An electric lifting column, a lifting table frame and a lifting table

Abstract

The utility model discloses a kind of electric lifting column, lifting table frame and lifting table, electric lifting column includes drive unit, transmission unit and sleeve assembly, the transmission unit is set in the sleeve assembly and drive the sleeve assembly axial telescopic, the end of the sleeve assembly is equipped with gear box, the gear box is embedded with connecting piece towards one end of the sleeve assembly, the part of the connecting piece protruding in the gear box is inserted with the sleeve assembly, and at least one welding is formed with the sleeve assembly, in this way, while guaranteeing the strength of electric lifting column, lifting table, the appearance of electric lifting column and lifting table is also considered, to effectively improve the user's use experience.

Description

Technical Field

[0001] This application relates to the field of table technology, and further to an electric lifting column, a lifting table frame, and a lifting table. Background Technology

[0002] A height-adjustable desk typically consists of a desktop, a frame, a height-adjustable column, feet, and an electrical unit (control box, hand controller, etc.). The height-adjustable column is installed under the frame, and its linear movement allows for adjustable desktop height, thus meeting the needs of employees who work at a desk for long periods of time to alternate between sitting and standing.

[0003] Depending on the number of lifting columns, height-adjustable desks can be categorized into single-column, double-column, and four-column types. Chinese patent CN219422425U discloses a quick-connect electrical-connection height-adjustable desk frame and an electric height-adjustable desk, specifically a double-column desk. To ensure the desk's strength, the tabletop is fixed to the frame. The top of each lifting column has a large motor box, which is securely connected between two connecting beams of the frame. This structure offers good rigidity, and the lifting columns are positioned in the middle of the desk, allowing the tabletop to partially obscure the frame and the connection between the frame and the lifting columns, thus minimizing aesthetic concerns. However, this structure is not suitable for four-column desks. The lifting columns of a four-column desk are flush with the frame and relatively close to the edge of the tabletop, leaving insufficient space for the motor box. There is also a noticeable gap between the outer edge of the lifting columns and the tabletop frame and the tabletop edge, and the lifting columns are relatively thick, failing to meet aesthetic requirements.

[0004] Chinese patent CN217851815U discloses a four-column U-shaped support frame and a four-column height-adjustable desk. The uprights use a motorless box structure, and the motor is fastened to the lifting uprights with screws. L-shaped connecting pieces are welded on the lifting uprights, and the lifting uprights are connected to the desk frame with screws through the connecting pieces. Although this connection method meets the strength requirements, it cannot make the lifting uprights flush with the desk frame, resulting in poor aesthetics. The four-column height-adjustable desk uses small tubular lifting uprights, which limits space. To make the lifting uprights flush with the desk frame, the screw method is difficult to apply.

[0005] Therefore, this utility model is dedicated to solving the above-mentioned technical problems and provides an electric lifting column, lifting table frame and lifting table that take into account both connection strength and aesthetics. Utility Model Content

[0006] In view of the above-mentioned technical problems, the purpose of this application is to propose an electric lifting column and lifting table solution to address the shortcomings of the prior art.

[0007] To achieve the above objectives, this application provides an electric lifting column, including a drive unit, a transmission unit, and a sleeve assembly. The transmission unit is disposed within the sleeve assembly and drives the sleeve assembly to extend and retract axially. A gearbox is provided at one end of the sleeve assembly, and a connector is embedded at one end of the gearbox facing the sleeve assembly. The portion of the connector protruding from the gearbox is inserted into the sleeve assembly and forms at least one weld with the sleeve assembly. The aforementioned welding includes, but is not limited to, resistance welding, friction welding, induction welding, ultrasonic welding, and diffusion welding.

[0008] In some embodiments, the sleeve assembly includes at least an outer tube and an inner tube. Considering that the outer tube and the inner tube can be installed upright or inverted, the gearbox can be located at the end of the outer tube, and the connector can be inserted into the outer tube and welded to the inner wall of the outer tube at least once; or, the gearbox can be located at the end of the inner tube, and the connector can be inserted into the inner tube and welded to the inner wall of the inner tube at least once.

[0009] Furthermore, the sleeve assembly is a three-section telescopic structure, comprising an outer tube, a middle tube, and an inner tube. In this structure, considering that the outer tube and the inner tube can be installed upright or inverted, the gearbox can be located at the end of the outer tube, and the connector can be inserted into the outer tube and welded to the inner wall of the outer tube at least once; or, the gearbox can be located at the end of the inner tube, and the connector can be inserted into the inner tube and welded to the inner wall of the inner tube at least once.

[0010] In some embodiments, the connector and the sleeve assembly are made of iron, the connector and the sleeve assembly are connected by resistance welding, the gearbox is made of zinc alloy or aluminum alloy, and the connector is die-cast integrally with the gearbox.

