Circular three-section electric column lifter

Abstract

The present application relates to electric column technical field, especially to round three section electric column lifter, including column inner tube, column intermediate pipe and column outer tube, and the rotating lifting mechanism of connecting column inner tube, column intermediate pipe and column outer tube, the rotating lifting mechanism is used for converting circumferential rotation into axial movement, through rotating lifting mechanism drives column inner tube and column intermediate pipe along the axis movement of column outer tube, rotating lifting mechanism is provided with column inner tube fixed sleeve between column inner tube, through column inner tube fixed sleeve circumferential fixation is carried out to column inner tube, the relative circumferential rotation of column inner tube and rotating lifting mechanism is limited, in the present application, through the cooperation connection of column inner tube fixed sleeve and column intermediate pipe fixed sleeve and lifter, the circumferential rotation of column inner tube, column intermediate pipe is limited, relative to the cost of traditional round pipe type column lifter is lower, processing is more convenient, and it is suitable for popularization and use.

Description

Technical Field

[0001] This invention relates to the field of electric column technology, and more particularly to a three-section electric column lifter. Background Technology

[0002] Electric column lifters are widely used in home, medical and other fields. A column lifter generally consists of an inner tube, a middle tube, an outer tube and a drive device, which are installed sequentially from the inside to the outside. In order to ensure the strength and rigidity of the column lifter, the tubes are generally made of metal.

[0003] Common column lifters typically use square or round tubes. Round tubes, with their smooth outer walls and lack of sharp edges, are more aesthetically pleasing and therefore more popular with consumers. Round tube column lifters on the market generally use welded ribs or grooves on the inner wall of the tube, along with grooved or ribbed friction plates, to restrict the column's circumferential rotation. Figure 20 For friction plates, Figure 21 The inner wall grooved round tube is connected to a friction plate (the friction plate has raised ribs that engage with the grooves) to prevent the inner wall grooved round tube from rotating circumferentially. However, the inner wall grooved (inner wall welded) round tube is inconvenient to process and has a high production cost, which affects the promotion and use of the round tube type column lifter. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a circular three-section electric column lifter.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A three-section electric column lifter includes an inner column tube, a middle column tube, and an outer column tube, as well as a rotating lifting mechanism connecting the inner column tube, the middle column tube, and the outer column tube. The rotating lifting mechanism converts circumferential rotation into axial movement, driving the inner column tube and the middle column tube to move along the axis of the outer column tube. A column inner tube fixing sleeve is provided between the rotating lifting mechanism and the inner column tube to circumferentially fix the inner column tube, restricting the relative circumferential rotation between the inner column tube and the rotating lifting mechanism. A column middle tube fixing sleeve is provided between the rotating lifting mechanism and the middle column tube to circumferentially and axially fix the middle column tube, restricting the relative circumferential rotation between the middle column tube and the rotating lifting mechanism, and allowing the middle column tube to move synchronously axially with the rotating lifting mechanism.

[0007] Preferably, the column inner tube fixing sleeve includes a first base plate and a first sleeve, which are integrally formed. A first locking block is provided on the outer wall of the first sleeve, and a first locking groove adapted to the first locking block is provided at the lower end of the column inner tube. The axial movement of the column inner tube relative to the column inner tube fixing sleeve is restricted by the cooperation of the first locking block, the first base plate and the first locking groove. A first boss is provided at the edge of the upper surface of the first base plate, and a first limiting groove adapted to the first boss is provided at the lower end of the column inner tube. The circumferential movement of the column inner tube relative to the column inner tube fixing sleeve is restricted by the cooperation of the first boss and the first limiting groove. A first through hole adapted to the outer wall of the rotary lifting mechanism is opened on the first base plate. The circumferential movement of the column inner tube fixing sleeve relative to the rotary lifting mechanism is restricted by the first through hole.

[0008] The column intermediate tube fixing sleeve includes a second base plate, a second sleeve, and a third sleeve, which are integrally formed. A second locking block is provided on the outer wall of the second sleeve, and a third locking block is provided on the inner wall of the third sleeve. A second through hole is provided on the second base plate for the rotation and lifting mechanism to pass through. A second locking groove adapted to the second locking block is provided at the lower end of the column intermediate tube. The axial movement of the column intermediate tube relative to the column intermediate tube fixing sleeve is restricted by the cooperation of the second locking block, the second base plate, and the second locking groove. The upper surface of the second base plate... A second protrusion is provided at the edge of the column, and a second limiting groove adapted to the second protrusion is provided at the lower end of the column middle tube. The circumferential movement of the column middle tube relative to the column middle tube fixing sleeve is restricted by the cooperation of the second protrusion and the second limiting groove. A third slot adapted to the third locking block is provided at the lower end of the outer wall of the rotary lifting mechanism. The axial movement of the column middle tube fixing sleeve relative to the rotary lifting mechanism is restricted by the cooperation of the third locking block, the second base plate and the third slot. The circumferential movement of the column middle tube fixing sleeve relative to the rotary lifting mechanism is restricted by the second through hole.

