Quick release linear actuator

Abstract

The utility model discloses a quick release linear actuator, which comprises a screw rod, an actuating unit, a clutch and a release assembly, and is characterized in that the release assembly comprises a movable rod which is movably arranged along the radial direction of the screw rod; 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.

Description

[Technical Field]

[0001] This utility model relates to the field of linear actuator technology, and more particularly to a fast-release linear actuator. [Background Technology]

[0002] Linear actuators, also known as electric linear actuators, are widely used in furniture, medical equipment, solar power generation, emergency exits, and fire doors. Their main structure includes an actuation unit, a clutch, a lead screw, a telescopic assembly, and a release assembly. The clutch maintains or disconnects the power transmission between the actuation unit and the lead screw. The release assembly drives the clutch to disconnect the power transmission between the actuation unit and the lead screw, thus activating the release function of the linear actuator. The working principle of the linear actuator is as follows: Under normal conditions, the clutch maintains the power transmission between the actuation unit and the lead screw, allowing the actuation unit to drive the lead screw to rotate. The telescopic assembly is then driven by the lead screw to perform linear telescopic movement. When the motor malfunctions or a sudden power outage occurs, the lead screw cannot rotate, preventing the telescopic assembly from extending or retracting. In this case, by driving the clutch through the release assembly, the power transmission between the actuation unit and the lead screw is disconnected, activating the release function of the linear actuator. This allows the lead screw to rotate freely without being constrained by the actuation unit, enabling the telescopic assembly to retract and reset.

[0003] Existing release assemblies include a release slider connected to a clutch. The linear actuator also includes a housing for housing the clutch and at least part of the actuation unit. The release slider is slidably mounted on the housing along the axial direction of the lead screw. By pulling the release slider along the axial direction of the lead screw, an axial traction force along the lead screw axis can be applied to it, causing the release slider to slide axially and actuate the clutch, thereby cutting off the power transmission between the actuation unit and the lead screw. Therefore, the existing assembly method of the release slider results in a single force direction for the release slider, forcing the user to pull the release slider only along the axial direction of the lead screw. With limited axial operating space after the linear actuator is installed, the user cannot pull the release slider axially, thus preventing the activation of the quick-release function and affecting the user experience. To avoid affecting user operation, sufficient axial operating space needs to be provided for the installation of the linear actuator, resulting in high installation space requirements. [Utility Model Content]

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a linear actuator with fast release. By rotating the rotating base, the direction of the traction force applied to the release slider can be changed, so as to make the release component move and activate the release function of the linear actuator. This not only makes it convenient for users to operate, but also reduces the product's requirements for installation space.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] Fast-release linear actuators include:

[0007] A lead screw and an actuation unit, wherein the lead screw is driven by the actuation unit to rotate in both forward and reverse directions;

[0008] A clutch is used to maintain or disconnect the power transmission between the actuator and the lead screw.

[0009] Release assembly, which is used to drive the clutch to disconnect the power transmission between the actuator unit and the lead screw, thereby activating the release function of the linear actuator;

[0010] The release component includes:

[0011] The movable rod is arranged radially along the lead screw;

[0012] The transmission block is slidably disposed along the axial direction of the lead screw and connected to the clutch. The axial movement of the transmission block can drive the clutch to operate, thereby maintaining or cutting off the power transmission between the actuator and the lead screw.

[0013] A rotating seat that can rotate around a movable rod within a predetermined angle range, with one end of the movable rod extending into the rotating seat;

[0014] A release slider is slidably mounted in a rotating seat and circumferentially fixed relative to the rotating seat. The release slider has a driving ramp extending along its sliding direction. The release slider is pulled and slides. The driving ramp is used to convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod is moved by the radial driving force to push the transmission block to slide, thereby driving the clutch to actuate and cut off the power transmission between the actuating unit and the lead screw.

[0015] When the linear actuator of this invention needs to activate the rapid release function, since the release slider and the rotating seat are circumferentially fixed, they rotate synchronously. The rotating seat can rotate around the movable rod within a predetermined angle range. Therefore, when the release slider is pulled in one direction and is inoperable due to space constraints, the sliding direction of the release slider can be changed by driving the rotating seat to rotate a certain angle. This changes the angle between the sliding direction of the release slider and the axis of the lead screw, thereby changing the direction of the traction force applied to the release slider and avoiding the space-constrained direction. In other words, this application can change the traction direction of the release slider simply by rotating the rotating seat, avoiding the limitation of the traction direction of the release slider in the prior art to a single traction direction parallel to the axis of the lead screw. Furthermore, the larger the predetermined angle range, the larger the range of traction direction changes that can be achieved by rotating the rotating seat. This allows users to apply traction force to the release slider in multiple directions, not only facilitating user operation but also reducing the product's installation space requirements. After the release slider is pulled and slides, the driving inclined plane can convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod moves under the radial driving force and pushes the transmission block to slide, thereby driving the clutch to act and cutting off the power transmission between the actuator unit and the lead screw. In addition, since the transmission block is usually a rigid part, the movement of the movable rod to drive the sliding of the transmission block to drive the clutch to act can make the transmission block bear a larger axial driving force, which is more durable, suitable for high-frequency operation, and extends the service life of the product.

[0016] In the aforementioned rapid-release linear actuator, the movable rod is provided with a first transmission inclined surface, and the transmission block is provided with a second transmission inclined surface. The first and second transmission inclined surfaces cooperate to convert the radial driving force on the movable rod into an axial driving force on the transmission block. This design allows the radial movement generated by the movable rod under radial driving force to be smoothly converted into the axial sliding of the transmission block. The structure is simple, facilitates the machining and forming of the movable rod and the transmission block, and does not affect the rotation of the rotating seat.

[0017] In the aforementioned rapid-release linear actuator, when the movable rod is radially driven outward, the first transmission ramp acts on the second transmission ramp to cause the transmission block to slide axially, thereby driving the clutch to actuate and cut off the power transmission between the actuator unit and the lead screw; or, when the movable rod is radially driven inward, the first transmission ramp acts on the second transmission ramp to cause the transmission block to slide axially, thereby driving the clutch to actuate and cut off the power transmission between the actuator unit and the lead screw. This design allows for the activation and release function by changing the inclination direction of the first and second transmission ramps, enabling the movable rod to move radially inward or outward under radial driving force. During production, the design can be tailored to actual needs, increasing the diversity of product options.

