CN218185898U

CN218185898U - Self-locking lifting stand column

Info

Publication number: CN218185898U
Application number: CN202222284414.4U
Authority: CN
Inventors: 项乐宏; 蒋领辉; 贝雷贤; 陶闽泉; 吴凯
Original assignee: Loctek Ergonomic Technology Co Ltd
Current assignee: Loctek Ergonomic Technology Co Ltd
Priority date: 2022-08-26
Filing date: 2022-08-26
Publication date: 2023-01-03
Anticipated expiration: 2032-08-26

Abstract

The utility model discloses a self-locking lifting upright post, which comprises a telescopic pipe, a lifting upright post and a lifting mechanism, wherein the telescopic pipe is provided with an inner pipe and at least one outer pipe sleeved on the inner pipe in a sliding way; the linear driving mechanism is connected in the inner pipe and connected with the outer pipe, and is provided with an input shaft which can drive the outer pipe to slide axially relative to the inner pipe when rotating around the axis; the driving motor is connected in the inner pipe, is in transmission connection with the input shaft and is used for driving the input shaft to rotate; an installation space is arranged between the outer end of the driving motor and the top end of the inner tube; the driving circuit board is connected in the installation space, the driving circuit board is electrically connected with the driving motor, a connecting wire is installed on the driving circuit board, and the connecting end of the connecting wire is led out outwards and is arranged outside the inner pipe. The self-locking lifting upright post is simple in mounting structure, does not occupy space and is strong in self-locking capacity.

Description

Self-locking lifting stand column

Technical Field

The utility model relates to the technical field of furniture, what specifically say is a auto-lock lift stand.

Background

The lifting upright post, also called an electric push rod, structurally comprises a driving motor, a telescopic pipe and a linear driving mechanism, wherein the linear driving mechanism is generally a lead screw nut pair, is connected in the telescopic pipe and is in transmission connection with the driving motor, and the driving motor acts to drive the linear driving mechanism to stretch and retract so as to expand or contract the telescopic pipe, namely the lifting upright post can convert the rotation of the driving motor into the linear motion of the telescopic pipe. The lifting upright post is widely applied to electric lifting tables, electric lifting beds, lifting platforms and the like, and is used as a lifting table leg, a bed leg or a lifting support rod and the like.

The drive motor of the conventional lifting upright column in the prior art is generally arranged at the upper end of the outer side of a telescopic pipe, as disclosed in patent application with the publication number of CN207659000U, the structure of the lifting upright column comprises a motor shell, a drive motor connected in the motor shell and the telescopic pipe connected at the bottom of the motor shell, a linear drive mechanism capable of extending and retracting the telescopic pipe is arranged in the telescopic pipe, and a lead screw of the linear drive mechanism is in transmission connection with the drive motor; the driving motor of the lifting upright post is arranged outside, so that the whole volume is larger, the driving motor needs a larger motor shell for protection, the whole weight is heavier, and the lifting upright post is inconvenient to transport and install; in order to reduce the packaging volume of the lifting upright post and well protect the driving motor, people directly arrange the driving motor in the telescopic tube of the lifting upright post, namely arrange the driving motor and the speed reducer in the telescopic tube and at the same side of the transmission assembly, the driving motor is connected with the speed reducer, the output shaft of the speed reducer is in transmission connection with the lead screw of the transmission assembly, and the driving motor drives the lead screw of the transmission assembly to rotate through the speed reducer, so that the telescopic tube stretches out and draws back. The driving circuit board of the driving motor of the lifting upright post is generally arranged outside the telescopic pipe, in order to ensure the connection stability and the safety of the driving circuit board, a mounting plate is connected on the outer side of the telescopic pipe or a cross beam below the lifting table top, the driving circuit board is mounted on the mounting plate, and then a driving plate cover covered on the driving circuit board is connected on the mounting plate, so that the driving circuit board is positioned between the driving plate cover and the mounting plate. This driving circuit board sets up the lift stand in flexible pipe outside, because of driving circuit board's installation need dispose driving circuit board's mounting panel and driving plate lid, consequently mounting structure is more complicated, and the user also is more troublesome when the installation lift stand, has increased the packing volume of lift stand and has taken the space of table or bedstead or lift platform below moreover. Moreover, the lifting upright post of the prior art is generally poor in self-locking capacity, large in bearing weight and capable of passively contracting the linear driving mechanism under the pressure of bearing when the driving motor stops, so that the motor is damaged or the threads in the linear driving mechanism are abraded.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome above prior art's defect, provide a mounting structure simple, occupation space and auto-lock ability reinforce's auto-lock lift stand.

