CN218185751U - Lifting table screw rod assembly and lifting upright post - Google Patents

Abstract

The utility model discloses a lifting table screw rod assembly and a lifting upright post, wherein the screw rod assembly comprises a bearing seat, a transmission seat, a bearing, a screw rod and a torsional spring; the bearing seat is provided with a bearing hole for mounting a bearing, the bearing seat is provided with an accommodating groove for accommodating the transmission seat, the torsion spring is positioned in the accommodating groove and tightly holds the transmission seat, and one torsion spring arm is inserted on the bearing seat; the bearing seals the lower part of the accommodating groove and separates the torsion spring from the screw rod; the lifting upright column comprises a motor box, a telescopic pipe fitting and the screw rod assembly; the motor box comprises a bottom plate, wherein a mounting hole is formed in the bottom plate, and the bearing seat is arranged in the mounting hole; the telescopic pipe fitting is arranged below the bottom plate, the screw rod is arranged in the telescopic pipe fitting, a transmission part is arranged in the telescopic pipe fitting, and the transmission part is in threaded connection with the screw rod; a motor is arranged in the motor box and is in transmission connection with the transmission seat, and the motor drives the transmission part and drives the screw rod to rotate so as to stretch the telescopic pipe fitting; the torsion spring is used for preventing the telescopic pipe fitting from shortening when the motor does not work.

Description

Lifting table screw rod assembly and lifting upright post

Technical Field

The utility model relates to a lift table field, in particular to lift table lead screw assembly and lift stand.

Background

In the lifting table, the most central one is the lifting upright post which is driven by the motor to stretch and retract so as to lift the table top and bear all loads of the lifting table, but when more articles are placed on the table top and the overall weight of the table top is increased, the lifting upright post is difficult to ensure not to be shortened, the height of the table top is difficult to maintain, and normal use and user experience are seriously influenced; therefore, the upright column is often required to have self-locking capability, and the self-locking of the upright column can be realized from multiple aspects, such as self-locking of a motor, self-locking of a screw rod and the like, while the most common method is to utilize a torsion spring to self-lock the screw rod, and generally, the self-locking is increased only when the upright column is automatically shortened; under the normal working state of the motor, the output of the motor can resist the torsion spring, so that the upright post can be lifted; when the motor does not work, the torsion spring can tightly hold the friction seat on the screw rod, so that the stand column is prevented from being shortened, and the desktop is prevented from descending.

When the friction seat is a single part or an assembly formed by combining two parts, the problems of installation position, positioning and the like of the friction seat need to be considered, the integrity is poor, abnormal sound is easily generated between the friction seat and a torsion spring or other parts, and the experience is effective; moreover, the traditional torsion spring is exposed, the grease applied between the torsion spring and the friction seat is easy to run off, and the grease is infiltrated and crossed with the grease of the screw rod, so that the abrasion between the torsion spring and the friction seat is increased, the friction force of the torsion spring is attenuated, and the service life is greatly reduced, for example, the actuator disclosed in the Chinese patent invention CN 200380102144.8.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a lift table lead screw assembly, the torsional spring is installed on the transmission seat, sets up in the storage tank of bearing frame along with the transmission seat, and the bearing setting seals the storage tank below in the dead eye of storage tank below to separate torsional spring and lead screw mutually, when realizing the self-locking of torsional spring, also can prevent the loss of torsional spring grease.

And the lifting column is installed on a bottom plate of the motor box, the lifting column is lifted through matching with a transmission piece in the telescopic pipe fitting, and meanwhile, the torsion spring can provide self-locking force for the lifting column and keep the lifting column in the current state under the condition that the motor does not work.