[0018] In the aforementioned fast-release linear actuator, the linear actuator further includes a fixedly mounted guide seat, on which a groove extending along the axial direction of the lead screw is provided, and the transmission block slides in engagement with the groove. This design, by guiding the transmission block to slide through the groove, prevents the transmission block from deviating from the axial direction of the lead screw during sliding, thereby ensuring the accuracy of the transmission block's sliding direction.

[0019] In the aforementioned fast-release linear actuator, the clutch includes a clutch sleeve and a shift fork rotatably sleeved on the outside of the clutch sleeve. The shift fork is connected to a transmission block, and the transmission block slides to drive the shift fork to move the clutch sleeve along the axial direction of the lead screw, so as to keep the clutch engaged or disengage the power transmission between the actuator unit and the lead screw.

[0020] In the aforementioned fast-release linear actuator, the shift fork includes a fork rod connected to the transmission block and two fork legs connected to the fork rod. The outer periphery of the clutch sleeve is provided with an annular mating part. The fork legs are inserted into the mating part and can rotate relative to each other. The transmission block slides axially to drive the entire shift fork to move axially, thereby driving the clutch sleeve to move axially.

[0021] In the aforementioned fast-release linear actuator, the shift fork includes an active arm connected to the transmission block and two driven arms for actuating the clutch sleeve. The shift fork rotates relative to the actuation unit, and the transmission block slides to drive the active arm to rotate the shift fork. The two driven arms rotate to drive the clutch sleeve to move axially.

[0022] In the aforementioned fast-release linear actuator, the linear actuator also includes an elastic reset element. After the traction on the release slider is released, the elastic reset element drives the transmission block to slide and reset the clutch, thereby maintaining power transmission between the actuation unit and the lead screw. This design allows the transmission block to automatically reset the clutch under the action of the elastic reset element after the traction on the release slider is released, enabling power transmission between the actuation unit and the lead screw without manual reset. This improves the user experience, and the design is simple, easy to install and maintain, and reduces cost and complexity.

[0023] In the aforementioned rapid-release linear actuator, the rotating base can rotate 360° around the movable rod. This design allows for traction of the release slider in various directions within a 360° range, resulting in more traction directions for the release slider and making operation more convenient for the user.

[0024] In the aforementioned rapid-release linear actuator, the linear actuator further includes a housing for accommodating the clutch and at least part of the actuation unit. The rotating seat is located outside the housing, and the housing has a through hole. One end of the movable rod extends through the through hole into the rotating seat. The rotating seat has a latch that passes through the through hole, and the latch engages with a portion of the housing around the through hole, and the latch and housing are rotatably fitted together. This design achieves both the connection between the rotating seat and the housing via the latch and the rotatable engagement between the rotating seat and the housing, resulting in a simple structure and convenient assembly.

[0025] In the aforementioned rapid-release linear actuator, a baffle is provided at one end of the movable rod located within the rotating base. The side of the baffle facing the driving inclined surface is a conical or arc-shaped surface. The driving inclined surface acts on the conical or arc-shaped surface to apply a radial driving force to the movable rod. This design allows the release slider to rotate smoothly around the movable rod when the rotating base is rotated, preventing jamming.

[0026] In the aforementioned rapid-release linear actuator, the release assembly further includes a cable, one end of which extends into the rotating seat and connects to the release slider. The sliding of the release slider is induced by the traction of the cable. This design allows the user to pull the release slider by pulling the cable. Furthermore, the cable's flexibility allows the direction of the traction force applied by the user to the cable to deflect slightly relative to the sliding direction of the release slider, further facilitating user operation.

[0027] In the aforementioned fast-release linear actuator, the linear actuator further includes a telescopic assembly comprising an outer tube, an inner tube, and a nut threadedly connected to a lead screw. The nut and the inner tube form a connection that is circumferentially and axially fixed. The lead screw also has a limiting member located between the nut and the actuation unit, which is used to stop the nut. With this design, when the nut moves axially towards the actuation unit along the lead screw, the limiting member stops the nut, restricting its movement and buffering any impact, thereby preventing the nut from directly impacting the actuation unit and extending the service life of the actuation unit.

[0028] In the aforementioned rapid-release linear actuator, the clutch is connected to the lead screw via a coupling. The coupling includes a driving ratchet, a driven ratchet, and a return spring. The driving ratchet rotates synchronously with the clutch. The driven ratchet and the lead screw form a connection that is circumferentially fixed and axially movable. The return spring acts on the driven ratchet to keep it engaged with the driving ratchet. The ratchet teeth of the driving ratchet include a first side extending along the axial direction of the driving ratchet and a second side extending at a predetermined angle relative to the axial direction of the driving ratchet. When the actuation unit drives the lead 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 to drive the lead screw to rotate forward. With this design, when the actuator unit drives the lead screw to reverse, causing the inner tube of the linear actuator to retract and clamp an object or person, the movement of the nut slows down due to the interference of the foreign object. This means the reverse rotation of the lead screw and driven ratchet slows down. Meanwhile, the driving ratchet continues to reverse at high speed under the drive of the actuator unit. Therefore, the speed difference between the driving and driven ratchet forces the driving ratchet to overcome the friction between its second side and the driven ratchet, disengaging it from the driven ratchet. This disengagement stops power transmission, thus stopping the lead screw from reversing and preventing clamping. Subsequently, the actuator unit stops working, and the foreign object can be manually removed. When removing the object, pulling the inner tube outwards drives the nut, converting the linear motion of the nut into the forward rotation of the lead screw. The forward rotation of the lead screw drives the driven ratchet to rotate forward. Since the driving ratchet is in a stopped state at this time, the forward rotation of the driven ratchet forces it to overcome the friction with the second side and disengage from the driving ratchet. That is, the forward rotation of the driven ratchet is not hindered by the driving ratchet, and the inner tube can be pulled out normally. After the inner tube is pulled out to the end, it stops moving. At this time, the lead screw and the driven ratchet also stop rotating forward. Under the action of the return spring, the driven ratchet resets and maintains engagement with the driving ratchet to achieve self-locking, finally removing the foreign object.

