CN211082730U

CN211082730U - Linear transmission assembly and lifting table leg applied by same

Info

Publication number: CN211082730U
Application number: CN201921851467.1U
Authority: CN
Inventors: 项乐宏; 蒋领辉; 陶闽泉; 陈罗辉
Original assignee: Zhejiang Lege Intelligent Drive Technology Co ltd
Current assignee: Zhejiang Lege Intelligent Drive Technology Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-07-24
Anticipated expiration: 2029-10-30

Abstract

The utility model discloses a linear transmission assembly and a lifting desk leg applied by the same, which comprises a transmission pipe; the first wire tube can synchronously rotate with the transmission tube and can relatively slide along the axial direction with the transmission tube to generate displacement, and a first transmission nut is connected to the first wire tube in a threaded manner; the second wire tube rotates synchronously with the first wire tube and slides relatively to the first wire tube to generate displacement, a second transmission nut is connected to the second wire tube in a threaded manner, and a first connecting seat is connected to the second transmission nut; the lead screw is fixedly arranged in the second wire tube, and the outer side wall of the lead screw is in clearance fit with the inner wall of the second wire tube; the screw rod is in threaded connection with a third transmission nut which is connected with the second wire tube; a second connecting seat is sleeved on the third transmission nut, and the third transmission nut is rotatably connected with the second connecting seat and is limited along the axial direction. The linear transmission assembly and the lifting table legs applied by the linear transmission assembly can increase the stroke of the lifting upright post.

Description

Linear transmission assembly and lifting table leg applied by same

Technical Field

The utility model relates to a mechanical transmission technical field, what specifically say is a linear transmission assembly and lift table leg of using thereof.

Background

The lifting table legs in the prior art generally comprise a driving mechanism, an inner pipe, a middle pipe and an outer pipe which are nested with each other and can relatively move and stretch, the upper end of the inner pipe is connected with an outer shell of the driving mechanism, and the lower end of the outer pipe is contacted with the ground; the inner tube is internally provided with a linear transmission assembly, the linear transmission assembly comprises a square supporting tube, a first base is connected in an inner hole at the upper end of the supporting tube, a screw rod is connected in a central hole of the first base in an internal thread mode, and the first base and the supporting tube move along the length direction of the screw rod under the rotation of the screw rod; the supporting tube is in sliding fit with a square tube sleeved on the screw rod, the lower end of the square tube is connected with the lower end of the outer tube through a connecting plate, a second base is connected in an inner hole of the square tube, a wire tube sleeved on the screw rod is connected in a central hole of the second base in a threaded manner, the wire tube and the screw rod rotate synchronously, and the wire tube can slide relative to the screw rod; the driving mechanism drives the screw rod to rotate, so that the supporting tube and the first base move along the axial direction of the screw rod, and meanwhile, the screw tube rotates to enable the square tube and the second base to move along the length direction of the supporting tube, so that the expansion and contraction of the inner tube and the outer tube of the lifting table leg are realized; in order to maximize the stroke of the lifting table leg, the linear transmission assembly is realized by matching two pipe fittings, namely by mutually sleeving the supporting pipe and the square pipe and relatively moving the supporting pipe and the square pipe; however, the linear transmission assembly still far fails to satisfy the requirement of maximizing the stroke of the lifting table leg, and therefore, how to provide a linear transmission assembly capable of maximizing the stroke of the lifting table leg is a technical problem to be solved urgently at present.

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 stroke increase that enables the lift table leg, satisfy the linear transmission assembly of people to lift table leg stroke maximize demand.