The technical scheme of the utility model is realized like this:

a lifting table screw rod assembly comprises a bearing seat, a transmission seat, a bearing, a screw rod and a torsion spring; the bearing seat is provided with a bearing hole for mounting a bearing, the bearing seat is also provided with an accommodating groove, the transmission seat is positioned in the accommodating groove, the torsion spring is also arranged in the accommodating groove and sleeved on the transmission seat, the torsion spring tightly holds the transmission seat, and one torsion spring arm of the torsion spring is inserted on the bearing seat; the bearing hole is communicated with the accommodating groove, and the bearing seals the lower part of the accommodating groove and separates the torsion spring from the screw rod; the upper end part of the screw rod is inserted in the bearing and the transmission seat; when the screw rod and the transmission seat rotate towards one direction, the torsion spring radially expands, and the screw rod and the transmission seat can rotate without resistance; when the screw rod rotates towards the other direction, the torsion spring contracts in the radial direction and tightly holds the transmission seat, and the rotation resistance of the screw rod and the transmission seat is increased. The torsion spring is matched with the transmission seat, so that self-locking capability in a certain direction is provided for the lifting table screw rod assembly, and the problems of friction noise and the like of the traditional torsion spring and the friction seat are reduced; the torsion spring is arranged in the cavity closed at the lower part and is separated from the screw rod at the lower part, so that the grease of the torsion spring can be fully stored, the grease of the torsion spring cannot be lost, meanwhile, the transmission seat can also approximately cover the accommodating groove from the upper part, and only part of gaps exist in the cavity where the torsion spring is arranged; the problems that grease lubrication between the exposed torsion spring and the friction seat is insufficient, the friction force of the torsion spring is attenuated due to the fact that the exposed torsion spring is mixed with the grease of the screw rod and the grease is dried up are solved, and the service life of the friction mechanism is greatly prolonged; the torsion spring is sleeved on the transmission seat after being unfolded, so that the torsion spring tightly holds the transmission seat.

Preferably, a sealing bearing is arranged on the transmission seat above the torsion spring, and the sealing bearing is arranged in the accommodating groove and seals the upper part of the accommodating groove. The transmission seat is additionally provided with a sealing bearing which is matched with the bearing positioned below the accommodating groove to seal the torsion spring in the accommodating groove from the upper direction and the lower direction, so that the problem of grease loss of the torsion spring is further solved.

Preferably, a limiting groove for accommodating the torsion spring arm is formed in the transmission seat beside the accommodating groove from top to bottom. After the torsion spring arm enters the limiting groove, the torsion spring arm is limited by the limiting groove to rotate, and the torsion spring cannot integrally rotate.

Preferably, the transmission seat comprises a disk-shaped main body part and a cylindrical friction part protruding downwards from the main body part, the torsion spring is sleeved on the friction part, a torsion spring arm inserted on the bearing seat on the torsion spring is a limiting arm, and the limiting arm radially protrudes out of the torsion spring; the limiting arm enters the limiting groove from top to bottom and is limited by the limiting groove to rotate. After the limiting arm enters the limiting groove, when the screw rod and the transmission seat rotate towards the spiral direction taking the limiting arm as an end point, the torsion spring expands on the friction part, the friction force between the torsion spring and the friction part is small, and the influence on the rotation of the screw rod is small; however, when the screw rod and the transmission seat rotate in the spiral direction with the limiting arm as the starting point, the torsion spring can be further contracted on the friction part, the pressure between the torsion spring and the friction part is increased, and meanwhile, the friction force between the torsion spring and the friction part is increased, so that the screw rod is prevented from moving in the direction.

Preferably, the diameter of the body portion is larger than the diameter of the accommodating groove, and the diameter of the friction portion is smaller than the diameter of the accommodating groove. When the friction part enters the containing groove, the main body part is still positioned above the containing groove and covers the containing groove in a virtual covering mode, so that the torsion spring is positioned in a relatively closed cavity.

Preferably, the lower end of the friction portion abuts against the bearing inner race. After the lower end of the friction part is abutted to the inner ring of the bearing, the screw rod positioned in the bearing and the transmission seat is separated from the torsion spring positioned in the accommodating groove.

Preferably, the accommodating groove is formed in the bearing seat from top to bottom, the bearing hole is formed in the bearing seat from bottom to top, the convex ring is arranged between the accommodating groove and the bearing hole, the bearing is installed behind the bearing hole, and the outer ring of the bearing is abutted to the convex ring. The effect of bulge loop can provide spacing for the bearing to confirm whether the bearing installation targets in place, can separate storage tank and mounting hole again behind the installation bearing, prevent that the torsional spring grease from directly outwards oozing to the mounting hole from the storage tank.