The technical solution of the utility model is that, a auto-lock lift stand that has following structure is provided: it comprises

The telescopic pipe is provided with an inner pipe and at least one outer pipe which is sleeved on the inner pipe in a sliding way;

the linear driving mechanism is connected with the inner pipe and the outer pipe, and is provided with an input shaft which can drive the outer pipe to slide along the axial direction relative to the inner pipe when rotating around the axis in the circumferential direction;

the driving motor is connected in the inner pipe, is in transmission connection with the input shaft and is used for driving the input shaft to rotate; an installation space is arranged between the outer end of the driving motor and the top end of the inner tube;

the driving circuit board is connected in the installation space, the driving circuit board is electrically connected with the driving motor, a connecting wire is installed on the driving circuit board, and the connecting end of the connecting wire is led out outwards and is arranged outside the inner pipe.

After the structure more than adopting, the utility model relates to a self-locking lifting column compares with prior art, has following advantage: this auto-lock lift stand installs driving motor in the inner tube of flexible pipe, can dwindle the whole volume of lift stand like this, practices thrift the packing space, and does not occupy the space of table or bedstead or lift platform below, also plays fine guard action to driving motor. Especially, the driving circuit board is arranged in the installation space between the outer end of the driving motor and the top end of the inner pipe, so that the driving circuit board is arranged in the telescopic pipe, the wiring between the driving circuit board and the driving motor is shortened, the action of the driving motor is more sensitive, the arrangement of the installation plate and the driving plate cover outside the lifting upright post is avoided, external materials are saved, when the lifting upright post is installed, only the upper end of the lifting upright post is required to be connected with the bottom of a table plate or a bed frame or a lifting platform, the installation structure is simple, and the installation by a user is convenient; moreover, this drive circuit board is connected with the hand controller through the connecting wire that outwards draws and set up in the inner tube outside, and convenience of customers connects hand controller or operation end.

Preferably, a mounting box is connected in the mounting space, an opening is formed in the upper end of the mounting box in an open mode, a top cover is connected to the opening, and the driving circuit board is connected in the mounting box; the top end of the inner pipe is connected with a connecting plate, and the mounting space is formed between the connecting plate and the driving motor; the connecting plate is abutted against the upper end of the top cover, and the connecting plate is provided with a threading hole which is communicated with the interior of the mounting box and through which the connecting wire passes. By the arrangement, the driving circuit board can be mounted more simply and conveniently, and the mounting structure is simple and convenient.

Preferably, the outer end of the driving motor is provided with a connecting column extending towards the connecting plate, and the outer side wall of the mounting box is provided with a groove for clamping the connecting column; the mounting box is characterized in that a mounting hole is formed in the connecting plate, a locking screw is connected in the mounting hole, and the free end of the locking screw penetrates through the top cover and then is in threaded connection with a threaded hole in the center of the connecting column and is used for locking the mounting box between the driving motor and the connecting plate. Set up like this, the spliced pole of driving motor outer end and the recess joint on the mounting box can avoid the mounting box to rock, and in addition the locking screw makes the mounting box spacing in the installation space between connecting plate and driving motor with being connected of spliced pole, makes the connection of mounting box more stable like this.

Preferably, the number of the connecting columns is two, two grooves for clamping the connecting columns are formed in the outer side wall of the mounting box, and the two grooves are respectively located on two parallel outer side walls of the mounting box; the connecting plate is connected with two locking screws, and the free ends of the two locking screws are respectively in threaded connection with the threaded holes of the two connecting columns. Set up like this, can further avoid the mounting box to rock, make more firm that the mounting box is connected to the stability that the drive circuit board in the messenger mounting box is connected is high.

