CN110467127A - A five-section lifting column - Google Patents

Abstract

The invention discloses a kind of five section lifting columns, including lift assembly and five lifting pipes to socket-connect, five lifting pipes are followed successively by the first lifting pipe from inside to outside, second lifting pipe, third lifting pipe, 4th lifting pipe and the 5th lifting pipe, lift assembly is fixed in third lifting pipe, lift assembly includes: upper transmission component, underdrive component and driving assembly, the present invention is moved up or down by the different lifting pipe of five section lifting columns when lifting column starts, five lifting pipes of five section lifting columns being placed on table top are realized visual while being risen, so that the lifting speed of lifting column is more times of the lifting column of single screw component, improve the integral elevating speed of lifting column.

Description

A five-section lifting column

technical field

The invention belongs to the field of lifting columns, in particular to a five-section lifting column.

Background technique

At present, the drive assembly in the existing lifting column realizes the lifting of the lifting column by driving a single screw assembly, which makes the lifting speed of the lifting column too slow, takes too long to lift to the specified height, and has low lifting efficiency. The lifting tube of each section of the lifting column is set long enough to realize lifting to the set height, so that the length of the lifting column in the contracted state is too long, which is not convenient for storage and transportation.

Contents of the invention

The technical problem to be solved by the present invention is to provide a fast lifting five-section lifting column.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical scheme: a five-section lifting column, including a lifting assembly and five lifting tubes that are socketed together, and the five lifting tubes are the first lifting tube, the second The lifting tube, the third lifting tube, the fourth lifting tube and the fifth lifting tube, the lifting assembly is fixed in the third lifting tube, the lifting assembly includes: the upper transmission assembly, including the connected upper transmission inner screw assembly and the upper transmission outer The screw assembly, the inner screw assembly of the upper transmission is connected with the second lifting pipe, and is used to drive the second lifting pipe to rise; the outer screw assembly of the upper transmission is connected with the first lifting pipe, and is used to drive the first lifting pipe to rise; the lower transmission Components, including the connected lower transmission inner screw assembly and the lower transmission outer screw assembly, the lower transmission outer screw assembly is connected with the fourth lifter, used to drive the fourth lifter down, the lower drive inner screw assembly and the fifth The lift pipe is connected to drive the fifth lift pipe to descend; the driving assembly is connected to the upper transmission assembly and the lower transmission assembly respectively, and is used to simultaneously drive the upper transmission assembly and the lower transmission assembly to run.

Further, the upper transmission inner screw assembly includes an upper transmission inner screw connected with the drive assembly and an upper transmission inner nut threadedly connected with the upper transmission inner screw, and the upper transmission inner nut is connected with the second lifting tube.

Further, the upper transmission outer screw assembly includes the upper transmission outer screw and the upper transmission outer nut threadedly connected with the upper transmission outer screw, the upper transmission outer screw is sleeved on the upper transmission inner screw and connected to the upper The moving inner screw rods rotate together, and the upper driving outer nut is connected with the first lifting pipe.

Further, the first lifting tube includes a first tube body and a top plate arranged on the first tube body, and the upper transmission outer nut is connected with the top plate through the upper transmission tube.

Further, the lower drive outer screw assembly includes a lower drive tube connected to the drive assembly, a lower drive outer screw that rotates with the lower drive tube through a spline to push the fourth lifting tube down, and is threadedly connected with the lower drive outer screw The lower transmission outer nut, the lower transmission outer nut is fixed on the third lifting tube.

Further, the lower transmission inner screw assembly includes a lower transmission inner screw connected to the fifth lifting tube and a lower transmission inner nut threadedly connected with the lower transmission inner screw, and the lower transmission outer screw is sleeved on the lower transmission inner screw On the outside, the lower transmission inner nut is fixed on the bottom of the lower transmission outer screw rod and is interlocked with the lower transmission outer screw rod.

