Linear actuator and medical bed with it

Abstract

This invention provides a linear actuator and a medical bed having the same. The linear actuator includes: a housing; a driving component disposed within the housing; a transmission assembly including a clutch, a main shaft, and a telescopic tube. The clutch is disposed within the housing, and the main shaft extends out of the housing. The clutch is movably sleeved on the main shaft or the driving component along the axis of the main shaft. The main shaft is drivenly connected to the telescopic tube to move the telescopic tube along the axial direction of the main shaft. An actuation assembly includes a oscillating component, which is oscillatingly disposed within the housing. The oscillating component has an oscillating end and a clutch end, located on opposite sides of the oscillation center of the oscillating component. The clutch has a driving state and a disengaged state, and the oscillating component can drive the clutch to switch between the driving state and the disengaged state. This solution addresses the problem of excessively large linear actuator dimensions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical beds, in particular to a linear driver and a medical bed with the same. BACKGROUND

[0002] The electric cylinder is a kind of linear driver, which is widely used in the fields of smart home and medical beds. In the field of medical beds, it is very common to use the linear driver to adjust the height and the angle of the medical bed. Especially when the patient needs emergency treatment, the linear driver can be quickly released to change the posture of the medical bed rapidly, so as to gain the most valuable golden rescue time.

[0003] In the related art, the electric cylinder has a motor, a clutch and a push rod. The clutch is used to realize the driving and separation of the motor and the push rod, so as to realize the quick release of the electric cylinder. Patent CN201008114Y discloses a quick release device of an electric cylinder, which includes a motor mechanism, a transmission mechanism, a clutch mechanism and a pulling mechanism. The motor mechanism and the transmission mechanism both have a shell. The pulling mechanism is arranged in the shell of the motor mechanism and passes through the shell of the transmission mechanism to realize the contact with the clutch.

[0004] However, the above-mentioned quick release device has two shells, which is complex in structure and is not conducive to the miniaturization of the device. SUMMARY

[0005] The present application provides a linear driver and a medical bed with the same, to solve the problem of the large size of the linear driver in the related art.

[0006] According to one aspect of the present application, a linear driver is provided, which includes a shell, a driving member arranged in the shell, a transmission assembly including a clutch member, a main shaft and an extension tube, the clutch member being arranged in the shell, the main shaft being arranged to pass out of the shell from the shell, the clutch member being movably sleeved on the main shaft or the driving member along the axis of the main shaft, the main shaft being drivingly connected with the extension tube to move the extension tube along the axial direction of the main shaft, and a pulling assembly including a swinging member, the swinging member being swingably arranged in the shell, the swinging member having a swinging end and a clutch end, the swinging end and the clutch end being located on two sides of the swinging center of the swinging member, wherein the clutch member has a driving state in which the output shaft of the driving member drives the main shaft to rotate, and a separation state in which the output shaft of the driving member is separated from the main shaft, and the swinging member is capable of driving the clutch member to switch between the driving state and the separation state.

[0007] Further, the pulling assembly further includes a pulling member capable of moving along a straight line, the pulling member being arranged to pass out of the shell from the shell, and the pulling member being drivingly connected with the swinging member to swing the swinging member.

[0008] Furthermore, the pulling member has multiple first teeth, and the oscillating member has multiple second teeth, with the multiple first teeth engaging with the multiple second teeth to drive the pulling member and the oscillating member together.

[0009] Furthermore, the swinging component includes a swing rod and a transmission rod connected to each other, with an included angle between the swing rod and the transmission rod. The swinging end is disposed on the transmission rod, and the pulling component is driven to connect with the transmission rod through the swinging end. The swing rod is swingably disposed on the housing, and the clutch end is disposed on the swing rod.

[0010] Furthermore, the linear actuator also includes a potentiometer capable of detecting spindle rotation parameters, the potentiometer being housed within the housing.

[0011] Furthermore, the potentiometer is a rotary potentiometer, with a first gear connected to the end of the potentiometer's rotating shaft, and a second gear sleeved on the main shaft, with the first gear and the second gear meshing with each other.

