Electric cylinder and centrifugal safety device therefor

Abstract

The application discloses an electric cylinder and a centrifugal safety device thereof. 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 inside the outer sleeve and has a protruding part and a second accommodating part. The centrifugal assembly is arranged between the first accommodating part and the second accommodating part and comprises a centrifugal block and an elastic element. 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 is limited 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 moves into the first accommodating part and is clamped by the protruding part and the blocking part, so that the inner sleeve and the outer sleeve are connected.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of electric cylinder, in particular to an electric cylinder and a centrifugal safety device thereof. BACKGROUND

[0002] Electric cylinders (Linear Actuator) are installed in various aspects such as electric beds, treadmills or wheelchairs, etc. to adjust the angle size or the height of the position, which is quite extensive and accepted by the public.

[0003] U.S. Patent No. US5329657 discloses a bed comprising a hingably mounted frame having a backrest portion movable between a horizontal position and an inclined position relative to a frame of the bed. The bed frame supports a reversible electric drive motor which through a reduction gear arrangement and a detachable coupling mechanism rotatably drives a threaded shaft. A nut is engaged with the shaft and held against rotation with the shaft, and a linkage connects the nut to the backrest portion to effect reciprocal movement of the backrest portion in response to reciprocal movement of the nut along the shaft. A manual release device is provided on the backrest portion and, when actuated, disengages the releasable coupling mechanism so that the threaded shaft can be freely rotated independent of the motor and gear arrangement.

[0004] In addition, U.S. Patent No. US5346045 discloses an electric cylinder having a reversible electric motor driving a threaded shaft engaged with a roller nut. A tubular housing connected to the nut has a base member and a load securing lug at its distal end. A hydraulic shock absorber providing linear deceleration is normally held in its most relaxed state between the base member and the end of a spacer tube abutting the nut. When the nut is within the shock absorber travel distance of the shaft driven end, the free end of the shaft compresses the shock absorber against the base. When the nut is within the shock absorber travel distance of the shaft free end, a ring engages a stop ring to hold the shock absorber body a fixed distance from the free end of the shaft, the spacer tube compressing the shock absorber. A centrifugal brake is provided on the drive coupling pulley and limits rotation of the shaft beyond a predetermined rate.

[0005] In addition, U.S. Patent No. US2012240696A1 discloses an electric cylinder with a linear actuator with a reversible electric motor driving a non-self-locking spindle through a transmission, which allows axial movement of a tubular positioning element connected at one end to a spindle nut on a spindle. The actuator comprises a transmission for moving the tubular positioning element from the electric motor and partly from the electric motor to a quick release device, which sets the spindle to rotate through the tubular positioning element by a load on it. The actuator also comprises a brake device for controlling the speed of the tubular positioning element during an external load when the quick release device is activated. The brake device consists of a centrifugal brake, in which the speed of descent is self-controlled when the quick release device is activated. SUMMARY

[0006] An object of the present application is to provide an electric cylinder, which can reduce the impact force of a telescopic tube when it is quickly retracted into an outer tube by the provision of a centrifugal safety device.

[0007] To achieve the above object, the present application provides an electric cylinder, which comprises a driving body, a quick release mechanism and a centrifugal safety device. The driving body comprises an electric motor, a lead screw, an outer tube and a telescopic tube. The lead screw is driven to rotate by the electric motor. The outer tube is sleeved outside the telescopic tube. The telescopic tube is in screw transmission with the lead screw. The quick release mechanism is sleeved with the lead screw. The centrifugal safety device is sleeved with the lead screw. The centrifugal safety device comprises an outer sleeve, an inner sleeve and a centrifugal component. The outer sleeve has a cavity. At least one stopper is arranged in the cavity. A first accommodating portion is formed at one side of the stopper. The inner sleeve is arranged inside the outer sleeve. At least one protrusion is arranged on the outer circumferential surface of the inner sleeve. A second accommodating portion is formed at one side of the protrusion. The centrifugal component comprises at least one centrifugal block and at least one elastic element. The centrifugal block is movably arranged between the first accommodating portion and the second accommodating portion. The lead screw drives the inner sleeve and the centrifugal component to rotate. When the centrifugal force of the centrifugal block is less than the elastic force of the elastic element, the centrifugal block is limited in the second accommodating portion 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 moves into the first accommodating portion and is clamped by the protrusion and the stopper, so that the inner sleeve and the outer sleeve are connected.

