An electric push rod with self-locking function

Abstract

The present invention relates to the technical field of electric push rods, and specifically provides an electric push rod with a self-locking function, comprising a shell, a sleeve assembly connected to the shell, a power assembly installed in the shell, an output end of the power assembly connected to a front end assembly, the front end assembly comprising: a telescopic tube, one end of which is connected to a transmission nut, and the other end extends out of the sleeve assembly and is provided with a connector; and also comprises a self-locking assembly arranged at the output end of the power assembly, when a driving motor has no output power and the front end assembly has a reset tendency, the front end assembly drives the self-locking assembly to self-lock and limit, preventing the front end assembly from resetting, and when the driving motor outputs power, the self-locking assembly automatically releases the self-locking state and completes normal transmission; the problems of complex self-locking structure, short service life, and only one-way self-locking in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric push rods, and in particular to an electric push rod with a self-locking function. Background Art

[0002] The self-locking electric linear actuator is a special electric linear actuator. It can be locked after stopping working and is not affected by external forces. It has the advantages of high safety, stability, and reliability. Therefore, it is widely used in some specific environments, such as smart homes, medical equipment, industrial automation, etc.

[0003] Chinese patent CN220985456U discloses a self-locking device, a motor and a linear actuator. The self-locking device includes a drive shaft and a self-locking mechanism, the self-locking mechanism includes a follower fixed on the drive shaft and rotating with the drive shaft, a friction member and a housing arranged outside the follower in sequence, the outer surface of the follower is irregular, and a protrusion is provided on its outer surface, the inner ring of the friction member has a tensioning portion and a groove portion for accommodating the protrusion, when the protrusion is located in the groove portion, there is no tensioning force between the follower and the friction member, when the protrusion is against the position of the tensioning portion, the outer periphery of the friction member is tightened to form an interference fit between the friction member and the housing, thereby forming a one-way self-locking, so that the drive shaft does not lose power when rotating forward, and the self-locking mechanism forms a one-way self-locking capability for the drive shaft when it is reversed or in a power-off state.

[0004] However, this technical solution uses the friction part and the housing to form an interference fit. During the transmission process, the friction part is easily worn out, resulting in a short service life. At the same time, it can only achieve one-way self-locking, and cannot achieve two-way self-locking. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies in the prior art and to provide an electric push rod with a self-locking function. By arranging a self-locking component at the output end of a power component, the electric push rod can be quickly self-locked by the self-locking component when the power component is not in motion, thereby preventing the electric push rod from automatically resetting under the action of an external force; and the problems of the prior art such as the complex self-locking structure, short service life, and only one-way self-locking can be solved.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An electric push rod with a self-locking function comprises a shell, a sleeve assembly connected to the shell, a power assembly is installed in the shell, the output end of the power assembly is connected to a front end assembly, the front end assembly comprises: a telescopic tube, the telescopic tube is a hollow tube structure, one end of the telescopic tube is connected to the transmission nut, and the other end extends out of the sleeve assembly and is provided with a connector; it is characterized in that it also includes a self-locking assembly arranged at the output end of the power assembly, when the driving motor has no output power and the front end assembly has a reset tendency, the front end assembly drives the self-locking assembly to self-lock and limit, preventing the front end assembly from resetting, and when the driving motor outputs power, the self-locking assembly automatically releases the self-locking state to complete normal transmission.

[0008] As an improvement, the power assembly includes: a driving motor, a reducer connected to the output end of the driving motor, a transmission screw connected to the output end of the reducer, a transmission nut arranged on the outside of the transmission screw, and a nut sleeve arranged on the outside of the transmission nut, and the nut sleeve is slidingly connected to the inner wall of the sleeve assembly.

