configured to: restrict rotation of the screw bit 30 relative to the spindle 10 when engaged with each other; and allow rotation of the screw bit 30 relative to the spindle 10 when disengaged. Along the axial direction X of the spindle, a first toothed portion 111 is formed on the end of the first clutch portion 11 facing the second clutch portion 31, and a second toothed portion 311 is formed on the end of the second clutch portion 31 facing the first clutch portion 11. The second toothed portion 311 is configured to engage with the first toothed portion 111 to achieve engagement between the first clutch portion 11 and the second clutch portion 31. The elastic member 40 is disposed between the main shaft 10 and the screw bit 30 along the main shaft axial direction X. The elastic member 40 is configured to drive the screw bit 30 to move away from the main shaft 10 to separate the first clutch portion 11 and the second clutch portion 31 .The first stopper 50 is an annular structure arranged around the first clutch portion 11. The first stopper 50 includes a first abutting portion 51 and a first protruding portion 52 that are connected to each other. Along the axial direction X of the main shaft, the first abutting portion 51 abuts against one end of the main shaft 10 facing the screw bit 30, and the first protruding portion 52 is protruding on the side of the first abutting portion 51 away from the main shaft 10. The end of the elastic member 40 away from the screw bit 30 abuts against the first abutting portion 51, and a portion of the elastic member 40 is sleeved on the outside of the first protruding portion 52. The second stopper 60 is an annular structure arranged around the second clutch portion 31. The second stopper 60 includes a second abutting portion 61 and a second protruding portion 62 connected to each other. Along the axial direction X of the main shaft, the second abutting portion 61 abuts against one end of the screw bit 30 facing the main shaft 10, and the second protruding portion 62 is protruding on the side of the second abutting portion 61 away from the screw bit 30. The end of the elastic member 40 away from the main shaft 10 abuts against the second abutting portion 61, and a portion of the elastic member 40 is sleeved on the outside of the second protruding portion 62.

[0161] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0162] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A locking and unlocking mechanism, comprising: Spindle; A nut sleeve connected to one end of the main shaft, the nut sleeve being used to cooperate with a nut; as well as A screw driver bit is inserted into the nut sleeve movably along the axial direction of the main shaft, and the screw driver bit is used to cooperate with the screw; The spindle is provided with a first clutch portion, and the screw bit is provided with a second clutch portion. The axial movement of the screw bit along the spindle can make the first clutch portion and the second clutch portion engage or separate. The first clutch portion and the second clutch portion are configured to: limit the rotation of the screw bit relative to the spindle when engaging with each other; and allow the screw bit to rotate relative to the spindle when separating from each other.

2. The locking and unlocking mechanism according to claim 1, wherein: Along the axial direction of the main shaft, the first clutch portion is protruded from one end of the main shaft facing the screw bit, the second clutch portion is protruded from one end of the screw bit facing the main shaft, and the second clutch portion is arranged opposite to the first clutch portion.

3. The locking and unlocking mechanism according to claim 2, wherein: Along the axial direction of the main shaft, a first tooth-shaped portion is formed at one end of the first clutch portion facing the second clutch portion, and a second tooth-shaped portion is formed at one end of the second clutch portion facing the first clutch portion, and the second tooth-shaped portion is used to engage with the first tooth-shaped portion to achieve cooperation between the first clutch portion and the second clutch portion.

4. The locking and unlocking mechanism according to any one of claims 1 to 3, wherein: The locking and unlocking mechanism also includes: An elastic member is arranged between the main shaft and the screw bit along the axial direction of the main shaft, and the elastic member is configured to drive the screw bit to move away from the main shaft so as to separate the first clutch part and the second clutch part.

5. The locking and unlocking mechanism according to claim 4, wherein: The locking and unlocking mechanism further includes a first stopper and a second stopper, wherein the first stopper is arranged on the main shaft, and the second stopper is arranged on the screw bit, and along the axial direction of the main shaft, two ends of the elastic member abut against the first stopper and the second stopper respectively.