[0009] Preferably, the rotary lifting mechanism includes a lead screw, a lead screw nut, a lifting device outer sleeve, a hollow lead screw, a hollow lead screw nut, and a hollow lead screw outer sleeve. The lead screw is coaxially arranged with the inner tube of the column. The upper end of the lead screw extends to the outside of the inner tube of the column. A lead screw limiting mechanism is installed at the upper end of the inner tube of the column, which ensures that the lead screw can only rotate along the axis of the inner tube of the column. A lead screw nut that mates with the lead screw is installed on the inner wall of the upper end of the lifting device outer sleeve. A lead screw guide sleeve is fixedly installed at the lowermost end of the lead screw. The sleeve mates with the inner wall of the hollow lead screw, and drives the hollow lead screw to rotate synchronously through the lead screw guide sleeve. The lower end of the hollow lead screw is equipped with a hollow lead screw guide sleeve, and the outer wall of the hollow lead screw guide sleeve is adapted to the inner wall of the hollow lead screw outer sleeve. The upper end of the hollow lead screw outer sleeve is fixedly installed with a hollow lead screw nut that mates with the hollow lead screw. The lower end of the hollow lead screw outer sleeve is fixedly connected to the outer tube of the column. The outer wall of the hollow lead screw nut is adapted to the inner wall of the lifting device outer sleeve, and the hollow lead screw nut restricts the circumferential rotation of the lifting device outer sleeve.

[0010] The third slot is located on the outer tube of the elevator.

[0011] Preferably, the outer wall of the first sleeve is provided with a uniformly distributed first rib, the first rib is parallel to the axis of the first sleeve, and the lower end of the inner tube of the column is provided with a first notch for the first rib to pass through, the free end of the first rib passes through the first notch and contacts the inner wall of the middle tube of the column.

[0012] The outer wall of the second sleeve is provided with evenly distributed second ribs, which are parallel to the axis of the second sleeve. The lower end of the column middle tube is provided with a second notch for the second ribs to pass through. The free end of the second ribs passes through the second notch and contacts the inner wall of the column outer tube.

[0013] Preferably, the inner tube fixing sleeve of the column has a first through groove that penetrates the first sleeve and the first rib; the middle tube fixing sleeve of the column has a second through groove that penetrates the second sleeve and the second rib.

[0014] Preferably, the hollow lead screw has uniformly distributed grooves on its inner wall along its axial direction, and the lead screw guide sleeve has a slider on its side wall, the slider being adapted to the groove.

[0015] Preferably, an outer tube gasket is welded to the lower end of the inner wall of the column outer tube. The outer tube gasket is fixedly connected to the lower end of the hollow screw outer tube through a tube plug. The screw limiting mechanism is a square box set at the top of the column inner tube. The upper end of the screw extends into the inside of the square box. A screw bearing adapted to the screw is installed on the square box.

[0016] Preferably, a clamping plate is installed at the lower end of the lead screw nut by screws, and a hollow lead screw nut bearing is installed between the clamping plate and the lead screw nut. The outer ring of the hollow lead screw nut bearing is clamped between the clamping plate and the lead screw nut, and the inner ring of the hollow lead screw nut bearing is fixedly connected to the hollow lead screw.

[0017] Preferably, a guide sleeve for the intermediate tube of the column is installed at the top end of the intermediate tube of the column, the inner wall of the guide sleeve of the intermediate tube of the column is adapted to the outer wall of the inner tube of the column, and a guide sleeve for the outer tube of the column is installed at the top end of the outer tube of the column, the inner wall of the guide sleeve of the outer tube of the column is adapted to the outer wall of the intermediate tube of the column.

[0018] Both the intermediate tube guide sleeve and the outer tube guide sleeve of the column are provided with evenly distributed guide mechanisms. The guide mechanism on the intermediate tube guide sleeve of the column is adapted to the outer wall of the inner tube of the column, and the guide mechanism on the outer tube guide sleeve of the column is adapted to the outer wall of the intermediate tube of the column.

[0019] The guiding mechanism includes a guide block and a guide block mounting plate. The end face of the guide block is adapted to the inner wall of the inner tube of the column or the inner wall of the guide sleeve of the intermediate tube of the column. The guide block is equipped with two corresponding springs inside, and the axis of the springs is perpendicular to the axis of the guide sleeve of the intermediate tube of the column. The guide block is also equipped with two corresponding columnar cavities inside, which are located inside the springs. The guide sleeve of the intermediate tube of the column and the guide sleeve of the outer tube of the column are both provided with sliding grooves adapted to the guide block mounting plate. The guide block mounting plate can slide along the radial direction of the guide sleeve of the intermediate tube of the column or the radial direction of the guide sleeve of the outer tube of the column through the sliding grooves. An elastic block is fixedly installed on the end face of the guide block mounting plate away from the guide block. The intermediate tube of the column and the outer tube of the column are both provided with elastic block mounting grooves adapted to the elastic blocks.

[0020] Preferably, a plug is provided on the guide block in the area between the columnar cavities, the plug is sealed to the guide block, the end of the plug is fixedly connected to the guide block mounting plate, and the inside of the columnar cavity is a vacuum.

