TWM630701U - Electric cylinder and centrifugal safety device thereof - Google Patents

Abstract

The utility model relates to an electric cylinder and its centrifugal safety device, wherein the safety device comprises an outer sleeve, an inner sleeve and a centrifugal assembly, the outer sleeve has a cavity, a blocking part and a first accommodating part; the inner sleeve is arranged on the outer sleeve The inside of the barrel has a raised part and a second accommodating part; the centrifugal assembly is arranged between the first accommodating part and the second accommodating part and includes a centrifugal block and an elastic element; the inner sleeve drives the centrifugal assembly to rotate, when the centrifugal block The centrifugal force of the centrifugal block is smaller than the elastic force of the elastic element, and the centrifugal block will be restricted in the second accommodating part by the elastic element, so that the inner sleeve can rotate inside the outer sleeve; when the centrifugal force of the centrifugal block is greater than the elastic force of the elastic element, the centrifugal block will move into The first accommodating part is clamped by the protruding part and the blocking part, so that the inner sleeve and the outer sleeve are linked together.

Description

Electric cylinder and its centrifugal safety device

The new model relates to the technical field of an electric cylinder, in particular to an electric cylinder and a centrifugal safety device thereof.

It is quite widespread and accepted by the public to install an electric cylinder (Linear Actuator) in various aspects such as electric hospital beds, treadmills or wheelchairs to adjust the elevation angle or position.

For example, US Patent Publication No. US5329657 discloses a hospital bed comprising an articulating support having a backrest portion movable between a horizontal position and a tilted position relative to the frame of the bed. The bed frame is supported by a reversible electric drive motor, and through a reduction gear device and a detachable coupling mechanism, the threaded shaft can be rotatably driven. The nut is engaged with the shaft and is held against rotation with the shaft, and a linkage connects the nut to the backrest portion to effect reciprocation of the backrest portion in response to reciprocation of the nut along the shaft. A manual release is provided on the backrest portion and disengages the releasable connection mechanism when actuated so that the threaded shaft can rotate freely independently of the motor and gear arrangement.

In addition, US Patent Publication No. US5346045 discloses an electric cylinder having a reversible electric motor that drives a threaded shaft engaged with a roller nut. A tubular housing connected to the nut has a base member and load securing lugs at its distal end. Hydraulic shock absorbers that provide linear deceleration are generally held in their loosest state, between the base member and the end of the spacer tube that abuts the nut. When the nut is within the shock absorber travel distance on the driven end of the shaft, the free end of the shaft presses the shock absorber against the base. When the nut is within the stroke distance of the shock absorber at the free end of the shaft, the ring engages the retaining ring, thereby maintaining the shock absorber body at a fixed distance from the free end of the shaft, and the spacer tube compresses the shock absorber. A centrifugal brake is provided on the drive coupling pulley and restricts the rotation of the shaft beyond a predetermined rate.

Also, US Patent Publication No. US2012240696A1 discloses an electric cylinder, a linear actuator with a reversible motor, which drives a non-self-locking spindle through a transmission, through which the tubular positioning element can be moved axially because one end of it is connected to the spindle on the mandrel nut. The actuator includes a transmission for moving the tubular positioning element from the motor and partly from the motor to the quick release to set the spindle to rotate by the load on the tubular positioning element. The actuator also includes braking means for controlling the speed of the tubular positioning element during the external load when the quick release means is activated. The braking device consists of a centrifugal brake in which the speed of descent is self-controlled when the quick release is activated.

One objective of the present invention is to provide an electric cylinder, which can reduce the impact force of the telescopic tube when it is rapidly retracted into the outer tube through the installation of the centrifugal safety device.

