Locking device

Abstract

The application provides a locking device, comprising a shell, a magnetic shaft, an output wheel, a roller shaft, a roller, a driving member and a coil, the magnetic shaft is connected to the shell and can slide along the axial direction, the output wheel is connected to the shell and is used for connecting a tool, the output wheel is provided with an annular surface, the annular surface surrounds the magnetic shaft and has an inclined arc segment, the roller shaft is connected to the magnetic shaft perpendicularly, the roller is connected to the roller shaft, the roller can roll along the annular surface and exerts a tangential force on the output wheel at the inclined arc segment, the driving member is connected to the shell and the magnetic shaft and is used for driving the magnetic shaft to rotate, and the coil is connected to the shell and is used for exerting an axial force on the magnetic shaft. When the magnetic shaft rotates, the coil changes the axial force by changing the current, the tangential force changes with the axial force, the torque of the output wheel on the tool is a preset torque, and the control precision of the torque is improved; when the torque borne by the output wheel exceeds the preset torque, the output wheel stops rotating, the magnetic shaft drives the roller to roll along the annular surface through the roller shaft, and the magnetic shaft slides along the axial direction, and the over-torque protection is realized.

Description

Technical Field

[0001] This application relates to the field of electronic product assembly, specifically a locking device. Background Technology

[0002] Currently, the assembly of electronic products involves the fastening and assembly of many parts, which are typically metal or injection-molded components. These parts are usually fastened together with screws, and to ensure assembly accuracy, the torque of the screws needs to be set. Otherwise, excessive torque will lead to reduced assembly accuracy or even damage to the parts. Existing fastening devices usually use sensors to control torque, but this method has the problem of poor torque accuracy control, which makes it easy to apply excessive torque when fastening screws, resulting in larger overall assembly errors in electronic products and ultimately affecting product yield. Utility Model Content

[0003] In view of this, it is necessary to provide a locking device that can improve torque precision control.

[0004] One embodiment of this application provides a locking device, including a housing, a magnetic shaft, an output wheel, a roller shaft, a roller, a driving component, and a coil. A magnetic shaft is housed within a housing; an output wheel rotates axially along the magnetic shaft and is connected to the housing; the end of the output wheel facing the magnetic shaft has a ring surface that surrounds the magnetic shaft and has an inclined arc segment; the end of the output wheel away from the magnetic shaft is used to connect a tool; a roller shaft is located at the end of the magnetic shaft facing the output wheel; a roller is located at the end of the roller shaft facing the output wheel and is used to apply a force to the output wheel on the inclined arc segment when rolling along the ring surface; the force is used to provide torque to the tool from the output wheel; a drive unit has its drive end slidably connected to the magnetic shaft axially and is used to drive the magnetic shaft to rotate and realize the axial movement of the magnetic shaft; a coil is sleeved on the outside of the magnetic shaft and is used to adjust the magnitude of the force according to the magnitude of the current in the coil.

[0005] In use, the aforementioned fastening device drives the magnetic shaft to rotate. The magnetic shaft, through the roller shaft, drives the roller to roll along the annular surface of the output wheel. Simultaneously, when the coil is energized, it generates an axial force on the magnetic shaft. When the roller rolls to the inclined arc segment, the roller generates a tangential force on the output wheel. This tangential force generates a torque on the output wheel, causing the output wheel to rotate and fasten the screw. Since the magnitude of the torque varies with the magnitude of the tangential force, which in turn varies with the magnitude of the axial force, and the magnitude of the axial force varies with the magnitude of the current flowing through the coil, the torque can be controlled by controlling the magnitude of the coil current. Compared to traditional methods such as sensors, controlling the coil current can achieve higher precision, thereby improving the torque control accuracy. In addition, when the torque on the output wheel exceeds the preset torque, the resistance on the output wheel cancels out the tangential force of the roller, causing the roller to cross the inclined arc segment and thus stop driving the output wheel to rotate. The output wheel stops rotating, thereby stopping the screw fastening, realizing the over-torque protection function and reducing the risk of excessive torque. In summary, the above-mentioned fastening device can improve the torque precision control, thereby improving the overall assembly accuracy and yield of the product.