Further, the driving assembly includes a motor and a reduction box connected to the upper transmission assembly and the lower transmission assembly.

Further, the reduction box includes a worm gear device connected to the motor, a first transmission device connected to the upper transmission assembly, and a second transmission device connected to the lower transmission assembly, and the second transmission device and the worm gear device are driven by the first transmission device .

Further, the worm gear device includes a worm connected to the motor and a worm gear connected to the worm, and the first transmission device includes a first bevel gear connected to the worm gear, a second bevel gear meshed with the first bevel gear, and a second bevel gear connected to the second bevel gear. The first transmission gear is gear-linked, and the second transmission device includes a second transmission gear meshed with the first transmission gear.

Further, the third lifting pipe includes a third pipe body and a bottom plate arranged at the bottom of the third pipe body, and the reduction box is fixed on the bottom plate.

Compared with prior art, the beneficial effect of the present invention is:

By setting five lifting columns, when the drive assembly drives the upper transmission assembly and the lower transmission assembly at the same time, the upper transmission inner screw assembly and the upper transmission outer screw assembly of the upper transmission assembly push the first lift tube and the second lift tube upward respectively. Away from the third lift tube, the lower drive inner screw assembly and the lower drive outer screw assembly of the lower drive assembly respectively push the fourth lift tube and the fifth lift tube downward away from the third lift tube, the first lift tube and the second lift tube The tube rises relative to the third lift tube, the fourth lift tube and the fifth lift tube descend relative to the third lift tube, and the five lift tubes of the five-section lifting column placed on the table can rise visually at the same time, so that the lifting column The lifting speed of the lifting column is multiple times that of the lifting column of a single screw assembly. When the output speed of the screw assembly is low, the overall lifting speed of the lifting column is increased, and the lifting tubes of the five-section lifting column are different when the lifting column is started. Moving up or down, when the lifting column is in the shrinking state, the five lifting tubes overlap or partially overlap, and each lifting tube can realize the lifting column to the set height without setting too long, that is, to achieve the purpose of low installation distance and high stroke , to facilitate the storage and transportation of the lifting column.

The features and advantages of the present invention will be disclosed in detail in the following specific embodiments and accompanying drawings.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

Fig. 1 is a perspective view of a five-section lifting column of the present invention;

Figure 2 is a schematic diagram of the lifting assembly;

Figure 3 is a schematic diagram of the connection of the gearbox, the upper transmission assembly and the lower transmission assembly;

Figure 4 is a second schematic diagram of the connection of the gearbox, the upper transmission assembly and the lower transmission assembly;

Fig. 5 is a schematic sectional view one of a five-section lifting column invented;

Fig. 6 is a schematic sectional view II of the invention of a five-section lifting column.

Description of drawings:

110, the first lift tube; 120, the second lift tube; 130, the third lift tube; 140, the fourth lift tube; 150, the fifth lift tube;

200, motor;

300, reduction box; 311, worm gear; 312, worm; 321, the first bevel gear; 322, the second bevel gear; 323, the first transmission gear; 331, the second transmission gear;

410, upper transmission inner screw rod; 420, upper transmission inner nut;

510, upper transmission outer screw rod; 520, upper transmission outer nut; 530, upper transmission tube;

610, the inner screw rod of the lower transmission; 620, the inner nut of the lower transmission;

710, the lower transmission outer screw mandrel; 720, the lower transmission outer nut; 730, the lower transmission tube.

810, the first spline; 820, the second spline.

