Quickly assembled desk frame connection structure, and electric height-adjustable desk

Abstract

The present invention relates to the technical field of electric height-adjustable desks, and in particular to a quickly assembled desk frame connection structure, and an electric height-adjustable desk. The quickly assembled desk frame connection structure comprises: a frame assembly; and several lifting columns, which support the frame assembly, and each of which comprises a telescopic assembly and an iron box arranged at an end of the telescopic assembly, wherein one of a side wall of the iron box and an inner wall of a beam assembly is provided with several step-shaped bumps, and the other is provided with notches matching the bumps; the front wall of the iron box is provided with a locking assembly which is a locking wedge-shaped plate connected to the front wall by means of several elastic members, the force of the elastic members being directed towards the opening of the iron box; and locking wings are provided on two sides of a first surface wall of the locking wedge-shaped plate and same extend beyond the side wall of the iron box, and the locking wings are embedded into locking slots of the beam assembly. In the present invention, when the lifting columns are mounted into a frame, the locking assemblies automatically lock the lifting columns to the frame, thereby achieving quick assembly.

Description

Quick assembly table frame connection structure and electric lifting table Technical Field

[0001] The present invention relates to the technical field of intelligent office furniture, in particular to a quick-assembly table frame connection structure and an electric lift table. Background Art

[0002] Electric height-adjustable desks are increasingly becoming part of everyday life. Their quick height adjustment feature perfectly meets the sit-stand function needs of desk-bound workers. However, existing electric height-adjustable desks on the market typically require eight or more screws to secure the frame and columns, making installation difficult, inefficient, time-consuming, and labor-intensive.

[0003] To address this issue, a Chinese patent (CN217565255U) discloses a quick-install electric lift table. Its main technical solution involves providing a slot on the lift column and a shaft on the frame. A latch mechanism consisting of two sets of shafts and slots secures the lift column and frame together, while a locking device prevents the lift column and frame from disengaging. However, the two latch mechanisms require high positioning accuracy, resulting in relatively high manufacturing costs. Furthermore, this technical solution cannot compensate for the gaps created by wear between the shaft and slot, leading to a loose connection between the lift column and frame after prolonged use.

[0004] A Chinese patent (CN107981540A) discloses a quick-assembly table frame. Its technical solution involves providing beveled notches and matching beveled bumps on the lifting columns and frame, and installing a crank wrench on the frame to compress the lifting columns and frame. However, a disadvantage is that the crank wrench requires a separate installation, and initial installation must be performed according to the installation instructions. If the crank wrench is forgotten or improperly installed, there is a safety risk of the lifting columns and frame detaching.

[0005] Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the disadvantage of the existing technology that the electric lifting table frame is not quick to install, and to provide a quick-assembly table frame connection structure that is easy to install, safe and reliable, and automatically locked.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a quick-assembly table frame connection structure, comprising a frame assembly and a plurality of lifting columns supporting the frame assembly, the frame assembly comprising a crossbeam assembly and a longitudinal beam connected to the crossbeam assembly, the lifting column comprising a telescopic assembly and an iron box arranged at the end of the telescopic assembly, the iron box being arranged between the two crossbeams of the crossbeam assembly, and a plurality of step-shaped protrusions are provided on either the side wall of the iron box or the inner wall of the crossbeam assembly, while the other is provided with a notch adapted to the protrusions, a locking assembly is provided on the front wall of the iron box, the locking assembly is a locking wedge plate connected to the front wall by a plurality of elastic members, the force of the elastic members is directed toward the direction of the opening of the iron box, locking wings are provided on both sides of the first wall of the locking wedge plate that extend beyond the side walls, the locking wings are embedded in the locking groove of the crossbeam assembly, so that the protrusions fit into the notch, thereby locking the lifting column on the frame assembly.

[0008] Furthermore, a first connecting portion is provided on the iron box, a second connecting portion is provided on the locking wedge plate, and two ends of the elastic member are respectively connected to the first connecting portion and the second connecting portion.

[0009] Furthermore, the second connecting portion is also provided with a waist opening.

[0010] Furthermore, a through hole adapted to the second connecting portion is provided on the front wall, and the second connecting portion penetrates into the iron box through the through hole.

[0011] Furthermore, the locking wing forms a certain angle with the first surface wall.

[0012] Furthermore, the angle is 5°-30°.