[0006] In some embodiments, the toroidal surface has four inclined arc segments, which are connected end to end to form the toroidal surface. The four inclined arc segments are defined as the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment, respectively. Two rollers are provided at one end facing the output wheel. When the magnetic shaft rotates clockwise, the two rollers apply force to the output wheel on the first arc segment and the third arc segment, respectively. When the magnetic shaft rotates counterclockwise, the two rollers apply force to the output wheel on the second arc segment and the fourth arc segment, respectively.

[0007] In some embodiments, the magnetic shaft includes a shaft body and a plurality of magnetic elements. The shaft body includes a first connecting segment, an intermediate segment, and a second connecting segment. The first connecting segment is connected to a drive element, the second connecting segment is connected to a roller shaft, and the intermediate segment connects the first connecting segment and the second connecting segment. The cross-sectional area of ​​the intermediate segment is smaller than the cross-sectional area of ​​the first connecting segment and the second connecting segment. The intermediate segment passes through the plurality of magnetic elements, and the plurality of magnetic elements are confined between the first connecting segment and the second connecting segment.

[0008] In some embodiments, the locking device further includes a sleeve disposed within the housing, a magnetic shaft inserted into the sleeve, the sleeve being used to allow the magnetic shaft to slide along the axial direction of the sleeve, and a coil wound around the sleeve and located between the housing and the sleeve.

[0009] In some embodiments, the driving component includes a driving body and a driving shaft. The driving body is connected to the housing, and the driving shaft is connected to the driving body. The driving body is used to drive the driving shaft to rotate. The driving shaft has two parallel first parallel surfaces. One end of the magnetic shaft has a groove with two parallel second parallel surfaces in the groove. The groove accommodates the driving shaft, and each first parallel surface contacts a second parallel surface, so that the driving shaft drives the magnetic shaft to rotate.

[0010] In some embodiments, one end of the magnetic shaft is provided with a shaft hole that extends radially through the magnetic shaft. The roller shaft passes through the shaft hole to be connected to the magnetic shaft. The magnetic shaft is also provided with a first pin hole, and the roller shaft is provided with a second pin hole. The first pin hole is aligned with the second pin hole. The locking device also includes a positioning pin for inserting into the first pin hole and the second pin hole. The positioning pin is perpendicular to the roller shaft and connected to the magnetic shaft to position the roller shaft on the magnetic shaft.

[0011] In some embodiments, the output wheel is provided with a clearance groove on the side facing the magnetic shaft. The clearance groove is used to accommodate the end of the magnetic shaft near the output wheel, so that the roller contacts the annular surface.

[0012] In some embodiments, the locking device further includes a bearing and a retaining ring. The output wheel is provided with a first annular groove and a flange. The first annular groove is used to install the retaining ring. The bearing is sleeved on the output wheel. The inner ring of the bearing is confined between the flange and the retaining ring. The outer ring of the bearing is connected to the housing.

[0013] In some embodiments, the locking device further includes a lower end cover connected to one end of the housing. The housing has a second annular groove that passes through the end of the housing connected to the lower end cover. The second annular groove is used to accommodate the outer ring of the bearing. The lower end cover has a limiting ring that is used to limit the outer ring of the bearing to the second annular groove.

[0014] In some embodiments, the lower end cover has an exposure hole, the output wheel has a boss that extends out of the housing through the exposure hole, and the boss has a mounting hole for mounting tools. Attached Figure Description

[0015] Figure 1 This is a perspective view of the locking device in one embodiment of this application.

[0016] Figure 2 for Figure 1 A three-dimensional view of the locking device from another perspective.

[0017] Figure 3 for Figure 2 Cross-sectional view of the central locking device along line III-III.