Detailed ways

A five-section elevating column, including an elevating assembly and five elevating pipes socketed together, the five elevating pipes are the first elevating pipe, the second elevating pipe, the third elevating pipe, the fourth elevating pipe and the The fifth lifting tube, the lifting assembly is fixed in the third lifting tube, the lifting assembly includes: the upper transmission assembly, including the connected upper transmission inner screw assembly and the upper transmission outer screw assembly, the upper transmission inner screw assembly and the second The lifting tube is connected to drive the second lifting tube to rise, and the upper transmission outer screw assembly is connected to the first lifting tube to drive the first lifting tube to rise; the lower transmission assembly includes the connected lower transmission inner screw assembly and the lower transmission assembly. The transmission outer screw assembly, the lower transmission outer screw assembly is connected with the fourth lift pipe, and is used to drive the fourth lift pipe to descend, and the lower transmission inner screw assembly is connected with the fifth lift pipe, and is used to drive the fifth lift pipe to descend; The driving assembly is respectively connected with the upper transmission assembly and the lower transmission assembly, and is used to simultaneously drive the upper transmission assembly and the lower transmission assembly to run. In the present invention, by setting up five lifting columns, when the driving assembly drives the upper transmission assembly and the lower transmission assembly at the same time, the upper transmission inner screw assembly and the upper transmission outer screw assembly of the upper transmission assembly push the first lifting tube and the second lifting tube respectively. The pipe moves upward away from the third lift tube, the lower drive inner screw assembly and the lower drive outer screw assembly of the lower drive assembly respectively push the fourth lift tube and the fifth lift tube downward away from the third lift tube, the first lift tube and the second lift tube The second lift tube rises relative to the third lift tube, the fourth lift tube and the fifth lift tube descend relative to the third lift tube, and the five lift tubes of the five-section lifting column placed on the table surface rise simultaneously visually, so that The lifting speed of the lifting column is many times that of the lifting column of a single screw assembly. When the output speed of the screw assembly is low, the overall lifting speed of the lifting column is increased, and the lifting tubes of the five-section lifting column are different in the lifting column. When starting, move up or down. When the lifting column is in the retracted state, the five lifting tubes overlap or partially overlap. Each lifting tube does not need to be set too long to realize the lifting column to the set height, that is, to achieve low installation distance and high stroke. The purpose is to facilitate the storage and transportation of the lifting column.

The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientations or positional relationships indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a reference to this invention. Invention Limitations.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

Embodiment one:

A five-section lifting column, as shown in Figure 1, includes a lifting assembly and five lifting tubes that are socketed, and the five lifting tubes are the first lifting tube 110, the second lifting tube 120, the third Lifting tube 130, fourth lifting tube 140 and fifth lifting tube 150, the lifting assembly is fixed in the third lifting tube 130 and connected with the bottom wall of the third lifting tube 130, the lifting assembly includes an upper transmission assembly and a lower transmission assembly and drive components.

The driving assembly is respectively connected with the upper transmission assembly and the lower transmission assembly, as shown in Fig. 2, Fig. 3 and Fig. 4, and is used to simultaneously drive the upper transmission assembly and the lower transmission assembly to run. In this embodiment, the drive assembly includes a motor 200 that is energized and rotates and a reduction box 300 that drives the upper transmission assembly and the lower transmission assembly. The reduction box 300 includes a worm and gear device connected to the output shaft of the motor 200. The upper worm 312 and the worm gear 311 connected with the worm 312 decelerate the output rotation of the motor 200, and control the speed of the upper transmission assembly and the lower transmission assembly within an appropriate range. The reduction box 300 also includes a first transmission device and a second transmission assembly. Two transmission devices, the second transmission device and the worm gear are driven by the first transmission device, so that the worm gear and worm device can drive the first transmission device and the second transmission device to rotate at the same time only by being connected to the first transmission device, without It is connected with the two at the same time, reducing the volume of the worm gear device. In this embodiment, preferably, the first transmission device includes a first bevel gear 321 keyed to the worm gear 311 , a second bevel gear 322 meshing with the first bevel gear 321 , and a first transmission gear linked with the second bevel gear 322 . Gear 323, the second transmission device includes a second transmission gear 331 meshed with the first transmission gear 323, and the worm gear is combined with the meshed first bevel gear 321 and second bevel gear 322 to output the rotation of the output shaft of the motor 200 The direction is adjusted so that the output shaft of the motor 200 is arranged parallel to the upper transmission assembly and the lower transmission assembly.

