CN218472954U - Electric drive push rod - Google Patents

Abstract

The utility model discloses an electric drive push rod, which comprises a mounting box, a drive component, a transmission component and a stand column component; the transmission assembly comprises a screw rod and a hollow screw rod which are sequentially arranged from inside to outside; the stand subassembly includes inner tube one, inner tube two, sleeve pipe one, sleeve pipe two and sleeve pipe three that set gradually from inside to outside, and inner tube one and sleeve pipe three fixed connection, fixedly connected with built-in nut one on the inner tube one, built-in nut screw-on connect soon on hollow lead screw, inner tube two and sleeve pipe two fixed connection, fixedly connected with built-in nut two on the inner tube two, built-in nut two screw-on sliding connection is on the lead screw, sleeve pipe one and mounting box fixed connection. The utility model discloses a fixed one section extending structure that forms of inner tube one and three cooperation installations of sleeve pipe, inner tube two and the fixed another section extending structure that forms of two cooperation installations of sleeve pipe, every telescopic joint all adopt two nest of tubes to close fixed formation, effectively ensure the firm reliability of overall structure for more stationarity and reliability of whole push rod lift adjustment process.

Description

Electric drive push rod

Technical Field

The utility model belongs to the technical field of the push rod, concretely relates to electric drive push rod.

Background

The electric push rod is an electric driving device which converts the rotary motion of a motor into the linear reciprocating motion of the push rod. The device can be used as an execution machine in various simple or complex process flows to realize remote control, centralized control or automatic control; the motion driving unit is widely used in the industries of household appliances, kitchen ware, medical appliances, automobiles and the like.

In the use process of the existing electric push rod, a plurality of sections of sleeve pipes are arranged in a falling sleeve mode, and the sleeve pipes are pushed to stretch and move through nuts matched with lead screws in a transmission mode. When the electric push rod operates, the electric push rod pushes out the sleeve with the top end generally being the minimum pipe diameter at the innermost side, the contact surface of the end part of the sleeve with the minimum pipe diameter is small, the contact is unstable, and the whole use stability is poor. The patent document discloses a utility model patent of an electric lifting child table (publication number: CN 208624828U), when the lifting column described in the technical scheme is used for lifting, the top end of the lifting column is an innermost sleeve with small pipe diameter, the sleeve with small pipe diameter is supported on a placing surface, the whole lifting column is in a structure with large top and small bottom after being extended, the whole structure stability is general, and the technical problems are also existed.

Disclosure of Invention

The utility model aims to provide an electric drive push rod's technical scheme to the not enough of prior art existence, design benefit, moreover, the steam generator is simple and reasonable in structure, therefore, the clothes hanger is strong in practicability, through the fixed one section extending structure that forms of inner tube one and three cooperation installations of sleeve pipe, the fixed another section extending structure that forms of two cooperation installations of inner tube two and sleeve pipe, every extending section all adopts the fixed formation of combination between two pipes, effectively ensure the firm reliability of overall structure, make more stationarity and reliability of whole push rod lift adjustment process, and the sleeve pipe telescopic support of big pipe diameter is placing the face in this scheme, improve overall structure stability and operational safety.

In order to solve the technical problem, the utility model discloses a following technical scheme:

an electric drive push rod comprises a mounting box, a drive assembly, a transmission assembly and a stand column assembly, wherein the drive assembly is arranged in the mounting box and is connected with the transmission assembly, and the drive assembly drives the transmission assembly to rotate so as to realize the lifting operation of the stand column assembly; the transmission assembly comprises a screw rod and a hollow screw rod which are sequentially arranged from inside to outside; the upright post assembly comprises an inner tube I, an inner tube II, a sleeve I, a sleeve II and a sleeve III which are sequentially arranged from inside to outside, the inner tube I is fixedly connected with the sleeve III, a built-in nut I is fixedly connected to the inner tube I, the built-in nut I is screwed on the hollow screw rod in a threaded manner, the inner tube II is fixedly connected with the sleeve II, a built-in nut II is fixedly connected to the inner tube II, the built-in nut II is connected to the screw rod in a threaded sliding manner, and the sleeve I is fixedly connected with the mounting box;

when the driving assembly drives the screw rod to rotate, the screw rod drives the hollow screw rod to synchronously rotate, the screw rod rotates to enable the built-in nut II to move along the screw rod, the built-in nut II drives the sleeve II to synchronously move through the inner pipe II, the hollow screw rod rotates to enable the built-in nut I to move along the hollow screw rod, and the built-in nut drives the sleeve III to synchronously move through the inner pipe.