[0011] In some embodiments, the connector includes a first mounting portion and a second mounting portion, the first mounting portion being located inside the gearbox and the second mounting portion protruding outside the gearbox.

[0012] In some embodiments, the first mounting part includes a frame-shaped body, the frame-shaped body extending downward to form a mounting wall, the inner side of the frame-shaped body extending to form a boss, and the mounting wall and / or the boss having through holes.

[0013] In some embodiments, the first mounting portion includes a frame-shaped body that extends downward to form a mounting wall; the mounting wall has at least one break structure with intermittently provided grooves on its edge, and the portion of the mounting wall that protrudes outside the gearbox forms the second mounting portion.

[0014] In some embodiments, the gearbox extends downward to form a docking structure corresponding to the disconnection structure, and the docking structure has intermittent notches on its edge; the docking structure is used to be inserted into the disconnection structure so that the groove and the notch fit together to form a fitting portion.

[0015] In some embodiments, the sleeve assembly has a circular or square cross-sectional shape, and the cross-sectional shape of the fitting portion is adapted to the sleeve assembly.

[0016] In some embodiments, the connector includes a first mounting portion and a second mounting portion, the first mounting portion being fixedly connected to the gearbox, and the second mounting portion being a continuous structure inserted into the sleeve assembly.

[0017] In some embodiments, the drive unit includes a drive motor having an output shaft, a worm gear extending from the output shaft, a first bearing and a second bearing respectively disposed on the worm gear and the output shaft, and the gearbox having a first mounting groove for mounting the first bearing and a second mounting groove for mounting the second bearing inside.

[0018] In some embodiments, the drive motor and the gearbox are connected by shoulder screws, and a buffer pad is provided between the drive motor and the gearbox.

[0019] In some embodiments, the buffer pad is provided with a first through hole, and the front end cover of the drive motor is provided with a second through hole, so that the shoulder screw passes through the second through hole and the first through hole to connect with the gearbox; a buffer sleeve is provided in the second through hole, and a buffer pad ring is provided between the end of the shoulder screw and the front end cover, and the buffer pad, the buffer sleeve and the buffer pad ring are integrally formed.

[0020] In some embodiments, the gearbox housing has a through hole connecting the upper and lower sides, a mounting component is fixed to the upper end of the housing, and the upper end of the transmission unit is axially fixedly connected to the mounting component via a third bearing.

[0021] In some embodiments, the transmission unit includes a lead screw assembly and a worm gear sleeved on the outside of the lead screw assembly, the worm gear being used for connection with a worm gear drive; The upper end of the lead screw assembly is fixedly connected to the inner ring of the third bearing; the upper inner side of the mounting component is provided with a limiting step, the upper part of the outer ring of the third bearing abuts against the limiting step, the lower part of the outer ring of the third bearing is provided with a retaining ring for the hole, the third bearing is axially limited between the limiting step and the retaining ring for the hole, and the upper and lower ends of the third bearing are respectively provided with shaft retaining rings, and the two shaft retaining rings abut against both sides of the inner ring of the third bearing.

[0022] This application also provides a height-adjustable table frame, including any of the electrically adjustable lifting columns described above, and further comprising: The gearbox is provided with at least one connecting structure; A connecting beam is inserted into the connecting structure and fixedly connected to the electric lifting column.

[0023] This application also provides a height-adjustable desk, including a desktop and an electric lifting column as described above, or a height-adjustable desk frame as described above, wherein the edge of the desktop is flush with the electric lifting column or the height-adjustable desk frame.

[0024] Compared with the prior art, the electric lifting column, lifting table frame and lifting table provided in this application have the following beneficial effects: (1) The gearbox of this utility model is provided with a connector at one end facing the sleeve assembly. The connector protrudes from the gearbox and can be inserted into the sleeve assembly and welded to the sleeve assembly. This arrangement enhances the connection strength between the sleeve assembly and the gearbox, ensuring the stability and strength of the lifting table.

[0025] (2) The materials of the connector and sleeve assembly of this utility model are iron. The connector and sleeve assembly are connected by resistance welding. The material of the gearbox is zinc alloy or aluminum alloy. The connector and gearbox are die-cast as one piece. While fully ensuring the connection strength of the gearbox, connector and sleeve assembly, the material cost and manufacturing cost are reduced.

[0026] (3) The die-casting and resistance welding connection of this utility model is superior to the traditional mechanical connection structure, making the space of the gearbox more compact, so that the lifting column can be flush with the table frame, and after being connected to the tabletop, it can be extremely close to the edge of the tabletop, which improves the aesthetics of the electric lifting table.