[0012] Furthermore, there is an included angle between the output shaft and the main shaft, and the transmission assembly also includes a meshing worm gear and a worm. The worm is connected to the output shaft, the worm gear is sleeved on the outer circumference of the main shaft, and the clutch is movably sleeved on the outer circumference of the worm gear. The worm gear can drive the main shaft to rotate through the clutch.

[0013] Furthermore, the worm gear includes a gear segment and a connecting cylinder segment connected together. The worm meshes with the gear segment. The outer wall of the connecting cylinder segment has multiple first strip-shaped protrusions, which are spaced apart circumferentially along the connecting cylinder segment. The clutch includes a clutch sleeve, which is fitted around the outer periphery of the connecting cylinder segment. The inner wall of the clutch sleeve has multiple grooves, and the multiple first strip-shaped protrusions are correspondingly embedded in the multiple grooves. The outer wall of the main shaft is provided with an annular protrusion located on the side of the connecting cylinder segment away from the gear segment. The outer wall of the annular protrusion is provided with multiple second strip-shaped protrusions. When the clutch is in the driving state, the multiple second strip-shaped protrusions are correspondingly embedded in the multiple grooves. The actuation assembly also includes a return spring. The two ends of the return spring abut against the worm gear and the clutch respectively. The return spring can keep the clutch in the driving state so that the main shaft drives the telescopic tube to move in a straight line. When the swinging component swings, the clutch end drives the clutch to move from the driving state to the disengaged state.

[0014] Furthermore, the inner wall of the housing is provided with a swing seat, and the swinging component is swingably mounted on the swing seat; and / or, the main shaft has an external thread, the telescopic tube has an internal thread, and the external thread and the internal thread are engaged.

[0015] According to another aspect of the present invention, a medical bed is provided, the medical bed comprising a bed body and a linear actuator, the linear actuator being disposed on the bed body, and the linear actuator being the linear actuator provided above.

[0016] The linear actuator of this invention includes a housing, a driving component, a transmission assembly, and a toggle assembly. A oscillating component drives a clutch to move from a disengaged state to a driven state. The output shaft of the driving component is connected to the main shaft and drives the main shaft to rotate. The main shaft is driven to move a telescopic tube along the axial direction of the main shaft, thereby enabling the medical bed to switch between multiple postures and achieve rapid release. When the oscillating component drives the clutch to move from the driven state to the disengaged state, the output shaft of the driving component separates from the main shaft. At this time, the main shaft cannot drive the telescopic tube to move, the position of the telescopic tube remains unchanged, and the medical bed remains in a specific posture. Compared with linear actuators in related technologies, this linear actuator only has a housing, resulting in a simpler structure and facilitating miniaturization of the device. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a linear driver provided according to an embodiment of the present invention is shown;

[0019] Figure 2 A schematic diagram of yet another structure of a linear driver provided according to an embodiment of the present invention is shown;

[0020] Figure 3 A cross-sectional view of a linear driver provided according to an embodiment of the present invention is shown;

[0021] Figure 4 It shows Figure 3 A magnified view of a section at point A in the middle;

[0022] Figure 5 An assembly diagram of the drive element and transmission assembly of a linear driver provided according to an embodiment of the present invention is shown;

[0023] Figure 6 A further schematic diagram of the structure of a linear driver provided according to an embodiment of the present invention is shown.

[0024] The above figures include the following reference numerals:

[0025] 10. Housing; 11. Swing seat; 12. Drive component;

[0026] 20. Transmission assembly; 21. Clutch; 211. Groove; 22. Main shaft; 221. Second gear; 23. Telescopic tube; 24. Worm gear; 241. Gear section; 242. Connecting cylinder section; 2421. First strip-shaped protrusion; 25. Worm;

[0027] 30. Actuating assembly; 31. Swinging component; 311. Second tooth; 312. Swing rod; 313. Transmission rod; 32. Pulling component; 321. First tooth; 33. Return spring;