In this embodiment, as shown in FIG. 5 and FIG. 6, the upper transmission assembly includes an upper transmission inner screw assembly and an upper transmission outer screw assembly, and the upper transmission inner screw assembly is connected with the second lifting tube 120 for Drive the second lift tube 120 to rise relative to the third lift tube 130 , and the upper drive outer screw assembly is connected to the first lift tube 110 to drive the first lift tube 110 to rise relative to the second lift tube 120 . Wherein, the upper transmission inner screw rod assembly includes the upper transmission inner screw rod 410 whose bottom is inserted on the second bevel gear 322 and rotates with the second bevel gear 322 and the upper transmission inner screw nut 420 which is threadedly connected with the upper transmission inner screw rod 410 , the upper transmission inner nut 420 is fixed on the second lift tube 120, so that when the upper drive inner screw 410 rotates, the upper drive inner nut 420 will axially push the second lift tube 120 connected to the upper drive inner nut 420. The upper drive outer screw assembly includes an upper drive outer screw 510 and an upper drive outer nut 520 threadedly connected with the upper drive outer screw 510. The upper drive outer screw 510 is sleeved on the upper drive inner screw 410. The screw rod 510 rotates together with the upper transmission inner screw rod 410 through the first spline 810 on the top, and the upper transmission outer nut 520 is connected with the first lifting tube 110. Preferably, the first lifting tube 110 includes a first tube body and a device. On the top plate on the first pipe body, the upper transmission outer nut 520 is connected to the top plate through an upper transmission tube 530 , and the upper transmission outer nut 520 is fixed inside the upper transmission tube 530 .

In this embodiment, the lower transmission assembly includes a connected lower transmission inner screw assembly and a lower transmission outer screw assembly, and the lower transmission outer screw assembly is connected with the fourth lifting tube 140 for driving the fourth lifting tube 140 relative to the first The third lifting tube 130 descends, and the lower driving inner screw assembly is connected with the fifth lifting tube 150 to drive the fifth lifting tube 150 to descend relative to the fourth lifting tube 140 . Wherein, the lower transmission outer screw rod assembly includes the lower transmission pipe 730 connected with the second transmission gear 331, the lower transmission outer screw rod 710 which rotates together with the lower transmission pipe 730 to push the fourth lifting tube 140 down, and the lower transmission outer screw rod 710 which is connected with the lower transmission outer wire. Rod 710 is threadedly connected with the lower transmission outer nut 720, and the lower transmission outer nut 720 is fixed on the reduction box 300, that is, the lower transmission outer nut 720 is fixed on the third lifting tube 130, and the lower transmission outer screw rod 710 will rotate along the axis To push the fourth lifting tube 140, the lower transmission outer screw rod 710 can be connected with the bottom wall of the fourth lifting tube 140 through the connecting structure, and the lower driving outer screw rod 710 and the connecting structure are fixed in the axial direction, but can be relatively rotated ( The connection structure can be the structure shown in FIG. 6 , and can also be any structure that realizes this function, such as bearings), so that the lower transmission outer screw rod 710 does not drive the fourth lifting tube 140 to rotate. The lower transmission inner screw assembly includes a lower transmission inner screw 610 connected to the fifth lifting tube 150 and a lower transmission inner nut 620 threadedly connected with the lower transmission inner screw 610, and the lower transmission outer screw 710 is sleeved in the lower transmission Outside the screw mandrel 610, the lower transmission inner nut 620 is fixed on the bottom of the lower transmission outer screw mandrel 710 and is linked with the lower transmission outer screw mandrel 710. Preferably, the top of the lower transmission tube 730 and the lower transmission outer screw mandrel 710 passes through the second The spline 820 drives, and the inner screw rod 610 of the lower transmission can be connected with the bottom wall of the fifth lifting tube 150 through the connection structure, and the inner screw rod 610 of the lower transmission and the connection structure are fixed in the axial direction, but can be relatively rotated (the connection structure can It is the structure shown in FIG. 6 , and can also be any structure that realizes this function, such as bearings), so that the lower transmission inner screw rod 610 does not drive the fifth lifting tube 150 to rotate.

