阅读说明：本技术 自锁机构、马达及线性致动器 (Self-locking mechanism, motor and linear actuator ) 是由 岑余杰 唐诗轶 于 2021-07-07 设计创作，主要内容包括：本发明公开了自锁机构、马达及线性致动器,属于自锁机构领域,具有稳定的自锁性能,本发明的自锁机构,包括摩擦环和相对所述摩擦环保持固定的安装座,所述摩擦环上设有缺口,所述摩擦环套装在需要制动的回转体上,所述安装座上限定出用于安装所述摩擦环的安装部,所述安装部向缺口方向挤压摩擦环以向回转体施加制动力。(The invention discloses a self-locking mechanism, a motor and a linear actuator, which belong to the field of self-locking mechanisms and have stable self-locking performance.)

1. The self-locking mechanism is characterized by comprising a friction ring and a mounting seat which is fixed relative to the friction ring, wherein a gap is formed in the friction ring, the friction ring is sleeved on a revolving body needing braking, a mounting part used for mounting the friction ring is defined on the mounting seat, and the mounting part extrudes the friction ring to the gap direction so as to apply braking force to the revolving body.

2. The self-locking mechanism of claim 1, further comprising a limiting structure for limiting circumferential rotation of the friction ring relative to the mount.

3. The self-locking mechanism of claim 2, wherein the limiting structure comprises a slot provided on the mounting portion and a flange provided on the friction ring, the flange being snapped into the slot.

4. The self-locking mechanism of claim 3, wherein both ends of the friction ring are provided with flanges which are clamped into the clamping grooves.

5. The self-locking mechanism of claim 3, wherein one of the two ends of the friction ring is provided with the flange.

6. The self-locking mechanism of claim 3, wherein the friction ring has a plurality of flanges spaced around its periphery, and the mounting portion has a plurality of slots corresponding to the plurality of flanges.

7. The self-locking mechanism according to any one of claims 1 to 6, wherein the mounting portion defines a mounting groove for receiving the friction ring, and the mounting portion is further provided with a clip for limiting the friction ring in the mounting groove.

8. The self-locking mechanism according to any one of claims 1 to 6, wherein the mounting seat comprises an annular base and a plurality of brackets arranged on the periphery of the base at intervals, and the plurality of brackets are connected through a chassis to form the mounting part.

9. Motor, characterized in that it comprises a drive shaft and a self-locking mechanism according to any one of claims 1 to 8 for braking said drive shaft.

10. Linear actuator, characterized in that it comprises a motor according to claim 9.

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of self-locking mechanisms, in particular to a self-locking mechanism, a motor and a linear actuator.

[ background of the invention ]

The common electric lifting upright post adopts the principle of self-locking of a machine core, self-locking of a screw rod transmission and self-locking of a torsional spring. The lead angle of the self-locking of the movement through the transmission of the worm and the worm wheel is smaller than the equivalent friction angle. The common worm material 40Cr and the worm wheel material POM100P form a certain friction coefficient, which is about 0.1-0.15. However, in the electric lifting table, the worm wheel bearing surface is enlarged due to the increase of the load. The stress load of the worm wheel is increased, so that after the worm wheel of the machine core is loaded for a period of time, the friction force of the worm wheel is reduced, and the self-locking performance is reduced. The torsion spring self-locking is also based on a similar principle, the torsion spring seat is made of POM100P, and when the torsion spring seat is stressed by a metal torsion spring, the friction coefficient of the torsion spring seat can be reduced after the torsion spring seat runs for a period of time, so that the self-locking performance is reduced.

[ summary of the invention ]

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a self-locking mechanism which has stable self-locking performance.

In order to solve the technical problems, the invention adopts the following technical scheme:

the self-locking mechanism comprises a friction ring and a mounting seat which is fixed relative to the friction ring, wherein a notch is formed in the friction ring, the friction ring is sleeved on a revolving body needing braking, a mounting part used for mounting the friction ring is defined on the mounting seat, and the mounting part extrudes the friction ring to apply braking force to the revolving body in the direction of the notch.