[0021] The beneficial effects of this invention are:

[0022] 1. The inner tube fixing sleeve and the middle tube fixing sleeve of the column have raised ribs on their surfaces. The raised ribs have through grooves and hollowed-out bottoms. This design serves two purposes: firstly, it can store oil for lubrication; secondly, the raised ribs have a certain degree of elasticity, allowing the inner tube of the column to better fit with the middle tube of the column, and the middle tube of the column to better fit with the outer tube of the column. This compensates for errors in the tube fitting and makes tables and other items with this lifting device more stable.

[0023] 2. The column inner tube fixing sleeve is equivalent to the combination of the friction plate and the column inner tube fixing component. The column inner tube fixing sleeve is installed at one end of the column inner tube and is fixed axially and circumferentially. The inner hole is rectangular or polygonal and cooperates with the lifting device outer tube, thereby restricting the relative circumferential rotation of the column inner tube and the lifting device outer tube.

[0024] 3. The column intermediate tube fixing sleeve is equivalent to the combination of friction plate and column intermediate tube fixing component. The column intermediate tube fixing sleeve is installed at one end of the column intermediate tube and is fixed axially and circumferentially. The inner hole is rectangular or polygonal and has fastening points. It matches the opening of the lifting device outer tube, drives the column intermediate tube to move axially, and restricts the relative circumferential rotation between the column intermediate tube and the lifting device outer tube.

[0025] 4. In this invention, the inner tube fixing sleeve and the middle tube fixing sleeve of the column are connected with the lifting device to restrict the circumferential rotation of the inner tube and the middle tube of the column. Compared with the traditional round tube type column lifting device, the cost is lower and the processing is more convenient, making it suitable for widespread use.

[0026] 5. In traditional lifting devices, the guide sleeves of the column middle tube and the column outer tube can improve the stability of the lifting device during movement and reduce noise. However, as the guide sleeves of the column middle tube and the column outer tube wear, the gap between the column inner tube and the column middle tube or the column middle tube becomes larger, affecting the stability of the lifting device and generating noise. In this invention, both the column middle tube guide sleeve and the column outer tube guide sleeve are equipped with a guiding mechanism. After the guide block is worn, the elastic block can push the guide block to move, so that the guide block can guide the column inner tube or the column middle tube, fill the gap, and the spring and the columnar cavity can make the end of the guide block move closer to the middle, so that the guide block undergoes radial expansion, further filling the gap between the guide block and the column inner tube or the column middle tube, so that the lifting device can operate smoothly and quietly. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the main cross-section of the circular three-section electric column lifter proposed in this invention;

[0028] Figure 2 The circular three-section electric column lifter proposed in this invention Figure 1 Enlarged structural diagram at point A in the middle;

[0029] Figure 3 The circular three-section electric column lifter proposed in this invention Figure 1 Enlarged structural diagram at point B;

[0030] Figure 4 The circular three-section electric column lifter proposed in this invention Figure 1 Enlarged structural diagram at point C;

[0031] Figure 5 The circular three-section electric column lifter proposed in this invention Figure 1 Enlarged structural diagram at point D;

[0032] Figure 6 This is a three-dimensional structural diagram of the inner tube fixing sleeve of the circular three-section electric column lifter proposed in this invention.

[0033] Figure 7 This is a top view of the inner tube fixing sleeve of the circular three-section electric column lifter proposed in this invention.

[0034] Figure 8 This is a schematic diagram of the main structure of the inner tube fixing sleeve of the circular three-section electric column lifter proposed in this invention.

[0035] Figure 9 The circular three-section electric column lifter proposed in this invention Figure 8 A cross-sectional view of the EE structure;

[0036] Figure 10 This is a three-dimensional structural diagram of the fixing sleeve of the middle tube of the circular three-section electric column lifter proposed in this invention;

[0037] Figure 11 This is a top view of the fixing sleeve of the middle tube of the circular three-section electric column lifter proposed in this invention.

[0038] Figure 12 This is a schematic diagram of the main structure of the fixing sleeve of the middle tube of the circular three-section electric column lifter proposed in this invention.

[0039] Figure 13 The circular three-section electric column lifter proposed in this invention Figure 12 A schematic diagram of the cross-sectional structure of FF;

[0040] Figure 14 This is a three-dimensional structural diagram of the column intermediate tube proposed in this invention;

[0041] Figure 15 This is a three-dimensional structural diagram of the hollow lead screw nut proposed in this invention;

[0042] Figure 16 This is a three-dimensional structural diagram of the guide sleeve for the intermediate tube of the column proposed in this invention;

[0043] Figure 17 This is a schematic diagram of the main structure of the guide sleeve for the intermediate tube of the column proposed in this invention;

[0044] Figure 18 The guide sleeve for the intermediate tube of the column proposed in this invention Figure 17 A cross-sectional view of the GG structure;

[0045] Figure 19 The present invention proposes Figure 18 Enlarged structural diagram at point H;

[0046] Figure 20 This is a schematic diagram of the structure of the friction plate in the prior art proposed by the present invention;

[0047] Figure 21 This is a schematic diagram of the structure of a grooved circular tube in the prior art proposed by this invention.