A lifting column comprising a motor housing, a telescoping tube, and a lifting desk screw assembly as claimed in any one of claims 1 to 7; the motor box comprises a bottom plate, a bearing seat and a connecting block, wherein the bottom plate is provided with a mounting hole, the bearing seat comprises a mounting plate, a connecting block and a bearing mounting part, the connecting block is arranged in the mounting hole, the mounting plate is positioned above the bottom plate and fixedly connected with the bottom plate through screws, and the bearing mounting part is positioned below the bottom plate; the telescopic pipe fitting is arranged on the bottom plate and is positioned below the motor box, the screw rod is arranged in the telescopic pipe fitting, a transmission piece for driving the telescopic pipe fitting to stretch is arranged in the telescopic pipe fitting, and the transmission piece is in threaded connection with the screw rod; a motor is arranged in the motor box and is in transmission connection with the transmission seat, and the motor drives the transmission part and drives the screw rod to rotate so as to enable the telescopic pipe fitting to stretch; the torsion spring is configured to prevent the telescoping tube from shortening when the motor does not drive the lead screw to rotate. The lifting function of the lifting upright post is realized, meanwhile, the existence of the torsional spring provides self-locking force for the lifting upright post when the lifting upright post descends, and under the condition that the motor does not work, the lifting upright post is prevented from descending by itself, and the state of the lifting upright post at the moment is kept.

Preferably, the telescopic pipe fitting comprises an inner pipe and an outer pipe, the upper end of the outer pipe is fixedly connected with the bottom plate, and the inner pipe is arranged in the outer pipe in a sliding manner; the transmission part is a nut which is fixedly arranged at the upper end part of the inner pipe. The inner pipe and the outer pipe are formed in an inverted mode, and a nut can be directly installed on the upper portion of the inner pipe, so that the screw rod jacks up the outer pipe when rotating.

Preferably, the telescopic pipe fitting comprises an inner pipe and an outer pipe, the upper end of the inner pipe is fixedly connected with the bottom plate, and the outer pipe is sleeved on the inner pipe and is in sliding fit with the inner pipe; the transmission part comprises a sleeve and a nut, the nut is installed at the upper end of the sleeve, and the lower end of the sleeve is fixedly connected with the outer pipe. The inner pipe and the outer pipe are in a normal installation mode, and need to be connected and supported by a sleeve.

Adopted above-mentioned technical scheme the utility model discloses a design departure point, theory and beneficial effect are:

1. the torsion spring is matched with the transmission seat, so that self-locking capability in a certain direction is provided for the lifting table screw rod assembly, and the problems of friction noise and the like of the traditional torsion spring and the friction seat are reduced; the torsion spring is arranged in the cavity closed at the lower part and is separated from the screw rod at the lower part, so that the grease of the torsion spring can be fully stored, the grease of the torsion spring cannot be lost, meanwhile, the transmission seat can also approximately cover the accommodating groove from the upper part, and the cavity in which the torsion spring is arranged has only partial gaps; the problems that grease lubrication between the exposed torsion spring and the friction seat is insufficient, the friction force of the torsion spring is attenuated due to the fact that the exposed torsion spring is mixed with the grease of the screw rod and the grease is dried up are solved, and the service life of the friction mechanism is greatly prolonged; the torsion spring is sleeved on the transmission seat after being unfolded, so that the torsion spring tightly holds the transmission seat; the lifting function of the lifting upright post is realized, meanwhile, the existence of the torsional spring provides self-locking force for the lifting upright post when the lifting upright post descends, and under the condition that the motor does not work, the lifting upright post is prevented from descending by itself, and the state of the lifting upright post at the moment is kept.

2. The transmission seat is additionally provided with a sealing bearing which is matched with a bearing positioned below the accommodating groove, and the torsion spring is sealed in the accommodating groove from the upper direction and the lower direction, so that the problem of grease loss of the torsion spring is further solved.