[0028] 40. Potentiometer; 41. First gear. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] like Figures 1 to 6 As shown, this embodiment of the invention provides a linear actuator, which includes a housing 10, a driving member 12, a transmission assembly 20, and a toggle assembly 30. The driving member 12 is disposed within the housing 10. The transmission assembly 20 includes a clutch 21, a main shaft 22, and a telescopic tube 23. The clutch 21 is disposed within the housing 10, and the main shaft 22 extends out of the housing 10. The clutch 21 is movably sleeved on the main shaft 22 or the driving member 12 along the axis of the main shaft 22. The main shaft 22 is drivenly connected to the telescopic tube 23 to extend... The shrink tube 23 moves axially along the main shaft 22; the actuating assembly 30 includes a swing member 31, which is oscillatingly disposed within the housing 10. The swing member 31 has a swing end and a clutch end, which are located on both sides of the swing center of the swing member 31, respectively; wherein, the clutch member 21 has a driving state that drives the output shaft of the driving member 12 to drive the main shaft 22 to rotate and a disengagement state that separates the output shaft of the driving member 12 from the main shaft 22. The swing member 31 can drive the clutch member 21 to switch between the driving state and the disengagement state.

[0031] The linear actuator of this invention includes a housing 10, a driving component 12, a transmission assembly 20, and a toggle assembly 30. The oscillating component 31 drives the clutch 21 from a disengaged state to a driven state. The output shaft of the driving component 12 is connected to the main shaft 22 and drives the main shaft 22 to rotate. The main shaft 22 is driven to connect to the telescopic tube 23, causing the telescopic tube 23 to move along the axial direction of the main shaft 22. This allows the medical bed to switch between multiple postures and enables rapid release. When the oscillating component 31 drives the clutch 21 from a driven state to a disengaged state, the output shaft of the driving component 12 separates from the main shaft 22. At this time, the main shaft 22 cannot drive the telescopic tube 23 to move, and the position of the telescopic tube 23 remains unchanged, maintaining the medical bed in a specific posture. Compared to linear actuators in related technologies, this linear actuator only has a housing 10, resulting in a simpler structure and facilitating miniaturization of the device.

[0032] When the output shaft of the drive member 12 and the axis of the main shaft 22 coincide, the clutch member 21 can move in a straight line. When the output shaft of the drive member 12 and the axis of the main shaft 22 do not coincide, a transmission structure can be provided between the output shaft and the main shaft 22 to enable the clutch member 21 to move in a straight line.

[0033] Specifically, when the clutch 21 moves from the driving state to the clutch state, the clutch end of the swing member 31 contacts the clutch 21, causing the clutch 21 to move.

[0034] like Figures 1 to 4 As shown, the actuating assembly 30 also includes a pull member 32 capable of moving in a straight line. The pull member 32 extends from inside the housing 10 and out of the housing 10. The pull member 32 is driven to connect with the swing member 31, causing the swing member 31 to swing. Using the pull member 32 to connect with the swing member 31 to make the swing member 31 swing has the advantages of simple structure and easy installation.

[0035] It should be noted that the pulling member 32 can be configured to pull the swing member 31 in both directions, causing the swing member 31 to swing. Alternatively, it can be configured to pull the swing member 32 in one direction, and in conjunction with a reset member, such as a reset spring, to achieve the swinging of the swing member 31.

[0036] like Figure 4 and Figure 5 As shown, the pulling member 32 has multiple first teeth 321, and the swing member 31 has multiple second teeth 311. The multiple first teeth 321 and the multiple second teeth 311 mesh with each other to drive the pulling member 32 and the swing member 31. By using the meshing of multiple first teeth 321 and multiple second teeth 311, the driving structure is simple and easy to assemble.

[0037] In this configuration, since the swing end of the swing member 31 follows an arc-shaped motion trajectory, multiple second teeth 311 extend along the arc direction. Since the pulling member 32 moves in a straight line, multiple first teeth 321 are arranged in a straight line direction.

[0038] In this embodiment, the pulling member 32 includes a pull rope and a pulling block connected to the pull rope. The first tooth 321 is disposed on the pulling block, and the pulling block can be driven to move in a straight line by pulling the pull rope.