[0013] Furthermore, the locking groove is an independent groove or is combined with the notch into one groove.

[0014] Furthermore, the front wall is a slanted wall extending toward the outside of the opening of the iron box, the first surface wall of the locking wedge plate is in contact with the front wall, the locking wing has a vertically downward locking surface, and the locking wing is embedded in the locking groove of the crossbeam assembly.

[0015] Furthermore, the front wall is a vertical wall pointing vertically downward, the first surface wall of the locking wedge plate is in contact with the front wall, the locking wing is an inclined surface, and the locking wing is embedded in the locking groove of the beam assembly.

[0016] Furthermore, the lower side of the locking wing is provided with a rounded corner.

[0017] Furthermore, the locking wedge plate is made of metal or plastic.

[0018] Furthermore, the elastic member is a tension spring or a compression spring.

[0019] Furthermore, the number of the elastic members is 2, and the elastic members are arranged at both ends of the inner side of the front wall.

[0020] Furthermore, the front wall is provided with an unlocking hole and an unlocking support.

[0021] Furthermore, the locking wedge plate is provided with an unlocking handle.

[0022] Furthermore, the beam assembly includes two parallel beams, a connector clamped between the two beams, and a connector clamped at the ends of the two beams, and the connector detachably fixes the two beams into one.

[0023] Furthermore, the connecting member is provided with a first bayonet portion adapted to the size of the beam, a first undercut is protruded from the outer vertical wall of the first bayonet portion on the connecting member, and a slot adapted to the first undercut is provided on the outer side wall of the beam.

[0024] Furthermore, the width of the first bayonet portion is greater than the width of the crossbeam, and a locking insert is provided between the first bayonet portion and the crossbeam.

[0025] Furthermore, the locking insert is provided with a second undercut, and the connecting piece is provided with a bayonet adapted to the second undercut.

[0026] The present invention also provides an electric lift table, which adopts the quick-assembly table frame connection structure in the above solution.

[0027] The beneficial effects of the present invention are:

[0028] (1) The technical solution disclosed in the present invention provides matching protrusions and notches at the junction of the lifting column and the frame, and a locking assembly is provided on the iron box of the lifting column. When the lifting column is installed in the frame, the locking assembly automatically locks the lifting column and the frame under the action of the elastic member. The installation speed is very fast and there is no need to install a crank wrench or screws separately. It can effectively prevent the lifting column and the frame from being separated due to missing screws, missing crank wrench or improper installation of the crank wrench, thereby greatly improving the safety of the lifting table when in use.

[0029] (2) After the lifting column and the frame of the present invention are installed in place, the locking assembly can make a "click" sound to remind the installer that the lifting column has been installed in place, realizing tool-free and quick installation, reducing installation difficulty and improving installation efficiency. It saves installation costs and after-sales service costs;

[0030] (3) The locking assembly disclosed in the present invention is provided with a pre-force, which can automatically adjust the depth of the locking wedge plate inserted into the locking groove. This solution has lower processing precision requirements for the lifting column and the frame, thereby reducing processing costs;

[0031] (4) The locking assembly of the present invention is provided with a pre-force that can continuously tighten the lifting column and the frame, making the connection between the lifting column and the frame more stable. During the use of the electric lifting table, if the tabletop swings horizontally or vertically, resulting in a gap at the connection between the lifting column and the frame, the locking assembly can adaptively fill the gap under the influence of the pre-force, which can effectively prevent the electric lifting table from shaking more and more after long-term use;

[0032] (5) The locking assembly disclosed in the present invention is provided with an unlocking structure. When the electric lifting table needs to be disassembled, the lifting column and the frame can be disassembled and separated only after overcoming the preload force of the locking wedge plate. This can avoid the safety risks caused by children's misoperation due to mischief or curiosity, and meet the needs of adults for quick disassembly.

[0033] (6) The frame disclosed in the present invention is a quick-assembly frame, in which the crossbeams and longitudinal beams are connected by connecting pieces, just like building blocks. The assembly is simpler and faster, resulting in a smaller packaging volume and less packaging materials, thus achieving the goal of saving resources.

[0034] (7) The parts of the frame disclosed in the present invention are independent, which reduces the welding process, reduces welding deformation, and reduces the manufacturing difficulty and precision requirements. It not only reduces the manufacturing cost, but also reduces the quality cost caused by poor welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below with reference to the accompanying drawings and examples.