[0027] (4) The connector of this utility model is provided with bosses, through holes and grooves, which can improve the connection strength between the connector and the gearbox.

[0028] (5) The worm and the output shaft of this utility model are respectively provided with a first bearing and a second bearing. The gearbox is provided with a first mounting groove for the first bearing and a second mounting groove for the second bearing, so that the worm and the output shaft are radially fixed, which can effectively ensure the meshing accuracy of the worm and the worm wheel.

[0029] (6) The drive motor and the gearbox of this utility model are connected by a shoulder screw. A buffer pad is provided between the drive motor and the gearbox. The buffer pad can effectively buffer the vibration of the motor transmitted to the table frame and the tabletop, and reduce the vibration and noise during the operation of the lifting table.

[0030] (7) The gearbox of this utility model is fixed with an installation part at the upper end. The upper end of the transmission unit is axially fixed to the installation part through a third bearing, and the axial force of the transmission unit is borne by the installation part.

[0031] (8) The connecting beam of the lifting table of this utility model is inserted and matched with the connecting structure on the gearbox, which can hide the connecting structure between the connecting beam and the gearbox well, and further improve the aesthetics of the lifting table. Attached Figure Description

[0032] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of this application.

[0033] Figure 1 This is a structural schematic diagram of a height-adjustable table provided by this utility model; Figure 2 This is a structural schematic diagram of a height-adjustable table frame provided by this utility model; Figure 3 This is a structural schematic diagram of the column body provided by this utility model; Figure 4 This is a schematic diagram of the gearbox provided by this utility model; Figure 5 This is a schematic diagram of the structure of the gearbox and the connecting parts when they are in contact. Figure 6 This is a schematic diagram of the internal structure of the column body provided by this utility model; Figure 7 This is a structural schematic diagram of a connector provided by this utility model; Figure 8 This is a partial enlarged schematic diagram of the transmission unit provided by this utility model; Figure 9 This is a schematic diagram of the structure of the worm gear and gear when they are engaged, as provided by this utility model; Figure 10 This is a schematic diagram of the structure of the gearbox and connecting parts provided by this utility model when they are in contact. Figure 11 This is a schematic diagram of the internal structure of the gearbox provided by this utility model; Figure 12 This is a schematic diagram of the structure of the buffer pad provided by this utility model; Figure 13 This is a partially enlarged schematic diagram of the height-adjustable table frame provided by this utility model.

[0034] Explanation of icon numbers: 1. Sleeve assembly; 11. Outer tube; 12. Gearbox; 121. Housing; 122. Through hole; 123. Butt joint structure; 124. Notch groove; 125. First mounting groove; 126. Second mounting groove; 127. Connection structure; 128. Mounting component; 1281. Limiting step; 1282. Hole retaining ring; 13. Inner tube; 2. Connector; 21. First mounting part; 211. Frame-shaped body; 212. Boss; 213. Mounting wall; 2131. Disconnection structure; 2132. Groove; 214. Through hole; 22. Second mounting part; 3. Drive motor; 31. Output shaft; 311. Second bearing; 312. Snap ring; 32. Worm gear; 321. First bearing; 33. Buffer pad; 331. Buffer sleeve; 332. Buffer pad ring; 34. Shoulder screw; 35. Front end cover; 4. Transmission unit; 41. Worm gear; 42. Lead screw; 421. Shaft retaining ring; 43. Lead screw nut; 44. Third bearing; 45. Friction sleeve; 46. Torsion spring; 5. Desktop; 6. Adjustable table frame; 61. Connecting beam; 62. Diagonal bracing tube. Detailed Implementation

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort.

[0036] To keep the drawings concise, each drawing only schematically shows the parts relevant to the application; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" can mean not only "only one" but also "more than one."

[0037] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0038] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Example 1 In existing technologies, four-post height-adjustable desks mainly suffer from poor aesthetics and suboptimal connection structures. The centrally located motor box solution in a two-post design is unsuitable for a four-post layout, while existing motorless solutions often rely on screws to connect the columns to the table frame. This not only results in low assembly efficiency but also exposes the robust columns and connecting components, creating a noticeable gap with the tabletop edge and severely impacting the overall appearance. This is particularly true for small-tube four-post height-adjustable desks, where space constraints necessitate achieving flush alignment between the lifting columns and the table frame, and ensuring the connection is extremely close to the tabletop edge; screw connections are simply not feasible in such cases.

