Lifting column

Abstract

The utility model relates to the technical field of lifting columns, and particularly discloses a lifting column which comprises a driving motor, a transmission mechanism, a first nut, a second nut, a first lead screw, a second lead screw, an inner cylinder, an outer cylinder and a middle cylinder. The first nut drives the first screw rod to lift, and the first screw rod drives the inner cylinder to slide relative to the middle cylinder; meanwhile, a second nut drives a second lead screw to ascend and descend, the second lead screw can drive an outer barrel to ascend and descend relative to a middle barrel, so that synchronous stretching or synchronous retraction of an inner barrel and the outer barrel is achieved, when a lifting column is in a retraction state, the structure in the vertical direction is more compact, and a transmission mechanism comprises a first gear, a second gear and a third gear which are sequentially meshed; the first sleeve is used for connecting the first gear and the first nut, the second sleeve is used for connecting the second gear and the second nut, the number of parts is small, the structure is simple, the cost is reduced, and the assembling efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of rising bollard technology, and in particular to a rising bollard. Background Technology

[0002] As a lifting device, rising bollards are widely used in various lifting platforms. Common rising bollards typically consist of nested inner, middle, and outer tubes. A drive mechanism mounted on the bollard causes the inner and outer tubes to slide back and forth relative to the middle tube, thus achieving the lifting function.

[0003] In the prior art, such as the earlier patent application number CN201810522845.5, a lifting column is disclosed, including an inner tube, a middle tube, an outer tube, a first lead screw, a second lead screw, a first nut, a second nut, a drive mechanism, a transmission tube, and a drive motor. The inner tube is sleeved inside the middle tube and can reciprocate along the axial direction of the middle tube. The outer tube is sleeved outside the middle tube and can reciprocate along the axial direction of the middle tube. A middle plate is provided at the bottom end of the middle tube, and the drive mechanism is located on the middle plate. The transmission mechanism specifically includes a worm, a worm wheel, a first bevel gear and a second bevel gear, a transmission tube, and a transmission gear. The worm is located on the motor shaft of the drive motor. In this lifting column, a worm gear meshes with a worm wheel, which is fixed to a first bevel gear via a spline sleeve. The first bevel gear meshes with a second bevel gear, which is connected to a transmission tube. A first nut is connected to the transmission tube and screwed to a first lead screw. The first lead screw is fixedly connected to the inner tube. A connecting shaft is located at the lower end of the transmission tube. Both the second bevel gear and the transmission gear are fitted onto the connecting shaft. The transmission gear is connected to the second nut, which is threaded to the second lead screw. The second lead screw is fixed to the outer tube. This configuration enables the synchronous lifting of the first and second lead screws, thereby allowing the inner and outer tubes to extend or retract synchronously relative to the middle tube. However, this lifting column has an overly complex transmission mechanism with numerous parts, resulting in high production costs and low assembly efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a lifting column that simplifies the transmission mechanism, reduces production costs, and improves assembly efficiency.

[0005] This utility model provides a lifting column, which includes a drive motor, a transmission mechanism driven by the drive motor, a first nut and a second nut driven by the transmission mechanism, a first lead screw threaded to the first nut, a second lead screw threaded to the second nut, an inner cylinder fixedly connected to the first lead screw, an outer cylinder fixedly connected to the second lead screw, and a middle cylinder located between the inner cylinder and the outer cylinder. The outer cylinder is slidably sleeved on the middle cylinder, and the middle cylinder is slidably sleeved on the inner cylinder. The drive motor and the transmission mechanism are both located in the middle cylinder.

[0006] The transmission mechanism includes a first gear fixed to the output shaft of the drive motor, a second gear meshing with the first gear, a third gear meshing with the second gear, a first sleeve fixedly connected to the second gear, and a second sleeve fixedly connected to the third gear. The first sleeve is fixedly connected to the first nut, and the second sleeve is fixedly connected to the second nut.