[0018] Figure 4 This is a perspective view of the output wheel in one embodiment of this application.

[0019] Figure 5 for Figure 4 Force analysis diagram of the output wheel in the middle.

[0020] Figure 6 This is an exploded view of the drive component, magnetic shaft, roller shaft, and roller in one embodiment of this application.

[0021] Figure 7 for Figure 1 Exploded view of the locking device in the diagram.

[0022] Figure 8 for Figure 7 An exploded view of the locking device from another perspective.

[0023] Figure 9 for Figure 3 A magnified view of point IX in the image. Detailed Implementation

[0024] The technical solution of this application will now be described with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments.

[0025] It should be noted that when an element is considered to be "connected to" or "located on" another element, it can be directly connected to the other element or may have an element centrally located. In this application, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "fixed," etc., should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. The terms "first," "second," etc., are only used to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary / secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified. The shape descriptions in the embodiments of this application are merely illustrative and should not constitute any absolute limitation on this application. The terms "vertical" and "parallel" are used to describe the ideal state between two components; in actual production or use, a state approximately vertical or parallel may exist.

[0026] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. Where there is no conflict, the various embodiments in this application can be combined with each other.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms “comprising,” “having,” and “equipped with,” and any variations thereof, in the description, claims, and foregoing drawings of this application, are intended to cover non-exclusive inclusion.

[0028] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] like Figures 1 to 5 As shown, one embodiment of this application provides a locking device 100 for installing tools to lock screws, the tools being screwdriver heads, etc. The locking device 100 includes a housing 10, a magnetic shaft 20, an output wheel 30, a roller shaft 40, a roller 50, a driving member 60, and a coil 70. The magnetic shaft 20 is connected to the housing 10 and can slide back and forth along its axial direction (X direction). The output wheel 30 is connected to the housing 10 and is used to connect tools. The output wheel 30 has an annular surface 31, which surrounds the magnetic shaft 20 and has an inclined arc segment 311. The roller shaft 40 is connected to the magnetic shaft 20, and the axial direction of the roller shaft 40 is Y direction. The roller 50 is connected to the roller shaft 40 and can roll along the annular surface 31 and apply a tangential force Ft to the output wheel 30 in the inclined arc segment 311. The driving member 60 is connected to the housing 10 and the magnetic shaft 20 and is used to drive the magnetic shaft 20 to rotate. The coil 70 is connected to the housing 10 and applies an axial force Fa to the magnetic shaft 20 after being energized. The magnetic shaft 20 transmits the axial force Fa to the output wheel 30 through the roller shaft 40 and the roller 50.

[0030] Among them, the axial force Fa and the tangential force Ft are two components of the interaction force F (i.e. the force mentioned above) between the roller 50 and the inclined arc segment 311. The tangential force Ft is the component along the Y direction, and the axial force Fa is the component along the X direction. The axial force Fa will not generate torque on the output wheel 30, only the tangential force Ft can generate torque on the output wheel 30.

[0031] Let the inclination of the inclined arc segment 311 relative to the Y direction be θ, the height difference along the X direction be H, the arc length be L, and the average radius of the contact position between the output wheel 30 and the roller 50 be R. Then, the torque T generated by the roller 50 on the output wheel 30 can be obtained as follows: T = Ft * R; Since Ft=Fa*tanθ; Tanθ=H / L; Therefore, T = Ft * R = Fa * tanθ * R Let the magnetic field strength of magnetic shaft 20 be B, the length of coil 70 be W, and the current in coil 70 be I. Then we can get: Fa = B * W * I. Therefore, T=Ft*R=Fa*tanθ*R=B*W*I*tanθ*R, since the values ​​of B, W, tanθ, and R are all structural constants (structural constants refer to the values ​​that the locking device 100 cannot change after production based on the product design). Therefore, from the above formula T=B*W*I*tanθ*R, we know that: The torque T generated by the roller 50 on the output wheel 30 is proportional to the current I of the coil 70. That is, the coil 70 can change the magnitude of the torque T of the output wheel 30 by changing the magnitude of the current I, so that the torque of the output wheel 30 is the preset torque, and the tool can achieve precise screw fastening under the preset torque.