Further, the one end of lead screw is connected with drive assembly, and the other end fix with screw of lead screw has the spline, and the spline slides the joint with the inner chamber wall of hollow lead screw, and drive assembly drives the lead screw and rotates, and the lead screw passes through the synchronous rotation that the spline drove hollow lead screw, and the slotted hole design on the embedded wall of spline cooperation hollow lead screw for the lead screw can drive hollow lead screw and rotate in step, realizes the flexible regulation of multisection.

Further, the tip of keeping away from drive assembly on the hollow lead screw is provided with the support ring seat, be provided with the arc arch on the lateral wall of support ring seat, the arc arch contacts with the inner chamber wall of inner tube one, design benefit is reasonable, the support ring seat supports spacingly in inner tube one, carry out the auxiliary stay reinforcement to the hollow lead screw, make overall structure more firm reliable, and through the bellied ingenious design of arc, can reduce area of contact between support ring seat and the inner tube inner wall, thereby reduce the frictional wear between support ring seat and the inner tube one, thereby more be favorable to the rotation and the removal of hollow lead screw, make the operation of electric drive push rod more steady.

Furthermore, the end part of the first inner tube, far away from the driving assembly, is provided with a fixed block, the end part of the third sleeve, far away from the driving assembly, is provided with a connecting plate, the connecting plate is fixed with a fixed block screw, fixed connection between the first inner tube and the third sleeve is realized, holes are reserved on the fixed block and the connecting plate, and the screw is used for installing and fixing the connecting plate between the fixed blocks, so that installation and fixation between the first inner tube and the third sleeve are realized.

Further, two sides of the built-in nut are provided with side plates which are fixed with the built-in nut II through screws, so that an installation cavity is formed between the side plates and the built-in nut II, a bearing is installed in the installation cavity, the end part, close to the driving assembly, of the hollow lead screw extends into the installation cavity and is connected with the bearing, and therefore the rotary connection between the hollow lead screw and the built-in nut II is achieved.

Further, the end part outer side of the inner tube II, which is far away from the driving assembly, is connected and provided with a limit ring block, the end part of the sleeve II, which is far away from the driving assembly, is fixed with the limit ring block in a limiting way, the inner tube II is matched with a built-in nut II to realize the movement on the screw rod, the limit ring block is used for fixedly connecting the inner tube II and the sleeve II, so that the inner tube II and the sleeve II are combined and fixed into a whole, a telescopic joint is jointly formed between the two, the synchronous movement realizes the lifting adjustment, and the two tubes are jointly supported as the telescopic joint, so that the stability and the firmness of the whole structure can be ensured, the use safety of the whole electric driving push rod is improved, and the whole lifting adjustment process is more stable and safe.

Furthermore, be provided with spacing slot one on the spacing ring piece, be provided with spacing slot two on the inner tube two, it has spacing inserted block to run through the grafting between corresponding spacing slot one and the spacing slot two, realize spacing joint between spacing ring piece and the inner tube two through spacing inserted block, spacing inserted block runs through the grafting and corresponds between spacing slot one and the spacing slot two, realize spacing fixed between inner tube two and the spacing ring piece, and spacing inserted block and spacing slot one, can design clearance fit between the spacing slot two, ensure spacing inserted block and inner tube two, grafting compactness and fastness between the spacing ring piece, improve the reliability of connection between inner tube two and the spacing ring piece, design benefit, the installation is dismantled conveniently simply, the equipment of being convenient for reality.