[0009] As an improvement, the self-locking component comprises:

[0010] A fixing seat, one end of which is connected to the reducer, and the other end of which is provided with a regulating cavity for regulating the opening and closing of the self-locking component;

[0011] A connecting shaft, one end of which is connected to the output end of the reducer;

[0012] A locking pin, a plurality of locking pins are arranged at intervals in the regulating cavity;

[0013] A release sleeve, the release sleeve is rotatably arranged in the regulating cavity, the release sleeve is connected to the other end of the connecting shaft, and rotates synchronously with the connecting shaft; a plurality of "T"-shaped release shovels are arranged at intervals in the circumferential direction of the release sleeve, the locking pin is arranged between two adjacent release shovels, and the rotation of the release shovel drives the locking pin to move away from the inner wall of the fixing seat;

[0014] A locking sleeve is connected to the transmission screw and rotates synchronously with the transmission screw. The outer circumference of the locking sleeve is provided with a plurality of pushing parts for pushing the locking pin toward the inner wall of the fixing seat. The pushing parts are arranged one by one with the locking pin.

[0015] As an improvement, a group of pushing parts and two adjacent groups of release shovels enclose an activity space for the locking pin.

[0016] As an improvement, the driving motor rotates, driving the release sleeve to rotate, and the release shovel shovels the locking pin in contact with the inner wall of the fixed seat away from the fixed seat, and the electric push rod is normally transmitted;

[0017] When the electric push rod reaches the specified position, the drive motor stops working, and the front-end component connected to the transmission screw is subjected to force and transmitted to the transmission screw, so that the transmission screw has a tendency to rotate, and at the same time drives the locking sleeve to rotate. The push part on the locking sleeve presses the locking pin against the inner wall of the control cavity to jam it, preventing the locking sleeve from continuing to rotate.

[0018] As an improvement, the position where the top of the pushing portion contacts the locking pin is in an arc shape.

[0019] As an improvement, the self-locking assembly further comprises gaskets arranged on the sides of the release sleeve and the locking sleeve.

[0020] As an improvement, it further comprises a quick release assembly arranged between the telescopic tube and the connecting head, wherein the quick release assembly is used for manually and quickly changing the position of the telescopic tube.

[0021] As an improvement, the quick release assembly comprises:

[0022] A lower fixing sleeve connected to the telescopic tube;

[0023] A support shaft, the support shaft is rotatably arranged at one end of the lower fixed sleeve, and a limiting protrusion is arranged on the support shaft;

[0024] An upper fixing sleeve, the upper fixing sleeve being rotatably connected to the other end of the supporting shaft;

[0025] An intermediate sleeve, one end of which is fixedly connected to the lower fixed sleeve, and the other end of which is connected to the limiting protrusion, and a plurality of fifth guide portions are axially provided on the outer diameter surface of the intermediate sleeve and the outer diameter surface of the upper fixed sleeve;

[0026] A manual sliding sleeve is slidably arranged on the outer diameter surfaces of the lower fixed sleeve, the middle sleeve and the upper fixed sleeve, and its inner diameter surface is axially provided with a sixth guide portion adapted to the fifth guide portion.

[0027] As an improvement, the inner diameter surface of the manual sliding sleeve is provided with two groups of positioning grooves along the circumferential direction; the outer diameter surface of the lower fixed sleeve is provided with a plurality of elastic limiting parts for limiting the position of the manual sliding sleeve.

[0028] The beneficial effects of the present invention are:

[0029] (1) The present invention provides a self-locking component at the output end of the power component, so that when the power component is driven, the self-locking component and the front-end component are driven to transmit normally, thereby realizing the extension and retraction of the front-end component of the electric push rod. When the driving component stops driving and the front-end component has a reset tendency, the reset tendency is transmitted to the self-locking component, driving the self-locking component to self-lock and limit, thereby preventing the front-end component from resetting and realizing self-locking.

[0030] (2) The present invention drives the locking pin away from the inner wall of the fixed seat by rotating the release shovel, and at the same time, the release sleeve drives the locking sleeve to rotate, and the locking sleeve drives the transmission screw to rotate, thereby realizing the normal extension and retraction of the electric push rod; when the release sleeve does not rotate, the transmission screw rotates, driving the locking sleeve to rotate, and the pushing part presses the locking pin against the inner wall of the regulating cavity and prevents the locking sleeve from continuing to rotate, thereby realizing the self-locking of the transmission screw and preventing the electric push rod from automatically resetting when the drive motor is not in motion.