[0036] FIG1 is a schematic diagram of the overall structure of the table frame of the present invention;

[0037] FIG2 is a schematic diagram of the assembly of the lifting column and the frame in the present invention;

[0038] FIG3 is an enlarged view of the details of point A in FIG2 of the present invention;

[0039] FIG4 is an exploded schematic diagram of the iron box and the locking assembly of the present invention;

[0040] FIG5 is a cross-sectional view of a locking assembly according to a first embodiment of the present invention;

[0041] FIG6 is a cross-sectional view of a locking assembly according to a second embodiment of the present invention;

[0042] FIG7 is a schematic diagram of the unlocking portion of the locking assembly of the present invention;

[0043] FIG8( a ) is a cross-sectional view of step 1 of the installation process of the lifting column in the present invention;

[0044] FIG8( b ) is a schematic diagram of the appearance of the lifting column installation process in step 1 of the present invention;

[0045] FIG9( a ) is a cross-sectional view of step 2 of the installation process of the lifting column in the present invention;

[0046] FIG9( b ) is a schematic diagram of the appearance of step 2 of the installation process of the lifting column in the present invention;

[0047] Figure 10 is a schematic diagram of the frame assembly structure of the present invention;

[0048] 11 is a schematic diagram of the appearance and structure of the connector of the present invention;

[0049] 12 is a schematic diagram of the shape and structure of the beam of the present invention;

[0050] FIG13 is a schematic diagram of the appearance and structure of the locking insert in the present invention.

[0051] In the picture:

[0052] 100. Frame assembly; 110. Crossbeam assembly; 111. Crossbeam; 111a. Notch; 111b. Locking slot; 111c. Clamping slot; 112. Connector; 112a. First undercut; 112b. Clamping slot; 112c. First clamping portion; 113. Locking tab; 113a. Second undercut; 120. Longitudinal beam;

[0053] 200. Lifting column; 211. Iron box; 211a. First connecting part; 211b. Through hole; 211c. Unlocking support; 211d. Unlocking hole; 211e. Bump; 211f. Front wall; 211g. Side wall; 212 Elastic member; 213. Locking wedge plate; 213a. Second connecting part; 213b. Locking wing; 213c. First wall; 213d. Rounded corner; 213e. Unlocking handle; 220. Telescopic assembly. DETAILED DESCRIPTION

[0054] The present invention will now be further described with reference to the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0055] Example 1

[0056] As shown in Figures 1 and 2, the technical solution disclosed in the present invention is a quick-assembly table frame connection structure, comprising a frame assembly 100 and several lifting columns 200 supporting the frame assembly 100. The frame assembly 100 includes a crossbeam assembly 110 and longitudinal beams 120 disposed at both ends of the crossbeam assembly 110. The lifting columns 200 include a telescopic assembly 220 and an iron box 211 disposed at the end of the telescopic assembly 220. As shown in Figures 2, 3, and 4, the iron box 211 is provided with several protrusions 211e, and the inner side of the crossbeam assembly 110 is provided with notches 111a that match the protrusions 211e. The protrusions 211e are stepped, narrow in front and wide in the back.

[0057] A locking assembly is provided on the front wall 211f of the iron box 211. The locking assembly comprises a locking wedge plate 213 connected to the front wall 211f via a plurality of elastic members 212. The force of the elastic members 212 is directed toward the opening of the iron box 211, causing the locking wedge plate 213 to move toward the opening of the iron box 211. Locking wings 213b are provided on both sides of the first wall 213c of the locking wedge plate 213, extending beyond the iron box sidewalls 211g. These locking wings 213b engage the locking grooves 111b of the crossbeam assembly 110, utilizing the principle of inclined planes to generate a horizontal force component. This forces the iron box 211 to move along the crossbeam 111, causing the protrusions 211e to engage the notches 111a, thereby locking the lifting column 200 to the frame assembly 100.