[0029] In the aforementioned rapid-release linear actuator, a support sleeve is fitted onto the lead screw, rotating synchronously with it. The support sleeve includes a sleeve extending axially along the lead screw and a shoulder protruding from the outer periphery of the sleeve. The driven ratchet is slidably fitted onto the sleeve and circumferentially fixed relative to the sleeve. The return spring is located between the driven ratchet and the shoulder. This design provides a mounting position for the return spring and the driven ratchet through the support sleeve, facilitating their assembly. Furthermore, the sleeve guides the extension and retraction of the return spring and the sliding of the driven ratchet, preventing misalignment of the return spring during extension and retraction.

[0030] These features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings. [Attached Image Description]

[0031] The present invention will be further described below with reference to the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the linear actuator in Embodiment 1 of this utility model;

[0033] Figure 2 This is a top view of the linear actuator in Embodiment 1 of this utility model;

[0034] Figure 3 for Figure 2 Sectional view of AA;

[0035] Figure 4 for Figure 3 A magnified view of part of C;

[0036] Figure 5 for Figure 2 Sectional view of BB;

[0037] Figure 6 for Figure 5 A magnified view of part of D;

[0038] Figure 7 This is an exploded view of the linear actuator in Embodiment 1 of this utility model;

[0039] Figure 8 This is an exploded view of the linear actuator section of the present invention in Embodiment 1.

[0040] Figure 9 This is a schematic diagram of the assembly of the release component and the shift fork in Embodiment 1 of this utility model;

[0041] Figure 10 This is an assembly diagram of the linear actuator part of the structure in Embodiment 1 of this utility model;

[0042] Figure 11 This is a cross-sectional view of the linear actuator after its activation and release function in Embodiment 1 of this utility model. Figure 1 ;

[0043] Figure 12 This is a cross-sectional view of the linear actuator after its activation and release function in Embodiment 1 of this utility model. Figure 2 ;

[0044] Figure 13 This is a cross-sectional view of the release component structure in Embodiment 2 of this utility model.

[0045] Figure label:

[0046] 100, Lead screw; 200, Actuation unit; 210, Motor; 220, Worm gear; 230, Worm; 300, Clutch; 310, Clutch sleeve; 320, Shift fork; 321, Fork lever; 322, Fork foot; 400, Release assembly; 410, Movable rod; 411, Baffle; 412, Push block; 413, First transmission ramp; 420, Transmission block; 4201, Protrusion; 421, Second transmission ramp; 422, Limiting protrusion; 430, Rotary seat; 431, Base; 4311, Buckle; 432, Cover; 440, Release slider; 441, Drive ramp; 442, Clearance hole; 450, Cable; 500, Telescopic assembly; 510, Inner tube; 520, Outer tube; 530, Nut; 600, Housing; 610, Guide seat; 611, Side plate; 612, Connecting plate; 613, Slide groove; 620, Mounting plate; 621, Main body; 622, Extension plate; 700, Elastic reset component; 800, Coupling; 810, Driving ratchet; 811, First side; 812, Second side; 820, Driven ratchet; 821, Third side; 822, Fourth side; 830, Return spring; 900, Support sleeve; 910, Sleeve; 920, Shoulder; 1000, Limiting component.

Detailed Implementation Methods

[0047] This invention provides a fast-release linear actuator, comprising:

[0048] A lead screw and an actuation unit, wherein the lead screw is driven by the actuation unit to rotate in both forward and reverse directions;

[0049] A clutch is used to maintain or disconnect the power transmission between the actuator and the lead screw.

[0050] Release assembly, which is used to drive the clutch to disconnect the power transmission between the actuator unit and the lead screw, thereby activating the release function of the linear actuator;

[0051] The release component includes:

[0052] The movable rod is arranged radially along the lead screw;

[0053] The transmission block is slidably disposed along the axial direction of the lead screw and connected to the clutch. The axial movement of the transmission block can drive the clutch to operate, thereby maintaining or cutting off the power transmission between the actuator and the lead screw.

[0054] A rotating seat that can rotate around a movable rod within a predetermined angle range, with one end of the movable rod extending into the rotating seat;

[0055] A release slider is slidably mounted in a rotating seat and circumferentially fixed relative to the rotating seat. The release slider has a driving ramp extending along its sliding direction. The release slider is pulled and slides. The driving ramp is used to convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod is moved by the radial driving force to push the transmission block to slide, thereby driving the clutch to actuate and cut off the power transmission between the actuating unit and the lead screw.

[0056] When the linear actuator of this invention needs to activate the rapid release function, since the release slider and the rotating seat are circumferentially fixed, they rotate synchronously. The rotating seat can rotate around the movable rod within a predetermined angle range. Therefore, when the release slider is pulled in one direction and is inoperable due to space constraints, the sliding direction of the release slider can be changed by driving the rotating seat to rotate a certain angle. This changes the angle between the sliding direction of the release slider and the axis of the lead screw, thereby changing the direction of the traction force applied to the release slider and avoiding the space-constrained direction. In other words, this application can change the traction direction of the release slider simply by rotating the rotating seat, avoiding the limitation of the traction direction of the release slider in the prior art to a single traction direction parallel to the axis of the lead screw. Furthermore, the larger the predetermined angle range, the larger the range of traction direction changes that can be achieved by rotating the rotating seat. This allows users to apply traction force to the release slider in multiple directions, not only facilitating user operation but also reducing the product's installation space requirements. After the release slider is pulled and slides, the driving inclined plane can convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod moves under the radial driving force and pushes the transmission block to slide, thereby driving the clutch to act and cutting off the power transmission between the actuator unit and the lead screw. In addition, since the transmission block is usually a rigid part, the movement of the movable rod to drive the sliding of the transmission block to drive the clutch to act can make the transmission block bear a larger axial driving force, which is more durable, suitable for high-frequency operation, and extends the service life of the product.