The technical solution of the utility model is to provide a have following structure linear transmission assembly: it comprises

The transmission pipe is in transmission connection with the driving mechanism;

the outer side wall of the first wire tube is provided with external threads and is positioned in the transmission tube, the first wire tube can synchronously rotate with the transmission tube, the first wire tube and the transmission tube can relatively slide along the axial direction to generate displacement, and a first transmission nut is connected to the first wire tube in a threaded manner;

the outer side wall of the second wire tube is provided with external threads and is positioned in the first wire tube, the second wire tube can synchronously rotate with the first wire tube, the second wire tube and the first wire tube can relatively slide along the axial direction to generate displacement, a second transmission nut is connected to the second wire tube in a threaded manner, and a first connecting seat capable of limiting the second transmission nut to rotate is connected to the second transmission nut;

the lead screw is fixedly arranged in the second wire tube, and the outer side wall of the lead screw is in clearance fit with the inner wall of the second wire tube; the screw rod is in threaded connection with a third transmission nut, and the third transmission nut is connected with the second wire tube and used for synchronously rotating with the second wire tube; a second connecting seat is sleeved on the third transmission nut, and the third transmission nut is rotatably connected with the second connecting seat and is limited along the axial direction.

Preferably, the outer circumferential wall of the third transmission nut is provided with at least one annular convex wall arranged along the circumferential direction of the third transmission nut, the inner wall of the second connecting seat is provided with an annular groove matched with the annular convex wall, and the annular convex wall is in clearance fit and axially limited in the annular groove.

Preferably, the outer circumferential wall of the third transmission nut is provided with at least one annular groove arranged along the circumferential direction of the third transmission nut, the inner wall of the second connecting seat is provided with an annular convex wall matched with the annular groove, and the annular convex wall is in clearance fit and axially limited in the annular groove.

Preferably, one end of the third transmission nut, which is close to the second wire tube, is provided with a radial protrusion, one end of the second wire tube, which is close to the third transmission nut, is provided with a slot matched with the radial protrusion, and the radial protrusion is inserted into the slot and used for enabling the third transmission nut and the second wire tube to synchronously rotate.

Preferably, the first wire tube is sleeved with a bearing, and the bearing is fixedly connected in the first connecting seat and used for enabling the first wire tube to be rotatably connected with the first connecting seat through the bearing and enabling the first wire tube and the first connecting seat to move synchronously along the axial direction.

Preferably, the inner circumferential walls of the transmission pipe and the first wire pipe are respectively provided with a plurality of sliding grooves which extend along the axial direction of the transmission pipe and are distributed along the circumferential direction of the transmission pipe; the outer side wall of the first wire pipe is sleeved with a first sliding block, the outer circumferential wall of the first sliding block is provided with a radial convex block correspondingly clamped with the sliding groove on the inner circumferential wall of the transmission pipe, and the outer side wall of the radial convex block on the first sliding block is in clearance fit with the inner wall of the sliding groove on the transmission pipe; the outer side wall of the second wire pipe is sleeved with a second sliding block, the outer circumferential wall of the second sliding block is provided with a radial bump correspondingly clamped with the sliding groove on the inner circumferential wall of the first wire pipe, and the outer side wall of the radial bump on the second sliding block is in clearance fit with the inner wall of the sliding groove on the first wire pipe; the outer side wall of the screw rod is sleeved with a third sliding block, and the outer circumferential wall of the third sliding block is in clearance fit with the inner wall of the second wire tube.

Preferably, the first connecting seat comprises a first left connecting seat and a first right connecting seat which are mutually butted, a first jack and a first inserting column are arranged on the butting surface of the first left connecting seat, a second jack and a second inserting column are arranged on the butting surface of the first right connecting seat, after the first left connecting seat and the first right connecting seat are butted, the first inserting column is inserted into the second jack, and the second inserting column is inserted into the first jack; the second connecting seat include the left connecting seat of second and the right connecting seat of second that butt joint each other, be equipped with first jack and first post of inserting on the butt joint face of the left connecting seat of second, be equipped with second jack and second on the butt joint face of the right connecting seat of second and insert the post, the left connecting seat of second and the right connecting seat of second butt joint back, first post and the second jack of inserting are pegged graft, the second is inserted the post and is pegged graft with first jack.

Preferably, an accommodating groove for accommodating the bearing is formed in one end, close to the first wire pipe, of the first connecting seat, the bearing is connected in the accommodating groove, and an inner ring of the bearing is fixedly sleeved on a step surface at the end part of the first wire pipe.