[0058] It should be noted that the protrusion 211e can be set on the iron box or on the crossbeam 111. It only needs to cooperate with the notch 111a to meet the requirements of the technical solution of the present invention. The protrusion 211e is preferably in the shape of a step with a narrow front and a wide back. Its shape only needs to meet the requirements of the technical solution of the present invention by being wedge-shaped with a narrow front and a wide back. There is no need to limit the protrusion 211e to a right-angled trapezoid. In addition, the locking groove 111b can be set independently on the crossbeam 111, as shown in Figure 4; the locking groove 111b can also be incorporated into the notch 111a, using the notch 111a as a locking groove, as shown in Figures 8(a) and 9(a). The notch 111a serves as a groove that cooperates with the protrusion 211e, and also serves as a locking groove for the locking wing 213b to be embedded. In order to avoid complex technical solutions, the present invention preferably describes the protrusion 211e being set on the iron box 211, and the notch 111a also serving as a locking groove. However, all the technical solutions mentioned in the above solutions are within the protection scope of the present invention.

[0059] As shown in conjunction with Figures 4 and 5 , in this embodiment, the elastic member 212 is a tension spring disposed within the iron box 211. The iron box 211 is provided with a first connecting portion 211a. The locking wedge plate 213 is provided with a second connecting portion 213a, which passes through a through hole 211b provided in the iron box 211. The ends of the elastic member 212 are respectively attached to the first connecting portion 211a and the second connecting portion 213a. As shown in Figure 5 , in one embodiment of the locking assembly, the first connecting portion 211a can be manufactured by directly punching a flange from the opening of the iron box 211. One end of the elastic member 212 can be attached to the flange. Since the elastic member 212 is subjected to tension and the iron box 212 has a lid covering the opening, the elastic member 212 is prevented from disengaging from the first connecting portion 211a. The second connecting portion 213a can also be manufactured by punching a flange from the locking wedge plate 213. The other end of the elastic member 212 is mounted on the second connecting portion 213a. As shown in FIG6 , another embodiment of the locking assembly comprises a waist opening provided on the second connecting portion 213a. The elastic member 212 is mounted within the waist opening to prevent the elastic member 212 from detaching from the second connecting portion 213a during use. Furthermore, the elastic member 212 mounted within the waist opening also serves to position the locking wedge plate 213 along the crossbeam, preventing the locking wedge plate 213 from detaching from the front wall 211f of the iron box 211.

[0060] The front wall of the iron box 211 is an inclined wall. The first wall 213c of the locking wedge plate 213 is aligned with the front wall of the iron box 211. Locking wings 213b are provided on both sides of the first wall 213c. The two locking wings 213b extend beyond the width of the iron box 211 and are embedded in the notches 111a of the crossbeam assembly 110. Under the action of the elastic member 212, the locking wedge plate 213 moves toward the opening of the iron box 211. At the same time, because the front wall 211f of the locking wedge plate 213 is an inclined wall, the locking wedge plate 213 generates a horizontal force component on the iron box 211, causing the iron box 211 to move along the crossbeam 111, thereby causing the protrusion 211e to mate with the notch 111a and tighten, achieving the purpose of locking.

[0061] The width of the through hole 211 b matches the width of the second connecting portion 213 a , and the through hole 211 b can play a role of limiting and guiding, so that the locking wedge plate 213 can only move in the direction of the force of the elastic member 212 .

[0062] The installation process of the lifting column 200 and the frame assembly 100 is described below with reference to Figures 8(a) and 8(b). When installing the lifting column 200 and the frame assembly 100, the frame assembly 100 should be placed flat on its lower side. The lifting column 200's iron box 211 should then be installed with the iron box 211 facing downward, positioning the protrusion 211e on the iron box 211 within the frame's notch 111a. At this point, because the locking wing 213b of the locking wedge plate 213 is wider than the inner dimension between the two crossbeams 111, the locking wing 213b rests on the left and right crossbeams 111. At this point, the lifting column 200 should be pressed down firmly to overcome the force of the elastic member 212, ensuring that the protrusion 211e is substantially flush with the bottom surface of the notch 111a. Finally, the lifting column 200 should be pushed firmly, inserting the protrusion 211e into the frame's notch 111a. As shown in Figures 9(a) and 9(b), when the lifting column 200 is pushed into place, the locking wing 213b of the locking wedge plate 213 is simultaneously pushed to the notch 111a and moves downward under the force of the elastic member 212. The locking wing 213b is inserted into the notch 111a, and under the action of the inclined plane principle, the iron box 211 and the beam 111 are tightened along the beam direction, thereby achieving the purpose of locking the lifting column 200 and the frame assembly 100.