Preferably, two recesses form two convex parts on the inner wall of the mounting box, and the driving circuit board is provided with two notches matched and clamped with the two convex parts. By the arrangement, the driving circuit board can be prevented from shaking, and the connection stability of the driving circuit board is further improved.

Preferably, the input shaft is sleeved with a torsion spring seat which synchronously rotates along with the input shaft, the outer side wall of the torsion spring seat is provided with a radially outward protruding annular spacer, the outer side wall of the torsion spring seat is divided into a first installation part and a second installation part which are arranged from top to bottom by the annular spacer, and the first installation part and the second installation part are respectively sleeved with a first torsion spring and a second torsion spring; the inner wall of the inner pipe is connected with a base which is sleeved outside the torsion spring seat, the inner wall of the central hole of the base is provided with a clamping groove which extends along the axial direction of the central hole, first clamping pins of the first torsion spring and the second torsion spring are in clearance fit in the clamping groove, and second clamping pins of the first torsion spring and the second torsion spring are in clearance fit in a clearance between the inner wall of the central hole of the base and the torsion spring seat; when the driving motor drives the input shaft to rotate, the input shaft drives the torsion spring seat to overcome the friction force of the first torsion spring and the second torsion spring to synchronously rotate; when the driving motor stops rotating and the input shaft passively rotates under the axial pressure, the torsion spring seat enables the first torsion spring and the second torsion spring to simultaneously hold the torsion spring seat tightly along the spiral direction, and the input shaft stops rotating. The first torsion spring and the second torsion spring can simultaneously hold the torsion spring seat along the spiral direction when the driving motor stops rotating and the input shaft passively rotates under the axial pressure, and the friction force between the outer side wall of the torsion spring seat and the first torsion spring and the friction force between the outer side wall of the torsion spring seat and the second torsion spring enable the torsion spring seat and the input shaft to be self-locked; the self-locking force of the input shaft is stronger due to the arrangement of the double torsional springs on the torsional spring seat; in other words, the self-locking upright post has strong bearing capacity, is not easy to slide down due to bearing of a table plate, a bed frame or a lifting platform and the like, and has good safety.

Preferably, the number of the outer tubes is two, and from inside to outside, the outer tubes are sequentially: a first outer tube and a second outer tube; the linear driving mechanism comprises

A lead screw, an input end of which forms the input shaft; the screw rod is in threaded connection with a first transmission nut, the first transmission nut is connected with a first supporting pipe for limiting the circumferential rotation of the first transmission nut, and the first supporting pipe is connected with a first outer pipe;

the wire tube is sleeved on the lead screw, the wire tube is circumferentially limited relative to the lead screw, the axial direction of the wire tube can slide to generate displacement, a second transmission nut is connected to the outer side wall of the wire tube in a threaded mode, a second supporting tube for limiting circumferential rotation of the second transmission nut is connected to the second transmission nut, and the second supporting tube is connected with a second outer tube. The driving motor drives the screw rod to rotate, so that the first transmission nut drives the first supporting pipe and the first outer pipe to move axially at the same time, and the first transmission nut drives the screw pipe to move axially relative to the screw rod while moving axially along the screw rod; and the rotation of lead screw drives the synchronous rotation of silk pipe to make second drive nut drive second stay tube and second outer tube along axial motion, thereby make first outer tube and second outer tube flexible for the inner tube.

Preferably, the telescopic pipe is a telescopic pipe with a square or round cross section. The utility model discloses do not restrict the shape of flexible pipe, in other embodiments, this flexible pipe also can be for oval-shaped elliptical tube or polygon venturi tube etc. for the cross section.

Drawings

Fig. 1 is a schematic structural view of the self-locking lifting column of the present invention.

Fig. 2 is a schematic view of an assembly structure of the self-locking lifting column of the present invention.

Fig. 3 is a schematic view of the installation structure of the driving circuit board of the self-locking lifting column of the present invention.