[0007] As a preferred technical solution for the lifting column, the lifting column further includes a gearbox, in which the first gear, the second gear and the third gear are all encapsulated, the first sleeve and the second sleeve are rotatably inserted through the gearbox, the housing of the drive motor is fixed to the gearbox, and the gearbox is fixedly connected to the middle cylinder.

[0008] As a preferred technical solution for the lifting column, the lifting column further includes a first bearing and a second bearing located on both sides of the second gear, and a third bearing and a fourth bearing located on both sides of the third gear. The first bearing and the second bearing are both sleeved on the first sleeve, and the third bearing and the fourth bearing are both sleeved on the second sleeve. The first bearing, the second bearing, the third bearing and the fourth bearing all abut against the gearbox.

[0009] As a preferred technical solution for the lifting column, the lifting column further includes a cable electrically connected to the drive motor, and a fixing block disposed on the outer cylinder. The fixing block is used to fix the cable to the outer cylinder, and the portion of the cable located between the fixing block and the drive motor is in a spiral shape.

[0010] As a preferred technical solution for the lifting column, the drive motor includes a servo motor and an encoder integrated into the servo motor, and the cable includes a motor cable for connecting the servo motor and an encoder cable for connecting the encoder.

[0011] As a preferred technical solution for the lifting column, the lifting column further includes a first sliding member, which is fixed to the first lead screw and located inside the first sleeve. The first sliding member is slidably connected to the first sleeve, and the first sliding member and the first nut are spaced apart along the axial direction of the first lead screw.

[0012] As a preferred technical solution for the lifting column, the inner cylinder includes a cylinder body located inside the middle cylinder and a top seat located outside the middle cylinder. The top seat is located above both the middle cylinder and the outer cylinder, and the first lead screw is fixedly connected to the top seat.

[0013] The lifting column also includes a first protective cover, which is fixed below the top seat and covers the outer cylinder.

[0014] As a preferred technical solution for the lifting column, the lifting column further includes a plurality of first sliding components. The first sliding component includes a first slide rail fixed to one of the inner cylinder and the middle cylinder, and a first slide table fixed to the other of the inner cylinder and the middle cylinder. The first slide table is slidably disposed on the first slide rail.

[0015] The lifting column also includes several second sliding components. Each second sliding component includes a second slide rail fixed to one of the middle cylinder and the outer cylinder, and a second slide table fixed to the other of the middle cylinder and the outer cylinder. The second slide table is slidably disposed on the second slide rail.

[0016] As a preferred technical solution for the lifting column, the lifting column further includes a first slider disposed on the inner cylinder, the first slider abutting against the middle cylinder and capable of sliding relative to the middle cylinder; and / or,

[0017] The lifting column also includes a second slider disposed in the middle cylinder, the second slider abutting against the inner cylinder and being able to slide relative to the inner cylinder.

[0018] As a preferred embodiment of the lifting column, the lifting column further includes a third slider disposed in the middle cylinder, the third slider abutting against the outer cylinder and capable of sliding relative to the outer cylinder; and / or,

[0019] The lifting column also includes a fourth slider disposed on the outer cylinder, the fourth slider abutting against the middle cylinder and being able to slide relative to the middle cylinder.

[0020] The beneficial effects of this utility model are as follows:

[0021] This utility model provides a lifting column, which includes a drive motor, a transmission mechanism, a first nut, a second nut, a first lead screw, a second lead screw, an inner cylinder, an outer cylinder, and a middle cylinder. When the drive motor rotates, it drives the first nut and the second nut to rotate through the transmission mechanism. The first nut then drives the first lead screw to rise and fall, and the first lead screw causes the inner cylinder to slide relative to the middle cylinder. Simultaneously, the second nut drives the second lead screw to rise and fall, and the second lead screw can also drive the outer cylinder to rise and fall relative to the middle cylinder. This achieves synchronous extension or retraction of the inner and outer cylinders. When the lifting column is in the retracted state, its vertical structure is more compact, and it occupies less space in the vertical direction.