Furthermore, the end parts of the first sleeve and the second sleeve, which are far away from the driving assembly, are provided with a baffle part, the baffle part comprises a first baffle plate and a second baffle plate, the first sleeve and the second sleeve are provided with a first limiting groove and a second limiting groove, the first baffle plate is provided with a first limiting column which is matched and clamped in the first limiting groove, the end part of the first limiting column extends out of the first limiting groove, the second baffle plate is provided with a second limiting column and an end baffle part, the second limiting column is matched and clamped in the second limiting groove, the end part of the second limiting column extends out of the second limiting groove, the end baffle part is abutted and limited at the corresponding end surface of the first sleeve or the second sleeve, the design of the baffle part can play a limiting role, and the baffle part on the first sleeve limits the second sleeve to be completely separated from the first sleeve, the stop part on the sleeve II limits the sleeve III to be completely separated from the sleeve II, the overall operation safety is improved, the stop part is divided into a first stop plate and a second stop plate, the first stop plate and the second stop plate are distributed at intervals along the outer side wall of the sleeve, a first limit post on the first stop plate is matched with a first limit groove, the first limit post is clamped in a corresponding first limit groove, clamping installation between the first stop plate and the first sleeve or the second sleeve is achieved, a second limit post on the second stop plate is matched with a second limit groove, the second limit post is clamped in a corresponding second limit groove, clamping installation between the second stop plate and the first sleeve or the second sleeve is achieved, the end stop part is abutted to be limited at the end face of the corresponding sleeve, and the clamping firmness of the second stop plate is further improved.

Further, be provided with constant head tank one and constant head tank two on the spacing ring piece, the extension tip that is located spacing post one on the fender position board one on the sleeve pipe two matches the joint in constant head tank one, the extension tip that is located spacing post two on the fender position board two on the sleeve pipe two matches the joint in constant head tank two, structural design is ingenious reasonable, through keeping off position board one, keep off position board two and realize the indirect connection between spacing ring piece and the sleeve pipe two, spacing post one card is gone into to correspond constant head tank one, and spacing post two card is gone into to correspond in the constant head tank two, ensure installation fastness and reliability between spacing ring piece and the sleeve pipe two, design benefit easy dismounting and simple.

Furthermore, the end portions, close to the driving assembly, of the second sleeve and the third sleeve are provided with abutting parts, buckling parts are arranged on the abutting parts, buckling grooves are formed in the inner side walls of the second sleeve and the third sleeve, the buckling parts are matched with the buckling grooves, the abutting parts are fixed to the second sleeve or the third sleeve in a buckling mode, installation and disassembly are convenient, the abutting parts can limit dislocation between the sleeves, and stability and reliability of the overall structure are further improved by cooperation with the gear parts.

The utility model discloses owing to adopted above-mentioned technical scheme, following beneficial effect has:

the utility model relates to an ingenious, simple structure is reasonable, therefore, the clothes hanger is strong in practicability, through inner tube one with the fixed one section extending structure that forms of three cooperation installations of sleeve pipe, inner tube two forms another section extending structure with two cooperation installations of sleeve pipe, every extending section all adopts the fixed formation of combination between two pipes, effectively ensure the firm reliability of overall structure, make stationarity and reliability more of whole push rod lift adjustment process, and the sleeve pipe telescopic support of big pipe diameter is placing the face in this scheme, improve overall structure stability and operational safety.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

fig. 1 is a schematic perspective view of an electric driving rod of the present invention;

fig. 2 is a schematic view of the internal cross-sectional structure of the present invention;

FIG. 3 is a schematic view of the installation structure between the second middle sleeve, the stop ring block and the second inner tube of the present invention;

FIG. 4 is a schematic view of the internal cross-sectional structure of FIG. 3;

fig. 5 is a schematic view of the mounting structure between the contact member and the third sleeve of the present invention;

FIG. 6 is a schematic view of the position distribution structure of the middle catching groove in the third sleeve of the present invention;

fig. 7 is a schematic structural view of the contact member of the present invention;

fig. 8 is a schematic view of an installation structure of the gear member on the second sleeve of the present invention;

fig. 9 is a schematic view of the position distribution structure of the first limiting groove and the second limiting groove on the second sleeve of the present invention;

fig. 10 is a schematic view of an installation structure between the first inner tube and the third sleeve of the present invention;

FIG. 11 is a schematic view of the internal cross-section of FIG. 10;

fig. 12 is a schematic view of the mounting structure between the second nut and the side plate;

fig. 13 is a schematic structural view of a first baffle plate of the present invention;

fig. 14 is a schematic structural view of a second baffle plate of the present invention;

fig. 15 is a schematic view of the position distribution structure of the second middle limiting slot of the present invention on the second inner tube;

fig. 16 is a schematic view of the position distribution structure of the middle limit ring block and the inner tube II of the present invention between the corresponding limit slot I and the limit slot II after being installed in place;

fig. 17 is a schematic view of an installation structure between the support ring seat and the hollow screw rod of the present invention;

fig. 18 is a partially enlarged schematic view of a portion I in fig. 2.