[0032] Furthermore, when the torque on the output wheel 30 exceeds the preset torque, the output wheel 30 stops rotating, and the magnetic shaft 20 drives the roller 50 to roll along the annular surface through the roller shaft 40.

[0033] The resistance experienced by the output wheel 30 can counteract the tangential force Ft of the roller 50, causing the roller 50 to pass over the inclined arc segment 311, thus preventing it from continuing to drive the output wheel 30 to rotate and stopping the output wheel 30 from rotating, thereby stopping the locking screw. At the same time, the magnetic shaft 20 slides along the X direction, which can prevent the magnetic shaft 20 from being jammed, thus realizing the over-torque protection function of the locking device 100.

[0034] In some embodiments, such as Figures 3 to 5 As shown, the toroidal surface 31 has four inclined arc segments 311, each with an arc of 90 degrees in the Y-direction plane, and they are connected end to end to form the toroidal surface 31. The four inclined arc segments 311 are defined as the first arc segment 311a, the second arc segment 311b, the third arc segment 311c, and the fourth arc segment 311d, respectively. Two rollers 50 are respectively located at both ends of the roller shaft 40. When the magnetic shaft 20 rotates clockwise in the direction S, the two rollers 50 apply tangential forces Ft to the output wheel 30 in the first arc segment 311a and the third arc segment 311c respectively, causing the output wheel 30 to rotate clockwise in the direction S. When the magnetic shaft 20 rotates counterclockwise in the direction N, the two rollers 50 apply tangential forces Ft to the output wheel 30 in the second arc segment 311b and the fourth arc segment 311d respectively, causing the output wheel 30 to rotate counterclockwise in the direction N. That is, regardless of whether the driving component 60 drives the magnetic shaft 20 to rotate clockwise in the direction S or counterclockwise in the direction N, the rollers 50 can drive the output wheel 30 to rotate, so as to realize the function of fastening and loosening screws. In addition, the two rollers 50 drive the output wheel 30 together at a position 180 degrees apart, which can make the force on the output wheel 30 more even, thereby improving the stability of the output wheel 30.

[0035] Since there are two rollers 50, each roller 50 generates a tangential force Ft on the output roller 30, so the above formula becomes: T = 2 * Ft * R; Since the four inclined arc segments 311 have an arc of 90 degrees and are connected end to end to form a torus 31, L = 1 / 4 * 2πR. The average diameter of the contact position between the output wheel 30 and the roller 50 is defined as D, D = 2R, that is, L = 1 / 4πD. Therefore, Tanθ=H / L=H / (1 / 4πD)=4H / πD; T=2*Ft*R=Ft*D=Fa*tanθ*D=Fa*4H / π; Define the structure constant K = 4H / π; Therefore, T = Fa * K.

[0036] In some embodiments, since the magnetic shaft 20, roller shaft 40 and roller 50 have their own weight, the gravity of the magnetic shaft 20, roller shaft 40 and roller 50 is defined as G. When the locking device 100 is used vertically, the gravity G and the axial force Fa will be superimposed, so that the tangential force Ft becomes: Ft=(G+Fa)*tanθ; Therefore, T = G*K + Fa*K; Define the initial torque T0 = G * K; Available: T=T0+Fa*K=T0+(B*W*I)*K; Define the structural constant Mk = BWK; We can obtain: T = T0 + Mk * I.

[0037] Understandably, when the locking device is used horizontally at 100 degrees, gravity G has no effect on torque T, so T0 = 0, and at this time T = Mk * I. It should be noted that gravity G is very small compared to the axial force Fa, and in actual use, gravity G can be ignored, that is, T0 is approximately equal to 0.