After the structure above adopting, the utility model relates to a linear transmission assembly compares with prior art, has following advantage:

1. the linear transmission assembly consists of a transmission tube, a first wire tube, a second wire tube and a lead screw which are sequentially sleeved from outside to inside, wherein the transmission tube, the first wire tube and the second wire tube can synchronously rotate; therefore, the stroke of the linear transmission assembly is large, in other words, when the transmission tube, the first wire tube, the second wire tube and the lead screw of the linear transmission assembly slide relatively and are completely contracted, the whole length is short, so that the stroke of the linear transmission assembly is large; compared with the linear transmission assembly in the prior art, the length of the linear transmission assembly in the complete contraction process is far smaller than that of the linear transmission assembly in the prior art in the complete contraction process under the condition that the completely expanded heights of the linear transmission assembly are equal; in other words, under the condition that the fully contracted heights of the linear transmission assemblies are equal, the length of the linear transmission assembly when the linear transmission assembly is fully expanded is far longer than that of the linear transmission assembly in the prior art when the linear transmission assembly is fully expanded; therefore, the utility model discloses a linear transmission assembly's stroke is great. The linear transmission assembly can increase the stroke of the lifting table leg and meet the maximum requirement of people on the stroke of the lifting table leg.

2. The driving mechanism drives the transmission pipe to rotate, the transmission pipe drives the first wire pipe and the second wire pipe to synchronously rotate when rotating due to the fact that the lead screw is in a fixed state, the first wire pipe can relatively slide along the axial direction relative to the transmission pipe to generate displacement under the condition that the first transmission nut and the second transmission nut are limited to rotate, the second wire pipe can relatively slide along the axial direction relative to the first wire pipe to generate displacement, the second wire pipe drives the third transmission nut to axially rotate along the lead screw when rotating, and the third transmission nut drives the second connecting seat to axially move while rotating under the condition that the second connecting seat is limited to rotate; so as to realize the telescopic action of the linear transmission assembly; the arrangement makes the actions of the first wire tube relative sliding to the transmission tube, the second wire tube relative sliding to the first wire tube and the second wire tube relative moving to the screw rod more stable and compact, and improves the stability of the action of the linear transmission assembly.

3. The first wire tube is rotatably connected with the first connecting seat through the bearing, and the first wire tube and the first connecting seat can move synchronously along the axial direction, so that the stability of the action of the linear transmission assembly is further improved.

4. The first connecting seat is in butt joint with the first right connecting seat through the first left connecting seat, and the second connecting seat is in butt joint with the second right connecting seat through the second left connecting seat, so that the connection between the first connecting seat and the second transmission nut and the connection between the second connecting seat and the third transmission nut are completed; the installation can be completed without using a manual tool, and the installation efficiency is improved. And the installation between the first connecting seat and the bearing is very convenient.

Another technical solution of the present invention is to provide a lifting table leg, which comprises a first vertical pipe, a second vertical pipe, a third vertical pipe and a fourth vertical pipe, which are sequentially sleeved from inside to outside, a housing fixedly connected to an upper end of the first vertical pipe, a driving mechanism disposed in the housing, and a linear transmission assembly in transmission connection with the driving mechanism, wherein the linear transmission assembly adopts the linear transmission assembly according to any one of the above technical solutions; the driving mechanism is in transmission connection with the transmission pipe, the first transmission nut is connected with the first vertical pipe, the first connecting seat is connected with the second vertical pipe, and the second connecting seat is connected with the third vertical pipe; the lower end of the fourth vertical pipe is fixedly connected with a fixing plate, and the lower end of the lead screw is fixedly connected to the fixing plate.

Preferably, one end of the transmission pipe close to the driving mechanism is fixedly connected with a driving rod with an axis coaxial with the transmission pipe, the driving rod is rotatably connected to the bottom of the shell, and the free end of the driving rod is arranged in the shell and is in transmission connection with the driving mechanism in the shell.

After the structure above the adoption, the utility model discloses lift table leg compares with prior art, has following advantage: the lifting table leg adopts the linear transmission assembly in any technical scheme, so that the stroke of the lifting table leg is increased, and the requirement of people on the maximum stroke of the lifting table leg is met.

Drawings

Fig. 1 is a schematic structural diagram of the linear transmission assembly of the present invention.