Fig. 4 is a schematic view of a cross-sectional structure of the self-locking lifting column of the present invention.

Fig. 5 is a schematic view of the installation structure of the torsion spring seat of the self-locking lifting column of the present invention.

Fig. 6 is a schematic structural view of the base of the self-locking lifting column of the present invention.

Fig. 7 is a schematic cross-sectional view of the torsion spring seat and the input shaft of the self-locking lifting column of the present invention.

As shown in the figure:

1. the telescopic tube comprises a telescopic tube 100, an inner tube 101, a first outer tube 102, a second outer tube 103, a connecting plate 104, a threading hole 105, a mounting hole 106, a locking screw 2, a linear driving mechanism 200, a lead screw 201, an input shaft 202, a torsion spring seat 203, an annular spacer 204, a first mounting part 205, a second mounting part 206, a base 207, a clamping groove 208, a first transmission nut 209, a first supporting tube 210, a wire tube 211, a second transmission nut 212, a second supporting tube 3, a driving motor 300, a connecting column 301, a threaded hole 4, a mounting box 400, a top cover 401, a groove 402, a convex part 5, a driving circuit board 500, a connecting line 501, a notch 6, a first torsion spring 600, a second torsion spring 601, a first clamping foot 602, a second clamping foot 7 and a speed reducer.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

See FIGS. 1-7;

the embodiment of the utility model discloses auto-lock lift stand, it is applied to among electric lift table, electric lift bed or lift platform etc for the table of drive electric lift table, the bedstead of electric lift bed or lift platform's cargo platform go up and down, make electric lift table, electric lift bed or lift platform go up and down with height-adjusting. The self-locking lifting upright post structurally comprises an extension tube 1, a linear driving mechanism 2, a driving motor 3 and a driving circuit board 5, wherein the extension tube 1 is provided with an inner tube 100 and at least one outer tube which is sleeved on the inner tube 100 in a sliding manner; in this embodiment, the number of the tubes is two, that is, the number of the tubes from the inside to the outside is: a first outer tube 101 and a second outer tube 102; the term "from inside to outside" means from inside to outside with the inner tube 100 as the center. The linear driving mechanism 2 of the present embodiment is connected in the inner tube 100 and connected with the outer tube, the linear driving mechanism 2 has an input shaft 201, and the input shaft 201 can drive the outer tube to slide axially relative to the inner tube 100 when rotating circumferentially around the axis; the driving motor 3 is connected in the inner tube 100, and the driving motor 3 is in transmission connection with the input shaft 201 and is used for driving the input shaft 201 to rotate; an installation space is arranged between the outer end of the driving motor 3 and the top end of the inner tube 100, and the driving motor 3 of the embodiment is a brushless direct current motor; this auto-lock lift stand installs driving motor 3 in the inner tube 100 of flexible pipe 1, can dwindle the whole volume of lift stand like this, practices thrift the packing space, and does not occupy the space of table or bedstead or lift platform below, also plays fine guard action to driving motor 3. In the present embodiment, the telescopic tube 1 is a telescopic tube 1 having a square or circular cross section. In other embodiments, the telescopic tube 1 may be an elliptical tube or a polygonal tube having an elliptical cross section. The driving circuit board 5 of the present embodiment is electrically connected to the driving motor 3 through a wire, the driving circuit board 5 is used for controlling the driving motor 3 to operate, stop or automatically stop the driving motor 3 for a certain time, and the driving circuit board 5 is a product of the prior art and will not be described in detail in the present embodiment.

In the present embodiment, the output shaft of the driving motor 3 is connected to the speed reducer 7, and the output shaft of the speed reducer 7 is in transmission connection with the input shaft 201.