In the figure: 1-mounting a box; 2-a drive assembly; 3-a column assembly; 4-a screw mandrel; 5-a hollow screw rod; 6-inner tube I; 7-inner tube II; 8, sleeving a first sleeve; 9-sleeve II; 10-sleeve III; 11-a first built-in nut; 12-a second built-in nut; 13-splines; 14-a support ring seat; 15-arc-shaped bulge; 16-fixing block; 17-a connecting plate; 18-side plate; 19-mounting a cavity; 20-a bearing; 21-a limit ring block; 22-a first limit slot; 23-a second limiting slot; 24-limiting insert blocks; 25-a first stop plate; 26-a second baffle plate; 27-a first limit groove; 28-a first limiting groove; 29-a first limit column; 30-a second limit column; 31-an end stop; 32-positioning a groove I; 33-positioning a second groove; 34-a contact; 35-a fastening position part; 36-a catching groove; 37-extension boss.

Detailed Description

As shown in fig. 1 to 18, the electric driving push rod of the present invention comprises a mounting box 1, a driving assembly 2, a transmission assembly and a column assembly 3, wherein the driving assembly 2 is disposed in the mounting box 1, the driving assembly 2 is connected to the transmission assembly, and the driving assembly 2 drives the transmission assembly to rotate, so as to achieve the lifting operation of the column assembly 3; the transmission assembly comprises a screw rod 4 and a hollow screw rod 5 which are arranged in sequence from inside to outside; the upright post component 3 comprises an inner tube I6, an inner tube II 7, a sleeve I8, a sleeve II 9 and a sleeve III 10 which are sequentially arranged from inside to outside, the inner tube I6 is fixedly connected with the sleeve III 10, a built-in nut I11 is fixedly connected to the inner tube I6, the built-in nut I11 is screwed on the hollow screw rod 5 in a threaded mode, the inner tube II 7 is fixedly connected with the sleeve II 9, a built-in nut II 12 is fixedly connected to the inner tube II 7, the built-in nut II 12 is connected to the screw rod 4 in a threaded sliding mode, and the sleeve I8 is fixedly connected with the mounting box 1;

when the driving assembly 2 drives the screw rod 4 to rotate, the screw rod 4 drives the hollow screw rod 5 to synchronously rotate, the screw rod 4 rotates to enable the built-in nut II 12 to move along the screw rod 4, the built-in nut II 12 drives the sleeve II 9 to synchronously move through the inner pipe II 7, the hollow screw rod 5 rotates to enable the built-in nut I11 to move along the hollow screw rod 5, and the built-in nut I11 drives the sleeve III 10 to synchronously move through the inner pipe I6.

The one end of lead screw 4 is connected with drive assembly 2, and the other end fix with screw of lead screw 4 has spline 13, and spline 13 slides the joint with the inner chamber wall of hollow lead screw 5, and drive assembly 2 drives lead screw 4 and rotates, and lead screw 4 drives the synchronous rotation of hollow lead screw 5 through spline 13, and the slotted hole design on the embedded wall of spline 13 cooperation hollow lead screw 5 for lead screw 4 can drive hollow lead screw 5 and rotate in step, realizes the flexible regulation of multisection.

The tip of keeping away from drive assembly 2 on hollow lead screw 5 is provided with support ring seat 14, be provided with arc arch 15 on the lateral wall of support ring seat 14, arc arch 15 contacts with the inner chamber wall of inner tube 6, design benefit is reasonable, support ring seat 14 supports spacingly in inner tube 6, carry out the auxiliary stay to hollow lead screw 5 and consolidate, make overall structure more firm reliable, and through the ingenious design of arc arch 15, can reduce area of contact between support ring seat 14 and the inner tube 6 inner wall, thereby reduce the friction and wear between support ring seat 14 and the inner tube 6, thereby more be favorable to hollow lead screw 5's rotation and removal, make electric drive push rod's operation more steady.