On the basis of the scheme, the self-locking mechanism further comprises a limiting structure used for limiting the circumferential rotation of the friction ring relative to the mounting seat.

On the basis of the scheme, the limiting structure comprises a clamping groove and a convex edge, the clamping groove is formed in the installation part, the convex edge is arranged on the friction ring, and the convex edge is clamped into the clamping groove.

On the basis of the scheme, the two ends of the friction ring are respectively provided with a convex edge clamped into the clamping groove.

On the basis of the scheme, the convex edge is arranged at one of two ends of the friction ring.

On the basis of the scheme, the periphery interval of friction ring sets up a plurality of chimbs, the installation department corresponds a plurality of chimbs and sets up a plurality of draw-in grooves.

On the basis of above-mentioned scheme, the installation department is injectd and is used for holding the mounting groove of friction ring, still be equipped with on the installation department with the spacing buckle in the mounting groove of friction ring.

On the basis of the scheme, the mounting seat comprises an annular base and a plurality of supports arranged on the circumference of the base at intervals, and the supports are connected through a chassis to form the mounting part.

The motor comprises a driving shaft and the self-locking mechanism, and the self-locking mechanism is used for braking the driving shaft.

A linear actuator comprising the motor described above.

The invention has the beneficial effects that:

the invention discloses a self-locking mechanism, wherein a mounting seat and a friction ring are fixedly held, the friction ring is sleeved on a revolving body, a certain distance is left between two ends of the friction ring, i.e. defining notches defined by the two ends of the friction ring, which notches enable the inner diameter of the friction ring to change under an external force, the friction ring shrinks towards the gap under the extrusion of the mounting seat to reduce the inner diameter of the friction ring, and the friction ring is tightly contacted with the revolving body, so that the friction ring can exert acting force on the revolving body (the acting force is sliding friction force generated between the revolving body and the friction ring when the revolving body rotates), so as to hinder the rotation of the revolving body, so that the revolving body can stop rotating rapidly, when the revolving body keeps still, a static self-locking force exists between the friction ring and the revolving body, thus, dynamic and static self-locking can be formed, and the self-locking mechanism has stable self-locking performance;

the mounting seat and the friction ring are of two independent structures, the self-locking performance of the self-locking mechanism can be influenced after the friction ring is worn, the normal self-locking performance of the self-locking mechanism can be recovered by replacing the friction ring, and the use is convenient;

when installing, because the breach has been set up on the friction ring, consequently, the internal diameter of friction ring also can enlarge easily, in order to conveniently install it on the solid of revolution, the assembly of mount pad and friction ring is carried out again afterwards, current self-locking mechanism, its friction part is interference fit usually with the solid of revolution, in the two assembling process, can appear wearing and tearing and the burr appears on the solid of revolution, self-locking mechanism is carrying out the in-process of braking, can produce great noise because of the existence of burr, and the self-locking mechanism that this application discloses, can protect the solid of revolution well in the assembling process, thereby the too big problem of noise can not appear yet.

Furthermore, the self-locking mechanism further comprises a limiting structure for limiting the circumferential rotation of the friction ring relative to the mounting seat. Under the action of the limiting structure, the friction ring can keep static relative to the mounting seat and cannot synchronously rotate along with the revolving body, sliding friction force exists between the friction ring and the mounting seat when the revolving body normally rotates, and the revolving body can be quickly stopped by the sliding friction force when the revolving body needs to be stopped.

Furthermore, limit structure is including setting up draw-in groove on the installation department is in with the setting the chimb on the friction ring, the chimb card is gone into in the draw-in groove. The convex edge is clamped in the clamping groove, so that the rotation of the friction ring can be limited, the matching mode of the convex edge and the clamping groove is simple, the matching can be completed only by aligning the convex edge with the clamping groove and applying pressure, the assembling difficulty of the self-locking mechanism cannot be increased, the clamping groove and the convex edge have a positioning function in a matching manner, and the inner diameter of the friction ring can be directly reduced after the matching of the convex edge and the clamping groove is completed, so that the close contact between the friction ring and the revolving body is ensured; if set up the draw-in groove on the friction ring, can lead to the thickness of friction ring inhomogeneous, because the friction ring needs to carry out certain deformation, consequently the cooperation mode between draw-in groove and the chimb can not be interference fit, can leave certain clearance between the two, and deformation can appear in the friction ring under the frictional force effect, especially has set up the position of draw-in groove, and the thin shape variable of thickness here can be bigger to the cracked condition appears easily.