[0057] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of this utility model. In addition, it should be understood that the terms "upper," "lower," "left," "right," "longitudinal," "lateral," "inner," "outer," "vertical," "horizontal," "top," and "bottom," etc., indicating orientation or positional relationship, are only based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They are not intended to indicate or imply that the device / component must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0058] Example 1

[0059] like Figures 1 to 12 As shown, the linear actuator in this embodiment includes a lead screw 100, an actuation unit 200, a clutch 300, a release assembly 400, and a telescopic assembly 500. The clutch 300 is used to maintain or disconnect the power transmission between the actuation unit 200 and the lead screw 100. When the clutch 300 is in the state of maintaining the power transmission between the actuation unit 200 and the lead screw 100, the lead screw 100 can be driven by the actuation unit 200 to rotate in both directions. The telescopic assembly 500 includes an inner tube 510. The outer tube 520 and the nut 530 are provided. The nut 530 is at least partially fixed inside the inner tube 510. In this embodiment, the nut 530 extends into the inner tube 510 and is threadedly connected to the inner tube 510 so that the nut 530 is circumferentially fixed and axially fixed relative to the inner tube 510. The nut 530 is threadedly connected to the lead screw 100. Thus, the rotation of the lead screw 100 can drive the inner tube 510 to move outward relative to the outer tube 520 or retract into the outer tube 520, so that the telescopic component 500 can perform linear telescopic movement.

[0060] In this embodiment, the release assembly 400 is used to drive the clutch 300 to actuate, thereby cutting off the power transmission between the actuator unit 200 and the lead screw 100 and activating the release function of the linear actuator. It includes a movable rod 410, a transmission block 420, a rotating seat 430, and a release slider 440. The movable rod 410 is radially movable along the lead screw 100; the transmission block 420 is axially slidable along the lead screw 100 and connected to the clutch 300; axial movement of the transmission block 420 can drive the clutch 300 to actuate, thereby maintaining or cutting off the power transmission between the actuator unit 200 and the lead screw 100; the rotating seat 430 can rotate around the axis of the movable rod 410. Rotating within a predetermined angle range, one end of the movable rod 410 extends into the rotating seat 430; the release slider 440 is slidably mounted in the rotating seat 430 and remains circumferentially fixed relative to the rotating seat 430. The release slider 440 has a driving ramp 441 extending along its sliding direction. The release slider 440 is pulled and slides. The driving ramp 441 is used to convert the sliding of the release slider 440 into a radial driving force on the movable rod 410. The movable rod 410 is moved by the radial driving force and pushes the transmission block 420 to slide along the axial direction of the lead screw, so as to drive the clutch 300 to act and cut off the power transmission between the actuation unit 200 and the lead screw 100.

[0061] In this embodiment, when the linear actuator needs to activate the rapid release function, since the release slider 440 and the rotating seat 430 are circumferentially fixed, the release slider 440 and the rotating seat 430 rotate synchronously. The rotating seat 430 can rotate around the movable rod 410 within a predetermined angle range. Therefore, when the release slider 440 is pulled to slide in one direction and is unable to operate due to space limitations, the sliding direction of the release slider 440 can be changed by driving the rotating seat 430 to rotate a certain angle. That is, the angle between the sliding direction of the release slider 440 and the axis of the lead screw 100 can be changed, thereby changing the direction of the traction force applied to the release slider 440 and achieving the purpose of avoiding the space-limited direction. In this embodiment, the traction direction of the release slider 440 can be changed by rotating the rotating seat 430, which avoids the limitation of the traction direction of the release slider to a single traction direction parallel to the screw axis in the prior art. Moreover, the larger the predetermined angle range, the larger the range of traction direction of the release slider 440 that can be changed by rotating the rotating seat 430. This makes it convenient for users to apply traction force to the release slider 440 in multiple directions, which not only facilitates user operation but also reduces the product's requirements for installation space. After the release slider 440 is pulled and slides, the driving inclined surface 441 can convert the sliding of the release slider 440 into a radial driving force on the movable rod 410. The movable rod 410 moves under the radial driving force and pushes the transmission block 420 to slide, thereby driving the clutch 300 to act and cut off the power transmission between the actuation unit 200 and the lead screw 100. In addition, since the transmission block 420 is usually a rigid part, the movement of the movable rod 410 to drive the sliding of the transmission block 420 to drive the clutch 300 to act can make the transmission block 420 bear a larger axial driving force, which is more durable, suitable for high-frequency operation, and extends the service life of the product.

[0062] Specifically, in this embodiment, the actuation unit 200 includes a motor 210, a worm gear 220, and a worm 230. The worm 230 is connected to the output shaft of the motor 210 and maintains synchronous rotation. The worm gear 220 is rotatably sleeved on the outside of the lead screw 100 and meshes with the worm 230. The clutch 300 includes a clutch sleeve 310 and a shift fork 320 rotatably sleeved on the outside of the clutch sleeve 310. The clutch sleeve 310 is sleeved on the outside of the lead screw 100 and is drively connected to the lead screw 100 to maintain synchronous rotation. The clutch sleeve 310 can move along the axial direction of the lead screw 100. The axial end face of the clutch sleeve 310... One of the axial end faces of the worm gear 220 is provided with a transmission protrusion extending along the screw axial direction, and the other is provided with a transmission groove that engages with the transmission protrusion. The shift fork 320 is connected to the transmission block 420. The transmission block 420 slides along the screw axial direction to drive the shift fork 320 to move the clutch sleeve 310 along the screw axial direction, so that the transmission protrusion is inserted into the transmission groove to keep the clutch 300 maintaining the power transmission between the actuation unit 200 and the screw 100, or to disengage the transmission protrusion from the transmission groove to cut off the power transmission between the actuation unit 200 and the screw 100.

[0063] In this embodiment, the shift fork 320 includes a fork 321 extending radially along the lead screw and two fork legs 322 connected to and separated from one end of the fork 321. The outer periphery of the clutch sleeve 310 is provided with an annular mating part. The fork legs 322 are inserted into the mating part and can rotate relative to it. In this embodiment, the mating part is a groove. At this time, the fork legs 322 are inserted into the groove and can rotate relative to the groove to avoid interfering with the rotation of the clutch sleeve 310. In addition, the insertion and mating of the fork legs 322 with the mating part can make the fork legs 322 move along the lead screw axis and drive the clutch sleeve 310 to move synchronously axially. Thus, when the transmission block 420 slides along the lead screw axis, the entire shift fork 320 can be driven to move axially, thereby driving the clutch sleeve 310 to move along the lead screw axis, so that the clutch 300 can be activated to maintain or cut off the power transmission between the actuation unit 200 and the lead screw 100.