[0048] In the diagram: 1. Lead screw, 2. Lead screw nut, 3. Lifter outer sleeve, 4. Column inner tube fixing sleeve, 5. Column inner tube, 6. Hollow lead screw, 7. Hollow lead screw nut, 8. Hollow lead screw outer sleeve, 9. Hollow lead screw guide sleeve, 10. Pipe plug, 11. Column intermediate tube fixing sleeve, 12. Column intermediate tube, 13. Column outer tube, 14. Square box, 15. Column intermediate tube guide sleeve, 16. Column outer tube guide sleeve, 17. Lead screw guide sleeve, 18. Outer tube gasket, 19. Hollow lead screw 20. Rod nut bearing, 21. Clamping block, 22. Guide mechanism, 33. Friction plate, 34. Grooved inner wall tube, 45. First locking block, 46. First rib, 47. First through groove, 48. First boss, 19. Second locking block, 10. Second rib, 111. Second through groove, 112. Third locking block, 113. Second boss, 214. Guide block, 215. Guide block mounting plate, 216. Plug, 217. Elastic block, 218. Columnar cavity, 219. Spring. Detailed Implementation

[0049] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] Reference Figure 1-19 A three-section electric column lifter includes an inner column tube 5, a middle column tube 12, and an outer column tube 13, as well as a rotary lifting mechanism connecting the inner column tube 5, the middle column tube 12, and the outer column tube 13. The rotary lifting mechanism converts circumferential rotation into axial movement. The inner column tube 5 and the middle column tube 12 move along the axis of the outer column tube 13 via the rotary lifting mechanism. An inner column tube fixing sleeve 4 is provided between the rotary lifting mechanism and the inner column tube 5 to fix the inner column tube 5 circumferentially, restricting the relative circumferential rotation between the inner column tube 5 and the rotary lifting mechanism. A middle column tube fixing sleeve 11 is provided between the rotary lifting mechanism and the middle column tube 12 to fix the middle column tube 12 circumferentially and axially, restricting the relative circumferential rotation between the middle column tube 12 and the rotary lifting mechanism, and allowing the middle column tube 12 to move synchronously axially with the rotary lifting mechanism.

[0051] The column inner tube fixing sleeve 4 includes a first base plate and a first sleeve, which are integrally formed. A first locking block 41 is provided on the outer wall of the first sleeve. A first locking groove adapted to the first locking block 41 is provided at the lower end of the column inner tube 5. The axial movement of the column inner tube 5 relative to the column inner tube fixing sleeve 4 is restricted by the cooperation of the first locking block 41, the first base plate and the first locking groove. A first boss 44 is provided at the edge of the upper surface of the first base plate. A first limiting groove adapted to the first boss 44 is provided at the lower end of the column inner tube 5. The circumferential movement of the column inner tube 5 relative to the column inner tube fixing sleeve 4 is restricted by the cooperation of the first boss 44 and the first limiting groove. A first through hole adapted to the outer wall of the rotary lifting mechanism is provided on the first base plate. The circumferential movement of the column inner tube fixing sleeve 4 relative to the rotary lifting mechanism is restricted by the first through hole.

[0052] The column intermediate tube fixing sleeve 11 includes a second base plate, a second sleeve, and a third sleeve, which are integrally formed. A second locking block 111 is provided on the outer wall of the second sleeve, and a third locking block 114 is provided on the inner wall of the third sleeve. A second through hole for the rotation and lifting mechanism to pass through is provided on the second base plate. A second locking groove adapted to the second locking block 111 is provided at the lower end of the column intermediate tube 12. Through the cooperation of the second locking block 111, the second base plate, and the second locking groove, the axial movement of the column intermediate tube 12 relative to the column intermediate tube fixing sleeve 11 is restricted. A [further details about the second base plate and its edge are missing]. A second boss 115 is provided, and a second limiting groove adapted to the second boss 115 is provided at the lower end of the column intermediate tube 12. The second boss 115 and the second limiting groove cooperate to restrict the circumferential movement of the column intermediate tube 12 relative to the column intermediate tube fixing sleeve 11. A third slot adapted to the third locking block 114 is provided at the lower end of the outer wall of the rotary lifting mechanism. The axial movement of the column intermediate tube fixing sleeve 11 relative to the rotary lifting mechanism is restricted by the cooperation of the third locking block 114, the second base plate and the third slot. The circumferential movement of the column intermediate tube fixing sleeve 11 relative to the rotary lifting mechanism is restricted by the second through hole.