The working process of the lifting column is as follows:

The rotation of the output shaft of the motor 200 drives the worm screw 312 to rotate, and the worm screw 312 drives the worm gear 311 to rotate to reduce the speed. The gear 322 drives the upper transmission inner screw 410 to rotate coaxially, and the rotation of the upper transmission inner screw 410 drives the upper transmission inner nut 420 to move axially along the upper transmission inner screw 410, and the upper transmission inner nut 420 drives the second lifting tube 120 moves to the top of the third lifting tube 130, and pushes the upper transmission outer screw rod 510 upwards, while the upper transmission inner screw rod 410 rotates, the upper transmission outer screw rod 510 rotates together with the upper transmission inner screw rod 410, driving the upper transmission The outer nut 520 moves axially along the upper drive outer screw rod 510, and the upper drive outer nut 520 pushes the first lift tube 110 upward through the upper drive tube 530, so that the first lift tube 110 moves upward relative to the second lift tube 120 .

While the second bevel gear 322 drives the upper transmission inner screw 410 to rotate, the second bevel gear 322 also drives the first transmission gear 323 that rotates coaxially with the second bevel gear 322 to rotate, and the first transmission gear 323 drives the first transmission gear 323 to rotate with the first The second transmission gear 331 engaged by the transmission gear 323 rotates, the second transmission gear 331 drives the lower transmission tube 730 to rotate, and the lower rotation tube drives the lower transmission outer screw rod 710 to rotate through the second spline 820, because the lower transmission outer nut 720 is fixed on The third lift tube 130 does not move up and down, so the lower drive outer screw 710 pushes the bottom wall of the fourth lift tube 140 in the axial direction, so that the fourth lift tube 140 moves below the third lift tube 130; While the screw rod 710 rotates, the lower drive inner nut 620 fixed on the bottom of the lower drive outer screw rod 710 rotates together with the lower drive outer screw rod 710 and descends, so that the lower drive inner screw rod 610 pushes the fifth lifting tube 150 in the axial direction, The fifth lifting tube 150 is moved to the bottom of the fourth lifting tube 140 .

When the fifth lifting tube 150 is arranged on the platform, visually, the first lifting tube 110 , the second lifting tube 120 , the third lifting tube 130 and the fourth lifting tube 140 move upward simultaneously.

By setting up the five-section lifting column, when the driving assembly drives the upper transmission assembly and the lower transmission assembly at the same time, the upper transmission inner screw assembly and the upper transmission outer screw assembly of the upper transmission assembly respectively push the first lifting tube 110 and the second lifting tube 120 moves upwards away from the third lifting tube 130, the lower transmission inner screw assembly and the lower driving outer screw assembly of the lower transmission assembly respectively push the fourth lifting tube 140 and the fifth lifting tube 150 downwards away from the third lifting tube 130, the first The lift tube 110 and the second lift tube 120 rise relative to the third lift tube 130, and the fourth lift tube 140 and the fifth lift tube 150 descend relative to the third lift tube 130. The lifting tube realizes visual simultaneous rise, so that the lifting speed of the lifting column is multiple times that of the lifting column of a single screw assembly. When the output speed of the screw assembly is low, the overall lifting speed of the lifting column is increased, and five The different lifting tubes of the lifting column move up or down when the lifting column is started. When the lifting column is in the contracted state, the five lifting tubes overlap or partially overlap. Each lifting tube does not need to be set too long. Fixed height, that is, to achieve the purpose of low installation distance and high stroke, which is convenient for storage and transportation of lifting columns.