[0064] It is understood that in other embodiments of this utility model, the mating part can also be a rib. In this case, the fork foot is provided with an arc-shaped slot that mates with the rib. The fork foot can rotate relative to the rib and can also drive the clutch sleeve to move along the screw axis by moving the rib.

[0065] The linear actuator in this embodiment also includes a housing 600, a clutch 300, and at least a portion of the actuation unit 200 housed within the housing 600. A rotating seat 430 is located outside the housing 600. The rotating seat 430 includes a base 431 and a cover 432 that fits onto the base 431. The base 431 and the cover 432 cooperate to form a mounting cavity extending radially along the movable rod 410. The release slider 440 is slidably mounted within the mounting cavity. In this way, the release slider 440 can be slidably mounted radially along the movable rod 410 within the rotating seat 430, while ensuring that the release slider 440 and the rotating seat 430 are circumferentially fixed, so as to achieve synchronous rotation of the release slider 440 and the rotating seat 430. The housing 600 is provided with a through hole. One end of the movable rod 410 is located inside the housing 600 and cooperates with the transmission block 420. The other end extends radially along the lead screw and passes through the through hole into the rotating seat 430. A baffle 411 is connected to the end of the movable rod 410 located inside the rotating seat 430. In this embodiment, the release slider 440 is provided with a clearance hole 442 extending radially along the movable rod. The diameter of the clearance hole 442 is larger than the outer diameter of the movable rod 410 and smaller than the outer diameter of the baffle 411. The release slider 440 is provided with the aforementioned driving inclined surface 441 on both sides of the clearance hole 442. The driving inclined surface 441 gradually slopes downward toward the movable rod 410. The lowest point of the driving inclined surface 441 is lower than the baffle 411. With this design, when a traction force is applied to the release slider 440 so that the high point of its driving inclined surface 441 gradually approaches the baffle 411, the movable rod 410 can be moved radially outward by the driving inclined surface 441 acting on the baffle 411. After the rotating seat 430 rotates, it can still be ensured that when the release slider 440 is pulled, the movable rod 410 can be driven to move radially outward by the driving inclined surface 441, thereby realizing multi-directional traction of the release slider 440.

[0066] Preferably, the side of the baffle 411 facing the driving inclined surface 441 is a conical surface arranged around the axis of the movable rod 410, with the outer radial direction of the conical surface gradually increasing. The driving inclined surface 441 acts on the conical surface to apply a radial driving force to the movable rod 410. With this design, when the rotating seat 430 is rotated, the release slider 440 can rotate smoothly around the movable rod 410, avoiding jamming.

[0067] It is understood that in other embodiments of this utility model, the side of the baffle facing the driving inclined surface may also be an arc surface.

[0068] In this embodiment, the movable rod 410 is located inside the housing 600, and one end is fixed with a push block 412 to facilitate the installation of a push block 412. Figure 4 and Figure 6Taking the direction shown as an example, the clutch sleeve 310 is located to the left of the worm gear 220. A first transmission inclined surface 413 is provided on the left side of the push block 412. The first transmission inclined surface 413 gradually moves away from the worm gear 220 towards the direction closer to the lead screw axis, that is, the first transmission inclined surface 413 gradually tilts to the left towards the direction closer to the lead screw axis. The transmission block 420 is located on the side of the push block 412 away from the worm gear 220. A second transmission inclined surface 421 is provided on the right side of the transmission block 420. The second transmission inclined surface 421 and the first... The transmission ramp 413 is matched, so that the radial driving force on the movable rod 410 can be converted into an axial driving force on the transmission block 420 through the cooperation of the first transmission ramp 413 and the second transmission ramp 421. That is, when the release slider 440 is pulled to move the movable rod 410 radially outward, the transmission block 420 can be driven to move axially to the left through the cooperation of the first transmission ramp 413 and the second transmission ramp 421, so as to drive the clutch sleeve 310 to move to the left and disengage from the worm gear 220 (e.g. Figure 11 and 12 As shown in the figure, the structure is simple, which facilitates the processing and forming of the movable rod 410 and the transmission block 420, and does not affect the rotation of the rotating seat 430.

[0069] To prevent the transmission block 420 from shifting during sliding, a guide seat 610 is fixed inside the housing 600 in this embodiment. The guide seat 610 includes two side plates 611 and a connecting plate 612. The two side plates 611 extend along the axial direction of the lead screw 100 and are located on both sides of the movable rod 410 and the transmission block 420. The connecting plate 612 is connected to the right end of the two side plates 611. The side plates 611 are provided with a sliding groove 613 extending along the axial direction of the lead screw 100. The two sides of the transmission block 420 are provided with protrusions 4201. The protrusions 4201 are inserted into the sliding grooves 613 and slide in cooperation with the sliding grooves 613. In this way, the guide seat 610 can guide the radial movement of the movable rod 410 and guide the sliding of the transmission block 420 along the axial direction of the lead screw, and also support the transmission block 420. Preferably, there are two push blocks 412, the fork 321 is located between the two push blocks 412, and two second transmission ramps 421 are provided on both sides of the fork 321 and cooperate with the first transmission ramps 413 of the two push blocks 412 respectively, so that the fork 321 guides the radial movement of the movable rod 410.

[0070] To ensure that the first transmission inclined surface 413 and the second transmission inclined surface 421 always maintain a fit, in this embodiment, one end of the transmission block 420 is provided with two spaced-apart limiting protrusions 422. The limiting protrusions 422 are connected to the end of the second transmission inclined surface 421 near the lead screw axis. The limiting protrusions 422 are located below the push block 412 to limit the push block 412 when the movable rod 410 moves radially inward, thereby ensuring that the first transmission inclined surface 413 and the second transmission inclined surface 421 always fit.