The tip of keeping away from drive assembly 2 on inner tube 6 is provided with fixed block 16, the tip of keeping away from drive assembly 2 on three 10 sleeves is provided with connecting plate 17, connecting plate 17 and the 16 fix with screw of fixed block, realize the fixed connection between inner tube 6 and three 10 sleeves, it is porose to reserve on fixed block 16 and the connecting plate 17, it is fixed with the installation between the connecting plate 17 between the fixed block 16 to cooperate the screw again, thereby realize the installation between inner tube 6 and the three 10 sleeves fixed, reasonable in design, the installation is dismantled conveniently, and the fix with screw can ensure installation fastness and reliability, improve overall structure stability.

The side face of the built-in nut II 12 is provided with a side plate 18, the side plate 18 is fixed with the built-in nut II 12 through screws, a mounting cavity 19 is formed between the side plate 18 and the built-in nut II 12, a bearing 20 is mounted in the mounting cavity 19, the end portion, close to the driving component 2, of the hollow lead screw 5 extends into the mounting cavity 19 and is connected with the bearing 20, so that the hollow lead screw 5 is rotatably connected with the built-in nut II 12, the design is compact and reasonable, the mounting cavity 19 is formed between the side plate 18 and the built-in nut II 12 in an assembling mode, the bearing 20 is just mounted and arranged in the mounting cavity 19, the hollow lead screw 5 is connected with the bearing 20, indirect hinging between the hollow lead screw 5 and the built-in nut II 12 is achieved through the bearing 20, the friction resistance between the end portion of the hollow lead screw 5 and the built-in nut II 12 is reduced, the rotation precision of the hollow lead screw 5 is guaranteed, hole-fit screws are reserved on the side plate 18 and the built-in nut II 12 to achieve mounting and fixing, the mounting firmness between the side plate 18 and the built-in nut II 12 is effectively guaranteed, and the mode is convenient to be actually dismounted.

The end part outer side of the inner tube II 7, which is far away from the driving assembly 2, is connected with a limiting ring block 21, the end part of the sleeve II 9, which is far away from the driving assembly 2, is fixed with the limiting ring block 21 in a limiting way, the inner tube II 7 is matched with a built-in nut II 12 to realize the movement on the screw rod 4, the limiting ring block 21 is connected and fixed between the inner tube II 7 and the sleeve II 9, so that the inner tube II 7 and the sleeve II 9 are combined and fixed into a whole, an expansion joint is formed between the two, the lifting adjustment is realized by synchronous movement, and the expansion joint is supported between the two tubes together, so that the stability and the firmness of the whole structure are ensured, the use safety of the whole electric driving push rod is improved, and the whole lifting adjustment process is more stable and safe.

The limiting ring block 21 is provided with a first limiting slot 22, the inner tube II 7 is provided with a second limiting slot 23, a first limiting slot 22 and a second limiting slot 23 are arranged between the first limiting slot 22 and the second limiting slot 23 in a corresponding penetrating and inserting mode, a limiting insertion block 24 is arranged between the first limiting slot 22 and the second limiting slot 23 in a corresponding penetrating and inserting mode, limiting fixing between the second inner tube 7 and the limiting ring block 21 is achieved, the first limiting slot 22 and the second limiting slot 23 can be designed to be in clearance fit, the second limiting insertion block 24 and the second inner tube 7 are guaranteed, inserting tightness and firmness between the limiting ring block 21 are guaranteed, connection reliability between the second inner tube 7 and the limiting ring block 21 is improved, design is ingenious, mounting and dismounting are convenient and simple, and practical assembling is facilitated.