[0053] The rotary lifting mechanism includes a lead screw 1, a lead screw nut 2, a lifting device outer sleeve 3, a hollow lead screw 6, a hollow lead screw nut 7, and a hollow lead screw outer sleeve 8. The lead screw 1 is coaxially arranged with the inner tube 5 of the column, and its upper end extends to the outside of the inner tube 5. A lead screw limiting mechanism is installed at the upper end of the inner tube 5, which ensures that the lead screw 1 can only rotate along the axis of the inner tube 5. A lead screw nut 2 that mates with the lead screw 1 is installed on the inner wall of the upper end of the lifting device outer sleeve 3. A lead screw guide sleeve 17 is fixedly installed at the lower end of the lead screw 1, and it mates with the inner wall of the hollow lead screw 6. The hollow lead screw 6 rotates synchronously through the lead screw guide sleeve 17. A hollow lead screw is installed at the lower end of the hollow lead screw 6. The guide sleeve 9 has an outer wall that is adapted to the inner wall of the hollow screw outer tube 8. Specifically, the lower end of the hollow screw 6 can be fixedly connected to the hollow screw guide sleeve 9, and the hollow screw guide sleeve 9 is rotatably engaged with the inner wall of the hollow screw outer tube 8; or the lower end of the hollow screw 6 can be rotatably connected to the hollow screw guide sleeve 9, and the hollow screw guide sleeve 9 is slidably engaged with the inner wall of the hollow screw outer tube 8. The upper end of the hollow screw outer tube 8 is fixedly installed with a hollow screw nut 7 that mates with the hollow screw 6. The lower end of the hollow screw outer tube 8 is fixedly connected to the column outer tube 13. The outer wall of the hollow screw nut 7 is adapted to the inner wall of the lifting device outer tube 3, and the hollow screw nut 7 restricts the circumferential rotation of the lifting device outer tube 3.

[0054] The third slot is located on the outer sleeve 3 of the elevator.

[0055] The outer wall of the first sleeve is provided with evenly distributed first ribs 42. The first ribs 42 are parallel to the axis of the first sleeve. The lower end of the inner tube 5 of the column is provided with a first notch for the first ribs 42 to pass through. The free end of the first ribs 42 passes through the first notch and contacts the inner wall of the middle tube 12 of the column.

[0056] The outer wall of the second sleeve is provided with evenly distributed second ribs 112. The second ribs 112 are parallel to the axis of the second sleeve. The lower end of the column middle tube 12 is provided with a second notch for the second ribs 112 to pass through. The free end of the second ribs 112 passes through the second notch and contacts the inner wall of the column outer tube 13.

[0057] The inner tube fixing sleeve 4 of the column has a first through groove 43 that passes through the first sleeve and the first rib 42; the middle tube fixing sleeve 11 of the column has a second through groove 113 that passes through the second sleeve and the second rib 112.

[0058] The hollow lead screw 6 has uniformly distributed grooves on its inner wall along its axial direction, and a slider is provided on the side wall of the lead screw guide sleeve 17, which is adapted to the groove.

[0059] An outer tube gasket 18 is welded to the lower end of the inner wall of the column outer tube 13. The outer tube gasket 18 is fixedly connected to the lower end of the hollow screw outer tube 8 through the tube plug 10.

[0060] The lead screw limiting mechanism is a square box 14 located at the top of the inner tube 5 of the column. The upper end of the lead screw 1 extends into the interior of the square box 14, and a lead screw bearing adapted to the lead screw 1 is installed on the square box 14.

[0061] A clamping plate 20 is installed at the lower end of the lead screw nut 2 by screws. A hollow lead screw nut bearing 19 is installed between the clamping plate 20 and the lead screw nut 2. The outer ring of the hollow lead screw nut bearing 19 is clamped between the clamping plate 20 and the lead screw nut 2. The inner ring of the hollow lead screw nut bearing 19 is fixedly connected to the hollow lead screw 6. The setting of the hollow lead screw nut bearing 19 makes the hollow lead screw 6 and the lead screw nut 2 move synchronously, avoiding the lead screw nut 2 from being impacted by the hollow lead screw 6.

[0062] The top end of the column intermediate tube 12 is equipped with a column intermediate tube guide sleeve 15, the inner wall of the column intermediate tube guide sleeve 15 is adapted to the outer wall of the column inner tube 5, and the top end of the column outer tube 13 is equipped with a column outer tube guide sleeve 16, the inner wall of the column outer tube guide sleeve 16 is adapted to the outer wall of the column intermediate tube 12.

[0063] Both the intermediate tube guide sleeve 15 and the outer tube guide sleeve 16 of the column are provided with evenly distributed guide mechanisms 21. The guide mechanism 21 on the intermediate tube guide sleeve 15 of the column is adapted to the outer wall of the inner tube 5 of the column, and the guide mechanism 21 on the outer tube guide sleeve 16 of the column is adapted to the outer wall of the intermediate tube 12 of the column.