[0022] The transmission mechanism includes a first gear fixed to the output shaft of the drive motor, a second gear meshing with the first gear, a third gear meshing with the second gear, a first sleeve fixedly connected to the second gear, and a second sleeve fixedly connected to the third gear. The first sleeve and a first nut are fixedly connected, and the second sleeve and a second nut are fixedly connected. The transmission structure includes only three gears and two sleeves. Compared to existing technologies, this structure has fewer parts and a simpler structure, which helps reduce costs and improve assembly efficiency. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the lifting column in an embodiment of the present invention;

[0024] Figure 2 This is an exploded view of the lifting column in an embodiment of the present invention. Figure 1 ;

[0025] Figure 3 This is a cross-sectional view of the lifting column in an embodiment of the present invention. Figure 1 ;

[0026] Figure 4 This is a cross-sectional view of the lifting column in an embodiment of the present invention. Figure 2 ;

[0027] Figure 5 This is an exploded view of the lifting column in an embodiment of the present invention. Figure 2 ;

[0028] Figure 6 This is a partial structural diagram of the lifting column in an embodiment of the present utility model;

[0029] Figure 7 This is an exploded view of the lifting column in an embodiment of the present invention. Figure 3 ;

[0030] Figure 8 This is an exploded view of the lifting column in an embodiment of the present invention. Figure 4 .

[0031] In the picture:

[0032] 1. Drive motor; 2. Transmission mechanism; 3. First nut; 4. Second nut; 5. First lead screw; 6. Second lead screw; 7. Inner cylinder; 8. Outer cylinder; 9. Middle cylinder; 10. First bearing; 11. Second bearing; 12. Third bearing; 13. Fourth bearing; 14. Cable; 15. Fixing block; 16. First sliding member; 17. First protective cover; 18. Second protective cover; 19. First slide rail; 20. First slide table; 21. Second slide rail; 22. Second slide table; 23. First slider; 24. Second slider; 25. Third slider; 26. Fourth slider; 27. Gearbox;

[0033] 201. First gear; 202. Second gear; 203. Third gear; 204. First sleeve; 205. Second sleeve;

[0034] 701. Cylinder body; 702. Top seat. Detailed Implementation

[0035] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In existing lifting columns, the worm gear is mounted on the motor shaft of the drive motor, meshing with a worm wheel. The worm wheel is fixed to a first bevel gear via a spline sleeve. The first bevel gear meshes with a second bevel gear, which is connected to a transmission tube. A first nut is connected to the transmission tube and screwed to a first lead screw. The first lead screw is fixedly connected to the inner tube. A connecting shaft is located at the lower end of the transmission tube. The second bevel gear and the transmission gear are both sleeved on the connecting shaft. The transmission gear is connected to the second nut, which is threaded to the second lead screw. The second lead screw is fixed to the outer tube. This configuration enables synchronous lifting of the first and second lead screws, thereby allowing the inner and outer tubes to extend or retract synchronously relative to the middle tube. However, this transmission mechanism has many parts, a complex structure, high production costs, and low assembly efficiency.

[0040] In response, this embodiment provides a rising bollard to solve the above-mentioned problems.

[0041] like Figures 1 to 8 As shown, the lifting column includes a drive motor 1, a transmission mechanism 2, a first nut 3, a second nut 4, a first lead screw 5, a second lead screw 6, an inner cylinder 7, an outer cylinder 8, and a middle cylinder 9. The drive motor 1 is connected to the transmission mechanism 2, which is connected to the first nut 3 and the second nut 4. The first nut 3 is threaded to the first lead screw 5, and the second nut 4 is threaded to the second lead screw 6. The first lead screw 5 is fixedly connected to the inner cylinder 7, and the second lead screw 6 is fixedly connected to the outer cylinder 8. The outer cylinder 8, the middle cylinder 9, and the inner cylinder 7 are sequentially sleeved, and both the outer cylinder 8 and the inner cylinder 7 can slide relative to the middle cylinder 9. Both the drive motor 1 and the transmission mechanism 2 are located in the middle cylinder 9. When the drive motor 1 rotates, it drives the first nut 3 and the second nut 4 to rotate through the transmission mechanism 2. The first nut 3 then drives the first lead screw 5 to rise and fall, and the first lead screw 5 drives the inner cylinder 7 to slide relative to the middle cylinder 9. At the same time, the second nut 4 drives the second lead screw 6 to rise and fall, and the second lead screw 6 can drive the outer cylinder 8 to rise and fall relative to the middle cylinder 9, thereby achieving synchronous movement of the inner cylinder 7 and the outer cylinder 8.