Drawings

Fig. 1 is an exploded view of a lifting table screw assembly according to an embodiment of the present invention;

fig. 2 is a schematic perspective view of a lifting column according to an embodiment of the present invention;

fig. 3 is a first cross-sectional view of the lifting column according to the embodiment of the present invention;

fig. 4 is a second cross-sectional view of the lifting column in the embodiment of the present invention;

fig. 5 is a schematic perspective view of the embodiment of the present invention in which the torsion spring is mounted on the transmission seat;

fig. 6 is a schematic perspective view of a bearing seat according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of a bearing seat according to an embodiment of the present invention;

fig. 8 is a schematic perspective view illustrating a structure in which the bearing is installed in the bearing seat and the lead screw is inserted into the bearing according to the embodiment of the present invention.

The figures are numbered: a bearing housing 1; a mounting plate 101; a connection block 102; a bearing mounting portion 103; a transmission seat 2; a main body portion 21; a friction portion 22; a connecting portion 23; a bearing 3; a screw rod 4; a torsion spring 5; a bearing hole 6; a containing groove 7; a motor box 8; a bottom plate 81; mounting holes 82; an extension tube 9; an inner tube 91; an end seat 911; a through hole 912; an outer tube 92; a nut 10; a limiting groove 11; a spacing arm 12; a convex ring 13.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The utility model discloses a specific embodiment as follows:

as shown in fig. 1, 3 and 4, the utility model provides a lifting table screw rod 4 assembly, which comprises a bearing seat 1, a transmission seat 2, a bearing 3, a screw rod 4 and a torsion spring 5; the bearing seat 1 is provided with a bearing hole 6 for mounting the bearing 3, the bearing seat 1 is also provided with a containing groove 7, the transmission seat 2 is positioned in the containing groove 7, the torsion spring 5 is also arranged in the containing groove 7 and sleeved on the transmission seat 2, the torsion spring 5 tightly holds the transmission seat 2, and one torsion spring arm of the torsion spring 5 is inserted on the bearing seat 1; the bearing hole 6 is communicated with the accommodating groove 7, the bearing 3 seals the lower part of the accommodating groove 7 and separates the torsion spring 5 from the screw rod 4; the upper end part of the screw rod 4 is inserted in the bearing 3 and the transmission seat 2; when the screw rod 4 and the transmission seat 2 rotate towards one direction, the torsion spring 5 radially expands, and the screw rod 4 and the transmission seat 2 can rotate; when the screw rod 4 rotates towards the other direction, the torsion spring 5 contracts radially and prevents the screw rod 4 and the transmission seat 2 from rotating.

In the traditional lifting table screw rod 4 assembly, the torsion spring 5 is also used for realizing the self-locking function, however, the torsion spring 5 is generally sleeved on an independent friction seat which is arranged between rotating pieces at the end part of the screw rod 4, and in the embodiment, the transmission seat 2 comprises a disc-shaped main body part 21 and a cylindrical friction part 22 which protrudes downwards from the main body part 21, compared with the prior art, the transmission seat 2 and the friction seat are integrated, so that the installation is simplified, and the abnormal sound of the traditional torsion spring 5 and the friction seat can be reduced; moreover, the conventional torsion spring 5 is often exposed outside, which is not visible to the naked eye, but refers to a situation where the torsion spring 5 and the lead screw 4 are present in the inner space of the upright column together, or the grease of the torsion spring 5 runs off, in this embodiment, the bearing 3 is located below the torsion spring 5 to seal the opening below the accommodating groove 7, and separate the lead screw 4 from the torsion spring 5; the grease of the torsion spring can be fully stored, the grease of the torsion spring cannot be lost, meanwhile, the transmission seat 2 can also approximately cover the accommodating groove 7 from the upper part, and only part of gaps exist in the cavity where the torsion spring 5 is located; the problems that grease friction between the exposed torsion spring 5 and the friction seat is insufficient in lubrication, the exposed torsion spring is mixed with grease of the screw rod 4, the grease is dried up to cause friction force attenuation of the torsion spring and the like are solved, and therefore the service life of the torsion spring 5 is greatly prolonged; torsional spring 5 is established on transmission seat 2 after strutting, therefore torsional spring 5 holds transmission seat 2 tightly, has the friction between the two all the time, and torsional spring grease can slow down wearing and tearing between the two.