[0008] Optionally, a deceleration spring is further arranged to tightly bind the outer sleeve. The deceleration spring has a positioning arm. The driving body further comprises a shell seat. The positioning arm is fixed on the shell seat.

[0009] Optionally, the stopper and the protrusion are both plural. Each stopper is a stop block. Each protrusion is a protruding strip.

[0010] Optionally, the centrifugal component is plural. The centrifugal safety device further comprises a front cap and a rear cap. The front cap and the rear cap cover the two ends of the inner sleeve and the centrifugal components respectively.

[0011] Optionally, the inner part of the rear cap is provided with a flat surface for the one end of each elastic element to abut.

[0012] Optionally, the cross section of the centrifugal block is in a stepped shape. The thickness of the two side ends of the centrifugal block is less than the thickness of the middle section. A blind hole is arranged at each side end of the centrifugal block. The elastic element is a compression spring. The other end of each compression spring is accommodated in the blind hole.

[0013] Optionally, each of the protrusions is provided with a clamping groove, and the inner portion of the rear cap is extended with a clamping strip embedded in each of the clamping grooves.

[0014] Optionally, a gasket is further included, which is sleeved on the lead screw and formed on the side of the front cap.

[0015] Optionally, each of the protrusions is provided with a plurality of radial embedding grooves, the centrifugal assembly is a plurality of centrifugal blocks, each of the centrifugal blocks is provided with a plurality of another radial embedding grooves, and the elastic element is a C-shaped ring, each of the C-shaped rings is buckled to correspond to each of the radial embedding grooves and each of the another radial embedding grooves.

[0016] Optionally, a deceleration spring is further included, one end of the outer sleeve is extended with a protruding ring, and the deceleration spring is tightly sleeved on the outer sleeve and attached to the side of the protruding ring.

[0017] Optionally, the deceleration spring has a positioning arm, and the actuating body further includes a housing seat, and the positioning arm is fixed on the housing seat.

[0018] Optionally, the outer circumferential surface of the outer sleeve is extended with a plurality of positioning strips, and the outer tube is provided with a positioning groove for embedding and fixing each of the positioning strips.

[0019] Another object of the present application is to provide a centrifugal safety device, which can prevent the stalling condition during operation, thereby improving the safety of use.

[0020] In order to achieve the above-mentioned objects, the present application provides a centrifugal safety device, which comprises an outer sleeve, an inner sleeve and a centrifugal assembly, the outer sleeve has a cavity, at least one blocking portion is arranged in the cavity, and a first accommodating portion is formed on one side of the blocking portion; the inner sleeve is arranged inside the outer sleeve, at least one protrusion is extended on the outer circumferential surface of the inner sleeve, and a second accommodating portion is formed on one side of the protrusion; the centrifugal assembly comprises at least one centrifugal block and at least one elastic element, the centrifugal block is movably arranged between the first accommodating portion and the second accommodating portion; 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 is restricted in the second accommodating portion 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 moves into the first accommodating portion and is clamped by the protrusion and the blocking portion, so that the inner sleeve and the outer sleeve are connected.

[0021] The present application also has the following effects: the centrifugal safety device is arranged on the electric cylinder, so that the overall structure of the electric cylinder is more compact; the centrifugal safety device is arranged on the basis of the original electric cylinder structure, thereby shortening the development time and reducing the cost of mold setting. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 For the electric cylinder of the present invention.

[0023] Figure 2 For the actuating body combination of the present invention.

[0024] Figure 3 For the centrifugal safety device exploded view of the present invention.

[0025] Figure 4 For the centrifugal safety device combination of the present invention.

[0026] Figure 5 For the lead screw, outer tube and centrifugal safety device exploded view of the present invention.

[0027] Figure 6 For the lead screw, outer tube and centrifugal safety device combination of the present invention.

[0028] Figure 7 For the lead screw, outer tube and centrifugal safety device combination of the present invention.