Furthermore, both ends of the friction ring are provided with convex edges clamped into the clamping grooves. After chimb and draw-in groove cooperation, can restrict the deformation degree with chimb hookup location in the breach direction on the friction ring, because the both ends of friction ring have all set up the chimb, consequently, the change amount of the solid of revolution breach width when rotating has been injectd, avoided under the frictional force effect between the solid of revolution and friction ring, the width of breach is too big and make the big or small decline of braking force, and the both ends of friction ring have all set up the chimb, no matter the solid of revolution is corotation or reversal, the braking force size that receives all is the same, thereby can realize the two-way auto-lock to the solid of revolution.

Further, one of the two ends of the friction ring is provided with the convex edge. Chimb and draw-in groove cooperation back, can restrict on the friction ring with the chimb hookup location in the deformation degree of breach direction, consequently, be equipped with the one end of chimb in the both ends of friction ring, its deformation degree can receive the restriction, and the other end is easier to the direction deformation of keeping away from the breach, when the solid of revolution rotates to the direction that has this one end of chimb, the internal diameter variation of friction ring is little, the frictional force that produces between friction ring and the solid of revolution is big, when the solid of revolution rotates towards another direction, the internal diameter variation of friction ring is great, the frictional force of production is little, so can realize the one-way auto-lock to the solid of revolution.

Further, the periphery interval of friction ring sets up a plurality of chimbs, the installation department corresponds a plurality of chimbs and sets up a plurality of draw-in grooves. Each convex edge can limit the deformation amount of the friction ring, the deformation amount of the whole friction ring is limited through the convex edges arranged at intervals, and the width change of the gap when the revolving body rotates is reduced, so that the better self-locking performance can be kept, and the revolving body is subjected to bidirectional self-locking.

Further, the installation department is injectd and is used for holding the mounting groove of friction ring, still be equipped with on the installation department with the buckle of friction ring spacing in the mounting groove. Under the combined action of the buckle and the mounting groove, the displacement of the friction ring in the axial direction of the revolving body can be limited, so that the friction ring is prevented from being separated from the mounting seat to influence the braking performance; and come to carry on spacingly to the friction ring through the buckle, can make things convenient for the assembly process of friction ring and mount pad, need not operate the buckle simultaneously in the assembly process, only need with the friction ring to the mounting groove direction extrusion hard can accomplish the assembly.

Furthermore, the mounting seat comprises an annular base and a plurality of supports arranged on the circumference of the base at intervals, and the supports are connected through a chassis to form the mounting part. The two adjacent brackets have a certain distance, so that the brackets can deviate by a certain angle relative to the base and can be better matched with a revolving body, and the mounting seat with the structure allows the base to have a certain deformation amount, so that the mounting of the mounting seat on equipment can be facilitated.

The invention also discloses a motor, the motor outputs the power of the motor through the driving shaft, and the motor is internally provided with the self-locking mechanism disclosed in the specification, so that the braking force acting on the driving shaft can be generated, when the driving shaft normally rotates, the driving shaft can overcome the friction force between the driving shaft and the friction ring, and when the motor needs to stop, the braking force of the self-locking mechanism can enable the driving shaft to quickly stop rotating, so that the accuracy of the motor can be improved.