In order to achieve the above purpose, the present invention provides an electric cylinder, which includes an actuating body, a quick release mechanism and a centrifugal safety device. The actuating body includes a motor, a lead screw, an outer tube and a telescopic tube. The lead screw is driven by the motor to rotate, the outer tube is sleeved on the outside of the telescopic tube, and the telescopic tube and the lead screw are screwed to each other for transmission; the quick release mechanism is sleeved on the lead screw; the centrifugal safety device is sleeved Connected to the lead screw, the centrifugal safety device includes an outer sleeve, an inner sleeve and a centrifugal component, the outer sleeve has a cavity, and at least one blocking part is arranged in the cavity, and the blocking part is A first accommodating portion is formed on one side of the inner sleeve; the inner sleeve is arranged inside the outer sleeve, and at least one raised portion extends on the outer peripheral surface of the inner sleeve, and is formed on one side of the raised portion a second accommodating part; the centrifugal assembly includes at least one centrifugal block and at least one elastic element, the centrifugal block is movably disposed between the first accommodating part and the second accommodating part; wherein the guide The screw drives the inner sleeve and the centrifugal assembly to rotate. When the centrifugal force of the centrifugal block is less than the elastic force of the elastic element, the centrifugal block will be restricted in the second accommodating part by the elastic element, so that the inner The sleeve can rotate inside the outer sleeve; when the centrifugal force of the centrifugal block is greater than the elastic force of the elastic element, the centrifugal block will move into the first accommodating part and be clamped by the protruding part and the blocking part so that the inner sleeve and the outer sleeve are linked together.

One objective of the present invention is to provide a centrifugal safety device, which can prevent stalls during operation, thereby improving the safety of use.

In order to achieve the above purpose, the present invention provides a centrifugal safety device, which includes an outer sleeve, an inner sleeve and a centrifugal component, the outer sleeve has a cavity, and at least one blocking portion is arranged in the cavity. , a first accommodating part is formed on one side of the blocking part; the inner sleeve is arranged inside the outer sleeve, and at least one convex part extends on the outer peripheral surface of the inner sleeve, and the convex part A second accommodating part is formed on one side of the centrifugal assembly; the centrifugal assembly includes at least one centrifugal block and at least one elastic element, and the centrifugal block is movably arranged between the first accommodating part and the second accommodating part time; wherein the inner sleeve drives the centrifugal assembly to rotate, when the centrifugal force of the centrifugal block is less than the elastic force of the elastic element, the centrifugal block will be restricted in the second accommodating portion by the elastic element, thereby allowing the centrifugal block The inner sleeve can rotate inside the outer sleeve; when the centrifugal force of the centrifugal block is greater than the elastic force of the elastic element, the centrifugal block will move into the first accommodating part and be blocked by the raised part and the blocking part clamping, so that the inner sleeve and the outer sleeve are linked together.

The utility model also has the following functions. The installation of the centrifugal safety device makes the overall structure of the electric cylinder more compact, and can be installed on the sickbed. Centrifugal safety devices can be installed under the basic structure of the original electric cylinder, thereby shortening development time and reducing mold setup costs.

The detailed description and technical content of the present invention are described below in conjunction with the drawings. However, the accompanying drawings are only for reference and description, and are not intended to limit the present invention.

Please refer to FIGS. 1 to 11 , the present invention provides an electric cylinder and its centrifugal safety device, wherein the electric cylinder 1 mainly includes an actuating body 10 , a quick release mechanism 30 and a centrifugal safety device 50 .

Please refer to FIG. 1 and FIG. 2 first, the actuating body 10 mainly includes a housing 11 , a motor 12 , a lead screw 13 , an outer tube 14 and a telescopic tube 15 .

The housing base 11 mainly includes a lower housing 111 and an upper housing 112 corresponding to the lower housing 111 . The motor 12 is installed inside the lower casing 11 and has a worm 121 . The motor 12 can rotate the worm 121 in forward and reverse directions through the operation of the internal magnetic poles, coils and current.

Please refer to FIG. 6 and FIG. 7 together, the lead screw 13 is supported by a front bearing 16 and a rear bearing 17 so that the rear section of the lead screw 13 is formed in the upper housing 112 , and the rest of the lead screw 13 is The lead screw 13 on the rear side of the front bearing 16 is sleeved with a worm wheel 18 corresponding to the engagement of the aforementioned worm screw 121. The lead screw 13 in this embodiment is a non-self-locking lead screw. That is, when the telescopic tube 15 is restricted and cannot rotate, under the action of axial thrust or pressure on the telescopic tube 15, the lead screw 13 can be freely rotated relative to the telescopic tube 15, so that the telescopic tube 15 can be linearly rotated. displacement.