[0063] In the prior art, Chinese patent CN107981540A discloses a quick-assembly table frame. Its technical solution is to provide beveled notches and matching beveled protrusions on the lifting columns and frame, and to install a crank wrench on the frame to press the lifting columns and frame together. However, this method has the disadvantage that the crank wrench needs to be installed separately. If the crank wrench is forgotten, there is a safety risk that the lifting columns and frame will become detached. In contrast, the technical solution of this embodiment includes a locking device on the lifting columns. When the lifting columns are placed in the frame, they are automatically locked, eliminating the need for additional installation steps and simplifying the installation process.

[0064] In the prior art, Chinese patent CN217565255U discloses a quick-install electric lift table. Its main technical solution is: a latching mechanism consisting of two sets of shafts and slots is provided on the lifting column, securing the lifting column and frame. Furthermore, a locking device is provided to prevent the lifting column and frame from disengaging. The locking device is provided in the lifting column and includes an elastic member disposed horizontally, with a force applied perpendicular to the crossbeam. Its main function is to lock the lifting column and frame, preventing the lifting column from disengaging from the frame. The two latching mechanisms require high positioning accuracy. If the positioning accuracy is not met, the lifting column will not be locked or locked tightly. Furthermore, the locking device cannot compensate for the gap between the shaft and slot that may occur due to wear. Compared to the prior art, the locking assembly provided on the lifting column in this embodiment directs the force of the elastic member toward the opening of the iron box, causing the iron box to generate a force along the crossbeam. This arrangement has the advantage that if a gap forms between the locking wing and the locking slot, the locking wedge plate, under the action of the elastic member, can move toward the iron box opening, adaptively eliminating the gap between the lifting column and the frame, achieving a better locking effect and making the lifting table frame more stable. As shown in FIG9 , after the lifting column 200 is locked with the frame assembly 100, the small end of the locking wedge plate 213 is continuously pulled into the notch 111a under the action of the elastic member 212, thereby continuously tightening the iron box 211.

[0065] Preferably, as shown in Figure 4, the locking wedge plate 213 includes a first wall 213c and locking wings 213b disposed on either side of the first wall 213c. The locking wings 213b are arranged at a certain angle with the first wall 213c, forming a wedge shape from an overall perspective. If the angle is too small, the inclined surface will be close to a vertical surface, failing to achieve the desired effect. If the angle is too large, the horizontal force generated by the inclined surface will be too small. Preferably, to further enhance the tensioning effect, the angle between the locking wings 213b and the first wall 213c is 5°-30°.

[0066] This embodiment discloses an unlocking method: As shown in FIG4 , an unlocking hole 211d and an unlocking support 211c are provided on the front wall 211f of the iron box 211. When unlocking is required, a suitable rod-shaped tool (such as a screwdriver) is inserted into the unlocking hole 211d and its end is placed on the unlocking support 211c. Using the unlocking support 211c as a fulcrum, the locking wedge plate 213 is pried upward to overcome the force of the elastic member 212, so that the locking wing 213b is disengaged from the notch 111a. Then, the lifting column 200 is pushed out of the frame assembly 100. This technical solution requires the use of a tool, and its main starting point is to increase the difficulty of unlocking, prevent mischievous children from unlocking the lifting column and frame too easily, and thus reduce safety risks.

[0067] In addition, this embodiment discloses another unlocking method, as shown in FIG7 . A lock wedge plate 213 is provided with an unlocking handle 213e that extends outward from a first wall 213c. By manually pulling the unlocking handle 213e upward and overcoming the force of the elastic member 212, the lock wedge plate 213 is moved upward, disengaging the locking wing 213b from the notch 111a. The lifting column 200 can then be pushed out of the frame assembly 100. This technical solution allows the lifting column 200 and the frame assembly 100 to be separated manually without any tools, making disassembly more convenient.

[0068] Preferably, the locking wedge plate 213 is made of metal and is manufactured by stamping. The second connecting portion 213 a , the locking wing 213 b and the unlocking handle 213 e can all be manufactured by stamping.

[0069] In addition, the locking wedge plate 213 can also be made by injection molding, and its second connecting portion 213a, locking wing portion 213b and unlocking handle 213e can be directly injection molded by a mold. The specific type of plastic can be selected from PBT, ABS, PA66 and other materials.