The invention also discloses a linear actuator, wherein the linear actuator is internally provided with the motor disclosed in the specification, the motor provides power in a linear direction for the linear actuator, the linear actuator is usually applied to a lifting device, if the lifting device is internally provided with the linear actuator, the lifting device can be kept stable under the self-locking effect of a self-locking mechanism when a load is applied to the lifting device, the lifting device is not easy to retreat under the action of external force, and the lifting height of the lifting device can be accurately controlled.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described below with reference to the accompanying drawings:

FIG. 1 is a schematic structural diagram A of a self-locking mechanism according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram B of the self-locking mechanism according to the embodiment of the present invention;

FIG. 3 is a schematic structural diagram C of the self-locking mechanism according to the embodiment of the present invention;

FIG. 4 is a schematic structural diagram D of the self-locking mechanism according to the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a mounting base according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a motor according to an embodiment of the present invention;

FIG. 7 is an exploded view of a motor in an embodiment of the present invention;

fig. 8 is a schematic structural diagram of an end cap according to an embodiment of the invention.

Reference numerals:

friction ring 100, notch 110, flange 120;

the mounting structure comprises a mounting seat 200, a base 201, a bracket 202, a chassis 203, a mounting part 210, a mounting groove 220, a buckle 230, an elastic sheet 231, a clamping hook 232 and a clamping groove 240;

drive shaft 300, shell 310, end cover 320, fixture block 330, screens groove 340.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, the embodiment of the invention discloses a self-locking mechanism, which comprises a friction ring 100 and a mounting seat 200 fixed relative to the friction ring 100, wherein a notch 110 is arranged on the friction ring 100, the friction ring 100 is sleeved on a revolving body needing braking, a mounting part 210 used for mounting the friction ring 100 is defined on the mounting seat 200, and the mounting part 210 presses the friction ring 100 towards the notch 110 to apply braking force to the revolving body.

The self-locking mechanism disclosed by the application has the advantages that the mounting seat 200 and the friction ring 100 are kept fixed, the friction ring 100 is sleeved on the revolving body, a certain distance is reserved between two ends of the friction ring, namely, the notches 110 defined by two ends of the friction ring 100 are defined, the notches 110 enable the inner diameter of the friction ring 100 to change under the action of external force, the friction ring 100 is contracted towards the notches 110 under the extrusion of the mounting seat 200 to reduce the inner diameter of the friction ring and is tightly contacted with the revolving body, so that the friction ring 100 can exert the action force (the action force refers to the sliding friction force generated between the friction ring 100 and the revolving body during rotation) on the revolving body to block the rotation of the revolving body, the revolving body can be rapidly stopped to rotate, when the revolving body is kept static, the static self-locking force exists between the friction ring 100 and the revolving body, and thus dynamic and static self-locking can be formed, the self-locking mechanism has stable self-locking performance; the gap 110 can also be used for storing oil, so that the service life of the friction ring 100 is prolonged, and the abrasion degree of the friction ring 100 is reduced;

the installation seat 200 and the friction ring 100 are two independent structures, the self-locking performance of the self-locking mechanism can be influenced after the friction ring 100 is abraded, the normal self-locking performance of the self-locking mechanism can be recovered by replacing the friction ring 100, the use is convenient, the material of the installation seat 200 is preferably PEEK or PPS, the material of the friction ring 100 is preferably PEEK, the installation seat 200 and the friction ring 100 have good high-temperature resistance, the friction coefficient of the self-locking mechanism cannot be reduced due to self-temperature rise in the working process, and the stable self-locking performance is kept;

when installing, owing to set up breach 110 on the friction ring 100, consequently, the internal diameter of friction ring 100 also can expand easily, in order to conveniently install it on the solid of revolution, the assembly of mount pad 200 and friction ring 100 is carried out again afterwards, current self-locking mechanism, its friction part is interference fit usually with the solid of revolution, in the two assembling process, can appear wearing and tearing and appear the burr on the solid of revolution, self-locking mechanism is carrying out the in-process of braking, can produce great noise because of the existence of burr, and the self-locking mechanism disclosed in this application, can protect the solid of revolution well in the assembling process, thereby the too big problem of noise can not appear yet.

Installation department 210 inject the mounting groove 220 that is used for holding friction ring 100, mounting groove 220 is a circular shape groove, and the diapire at mounting groove 220 central part link up the setting to make things convenient for the solid of revolution to run through mount pad 200, still be equipped with the buckle 230 that sets up along mounting groove 220 circumference on the installation department 210, buckle 230 can carry on spacingly to friction ring 100, with its restriction in mounting groove 220, make it unable in solid of revolution axial direction removal, in order to avoid friction ring 100 and mount pad 200 to separate and influence brake performance.