[0031] (3) The present invention uses a T-shaped release shovel to realize forward or reverse rotation of the driving motor, which can drive the locking pin away from the inner wall with strong control to achieve normal transmission.

[0032] (4) The present invention forms an activity space for the locking pin by using the pushing portion and two adjacent groups of release shovels, thereby limiting the position of the locking pin and improving the corresponding speed.

[0033] (5) The present invention realizes quick electric / manual switching when the position of the telescopic tube needs to be manually adjusted by setting a quick release component. At the same time, in an emergency, the manual operation mode can be immediately switched to improve the response speed.

[0034] (6) In the present invention, the locking pin does not contact the fixed seat during the transmission process, that is, there is no friction during the transmission process, which increases the service life of the locking pin. During the self-locking process, the pushing part quickly presses the locking pin against the inner wall of the fixed seat to achieve rapid self-locking, reduce the friction distance, and increase the service life.

[0035] In summary, the present invention has the advantages of self-locking function, fast self-locking response speed, fast manual / electric switching, long service life, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0038] Figure 3 For the present invention Figure 2 A partial enlarged schematic diagram in the middle;

[0039] Figure 4 A half-section schematic diagram of the self-locking assembly of the present invention;

[0040] Figure 5 This is a schematic diagram of the structure of the fixing seat of the present invention;

[0041] Figure 6 This is a schematic diagram of the release sleeve structure of the present invention;

[0042] Figure 7 This is a schematic diagram of the locking sleeve structure of the present invention;

[0043] Figure 8 This is a schematic diagram of the contact locking driving state of the present invention;

[0044] Fig. 9 This is a schematic diagram of the automatic locking state of the present invention;

[0045] Fig.10 For the present invention Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0046] Fig.11 It is an overall schematic diagram of the quick release assembly of the present invention;

[0047] Fig.12 This is a partial enlarged schematic diagram of point B in the present invention 2;

[0048] Fig.13 It is a cross-sectional schematic diagram of a quick release assembly of the present invention;

[0049] Fig.14 Schematic diagram of the switch assembly of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0052] Embodiment 1

[0053] like Figure 1-Figure 2As shown, the present embodiment provides an electric push rod with a self-locking function, comprising a housing 1, a sleeve assembly 2 connected to the housing 1, the sleeve assembly 2 is used to guide the front end assembly 4 to reciprocate along the axial direction of the sleeve assembly 2, a power assembly 3 is installed in the housing 1, and the output end of the power assembly 3 is connected to the front end assembly 4, the front end assembly 4 comprises: a telescopic tube 41, the telescopic tube 41 is a hollow tube structure, one end of which is connected to the driving nut 34, and the other end extends out of the sleeve assembly 2 and is provided with a connector 42; the connector 42 is used to connect to an object to be pushed; and also includes a self-locking assembly 5 arranged at the output end of the power assembly 3, when the driving motor 31 has no output power and the front end assembly 4 has a reset trend, the front end assembly 4 drives the self-locking assembly 5 to self-lock and limit, prevent the front end assembly 4 from being displaced, and prevent the front end assembly 4 from being quickly displaced by external force, causing a safety hazard, and when the driving motor 31 outputs power, the self-locking assembly 5 automatically releases the self-locking state to complete normal transmission.

[0054] Preferably, Figure 2 As shown, the sleeve assembly 2 includes a connecting sleeve 21, a sleeve 22 and a positioning member 23. The connecting sleeve 21 is connected to the housing 1. The two ends of the sleeve 22 are respectively connected to the connecting sleeve 21 and the positioning member 23. The inner wall of the positioning member 23 is provided with a guide ring 231. The guide ring 231 is slidably connected to the outer wall of the telescopic tube 41 to guide and position the telescopic tube 41. At the same time, the inner wall of the positioning member 23 is also provided with a plurality of sealing rings to seal the telescopic tube 41.

[0055] Preferably, Fig.14 As shown, it also includes a limiting component 7 arranged in the sleeve component 2 for limiting the position of the driving nut 34.