[0039] like Figure 2 and Figure 5 As shown, the swing member 31 includes a swing rod 312 and a transmission rod 313 connected together, with an included angle between the swing rod 312 and the transmission rod 313. The swing end is disposed on the transmission rod 313, and the pulling member 32 is drivenly connected to the transmission rod 313 through the swing end. The swing rod 312 is oscillatingly disposed on the housing 10, and the clutch end is disposed on the swing rod 312. The swing member 31 with the above structure has the advantages of simple structure and easy operation.

[0040] In this embodiment, the swing member 31 has a U-shaped structure, and both ends of the transmission rod 313 are connected to swing rods 312. Both swing rods 312 are hinged to the inner wall of the housing.

[0041] like Figure 5 As shown, the linear actuator also includes a potentiometer 40 capable of detecting the rotation parameters of the spindle 22. The potentiometer 40 is disposed inside the housing 10. The number of rotations of the spindle 22 can be detected by the potentiometer 40, thereby obtaining the displacement of the telescopic tube 23, and thus obtaining the extension or retraction amount of the linear actuator.

[0042] In related technologies, Hall effect sensors are often used to detect the displacement of the telescopic tube 23. However, Hall effect sensors can only identify the position of the telescopic tube 23 before power is cut off. If the transmission component 20 is manually adjusted, the Hall effect sensor cannot detect it and cannot identify the position of the telescopic tube 23 after adjustment, resulting in the loss of position signal. This leads to position signal loss during rapid release and position deviation during and after power failure.

[0043] Among them, potentiometer 40 is a rotary potentiometer. The end of the rotating shaft of potentiometer 40 is connected to a first gear 41, and a second gear 221 is sleeved on the main shaft 22. The first gear 41 and the second gear 221 mesh with each other. Using the above-mentioned potentiometer 40, the number of rotations of the main shaft 22 can be converted into the number of rotations of the rotating shaft of potentiometer 40 through the transmission ratio of the first gear 41 and the second gear 221. Combined with the change in the resistance value of potentiometer 40, the displacement of telescopic tube 23 can be obtained.

[0044] In this embodiment, due to the use of gear transmission, the displacement of the telescopic tube 23 is converted into the adjustable resistance value of the potentiometer 40. After power is restored, there is no need to rely on electronics for position recognition. The position information is reflected in the resistance value, which reflects the absolute value of the position. There is no problem of position deviation caused by signal loss.

[0045] Among them, the potentiometer 40 is located on one side of the main shaft 22, and the rotation axis of the first gear 41 is perpendicular to the rotation axis of the second gear 221.

[0046] like Figure 5 As shown, there is an included angle between the output shaft and the main shaft 22. The transmission assembly 20 also includes a meshing worm gear 24 and a worm 25. The worm 25 is connected to the output shaft, the worm gear 24 is sleeved on the outer circumference of the main shaft 22, and the clutch 21 is movably sleeved on the outer circumference of the worm gear 24. The worm gear 24 can drive the main shaft 22 to rotate through the clutch 21. With the above configuration, the power of the drive component 12 can be transmitted to the main shaft 22 through the worm 25, the worm gear 24, and the clutch 21.

[0047] In this embodiment, the drive member 12 is arranged vertically, the axis of the output shaft extends vertically, and consequently the axis of the worm 25 extends vertically, while the axis of the worm wheel 24 extends horizontally.

[0048] like Figure 4 and Figure 5 As shown, the worm gear 24 includes a gear section 241 and a connecting cylinder section 242 connected together. The worm 25 meshes with the gear section 241. The outer wall of the connecting cylinder section 242 has multiple first strip-shaped protrusions 2421, which are spaced apart circumferentially along the connecting cylinder section 242. The clutch element 21 includes a clutch sleeve, which is fitted around the outer periphery of the connecting cylinder section 242. The inner wall of the clutch sleeve has multiple grooves 211, and the multiple first strip-shaped protrusions 2421 are correspondingly embedded in the multiple grooves 211. With the above structure, power transmission can be achieved by the meshing of the gear section 241 and the worm 25, and the clutch sleeve can be used for disengagement and engagement with the connecting cylinder section 242. This structure has the advantages of simple structure and easy processing.

[0049] In this embodiment, the outer periphery of the clutch sleeve is provided with an annular flange, and the clutch end of the swing member 31 can abut against the annular flange to move the clutch sleeve.