The linear driving mechanism 2 in this embodiment is substantially a screw 200 nut pair, which is a prior art product, and includes a screw 200 rotatably connected in a central hole of the inner tube 100 through a bearing, and an input end of the screw 200 forms the input shaft 201; a first transmission nut 208 is connected to the screw rod 200 in a threaded manner, a first support tube 209 for limiting the circumferential rotation of the first transmission nut 208 is connected to the first transmission nut 208, and the lower end of the first support tube 209 is connected to the lower end of the first outer tube 101; the input shaft 201 of the screw rod 200 is rotated by the driving motor 3, and the circumferential rotation of the first transmission nut 208 is restricted by the first support tube 209, so that when the screw rod 200 is rotated, the first transmission nut 208 and the first support tube 209 simultaneously move in the axial direction of the screw rod 200, thereby expanding or contracting the first outer tube 101 with respect to the inner tube 100; the linear driving mechanism 2 further comprises a wire tube 210 sleeved on the lead screw 200, the wire tube 210 is circumferentially limited relative to the lead screw 200 and can axially slide to generate displacement, a second transmission nut 211 is connected to the outer side wall of the wire tube 210 in a threaded manner, a second support tube 212 for limiting the second transmission nut 211 to rotate circumferentially is connected to the second transmission nut 211, and the second support tube 212 is connected to the second outer tube 102. The rotation of the lead screw 200 drives the wire tube 210 to rotate synchronously, so that the second driving nut 211 drives the second support tube 212 and the second outer tube 102 to move axially, thereby extending and retracting the second outer tube 102 relative to the inner tube 100. The telescopic tube 1 of the present embodiment is a three-section tube, that is, an inner tube 100, a first outer tube 101 and a second outer tube 102, the linear driving mechanism 2 is adapted to the telescopic tube 1, and can be set according to the number of the tubes of the telescopic tube 1, the transmission principle and structure thereof are technical means of the prior art, and the present embodiment is not described in detail.

The utility model discloses auto-lock lift stand still includes dirver circuit board 5, dirver circuit board 5 is connected in the installation space,

dirver circuit board

5 and 3 electric connection of driving motor, and install connecting wire 500 on dirver circuit board 5, connecting wire 500's link is outwards drawn forth and is set up in the inner tube 100 outside. In the embodiment, the driving circuit board 5 is arranged in the installation space between the outer end of the driving motor 3 and the top end of the inner tube 100, so that the driving circuit board 5 is arranged in the extension tube 1, the wiring between the driving circuit board 5 and the driving motor 3 is shortened, the action of the driving motor 3 is more sensitive, the arrangement of the installation plate and the driving plate cover outside the lifting upright post is avoided, external materials are saved, when the lifting upright post is installed, only the upper end of the lifting upright post needs to be connected with the bottom of a table plate or a bedstead or a lifting platform, the installation structure is simple, and the installation is convenient for a user; furthermore, the driving circuit board 5 is connected to the hand controller through a connecting wire 500 led out and disposed outside the inner tube 100, so that a user can conveniently connect the hand controller or the operation terminal.

Referring again to fig. 2 and 3, as an embodiment of the present invention; a mounting box 4 is connected in the mounting space, an opening is formed in the upper end of the mounting box 4 in an open mode, a top cover 400 is connected to the opening, and the driving circuit board 5 is connected in the mounting box 4; the top end of the inner pipe 100 is connected with a connecting plate 103, and the mounting space is formed between the connecting plate 103 and the driving motor 3; the connecting plate 103 is abutted against the upper end of the top cover 400, and the connecting plate 103 is provided with a threading hole 104 which is communicated with the inside of the mounting box 4 and through which the connecting wire 500 passes. By the arrangement, the driving circuit board 5 is simpler and more convenient to install, the driving circuit board 5 only needs to be installed in the installation box 4, and the installation structure is simple and convenient to install. Further, in order to make the connection of the mounting box 4 more stable, the outer end of the driving motor 3 is provided with a connecting column 300 extending towards the connecting plate 103, and a groove 401 for the connecting column 300 to be clamped is arranged on the outer side wall of the mounting box 4; the mounting structure is characterized in that a mounting hole 105 is formed in the connecting plate 103, a locking screw 106 is connected in the mounting hole 105, and the free end of the locking screw 106 penetrates through the top cover 400 and then is in threaded connection with a threaded hole 301 in the center of the connecting column 300 to lock the mounting box 4 between the driving motor 3 and the connecting plate 103. Specifically, there are two connecting columns 300, and two grooves 401 for the connecting columns 300 to be clamped into are provided on the outer side wall of the mounting box 4, and the two grooves 401 are respectively located on two parallel outer side walls of the mounting box 4; two locking screws 106 are connected to the connecting plate 103, and the free ends of the two locking screws 106 are respectively in threaded connection with the threaded holes 301 of the two connecting posts 300. Also when the driving circuit board 5 is installed, firstly connect the driving circuit board 5 in the bottom of the mounting box 4, cover the top cover 400, then connect two grooves 401 of the mounting box 4 on two connecting posts 300 of the driving motor 3, thus preventing the mounting box 4 from moving, then install the driving motor 3 connected with the mounting box 4 in the inner hole of the inner tube 100, finally, two locking screws 106 of the connecting plate 103 pass through the top cover 400 and then are respectively in threaded connection with the threaded holes 301 of the two connecting posts 300, thus the mounting box 4 and the driving motor 3 are simultaneously fixed in the inner tube 100.