[0064] The guiding mechanism 21 includes a guide block 211 and a guide block mounting plate 212. The end face of the guide block 211 is adapted to the inner wall of the inner tube 5 of the column or the inner wall of the guide sleeve 15 of the intermediate tube of the column. Two corresponding springs 216 are provided inside the guide block 211. The axis of the springs 216 is perpendicular to the axis of the guide sleeve 15 of the intermediate tube of the column. Two corresponding cylindrical cavities 215 are also provided inside the guide block 211. The cylindrical cavities 215 are located inside the springs 216. Both the intermediate tube guide sleeve 15 and the outer tube guide sleeve 16 of the column are provided with sliding grooves that are compatible with the guide block mounting plate 212. The guide block mounting plate 212 can slide along the radial direction of the intermediate tube guide sleeve 15 or the radial direction of the outer tube guide sleeve 16 of the column through the sliding grooves. An elastic block 214 is fixedly installed on the end face of the guide block mounting plate 212 away from the guide block 211. Both the intermediate tube 12 and the outer tube 13 of the column are provided with elastic block mounting grooves that are compatible with the elastic block 214.

[0065] A plug 213 is provided on the guide block 211 in the area between the cylindrical cavities 215. The plug 213 is sealed to the guide block 211. The end of the plug 213 is fixedly connected to the guide block mounting plate 212. The interior of the cylindrical cavity 215 is vacuum-shaped. The vacuum design is to increase the force that pulls the end of the guide block 211 toward the center. The cylindrical cavity 215 is located inside the spring 216. The spring 216 can support the guide block 211 and prevent the guide block 211 from collapsing radially.

[0066] The guide block 211 is made of a material with a certain elasticity, such as thermoplastic elastomer. When the guide mechanism 21 is produced, the spring 216 is placed in the mold in advance, and the guide block 211 with columnar cavity 215 is directly injection molded. Then, the columnar cavity 215 is vacuumed, sealed with glue, and the plug block 213 is installed. (The plug block 213, the guide block mounting plate 212 and the elastic block 214 are pre-fixed and connected).

[0067] During assembly, the natural elongation of the elastic block 214 must be greater than the depth of the elastic block mounting groove. During operation, after the guide block 211 is worn, the elastic block 214 resets and can push the guide block 211 to move (the guide block mounting plate 212 can slide along the radial direction of the column intermediate tube guide sleeve 15 or the column outer tube guide sleeve 16 through the sliding groove, thereby driving the guide block 211 to move), so that the guide block 211 can guide the column inner tube 5 or the column intermediate tube 12, fill the gap, and the spring 216 and the columnar cavity 215 can cause the end of the guide block 211 to move closer to the middle, so that the guide block 211 expands radially, further filling the gap between the guide block 211 and the column inner tube 5 or the column intermediate tube 12, so that the lifting device can operate smoothly and quietly.

[0068] Working principle: The end of the lead screw 1 is connected to the motor. The rotation of the motor drives the lead screw 1 to rotate. Since the lead screw nut 2 is fixed, the lead screw 1 drives the inner tube 5 of the column to rise and fall. At the same time, the lead screw 1 drives the hollow lead screw 6 to rotate through the lead screw guide sleeve 17. Since the hollow lead screw nut 7 is fixed, the hollow lead screw 6 drives the outer tube 3 of the lifting device to rise and fall. The outer tube 3 of the lifting device is connected to the middle tube 12 of the column through the fixing sleeve 11 of the middle tube of the column. The rise and fall of the outer tube 3 of the lifting device drives the middle tube 12 of the column to rise and fall, thereby completing the raising and lowering of the column.

[0069] The column inner tube fixing sleeve 4 is equivalent to a combination of friction plate and column inner tube fixing component. The column inner tube fixing sleeve 4 is installed at one end of the column inner tube 5 and is fixed axially and circumferentially. The inner hole is rectangular or polygonal and cooperates with the lifting device outer tube 3, thereby restricting the relative circumferential rotation of the column inner tube 5 and the lifting device outer tube 3.

[0070] The column intermediate tube fixing sleeve 11 is equivalent to the combination of friction plate and column intermediate tube fixing component. The column intermediate tube fixing sleeve 11 is installed at one end of column intermediate tube 12 and is fixed axially and circumferentially. The inner hole is rectangular or polygonal and has fastening points. It cooperates with the opening of the lifting device outer tube 3, drives the column intermediate tube 12 to move axially, and restricts the relative circumferential rotation of column intermediate tube 12 and lifting device outer tube 3.

[0071] The inner tube fixing sleeve 4 and the middle tube fixing sleeve 11 of the column have raised ribs on their surfaces. The raised ribs have through grooves and hollowed-out bottoms. This design serves two purposes: firstly, it can store oil for lubrication; secondly, the raised ribs have a certain degree of elasticity, allowing the inner tube 5 of the column to better fit with the middle tube 12 of the column, and the middle tube 12 of the column to better fit with the outer tube 13 of the column. This compensates for errors in the tube fitting and makes tables and other items with the lifter installed more stable. In traditional lifting devices, there is a gap between the inner tube 5 of the column and the intermediate tube 12 of the column. A friction block needs to be installed between these two tubes to improve their stability and prevent wobbling during movement. However, due to variations in the production process of different batches of metal tubes, the thickness of the friction block needs to be adjusted according to the gap between the inner tube 5 and the intermediate tube 12 to ensure proper operation. Since the friction block is typically injection molded, producing different thicknesses requires re-molding, increasing production costs and reducing efficiency. The rib structure in this invention, such as the inner tube of the column… The first protruding rib 42 between the column 5 and the column intermediate tube 12 is fixed to the column inner tube 5 by the column inner tube fixing sleeve 4. The end of the first protruding rib 42 contacts the inner wall of the column intermediate tube 12 (the distance of the first protruding rib 42 is set according to the maximum possible gap between the column inner tube 5 and the column intermediate tube 12). Since the first protruding rib 42 is provided with a first through groove 43, when the column intermediate tube 12 is too small, the first protruding rib 42 will undergo slight deformation after being squeezed by the inner wall of the column intermediate tube 12, reducing the distance of the first protruding rib 42 protruding, ensuring that the first protruding rib 42 still fits with the inner wall of the column intermediate tube 12, without the need to change the size of the parts, saving production costs and improving production efficiency.