The outer tube 14 is sleeved along the outer periphery of the lead screw 13 , and one end of the outer tube 14 is covered and fixed by the lower casing 111 and the upper casing 112 together. A nut 151 (as shown in FIG. 2 ) is connected to the end of the telescopic tube 15 , wherein the telescopic tube 15 is sleeved on the outer periphery of the lead screw 13 , and is screwed with the lead screw 13 through its nut 151 .

Please continue to refer to FIG. 7 , the quick release mechanism 30 mainly includes a positioning wheel 31 and a clutch wheel 32. The positioning wheel 31 is sleeved and fixed on the lead screw 13, so that the positioning wheel 31 can follow the lead screw 13 to rotate. The clutch wheel 32 is sleeved on the lead screw 13 through a guide element 33 and formed on one side of the positioning wheel 31. The clutch wheel 32 can move axially on the guide element 33, wherein the lead screw 13 passes through the motor 12. Therefore, when the clutch wheel 32 and the positioning wheel 31 are engaged, the positioning wheel 31 is driven by the lead screw 13 together with the clutch wheel 32 to rotate; in the clutch wheel 32 and the positioning wheel 31 During separation, the lead screw 13 will rotate freely under the action of the thrust force of the telescopic tube 15 .

The positioning wheel 31 and the clutch wheel 32 are both substantially cylindrical, and are provided with a plurality of convex keys and a plurality of accommodating keyways, and each convex key system can be embedded in each accommodating keyway (not shown in the figure), so that the clutch wheel 32 can be operated Separation or engagement occurs correspondingly to the positioning wheel 31 .

Please refer to FIG. 1 and FIG. 7 again, the quick-release mechanism 30 of this embodiment further includes a pull-pull assembly 34, and the pull-pull assembly 34 mainly includes a trigger (not numbered), and one end of the trigger is pivotally connected to the The upper casing 112 is outside and penetrated by a bolt. Through the operation of the trigger, the clutch wheel 32 and the positioning wheel 31 can be connected or disconnected. When the clutch wheel 32 and the positioning wheel 31 are connected, the lead screw 13, the positioning wheel 31, the clutch wheel 32, the guide element 33 and the worm wheel 18 rotate together . When the clutch wheel 32 and the positioning wheel 31 are disengaged, the lead screw 13 rotates together with the positioning wheel 31, and the clutch wheel 32, the guide element 33 and the worm wheel 18 do not rotate.

Please continue to refer to FIGS. 3 to 6 . The centrifugal safety device 50 of this embodiment is sleeved on the lead screw 13 and formed on one side of the quick release mechanism 30 . The centrifugal safety device 50 of this embodiment is located on the side of the quick release mechanism 30 . The front side of the front bearing 16 mainly includes an outer sleeve 51 , an inner sleeve 53 and a centrifugal assembly 55 .

The outer sleeve 51 of this embodiment is a cylindrical body, which has a cavity 511 , and a plurality of blocking parts 512 extend radially in the cavity 511 toward the axis thereof. Each blocking part of this embodiment 512 is a stopper, but it is not limited to this type. Each stopper 512 is arranged at equal intervals, and a first accommodating part 513 is formed between any two adjacent stoppers 512. In this embodiment Each of the first accommodating portions 513 is a groove, but not limited to this type. In addition, two positioning bars 514 extend radially away from the axis on the outer peripheral surface of the outer sleeve 51 , and the aforementioned outer tube 14 is respectively provided with a positioning groove 141 for each positioning bar 514 to be embedded and fixed. In addition, the blocking portion 512 may also be a single type, and the first accommodating portion 513 is formed on one side of the blocking portion 512 .