Buckle 230 is set up to be with mount pad 200 integrated into one piece, so when installing friction ring 100 on mount pad 200, need not take off buckle 230 and install friction ring 100 again, only need with friction ring 100 to the installation groove 220 orientation hard extrusion can accomplish the assembly, can make things convenient for the assembling process, when friction ring 100 wearing and tearing seriously need to be changed, demolish also comparatively conveniently equally.

Preferably, the buckle 230 includes a spring 231 capable of deforming in the radial direction of the mounting groove 220 and a hook 232 disposed at an end of the spring 231, when the friction ring 100 is mounted, the friction ring 100 is aligned with the mounting groove 220 and then pushed to the mounting groove 220, in this process, the friction ring 100 pushes the hook 232 to deform the spring 231 in a direction away from the mounting groove 220, when the friction ring 100 enters the mounting groove 220, the spring 231 and the hook 232 return to each other, and the hook 232 catches the friction ring 100 to limit the axial displacement of the friction ring in the mounting groove 220.

Referring to fig. 4, or, the buckle 230 is an L-shaped buckle block, and the buckle block is not easy to deform, has higher circumferential limiting strength for the friction ring 100, and has better self-locking performance.

Referring to fig. 1, based on the above embodiment, in another embodiment of the present invention, a specific structure of the limiting structure is specifically described.

The position limiting structure includes a locking groove 240 disposed on the mounting portion 210 and a raised edge 120 disposed on the friction ring 100, wherein the raised edge 120 is locked into the locking groove 240.

The chimb 120 card is gone into behind the draw-in groove 240, alright in order to make the rotation of friction ring 100 receive the restriction, chimb 120 and draw-in groove 240's cooperation mode is comparatively simple, only need aim at chimb 120 and exert pressure behind the draw-in groove 240 and can accomplish the cooperation, can not increase self-locking mechanism's the assembly degree of difficulty to draw-in groove 240 and chimb 120 cooperation have the positioning action, can directly reduce the internal diameter of friction ring 100 after the two accomplishes the cooperation, thereby has guaranteed the in close contact with between friction ring 100 and the solid of revolution.

If set up the draw-in groove on the friction ring, the chimb sets up on the mount pad, then can lead to the thickness of friction ring inhomogeneous, because the friction ring needs to carry out certain deformation, consequently the cooperation mode between draw-in groove and the chimb can not be interference fit, can leave certain clearance between the two, deformation can appear in the friction ring under the frictional force effect, especially has set up the position of draw-in groove, and the thin deformation variable of thickness here can be bigger to the cracked condition appears easily.

On the basis of the above embodiment, in another embodiment of the present invention:

the self-locking mechanism can realize bidirectional self-locking on the revolving body.

Referring to fig. 1, specifically, both ends of the friction ring 100 are provided with the flanges 120 which are clamped into the clamping grooves 240, after the flanges 120 are matched with the clamping grooves 240, the deformation degree of the connecting position of the flanges 120 on the friction ring 100 in the direction of the notch 110 can be limited, because the flanges 120 are arranged at both ends of the friction ring 100, the variation of the width of the notch 110 of the revolving body in the rotation process is limited, the situation that the revolving body rotates with the friction ring 100 is avoided, the width of the notch 110 is too large to reduce the braking force is avoided, and the flanges 120 are arranged at both ends of the friction ring 100, the braking force magnitude received is the same no matter the revolving body rotates positively or reversely, so that the bidirectional self-locking of the revolving body can be realized.

Referring to fig. 3, or, a plurality of chimbs 120 are arranged at the periphery of the friction ring 100 at intervals, a plurality of slots 240 are arranged on the mounting portion 210 corresponding to the plurality of chimbs 120, after the chimbs 120 and the slots 240 are matched in a one-to-one correspondence, each chimb 120 can limit the deformation amount of the friction ring 100, and the deformation amount of the whole friction ring 100 is limited by the chimbs 120 arranged at a plurality of intervals, so that no matter the revolution body is in forward rotation or reverse rotation, the deformation degree of the notch 110 does not change too much, and bidirectional self-locking of the revolution body is realized.