[0042] The bottom end of the inner cylinder 7 is used to fix it to the ground or the mounting base, and the top end of the outer cylinder 8 is used to connect the load. In this embodiment, the inner cylinder 7 and the outer cylinder 8 move in opposite directions relative to the middle cylinder 9, so as to facilitate the rapid extension and retraction of the lifting column. When the lifting column is in the retracted state, it can make the structure of the lifting column more compact in the vertical direction, which is beneficial to reduce the space occupied in the vertical direction.

[0043] like Figures 3 to 5As shown, the transmission mechanism 2 includes a first gear 201 fixed to the output shaft of the drive motor 1, a second gear 202 meshing with the first gear 201, a third gear 203 meshing with the second gear 202, a first sleeve 204 fixedly connected to the second gear 202, and a second sleeve 205 fixedly connected to the third gear 203. The first sleeve 204 is fixedly connected to the first nut 3, and the second sleeve 205 is fixedly connected to the second nut 4. The transmission structure includes only three gears and two sleeves. Compared with the prior art, the transmission structure has fewer parts and a simpler structure, which is beneficial for reducing costs and improving assembly efficiency.

[0044] Alternatively, please continue to refer to Figures 3 to 5 The lifting column also includes a gearbox 27, in which the first gear 201, the second gear 202, and the third gear 203 are all encapsulated. The first sleeve 204 and the second sleeve 205 are rotatably inserted through the gearbox 27. The housing of the drive motor 1 is fixed to the gearbox 27, and the gearbox 27 is fixedly connected to the middle cylinder 9. This arrangement creates a sealed environment through the gearbox 27, sealing the internal first gear 201, second gear 202, and third gear 203. Furthermore, the gearbox 27 can be filled with solid grease to prevent external debris from entering. In this embodiment, the bottom of the gearbox 27 is fixedly connected to the bottom of the middle cylinder 9, and the bottom of the inner cylinder 7 is located above the bottom of the gearbox 27, thus allowing the gearbox 27 to be fixed to the middle cylinder 9.

[0045] Alternatively, please refer to Figure 3 The lifting column also includes a first bearing 10 and a second bearing 11 located on both sides of the second gear 202, and a third bearing 12 and a fourth bearing 13 located on both sides of the third gear 203. The first bearing 10 and the second bearing 11 are both sleeved on the first sleeve 204, and the third bearing 12 and the fourth bearing 13 are both sleeved on the second sleeve 205. All four bearings abut against the gearbox 27. This arrangement allows the gearbox 27 to support the four bearings, effectively increasing their load-bearing capacity.

[0046] Since the drive motor 1 is fixed to the middle cylinder 9, and the bottom of the inner cylinder 7 is used to fix it to the mounting base, and the middle cylinder 9 will rise and fall relative to the inner cylinder 7, thus the motor will also rise and fall accordingly. This necessitates that the cable 14 connected to the motor needs to have a certain amount of slack in the vertical space. For this, please refer to... Figures 5 to 7The lifting column also includes a cable 14 electrically connected to the drive motor 1, and a fixing block 15 disposed on the outer cylinder 8. The fixing block 15 is used to fix the cable 14 to the outer cylinder 8. The part of the cable 14 between the fixing block 15 and the drive motor 1 is in the shape of a spiral. With this arrangement, the cable 14 can be stretched or retracted in the vertical direction, which can meet the needs of the drive motor 1 when lifting. In addition, the part of the cable 14 inside the inner cylinder 7 is simple and beautiful.