[0072] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A three-section electric column lifter, comprising an inner column tube (5), a middle column tube (12), and an outer column tube (13), and a rotary lifting mechanism connecting the inner column tube (5), the middle column tube (12), and the outer column tube (13), characterized in that, The rotary lifting mechanism is used to convert circumferential rotation into axial movement. The rotary lifting mechanism drives the inner tube (5) and the middle tube (12) of the column to move along the axis of the outer tube (13) of the column. A column inner tube fixing sleeve (4) is provided between the rotary lifting mechanism and the inner tube (5). The column inner tube (5) is circumferentially fixed by the column inner tube fixing sleeve (4), which restricts the relative circumferential rotation between the column inner tube (5) and the rotary lifting mechanism. A column middle tube fixing sleeve (11) is provided between the rotary lifting mechanism and the middle tube (12). The column middle tube (12) is circumferentially and axially fixed by the column middle tube fixing sleeve (11), which restricts the relative circumferential rotation between the column middle tube (12) and the rotary lifting mechanism, and makes the column middle tube (12) move synchronously with the rotary lifting mechanism. The column inner tube fixing sleeve (4) includes a first base plate and a first sleeve. The first base plate and the first sleeve are integrally formed. A first locking block (41) is provided on the outer wall of the first sleeve. A first locking groove adapted to the first locking block (41) is provided at the lower end of the column inner tube (5). The axial movement of the column inner tube (5) relative to the column inner tube fixing sleeve (4) is restricted by the cooperation of the first locking block (41), the first base plate and the first locking groove. A first boss (44) is provided at the edge of the upper surface of the first base plate. A first limiting groove adapted to the first boss (44) is provided at the lower end of the column inner tube (5). The circumferential movement of the column inner tube (5) relative to the column inner tube fixing sleeve (4) is restricted by the cooperation of the first boss (44) and the first limiting groove. A first through hole adapted to the outer wall of the rotary lifting mechanism is provided on the first base plate. The circumferential movement of the column inner tube fixing sleeve (4) relative to the rotary lifting mechanism is restricted by the first through hole. The column intermediate tube fixing sleeve (11) includes a second base plate, a second sleeve, and a third sleeve, which are integrally formed. A second locking block (111) is provided on the outer wall of the second sleeve, and a third locking block (114) is provided on the inner wall of the third sleeve. A second through hole for the rotating lifting mechanism to pass through is provided on the second base plate. A second slot adapted to the second locking block (111) is provided at the lower end of the column intermediate tube (12). The axial movement of the column intermediate tube (12) relative to the column intermediate tube fixing sleeve (11) is restricted by the cooperation of the second locking block (111), the second base plate, and the second slot. The second boss (115) is provided, and the lower end of the column intermediate tube (12) is provided with a second limiting groove adapted to the second boss (115). The second boss (115) and the second limiting groove cooperate to restrict the circumferential movement of the column intermediate tube (12) relative to the column intermediate tube fixing sleeve (11). The lower end of the outer wall of the rotating lifting mechanism is provided with a third slot adapted to the third card block (114). The third card block (114), the second base plate and the third slot cooperate to restrict the axial movement of the column intermediate tube fixing sleeve (11) relative to the rotating lifting mechanism. The second through hole restricts the circumferential movement of the column intermediate tube fixing sleeve (11) relative to the rotating lifting mechanism. The outer wall of the first sleeve is provided with a uniformly distributed first rib (42), the first rib (42) is parallel to the axis of the first sleeve, and the lower end of the inner tube (5) of the column is provided with a first notch for the first rib (42) to pass through. The free end of the first rib (42) passes through the first notch and contacts the inner wall of the middle tube (12) of the column. The outer wall of the second sleeve is provided with evenly distributed second ribs (112), the second ribs (112) are parallel to the axis of the second sleeve, and the lower end of the column middle tube (12) is provided with a second notch for the second ribs (112) to pass through. The free end of the second ribs (112) passes through the second notch and contacts the inner wall of the column outer tube (13). The inner tube fixing sleeve (4) of the column is provided with a first through groove (43) that passes through the first sleeve and the first rib (42); the middle tube fixing sleeve (11) of the column is provided with a second through groove (113) that passes through the second sleeve and the second rib (112).