[0056] Furthermore, the limit assembly 7 includes a switch seat 71 and a switch plate 72 disposed on the switch seat 71, wherein the switch seat 71 is installed in the sleeve assembly 2, and the switch plate 72 is installed on the switch seat 71. Through the opening and closing of the switch plate, the feedback signal controls the start and stop of the power assembly, that is, when the driving nut is reset to the bottom, it touches the switch plate 72, so that the driving motor 31 stops working, that is, the telescopic tube of the electric push rod runs to the bottom.

[0057] As an improvement, Figure 2 As shown, the power assembly 3 includes: a driving motor 31, a reducer 32 connected to the output end of the driving motor 31, a transmission screw 33 connected to the output end of the reducer 32, a transmission nut 34 arranged on the outside of the transmission screw 33, and a nut sleeve 35 sleeved on the outside of the transmission nut 34, and the nut sleeve 35 is slidingly connected to the inner wall of the sleeve assembly 2.

[0058] It should be noted that the outer diameter surface of the transmission nut 34 is rotatably arranged in the nut sleeve 35, so that the transmission nut 34 can rotate along the circumferential direction of the nut sleeve 35, that is, a first guide portion is circumferentially provided on the inner wall of the nut sleeve 35, and a second guide portion is circumferentially provided on the outer wall of the transmission nut 34. The first guide portion cooperates with the second guide portion to realize the rotational movement of the transmission nut 34 along the circumferential direction of the nut sleeve. Of course, the first guide portion and the second guide portion can be guided and connected in a manner of matching a groove and a protrusion. Preferably, the first guide portion is a guide protrusion, and the second guide portion is a guide groove.

[0059] In addition, a third guide portion is provided on the inner wall of the sleeve 22 in the sleeve assembly 2, and the third guide portion is preferably a spline guide groove. The outer diameter surface of the nut sleeve 35 is provided with a fourth guide portion adapted to the third guide portion, and the fourth guide portion is preferably a guide protrusion adapted to the spline guide groove, so that the nut sleeve 35 drives the transmission nut 34 to reciprocate along the axial direction of the sleeve assembly 2; the front end assembly 4 is arranged on one side of the transmission nut 34, so that the front end assembly 4 and the transmission nut 34 move reciprocatingly along the sleeve assembly 2 synchronously.

[0060] Embodiment 2

[0061] like Figure 3-Figure 10 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The second embodiment differs from the first embodiment in that:

[0062] In this embodiment, Figure 3-Figure 7 As shown, the self-locking component 5 includes:

[0063] A fixing seat 51, one end of which is connected to the reducer 32, preferably by fasteners, and the other end of which is provided with a regulating cavity 511 for regulating the opening and closing of the self-locking component 5;

[0064] A connecting shaft 52, one end of which is connected to the output end of the reducer 32;

[0065] A locking pin 53, wherein a plurality of locking pins 53 are arranged at intervals in the regulating cavity 511;

[0066] A release sleeve 54 is rotatably disposed in the regulating cavity 511, and the release sleeve 54 is connected to the other end of the connecting shaft 52 and rotates synchronously with the connecting shaft 52; a plurality of "T"-shaped release shovels 541 are arranged at intervals in the circumference of the release sleeve 54, and the locking pin 53 is arranged between two adjacent release shovels 541, and the release shovel 541 rotates to drive the locking pin 53 away from the inner wall of the fixing seat 51; in addition, the "T"-shaped release shovel 541 can realize that the electric push rod can scoop up the locking pin 53 in both forward and reverse rotations, and can operate normally in both forward and reverse rotations; protrusions are arranged on both sides of the release shovel 541 for shoveling up the locking pin 53, and the protrusions are a structure with a relatively small thickness;

[0067] The locking sleeve 55 is connected to the transmission screw 33 and rotates synchronously with the transmission screw 33. The outer circumference of the locking sleeve 55 is provided with a plurality of pushing parts 551 for pushing the locking pin 53 toward the inner wall of the fixing seat 51. The pushing parts 551 are arranged one by one with the locking pin 53.