[0047] Optionally, the drive motor 1 includes a servo motor and an encoder integrated into the servo motor, and the cable 14 includes a motor cable for connecting the servo motor and an encoder cable for connecting the encoder. Using a servo motor ensures higher control precision and reliable lifting position, while also offering faster speed and response. Furthermore, integrating the motor cable and encoder cable simplifies the types and number of cables 14, making wiring convenient, aesthetically pleasing, and space-saving. Further, the motor cable and encoder cable are housed within the same insulating sleeve, with the motor cable having an outer metal foil and the encoder cable having an outer second metal foil, ensuring no electromagnetic interference occurs between them.

[0048] Optionally, such as Figure 3 and Figure 4 As shown, the lifting column also includes a first sliding member 16, which is fixed to the first lead screw 5 and located inside the first sleeve 204. The first sliding member 16 is slidably connected to the first sleeve 204, and the first sliding member 16 and the first nut 3 are spaced apart along the axial direction of the first lead screw 5. Specifically, when the lifting column retracts, the first sliding member 16 and the first nut 3 are located at the two ends of the first lead screw 5, respectively. The first sliding member 16, in conjunction with the first nut 3, ensures the stable lifting and lowering of the first lead screw 5, preventing swaying during the lifting process. The first sliding member 16 can be made of a self-lubricating material. Preferably, the lifting column also includes a second sliding member, which is fixed to the second lead screw 6 and located inside the second sleeve 205. The second sliding member is slidably connected to the second sleeve 205, and the second sliding member and the second nut 4 are spaced apart along the axial direction of the second lead screw 6.

[0049] Optionally, such as Figure 7 As shown, the inner cylinder 7 includes a cylinder body 701 located inside the middle cylinder 9 and a top seat 702 located outside the middle cylinder 9. The top seat 702 is located above both the middle cylinder 9 and the outer cylinder 8. The first lead screw 5 is fixedly connected to the top seat 702. The lifting column also includes a first protective cover 17, which is fixed below the top seat 702 and covers the outer cylinder 8. By setting the first protective cover 17, it can provide rain protection when the lifting column is in the retracted state and also has a certain dust protection effect.

[0050] Alternatively, please continue to refer to Figure 7The lifting column also includes a second protective cover 18, which is fixed to the top of the middle cylinder 9 and covers the outer cylinder 8. The first protective cover 17 covers the second protective cover 18. When the lifting column is in the extended state, the bottom of the first protective cover 17 can still cover the outside of the second protective cover 18, and the bottom of the second protective cover 18 can cover the outside of the outer cylinder 8. At this time, in rainy weather, the water falling on the top seat 702 can flow downwards in sequence along the first protective cover 17, the second protective cover 18, and the outer cylinder 18, which has excellent waterproof performance, can adapt to harsh weather conditions, and enhances the scope of application.

[0051] Optionally, such as Figure 8 As shown, the lifting column also includes several first sliding components. Each first sliding component includes a first slide rail 19 fixed to one of the inner cylinder 7 and the middle cylinder 9, and a first slide platform 20 fixed to the other of the inner cylinder 7 and the middle cylinder 9. The first slide platform 20 is slidably disposed on the first slide rail 19. In this embodiment, an exemplary scheme is provided where the first slide rail 19 is provided in the inner cylinder 7 and the first slider 23 is provided in the middle cylinder 9. The first sliding components ensure smooth relative sliding between the inner cylinder 7 and the middle cylinder 9. Multiple first sliding components are provided, and these components are spaced apart along the circumference of the inner cylinder 7.