The inner sleeve 53 in this embodiment is also a cylindrical body, which is arranged inside the outer sleeve 51 , and a plurality of protrusions 531 extend radially away from the axis on the outer peripheral surface of the inner sleeve 53 . Each protruding portion 531 in the embodiment is a protruding strip, but it is not limited to this type. Each protruding portion 531 is arranged at equal intervals, and a second protruding portion 531 is formed between any two adjacent protruding portions 531 . Two accommodating portions 532, each of the second accommodating portions 532 in this embodiment is also a groove, but not limited to this type. In addition, a locking slot 534 is provided in the middle position of each protruding portion 531 . In addition, a positioning plane 533 is provided inside the inner sleeve 53 , and the positioning plane 533 is used to cooperate with the positioning plane 131 (as shown in FIG. 5 ) of the lead screw 13 . In addition, the numbers of the protruding portions 531 and the second accommodating portions 532 are set in accordance with the numbers of the aforementioned blocking portions 512 and the first accommodating portions 513 .

The centrifugal component 55 can be a single type, or can be arranged in plural as in this embodiment, and it is movably arranged between the first accommodating portion 513 and the second accommodating portion 532 . The centrifugal assembly 55 mainly includes a centrifugal block 551 and two elastic elements 555. The axial section of the centrifugal block 551 is roughly stepped, and the thickness of the two side ends of the centrifugal block 551 is smaller than the thickness of the middle section, and the two ends of the centrifugal block 551 are respectively A blind hole 552 is provided. The elastic element 555 in this embodiment is a compression spring. A part of each elastic element 555 is accommodated in the blind hole 552 , and another part of the elastic element protrudes out of the blind hole 552 . In addition, the elastic element 555 can also be of a single type. In addition, each centrifugal assembly 55 may also be a type composed of a plurality of centrifugal blocks 551 and an elastic element 555 (not shown in the figure).

In one embodiment, the centrifugal safety device 50 of this embodiment further includes a front cap 57 and a rear cap 59. The front cap 57 and the rear cap 59 cover the inner sleeve 53 and each centrifugal The first and last ends of the assembly 55 are provided with a flat surface 591 inside the rear cap 59 respectively for one end of each elastic element 555 to abut against; A clip 592 of the slot 534. Similarly, the front cap 57 is also provided with the aforementioned flat veneer and clips (not shown).

In one embodiment, the inner sleeve 53 of the centrifugal safety device 50 is sleeved corresponding to the lead screw 13 , and a washer 65 is installed on the side of the front cap 57 to balance the force of the centrifugal safety device 50 . .

Please refer to FIG. 1 and FIG. 2 again. In one embodiment, the electric cylinder 1 of the present invention further includes a rear support 70 and a front support 75. The rear support 70 is sleeved with the rear bearing 17 and is mounted on The housing 112 and the lower housing 111 are fixed, and the front support 75 is sleeved on the end of the telescopic tube 15 away from the nut 151 .

During operation, the rear support 70 and the front support 75 are respectively fixed on an electric hospital bed (not shown in the figure), the rotation of the worm 121 is used to drive the worm wheel 18 to rotate, and the worm wheel 18 drives the lead screw 13 to rotate. The telescopic tube 15 is constrained by the outer tube 14, so during the rotation of the lead screw 13, the telescopic tube 15 will move linearly in the axial direction relative to the lead screw 13, thereby causing the front section of the electric hospital bed to move up.

Please refer to FIG. 8 to FIG. 11 together. When the patient must lie down to perform electric shocks and other actions during the first aid process, the clutch wheel 32 and the positioning wheel 31 are separated by the rotation of the pull-pull assembly 34 . Using the patient's own weight or medical staff to exert a force on the front section of the electric hospital bed, after the telescopic tube 15 bears the aforementioned force, the lead screw 13 will be rapidly rotated and retracted into the outer tube 14, and the inner sleeve 53 will be retracted into the outer tube 14. The lead screw 13 will rotate together with the centrifugal assembly 55. When the centrifugal force of the centrifugal block 551 is smaller than the elastic force of the elastic element 555, the centrifugal block 551 will be restricted in the second accommodating portion 532 by the elastic element 555, thereby The inner sleeve 53 is allowed to rotate freely inside the outer sleeve 51 (as shown in Fig. 9).