[0071] In addition, such as Figure 4 and Figure 6 As shown, the linear actuator in this embodiment also includes an elastic reset member 700, which is a compression spring. A mounting plate 620 is also fixed inside the housing 600 by screws. The mounting plate 620 includes a main body 621 located between the guide seat 610 and the housing 600, and an extension plate 622 extending downward from the left end of the main body 621. The guide seat 610 is fixed to the mounting plate 620 by screws. The movable rod 410 passes through the main body 621. The extension plate 622 has a first positioning protrusion protruding to the right, and the left side of the transmission block 420 has a second positioning protrusion protruding to the left. The two ends of the elastic reset member 700 are respectively sleeved on the first positioning protrusion and the second positioning protrusion, and the elastic reset member 700 is clamped between the transmission block 420 and the housing 600. Between the extension plates 622, in this way, after the release slider 440 causes the movable rod 410 to move radially outward, driving the transmission block 420 to move to the left, the elastic reset member 700 is compressed and stores energy. After the traction on the release slider 440 is released, the elastic reset member 700 releases energy to drive the transmission block 420 to move to the right, thereby causing the clutch 300 to slide and reset, so that the clutch 300 maintains the power transmission between the actuation unit 200 and the lead screw 100. That is, after the traction on the release slider 440 is released, the transmission block 420 can drive the clutch 300 to automatically reset under the action of the elastic reset member 700, without the need for manual reset. This improves the user experience, and the design is simple, easy to install and maintain, and reduces costs and complexity.

[0072] To further facilitate user operation, the rotating seat 430 in this embodiment can rotate 360° around the movable rod 410, that is, the rotating seat 430 can rotate 360° around the axis of the movable rod 410. This design allows the release slider 440 to be pulled in various directions within a 360° range, resulting in more pulling directions for the release slider 440 and making the user's operation more convenient.

[0073] To enable the rotating base 430 to be assembled with the housing 600 and to rotate 360° relative to the housing 600, in this embodiment, the base 431 is provided with a through hole and a buckle 4311. The buckle 4311 engages with the portion of the housing 600 around the through hole, and the buckle 4311 and the housing 600 are rotatably fitted together. This design, while connecting the rotating base 430 to the housing 600 via the buckle 4311, also achieves a rotatable fit between the rotating base 430 and the housing 600, resulting in a simple structure and convenient assembly.

[0074] It is understood that in other embodiments of this utility model, a bearing is provided between the rotating seat and the through hole, so that the rotating seat can also rotate 360° around the movable rod.

[0075] Preferably, the release assembly 400 also includes a flexible cable 450. One end of the cable 450 extends into the rotating seat 430 and is connected to the release slider 440. The other end of the cable 450 is located outside the rotating seat 430. By pulling the other end of the cable 450, the release slider 440 can be pulled. Since the cable 450 has a certain degree of flexibility and can be bent, the direction of the traction force applied by the user to the cable 450 can be deflected at a small angle relative to the sliding direction of the release slider 440, thereby further facilitating user operation. It is understood that in other embodiments of this utility model, the rotating seat can also rotate around the axis of the movable rod at 30°, 60°, 90°, 180°, 270°, 300°, etc. In this case, based on the bearing provided between the rotating seat and the through hole, an arc-shaped limiting groove is provided on one of the housing and the rotating seat, and a limiting rib is provided on the other to be inserted into the limiting groove and slide in the limiting groove. The rotation angle of the rotating seat can be limited by the cooperation of the limiting groove and the limiting rib. For example, when the central angle of the limiting groove is 30°, the rotating seat rotates around the movable rod within a range of 30°.

[0076] Secondly, such as Figure 4 , Figure 7 and Figure 10As shown, in this embodiment, the clutch 300 is connected to the lead screw 100 via a coupling 800. The coupling 800 includes a driving ratchet 810, a driven ratchet 820, and a return spring 830. The driving ratchet 810 is integrally formed with the clutch sleeve 310 to maintain synchronous rotation. The driven ratchet 820 and the lead screw 100 form a connection that is circumferentially fixed and axially movable. The return spring 830 acts on the driven ratchet 820 to keep it engaged with the driving ratchet 810. The ratchet teeth of the driving ratchet 810 include a first side surface 811 extending along the axial direction of the driving ratchet and a second side surface 812 extending at a predetermined angle relative to the axial direction of the driving ratchet, that is, the surface of the first side surface 811 is parallel to the driving ratchet. The wheel extends axially, and the surface of the second side 812 extends at an angle of approximately 70 degrees relative to the axial direction of the driving ratchet. The ratchet teeth of the driven ratchet 820 have a third side 821 adapted to the first side 811 and a fourth side 822 adapted to the second side 812. When the actuation unit 200 drives the screw 100 to rotate forward so that the inner tube 510 extends relative to the outer tube 520, the driving ratchet 810 drives the driven ratchet 820 to rotate forward through the first side 811, and the driven ratchet 820 drives the screw 100 to rotate forward synchronously. With this design, when the actuation unit 200 drives the screw 100 to rotate in reverse so that the inner tube 510 retracts and clamps an object or human body, the movement of the nut 530 slows down under the interference of the foreign object. That is, the reverse rotation of the lead screw 100 and the driven ratchet 820 slows down. At this time, the driving ratchet 810 continues to rotate at high speed under the drive of the actuation unit 200. Therefore, the speed difference between the driving ratchet 810 and the driven ratchet 820 will force the driving ratchet 810 to overcome the friction between its second side 812 and the fourth side 822 of the driven ratchet 820 and disengage from the driven ratchet 820. That is, the driving ratchet 810 and the driven ratchet 820 disengage to stop the power transmission, thereby stopping the reverse rotation of the lead screw 100 and achieving anti-pinch. Subsequently, the actuation unit 200 stops working. When the foreign object is removed manually, the inner tube 510 is pulled outward to drive the nut 530. The linear motion of the nut 530 is converted into the forward rotation of the lead screw 100. The forward rotation of lever 100 drives the driven ratchet 820 to rotate forward. Since the driving ratchet 810 is in a stopped state at this time, the forward rotation of the driven ratchet 820 will force it to overcome the friction between the fourth side 822 and the second side 812 and disengage from the driving ratchet 810. That is, the forward rotation of the driven ratchet 820 will not be hindered by the driving ratchet 810, and the inner tube 510 can be pulled out normally. After the inner tube 510 is pulled out to the position, it stops moving. At this time, the lead screw 100 and the driven ratchet 820 also stop rotating forward. Under the action of the return spring 830, the driven ratchet 820 resets and remains engaged with the driving ratchet 810 to achieve self-locking, and finally removes the foreign object. This is because the linear actuator has the function of manually lifting the inner tube to the position and stopping self-locking.