[0050] like Figure 5As shown, an annular protrusion is provided on the outer wall of the main shaft 22. The annular protrusion is located on the side of the connecting cylinder section 242 away from the gear section 241. Multiple second strip-shaped protrusions are provided on the outer wall of the annular protrusion. When the clutch 21 is in the driving state, the multiple second strip-shaped protrusions are embedded in the multiple grooves 211 one by one. With the above structure, the connecting cylinder section 242 can transmit power to the main shaft 22 through the clutch sleeve by using the meshing of the second strip-shaped protrusions and the grooves 211.

[0051] In this embodiment, the actuating assembly 30 further includes a return spring 33. The two ends of the return spring 33 abut against the worm gear 24 and the clutch member 21, respectively. The return spring 33 keeps the clutch member 21 in the driving state, allowing the main shaft 22 to drive the telescopic tube 23 to move linearly. When the swing member 31 swings, the clutch end drives the clutch member 21 from the driving state to the disengaged state. The return spring 33 provides a spreading force between the worm gear 24 and the clutch member 21, ensuring that the clutch member 21 remains engaged with the main shaft 22.

[0052] Among them, a fastener is fixedly connected to the outer wall of the main shaft 22, and an annular protrusion is set on the fastener.

[0053] Of course, the return spring 33 can also be located in other positions, such as between the pull member 32 and the housing 10 to provide a return force for the pull member 32, or between the swing member 31 and the clutch member 21. The only requirement is that the clutch member 21 can be kept in the driving state.

[0054] like Figure 2 As shown, the inner wall of the housing 10 is provided with a swing seat 11, and the swing member 31 is swingably mounted on the swing seat 11, which facilitates the mounting of the swing member 31.

[0055] The main shaft 22 has an external thread, and the telescopic tube 23 has an internal thread; the external and internal threads mate with each other. This threaded connection method offers the advantage of a simple connection structure.

[0056] It should be noted that the internal thread can be directly set on the telescopic tube 23, or a nut with an internal thread can be fitted on the main shaft 22, and the telescopic tube 23 can be fitted on the nut.

[0057] In this embodiment, in order to ensure that the spindle 22 only rotates and does not move axially, a limiting member needs to be set in the axial direction of the spindle 22.