When the centrifugal force when the centrifugal block 551 rotates is greater than the elastic force of the elastic element 555, the centrifugal block 551 will partially move into the first accommodating portion 513 and be jointly clamped by the protruding portion 531 and the blocking portion 512, so that the inner sleeve The cylinder 53 and the outer sleeve 51 are linked together, and the inner sleeve 53 and the outer sleeve 51 in this embodiment rotate together (as shown in FIG. 11 ). When the sleeve 51 remains stationary, the rotation of the inner sleeve 53 will be stopped by the outer sleeve 51, so that the centrifugal safety device 50 can absorb the impact force of the telescopic tube 15 when it falls rapidly, so that the Reduce the damage to the patient and improve the user's comfort.

In one embodiment, the novel centrifugal safety device 50 can be used not only in the aforementioned electric cylinder 1, but also in various fields such as the shaving of the turbine or the fracture of the motor shaft, which can prevent Stall situation during operation, and then effectively play a safety protection mechanism.

Please refer to FIGS. 12 and 13 , the centrifugal safety device 50A of the present embodiment, in addition to the features of the previous embodiments, also includes a deceleration spring 60 which is fastened on the outer peripheral surface of the outer sleeve 51 , And the deceleration spring 60 has a positioning arm 61 extending outward. The positioning arm 61 is used for passing through and being fixed on the housing seat 11 . When the centrifugal safety device 50A is installed on the electric cylinder 1 , the inner sleeve 53 is used to sleeve On the lead screw 13, the positioning plane 131 and the positioning plane 533 are attached to each other (refer to FIG. 11), so that the inner sleeve 53 is driven to rotate by the lead screw 13, and the centrifugal block 551 is partially moved into the first accommodating part 513, and are jointly clamped by the raised part 531 and the blocking part 512, so that when the inner sleeve 53 and the outer sleeve 51 rotate together, the frictional force is formed on the inner peripheral surface of the deceleration spring 60 and the outer sleeve 51. Between the outer peripheral surfaces of the outer sleeves 51 are braked or decelerated by the deceleration spring 60 .

Please refer to FIGS. 14 and 15 , the difference between the centrifugal safety device 50B of this embodiment and the previous embodiments is that one end edge of the outer sleeve 51B expands and extends outward with a convex ring 515, and the inner sleeve 53B has a convex ring 515. Each protruding portion 531 is provided with two radial insert grooves 535, and an edge of one end of the inner sleeve 53B also expands and extends outward with a convex ring 536, and the interior of the inner sleeve 53B is provided with the aforementioned lead screw 13 for positioning A positioning plane 533 to which the plane 131 is attached. Each centrifugal block 551B of the centrifugal assembly 55B is also provided with two radial insertion grooves 553 . The elastic element 555B in this embodiment is a C-shaped ring, and each elastic element 555B is buckled corresponding to the aforementioned radial insertion grooves 535 and 553 respectively. The deceleration spring 60 is fastened on the outer peripheral surface of the outer sleeve 51B and attached to the side of the convex ring 515 .

To sum up, the new electric cylinder and its centrifugal safety device of the present invention can indeed achieve the intended purpose of use, and solve the deficiencies of the conventional knowledge. Moreover, because of its novelty and progress, it fully meets the requirements for a new type of patent application. If you file an application under the Patent Law, please check carefully and grant the patent in this case to protect the rights of new creators.

1: Electric cylinder 10: Actuating the body 11: Shell seat 111: Lower shell 112: Upper shell 113: Stopper 12: Motor 121: Worm 13: Lead screw 131: Positioning plane 14: Outer tube 141: Positioning slot 15: Telescopic tube 151: Nut 16: Front bearing 17: Rear bearing 18: worm gear 30: Quick Release Mechanisms 31: Positioning wheel 32: clutch wheel 33: Guide element 34: Pull assembly 50, 50A, 50B: Centrifugal safety device 51, 51B: Outer sleeve 511: Cavity 512: Stopper 513: First accommodating part 514: Positioning bar 515: convex ring 53, 53B: Inner sleeve 531: Raised part 532: Second accommodating part 533: Orientation plane 534: Card slot 535: Radial Groove 536: convex ring 55, 55B: Centrifugal components 551, 551B: Centrifugal block 552: Blind hole 553: Radial Groove 555, 555B: elastic elements 57: Front cap 59: Back Cap 591: Flat veneer 592: Card Strip 60: deceleration spring 61: Positioning arm 65: Gasket 70: Rear support 75: Front mount

Figure 1 is a three-dimensional appearance view of the new electric cylinder.