[0029] Figure 8 For the lead screw, outer tube and centrifugal safety device another direction of the present invention.

[0030] Figure 9 For the lead screw, outer tube and centrifugal safety device use state of the present invention.

[0031] Figure 10 For the lead screw, outer tube and centrifugal safety device use state of the present invention.

[0032] Figure 11 For the lead screw, outer tube and centrifugal safety device use state of the present invention.

[0033] Figure 12 For the centrifugal safety device another embodiment of the present invention.

[0034] Figure 13 For the centrifugal safety device applied to the electric cylinder combination of the present invention.

[0035] Figure 14 For the centrifugal safety device another embodiment of the present invention.

[0036] Figure 15 For the centrifugal safety device another embodiment of the present invention.

[0037] In the figure:

[0038] 1: electric cylinder; 10: actuating body; 11: housing; 111: lower housing; 112: upper housing; 113: stop; 12: motor; 121: worm; 13: lead screw; 131: locating plane; 14: outer tube; 141: locating groove; 15: telescopic tube; 151: nut; 16: front bearing; 17: rear bearing; 18: worm wheel; 30: quick release mechanism; 31: locating wheel; 32: clutch wheel; 33: guide element; 34: pulling assembly; 50, 50A, 50B: centrifugal safety device; 51, 51B: outer sleeve; 511: cavity; 512: stop; 513: first receiving portion; 514: locating bar; 515: protruding ring; 53, 53B: inner sleeve; 531: protruding portion; 532: second receiving portion; 533: locating plane; 534: clamping groove; 535: radial recess; 536: protruding ring; 55, 55B: centrifugal assembly; 551, 551B: centrifugal block; 552: blind hole; 553: radial recess; 555, 555B: elastic element; 57: front cap; 59: rear cap; 591: flat surface; 592: clamping bar; 60: deceleration spring; 61: locating arm; 65: gasket; 70: rear support; 75: front support. DETAILED DESCRIPTION

[0039] The present application will be further described with reference to the drawings and specific examples, which are intended to be illustrative only and not limiting of the present application.

[0040] Referring to Figures 1 to 11 The present application provides an electric cylinder and a centrifugal safety device thereof, wherein the electric cylinder 1 mainly comprises an actuating body 10, a quick release mechanism 30 and a centrifugal safety device 50.

[0041] Referring to Figure 1 and Figure 2 The actuating body 10 mainly comprises a housing 11, a motor 12, a lead screw 13, an outer tube 14 and a telescopic tube 15.

[0042] The housing 11 mainly comprises a lower housing 111 and an upper housing 112 corresponding to the lower housing 111. The motor 12 is installed inside the lower housing 11, and has a worm 121. The motor 12 can generate rotation in the forward and reverse directions by the operation of the internal magnetic pole, coil and current.

[0043] Referring to Figure 6 and Figure 7As shown, 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 protrudes outside the housing base 11. A worm wheel 18 is sleeved on the lead screw 13 behind the front bearing 16, and is engaged with the worm 121. The lead screw 13 in this embodiment is a non-self-locking lead screw. When the telescopic tube 15 is restricted from rotating, the telescopic tube 15 will rotate freely relative to the lead screw 13 under the axial thrust or pressure, so as to generate linear displacement.

[0044] The outer tube 14 is sleeved along the outer periphery of the lead screw 13, and one end of the outer tube 14 is fixed by the lower housing 111 and the upper housing 112. Figure 2 As shown, the telescopic tube 15 is sleeved on the outer periphery of the lead screw 13, and is screwed with the lead screw 13 through the screw cap 151.

[0045] Please refer to Figure 7 As shown, 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 rotate with the lead screw 13. The clutch wheel 32 is sleeved on the lead screw 13 through a guide element 33 and is formed on one side of the positioning wheel 31. The clutch wheel 32 can axially move on the guide element 33. The lead screw 13 is driven by the engagement of the worm 121 of the motor 12 and the worm wheel 18. Therefore, when the clutch wheel 32 and the positioning wheel 31 are engaged, the positioning wheel 31 rotates with the clutch wheel 32 driven by the lead screw 13. When the clutch wheel 32 and the positioning wheel 31 are separated, the telescopic tube 15 will rotate freely under the thrust of the lead screw 13.