The end parts of the first sleeve 8 and the second sleeve 9, which are far away from the driving component 2, are provided with a blocking part, the blocking part comprises a first blocking plate 25 and a second blocking plate 26, the first sleeve 8 and the second sleeve 9 are provided with a first limiting groove 27 and a second limiting groove 28, the first blocking plate 25 is provided with a first limiting column 29, the first limiting column 29 is in matched clamping connection with the first limiting groove 27, the end part of the first limiting column 29 extends out of the first limiting groove 27, the second blocking plate 26 is provided with a second limiting column 30 and an end blocking part 31, the second limiting column 30 is in matched clamping connection with the second limiting groove 28, the end part of the second limiting column 30 extends out of the second limiting groove 28, the end blocking part 31 is in contact with and limited at the corresponding end surface of the first sleeve 8 or the second sleeve 9, the blocking part is designed to play a limiting role, the second sleeve 9 is limited from being completely separated from the first sleeve 8, the third sleeve 9 is limited by the blocking part on the second sleeve 9, the overall operation safety is improved, the gear parts are divided into a first gear plate 25 and a second gear plate 26, the first gear plate 25 and the second gear plate 26 are distributed at intervals along the outer side wall of the sleeve, the cross section of the sleeve is of a square structure, a first limiting column 29 on the first gear plate 25 is matched with a first limiting groove 27, the first limiting column 29 is clamped in the corresponding first limiting groove 27 to realize clamping installation between the first gear plate 25 and the first sleeve 8 or the second sleeve 9, a second limiting column 30 on the second gear plate 26 is matched with a second limiting groove 28, the second limiting column 30 is clamped in the corresponding second limiting groove 28 to realize clamping installation between the second gear plate 26 and the first sleeve 8 or the second sleeve 9, an end stop part 31 is abutted and limited at the end face corresponding to the sleeve, the clamping firmness of the second gear plate 26 is further improved, an opening is arranged on the second limiting column 30, and an abutting convex point is arranged on the side face of the second limiting column 30, the opening design can be convenient for the second limiting column 30 to be deformed and clamped into the second limiting groove 28, and the abutting convex points can limit the separation of the second limiting column 30 from the second limiting groove 28 after the second limiting column is clamped into the second limiting groove, so that the clamping firmness and the reliability are improved.

Be provided with constant head tank one 32 and constant head tank two 33 on spacing ring piece 21, the extension tip of spacing post one 29 on the fender position board one 25 that is located sleeve pipe two 9 matches the joint in constant head tank one 32, the extension tip of spacing post two 30 on the fender position board two 26 that is located sleeve pipe two 9 matches the joint in constant head tank two 33, structural design is ingenious reasonable, through keeping off position board one 25, keep off position board two 26 and realize the indirect connection between spacing ring piece 21 and sleeve pipe two 9, spacing post one 29 blocks into corresponding constant head tank one 32, and spacing post two 30 blocks into corresponding constant head tank two 33, ensure installation fastness and reliability between spacing ring piece 21 and the sleeve pipe two 9, design benefit easy dismounting and simple.

The tip that is close to drive assembly 2 on two 9 and three 10 sleeves all is provided with support part 34, be provided with on the support part 34 and detain position portion 35, all be provided with on the inside wall of two 9 sleeves and the inside wall of three 10 sleeves and detain position groove 36, it matches the lock joint in detaining position groove 36 to detain position portion 35, it is fixed to realize the lock joint between support part 34 and two 9 sleeves or the three 10 sleeves, the installation is dismantled conveniently, and support part 34 also can restrict the disjointing between the sleeve pipe, further improve overall structure stability and reliability with fender position part cooperation, the tip of support part 34 extends the protrusion and forms and extends boss 37, it is spacing at the sheathed tube corresponding tip to extend boss 37 conflict, improve the installation stability between support part 34 and the sleeve pipe.

The above is only a specific embodiment of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions or modifications based on the present invention to achieve substantially the same technical effects are all covered by the scope of the present invention.

Claims (10)

1. An electrically driven push rod comprising:

mounting a box;

the driving assembly is arranged in the mounting box;

the driving assembly is connected with the transmission assembly;

the driving assembly drives the transmission assembly to rotate so as to realize the lifting operation of the stand column assembly;

the method is characterized in that:

the transmission assembly comprises a screw rod and a hollow screw rod which are sequentially arranged from inside to outside;

the upright post assembly comprises an inner tube I, an inner tube II, a sleeve I, a sleeve II and a sleeve III which are sequentially arranged from inside to outside, and the sleeve I is fixedly connected with the mounting box;