FIG. 2 is a schematic diagram of the actuating body assembly of the present invention.

Figure 3 is an exploded view of the new centrifugal safety device.

Figure 4 is a schematic diagram of the combination of the new centrifugal safety device.

Figure 5 is an exploded view of the new lead screw, outer tube and centrifugal safety device.

Figure 6 is a schematic diagram of the combination of lead screw, outer tube and centrifugal safety device of this new type.

Figure 7 is a sectional view of the combination of lead screw, outer tube and centrifugal safety device of this new type.

Figure 8 is a cross-sectional view of the new lead screw, outer tube and centrifugal safety device from another direction.

Figure 9 is a sectional view (1) of the lead screw, outer tube and centrifugal safety device of the new type in use state.

Figure 10 is a sectional view (2) of the lead screw, outer tube and centrifugal safety device of the new model in use.

Figure 11 is a sectional view (3) of the lead screw, outer tube and centrifugal safety device of the new type in use state.

Figure 12 is an exploded view of another embodiment of the novel centrifugal safety device.

Figure 13 is a sectional view of the new centrifugal safety device applied to the electric cylinder combination.

Figure 14 is an exploded view of another embodiment of the novel centrifugal safety device.

Fig. 15 is a schematic diagram of the combination of another embodiment of the novel centrifugal safety device.

50: Centrifugal safety device

51: Outer sleeve

511: Cavity

512: Stopper

513: First accommodating part

514: Positioning bar

53: Inner sleeve

531: Raised part

532: Second accommodating part

533: Orientation plane

534: Card slot

55: Centrifugal components

551: Centrifugal block

552: Blind hole

555: Elastic element

57: Front cap

59: Back Cap

591: Flat veneer

592: Card Strip

Claims (20)