Further, under the condition that the size and the cost are allowed, a sealing bearing (not shown) can be arranged on the friction part 22 above the torsion spring 5, the sealing bearing is arranged in the accommodating groove 7 and seals the upper part of the accommodating groove 7, and the torsion spring 5 is sealed in the accommodating groove 7 from the upper direction and the lower direction together with the bearing 3, so that the problem of grease loss of the torsion spring is further solved; the sealing bearing is positioned below the main body part 21, so that the transmission seat 2 can be in running fit with the bearing seat 1, and the rotation of the transmission seat 2 and the screw rod 4 cannot be influenced. In the present embodiment, only the above-described bearing 3 is used, and no sealed bearing is used, in consideration of size and cost.

As shown in fig. 2 and 4, a lifting column is further provided, which comprises a motor box 8, a telescopic pipe fitting 9 and the lifting desk screw rod 4 assembly; the motor box 8 comprises a bottom plate 81, a mounting hole 82 is formed in the bottom plate 81, the bearing block 1 comprises a mounting plate 101, a connecting block 102 and a bearing mounting portion 103, the connecting block 102 is arranged in the mounting hole 82, the mounting plate 101 is positioned above the bottom plate 81 and fixedly connected with the bottom plate 81 through screws, and the bearing mounting portion 103 is positioned below the bottom plate 81; the telescopic pipe fitting 9 is arranged on the bottom plate 81 and is positioned below the motor box 8, the screw rod 4 is arranged in the telescopic pipe fitting 9, a transmission piece for driving the telescopic pipe fitting 9 to stretch is arranged in the telescopic pipe fitting 9, and the transmission piece is in threaded connection with the screw rod 4; a motor (not shown) is arranged in the motor box 8, the motor is in transmission connection with the transmission seat 2, and the motor drives the transmission part to rotate and drives the screw rod 4 to rotate so as to enable the telescopic pipe fitting 9 to be telescopic; the torsion spring 5 is configured to prevent the telescopic tube 9 from shortening when the motor does not drive the screw 4 to rotate; this scheme has realized the raising and lowering functions of lift stand, and simultaneously, the existence of torsional spring 5 in the 4 assemblies of lift table lead screw provides the self-locking power when descending for the lift stand, under the inoperative condition of motor, prevents that the lift stand from descending by oneself, keeps the state of lift stand this moment.

The screw rod 4 assembly is arranged on the motor box 8 according to the structure, so that the screw rod 4 and an upper pipe fixedly connected to the motor box 8 necessarily move synchronously; generally, the screw rod 4 needs to be matched with a nut 10 to drive the telescopic pipe fitting 9 to stretch when the screw rod 4 rotates; the telescopic pipe 9 comprises an inner pipe 91 and an outer pipe 92, in a normal installation mode, the inner pipe 91 is an upper pipe, and the nut 10 needs to be fixed relative to the outer pipe 92; in the flip-chip form, the outer tube 92 is an upper tube, and the nut 10 needs to be fixed relative to the inner tube 91; in the normal installation mode, the nut 10 cannot be directly and fixedly connected with the outer tube 92, so the transmission member comprises the nut 10 and a sleeve, the nut 10 is fixedly installed at the upper end of the sleeve, and the lower end of the sleeve is fixedly connected with the outer tube 92; in the inverted form, the transmission member is a nut 10, and the nut 10 can be directly mounted on the inner tube 91; in this embodiment, the flip-chip style is selected to save the cost of the parts required for the bushing.

Specifically, an end seat 911 is integrally formed at the upper end of the inner tube 91, a through hole 912 for mounting a nut 10 is formed in the center of the end seat 911, the nut 10 is sleeved on the screw rod 4, and after the nut 10 is mounted in the through hole 912, the screw rod 4 enters the inner tube 91 through the through hole 912; the outer tube 92 is sleeved outside the inner tube 91, the end seat 911 is always positioned in the outer tube 92, and the upper end of the outer tube 92 is welded and fixed with the bottom surface of the bottom plate 81; the bearing 3 is positioned in the bearing hole 6 of the bearing seat 1, the transmission seat 2 is positioned in the accommodating groove 7 of the bearing seat 1, the connecting block 102 of the bearing seat 1 is positioned in the mounting hole 82, the mounting plate 101 is fixedly connected with the bottom plate 81 through screws, and the upper end part of the screw rod 4 is inserted in the bearing 3 and the transmission seat 2; the transmission seat 2 further comprises three columnar connecting parts 23 protruding upwards from the main body part 21, the connecting parts 23 are evenly distributed along the circumferential direction of the main body part 21, and the shaft end of the motor is in plug-in fit with the connecting parts 23 to complete installation.