The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. A five-section lifting column is characterized in that it comprises a lifting assembly and five lifting tubes that are socketed, and the five lifting tubes are successively the first lifting tube, the second lifting tube, the third lifting tube from the inside to the outside. The lifting tube, the fourth lifting tube and the fifth lifting tube, the lifting assembly is fixed in the third lifting tube, and the lifting assembly includes: The upper transmission assembly includes a connected upper transmission inner screw assembly and an upper transmission outer screw assembly. The upper transmission inner screw assembly is connected with the second lift pipe and is used to drive the second lift pipe to rise. The upper drive outer screw assembly The screw assembly is connected with the first lifting pipe, and is used to drive the first lifting pipe to rise; The lower transmission assembly includes a connected lower transmission inner screw assembly and a lower transmission outer screw assembly. The lower transmission outer screw assembly is connected with the fourth lifter for driving the fourth lifter down. The lower drive inner The screw assembly is connected with the fifth lifting pipe, and is used to drive the fifth lifting pipe to descend; The driving assembly is respectively connected with the upper transmission assembly and the lower transmission assembly, and is used to simultaneously drive the upper transmission assembly and the lower transmission assembly to run. 2. A five-section lifting column according to claim 1, characterized in that: the upper drive inner screw assembly includes an upper drive inner screw connected to the drive assembly and an upper drive screw threaded with the upper drive inner screw. The inner nut is moved, and the upper transmission inner nut is connected with the second lifting pipe. 3. A five-section lifting column according to claim 2, characterized in that: the upper drive outer screw assembly includes an upper drive outer screw and an upper drive outer nut threadedly connected with the upper drive outer screw, the The upper transmission outer screw rod is sleeved on the upper transmission inner screw rod and rotates together with the upper transmission inner screw rod through a spline, and the upper transmission outer nut is connected with the first lifting pipe. 4. A five-section lifting column according to claim 3, characterized in that: the first lifting tube includes a first tube body and a top plate arranged on the first tube body, and the upper transmission outer nut is uploaded The moving tube is connected to the top plate. 5. A five-section lifting column according to claim 1, characterized in that: the lower drive outer screw assembly includes a lower drive tube connected to the drive component, and rotates with the lower drive tube through splines to push the first The lower transmission outer screw rod descended by the four lifters and the lower transmission outer nut threadedly connected with the lower transmission outer screw rod, and the lower transmission outer nut is fixed on the third lifter tube. 6. A five-section lifting column according to claim 5, characterized in that: the lower driving inner screw assembly includes a lower driving inner screw connected to the fifth lifting tube and a screw threaded with the lower driving inner screw The connected lower transmission inner nut, the lower transmission outer screw rod is sleeved on the outer side of the lower transmission inner screw rod, and the lower transmission inner nut is fixed on the bottom of the lower transmission outer screw rod and interlocked with the lower transmission outer screw rod. 7. A five-section lifting column according to claim 1, wherein the driving assembly includes a motor and a reduction box connected to the upper transmission assembly and the lower transmission assembly. 8. A five-section lifting column according to claim 7, characterized in that: the reduction box includes a worm gear device connected with the motor, a first transmission device connected with the upper transmission assembly, and a first transmission device connected with the lower transmission assembly. The second transmission device, the second transmission device and the worm gear device are driven by the first transmission device. 9. A five-section lifting column according to claim 8, characterized in that: the worm gear device includes a worm connected to the motor and a worm wheel connected to the worm, and the first transmission device includes a worm wheel connected to the worm wheel The first bevel gear, the second bevel gear meshed with the first bevel gear, and the first transmission gear interlocked with the second bevel gear, the second transmission device includes a second transmission gear meshed with the first transmission gear. 10. A five-section lifting column according to claim 7, characterized in that: the third lifting pipe includes a third pipe body and a bottom plate arranged at the bottom of the third pipe body, and the reduction box is fixed on the bottom plate .