Quick release linear actuator

Abstract

The invention discloses a quick-release linear actuator which comprises a lead screw, an actuating unit, a clutch and a release assembly, and the release assembly comprises a movable rod movably arranged in the radial direction of the lead screw; the transmission block is arranged in the axial direction of the lead screw in a sliding mode and connected with the clutch, and the transmission block moves in the axial direction to drive the clutch to act so as to keep or cut off power transmission between the actuating unit and the lead screw; the rotating seat can rotate around the movable rod within a preset angle range, and one end of the movable rod extends into the rotating seat; the release sliding block is installed in the rotating seat in a sliding mode and fixed in the circumferential direction relative to the rotating seat, the release sliding block is provided with a driving inclined face extending in the sliding direction of the release sliding block, the release sliding block is pulled to slide, and the driving inclined face is used for converting sliding of the release sliding block into radial driving force on the movable rod; the movable rod moves under radial driving force to push the transmission block to slide so as to drive the clutch to act to cut off power transmission between the actuating unit and the lead screw.

Claims

1. A quick-release linear actuator comprising: A lead screw and an actuating unit, wherein the lead screw is driven by the actuating unit to rotate forward and reverse; A clutch is used to maintain or cut off the power transmission between the actuating unit and the screw rod; A release assembly, which is used to drive the clutch to cut off the power transmission between the actuating unit and the lead screw to activate the release function of the linear actuator; Characterized in that the release component comprises: A movable rod, which is movably arranged along the radial direction of the screw rod; A transmission block is slidably arranged along the axial direction of the screw rod and connected to the clutch. The axial movement of the transmission block can drive the clutch to maintain or cut off the power transmission between the actuating unit and the screw rod; A rotating seat, which can rotate around the movable rod within a predetermined angle range, and one end of the movable rod extends into the rotating seat; A release slider is slidably installed in a rotating seat and is circumferentially fixed relative to the rotating seat. The release slider has a driving inclined surface extending along its sliding direction. The release slider is pulled and slides. The driving inclined surface is used to convert the sliding of the release slider into a radial driving force for the movable rod. The movable rod is moved by the radial driving force to push the transmission block to slide, so as to drive the clutch to operate and cut off the power transmission between the actuating unit and the screw rod.

2. The quick-release linear actuator of claim 1, wherein: The movable rod is provided with a first transmission bevel, and the transmission block is provided with a second transmission bevel. The first transmission bevel cooperates with the second transmission bevel to convert the radial driving force applied to the movable rod into an axial driving force applied to the transmission block.

3. The quick-release linear actuator of claim 2, wherein: When the movable rod is radially moved outward by the radial driving force, the first transmission inclined surface acts on the second transmission inclined surface to make the transmission block slide axially, thereby driving the clutch to cut off the power transmission between the actuating unit and the screw rod; Alternatively, when the movable rod moves radially inwardly by the radial driving force, the first transmission inclined surface acts on the second transmission inclined surface to make the transmission block slide axially, thereby driving the clutch to cut off the power transmission between the actuating unit and the screw rod.

4. The quick-release linear actuator of claim 1, wherein: The linear actuator further comprises a fixedly mounted guide seat, on which a slide groove extending along the axial direction of the screw rod is provided, and the transmission block is slidably matched with the slide groove.

5. The quick-release linear actuator of claim 1, wherein: The clutch comprises a clutch sleeve and a shift fork rotatably mounted outside the clutch sleeve, the shift fork being connected to a transmission block, and the transmission block slidingly drives the shift fork to drive the clutch sleeve to move along the axial direction of the screw rod, so that the clutch maintains or cuts off the power transmission between the actuating unit and the screw rod.

6. The quick-release linear actuator of claim 5, wherein: The shift fork includes a fork rod connected to the transmission block and two fork legs connected to the fork rod. An annular matching portion is provided on the outer peripheral side of the clutch sleeve. The fork legs are plugged into and matched with the matching portion and can rotate relatively. The transmission block slides axially to drive the entire shift fork to move axially, thereby driving the clutch sleeve to move axially.

7. The quick-release linear actuator of claim 5, wherein: The shift fork includes an active arm connected to the transmission block and two driven arms for shifting the clutch sleeve. The shift fork rotates relative to the actuating unit, the transmission block slides and drives the active arm to drive the shift fork to rotate, and the two driven arms rotate to drive the clutch sleeve to move axially.

8. The quick-release linear actuator of claim 1, wherein: The linear actuator further comprises an elastic reset member, which is used to drive the transmission block to drive the clutch to slide and reset after the traction on the release slide block is canceled, so that the clutch maintains the power transmission between the actuating unit and the screw rod.

9. The quick-release linear actuator of claim 1, wherein: The rotating seat can rotate 360 ​​degrees around the movable rod.

10. The quick-release linear actuator of claim 9, wherein: The linear actuator also includes a shell for accommodating a clutch and at least part of the actuating unit. The rotating seat is located outside the shell. The shell is provided with a through hole. One end of the movable rod passes through the through hole and extends into the rotating seat. The rotating seat is provided with a buckle that passes through the through hole. The buckle is engaged with a portion of the shell located around the through hole, and the buckle is rotatably matched with the shell.

11. The quick-release linear actuator of claim 1, wherein: A baffle is provided at one end of the movable rod located in the rotating seat, and the side of the baffle facing the driving inclined surface is a conical surface or an arc surface, and the driving inclined surface acts on the conical surface or the arc surface to apply a radial driving force to the movable rod.

12. The quick-release linear actuator of claim 1, wherein: The release assembly also includes a cable, one end of which extends into the rotating seat and is connected to the release slider, and the sliding of the release slider is caused by the traction of the cable.

13. The quick-release linear actuator of claim 1, wherein: The linear actuator also includes a telescopic assembly, which includes an outer tube, an inner tube and a nut threadedly connected to the screw rod, the nut and the inner tube form a circumferentially relatively fixed and axially relatively fixed connection, and the screw rod is also provided with a limit member located between the nut and the actuating unit, and the limit member is used to stop the nut.

14. The quick-release linear actuator of claim 13, wherein: The clutch is connected to the screw through a coupling, and the coupling includes a driving ratchet, a driven ratchet and a reset spring. The driving ratchet and the clutch rotate synchronously, and the driven ratchet and the screw form a connection that is relatively fixed in the circumferential direction and relatively movable in the axial direction. The reset spring acts on the driven ratchet to keep it in meshing with the driving ratchet. The ratchet teeth of the driving ratchet include a first side surface extending along the axial direction of the driving ratchet and a second side surface extending at a predetermined angle relative to the axial direction of the driving ratchet. When the actuating unit drives the screw to rotate forward so that the inner tube extends relative to the outer tube, the driving ratchet drives the driven ratchet through the first side surface to drive the screw to rotate forward.

15. The quick-release linear actuator of claim 14, wherein: The screw rod is sleeved with a support sleeve which rotates synchronously therewith, and the support sleeve includes a sleeve extending axially along the screw rod and a boss protruding on the outer peripheral side of the sleeve. The driven ratchet is slidably sleeved on the sleeve and remains relatively fixed with the sleeve in the circumferential direction, and the reset spring is arranged between the driven ratchet and the boss.

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