[0058] Another embodiment of the present invention provides a medical bed, which includes a bed frame and a linear actuator. The linear actuator is mounted on the bed frame and is the linear actuator described above. This medical bed utilizes a swing member 31 to drive a clutch member 21 from a disengaged state to an engaged state. The output shaft of the drive member 12 is connected to the main shaft 22 and drives the main shaft 22 to rotate. The main shaft 22 is driven to connect to a telescopic tube 23, causing the telescopic tube 23 to move along the axial direction of the main shaft 22. This allows the bed frame to switch between multiple postures and enables rapid release. When the swing member 31 drives the clutch member 21 from the engaged state to the disengaged state, the output shaft of the drive member 12 disengages from the main shaft 22. At this time, the main shaft 22 cannot drive the telescopic tube 23 to move, and the position of the telescopic tube 23 remains unchanged, maintaining the medical bed in a specific posture. Compared to linear actuators in related technologies, this linear actuator only requires a housing 10, resulting in a simpler structure and facilitating miniaturization of the device.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0060] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0061] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0062] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0063] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A linear drive, characterized by The linear driver comprises: a housing (10); a driving member (12) arranged in the housing (10); a transmission assembly (20) comprising a clutch member (21), a main shaft (22) and an extension tube (23), the clutch member (21) is arranged in the housing (10), the main shaft (22) is arranged to pass through the housing (10) and is arranged outside the housing (10), the clutch member (21) is movably sleeved on the main shaft (22) or the driving member (12) along the axis of the main shaft (22), the main shaft (22) is drivingly connected with the extension tube (23) to drive the extension tube (23) to move along the axis of the main shaft (22); a dial assembly (30) comprising a swing member (31), the swing member (31) is swingably arranged in the housing (10), the swing member (31) has a swing end and a clutch end, the swing end and the clutch end are respectively located on two sides of the swing center of the swing member (31); wherein the clutch member (21) has a driving state in which the output shaft of the driving member (12) drives the main shaft (22) to rotate and a separation state in which the output shaft of the driving member (12) is separated from the main shaft (22), the swing member (31) can drive the clutch member (21) to switch between the driving state and the separation state; the dial assembly (30) further comprises a pulling member (32) capable of moving along a straight line, the pulling member (32) passes through the housing (10) and is arranged outside the housing (10), the pulling member (32) is drivingly connected with the swing member (31) to drive the swing member (31) to swing; an inner wall of the housing (10) is provided with a swing seat (11), the swing member (31) is swingably arranged on the swing seat (11); the transmission assembly (20) further comprises a worm wheel (24) and a worm (25) in engagement, the worm (25) is connected with the output shaft, the worm wheel (24) is sleeved on the outer periphery of the main shaft (22), the clutch member (21) is movably sleeved on the outer periphery of the worm wheel (24), the worm wheel (24) can drive the main shaft (22) to rotate through the clutch member (21); the worm wheel (24) comprises a gear segment (241) and a connecting cylinder segment (242) connected with each other, the worm (25) is in engagement with the gear segment (241), an outer wall of the connecting cylinder segment (242) is provided with a plurality of first strip-shaped protrusions (2421), the plurality of first strip-shaped protrusions (2421) are arranged in the circumferential direction of the connecting cylinder segment (242) at intervals, the clutch member (21) comprises a clutch sleeve, the clutch sleeve is sleeved on the outer periphery of the connecting cylinder segment (242), an inner wall of the clutch sleeve is provided with a plurality of grooves (211), the plurality of first strip-shaped protrusions (2421) are one-to-one correspondingly embedded in the plurality of grooves (211). An annular protrusion is arranged on the outer wall of the main shaft (22), and is located on the side of the connecting cylinder segment (242) away from the gear segment (241). An outer wall of the annular protrusion is provided with a plurality of second strip-shaped protrusions. When the clutch (21) is in the driving state, the plurality of second strip-shaped protrusions are correspondingly embedded in the plurality of grooves (211).

2. Linear drive according to claim 1, characterized in that The pulling member (32) has a plurality of first teeth (321), and the swinging member (31) has a plurality of second teeth (311). The plurality of first teeth (321) and the plurality of second teeth (311) are engaged to drive the pulling member (32) and the swinging member (31) to be connected.

3. The linear drive of claim 1, wherein, The swinging member (31) comprises a swinging rod (312) and a transmission rod (313) connected to each other. An included angle is formed between the swinging rod (312) and the transmission rod (313). The swinging end is arranged on the transmission rod (313). The pulling member (32) is driven to be connected with the transmission rod (313) through the swinging end. The swinging rod (312) is swingably arranged on the housing (10). The clutch end is arranged on the swinging rod (312).

4. Linear drive according to any one of claims 1 to 3, characterized in that The linear driver further comprises a potentiometer (40) capable of detecting the rotation parameter of the main shaft (22). The potentiometer (40) is arranged in the housing (10).

5. The linear drive of claim 4, wherein, The potentiometer (40) is a rotary potentiometer. A first gear (41) is connected to the end of the rotation shaft of the potentiometer (40). A second gear (221) is arranged on the main shaft (22). The first gear (41) and the second gear (221) are engaged.

6. Linear drive according to any one of claims 1 to 3, characterized in that An included angle is formed between the output shaft and the main shaft (22).

7. The linear driver according to claim 6, wherein, The dialing assembly (30) further comprises a return spring (33). Two ends of the return spring (33) are respectively abutted with the worm wheel (24) and the clutch (21). The return spring (33) can keep the clutch (21) in the driving state, so that the main shaft (22) drives the telescopic tube (23) to move linearly. When the swinging member (31) swings, the clutch end drives the clutch (21) to move from the driving state to the separation state.

8. The linear driver according to any one of claims 1 to 3, wherein, The main shaft (22) has an external thread, and the telescopic tube (23) has an internal thread. The external thread and the internal thread are matched.

9. A medical bed, characterized by The medical sickbed comprises a bed body and a linear driver. The linear driver is arranged on the bed body and is the linear driver according to any one of claims 1 to 8.

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