Fig. 2 is a schematic cross-sectional view of the linear transmission assembly of the present invention.

Fig. 3 is a schematic view of an assembly structure of the linear transmission assembly of the present invention.

Fig. 4 is a schematic view of another angle assembly structure of the linear transmission assembly of the present invention.

Fig. 5 is a schematic structural view of the elevating table leg of the present invention.

Fig. 6 is a schematic sectional view of the elevating table leg of the present invention.

As shown in the figure:

1. the driving device comprises a driving pipe, 100, a sliding groove, 2, a first wire pipe, 200, a step surface, 201, a first sliding block, 3, a second wire pipe, 300, a second sliding block, 4, a lead screw, 5, a first driving nut, 500, a second driving nut, 501, a third driving nut, 502, an annular convex wall, 6, a first connecting seat, 600, a second connecting seat, 601, a containing groove, 602, an annular groove, 603, a first left connecting seat, 604, a first right connecting seat, 605, a first inserting column, 606, a first inserting hole, 607, a second inserting column, 608, a second inserting hole, 609, a second left connecting seat, 610, a second right connecting seat, 7, a bearing, 8, a first stand pipe, 800, a second stand pipe, 801, a third stand pipe, 802, a fourth stand pipe, 9, a shell, 900, a driving motor, 901, a driving rod, 10 and a fixing plate.

Detailed Description

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

As shown in fig. 1 to 4;

the utility model relates to a linear transmission assembly, also called linear driving mechanism, which is used for being installed in a lifting table leg and driving the inner tube and the outer tube of the lifting table leg to relatively extend and retract, and the structure of the linear transmission assembly comprises a transmission tube 1 which is in transmission connection with the driving mechanism; the driving mechanism comprises a shell 9 and a driving motor 900 arranged in the shell 9; one end of the transmission pipe 1 close to the driving mechanism is fixedly connected with a driving rod 901, the axis of which is coaxial with the transmission pipe 1, the driving rod 901 can be rotatably connected to the bottom of the shell 9, and the free end of the driving rod 901 is arranged in the shell 9 and is in transmission connection with a driving motor 900 in the shell; the inner circumferential wall of the transmission pipe 1 is provided with a plurality of sliding grooves 100 extending along the axial direction and distributed along the circumferential direction.

The outer side wall of the first wire tube 2 is provided with external threads and is positioned in the transmission tube 1, the first wire tube 2 can synchronously rotate with the transmission tube 1, the first wire tube 2 and the transmission tube 1 can relatively slide along the axial direction to generate displacement, and the first transmission nut 5 is connected to the first wire tube 2 in a threaded manner; the inner circumferential wall of the first wire tube 2 is provided with a plurality of sliding chutes 100 which extend along the axial direction and are distributed along the circumferential direction, the outer side wall of the first wire tube 2 is sleeved with a first sliding block 201, the outer circumferential wall of the first sliding block 201 is provided with a radial convex block which is correspondingly clamped with the sliding chutes 100 on the inner circumferential wall of the transmission tube 1, and the outer side wall of the radial convex block on the first sliding block 201 is in clearance fit with the inner wall of the sliding chute 100 on the transmission tube 1; the first wire tube 2 is sleeved with a bearing 7, the bearing 7 is fixedly connected in the first connecting seat 6, and the first wire tube 2 is rotatably connected with the first connecting seat 6 through the bearing 7 and can move synchronously along the axial direction with the first connecting seat 6. The transmission tube 1 rotates to enable the first wire tube 2 to synchronously rotate along with the transmission tube 1, and when the rotation of the first transmission nut 5 is limited, the first wire tube 2 and the transmission tube 1 can relatively slide along the axial direction to generate displacement.