As shown in fig. 1 and 6-8, two limiting grooves 11 are symmetrically formed in the transmission seat 2 beside the accommodating groove 7, the limiting grooves 11 are formed from top to bottom and are used for accommodating torsion spring arms, in this embodiment, the torsion spring 5 has only one torsion spring arm, the torsion spring arm is a limiting arm 12, the limiting arm 12 radially protrudes out of the torsion spring 5 and is located at the lower part of the torsion spring 5, and when the friction portion 22 of the transmission seat 2 enters the accommodating groove 7, the limiting arm 12 enters the limiting groove 11 from top to bottom and is limited by the limiting groove 11 to rotate, since the torsion spring 5 is spread and then sleeved on the friction portion 22, friction is always formed between the two, and the torsion spring 5 can be driven to rotate when the friction portion 22 rotates; after the limiting arm 12 is limited by the limiting groove, the friction part 22 rotates to enable the torsion spring 5 to expand or lock; specifically, after the limit arm 12 enters the limit groove 11, when the screw rod 4 and the transmission seat 2 rotate in the spiral direction with the limit arm 12 as the terminal point, the torsion spring 5 expands on the friction part 22, the friction force between the torsion spring and the friction part 22 is small, and the influence on the rotation of the screw rod 4 is small; however, when the screw rod 4 and the transmission base 2 rotate in the spiral direction starting from the stopper arm 12, the torsion spring 5 is further contracted at the friction portion 22, increasing the pressure with the friction portion 22 and increasing the friction force therebetween, thereby preventing the screw rod 4 from moving in that direction.

In this embodiment, as shown in fig. 3 and 4, a semi-closed scheme is adopted for the torsion spring 5, specifically, the cross section of the accommodating groove 7 is circular, and is opened on the mounting plate 101 of the transmission seat 2 from top to bottom, the cross section of the bearing hole 6 is circular, and is opened on the bearing mounting portion 103 of the bearing seat 1 from bottom to top, the accommodating groove 7 is communicated with the bearing hole 6, but a convex ring 13 is convexly arranged between the accommodating groove 7 and the bearing hole 6 towards the center, the bearing 3 is installed in the bearing hole 6 from bottom to top, and the outer ring of the bearing 3 is abutted against the convex ring 13; the diameter of the main body part 21 of the transmission seat 2 is larger than that of the accommodating groove 7, the diameter of the friction part 22 of the transmission seat 2 is smaller than that of the accommodating groove 7, after the friction part 22 enters the accommodating groove 7, the main body part 21 is still positioned above the accommodating groove 7 and covers the accommodating groove 7 in a virtual covering mode, the friction part 22 is positioned in the accommodating groove 7, the lower end of the friction part 22 is abutted with the inner ring of the bearing 3, and after the lower end of the friction part 22 is abutted with the inner ring of the bearing 3, the screw rod 4 positioned in the bearing 3 and the transmission seat 2 is separated from the torsion spring 5 positioned in the accommodating groove 7; meanwhile, the convex ring 13 can not only provide limit for the bearing 3 to determine whether the bearing 3 is installed in place, but also separate the accommodating groove 7 from the mounting hole 82 after the bearing 3 is installed, so as to prevent the torsion spring grease from directly seeping from the accommodating groove 7 to the mounting hole 82; although the semi-closed scheme is adopted, the gap between the main body part 21 and the mounting plate 101 is small, the gap is covered above the accommodating groove 7 in a virtual covering mode, the torsion spring 5 is positioned in a relatively closed cavity, the closed effect is good, and grease is not easy to run off and dry.