An electric cylinder, comprising: An actuating body, including a motor, a lead screw, an outer tube and a telescopic tube, the lead screw is driven by the motor to rotate, the outer tube is sleeved outside the telescopic tube, the telescopic tube is connected to the lead screw Mutual screw drive; a quick release mechanism sleeved on the lead screw; and A centrifugal safety device is sleeved on the lead screw, and the centrifugal safety device includes: an outer sleeve with an accommodating cavity, at least one blocking portion is arranged in the accommodating cavity, and a first accommodating portion is formed on one side of the blocking portion; an inner sleeve, disposed inside the outer sleeve, at least one protruding portion extends from the outer peripheral surface of the inner sleeve, and a second accommodating portion is formed on one side of the protruding portion; and a centrifugal assembly, comprising at least one centrifugal block and at least one elastic element, the centrifugal block is movably disposed between the first accommodating part and the second accommodating part; The lead screw drives the inner sleeve and the centrifugal assembly to rotate. When the centrifugal force of the centrifugal block is smaller than the elastic force of the elastic element, the centrifugal block will be restricted in the second accommodating portion by the elastic element, thereby Allow the inner sleeve to rotate inside the outer sleeve; when the centrifugal force of the centrifugal block is greater than the elastic force of the elastic element, the centrifugal block will move into the first accommodating portion and be moved by the raised portion and the The stopper is clamped, so that the inner sleeve and the outer sleeve are linked together. The electric cylinder of claim 1, further comprising a deceleration spring, the deceleration spring tightening the outer sleeve, and the deceleration spring has a positioning arm, the actuating body further comprises a housing, the positioning arm fixed to the housing. The electric cylinder of claim 1, wherein the blocking portion and the protruding portion are plural, and each blocking portion is a blocking block, and each protruding portion is a protruding strip. The electric cylinder according to claim 3, wherein the centrifugal components are plural, and the centrifugal safety device further comprises a front cap and a rear cap, the front cap and the rear cap are respectively covered on the inner sleeve Both ends of the cartridge and each of the centrifuge assemblies. The electric cylinder as claimed in claim 4, wherein the rear cap is provided with a flat surface for one end of each elastic element to abut against. The electric cylinder according to claim 5, wherein the cross section of the centrifugal block is a stepped shape, the thickness of the two side ends of the centrifugal block is smaller than the thickness of the middle section, and a blind hole is respectively provided at the two side ends of the centrifugal block, the The elastic element is a compression spring, and the other end of each compression spring is accommodated in the blind hole. The electric cylinder as claimed in claim 4, wherein each of the protruding portions is provided with a locking groove, and a locking bar embedded in each of the locking grooves extends from the inside of the rear cap. The electric cylinder of claim 4, further comprising a washer, which is sleeved on the lead screw and formed on the side of the front cap. The electric cylinder of claim 3, wherein each of the protruding parts is provided with a plurality of radial insert grooves, the centrifugal components are plural, each of the centrifugal blocks is provided with a plurality of other radial insert grooves, and the elastic element is a C-shaped Each of the C-shaped rings is respectively corresponding to each of the radial insert grooves and each of the other radial insert grooves to be fastened. The electric cylinder according to claim 9, further comprising a deceleration spring, one end of the outer sleeve expands and extends a convex ring, the deceleration spring is fastened to the outer sleeve and attached to the side of the convex ring. The electric cylinder of claim 10, wherein the deceleration spring has a positioning arm, the actuating body further comprises a housing, and the positioning arm is fixed on the housing. The electric cylinder according to claim 1, wherein a plurality of positioning bars extend from the outer peripheral surface of the outer sleeve, and the outer tube is provided with a positioning groove respectively for each of the positioning bars to be embedded and fixed. A centrifugal safety device comprising: an outer sleeve with an accommodating cavity, at least one blocking portion is arranged in the accommodating cavity, and a first accommodating portion is formed on one side of the blocking portion; an inner sleeve, disposed inside the outer sleeve, at least one protruding portion extends from the outer peripheral surface of the inner sleeve, and a second accommodating portion is formed on one side of the protruding portion; and a centrifugal assembly, comprising at least one centrifugal block and at least one elastic element, the centrifugal block is movably disposed between the first accommodating part and the second accommodating part; The inner sleeve drives the centrifugal assembly to rotate. When the centrifugal force of the centrifugal block is smaller than the elastic force of the elastic element, the centrifugal block will be restricted in the second accommodating portion by the elastic element, thereby allowing the inner sleeve to rotate. The cylinder can rotate inside the outer sleeve; when the centrifugal force of the centrifugal block is greater than the elastic force of the elastic element, the centrifugal block will move into the first accommodating part and be clamped by the protruding part and the blocking part , so that the inner sleeve and the outer sleeve are linked. The centrifugal safety device as claimed in claim 13, wherein the blocking portion and the protruding portion are plural, and each blocking portion is a blocking block, and each protruding portion is a protruding strip. The centrifugal safety device as claimed in claim 14, wherein the centrifugal components are plural, the centrifugal safety device further comprises a front cap and a rear cap, the front cap and the rear cap are respectively covered on the The inner sleeve and each of the two ends of the centrifugal assembly. The centrifugal safety device as claimed in claim 15, wherein the interior of the rear cap is provided with a flat surface against which one end of each of the elastic elements is respectively abutted. The centrifugal safety device as claimed in claim 16, wherein the cross section of the centrifugal block is in a stepped shape, the thickness of the two side ends of the centrifugal block is smaller than the thickness of the middle section, and a blind hole is respectively provided at the two side ends of the centrifugal block , the elastic element is a compression spring, and the other end of each compression spring is accommodated in the blind hole. The centrifugal safety device as claimed in claim 15, wherein each of the protruding portions is provided with a locking groove, and a locking bar respectively embedded in each of the locking grooves extends from the inside of the rear cap. The centrifugal safety device as claimed in claim 14, wherein each of the protruding parts is provided with a plurality of radial insert grooves, the number of centrifugal components is plural, each of the centrifugal blocks is provided with a plurality of other radial insert grooves, and the elastic element is a C-shaped rings, each of the C-shaped rings is respectively corresponding to each of the radial insert grooves and each of the other radial insert grooves. The centrifugal safety device of claim 13, further comprising a deceleration spring, the deceleration spring tightening the outer sleeve.

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