[0052] Optionally, the lifting column further includes several second sliding components. Each second sliding component includes a second slide rail 21 fixed to one of the middle cylinder 9 and the outer cylinder 8, and a second slide platform 22 fixed to the other of the middle cylinder 9 and the outer cylinder 8. The second slide platform 22 is slidably disposed on the second slide rail 21. In this embodiment, an exemplary scheme is provided where the second slide rail 21 is provided in the middle cylinder 9 and the second slider 24 is provided in the outer cylinder 8. The second sliding components ensure smooth relative sliding between the middle cylinder 9 and the outer cylinder 8. Preferably, the number of second sliding components is set to multiple, and the multiple second sliding components are spaced apart along the circumferential direction of the middle cylinder 9. Optionally, as... Figure 8As shown, the lifting column further includes a first slider 23 disposed on the inner cylinder 7, the first slider 23 abutting against the middle cylinder 9 and capable of sliding relative to the middle cylinder 9; and / or, the lifting column further includes a second slider 24 disposed on the middle cylinder 9, the second slider 24 abutting against the inner cylinder 7 and capable of sliding relative to the inner cylinder 7. In this embodiment, an exemplary scheme of providing a first slider 23 on the inner cylinder 7 and a second slider 24 on the middle cylinder 9 is provided. By providing the first slider 23 and the second slider 24, the relative sliding of the inner cylinder 7 and the middle cylinder 9 can be further ensured, and shaking during the relative sliding process can be avoided. Preferably, both the first slider 23 and the second slider 24 are made of a self-lubricating material, such as nylon. More preferably, there are multiple first sliders 23 and second sliders 24, wherein the multiple first sliders 23 can be arranged in an array along the circumference of the inner cylinder 7 and along the vertical direction, and the multiple second sliders 24 can be arranged in an array along the circumference of the middle cylinder 9 and along the vertical direction.

[0053] Optionally, the lifting column further includes a third slider 25 disposed on the middle cylinder 9, the third slider 25 abutting against the outer cylinder 8 and capable of sliding relative to the outer cylinder 8; and / or, the lifting column further includes a fourth slider 26 disposed on the outer cylinder 8, the fourth slider 26 abutting against the middle cylinder 9 and capable of sliding relative to the middle cylinder 9. In this embodiment, an exemplary scheme of providing a third slider 25 on the middle cylinder 9 and a fourth slider 26 on the outer cylinder 8 is provided. By providing the third slider 25 and the fourth slider 26, the relative sliding of the middle cylinder 9 and the outer cylinder 8 can be further ensured, and shaking during the relative sliding process can be avoided. Preferably, both the third slider 25 and the fourth slider 26 are made of self-lubricating material, such as nylon. More preferably, there are multiple third sliders 25 and fourth sliders 26, wherein the multiple third sliders 25 can be arranged in an array along the circumference of the middle cylinder 9 and along the vertical direction, and the multiple fourth sliders 26 can be arranged in an array along the circumference of the outer cylinder 8 and along the vertical direction.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A lifting column, comprising a drive motor (1), a transmission mechanism (2) connected to the drive motor (1), a first nut (3) and a second nut (4) respectively connected to the transmission mechanism (2), a first lead screw (5) threaded to the first nut (3), a second lead screw (6) threaded to the second nut (4), an inner cylinder (7) fixedly connected to the first lead screw (5), an outer cylinder (8) fixedly connected to the second lead screw (6), and a middle cylinder (9) located between the inner cylinder (7) and the outer cylinder (8), wherein the outer cylinder (8) is slidably sleeved on the middle cylinder (9), and the middle cylinder (9) is slidably sleeved on the inner cylinder (7), and both the drive motor (1) and the transmission mechanism (2) are disposed on the middle cylinder (9), characterized in that: The transmission mechanism (2) includes a first gear (201) fixed to the output shaft of the drive motor (1), a second gear (202) meshing with the first gear (201), a third gear (203) meshing with the second gear (202), a first sleeve (204) fixedly connected to the second gear (202), and a second sleeve (205) fixedly connected to the third gear (203). The first sleeve (204) is fixedly connected to the first nut (3), and the second sleeve (205) is fixedly connected to the second nut (4).