The outer side wall of the second wire tube 3 is provided with external threads and is positioned in the first wire tube 2, the second wire tube 3 can synchronously rotate with the first wire tube 2, the second wire tube 3 and the first wire tube 2 can relatively slide along the axial direction to generate displacement, the second wire tube 3 is in threaded connection with a second transmission nut 500, and the second transmission nut 500 is connected with a first connecting seat 6 capable of limiting the rotation of the second transmission nut 500; the outer side wall of the second wire tube 3 is sleeved with a second sliding block 300, the outer circumferential wall of the second sliding block 300 is provided with a radial convex block correspondingly clamped with the sliding groove 100 on the inner circumferential wall of the first wire tube 2, and the outer side wall of the radial convex block on the second sliding block 300 is in clearance fit with the inner wall of the sliding groove 100 on the first wire tube 2 and used for enabling the second sliding block 300 to slide along the length direction of the first wire tube 2.

The screw rod 4 is fixedly arranged in the second wire tube 3, and the outer side wall of the screw rod 4 is in clearance fit with the inner wall of the second wire tube 3; the screw rod 4 is in threaded connection with a third transmission nut 501, and the third transmission nut 501 is connected with the second wire tube 3 and is used for synchronously rotating with the second wire tube 3; a second connecting seat 600 is sleeved on the third transmission nut 501, and the third transmission nut 501 is rotatably connected with the second connecting seat 600 and is axially limited. One end of the third transmission nut 501 close to the second wire tube 3 is provided with a radial protrusion, one end of the second wire tube 3 close to the third transmission nut 501 is provided with a slot matched with the radial protrusion, and the radial protrusion is inserted in the slot and used for enabling the third transmission nut 501 and the second wire tube 3 to rotate synchronously. The lower end of the screw rod 4 is fixedly connected with a fixing plate 10, the fixing plate 10 enables the screw rod 4 to be fixedly connected, the screw rod 4 is arranged in the second wire tube 3, and the second wire tube 3 can rotate along the circumferential direction of the screw rod and slide axially. Drive mechanism drives transmission pipe 1 and rotates, because lead screw 4 is the immobilized state, drive first silk pipe 2 during transmission pipe 1 rotates, second silk pipe 3 rotates in step, at first transmission nut 5, under second transmission nut 500 is restricted rotatory condition, first silk pipe 2 can produce the displacement for transmission pipe 1 along axial relative slip, second silk pipe 3 can produce the displacement for first silk pipe 1 along axial relative slip, and second silk pipe 3 drives third transmission nut 501 along lead screw axial rotation during rotating, under the circumstances that second connecting seat 600 is restricted rotatory, make third transmission nut 501 drive second connecting seat 600 along axial displacement when rotatory.

Referring to fig. 2, the third driving nut 501 is rotatably connected to the second connecting seat 600 and axially limited, and may have the following embodiments: the outer circumferential wall of the third transmission nut 501 is provided with at least one annular convex wall 502 arranged along the circumferential direction of the third transmission nut 501, the inner wall of the second connecting seat 600 is provided with an annular groove 602 matched with the annular convex wall 502, and the annular convex wall 502 is in clearance fit and axially limited in the annular groove 602. Embodiment two (not shown in the figure): the outer circumferential wall of the third transmission nut is provided with at least one annular groove arranged along the circumferential direction of the third transmission nut, the inner wall of the second connecting seat is provided with an annular convex wall matched with the annular groove, and the annular convex wall is in clearance fit and axially limited in the annular groove.

Referring to fig. 2, a plurality of sliding grooves 100 extending along the axial direction and distributed along the circumferential direction are arranged on the inner circumferential walls of the transmission tube 1 and the first wire tube 2; the outer side wall of the first wire tube 2 is sleeved with a first sliding block 201, the outer circumferential wall of the first sliding block 201 is provided with a radial projection which is correspondingly clamped with the sliding groove 100 on the inner circumferential wall of the transmission tube 1, and the outer side wall of the radial projection on the first sliding block 201 is in clearance fit with the inner wall of the sliding groove 100 on the transmission tube 1; the outer side wall of the second wire tube 2 is sleeved with a second sliding block 201, the outer circumferential wall of the second sliding block 201 is provided with a radial convex block correspondingly clamped with the sliding groove 100 on the inner circumferential wall of the first wire tube 2, and the outer side wall of the radial convex block on the second sliding block 201 is in clearance fit with the inner wall of the sliding groove 100 on the first wire tube 2; the outer side wall of the screw rod 4 is sleeved with a third sliding block 400, and the outer circumferential wall of the third sliding block 400 is in clearance fit with the inner wall of the second wire tube 3.