[0077] like Figure 4 and Figure 7As shown, in order to assemble the return spring 830, a support sleeve 900 is fitted onto the lead screw 100 in this embodiment. The support sleeve 900 is connected to the lead screw 100 through a non-circular fit to maintain synchronous rotation with the lead screw 100, such as a spline fit or a flat fit. The support sleeve 900 includes a sleeve 910 extending along the axial direction of the lead screw 100 and a shoulder 920 protruding on the outer periphery of the sleeve 910. The driven ratchet 820 is slidably fitted onto the sleeve 910, and the driven ratchet 820 and the sleeve 910 are kept circumferentially fixed through a non-circular fit. The return spring 830 is located between the driven ratchet 820 and the shoulder 920. This design allows the support sleeve 900 to provide mounting positions for the return spring 830 and the driven ratchet 820, facilitating their assembly. Furthermore, the sleeve 910 guides the extension and retraction of the return spring 830 and the sliding of the driven ratchet 820, preventing misalignment of the return spring 830 during extension and retraction and axial displacement of the driven ratchet 820 during sliding. This ensures that the driven ratchet 820 can smoothly return to its original position and engage with the driving ratchet 810. It should be noted that the diameter of the clutch sleeve 310 in this embodiment is larger than that of the sleeve 910. Thus, when the release function is activated and the clutch sleeve 310 moves to the right, the sleeve 910 guides the axial movement of the clutch sleeve 310.

[0078] Finally, in this embodiment, the lead screw 100 is also fitted with a limiting member 1000 located between the nut 530 and the actuation unit 200. The limiting member 1000 is a rigid member, axially fixed relative to the lead screw 100 and rotatably engaged with the lead screw 100. The limiting member 1000 is used to stop the nut 530. With this design, when the nut 530 moves along the axial direction of the lead screw 100 towards the actuation unit 200, the limiting member 1000 can stop the nut 530, thus limiting the movement of the nut 530 and buffering the impact of the nut 530, thereby preventing the nut 530 from directly impacting the actuation unit 200, thereby extending the service life of the actuation unit 200.

[0079] It is understood that in other embodiments of this utility model, in order to simplify the structure of the linear actuator, the coupling can be omitted. In this case, the clutch sleeve can be sleeved on the lead screw in a non-circular fit, such as a spline fit or a flat fit, so that the clutch sleeve and the lead screw maintain a connection that is circumferentially fixed and axially movable.

[0080] Example 2

[0081] like Figure 13As shown, compared with Embodiment 1, this embodiment differs in that when the movable rod 410 moves radially inward under radial driving force, the first transmission inclined surface 413 acts on the second transmission inclined surface 421 to make the transmission block 420 slide axially to the left, thereby driving the clutch 300 to actuate and cut off the power transmission between the actuation unit 200 and the lead screw 100. Specifically, the release slider 440 is provided with a relief groove, and the driving inclined surface 441 is provided on the bottom surface of the relief groove. The driving inclined surface 441 gradually tilts upward towards the movable rod. The driving inclined surface 441 is pressed onto the top surface of the baffle 411. The top surface of the baffle 411 is an upwardly convex arc surface. With this design, when a traction force is applied to the release slider 440 so that the low point of its driving inclined surface 441 gradually approaches the baffle 411, the movable rod 410 can be moved radially inward by the driving inclined surface 441 acting on the baffle 411. At this time, the first transmission inclined surface 413 is inclined to the left in a direction away from the screw axis, and the second transmission inclined surface 421 is adapted to the first transmission inclined surface 413. With this design, when the movable rod 410 moves radially inward, the transmission block 420 can also be driven to move axially to the left through the cooperation of the first transmission inclined surface 413 and the second transmission inclined surface 421, so as to drive the clutch sleeve 310 to move to the left and disengage from the worm gear 220.

[0082] Example 3

[0083] Compared with Embodiment 1, the difference in this embodiment is that when the clutch sleeve moves axially to cut off the power transmission between the actuating unit and the lead screw, the sliding direction is opposite to that in Embodiment 1. That is, the clutch sleeve moves to the right to cut off the power transmission between the actuating unit and the lead screw. Specifically, the installation method of the clutch sleeve in the prior art CN214367368U can be referred to. That is, the worm gear is connected to a synchronously rotating right connecting member, the right connecting member is rotatably sleeved on the lead screw, and the lead screw is also connected to a synchronously rotating left connecting member. The clutch sleeve is sleeved on the right connecting member, and the clutch sleeve and the right connecting member maintain a synchronously rotating and axially relative movement connection. A return spring is provided between the right side of the clutch sleeve and the worm gear. Under normal conditions, the clutch sleeve maintains a transmission connection with the left connecting sleeve under the action of the return spring, so that the power of the actuating unit 200 is transmitted to the lead screw through the right connecting member, the clutch sleeve, and the left connecting member. By driving the clutch to move to the right through the release component 400, the power transmission between the actuating unit 200 and the lead screw 100 can be cut off, thereby activating the release function.

[0084] In this embodiment, the push block is located on the right side of the movable rod, and the transmission block is located on the right side of the push block. The inclination direction of the first transmission inclined surface and the second transmission inclined surface can be set according to the movement direction of the movable rod after being subjected to radial driving force. For details, please refer to Embodiment 1. Based on Embodiment 1, those skilled in the art can easily deduce how the first transmission inclined surface and the second transmission inclined surface are set according to the movement direction of the movable rod after being subjected to radial driving force, which will not be described in detail here.

[0085] Example 4

[0086] Compared with embodiments one to three, the difference in this embodiment is that the shift fork includes an active arm connected to the transmission block and two driven arms for actuating the clutch sleeve. The shift fork rotates relative to the actuation unit, and the transmission block slides to drive the active arm to rotate the shift fork. The two driven arms rotate to drive the clutch sleeve to move axially. The shift fork can be configured as in the prior art CN214367368U, where the shift fork is hinged to the shift fork seat. In this embodiment, the transmission block can be designed as the actuating element in CN214367368U. Thus, by driving the transmission block to move to the left along the screw axis, the clutch sleeve can be driven to move to the right to cut off the power transmission between the actuation unit and the screw. Alternatively, by driving the transmission block to move to the right along the screw axis, the clutch sleeve can be driven to move to the left to maintain the power transmission between the actuation unit and the screw. This will not be described in detail here.