2. The lifting column according to claim 1, characterized in that, The lifting column also includes a gearbox (27), in which the first gear (201), the second gear (202) and the third gear (203) are encapsulated, the first sleeve (204) and the second sleeve (205) are rotatably inserted through the gearbox (27), the housing of the drive motor (1) is fixed to the gearbox (27), and the gearbox (27) is fixedly connected to the middle cylinder (9).

3. The lifting column according to claim 2, characterized in that, The lifting column also includes a first bearing (10) and a second bearing (11) located on both sides of the second gear (202), and a third bearing (12) and a fourth bearing (13) located on both sides of the third gear (203). The first bearing (10) and the second bearing (11) are both sleeved on the first sleeve (204), and the third bearing (12) and the fourth bearing (13) are both sleeved on the second sleeve (205). The first bearing (10), the second bearing (11), the third bearing (12) and the fourth bearing (13) all abut against the gearbox (27).

4. The lifting column according to claim 1, characterized in that, The lifting column also includes a cable (14) electrically connected to the drive motor (1) and a fixing block (15) disposed on the outer cylinder (8). The fixing block (15) is used to fix the cable (14) to the outer cylinder (8). The portion of the cable (14) located between the fixing block (15) and the drive motor (1) is in the shape of a spiral.

5. The lifting column according to claim 4, characterized in that, The drive motor (1) includes a servo motor and an encoder integrated into the servo motor, and the cable (14) includes a motor cable for connecting the servo motor and an encoder cable for connecting the encoder.

6. The lifting column according to claim 1, characterized in that, The lifting column also includes a first sliding member (16), which is fixed to the first lead screw (5) and located inside the first sleeve (204). The first sliding member (16) is slidably connected to the first sleeve (204), and the first sliding member (16) and the first nut (3) are spaced apart along the axial direction of the first lead screw (5).

7. The lifting column according to claim 1, characterized in that, The inner cylinder (7) includes a cylinder body (701) located inside the middle cylinder (9) and a top seat (702) located outside the middle cylinder (9). The top seat (702) is located above both the middle cylinder (9) and the outer cylinder (8). The first lead screw (5) is fixedly connected to the top seat (702). The lifting column also includes a first protective cover (17), which is fixed below the top seat (702) and covers the outer cylinder (8).

8. The lifting column according to claim 1, characterized in that, The lifting column also includes several first sliding components. The first sliding components include a first slide rail (19) fixed on one of the inner cylinder (7) and the middle cylinder (9), and a first slide table (20) fixed on the other of the inner cylinder (7) and the middle cylinder (9). The first slide table (20) is slidably disposed on the first slide rail (19). The lifting column also includes several second sliding components. The second sliding components include a second slide rail (21) fixed on one of the middle cylinder (9) and the outer cylinder (8), and a second slide table (22) fixed on the other of the middle cylinder (9) and the outer cylinder (8). The second slide table (22) is slidably disposed on the second slide rail (21).

9. The lifting column according to any one of claims 1-8, characterized in that, The lifting column further includes a first slider (23) disposed in the inner cylinder (7), the first slider (23) abutting against the middle cylinder (9) and being able to slide relative to the middle cylinder (9); and / or, The lifting column also includes a second slider (24) disposed in the middle cylinder (9), the second slider (24) abutting against the inner cylinder (7) and being able to slide relative to the inner cylinder (7).

10. The lifting column according to claim 9, characterized in that, The lifting column further includes a third slider (25) disposed in the middle cylinder (9), the third slider (25) abutting against the outer cylinder (8) and being able to slide relative to the outer cylinder (8); and / or, The lifting column also includes a fourth slider (26) disposed on the outer cylinder (8), the fourth slider (26) abutting against the middle cylinder (9) and being able to slide relative to the middle cylinder (9).

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