Claims (10)

1. The utility model provides a lift table lead screw assembly which characterized in that: comprises a bearing seat, a transmission seat, a bearing, a screw rod and a torsion spring; the bearing seat is provided with a bearing hole for mounting a bearing, the bearing seat is also provided with an accommodating groove, the transmission seat is positioned in the accommodating groove, the torsion spring is also arranged in the accommodating groove and sleeved on the transmission seat, the torsion spring tightly holds the transmission seat, and one torsion spring arm of the torsion spring is inserted on the bearing seat; the bearing hole is communicated with the accommodating groove, the bearing seals the lower part of the accommodating groove and separates the torsion spring from the screw rod; the upper end part of the screw rod is inserted in the bearing and the transmission seat; when the screw rod and the transmission seat rotate towards one direction, the torsion spring radially expands, and the screw rod and the transmission seat can rotate without resistance; when the screw rod rotates towards the other direction, the torsion spring contracts in the radial direction and tightly holds the transmission seat, and the rotation resistance of the screw rod and the transmission seat is increased.

2. The elevating desk screw assembly as set forth in claim 1, wherein: and the transmission seat above the torsion spring is provided with a sealing bearing which is arranged in the accommodating groove and seals the upper part of the accommodating groove.

3. The elevating desk screw assembly as set forth in claim 1, wherein: the transmission seat beside the containing groove is provided with a limiting groove used for containing the torsion spring arm from top to bottom.

4. The elevating desk screw assembly as set forth in claim 3, wherein: the transmission seat comprises a disc-shaped main body part and a cylindrical friction part protruding out of the main body part downwards, a torsion spring is sleeved on the friction part, a torsion spring arm inserted on the bearing seat on the torsion spring is a limiting arm, and the limiting arm protrudes out of the torsion spring in the radial direction; the limiting arm enters the limiting groove from top to bottom and is limited by the limiting groove to rotate.

5. The elevating desk screw assembly as set forth in claim 4, wherein: the diameter of the main body part is larger than that of the accommodating groove, and the diameter of the friction part is smaller than that of the accommodating groove.

6. The elevating desk screw assembly as set forth in claim 4, wherein: the lower end of the friction part is abutted with the inner ring of the bearing.

7. The elevating desk screw assembly as set forth in claim 1, wherein: the bearing comprises a bearing seat, a bearing hole, a bearing, a convex ring, a bearing and a bearing cover, wherein the bearing is arranged on the bearing seat from top to bottom, the bearing hole is arranged on the bearing seat from bottom to top, the convex ring is arranged between the bearing and the bearing hole, the bearing is arranged behind the bearing hole, and the outer ring of the bearing is abutted against the convex ring.

8. A lifting upright post is characterized in that: comprising a motor box, a telescopic tube and a lifting desk screw assembly as claimed in any one of claims 1-7; the motor box comprises a bottom plate, a bearing seat and a connecting block, wherein the bottom plate is provided with a mounting hole, the bearing seat comprises a mounting plate, a connecting block and a bearing mounting part, the connecting block is arranged in the mounting hole, the mounting plate is positioned above the bottom plate and fixedly connected with the bottom plate through screws, and the bearing mounting part is positioned below the bottom plate; the telescopic pipe fitting is arranged on the bottom plate and is positioned below the motor box, the screw rod is arranged in the telescopic pipe fitting, a transmission piece for driving the telescopic pipe fitting to stretch is arranged in the telescopic pipe fitting, and the transmission piece is in threaded connection with the screw rod; a motor is arranged in the motor box and is in transmission connection with the transmission seat, and the motor drives the transmission part and drives the screw rod to rotate so as to stretch the telescopic pipe fitting; the torsion spring is configured to prevent the telescoping tube from shortening when the motor does not drive the lead screw to rotate.

9. The lifting column of claim 8, wherein: the telescopic pipe fitting comprises an inner pipe and an outer pipe, the upper end of the outer pipe is fixedly connected with the bottom plate, and the inner pipe is arranged in the outer pipe in a sliding mode; the transmission part is a nut which is fixedly arranged at the upper end part of the inner pipe.

10. The lifting column of claim 9, wherein: the telescopic pipe fitting comprises an inner pipe and an outer pipe, the upper end of the inner pipe is fixedly connected with the bottom plate, and the outer pipe is sleeved on the inner pipe and is in sliding fit with the inner pipe; the transmission part comprises a sleeve and a nut, the nut is installed at the upper end of the sleeve, and the lower end of the sleeve is fixedly connected with the outer pipe.

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