[0068] Preferably, one group of pushing parts 551 and two adjacent groups of releasing shovels 541 enclose an activity space for the locking pin 53, and the position of the locking pin 53 is limited by the activity space, so that when the electric push rod needs to self-lock, the locking sleeve 55 quickly contacts the locking pin 53 and gets stuck on the inner wall of the fixing seat 51, reducing the rotation angle of the locking sleeve 55, thereby reducing the distance that the electric push rod can be reset, and realizing the self-locking of the electric push rod with the minimum distance, avoiding long-distance movement that affects the normal use of the electric push rod. At the same time, when it is necessary to release the self-locking, the releasing shovel 541 can quickly shovel the locking pin 53 away from the fixing seat 51, so as to realize the normal output of the electric push rod.

[0069] Further, such as Figure 8 As shown, the driving motor 31 rotates, driving the release sleeve 54 to rotate, and the release shovel 541 shovels the locking pin 53 in contact with the inner wall of the fixing seat 51 away from the fixing seat 51, and the electric push rod is normally transmitted;

[0070] like Fig. 9 As shown, when the electric push rod reaches the specified position, the driving motor 31 stops working, and the front end component 4 connected to the transmission screw 33 transmits force to the transmission screw 33, so that the transmission screw 33 has a tendency to rotate, and at the same time drives the locking sleeve 55 to rotate. The pushing part 551 on the locking sleeve 55 presses the locking pin 53 against the inner wall of the regulating cavity 511 to clamp it, preventing the locking sleeve 55 from continuing to rotate, thereby realizing the self-locking of the electric push rod.

[0071] As an improvement, Figure 7 As shown, the position where the top of the pushing portion 551 contacts the locking pin 53 is in an arc shape, thereby improving the stability of the operation of the locking pin 53.

[0072] In addition, the bottom of the release shovel 541 abuts against the outer diameter surface of the locking sleeve 55 between the adjacent pushing parts 551, thereby improving the rotation stability of the locking sleeve 55 and the release sleeve and improving the transmission accuracy.

[0073] Furthermore, Fig.10 As shown, the self-locking component 5 also includes a gasket 56 arranged on the side of the release sleeve 54 and the locking sleeve 55; the gasket 56 closes the regulating cavity 511, and grease is provided in the regulating cavity 511 to lubricate the release sleeve 54 and the locking sleeve 55. At the same time, the position of the locking pin 53 is kept relatively constant and displacement will only occur under the action of a larger external force.

[0074] Embodiment 3

[0075] like Figure 11-13 As shown, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment. For the sake of simplicity, only the differences from the first embodiment are described below. The differences between the third embodiment and the first embodiment are as follows:

[0076] In this embodiment, the electric push rod also includes a quick release component 6 arranged between the telescopic tube 41 and the connecting head 42. The quick release component 6 is used to manually and quickly change the position of the telescopic tube 41. It should be noted that by dividing the telescopic tube 41 and the connecting head 42 into two separately rotating parts, the telescopic tube 41 is manually driven to reciprocate, thereby realizing the rapid adjustment of the position of the telescopic tube 41.

[0077] As an improvement, the quick release assembly 6 comprises:

[0078] A lower fixing sleeve 61, wherein the lower fixing sleeve 61 is connected to the telescopic tube 41;

[0079] A support shaft 62, the support shaft 62 is rotatably disposed at one end of the lower fixed sleeve 61, and a limiting protrusion 621 is provided on the support shaft 62;

[0080] An upper fixing sleeve 63, wherein the upper fixing sleeve 63 is rotatably connected to the other end of the support shaft 62;

[0081] An intermediate sleeve 64, one end of which is fixedly connected to the lower fixed sleeve 61, preferably by threaded connection and set screws, to achieve the fixation of the intermediate sleeve 64, and the other end is connected to the limiting protrusion 621. It should be noted that thrust bearings are provided on both sides of the limiting protrusion 621, and the support shaft 62 is rotatably limited on the lower fixed sleeve 61 through the intermediate sleeve 64; a plurality of fifth guide portions 641 are axially provided on the outer diameter surface of the intermediate sleeve 64 and the outer diameter surface of the upper fixed sleeve 63;