2. The circular three-section electric column lifter according to claim 1, characterized in that, The rotary lifting mechanism includes a lead screw (1), a lead screw nut (2), a lifting device outer tube (3), a hollow lead screw (6), a hollow lead screw nut (7), and a hollow lead screw outer tube (8). The lead screw (1) is coaxially arranged with the inner tube of the column (5). The upper end of the lead screw (1) extends to the outside of the inner tube of the column (5). A lead screw limiting mechanism is installed at the upper end of the inner tube of the column (5). The lead screw limiting mechanism allows the lead screw (1) to rotate only along the axis of the inner tube of the column (5). A lead screw nut (2) that cooperates with the lead screw (1) is installed on the inner wall of the upper end of the lifting device outer tube (3). A lead screw guide sleeve (17) is fixedly installed at the lowermost end of the lead screw (1). 17) The hollow screw (6) is matched with the inner wall of the hollow screw (6) and the hollow screw (6) is driven to rotate synchronously through the screw guide sleeve (17). The lower end of the hollow screw (6) is equipped with a hollow screw guide sleeve (9). The outer wall of the hollow screw guide sleeve (9) is matched with the inner wall of the hollow screw outer tube (8). The upper end of the hollow screw outer tube (8) is fixedly installed with a hollow screw nut (7) that matches the hollow screw (6). The lower end of the hollow screw outer tube (8) is fixedly connected to the column outer tube (13). The outer wall of the hollow screw nut (7) is matched with the inner wall of the lifting device outer tube (3). The hollow screw nut (7) restricts the lifting device outer tube (3) from rotating circumferentially. The third slot is located on the outer tube (3) of the elevator.

3. The circular three-section electric column lifter according to claim 2, characterized in that, The hollow lead screw (6) has uniformly distributed grooves along its axial direction on its inner wall, and the lead screw guide sleeve (17) has a slider on its side wall, which is adapted to the groove.

4. The circular three-section electric column lifter according to claim 2, characterized in that, The lower end of the inner wall of the column outer tube (13) is welded with an outer tube gasket (18), and the outer tube gasket (18) is fixedly connected to the lower end of the hollow screw outer tube (8) through a tube plug (10). The lead screw limiting mechanism is a square box (14) set at the top of the inner tube (5) of the column. The upper end of the lead screw (1) extends into the inside of the square box (14), and a lead screw bearing adapted to the lead screw (1) is installed on the square box (14).

5. The circular three-section electric column lifter according to claim 2, characterized in that, The lower end of the lead screw nut (2) is fitted with a clamping plate (20) by screws. A hollow lead screw nut bearing (19) is installed between the clamping plate (20) and the lead screw nut (2). The outer ring of the hollow lead screw nut bearing (19) is clamped between the clamping plate (20) and the lead screw nut (2). The inner ring of the hollow lead screw nut bearing (19) is fixedly connected to the hollow lead screw (6).

6. The circular three-section electric column lifter according to any one of claims 1-5, characterized in that, The top end of the column intermediate tube (12) is equipped with a column intermediate tube guide sleeve (15), the inner wall of the column intermediate tube guide sleeve (15) is adapted to the outer wall of the column inner tube (5), and the top end of the column outer tube (13) is equipped with a column outer tube guide sleeve (16), the inner wall of the column outer tube guide sleeve (16) is adapted to the outer wall of the column intermediate tube (12). Both the column intermediate tube guide sleeve (15) and the column outer tube guide sleeve (16) are provided with evenly distributed guide mechanisms (21). The guide mechanism (21) on the column intermediate tube guide sleeve (15) is adapted to the outer wall of the column inner tube (5), and the guide mechanism (21) on the column outer tube guide sleeve (16) is adapted to the outer wall of the column intermediate tube (12). The guiding mechanism (21) includes a guide block (211) and a guide block mounting plate (212). The end face of the guide block (211) is adapted to the inner wall of the inner tube (5) of the column or the inner wall of the guide sleeve (15) of the middle tube of the column. The internal structure is provided with two corresponding springs (216). The axis of the springs (216) is perpendicular to the axis of the column middle tube guide sleeve (15). The guide block (211) also has two corresponding columnar cavities (215) inside. The columnar cavities (215) are located inside the springs (216). The column middle tube guide sleeve (15) and the column outer tube guide sleeve (16) are both provided with sliding grooves that are adapted to the guide block mounting plate (212). The guide block mounting plate (212) can slide along the radial direction of the column middle tube guide sleeve (15) or the radial direction of the column outer tube guide sleeve (16) through the sliding grooves. An elastic block (214) is fixedly installed on the end face of the guide block mounting plate (212) away from the guide block (211). The column middle tube (12) and the column outer tube (13) are both provided with elastic block mounting grooves that are adapted to the elastic block (214).

7. The circular three-section electric column lifter according to claim 6, characterized in that, A plug (213) is provided on the guide block (211) in the area between the columnar cavities (215). The plug (213) is sealed to the guide block (211). The end of the plug (213) is fixedly connected to the guide block mounting plate (212). The inside of the columnar cavity (215) is a vacuum.

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