[0042] The electric lifting column provided in this embodiment is described in the appendix to the instruction manual. Figure 1 and attached Figure 2As shown, the electric lifting column in this embodiment includes a drive unit, a transmission unit 4, and a sleeve assembly 1. A gearbox 12 is fixed to the end of the sleeve assembly 1. The transmission unit 4 is located inside the sleeve assembly 1 and, under the action of the drive unit, drives the sleeve assembly 1 to extend and retract axially, thereby adjusting the height of the electric lifting column. Correspondingly, a connector 2 is provided at the end of the gearbox 12 facing the sleeve assembly 1, and the connector 2 is embedded and fixedly connected to the gearbox 12. A portion of the connector 2 protrudes from the outside of the gearbox 12, allowing the protruding part of the connector 2 to insert and engage with the sleeve assembly 1, ensuring a tight fit. Welding is performed at the insertion point of the connector 2 and the sleeve assembly 1, resulting in at least one weld between the connector 2 and the sleeve assembly 1. Specifically, there can be two, three, or four welds, thereby achieving a fixed connection between the gearbox 12 and the sleeve assembly 1.

[0043] The advantages of this connection method are as follows: By embedding a connector 2 at the end of the gearbox 12, the outwardly protruding part of the connector 2 is inserted into and welded to the sleeve assembly 1. This not only facilitates the assembly of the gearbox 12 and the sleeve assembly 1, but also effectively improves the strength of the lifting column. In addition, it effectively enhances the aesthetics of the electric lifting column.

[0044] See the instruction manual appendix Figure 3 and attached Figure 6 The sleeve assembly 1 includes at least an outer tube 11 and an inner tube 13. For ease of explanation, the sleeve assembly 1 in this embodiment includes an outer tube 11 and an inner tube 13.

[0045] Specifically, the outer tube 11 is fixedly connected to the gearbox 12, which is located at one end of the outer tube 11. The inner tube 13 is inserted from the other end of the outer tube 11, with one end of the inner tube 13 nested inside the outer tube 11. Driven by the transmission unit 4, the inner tube 13 can extend or retract axially along the outer tube 11, thereby achieving the lifting and lowering movement of the entire sleeve assembly 1. Alternatively, the gearbox 12 may be located at one end of the inner tube 13, depending on design requirements.

[0046] When the gearbox 12 is located at the end of the outer tube 11, the protruding portion of the connector 2, which is fitted with the gearbox 12, is inserted into the opening of the outer tube 11 and fixed to the inner wall of the outer tube 11 by at least one weld. Correspondingly, when the gearbox 12 is located at one end of the inner tube 13, the protruding portion of the connector 2, which is fitted with the gearbox 12, is inserted into the opening of the inner tube 13 and fixed to the inner wall of the outer tube 11 by at least one weld. This insertion and welding not only achieves a high-strength fixed connection between the connector 2 and the sleeve assembly 1, but also applies to sleeve assemblies with various cross-sectional shapes, including but not limited to square, circular, and elliptical shapes, as well as irregularly shaped sleeve assemblies.

[0047] In addition, in actual production applications, the sleeve assembly 1 may include three pipe fittings to achieve telescopic adjustment, and the gearbox 12 may be set as needed. It will not be described in detail here, but it is also within the protection scope of this utility model.

[0048] See the instruction manual appendix Figure 4 Appendix Figure 5 Appendix Figure 7 Appendix Figure 10 and attached Figure 11 The structure of the connector 2 mainly includes a first mounting part 21 and a second mounting part 22, which are arranged sequentially from top to bottom. The first mounting part 21 is installed and fixed inside the gearbox 12, and its shape matches the inner cavity of the gearbox 12. Correspondingly, the second mounting part 22 extends from the first mounting part 21 and protrudes from the outside of the gearbox 12.

[0049] Further, see the appendix to the instruction manual. Figure 7 In this embodiment, the first mounting portion 21 of the connector 2 includes a frame-shaped body 211. A boss 212 extends from the inner side of the frame-shaped body 211 towards the center, and a mounting wall 213 extends downward from the lower edge of the frame-shaped body 211. The first mounting portion 21 is disposed inside the gearbox 12 and is used for fixed connection with the interior of the gearbox 12. A through hole 214 is provided on at least one of the mounting wall 213 and the boss 212.

[0050] Regarding the connection, it is preferable that the gearbox 12 and the connector 2 are die-cast as a single unit. When the gearbox 12 and the first mounting part 21 are die-cast, molten metal flows into and fills the through hole 214, forming a mechanical interlock after solidification. Therefore, the through hole 214 enhances the bonding force between the connector 2 and the gearbox 12, effectively reducing the possibility of the connector 2 twisting or loosening under stress, thus ensuring the stability and reliability of the electric lifting column.

[0051] Furthermore, this embodiment provides another structure for the connector 2. The first mounting portion 21 also includes a frame-shaped body 211 and a downwardly extending mounting wall 213. The annular mounting wall 213 has at least one through-hole structure 2131, thereby dividing the mounting wall 213 into several independent parts. At the edge of each through-hole structure 2131, several grooves 2132 are intermittently formed, with the grooves 2132 arranged downwards sequentially. The portion of the mounting wall 213 protruding outside the gearbox 12 constitutes the second mounting portion 22, which is also a through-hole structure.