[0038] In some embodiments, such as Figure 6 , Figure 7 and Figure 8As shown, the magnetic shaft 20 includes a shaft body 21 and multiple magnetic components 22. The shaft body 21 includes a first connecting section 211, an intermediate section 212, and a second connecting section 213. The first connecting section 211 is connected to the drive component 60, the second connecting section 213 is connected to the roller shaft 40, and the intermediate section 212 connects the first connecting section 211 and the second connecting section 213. The cross-sectional area of ​​the intermediate section 212 is smaller than that of the first connecting section 211 and the second connecting section 213. The intermediate section 212 passes through multiple magnetic components 22, which are confined between the first connecting section 211 and the second connecting section 213. The magnetic components 22 can be magnets with constant magnetic poles, etc. When the coil 70 is energized, the magnetic field generated by the coil 70 interacts with the magnetic components 22 to generate an axial force Fa on the magnetic components 22, thereby causing the magnetic components 22 to generate an axial force Fa on the shaft body 21. The shaft body 21 transmits the axial force Fa to the output wheel 30 through the roller shaft 40 and the roller 50.

[0039] In some embodiments, such as Figure 3 , Figure 6 , Figure 7 and Figure 8 As shown, the locking device 100 also includes a sleeve 80, which is fixed inside the housing 10. The magnetic shaft 20 is inserted into the sleeve 80, with the axial direction of the sleeve 80 being the X direction. The magnetic shaft 20 can rotate within the sleeve 80 and slide along the X direction. The sleeve 80 serves to guide the movement of the magnetic shaft 20, allowing it to slide along the X direction and improving the stability of the magnetic shaft 20's sliding. Furthermore, a coil 70 is wound around the sleeve 80 and located between the housing 10 and the sleeve 80. The locking device 100, through the sleeve 80, can both guide the magnetic shaft 20 and fix the coil 70.

[0040] In some embodiments, such as Figure 3 , Figure 7 and Figure 8 As shown, the housing 10 includes an upper housing 11 and a lower housing 12. The upper housing 11 is fitted onto one end of the lower housing 12. The coil 70 is disposed between the upper housing 11 and the sleeve 80. The lower housing 12 has a first stop ring 121 inside, which extends radially from the outside to the inside. The sleeve 80 passes through the first stop ring 121, and the first stop ring 121 is used to limit the sleeve 80 radially. A second stop ring 81 is provided at the end of the sleeve 80 near the first stop ring 121, which extends radially from the inside to the outside. The second stop ring 81 is located on the side of the first stop ring 121 facing the output wheel 30. The first stop ring 121 is used to prevent the second stop ring 81 from moving away from the output wheel 30, thereby limiting the sleeve 80 in this direction. Optionally, the upper housing 11 is connected to the lower housing 12 by a thread.

[0041] In some embodiments, such as Figure 3 , Figure 7 and Figure 8 As shown, the locking device 100 also includes an upper end cover 90, which is located at the end of the upper housing 11 away from the lower housing 12. The upper end cover 90 is used to install the driving member 60, thereby fixing the driving member 60 to the housing 10. The upper end cover 90 is provided with an inner support ring 91, which is inserted into the end of the sleeve 80 near the upper end cover 90 and supports the sleeve 80 radially. The inner support ring 91 not only limits the radial movement of the end of the sleeve 80 near the upper end cover 90, but also restricts the movement of the sleeve 80 toward the output wheel 30 by friction. Exemplarily, the inner support ring 91 and the sleeve 80 are interference-fitted, thereby fixing the sleeve 80 to the upper end cover 90.