[0082] The manual sliding sleeve 65 is slidably arranged on the outer diameter surfaces of the lower fixed sleeve 61, the middle sleeve 64 and the upper fixed sleeve 63, and its inner diameter surface is axially provided with a sixth guide portion 651 adapted to the fifth guide portion 641; the fifth guide portion 641 and the sixth guide portion 651 preferably adopt a guide groove and a protrusion that cooperate with each other.

[0083] It should be noted that if Fig.12 As shown, when the sixth guide portion 651 contacts the fifth guide portions 641 of the intermediate sleeve 64 and the upper fixed sleeve 63 at the same time, the lower fixed sleeve 61 and the upper fixed sleeve 63 are connected to form an integral transmission structure.

[0084] like Fig.13 As shown, when the sixth guide portion 651 is separated from the fifth guide portion 641 of the upper fixing sleeve 63, the lower fixing sleeve 61 and the upper fixing sleeve 63 are relatively rotatable. When the upper fixing sleeve 63 is subjected to a leftward thrust, under the guidance of the transmission screw 33, the transmission nut 34 is self-rotated, driving the telescopic tube 41 to be retracted, thereby realizing manual resetting of the electric push rod. It should be noted that the premise for realizing manual resetting is that the transmission screw 33 is a non-self-locking screw, that is, the transmission nut 34 can be self-rotated by external force acting vertically on the transmission nut 34.

[0085] Furthermore, the inner diameter surface of the manual sleeve 65 is provided with two groups of positioning grooves 652 along the circumferential direction, and the two groups of positioning grooves 652 are located on one side of the sixth guide portion 651; the outer diameter surface of the lower fixed sleeve 61 is provided with a plurality of elastic limiting portions 611 for limiting the position of the manual sleeve 65, and the positioning grooves 652 are in a V-shaped structure, so that the elastic limiting portions 611 can be smoothly inserted into the positioning grooves 652 to achieve the positioning of the manual sleeve 65 during movement; the elastic limiting portions 611 preferably adopt a ball-matching spring method, the spring is installed in the lower fixed sleeve 61, the ball is arranged at the top of the spring, and the ball is positioned on the lower fixed sleeve by a limiting ring.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric push rod with a self-locking function, comprising a housing (1), a sleeve assembly (2) connected to the housing (1), a power assembly (3) installed in the housing (1), an output end of the power assembly (3) connected to a front end assembly (4), and the front end assembly (4) comprising: A telescopic tube (41), wherein the telescopic tube (41) is a hollow tube structure, one end of which extends out of the sleeve assembly (2) and is provided with a connector (42); The invention is characterized in that it further comprises a self-locking component (5) arranged at the output end of the power component (3); when the power component (3) has no output power and the front-end component (4) has a tendency to reset, the front-end component (4) drives the self-locking component (5) to self-lock and limit, thereby preventing the front-end component (4) from resetting; when the power component (3) outputs power, the self-locking component (5) automatically releases the self-locking state and completes normal transmission; The power assembly (3) comprises: a driving motor (31), a reducer (32) connected to the output end of the driving motor (31), a transmission screw (33) connected to the output end of the reducer (32), a transmission nut (34) arranged outside the transmission screw (33), and a nut sleeve (35) sleeved on the outside of the transmission nut (34), wherein the nut sleeve (35) is connected to the inner wall of the sleeve assembly (2) in a guiding sliding manner; the other end of the telescopic tube (41) is connected to the transmission nut (34); The self-locking component (5) comprises: A fixing seat (51), one end of the fixing seat (51) being connected to the reducer (32), and the other end of the fixing seat having a regulating chamber (511) for regulating the opening and closing of the self-locking component (5) disposed therein; A connecting shaft (52), one end of the connecting shaft (52) being connected to an output end of the reducer (32); A locking pin (53), wherein a plurality of locking pins (53) are arranged at intervals in the regulating cavity (511); A release sleeve (54), the release sleeve (54) being rotatably disposed in the regulating cavity (511), the release sleeve (54) being connected to the other end of the connecting shaft (52) and rotating synchronously with the connecting shaft (52); a plurality of "T"-shaped release shovels (541) being arranged at intervals in the circumferential direction of the release sleeve (54), the locking pin (53) being arranged between two adjacent release shovels (541), and the release shovel (541) rotating to drive the locking pin (53) away from the inner wall of the fixing seat (51); A locking sleeve (55), the locking sleeve (55) being connected to the transmission screw (33) and rotating synchronously with the transmission screw (33), the outer circumference of the locking sleeve (55) being provided with a plurality of pushing portions (551) for pushing the locking pin (53) toward the inner wall of the fixing seat (51), the pushing portions (551) being arranged in one-to-one correspondence with the locking pins (53).