[0052] Accordingly, see the appendix to the instruction manual. Figure 7Several disconnecting structures 2131 are generally provided, distributed circumferentially along the connector 2. At least one mating structure 123 extends downward from the gearbox 12, with each mating structure 123 corresponding to one of the disconnecting structures 2131. When the first mounting portion 21 of the connector 2 is fixedly connected to the inner wall of the gearbox 12, the mating structure 123 and the disconnecting structure 2131 are inserted into each other. To further enhance the connection strength between the mating structure 123 and the mounting wall 213, notches 124 are intermittently provided on the edge of the mating structure 123, and the notches 124 and grooves 2132 are fitted together to form a mating portion.

[0053] Understandably, during die casting, the mating structure 123 of the gearbox 12 is precisely embedded into the disconnected structure 2131 of the connector 2, so that the notch 124 and the groove 2132 fit together to form a strong fitting part, while the space of the gearbox 12 is more compact and the aesthetics are higher.

[0054] The connector 2 and the sleeve assembly 1 are made of iron, and the gearbox 12 is made of zinc alloy or aluminum alloy. The connector 2 and the sleeve assembly 1 are connected by electronic welding. Correspondingly, the connector 2 and the gearbox 12 are die-cast as one piece.

[0055] It should be noted that the gearbox 12 has a relatively complex structure, requiring the installation of various parts and the connection of beams. If it were entirely made of iron, it would require casting or forging molds for manufacturing, but these two methods have low precision and require post-processing, resulting in very high production costs. In this embodiment, the gearbox 12 is made of zinc alloy or aluminum alloy, facilitating die-casting with the connector 2 and reducing costs. The connector 2 is embedded in the gearbox 12, while the connector 2 and the sleeve assembly 1 are made of iron, facilitating welding and ensuring weld strength. Specifically, the connector and the outer tube are made of SPCC iron alloy (Japanese Industrial Standard JIS G3141 cold-rolled carbon steel plate), and the gearbox is made of YX041 zinc alloy (YZZnAl4Cu1 die-cast zinc alloy material).

[0056] Connector 2 is placed as an insert in the die-casting mold of gearbox 12. Molten zinc alloy or aluminum alloy is then injected into the mold, cooled, and solidified, forming a die-cast integral connection between connector 2 and gearbox 12. During die-casting of gearbox 12 and first mounting part 21, molten metal flows into and fills through hole 214, solidifying to form a mechanical interlock. Correspondingly, the portion of connector 2 protruding from gearbox 12 is inserted into the end of sleeve assembly 1, and the two are fused together instantaneously at the contact surface by resistance welding. Therefore, this embodiment fully utilizes the characteristics of different materials and connection processes to ensure the connection strength between gearbox 12, connector 2, and sleeve assembly 1 while reducing material and manufacturing costs.

[0057] See the instruction manual appendix Figure 1 and Figure 2 The sleeve assembly 1 has a square cross-section, and correspondingly, the mating part also has a square cross-section to match the sleeve assembly 1, allowing the connector 2 to be inserted into the sleeve assembly 1. Alternatively, the sleeve assembly 1 can also have a circular cross-section, and correspondingly, the mating part can also have a circular cross-section to match the sleeve assembly 1, allowing the connector 2 to be inserted into the sleeve assembly 1.

[0058] Example 2 In this embodiment, the connector 2 includes a first mounting portion 21 and a second mounting portion 22 arranged sequentially downwards. The first mounting portion 21 is fixedly connected to the gearbox 12. A through hole 214 can be formed on the first mounting portion 21. When the gearbox 12 and the first mounting portion 21 are die-cast, molten metal will flow into and fill the through hole 214, forming a mechanical interlock after solidification. Of course, in actual production applications, there are various ways to install and fix the first mounting portion 21 to the inner wall of the gearbox 12, which will not be described one by one here, and all are within the protection scope of this utility model.

[0059] Correspondingly, unlike the second mounting part 22 in Embodiment 1 which is a disconnected structure, in this embodiment, the second mounting part 22 is a continuous structure. The second mounting part 22 is disposed outside the gearbox 12, so that the second mounting part 22 can be inserted into the sleeve assembly 1 and welded and fixed to the inner wall of the sleeve assembly 1.