In addition, the self-locking mechanism can also realize the unidirectional self-locking of the revolving body.

Referring to fig. 2, specifically, one of them end in the both ends of friction ring 100 has set up chimb 120, so the deformation degree of this one end will be restricted, the other end then appears deformation under the drive of frictional force easily, friction ring 100's both ends have formed free end and stiff end promptly, when the solid of revolution rotates towards the stiff end, friction ring 100's free end can be close to the stiff end under the effect of frictional force, thereby can increase the size of brake force, when the solid of revolution rotates towards the free end, the stiff end is kept away from under the effect of frictional force to the free end, can reduce brake force, the resistance is littleer when the solid of revolution rotates, alright realize the one-way auto-lock to the solid of revolution.

Referring to fig. 5, in another embodiment of the present invention, the mounting seat 200 includes a ring-shaped base 201 and a plurality of brackets 202 spaced apart from each other on the circumference of the base 201, the plurality of brackets 202 are connected to each other through a bottom plate 203 to form a mounting portion 210, a certain distance is provided between two adjacent brackets 202, so that the brackets 202 can be offset from the base 201 by a certain angle and can better fit with a revolving body, and the mounting seat 200 with such a structure allows the base 201 to have a certain deformation amount, which can facilitate the mounting of the mounting seat 200 on the equipment.

Referring to fig. 6 to 8, the present invention further discloses a motor, which includes a driving shaft 300 and a housing 310, wherein the driving shaft 300 outputs the rotational power generated by the motor, and the motor is provided with the self-locking mechanism for self-locking the driving shaft 300. End cover 320 is fixedly installed at the end position of housing 310, be equipped with a plurality of convex fixture blocks 330 in the end cover 320, form clamping groove 340 between two adjacent fixture blocks 330, installation department 210 is gone into clamping groove 340, in order to restrict the circumferential direction of mount pad 200 through fixture block 330, friction ring 100 suit is on drive shaft 300, when drive shaft 300 normally rotates, drive shaft 300 can overcome its and friction ring 100 between frictional force, when the motor needs to stop, self-locking mechanism's braking force can make drive shaft 300 stop rotating fast, so can improve the accuracy of motor, improve its sensitivity.

The invention also discloses a linear actuator, which comprises the motor and the telescopic upright post driven by the motor to act. The linear actuator can generate power in the linear direction, an object is driven to move in the linear direction through the telescopic upright post, the linear actuator is usually applied to a lifting device to control lifting, the lifting device such as a lifting table and a lifting bed can bear a load through a self-locking mechanism arranged in the motor, the situation of returning under the action of external force is not easy to occur, the structure stability of the lifting device is kept, and meanwhile, the lifting distance of the lifting device can be controlled accurately by the linear actuator due to the sensitive control of the motor.

The conventional telescopic upright post has the telescopic speed of 35mm/s, the lead of the inner screw rod is 10+10, and the lead of the screw rod is small, so that the self-locking is realized by adopting a mode of a machine core, a torsion spring and the screw rod in a conventional mode. If the lifting speed of the conventional telescopic upright is lifted to 80-150 mm/s or the load of the conventional telescopic upright is increased to 4 times of static self-locking, if the self-locking is carried out in a mode of a machine core, a torsion spring and a screw rod, the rotating speed of a motor is accelerated and the noise is increased due to the fact that the lifting speed is accelerated. If the lead of the screw rod is changed to 20+20, the load test of the whole table has a descending phenomenon because the self-locking force of the screw rod is reduced. And the motor in the linear actuator has adopted the self-locking mechanism of this application, when elevating gear whole load, the lead screw helical pitch increases or when cancelling the torsional spring, can promote whole table load auto-lock.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in many different forms without departing from the spirit and scope of the invention as set forth in the following claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.