the first inner pipe is fixedly connected with the third sleeve, a first built-in nut is connected to the hollow screw rod in a sliding mode through threads, the first built-in nut is fixedly connected with the first inner pipe, the second inner pipe is fixedly connected with the second sleeve, a second built-in nut is connected to the screw rod in a sliding mode through threads, and the second built-in nut is fixedly connected with the second inner pipe;

when the driving assembly drives the screw rod to rotate, the screw rod drives the hollow screw rod to synchronously rotate, the screw rod rotates to enable the built-in nut II to move along the screw rod, the built-in nut II drives the sleeve II to synchronously move through the inner tube II, the hollow screw rod rotates to enable the built-in nut I to move along the hollow screw rod, and the built-in nut drives the sleeve III to synchronously move through the inner tube.

2. An electrically driven push rod according to claim 1, wherein: the one end of lead screw with drive assembly is connected, the other end fix with screw of lead screw has the spline, the spline with the inner chamber wall slip joint of hollow lead screw, drive assembly drives the lead screw rotates, and the lead screw passes through the spline drives hollow lead screw's synchronous rotation.

3. An electrically driven push rod according to claim 1, wherein: keep away from on the hollow screw drive assembly's tip is provided with the support ring seat, be provided with the arc arch on the lateral wall of support ring seat, the arc arch with the inner chamber wall of inner tube one contacts.

4. An electrically driven push rod according to claim 1, wherein: the end part, far away from the driving assembly, of the first inner pipe is provided with a fixed block, the end part, far away from the driving assembly, of the third sleeve is provided with a connecting plate, and the connecting plate is fixed with the fixed block through screws, so that the first inner pipe is fixedly connected with the third sleeve.

5. An electrically driven push rod according to claim 1, wherein: and side plates are arranged on two sides of the built-in nut, and are fixed with the built-in nut II through screws, so that an installation cavity is formed between the side plates and the built-in nut II, a bearing is arranged in the installation cavity, and the end part of the hollow lead screw, which is close to the driving assembly, extends into the installation cavity and is connected with the bearing, so that the hollow lead screw is rotatably connected with the built-in nut II.

6. An electrically driven push rod according to claim 1, wherein: the outer side of the end part, far away from the driving assembly, of the inner tube II is provided with a limiting ring block in a connected mode, and the end part, far away from the driving assembly, of the sleeve II is fixed with the limiting ring block in a limiting mode.

7. An electrically driven push rod according to claim 6, wherein: the limiting ring block is provided with a first limiting slot, the inner tube II is provided with a second limiting slot, a first limiting slot is inserted between the first limiting slot and the second limiting slot in a penetrating and inserting mode, and limiting clamping between the first limiting slot and the second limiting slot is achieved through the second limiting slot.

8. An electrically driven push rod according to claim 6, wherein: the sleeve pipe one with keep away from on the sleeve pipe two drive assembly's tip all is provided with the fender position spare, keep off the position spare and include fender position board one and keep off position board two, sleeve pipe one with all be provided with spacing groove one and spacing groove two on the sleeve pipe two, keep off and be provided with spacing post one on the position board one, spacing post one matches the joint and is in spacing groove one, just the tip of spacing post one extends spacing groove one, be provided with spacing post two and end stop part on the fender position board two, spacing post two matches the joint and is in spacing groove two, just the tip of spacing post two extends spacing groove two, end stop part is contradicted spacing sleeve pipe one or the corresponding terminal surface department of sleeve pipe two.

9. An electrically driven push rod according to claim 8, wherein: the limiting ring block is provided with a first positioning groove and a second positioning groove, the first positioning groove and the second positioning groove are located on the sleeve pipe, the first limit column on the first limit column blocking plate is matched with the first positioning groove in a clamped mode, and the second limit column on the second limit column blocking plate on the sleeve pipe is matched with the second limit column in a clamped mode in the second positioning groove.

10. An electrically driven push rod according to claim 1, wherein: the end parts, close to the driving assembly, of the second sleeve and the third sleeve are provided with abutting parts, buckling parts are arranged on the abutting parts, buckling grooves are formed in the inner side walls of the second sleeve and the third sleeve, the buckling parts are matched and buckled in the buckling grooves, and the abutting parts and the second sleeve or the third sleeve are buckled and fixed.

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