[0060] Example 3 See the instruction manual appendix Figure 8 and Figure 9 The drive unit includes a drive motor 3, and the extended end of the output shaft 31 of the drive motor 3 has a worm gear 32. To achieve stable support, a first bearing 321 is mounted on the end of the worm gear 32, while a second bearing 311 is mounted on the output shaft 31. Correspondingly, the gearbox 12 has a first mounting groove 125 and a second mounting groove 126 respectively. The first bearing 321 is located in the first mounting groove 125, and the second bearing 311 is located in the second mounting groove 126. The first bearing 321 is preferably a sliding bearing, and the second bearing 311 is preferably a rolling bearing. The first bearing 321 and the second bearing 311 form a double-pivot support for the output shaft 31 and the worm gear 32, and provide radial positioning for the output shaft 31 and the worm gear 32.

[0061] Preferably, a retaining ring 312 is fixedly mounted on the output shaft 31. The retaining ring 312 is located on the side of the second bearing 311 away from the first bearing 321 and forms an axial limiting fit with the inner ring or shoulder of the second bearing 311. It can be understood that the main function of the retaining ring 312 is to reduce the movement of the output shaft 31, worm gear 32, and second bearing 311 away from the first bearing 321.

[0062] More preferably, see the appendix to the instruction manual. Figure 12 and Figure 13 The drive motor 3 and the gearbox 12 are connected by a shoulder screw 34, and a buffer pad 33 is sandwiched between the drive motor 3 and the gearbox 12.

[0063] Unlike existing technologies where the drive motor and gearbox are fixedly connected by fastening screws, in this embodiment, after the first bearing 321 and the second bearing 311 form a double-fulcrum positioning for the output shaft 31 and the worm gear 32, the use of shoulder screws 34 avoids over-positioning of the drive motor 3, and the buffer pad 33 achieves a flexible connection between the drive motor 3 and the gearbox 12. This effectively buffers the transmission of motor vibration to the table frame and desktop, reduces vibration and noise during the operation of the height-adjustable table, and improves the product's quietness performance.

[0064] See the instruction manual appendix Figure 13 A first through hole is formed on the buffer pad 33, and a second through hole is formed on the front end cover 35 of the drive motor 3. The buffer sleeve 331 is embedded in the second through hole of the front end cover 35, and the buffer pad ring 332 is placed between the lower end of the nut of the shoulder screw 34 and the surface of the front end cover 35. The buffer pad 33, the buffer sleeve 331, and the buffer pad ring 332 are integrally formed into a complete buffer component. The buffer pad 33 absorbs the vibration between the drive motor 3 and the gearbox 12, the buffer pad ring 332 absorbs the contact vibration between the nut and the surface of the front end cover 35, and the buffer sleeve 331 absorbs the vibration between the shoulder screw 34 and the front end cover 35, thereby further absorbing the vibration generated when the drive motor 3 is working, ensuring the stable and reliable operation of the electric lifting column.

[0065] During the operation of the lifting column, the gearbox 12 must withstand the axial force of the drive assembly. See the attached instruction manual. Figure 8 The gearbox 12 has a through hole 122 at the center of its housing 121. Since the connector 2 is resistance welded to the sleeve assembly, and the electrode extends into the sleeve assembly through the through hole 122, a complex load-bearing mechanism should not be installed inside the gearbox 12 to facilitate resistance welding. Therefore, a mounting component 128 is fixedly installed inside the upper end of the housing 121, and this mounting component 128 is coaxially arranged with the through hole 122. The upper end of the transmission unit 4 extends into the through hole 122 and is axially fixedly connected to the mounting component 128 via a third bearing 44. The mounting component 128 acts as a load-bearing component, bearing the axial force of the drive assembly.

[0066] Furthermore, the transmission unit 4 includes a lead screw assembly and a worm gear 41 fixedly sleeved on the upper end of the lead screw assembly. The worm gear 41 meshes with the worm 32 of the drive motor 3, and the drive motor 3 drives the output shaft 31 and the worm 32 to rotate, thereby driving the worm 32 and the lead screw assembly to rotate. The upper end of the lead screw assembly is fixedly connected to the inner ring of the third bearing 44. The upper part of the mounting part 128 is provided with a limiting step 1281. The upper part of the outer ring of the third bearing 44 abuts against the limiting step 1281. The lower part of the outer ring of the third bearing 44 is provided with a retaining ring 1282 for the hole. The third bearing 44 is axially limited between the limiting step 1281 and the retaining ring 1282. The upper and lower ends of the third bearing 44 are respectively provided with shaft retaining rings 421, and the two shaft retaining rings 421 abut against both sides of the inner ring of the third bearing 44.