[0087] It is understood that in other embodiments of this utility model, when the reset spring is located on the side of the clutch sleeve away from the worm gear, the drive transmission block can also be driven to move to the right along the screw axis, thereby driving the clutch sleeve to move to the left to cut off the transmission connection between the clutch sleeve and the worm gear, and thus cutting off the power transmission between the actuation unit and the screw. The specific implementation scheme can be obtained by those skilled in the art by making simple changes based on Embodiment 4, and will not be described in detail here.

[0088] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A fast-release linear actuator, including: A lead screw and an actuation unit, wherein the lead screw is driven by the actuation unit to rotate in both forward and reverse directions; A clutch is used to maintain or disconnect the power transmission between the actuator and the lead screw. Release assembly, which is used to drive the clutch to disconnect the power transmission between the actuator unit and the lead screw, thereby activating the release function of the linear actuator; The release component is characterized in that it comprises: The movable rod is arranged radially along the lead screw; The transmission block is slidably disposed along the axial direction of the lead screw and connected to the clutch. The axial movement of the transmission block can drive the clutch to operate, thereby maintaining or cutting off the power transmission between the actuator and the lead screw. A rotating seat that can rotate around a movable rod within a predetermined angle range, with one end of the movable rod extending into the rotating seat; A release slider is slidably mounted in a rotating seat and circumferentially fixed relative to the rotating seat. The release slider has a driving ramp extending along its sliding direction. The release slider is pulled and slides. The driving ramp is used to convert the sliding of the release slider into a radial driving force on the movable rod. The movable rod is moved by the radial driving force to push the transmission block to slide, thereby driving the clutch to actuate and cut off the power transmission between the actuating unit and the lead screw.

2. The fast-release linear actuator as described in claim 1, characterized in that, The movable rod is provided with a first transmission inclined surface, and the transmission block is provided with a second transmission inclined surface. The first transmission inclined surface and the second transmission inclined surface cooperate to convert the radial driving force on the movable rod into an axial driving force on the transmission block.

3. The fast-release linear actuator as described in claim 2, characterized in that, When the movable rod is radially driven outward, 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 actuator and the lead screw. Alternatively, when the movable rod moves radially inward under 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 act and cut off the power transmission between the actuating unit and the lead screw.

4. The fast-release linear actuator as described in claim 1, characterized in that, The linear actuator also includes a fixedly installed guide seat, on which a sliding groove extends along the axial direction of the lead screw, and the transmission block slides in cooperation with the sliding groove.

5. The fast-release linear actuator as described in claim 1, characterized in that, The clutch includes a clutch sleeve and a shift fork rotatably sleeved on the outside of the clutch sleeve. The shift fork is connected to a transmission block. The transmission block slides to drive the shift fork to move the clutch sleeve along the axial direction of the lead screw, so as to keep the clutch engaged or disengage the power transmission between the actuation unit and the lead screw.

6. The fast-release linear actuator as described in claim 5, characterized in that, The shift fork includes a fork rod connected to the transmission block and two fork feet connected to the fork rod. The outer periphery of the clutch sleeve is provided with an annular mating part. The fork feet are inserted into the mating part and can rotate relative to each other. The transmission block slides axially to drive the entire shift fork to move axially, thereby driving the clutch sleeve to move axially.

7. The fast-release linear actuator as described in claim 5, characterized in that, 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 actuation unit. The transmission block slides to drive the active arm to rotate the shift fork, and the two driven arms rotate to drive the clutch sleeve to move axially.

8. The fast-release linear actuator as described in claim 1, characterized in that, The linear actuator also includes an elastic reset element, which, after the traction on the release slider is released, drives the transmission block to slide and reset the clutch, so that the clutch maintains the power transmission between the actuation unit and the lead screw.

9. The fast-release linear actuator as described in claim 1, characterized in that, The rotating base can rotate 360° around the movable rod.

10. The fast-release linear actuator as described in claim 9, characterized in that, The linear actuator further includes a housing for accommodating a clutch and at least part of the actuation unit. The rotary seat is located outside the housing. The housing has a through hole. One end of the movable rod extends through the through hole into the rotary seat. The rotary seat has a buckle that passes through the through hole. The buckle engages with a portion of the housing located around the through hole, and the buckle rotates with the housing.

11. The fast-release linear actuator as claimed in claim 1, characterized in that, The movable rod has a baffle plate at one end inside the rotating seat. The side of the baffle plate facing the driving inclined surface is a conical surface or an arc surface. The driving inclined surface acts on the conical surface or arc surface to apply a radial driving force to the movable rod.

12. The fast-release linear actuator as described in claim 1, characterized in that, The release assembly also includes a cable, one end of which extends into the rotating seat and is connected to the release slider, the sliding of which is caused by the traction of the cable.

13. The fast-release linear actuator as described in claim 1, characterized in that, The linear actuator also includes a telescopic assembly, which includes an outer tube, an inner tube, and a nut threadedly connected to the lead screw. The nut and the inner tube form a connection that is circumferentially and axially fixed. The lead screw is also provided with a limiting member located between the nut and the actuation unit, which is used to stop the nut.

14. The fast-release linear actuator as described in claim 13, characterized in that, The clutch is connected to the lead screw via a coupling. The coupling includes a driving ratchet, a driven ratchet, and a return spring. The driving ratchet rotates synchronously with the clutch. The driven ratchet and the lead screw form a connection that is circumferentially fixed and axially movable. The return spring acts on the driven ratchet to keep it engaged with the driving ratchet. The ratchet teeth of the driving ratchet include a first side extending along the axial direction of the driving ratchet and a second side extending at a predetermined angle relative to the axial direction of the driving ratchet. When the actuation unit drives the lead 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 to drive the lead screw to rotate forward.

15. The fast-release linear actuator as described in claim 14, characterized in that, The lead screw is fitted with a support sleeve that rotates synchronously with it. The support sleeve includes a sleeve extending along the axial direction of the lead screw and a shoulder protruding on the outer periphery of the sleeve. The driven ratchet is slidably fitted on the sleeve and is circumferentially fixed relative to the sleeve. The return spring is located between the driven ratchet and the shoulder.

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