[0070] Preferably, as described above, both the installation and removal of the lifting column and the frame require pushing the lifting column. Referring to Figures 8 and 9 , during the pushing process, the locking wing 213b rests on the beam 111, causing sliding between the locking wing 213b and the surface of the beam 111, which can easily scratch the paint on the beam 111. Therefore, the locking wing 213b is provided with a rounded corner 213d on its underside, as shown in Figure 4 . With the rounded corners on the locking wing 213b, its arc surface contacts the beam surface, effectively reducing scratches on the plastic powder on the beam surface.

[0071] Example 2

[0072] As shown in Figure 6 , this embodiment differs from the first embodiment in that the elastic member 212 is a compression spring, the front wall 211f of the iron box 211 is a straight wall, the first wall 213c of the locking wedge plate 213 abuts against the front wall 211f, and locking wings 213b are provided at both ends of the locking wedge plate 213, forming a certain angle with the first wall 213c. The ends of the elastic member 212 are connected to the first connecting portion 211a and the second connecting portion 213a, respectively. Under the action of the elastic member 212, the locking wedge plate 213 moves toward the iron box opening, and the locking wings 213b are inserted into the locking grooves 111b, thereby tightening the iron box 211.

[0073] Combining the above two embodiments, as shown in FIG4 , the preferred number of elastic members 212 is two, and the elastic members 212 are disposed inside the iron box 211 and close to both sides of the front wall 211f. This arrangement allows the elastic members 212 to apply force to the locking wings 213b at both ends of the locking wedge plate 213, respectively, making the force more uniform.

[0074] In addition, in order to enhance the rapid installation effect of the lifting columns and the frame and further optimize the user experience, the present invention optimizes the frame structure, as shown in Figures 10 to 13.

[0075] As shown in Figure 10, the crossbeam assembly 110 includes two parallel crossbeams 111, a connector 112 positioned between the two crossbeams 111, and connectors 112 secured to the ends of the two crossbeams 111. The two connectors 112 removably secure the two crossbeams 111 together. This modular frame allows the crossbeams 111 to be secured together via the two connectors 112, making installation very convenient. The modular design reduces the number of welding steps required for the frame, lowering manufacturing costs, while also reducing packaging volume and shipping costs.

[0076] As shown in Figures 11 and 12, the connecting member 112 is provided with a first bayonet portion 112c adapted to the size of the beam 111. The connecting member 112 is also provided with a first undercut 112a, and the beam 111 is provided with a slot 111c adapted to the first undercut 112a.

[0077] Preferably, as shown in FIG10 , the connector 112 may be provided with a first bayonet portion 112 c larger than the crossbeam 111 , and a locking insert 113 is provided between the first bayonet portion 112 c and the crossbeam 111 . The locking insert 113 can tighten the crossbeam 111 and the connector 112 .

[0078] As shown in Figure 13, the locking tab 113 has a second undercut 113a, and the connector 112 has a snap-fit ​​notch 112b that fits into the second undercut 113a. The locking tab 113 is made of plastic, and the second undercut 113a can be inserted into the first snap-fit ​​notch 112c during installation, leveraging the inherent elasticity of the plastic. This second undercut 113a effectively prevents the locking tab 113 from falling out due to the various swinging movements of the lift table during use.

[0079] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A quick-assembly table frame connection structure, comprising a frame assembly (100) and a plurality of lifting columns (200) supporting the frame assembly (100). The frame assembly (100) includes a crossbeam assembly (110) and a longitudinal beam (120) connected to the crossbeam assembly (110). The lifting column (200) comprises a telescopic assembly (220) and an iron box (211) provided at the end of the telescopic assembly (220), wherein the iron box (211) is provided between two beams (111) of the beam assembly (110). A plurality of step-shaped protrusions (211e) are provided on either the side wall (211g) of the iron box (211) or the inner wall of the crossbeam assembly (110), while the other one is provided with a notch (111a) adapted to the protrusions (211e). A locking assembly is provided on the front wall (211f) of the iron box (211), characterized in that: The locking assembly is a locking wedge plate (213) connected to the front wall (211f) through a plurality of elastic members (212), the action force of the elastic member (212) is directed toward the opening of the iron box (211), and locking wings (213b) extending beyond the side walls (211g) are provided on both sides of the first wall (213c) of the locking wedge plate (213), and the locking wings (213b) are embedded in the locking groove (111b) of the beam assembly (110), so that the protrusion (211e) fits into the notch (111a), thereby locking the lifting column (200) on the frame assembly (100).