[0067] Specifically, the lead screw assembly includes a lead screw 42, a lead screw nut 43, a friction sleeve 45, and a torsion spring 46. The worm gear 41, through its internal spline, engages with the external spline on the lead screw 42 to transmit power. The lead screw 42 is axially fixed within the gearbox 12 via a third bearing 44, allowing it to rotate within the sleeve assembly 1. The friction sleeve 45 is fitted onto the lead screw 42 and located below the worm gear 41. Its inner side also has an internal spline that mates with the external spline of the lead screw 42, enabling the friction sleeve 45, worm gear 41, and lead screw 42 to rotate synchronously in the axial direction. The torsion spring 46 is fitted onto the outside of the friction sleeve 45 to provide preload. The lead screw nut 43 is fitted onto the lead screw 42 and fixed to the inner tube 13, driving the inner tube 13 to move up and down.

[0068] When the drive motor 3 is working, the output shaft 31 drives the worm 32 to rotate, the worm 32 drives the worm wheel 41 to rotate, and the worm wheel 41 drives the lead screw 42 to rotate through a spline connection. The rotation of the lead screw 42 causes the lead screw nut 43 and the inner tube 13 to move linearly along the axis of the lead screw 42, realizing the lifting function.

[0069] Example 4 See the instruction manual appendix Figure 1 Appendix Figure 2 and attached Figure 13 This embodiment provides a height-adjustable desk frame 6, including an electric height-adjustable column as described in any of the above embodiments, and a connecting beam 61. At least one connecting structure 127 is provided on the gearbox 12. The connecting structure 127 is used for inserting and engaging the end of the connecting beam 61, and for fixing the connecting beam 61 to the electric height-adjustable column. The insertion and engagement of the connecting beam 61 with the connecting structure 127 on the gearbox 12 effectively conceals the connection structure between the connecting beam 61 and the gearbox 12, further enhancing the aesthetics of the height-adjustable desk and improving the strength of the height-adjustable desk frame 6.

[0070] It should be noted that the number of connecting structures 127 on the connecting beam 61 is determined according to the number of electric lifting columns. For example, for a double-column lifting table, one connecting structure 127 is provided on the gearbox 12, two connecting structures 127 are located on the side of the two gearboxes 12 that are close to each other, and the two connecting structures 127 are respectively inserted and fixed to both ends of the connecting beam 61. For the attached... Figure 1 In the four-post height-adjustable desk, each gearbox 12 is equipped with two vertically arranged connecting structures 127, and connecting beams 61 are arranged between two adjacent connecting structures 127 and are inserted into and cooperate with the connecting structures 127. For the four-post height-adjustable desk, in order to further improve the support strength, diagonal bracing tubes 62 are also provided between two adjacent connecting beams 61. The diagonal bracing tubes 62 are arranged within the space enclosed by the four connecting beams 61, which can further improve the aesthetics of the height-adjustable desk.

[0071] Example 5 See the instruction manual appendix Figure 1 This embodiment provides a height-adjustable desk, which includes a desktop 5 and a height-adjustable desk frame 6 as described in the above embodiments, or the height-adjustable desk includes a desktop 5 and an electrically operated height-adjustable column as described in any of the above embodiments. The height-adjustable desk provided in this embodiment has its height-adjustable column and desk frame positioned near the edge of the desktop, or even substantially flush with the edge of the desktop, and features high strength, high aesthetics, and low noise.

[0072] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An electric lifting column, comprising a drive unit, a transmission unit (4), and a sleeve assembly (1), wherein the transmission unit (4) is disposed within the sleeve assembly (1) and drives the sleeve assembly (1) to extend and retract axially, and a gearbox (12) is provided at the end of the sleeve assembly (1), characterized in that, The gearbox (12) has a connector (2) embedded at one end facing the sleeve assembly (1). The portion of the connector (2) protruding from the gearbox (12) is inserted into the sleeve assembly (1) and is welded to the sleeve assembly (1) at least once.

2. The electric lifting column according to claim 1, characterized in that, The sleeve assembly (1) includes at least an outer tube (11) and an inner tube (13). The gearbox (12) is disposed at the end of the outer tube (11). The connector (2) is inserted into the outer tube (11) and welded to the inner wall of the outer tube (11) at least once. Alternatively, the gearbox (12) is disposed at the end of the inner tube (13). The connector (2) is inserted into the inner tube (13) and welded to the inner wall of the inner tube (13) at least once.

3. The electric lifting column according to claim 1, characterized in that, The connector (2) and the sleeve assembly (1) are made of iron. The connector (2) and the sleeve assembly (1) are connected by resistance welding. The gearbox (12) is made of zinc alloy or aluminum alloy. The connector (2) and the gearbox (12) are die-cast as a whole.

4. The electric lifting column according to claim 1, characterized in that, The connector (2) includes a first mounting part (21) and a second mounting part (22), the first mounting part (21) being located inside the gearbox (12) and the second mounting part (22) protruding outside the gearbox (12).