Referring to fig. 3 and 4, the first connection seat 6 includes a first left connection seat 603 and a first right connection seat 604 that are butted with each other, a first insertion hole 606 and a first insertion column 605 are provided on a butting surface of the first left connection seat 603, a second insertion hole 608 and a second insertion column 607 are provided on a butting surface of the first right connection seat 604, after the first left connection seat 603 and the first right connection seat 604 are butted, the first insertion column 605 is inserted into the second insertion hole 608, and the second insertion column 607 is inserted into the first insertion hole 606. The second connecting seat 600 comprises a second left connecting seat 609 and a second right connecting seat 610 which are mutually butted, a first inserting hole 606 and a first inserting column 605 are arranged on the butting surface of the second left connecting seat 609, a second inserting hole 608 and a second inserting column 607 are arranged on the butting surface of the second right connecting seat 610, after the second left connecting seat 609 and the second right connecting seat 610 are butted, the first inserting column 605 is inserted into the second inserting hole 608, and the second inserting column 607 is inserted into the first inserting hole 606. An accommodating groove 601 for accommodating the bearing 7 is formed in one end, close to the first wire pipe 5, of the first connecting seat 6, the bearing 7 is connected in the accommodating groove 601, and an inner ring of the bearing 7 is fixedly sleeved on the step surface 200 at the end part of the first wire pipe 2. First connecting seat 6 docks through first left connecting seat 603 and first right connecting seat 604 to and second connecting seat 600 docks through second left connecting seat 609 and second right connecting seat 610, set up like this, make the connection between first connecting seat 6 and second drive nut 500, and the connection between second connecting seat 600 and third drive nut 501 is more convenient, need not to use hand tool can accomplish the installation, has improved the installation effectiveness. And the installation between the first connecting seat and the bearing is very convenient.

See fig. 5-6; the utility model relates to a lifting table leg, it includes first riser 8, second riser 800, third riser 801 and fourth riser 802 that suit from inside to outside in proper order, with the shell 9 of first riser 8 upper end fixed connection, set up the actuating mechanism in shell 9 and with the linear transmission assembly of actuating mechanism transmission connection, actuating mechanism be driving motor 900, linear transmission assembly adopt the linear transmission assembly of any above-mentioned technical scheme; the driving mechanism is in transmission connection with the transmission pipe 1, the first transmission nut 5 is connected with the first vertical pipe 8, the first connecting seat 6 is connected with the second vertical pipe 800, and the second connecting seat 600 is connected with the third vertical pipe 801; the lower end of the fourth vertical pipe 802 is fixedly connected with a fixing plate 10, and the lower end of the lead screw 4 is fixedly connected to the fixing plate 10. That is, the center of the fixing plate 10 is provided with a through hole, and the lower end of the lead screw 4 is fixedly connected in the through hole through a screw. One end of the transmission pipe 1 close to the driving mechanism is fixedly connected with a driving rod 901, the axis of which is coaxial with the transmission pipe, the driving rod 901 is rotatably connected to the bottom of the shell 9, and the free end of the driving rod 901 is arranged in the shell 9 and is in transmission connection with the driving mechanism in the shell 9. The rotating shaft of the driving motor is generally in fit transmission with a worm gear and a worm so as to realize transmission connection between the driving motor and the driving rod.

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. A linear drive assembly, characterized by: it comprises

The transmission pipe is in transmission connection with the driving mechanism;

2. A linear drive assembly as set forth in claim 1, wherein: the outer circumferential wall of the third transmission nut is provided with at least one annular convex wall arranged along the circumferential direction of the third transmission nut, the inner wall of the second connecting seat is provided with an annular groove matched with the annular convex wall, and the annular convex wall is in clearance fit and axially limited in the annular groove.

3. A linear drive assembly as set forth in claim 1, wherein: the outer circumferential wall of the third transmission nut is provided with at least one annular groove arranged along the circumferential direction of the third transmission nut, the inner wall of the second connecting seat is provided with an annular convex wall matched with the annular groove, and the annular convex wall is in clearance fit and axially limited in the annular groove.