[0046] The positioning wheel 31 and the clutch wheel 32 are substantially cylindrical, and are provided with a plurality of (more than two) keys and a plurality of key grooves. Each key can be embedded in each key groove (not shown in the figure), so that the clutch wheel 32 can be operatively separated or engaged with the positioning wheel 31.

[0047] Please refer to Figure 1 and Figure 7As shown, the quick release mechanism 30 of the present embodiment further comprises a pulling assembly 34, which mainly includes a pulling handle (not numbered). One end of the pulling handle is pivotally connected to the outside of the upper housing 112 and is penetrated by a bolt. The pulling handle can be operated to connect or disconnect the clutch wheel 32 and the positioning wheel 31. 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 disconnected, 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.

[0048] Please continue to refer to Figures 3 to 6 As shown, the centrifugal safety device 50 of the present embodiment is sleeved on the lead screw 13 and is formed on one side of the quick release mechanism 30. The centrifugal safety device 50 of the present embodiment is located on the front side of the front bearing 16 and mainly includes an outer sleeve 51, an inner sleeve 53 and a centrifugal assembly 55.

[0049] The outer sleeve 51 of the present embodiment is a cylindrical body having a cavity 511. A plurality of blocking portions 512 extend radially toward the axis of the cavity 511. Each blocking portion 512 of the present embodiment is a blocking block, but is not limited to this type. The blocking portions 512 are arranged at equal intervals. A first accommodating portion 513 is formed between any two adjacent blocking portions 512. Each first accommodating portion 513 of the present embodiment is a groove, but is not limited to this type. Two positioning strips 514 extend radially away from the axis of the outer sleeve 51. The outer tube 14 is provided with a positioning groove 141 for embedding and fixing each positioning strip 514. In addition, the blocking portions 512 can be a single type, and the first accommodating portion 513 is formed on one side of the blocking portion 512.

[0050] The inner sleeve 53 of the present embodiment is also a cylindrical body arranged inside the outer sleeve 51. A plurality of protruding portions 531 extend radially away from the axis of the inner sleeve 53. Each protruding portion 531 of the present embodiment is a protruding strip, but is not limited to this type. The protruding portions 531 are arranged at equal intervals. A second accommodating portion 532 is formed between any two adjacent protruding portions 531. Each second accommodating portion 532 of the present embodiment is also a groove, but is not limited to this type. A clamping groove 534 is arranged at the middle position of each protruding portion 531. A positioning plane 533 is arranged inside the inner sleeve 53. The positioning plane 533 is used to cooperate with the positioning plane 131 (as shown) of the lead screw 13. In addition, the number of the protruding portions 531 and the second accommodating portions 532 is arranged in cooperation with the number of the blocking portions 512 and the first accommodating portions 513. Figure 5

[0051] ​The centrifugal assembly 55 can be single or multiple as in the embodiment, and is movably arranged between the first accommodating portion 513 and the second accommodating portion 532. Each centrifugal assembly 55 in the embodiment mainly comprises a centrifugal block 551 and two elastic elements 555. The axial section of the centrifugal block 551 is substantially in a stepped shape, and the thickness of the two end portions of the centrifugal block 551 is smaller than that of the middle portion. A blind hole 552 is arranged at each end portion of the centrifugal block 551. The elastic element 555 in the embodiment is a compression spring. A part of the elastic element 555 is accommodated in the blind hole 552, and the other part is protruded outside the blind hole 552. In addition, the elastic element 555 can also be single. In addition, each centrifugal assembly 55 can also be composed of multiple centrifugal blocks 551 and an elastic element 555 (not shown in the figure).

[0052] In an embodiment, the centrifugal safety device 50 further comprises a front cap 57 and a rear cap 59. The front cap 57 and the rear cap 59 cover the front end and the rear end of the inner sleeve 53 and the centrifugal assembly 55 respectively. A flat surface 591 is arranged inside the rear cap 59 for abutting one end of the elastic element 555. A clamping strip 592 is arranged inside the rear cap 59 for clamping the clamping groove 534.

[0053] In an embodiment, a gasket 65 is arranged on the side of the front cap 57 corresponding to the sleeve of the lead screw 13, so as to balance the stress of the centrifugal safety device 50.