5. An electrically operated lifting column according to claim 4, characterized in that, The first mounting part (21) includes a frame-shaped body (211), which extends downward to form a mounting wall (213), and a boss (212) extends inside the frame-shaped body (211). A through hole (214) is provided on the mounting wall (213) and / or the boss (212).

6. An electrically operated lifting column according to claim 4, characterized in that, The first mounting part (21) includes a frame-shaped body (211), which extends downward to form a mounting wall (213); the mounting wall (213) is provided with at least one disconnection structure (2131), and the edge of the disconnection structure (2131) is intermittently provided with grooves (2132); the portion of the mounting wall (213) protruding outside the gearbox (12) forms the second mounting part (22).

7. An electrically operated lifting column according to claim 6, characterized in that, The gearbox (12) extends downward to form a docking structure (123) corresponding to the disconnection structure. The docking structure (123) has intermittent notches (124) on its edge. The docking structure (123) cooperates with the disconnection structure (2131) so that the groove (2132) and the notch (124) fit together to form a fitting part.

8. An electrically operated lifting column according to claim 7, characterized in that, The cross-sectional shape of the sleeve assembly (1) is circular or square, and the cross-sectional shape of the fitting part is adapted to the sleeve assembly (1).

9. An electrically operated lifting column according to claim 1, characterized in that, The connector (2) includes a first mounting part (21) and a second mounting part (22). The first mounting part (21) is fixedly connected to the gearbox (12), and the second mounting part (22) is a continuous structure that is inserted into the sleeve assembly (1).

10. An electrically operated lifting column according to claim 1, characterized in that, The drive unit includes a drive motor (3), the drive motor (3) has an output shaft (31), the extended end of the output shaft (31) has a worm (32), the end of the worm (32) and the output shaft (31) are respectively provided with a first bearing (321) and a second bearing (311), and the gearbox (12) is provided with a first mounting groove (125) for mounting the first bearing (321) and a second mounting groove (126) for mounting the second bearing (311).

11. An electrically operated lifting column according to claim 10, characterized in that, A retaining ring (312) is fixedly provided on the output shaft (31). The retaining ring (312) is located on the side of the second bearing (311) away from the first bearing (321). The retaining ring (312) forms an axial limiting fit with the inner ring or shoulder of the second bearing (311).

12. An electrically operated lifting column according to claim 10, characterized in that, The drive motor (3) and the gearbox (12) are connected by a shoulder screw (34), and a buffer pad (33) is provided between the drive motor (3) and the gearbox (12).

13. An electrically operated lifting column according to claim 12, characterized in that, The buffer pad (33) is provided with a first through hole, and the front end cover (35) of the drive motor (3) is provided with a second through hole, so that the shoulder screw (34) can pass through the second through hole and the first through hole to connect with the gearbox (12); a buffer sleeve (331) is provided in the second through hole, and a buffer pad ring (332) is provided between the end of the shoulder screw (34) and the front end cover (35), and the buffer pad (33), the buffer sleeve (331) and the buffer pad ring (332) are integrally formed.

14. An electrically operated lifting column according to claim 1, characterized in that, The gearbox (12) has a housing (121) with a through hole (122) connecting the upper and lower sides. An installation part (128) is fixed at the upper end of the housing (121). The upper end of the transmission unit (4) is axially fixed to the installation part (128) through a third bearing (44).

15. An electrically operated lifting column according to claim 14, characterized in that, The transmission unit (4) includes a lead screw assembly and a worm wheel (41) sleeved on the upper end of the lead screw assembly. The worm wheel (41) is used for transmission connection with the worm (32). The upper end of the lead screw assembly is fixedly connected to the inner ring of the third bearing (44); the upper inner side of the mounting part (128) is provided with a limiting step (1281), the upper part of the outer ring of the third bearing (44) abuts against the limiting step (1281), the lower part of the outer ring of the third bearing (44) is provided with a retaining ring (1282), the third bearing (44) is axially limited between the limiting step (1281) and the retaining ring (1282), and the upper and lower ends of the third bearing (44) are respectively provided with shaft retaining rings (421), and the two shaft retaining rings (421) abut against both sides of the inner ring of the third bearing (44).

16. A height-adjustable table frame, characterized in that, Including the connecting beam (61) and an electrically operated lifting column as described in any one of claims 1-15, further comprising: At least one connecting structure (127) is provided on the gearbox (12). The connecting beam (61) is fixedly connected to the electric lifting column through the connecting structure.

17. A height-adjustable desk, comprising a desktop and an electrically operated lifting column as described in any one of claims 1-15, or a height-adjustable desk frame as described in claim 16, wherein the edge of the desktop (5) is flush with the electrically operated lifting column or the height-adjustable desk frame.

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