[0042] In some embodiments, such as Figure 6 , Figure 7 and Figure 8 As shown, the drive unit 60 includes a drive body 61 and a drive shaft 62. The drive body 61 is connected to the housing 10, and the drive shaft 62 is connected to the drive body 61. The drive body 61 is used to drive the drive shaft 62 to rotate. The drive shaft 62 is provided with two parallel first parallel surfaces 621. One end of the magnetic shaft 20 is provided with a groove 23. The groove 23 is provided with two parallel second parallel surfaces 231. The groove 23 is used to accommodate the drive shaft 62. Each first parallel surface 621 contacts a second parallel surface 231, so that the drive shaft 62 drives the magnetic shaft 20 to rotate. In addition, the first parallel surface 621 and the second parallel surface 231 are both parallel to the X direction, so that the first parallel surface 621 can slide relative to the second parallel surface 231 in the X direction. Thus, the magnetic shaft 20 can slide relative to the drive shaft 62 in the X direction while being driven by the drive shaft 62, so as to realize the over-torque protection function of the locking device 100.

[0043] In some embodiments, such as Figure 6 , Figure 7 and Figure 8 As shown, one end of the magnetic shaft 20 is provided with a shaft hole 24, which penetrates the magnetic shaft 20 radially. The roller shaft 40 passes through the shaft hole 24 to connect to the magnetic shaft 20. The magnetic shaft 20 is also provided with a first pin hole 25, and the roller shaft 40 is provided with a second pin hole 41. The first pin hole 25 is aligned with the second pin hole 41. The locking device 100 also includes a positioning pin 101, which is used to insert into the first pin hole 25 and the second pin hole 41 in the X direction and connect to the magnetic shaft 20 to position the roller shaft 40 on the magnetic shaft 20. Exemplarily, the first pin hole 25 has an internal thread, and the positioning pin 101 has an external thread. The positioning pin 101 is locked in the first pin hole 25 by the thread.

[0044] In some embodiments, such as Figure 3 , Figure 4 and Figure 9As shown, the output wheel 30 has a relief groove 32 on the side facing the magnetic shaft 20. The relief groove 32 is used to accommodate the end of the magnetic shaft 20 near the output wheel 30, so as to avoid interference between the end of the magnetic shaft 20 and the output wheel 30, so as to achieve contact between the roller 50 and the annular surface 31.

[0045] In some embodiments, such as Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, the locking device 100 also includes a bearing 102 and a retaining ring 103. The output wheel 30 is provided with a first annular groove 33 and a flange 34. The first annular groove 33 is used to install the retaining ring 103. The bearing 102 is sleeved on the output wheel 30. The inner ring of the bearing 102 is limited between the flange 34 and the retaining ring 103. The outer ring of the bearing 102 is connected to the housing 10. The bearing 102 is used to realize the rotation of the output wheel 30 relative to the housing 10.

[0046] In some embodiments, such as Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, the locking device 100 also includes a lower end cover 104, which is connected to the end of the lower shell 12 away from the upper shell 11. The lower shell 12 is provided with a second annular groove 122, which extends through the end of the lower shell 12 away from the upper shell 11. The second annular groove 122 is used to accommodate the outer ring of the bearing 102. The lower end cover 104 is provided with a limiting ring 1041, which is used to limit the outer ring of the bearing 102 in the second annular groove 122 to fix the bearing 102 and the shell 10.

[0047] In some embodiments, such as Figure 3 , Figure 7 , Figure 8 and Figure 9 As shown, the lower end cover 104 has an exposure hole 1042, the output wheel 30 has a boss 35, the boss 35 extends out of the housing 10 through the exposure hole 1042, the boss 35 has a mounting hole 351, the mounting hole 351 is used to install tools so that the output wheel 30 drives the tool to rotate to lock the screw.

[0048] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A locking device, characterized in that, include: case; A magnetic shaft is disposed within the housing; The output wheel is rotatably connected to the housing along the axial direction of the magnetic shaft; The output wheel facing the magnetic shaft has a ring surface that surrounds the magnetic shaft and has an inclined arc segment; the output wheel facing away from the magnetic shaft is used to connect a tool. A roller shaft is disposed at one end of the magnetic shaft facing the output wheel; A roller, disposed at one end of the roller shaft facing the output wheel, is used to apply a force to the output wheel on the inclined arc segment when rolling along the annular surface; the force is used to provide torque of the output wheel on the tool; A driving component, wherein the driving end of the driving component is slidably connected to the magnetic shaft along the axial direction, for driving the magnetic shaft to rotate and realizing the movement of the magnetic shaft in the axial direction; and A coil, sleeved on the outside of the magnetic shaft, is used to adjust the magnitude of the force according to the magnitude of the current in the coil.