Referring again to fig. 3, as an embodiment of the present invention; two grooves 401 form two convex parts 402 on the inner wall of the mounting box 4, and the driving circuit board 5 is provided with two notches 501 matched and clamped with the two convex parts 402. When the driving circuit board 5 is installed, the two notches 501 of the driving circuit board 5 can be clamped on the two convex parts 402 on the inner wall of the installation box 4, so that the driving circuit board 5 can be prevented from shaking, and the connection stability of the driving circuit board 5 is further improved.

Referring again to fig. 5, 6 and 7, as an embodiment of the present invention; the input shaft 201 of the linear driving mechanism 2 is sleeved with a torsion spring seat 202 which synchronously rotates along with the input shaft 201, that is, the input shaft 201 is tightly matched with a central hole of the torsion spring seat 202 or a tangent plane is arranged on the input shaft 201, and the inner wall of the central hole of the torsion spring seat 202 is provided with a plane matched and attached with the tangent plane, so that the torsion spring seat 202 and the input shaft 201 synchronously rotate; the outer side wall of the torsion spring seat 202 of the embodiment is provided with a radially outward protruding annular spacer 203, the outer side wall of the torsion spring seat 202 is divided into a first mounting part 204 and a second mounting part 205 which are arranged from top to bottom by the annular spacer 203, and the first mounting part 204 and the second mounting part 205 are respectively sleeved with a first torsion spring 6 and a second torsion spring 600; the inner wall of the inner tube 100 is connected with a base 206 sleeved outside the torsion spring seat 202, and the base 206 is fixedly connected with a speed reducer 7 at the output end of the driving motor 3 through screws; a clamping groove 207 extending along the axial direction of the central hole is arranged on the inner wall of the central hole of the base 206, the first clamping feet 601 of the first torsion spring 6 and the second torsion spring 600 are in clearance fit in the clamping groove 207, and the second clamping feet 602 of the first torsion spring 6 and the second torsion spring 600 are in clearance fit in the clearance between the inner wall of the central hole of the base 206 and the torsion spring seat 202; when the driving motor 3 drives the input shaft 201 to rotate, the input shaft 201 drives the torsion spring seat 202 to synchronously rotate against the friction force of the first torsion spring 6 and the second torsion spring 600; when the rotation of the drive motor 3 is stopped and the input shaft 201 is passively rotated by the axial pressing force, the torsion spring seat 202 causes the first torsion spring 6 and the second torsion spring 600 to simultaneously hold the torsion spring seat 202 in the spiral direction, stopping the rotation of the input shaft 201. Two torsion springs are arranged on the torsion spring seat 202, when the driving motor 3 stops rotating and the input shaft 201 passively rotates under axial pressure, the first torsion spring 6 and the second torsion spring 600 can simultaneously hold the torsion spring seat 202 tightly along the spiral direction due to the friction between the outer side wall of the torsion spring seat 202 and the first torsion spring 6 and the second torsion spring 600, so that the torsion spring seat 202 and the input shaft 201 are self-locked; due to the arrangement of the double torsion springs on the torsion spring seat 202, the self-locking force of the input shaft 201 is stronger; in other words, the self-locking upright post has strong bearing capacity, is not easy to slide down due to bearing of a table plate, a bed frame or a lifting platform and the like, and has good safety.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a self-locking lifting column which characterized in that: it comprises