6. The locking and unlocking mechanism according to claim 5, wherein: The first stopper includes a first abutting portion and a first protruding portion that are connected to each other. Along the axial direction of the main shaft, the first abutting portion abuts against one end of the main shaft facing the screw bit, and the first protruding portion is protruding from a side of the first abutting portion away from the main shaft. One end of the elastic member away from the screw bit abuts against the first abutting portion, and a portion of the elastic member is sleeved on the outside of the first protruding portion.

7. The locking and unlocking mechanism according to claim 5 or 6, wherein: Along the axial direction of the main shaft, the first clutch portion is protrudingly arranged at one end of the main shaft facing the screw bit, and the first stopper is sleeved on the outer side of the first clutch portion.

8. The locking and unlocking mechanism according to any one of claims 5 to 7, wherein: The second stopper includes a second abutment portion and a second protrusion portion which are connected to each other. Along the axial direction of the main shaft, the second abutment portion abuts against an end of the screw bit facing the main shaft, and the second protrusion is protruding from a side of the second abutment portion away from the screw bit. An end of the elastic member away from the main shaft abuts against the second abutment portion, and a portion of the elastic member is sleeved on the outside of the second protrusion.

9. The locking and unlocking mechanism according to any one of claims 5 to 8, wherein: Along the axial direction of the main shaft, the second clutch portion is protrudingly arranged at one end of the screw bit facing the main shaft, and the second stopper is sleeved on the outer side of the second clutch portion.

10. The locking and unlocking mechanism according to any one of claims 1 to 9, wherein: A limiting protrusion is convexly provided on the inner circumferential surface of the nut sleeve. Along the axial direction of the main shaft, the screw bit has an abutment surface facing the limiting protrusion. The abutment surface is closer to the main shaft than the limiting protrusion, and at least part of the projection of the limiting protrusion is located within the abutment surface.

11. The locking and unlocking mechanism according to claim 10, wherein: The screw head comprises: A moving part is movably arranged in the nut sleeve along the axial direction of the main shaft, the second clutch part is convexly arranged at one end of the moving part facing the main shaft, and along the axial direction of the main shaft, the side of the moving part away from the main shaft forms the abutment surface; The bit body is connected to the abutting surface, and the bit body is used to cooperate with the screw rod.

12. The locking and unlocking mechanism according to claim 11, wherein: The limiting protrusion is an annular structure arranged around the bit body.

13. The locking and unlocking mechanism according to any one of claims 1 to 12, wherein: The main axis comprises: Main body; A plug-in portion, along the axial direction of the main shaft, the plug-in portion is convexly arranged at one end of the main body facing the screw bit, and the first clutch portion is convexly arranged at one end of the plug-in portion away from the main body; Wherein, along the axial direction of the main shaft, the plug-in portion is plugged into the nut sleeve, and one end of the nut sleeve close to the main body portion abuts against the main body portion.

14. The locking and unlocking mechanism according to claim 13, wherein: The plug-in portion is interference fit with the nut sleeve.

15. The locking and unlocking mechanism according to claim 13 or 14, wherein: The plug-in portion is provided with a first circumferential limiting portion, and the nut sleeve is provided with a second circumferential limiting portion, and the second circumferential limiting portion cooperates with the first circumferential limiting portion to limit the rotation of the nut sleeve relative to the main shaft.

16. The locking and unlocking mechanism according to claim 15, wherein: The first circumferential limiting portion is a locking protrusion arranged on the outer circumferential surface of the plug-in portion, and the second circumferential limiting portion is a locking groove arranged at one end of the nut sleeve abutting against the main body portion, and the locking protrusion is locked in the locking groove.

17. An electric screwdriver, comprising: The locking and unlocking mechanism according to any one of claims 1 to 16; as well as A driving member is connected to the main shaft, and the driving member is configured to drive the main shaft to rotate.

18. A lock changing device, comprising: Lock changing platform; as well as The electric screwdriver as claimed in claim 17, wherein the driving member is mounted on the lock changing platform.

19. The lock changing device according to claim 18, wherein: The lock changing device further comprises a walking mechanism, the lock changing platform is mounted on the walking mechanism, and the walking mechanism is configured to drive the lock changing platform to move.

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