[0054] Please refer to Figure 1 and Figure 2 In an embodiment, the electric cylinder 1 further comprises a rear support 70 and a front support 75. The rear support 70 is sleeved on the rear bearing 17 and is fixed by the upper shell 112 and the lower shell 111. The front support 75 is sleeved on the telescopic tube 15 away from the nut 151.

[0055] In operation, the rear support 70 and the front support 75 are fixed on an electric bed (not shown in the figure). The rotation of the worm 121 drives the rotation of the worm wheel 18, and the rotation of the lead screw 13 is driven by the worm wheel 18. Since the telescopic tube 15 is limited by the outer tube 14, the telescopic tube 15 will move linearly relative to the lead screw 13 during the rotation of the lead screw 13, so as to make the front part of the electric bed rise.

[0056] Please refer to Figures 8 to 11As shown, when the patient must be in a flat position during the process of first aid, such as electric shock, etc., the clutch wheel 32 and the positioning wheel 31 are separated by rotating the pulling assembly 34. By using the weight of the patient or the force applied by the medical staff to the front section of the electric bed, the telescopic tube 15 will cause the lead screw 13 to rotate quickly and retract into the outer tube 14 under the action of the aforementioned force, and the inner sleeve 53 will rotate with the centrifugal assembly 55 driven by the lead screw 13. When the centrifugal force of the centrifugal block 551 is less than the elastic force of the elastic element 555, the centrifugal block 551 will be limited in the second accommodating portion 532 by the elastic element 555, so that the inner sleeve 53 can rotate freely inside the outer sleeve 51 (as shown in Figure 9 ).

[0057] When the centrifugal force of the centrifugal block 551 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 clamped by the protruding portion 531 and the blocking portion 512, so that the inner sleeve 53 and the outer sleeve 51 are connected and rotate together (as shown in Figure 11 ). By embedding each positioning strip 514 in each positioning groove 141, the rotation of the inner sleeve 53 is stopped by the outer sleeve 51 when the outer sleeve 51 remains stationary, so that the impact force of the telescopic tube 15 during rapid descent can be absorbed by the centrifugal safety device 50, thereby reducing the harm to the patient and improving the user's comfort.

[0058] In an embodiment, the centrifugal safety device 50 of the present application can be used in various fields such as shaving of turbine or breaking of motor shaft, which can prevent stall during operation and effectively play a safety protection mechanism.

[0059] As shown in Figure 12 and Figure 13 In addition to the features of the previous embodiment, the centrifugal safety device 50A of the present embodiment further comprises a deceleration spring 60 tightly bound around the outer circumference of the aforementioned outer sleeve 51, and the deceleration spring 60 has a positioning arm 61 extending outward, which is used to pass through and fix in the housing 11. When the centrifugal safety device 50A is installed in the electric cylinder 1, the inner sleeve 53 is sleeved on the lead screw 13, and the positioning plane 131 and the positioning plane 533 are in close contact (as shown in Figure 11As shown), the inner sleeve 53 is rotated by the lead screw 13. The centrifugal block 551 moves into the first receiving part 513 and is held by the protrusion 531 and the stop part 512. When the inner sleeve 53 and the outer sleeve 51 rotate together, the friction is formed between the inner circumferential surface of the deceleration spring 60 and the outer circumferential surface of the outer sleeve 51. The deceleration spring 60 then brakes or decelerates the outer sleeve 51.

[0060] Please see Figure 14 and Figure 15 As shown, the centrifugal safety device 50B of this embodiment differs from the aforementioned embodiments in that: a convex ring 515 extends outward from one end edge of the outer sleeve 51B; two radial grooves 535 are provided on each protrusion 531 of the inner sleeve 53B; a convex ring 536 also extends outward from one end edge of the inner sleeve 53B; and a positioning plane 533 is provided inside the inner sleeve 53B that fits against the positioning plane 131 of the aforementioned guide screw 13. Each centrifugal block 551B of the centrifugal assembly 55B also has two radial grooves 553. In this embodiment, the elastic element 555B is a C-shaped ring, and each elastic element 555B is respectively fastened to the aforementioned radial grooves 535 and 553. The deceleration spring 60 is tightly bound to the outer circumferential surface of the outer sleeve 51B and attached to the side of the convex ring 515.