2. The electric push rod with self-locking function according to claim 1, characterized in that: A group of pushing parts (551) and two adjacent groups of release shovels (541) enclose a movable space for the locking pin (53).

3. The electric push rod with self-locking function according to claim 1, characterized in that: The driving motor (31) rotates, driving the release sleeve (54) to rotate, and the release shovel (541) shovels the locking pin (53) in contact with the inner wall of the fixing seat (51) away from the fixing seat (51), and the electric push rod is normally driven; When the electric push rod reaches the specified position, the drive motor (31) stops working, and the front end assembly (4) connected to the transmission screw (33) is subjected to force and transmitted to the transmission screw (33), so that the transmission screw (33) has a tendency to rotate, and at the same time drives the locking sleeve (55) to rotate, and the pushing portion (551) on the locking sleeve (55) presses the locking pin (53) against the inner wall of the control cavity (511) to clamp it, thereby preventing the locking sleeve (55) from continuing to rotate.

4. The electric push rod with self-locking function according to claim 1, characterized in that: The position where the top of the pushing portion (551) contacts the locking pin (53) is in an arc shape.

5. The electric push rod with self-locking function according to claim 1, characterized in that: The self-locking assembly (5) further comprises a gasket (56) arranged on the sides of the release shaft sleeve (54) and the locking shaft sleeve (55).

6. An electric push rod with a self-locking function according to any one of claims 1 to 5, characterized in that: It also includes a quick release assembly (6) disposed between the telescopic tube (41) and the connector (42), wherein the quick release assembly (6) is used to quickly and manually change the position of the telescopic tube (41).

7. The electric push rod with self-locking function according to claim 6, characterized in that: The quick release assembly (6) comprises: A lower fixing sleeve (61), wherein the lower fixing sleeve (61) is connected to the telescopic tube (41); A support shaft (62), the support shaft (62) being rotatably disposed on one end of the lower fixed sleeve (61), and a limiting protrusion (621) being provided on the support shaft (62); an upper fixing sleeve (63), the upper fixing sleeve (63) being rotatably connected to the other end of the support shaft (62); an intermediate sleeve (64), one end of the intermediate sleeve (64) being fixedly connected to the lower fixed sleeve (61), and the other end of the intermediate sleeve (64) being connected to the limiting protrusion (621); and a plurality of fifth guide portions (641) being axially provided on the outer diameter surface of the intermediate sleeve (64) and the outer diameter surface of the upper fixed sleeve (63); A manual sliding sleeve (65) is slidably disposed on the outer diameter surfaces of the lower fixed sleeve (61), the middle sleeve (64) and the upper fixed sleeve (63), and the inner diameter surface of the manual sliding sleeve (65) is provided with a sixth guide portion (651) adapted to the fifth guide portion (641) along the axial direction.

8. The electric push rod with self-locking function according to claim 7, characterized in that: The inner diameter surface of the manual sliding sleeve (65) is provided with two groups of positioning grooves (652) along the circumferential direction; and the outer diameter surface of the lower fixed sleeve (61) is provided with a plurality of elastic limiting portions (611) for limiting the position of the manual sliding sleeve (65).

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