4. A linear drive assembly as claimed in claim 2 or 3, wherein: the end of the third transmission nut close to the second wire tube is provided with a radial protrusion, the end of the second wire tube close to the third transmission nut is provided with a slot matched with the radial protrusion, and the radial protrusion is inserted in the slot and used for enabling the third transmission nut and the second wire tube to synchronously rotate.

5. A linear drive assembly as set forth in claim 1, wherein: the first wire pipe is sleeved with a bearing, and the bearing is fixedly connected in the first connecting seat and used for enabling the first wire pipe to be rotatably connected with the first connecting seat through the bearing and enabling the first wire pipe and the first connecting seat to move synchronously along the axial direction.

6. A linear drive assembly as set forth in claim 1, wherein: the inner circular peripheral walls of the transmission pipe and the first wire pipe are respectively provided with a plurality of sliding chutes which extend along the axial direction of the transmission pipe and are distributed along the circumferential direction of the transmission pipe; the outer side wall of the first wire pipe is sleeved with a first sliding block, the outer circumferential wall of the first sliding block is provided with a radial convex block correspondingly clamped with the sliding groove on the inner circumferential wall of the transmission pipe, and the outer side wall of the radial convex block on the first sliding block is in clearance fit with the inner wall of the sliding groove on the transmission pipe; the outer side wall of the second wire pipe is sleeved with a second sliding block, the outer circumferential wall of the second sliding block is provided with a radial bump correspondingly clamped with the sliding groove on the inner circumferential wall of the first wire pipe, and the outer side wall of the radial bump on the second sliding block is in clearance fit with the inner wall of the sliding groove on the first wire pipe; the outer side wall of the screw rod is sleeved with a third sliding block, and the outer circumferential wall of the third sliding block is in clearance fit with the inner wall of the second wire tube.

7. A linear drive assembly as set forth in claim 5, wherein: the first connecting seat comprises a first left connecting seat and a first right connecting seat which are mutually butted, a first jack and a first inserting column are arranged on the butting surface of the first left connecting seat, a second jack and a second inserting column are arranged on the butting surface of the first right connecting seat, the first inserting column is spliced with the second jack after the first left connecting seat is butted with the first right connecting seat, and the second inserting column is spliced with the first jack; the second connecting seat include the left connecting seat of second and the right connecting seat of second that butt joint each other, be equipped with first jack and first post of inserting on the butt joint face of the left connecting seat of second, be equipped with second jack and second on the butt joint face of the right connecting seat of second and insert the post, the left connecting seat of second and the right connecting seat of second butt joint back, first post and the second jack of inserting are pegged graft, the second is inserted the post and is pegged graft with first jack.

8. A linear drive assembly as set forth in claim 5, wherein: the first connecting seat is provided with a containing groove for containing a bearing inside one end close to the first wire tube, the bearing is connected in the containing groove, and an inner ring of the bearing is fixedly sleeved on a step surface at the end part of the first wire tube.

9. The utility model provides a lifting table leg, it includes first riser, second riser, third riser and the fourth riser of suit in proper order from inside to outside, with first riser upper end fixed connection's shell, the setting actuating mechanism in the shell and the linear transmission assembly who is connected with the actuating mechanism transmission, its characterized in that: the linear transmission assembly adopts the linear transmission assembly as claimed in any one of the claims 1 to 8; the driving mechanism is in transmission connection with the transmission pipe, the first transmission nut is connected with the first vertical pipe, the first connecting seat is connected with the second vertical pipe, and the second connecting seat is connected with the third vertical pipe; the lower end of the fourth vertical pipe is fixedly connected with a fixing plate, and the lower end of the lead screw is fixedly connected to the fixing plate.

10. A lifting table leg as claimed in claim 9, wherein: the drive pipe is close to the actuating mechanism's one end fixed connection axis and the actuating lever of drive pipe coaxial line, actuating lever rotatable coupling in the bottom of shell, and the free end setting of actuating lever in the shell and with the actuating mechanism transmission connection in the shell.