[0061] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. An electric cylinder, characterized in that, include: A moving body includes an electric motor, a lead screw, an outer tube, and a telescopic tube. The lead screw is driven to rotate by the electric motor. The outer tube is sleeved on the outside of the telescopic tube. The telescopic tube and the lead screw are screwed together for transmission. A fast-release mechanism is fitted onto the lead screw; A centrifugal safety device, fitted onto the lead screw, the centrifugal safety device comprising: An outer sleeve has a cavity, in which a plurality of stops are provided, and a first receiving portion is formed between any two adjacent stops, and each stop is a stop block. An inner sleeve is disposed inside the outer sleeve, and a plurality of protrusions extend from the outer circumferential surface of the inner sleeve. A second receiving portion is formed between any two adjacent protrusions, and each protrusion is a raised strip; and A plurality of centrifuge assemblies, each centrifuge assembly including a centrifuge block and a plurality of elastic elements, the centrifuge block being movably disposed between the first accommodating portion and the second accommodating portion; A front cap and a rear cap respectively cover the inner sleeve and both ends of each centrifugal assembly and elastically clamp each elastic element; a plurality of flat surfaces are provided inside the front cap and the rear cap; and A deceleration spring tightly binds the outer sleeve, and the deceleration spring has a positioning arm. The actuating body also includes a housing, and the positioning arm is fixed to the housing. Each centrifuge block has a stepped cross-section, and the thickness of the two sides of the centrifuge block is less than the thickness of the middle section. A blind hole is provided at each of the two sides of the centrifuge block. The elastic element is a compression spring, with one end of each compression spring abutting against the flat surface and the other end housed in the blind hole. The lead screw drives the inner sleeve and each centrifugal component to rotate. When the centrifugal force of each centrifugal block is less than the elastic force of each elastic element, each centrifugal block will be restricted by each elastic element in each of the second receiving portions, thereby allowing the inner sleeve to rotate inside the outer sleeve. When the centrifugal force of each centrifugal block is greater than the elastic force of each elastic element, each centrifugal block will move into each of the first receiving portions and be clamped by each of the protrusions and each of the stops, thereby linking the inner sleeve and the outer sleeve.

2. The electric cylinder as described in claim 1, characterized in that, Each of the protrusions is provided with a slot, and the interior of the rear cap extends a strip that is respectively embedded in each of the slots.

3. The electric cylinder as described in claim 1, characterized in that, It also includes a gasket that fits onto the lead screw and forms on the side of the front cap.

4. A centrifugal safety device, characterized in that, include: An outer sleeve has a cavity, in which a plurality of stops are provided, and a first receiving portion is formed between any two adjacent stops, and each stop is a stop block. An inner sleeve is disposed inside the outer sleeve, and a plurality of protrusions extend from the outer circumferential surface of the inner sleeve. A second receiving portion is formed between any two adjacent protrusions, and each protrusion is a raised strip; and A plurality of centrifuge assemblies, each centrifuge assembly including a centrifuge block and a plurality of elastic elements, the centrifuge block being movably disposed between the first accommodating portion and the second accommodating portion; A front cap and a rear cap respectively cover the inner sleeve and the two ends of each centrifugal component and elastically clamp each elastic element. A plurality of flat surfaces are provided inside the front cap and the rear cap. A deceleration spring tightly binds the outer sleeve; Each centrifuge block has a stepped cross-section, and the thickness of the two sides of the centrifuge block is less than the thickness of the middle section. A blind hole is provided at each of the two sides of the centrifuge block. The elastic element is a compression spring, with one end of each compression spring abutting against the flat surface and the other end housed in the blind hole. 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 by the elastic element in the second accommodating part, thereby allowing 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 receiving part and be clamped by the protrusion and the stop, thereby causing the inner sleeve and the outer sleeve to move together.

5. The centrifugal safety device as described in claim 4, characterized in that, Each of the protrusions is provided with a slot, and the interior of the rear cap extends a strip that is respectively embedded in each of the slots.

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