2. The self-locking lifting column according to claim 1, characterized in that: the mounting box is connected in the mounting space, an opening is formed in the upper end of the mounting box in an open mode, the opening is connected with a top cover, and the driving circuit board is connected in the mounting box; the top end of the inner pipe is connected with a connecting plate, and the mounting space is formed between the connecting plate and the driving motor; the connecting plate is abutted against the upper end of the top cover, and a threading hole which is communicated with the mounting box and through which the connecting wire penetrates is formed in the connecting plate.

3. The self-locking lifting column according to claim 2, characterized in that: the outer end of the driving motor is provided with a connecting column extending towards the direction of the connecting plate, and the outer side wall of the mounting box is provided with a groove for the connecting column to be clamped; the mounting box is characterized in that a mounting hole is formed in the connecting plate, a locking screw is connected in the mounting hole, and the free end of the locking screw penetrates through the top cover and then is in threaded connection with a threaded hole in the center of the connecting column and is used for locking the mounting box between the driving motor and the connecting plate.

4. The self-locking lifting column according to claim 3, wherein: the mounting box comprises a mounting box body, a plurality of connecting columns and a plurality of grooves, wherein the number of the connecting columns is two, the outer side wall of the mounting box body is provided with two grooves for clamping the connecting columns, and the two grooves are respectively positioned on two parallel outer side walls of the mounting box body; the connecting plate is connected with two locking screws, and the free ends of the two locking screws are respectively in threaded connection with the threaded holes of the two connecting columns.

5. The self-locking lifting column according to claim 4, wherein: two recesses form two convex parts on the inner wall of mounting box, be equipped with two and the breach of two convex parts matching joint on the dirver circuit board.

6. The self-locking lifting column according to claim 1, characterized in that: the input shaft is sleeved with a torsion spring seat which synchronously rotates along with the input shaft, the outer side wall of the torsion spring seat is provided with a radially outward-protruding annular spacer, the outer side wall of the torsion spring seat is divided into a first mounting part and a second mounting part which are arranged from top to bottom by the annular spacer, and the first mounting part and the second mounting part are respectively sleeved with a first torsion spring and a second torsion spring; the inner wall of the inner pipe is connected with a base which is sleeved on the outer side of the torsion spring seat, the inner wall of the central hole of the base is provided with a clamping groove which extends along the axial direction of the central hole, first clamping pins of the first torsion spring and the second torsion spring are in clearance fit in the clamping groove, and second clamping pins of the first torsion spring and the second torsion spring are in clearance fit in a clearance between the inner wall of the central hole of the base and the torsion spring seat; when the driving motor drives the input shaft to rotate, the input shaft drives the torsion spring seat to overcome the friction force of the first torsion spring and the second torsion spring to synchronously rotate; when the driving motor stops rotating and the input shaft passively rotates under the axial pressure, the torsion spring seat enables the first torsion spring and the second torsion spring to simultaneously hold the torsion spring seat tightly along the spiral direction, and the input shaft stops rotating.

7. The self-locking lifting column according to claim 6, wherein: the outer tube be two, and from inside to outside in proper order be: a first outer tube and a second outer tube; the linear driving mechanism comprises

the wire tube is sleeved on the lead screw, the wire tube generates displacement in a circumferential limiting mode and an axial sliding mode relative to the lead screw, a second transmission nut is connected to the outer side wall of the wire tube in a threaded mode, a second supporting tube limiting the circumferential rotation of the second transmission nut is connected to the second transmission nut, and the second supporting tube is connected with the second outer tube.

8. The self-locking lifting column according to claim 1, characterized in that: the telescopic pipe is a telescopic pipe with a square or round cross section.