2. The locking device as described in claim 1, characterized in that: The annular surface has four inclined arc segments, which are connected end to end to form the annular surface. The four inclined arc segments are defined as the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment, respectively. Two rollers are provided at the end facing the output wheel. When the magnetic shaft rotates clockwise, the two rollers apply the force to the output wheel on the first arc segment and the third arc segment, respectively. When the magnetic shaft rotates counterclockwise, the two rollers apply the force to the output wheel on the second arc segment and the fourth arc segment, respectively.

3. The locking device as described in claim 1, characterized in that: The magnetic shaft includes a shaft body and a plurality of magnetic components. The shaft body includes a first connecting section, a middle section, and a second connecting section. The first connecting section is connected to the driving component, and the second connecting section is connected to the roller shaft. The middle section connects the first connecting section and the second connecting section. The cross-sectional area of ​​the middle section is smaller than the cross-sectional area of ​​the first connecting section and the second connecting section. The middle section passes through the plurality of magnetic components, and the plurality of magnetic components are confined between the first connecting section and the second connecting section.

4. The locking device as described in claim 1, characterized in that: The locking device further includes a sleeve disposed inside the housing, the magnetic shaft being inserted into the sleeve, the sleeve being used to allow the magnetic shaft to slide along the axial direction of the sleeve, and the coil being wound around the sleeve and located between the housing and the sleeve.

5. The locking device as described in claim 1, characterized in that: The driving component includes a driving body and a driving shaft. The driving body is connected to the housing, and the driving shaft is connected to the driving body. The driving body is used to drive the driving shaft to rotate. The driving shaft has two parallel first parallel surfaces. One end of the magnetic shaft has a groove with two parallel second parallel surfaces. The groove accommodates the driving shaft. Each first parallel surface contacts one second parallel surface, causing the driving shaft to drive the magnetic shaft to rotate.

6. The locking device as described in claim 1, characterized in that: One end of the magnetic shaft is provided with a shaft hole, which extends radially through the magnetic shaft. The roller shaft passes through the shaft hole to be connected to the magnetic shaft. The magnetic shaft is also provided with a first pin hole, and the roller shaft is provided with a second pin hole. The first pin hole is aligned with the second pin hole. The locking device also includes a positioning pin, which is used to insert into the first pin hole and the second pin hole. The positioning pin is perpendicular to the roller shaft and connected to the magnetic shaft to position the roller shaft on the magnetic shaft.

7. The locking device as described in claim 1, characterized in that: The output wheel has a clearance groove on the side facing the magnetic shaft. The clearance groove is used to accommodate the end of the magnetic shaft near the output wheel, so that the roller contacts the annular surface.

8. The locking device as described in claim 1, characterized in that: The locking device further includes a bearing and a retaining ring. The output wheel is provided with a first annular groove and a flange. The first annular groove is used to install the retaining ring. The bearing is sleeved on the output wheel. The inner ring of the bearing is confined between the flange and the retaining ring. The outer ring of the bearing is connected to the housing.

9. The locking device as described in claim 8, characterized in that: The locking device further includes a lower end cover, which is connected to one end of the housing. The housing is provided with a second annular groove, which passes through the end of the housing connected to the lower end cover. The second annular groove is used to accommodate the outer ring of the bearing. The lower end cover is provided with a limiting ring, which is used to limit the outer ring of the bearing to the second annular groove.

10. The locking device as described in claim 9, characterized in that: The lower end cover has an exposure hole, the output wheel has a boss, the boss extends out of the housing through the exposure hole, and the boss has a mounting hole for mounting the tool.

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