2. The quick-assembly table frame connection structure according to claim 1, characterized in that: The iron box (211) is provided with a first connecting portion (211a), the locking wedge plate (213) is provided with a second connecting portion (213a), and both ends of the elastic member (212) are respectively connected to the first connecting portion (211a) and the second connecting portion (213a).

3. The quick-assembly table frame connection structure according to claim 2, characterized in that: The second connecting portion (213a) is also provided with a waist opening.

4. The quick-assembly table frame connection structure according to claim 2, characterized in that: The front wall (211f) is provided with a through hole (211b) adapted to the second connecting portion (213a), and the second connecting portion (213a) penetrates into the iron box (211) through the through hole (211b).

5. The quick-assembly table frame connection structure according to claim 1, characterized in that: The locking wing portion (213b) forms a certain angle with the first surface wall (213c).

6. The quick-assembly table frame connection structure according to claim 5, characterized in that: The angle is 5°-30°.

7. The quick-assembly table frame connection structure according to claim 1, characterized in that: The locking groove (111b) is an independent groove or is combined with the notch (111a) into one groove.

8. The quick-assembly table frame connection structure according to claim 1, characterized in that: The front wall (211f) is an inclined wall extending toward the outside of the opening of the iron box (211); the first wall (213c) of the locking wedge plate (213) is in contact with the front wall (211f); the locking wing (213b) has a locking surface facing vertically downward; and the locking wing (213b) is embedded in the locking groove (111b) of the crossbeam assembly (110).

9. The quick-assembly table frame connection structure according to claim 1, characterized in that: The front wall (211f) is a vertical wall pointing vertically downward, the first surface wall (213c) of the locking wedge plate (213) is in contact with the front wall (211f), the locking wing (213b) is an inclined surface, and the locking wing (213b) is embedded in the locking groove (111b) of the beam assembly (110).

10. The quick-assembly table frame connection structure according to claim 1, characterized in that: The lower side of the locking wing (213b) is provided with a rounded corner (213d).

11. The quick-assembly table frame connection structure according to claim 1, characterized in that: The locking wedge plate (213) is made of metal or plastic.

12. The quick-assembly table frame connection structure according to claim 1, characterized in that: The elastic member (212) is a tension spring or a compression spring.

13. The quick-assembly table frame connection structure according to claim 1, characterized in that: The number of the elastic members (212) is 2, and the elastic members (212) are arranged at both ends of the inner side of the front wall (211f).

14. The quick-assembly table frame connection structure according to claim 1, characterized in that: The front wall (211f) is provided with an unlocking hole (211d) and an unlocking support (211c).

15. The quick-assembly table frame connection structure according to claim 1, characterized in that: The locking wedge plate (213) is provided with an unlocking handle (213e).

16. The quick-assembly table frame connection structure according to claim 1, characterized in that: The crossbeam assembly (110) comprises two crossbeams (111) arranged in parallel, a connecting piece (112) clamped between the two crossbeams (111), and a connecting piece (112) clamped to the ends of the two crossbeams (111), wherein the connecting piece (112) detachably fixes the two crossbeams (111) into one body.

17. The quick-assembly table frame connection structure according to claim 16, characterized in that: The connecting member (112) is provided with a first bayonet portion (112c) adapted to the size of the crossbeam (111); a first undercut (112a) is protruded from an outer vertical wall of the first bayonet portion (112c) on the connecting member (112); and a slot (111c) adapted to the first undercut (112a) is provided on the outer side wall of the crossbeam (111).

18. The quick-assembly table frame connection structure according to claim 17, characterized in that: The width of the first bayonet portion (112c) is greater than the width of the crossbeam (111), and a locking insert (113) is provided between the first bayonet portion (112c) and the crossbeam (111).

19. The quick-assembly table frame connection structure according to claim 18, characterized in that: The locking insert (113) is provided with a second undercut (113a), and the connecting piece (112) is provided with a bayonet (112b) adapted to the second undercut (113a).

20. An electric lift table, characterized by: The electric lift table adopts the quick-assembly table frame connection structure according to any one of claims 1 to 19.

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